US20110047915A1 - Clamp for fastening concrete rebar intersections - Google Patents
Clamp for fastening concrete rebar intersections Download PDFInfo
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- US20110047915A1 US20110047915A1 US12/583,935 US58393509A US2011047915A1 US 20110047915 A1 US20110047915 A1 US 20110047915A1 US 58393509 A US58393509 A US 58393509A US 2011047915 A1 US2011047915 A1 US 2011047915A1
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- Prior art keywords
- rod
- seating surface
- retainer
- longitudinal
- retainers
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
- E04C5/20—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups of material other than metal or with only additional metal parts, e.g. concrete or plastics spacers with metal binding wires
- E04C5/201—Spacer blocks with embedded separate holding wire or clips
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
- E04C2/02—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials
- E04C2/04—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of concrete or other stone-like material; of asbestos cement; of cement and other mineral fibres
- E04C2/06—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of concrete or other stone-like material; of asbestos cement; of cement and other mineral fibres reinforced
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
- E04C5/162—Connectors or means for connecting parts for reinforcements
- E04C5/166—Connectors or means for connecting parts for reinforcements the reinforcements running in different directions
- E04C5/167—Connection by means of clips or other resilient elements
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
- E04C5/168—Spacers connecting parts for reinforcements and spacing the reinforcements from the form
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- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Clamps And Clips (AREA)
Abstract
A structure for clamping two rods mutually transverse to one another is described. An upwardly open seating surface has a longitudinal direction for rotationally vertically receiving a first rod in the longitudinal direction. A pair of side opening rod retainers are supported above and on opposite sides of the upwardly open longitudinal seating surface. The side openings of the retainers open in opposite directions for rotationally laterally receiving opposite sides of a second rod along a direction transverse to the longitudinal direction. The retainers include top portions spaced from the lower seating surface a distance effective to cause a rod rotationally laterally received in the side openings to exert a compressive force against a rod rotationally vertically received on the lower seating surface, thereby clamping the rods mutually transversely to each other. The clamping structure may be rotated into the intersection to vertically receive the first rod in the longitudinal seat and to laterally receive opposite sides of the second rod under the top retainer portions to press the second rod forcibly against the first rod in the longitudinal seat. Using the clamping structure in the form of a chair, a mat is formed using the chairs to transversely clamp a plurality of first and second rods at right angles, concrete is poured on the mat supported over a pour surface by the chairs, and a reinforced concrete slab is formed in which the mat is positioned at a predetermined position internally in the slab.
Description
- Not Applicable
- Not Applicable.
- This disclosure relates to static structures which engage and support elongated reinforcing bars for embedding in a hardening material such as concrete, and in a particular to rebar support chairs and clips for crossed reinforcing bars.
- Elongated reinforcing steel bars or rods (“rebar”) crossed and connected to form a horizontal grid or mat are used in the construction of poured concrete structures, such as foundation slabs, roadways, side walks, tilt up building walls and the like, to prevent the hardened concrete from separating along crack lines caused by the curing process, from load induced stress, from weather conditions, and from other causes. The rebar grid or mat holds the cracks tight, facilitates load transfer across the cracks, and restrains end movement, providing stiffness. For length, width, thickness (height) and intended use of each concrete structure, engineers determine, inter alia (i) the optimum spacing separating longitudinal bars laid out in parallel across bars laid perpendicularly to the length of the structure (cross or “transverse”) bars, (ii) the optimal spacing separating transverse bars, and (iii) the optimum height of a grid of transverse bars and longitudinal bars within a concrete form and within the formed concrete solid, all so the rebar mat functions correctly for its design purposes. In order for transverse and longitudinal reinforcing steel to effectively perform their engineered function, the rebar mat must be elevated to the design height above the pour surface before the pour, and the reinforcing steel must remain at its correct height, spacing and shape within the pour and after the pour. It is thus necessary to prevent movement of the reinforcing bars and the mat of bars during the pour.
- For pours on a horizontal surface such as a roadway, the traditional method is to erect the mat in place, and then prop the mat to the design height above the pour surface. To do this, one of the lengths of rebar steel, for example the transverse rebar, is laid out on the pour surface at the specified intervals. Other lengths of rebar, in this example, longitudinal rebar, is then laid out on top of the transverse bars, and these transverse and longitudinal bars are wire tied together to form a template for the completed mat. Then the template rebar is lifted up, and supports for the template, colloquially called “chairs”, are placed under the lower bars, in the example, transverse bars, at the ends of the bars and at locations between the ends of the bars in a number sufficient to support the weight of the steel mat when it is completed, in the example, by adding remaining longitudinal rods at the design spacing and wire tying them to the transverse bars.
- Plastic chairs have been developed in recent years with the goal of eliminating the need to wire tie the intersections where the chair is placed. The typical chair includes an openwardly open lower rod support for receiving a first rebar lowered into it (a “bottom bar”), and above it, at the sides of the rod support, either hook members opening in the same direction for orthogonally receiving a second rebar (a “top bar”) from one side (e.g., U.S. Pat. No. 3,673,753, Anderson), or upwardly open receivers higher than the rod support for orthogonally receiving a top bar lowered into the receivers to rest above the bottom bar. The higher upwardly open receivers generally have some means for restraining dislodgment of the top bar. Examples of the upwardly open rebar receivers include U.S. Pat. Nos. 5,893,252, 6,112,494 and 6,837,017 issued to Applicants, and U.S. Pat. Nos. 6,276,108 (Padrun), 6,557,317 (Sorkin), 6,684,595 (Sorkin), 6,962,029 (Lowrey), 7,322,158 (Sorkin), and 7,461,491 (Sorkin). These chairs position separate bottom bars and top bars in place orthogonally.
- Other chairs have been described for attaching to already united crossed wires (welded wire mesh) to stand the mesh a planned distance from a pour surface: U.S. Pat. Nos. 3,378,981 (Horne) and 6,212,848 (Cooper) and International Patent Application PCT/US99/10962 (Nicol).
- Cement pours are also made within upright forms to form a vertical structure, such as a barrier. A traditional method for erecting a vertical rebar mat is to cross the rebar lengths and wire tie them together at their intersections, a tedious process. Plastic clips have been described for connecting rebar. Same side opening plastic clips have been used to join rebar longitudinally (U.S. Pat. No. 4,617,775—Padrun) or at intersections: U.S. Pat. No. 3,694,988 (Skold), U.S. Pat. No. 4,110,951 (Padrun), U.S. Pat. No. 7,469,515 (Minor). Orthogonal clips have been used to join rebar: U.S. Pat. No. 5,371,991 (Bechtel et al.), U.S. Pat. No. 5,878,546 (Westover). Stirrup clips have been described for replacing wire ties for rebar runs at the corners of wire stirrups (U.S. Pat. No. 4,900,184, Cleveland).
- The present invention is directed to a clamping structure for fastening separate concrete reinforcing rods together to form a clamped intersection. The invention is useful for clamping together rods crossing in adjacent horizontal planes and for clamping together bars crossing in adjacent vertical planes. The clamping structure may comprise a support (chair) or a free standing clip.
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FIG. 1 is an isometric view of a chair clamp embodiment of this invention. -
FIG. 2 is a top view of the chair ofFIG. 1 , showing by dashed lines bars captured mutually perpendicularly in the chair clamp. -
FIG. 3 . is a side view of the chair ofFIG. 1 along the direction of axis Y. -
FIG. 4 . is a side view of the chair ofFIG. 1 along the direction of axis “X”. -
FIG. 5 . is an isometric view of another chair embodiment of this invention. -
FIG. 6 . is a side view of the chair ofFIG. 5 along the direction of axis “X”. -
FIG. 7 is the same asFIG. 1 showing positioning of the chair below crossed bars indicating movement of the chair upwardly to engage the lower of the crossed bars. -
FIG. 8 a is a top view of the chair ofFIG. 1 engaged with the lower of the crossed bars ready for rotational movement to capture the bars, the arrows indicating a direction of rotation. -
FIG. 8 b is a top view of the chair ofFIG. 1 engaged with the lower of the crossed bars rotated in the direction of the arrows and entering engagement with the upper of the crossed bars. -
FIG. 8 c is a top view of the chair ofFIG. 1 showing the crossed bars ofFIGS. 6 a and 6 b captured in the chair. -
FIG. 9 is an isometric view of an assembly of the chair ofFIG. 1 and crossed rods. -
FIG. 10 is an isometric view of a mat of intersecting longitudinal reinforced rods supported and held in mutually perpendicular arrangement by chairs of the embodiment depicted inFIG. 1 , embedded within a slab of concrete. -
FIG. 11 Is an isometric view of a clip clamp embodiment of this invention. -
FIG. 12 is a side view of the clamp ofFIG. 5 along the direction of axis “X”. -
FIG. 13 is an isometric view of an assembly of the clamp ofFIG. 11 clamping crossed rods. - In the following detailed description of embodiments, reference is made to the accompanying drawings, which form a part hereof and in which are shown, by way of illustration, specific embodiments in which the invention may be practiced. Specific details disclosed herein, including what is described in the Abstract, are in every case a non-limiting description and embodiment representing concrete ways in which the concepts of the invention may be practiced. This serves to teach one skilled in the art to employ the present invention in virtually any appropriately detailed system, structure or manner consistent with those concepts. It will be seen that various changes and alternatives to the specific described embodiments and the details of those embodiments may be made within the scope of the invention. It will be appreciated that one or more of the elements depicted in the drawings can also be implemented in a more separated or integrated manner, or even removed or rendered as inoperable in certain cases, as is useful in accordance with a particular application. Because many varying and different embodiments may be made within the scope of the inventive concepts herein described and in the specific embodiments herein detailed, it is to be understood that the details herein are to be interpreted as illustrative and not as limiting.
- Reference throughout this specification to “one embodiment”, “an embodiment”, or “a specific embodiment” means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of phrases such as “in one embodiment”, “in an embodiment”, or “in a specific embodiment” in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
- The concepts embodied in the embodiments described herein have application to any system in which rods need to be clamped together in a mutually transverse arrangement to fix the rods in a clamped intersection. The terms “rod”, “bar” and “rebar” are used interchangeably herein.
- The various directions such as “upper,” “lower,” “bottom,” “top,” “back,” “front,” “transverse,” “perpendicular”, “vertical”, “horizontal,” “length,” “width, “downwardly”, “laterally” and so forth used in the detailed description of embodiments are made only for easier explanation in conjunction with the drawings. The components may be oriented differently while performing the same function and accomplishing the same result as the embodiments herein detailed embody the concepts of the invention, and such terminologies are not to be understood as limiting the concepts which the embodiments exemplify.
- The term “transversely” means at a crossing angle, which is not necessarily but may be a perpendicular angle. The terms “orthogonally” or “perpendicularly” means substantially at a right angle to a reference to a degree that if not absolutely a right angle will not materially adversely affect the arrangement and function of the element described as perpendicular. The terms “vertical” or “vertically” include but are not limited to literal vertical and generally mean oriented up and down with respect to the earth's horizon to a degree that if not absolutely vertical will not materially adversely affect the function of the element described as vertical. Similarly, the terms “horizontal” or “horizontally” include but are not limited to literal horizontal and generally mean not out of level with respect to the earth's horizon to a degree that will materially adversely affect the function of the element described as horizontal. “Downwardly,” “upwardly” and “laterally” have their normal meanings; i.e., “downwardly” means: toward a lower place, point or level; “upwardly” means: toward a higher place, point or level; and “laterally” means: of, at, toward, or from the side or sides. When the term “vertically” is used in the phrase “rotationally vertically received” with regard to a rod, it is meant that where the rod is disposed in a generally horizontal plane, the rod is received by an upwardly generally horizontal movement of a structure receiving the rod or a downwardly horizontal movement of the rod with respect to the receiving structure.
- As used herein, the use of the word “a” or “an” when used in conjunction with the term “comprising” (or the synonymous “having” or “including”) in the claims and/or the specification may mean “one,” but it is also consistent with the meaning of “one or more,” “at least one,” and “one or more than one.” In addition, as used herein, the phrase “connected to” means joined to or placed into communication with, either directly or through intermediate components.
- Certain embodiments are disclosed for a chair structure for clamping two rods mutually transverse to one another above a pour surface. In these embodiments, the chair comprises a support; an upwardly open seating surface supported by the support and having a longitudinal direction for rotationally vertically receiving a first rod in the longitudinal direction; and a pair of side opening rod retainers each supported by the support above and on opposite sides of the upwardly open longitudinal seating surface, the side openings of the retainers opening in opposite directions for rotationally laterally receiving opposite sides of a second rod along a direction transverse to the longitudinal direction, the retainers each including a top portion spaced from the lower seating surface a distance effective to cause a second rod rotationally laterally received in the side openings to exert a compressive force against a first rod rotationally vertically received on the lower seating surface, thereby clamping the two rods mutually transversely to each other.
- In an embodiment of the invention, and referring to
FIGS. 1-4 and 7-9 for illustrations, achair structure 10 for clamping tworods support 11, suitably comprising abase 12 andpedestal 13, and an upwardly openlower seating surface 24 supported bysupport 11 and having alongitudinal direction 26. The upwardly open lower seating surface may have any generally upwardly open shape, as for non-limiting example, a hollow or rod support. - In the chair, a pair of side opening
rod retainers support 11 above and on opposite sides of upwardlyopen seating surface 24. Each side opening retainer comprises a vertical shank portion (15 inretainer shank portion 15, it istop portion 17, forshank portion 19, it istop portion 21. The term “retainer” is used without regard to configuration other than an upright shank portion and a top portion extending outwardly from the shank to cap a side opening. For non-limiting example, retainers can take the shape of an inverted “L”, a sideways “J”, a “C”, or a “G.” All these shapes are side opening and all have a vertical shank (15 inretainer shank portion FIGS. 1-4 , 7-13) or a sideways “J” (FIGS. 5-6 ) is depicted, namely a side opening having an bowed shape for the shank. While these are the side opening modes illustrated, the scope of the invention is not limited to the bowed shaped of the side opening. - Whether the retainers take the general shape of a sideways “J”, an inverted “L”, a “C” or a “G”, the side openings bounded by the shanks and top portions face in opposite directions for rotationally laterally receiving opposite sides of a
rod 200 in them.Vertical shank portions FIG. 1-6 and 94 a, 94 b inFIGS. 11-13 ).Top portions longitudinal direction 26. In other words,retainer 48 is open on the side of thevertical shank 15 in the direction pointed by thetop portion 17 ofretainer 48, andretainer 66 is open on the side of thevertical shank 19 in the direction pointed by thetop portion 21 ofretainer 66.Top portions - Each
retainer rod 200 under their respective outwardly extendingtop portions longitudinal direction 26.Shank 15 ofretainer 48 blocks lateral movement of arod 200 rotationally received under outwardly extendingtop portion 17 except in the direction in whichtop portion 17 extends.Shank 19 ofretainer 66 blocks lateral movement of arod 200 rotationally received under outwardly extendingtop portions 21 except in the direction in whichtop portions 21 extends. Each retainer (48 or 66) is spaced from the other retainer (66 or 48) on opposite sides of the lowerlongitudinal seating surface 24 with thetop portions rod 200 rotationally laterally received under thetop portions rod 100 rotationally vertically received on thelower seating surface 24, thereby clamping the rods mutually transversely to each other. This spacing locks therods upper rod 200 from being displaced laterally fromretainers - In one embodiment, the
shanks retainers recesses retainers longitudinal direction 26 of theseating surface 24 and is spaced above surface 24 a distance effective to cause arod 200 rotationally laterally received inretainers rod 100 rotationally vertically received on thelower seating surface 24. In the embodiments illustrated inFIGS. 1-13 , axis “Y” occupies thelongitudinal direction 26. Axis “X” is perpendicular to axis “Y”. An additional axis, axis “Z” (indicated by reference numeral 96) is centered on the union in the embodiments ofFIGS. 1-9 where thepedestal legs FIGS. 11-13 , axis “Z” is centered where the cross members 91, 92 unite. Axes “X”, “Y” and “Z” are mutually perpendicular to one another. - In another embodiment, as in
FIGS. 5 and 6 , theretainer shanks shank shanks top portion - In the embodiments of
FIGS. 1-4 , 7-9 and 11-13, additional basal structure is provided to the shank and top extension of the retainers by forming the retainer in a general “C” shape. The additional basal structure assists in retainingrod 200 in place. More particularly, in the embodiments depicted inFIGS. 1-4 and 7-9, theretainers retainers rod 200 rotationally laterally received in the retainers, the basal seating surface of the retainers having an elevation above thelower seating surface 24 effective to cause the compressive force against arod 100 rotationally received in the lower seating surface. - In a shorthand rendition, the general form of the
retainers FIGS. 1-4 , 7-9 and 11-13) sometimes is herein called a “C-clip.” The term “C-clip” is intended also to include a “C” shape with the additional structure of an inwardly deflectable resilient member disposed at the end portion of the top or base of the opening (giving a generally inverted “G” shape or a general “G” shape, respectively) to deflect for entrance ofrod 200 and spring back to press laterally againstrod 200 and provide additional retention structure for holdingtransverse bar 200 in the retainer. - There is provided in an embodiment a chair structure for clamping two rods mutually transverse to one another in which the upwardly facing seating surface includes sides. In this embodiment, the chair comprises a longitudinal seat having a first seating surface between seat sides. The seat is oriented in a first direction for longitudinally rotationally vertically receiving and seating a first rod inside the sides. The chair includes first and second resilient retainers each comprising a recess about a common axis transverse to the first direction. The recesses have side openings oppositely facing in the first direction. The retainers are spaced apart along the mentioned axis above and to the sides of the longitudinal seat. The recesses each have a second seating surface for seating a second rod rotationally laterally received in the recess and an opposite top surface for pressing the second rod against the second seating surface. A deepest portion of the second seating surfaces of the recesses is spaced from a deepest portion of the first seating surface a distance equal to or less than the thickness of the first rod.
- The foregoing aspects of an embodiment are now described in greater detail with respect to
FIGS. 1-4 and 7-9, in which an intersectional rod support orchair 10 is depicted, suitably constructed of relatively resilient plastic material, for clamping two rods mutually transverse to one another (seeFIG. 9 ) a predetermined distance above a pour surface such as a foundation or fabricated form on which thechair 10 may stand.Chair 10 comprises abase 12 andpedestal 13 comprising fourlegs base 10.Legs legs legs Second pair first pair First leg 14 ofpair first segment 22 of a upwardly openlongitudinal seat 24 oriented in afirst direction 26.Segment 22 has a firstsingle side 28 and an interiorbottom seating surface 30 for rotationally vertically receiving and seating a first portion of afirst rod 100 infirst direction 26.First rod 100 is sometimes referred to herein as lower orbottom rod 100.Second leg 16 ofpair second segment 32 of seat orbottom rod support 24.Second segment 32 has a secondsingle side 34 and an interiorbottom seating surface 36 for rotationally vertically receiving a second portion of the first rod in the first direction. First andsecond segments juncture 38 where bottom surfaces 30, 36 merge,segments first direction 26. Seat sides 28, 34 each have a runner, respectively 40, 42, that slopes atrespective chamfers sides seat segments -
Leg 18 of pedestalsecond pair resilient rod retainer 48 above and laterallyadjacent runner 40 andsingle side 28 offirst segment 22 ofbottom rod support 24.Rod retainer 48 compriseslower jaw 47 andupper jaw 49. Aninterior side 45 oflower jaw 47 isadjacent runner 40.First rod retainer 48 includes afirst recess 50 with surfaces about an axis “X” transverse tofirst direction 26 axis “Y.” The surfaces of thefirst recess 50 include alower seating surface 52 on the topside oflower jaw 47 for seating a first portion of asecond rod 200 rotationally laterally received infirst recess 50 and anupper surface 54 on the underside ofupper jaw 49 for pressing the first portion ofsecond rod 200 againstlower seating surface 52 offirst recess 50.Second rod 200 is sometimes referred to herein as upper ortop rod 200. The bottom 56 oflower seating surface 52 is a predetermined distance higher than thebottom surface bottom rod support 24. That predetermined distance is a distance equal to or less than the thickness of first orlower rod 100 and will vary according to the planned application for the chair. For example, in a road construction of 6-8 inches concrete depth, the centerlines for a mat of the rods would be about 3 inches. Lower or transverse rod may be ½ inch thick (½ inch diameter if the rod is round, as in most instance of rebar rods, it is) so the low point of the mat would be 2.5 inches above the pour surface and the high point of the mat would be 3.5 inches above the pour surface. For an application such as a tilt up wall, the pour height is typically less high and smaller transverse rods are used, for example, ⅜ inch thickness. - A
first ramp 58 comprising an upper part ofpedestal leg 18 slopes vertically from adjacent theinterior side 45 offirst rod retainer 48 towardjuncture 38 of longitudinalbottom rod support 24.First ramp 60 suitably has substantially the same slope aschamfer 44. -
First rod retainer 48 has upper and lower projections ordetents FIG. 3 ) ofrecess 50 for laterally retaining the first portion ofsecond rod 200 withinfirst rod retainer 48. Aweb 51 interconnects members 53, 55 ofupper jaw 49 to provide additional structural rigidity. -
Second leg 20 ofsecond pair resilient rod retainer 66 spaced fromfirst rod retainer 48 above and adjacent therunner 42 andsingle side 34 of thesecond segment 32 ofbottom rod support 24 and longitudinally spaced from but opposite thesingle side 28 offirst segment 22.Rod retainer 66 compriseslower jaw 65 andupper jaw 67. Aninterior side 69 ofrod retainer 66 isadjacent runner 42.Second rod retainer 66 has the same configuration asfirst rod retainer 48, and comprises asecond recess 68 with surfaces about axis “X” common tofirst recess 50. The surfaces ofsecond recess 68 include alower seating surface 70 for seating a second portion of the second orupper rod 200 rotationally laterally received insecond recess 68 and anupper surface 72 for pressing the second portion ofupper rod 200 againstseating surface 70. The same as forfirst rod retainer 48, the bottom 74 oflower seating surface 70 ofsecond recess 68 is a predetermined distance higher than thebottom surface bottom rod support 24 equal to or less than the thickness offirst rod 100. Similarly,second rod retainer 66 has upper and lower projections ordetents side opening 80 ofsecond recess 68 for laterally retaining the second portion of thesecond rod 200 withinsecond rod retainer 66. Aweb 57 interconnects members 59, 61 ofupper jaw 67 to provide additional structural rigidity. - A
second ramp 82 comprising an upper part ofpedestal leg 20 slopes vertically from adjacent theinterior side 69 ofsecond rod retainer 66 towardjuncture 38 of longitudinalbottom rod support 24.Second ramp 82 suitably has substantially the same slope aschamfer 46. - A realization of the invention includes a methodology for clamping two rods transversely together. The method comprises (a) placing a second rod transversely against a first rod to form an intersection; (b) placing a rod support structure adjacent said intersection, the rod support structure comprising a support, an upwardly open lower seating surface supported by the support and having a longitudinal direction, the structure further having a pair of side opening rod retainers supported by the support above and on opposite sides of the upwardly open longitudinal seating surface, the side openings of the retainers opening in opposite directions for rotationally laterally receiving opposite sides of a second rod along a direction transverse to the longitudinal direction, the retainers including a top portion spaced from the lower seating surface a distance effective to cause a rod rotationally laterally received in the side opening to exert a compressive force against a rod rotationally vertically received on the lower seating surface, thereby clamping the rods mutually transversely to each other; and (c) rotating the structure into the intersection to vertically receive the first rod in the longitudinal seat and to laterally receive opposite sides of the second rod under the top retainer portions to press the second rod forcibly against the first rod in the longitudinal seat, clamping the two rods together.
- This method is now more particularly described in respect to the rod support embodiments of
FIGS. 1-4 and in which reference is made toFIGS. 7-9 to illustrate the method. - Referring to those figures,
side openings second recesses second retainers FIGS. 1 and 7 are viewed) and therecess 68 facing and opening to the “north” (arbitrarily assigning “north” to the right asFIGS. 1 and 7 are viewed). First, an intersection of first andsecond rods recess side openings oppositely facing retainers chair 10 to be positioned and raised under the intersection of first andsecond rods arrows FIG. 5 . Referring toFIGS. 8 a, 8 b, and 8 c, and as indicated byFIG. 7 andFIG. 8 a, aschair 10 is raised under an intersection ofrods chair 10 is rotated about the “Z” axis in the direction of arrow 86 (counterclockwise) and comes into contact first withrod 100 atramps lower jaws retainers FIG. 8 b, aschair 10 comes into contact withramps chair 10 continues being rotated about the “Z” axis counter-clockwise in the direction indicated byarrow 86,detent 60 offirst rod retainer 48 anddetent 76 ofsecond rod retainer 66 are rotated overupper rod 200 anddetents rod 200, forcing upper andlower jaws first rod retainer 48 apart, and similarly, forcing upper andlower jaws second rod retainer 66 apart. This same rotation moveslower rod 100 down ramps 58, 82 and closer to alignment withbottom rod support 24. Further counter-clockwise rotation ofchair 100 in the direction ofarrow 86 pressesupper rod 200 throughdetents first rod retainer 48 anddetents second rod retainer 66 intorecesses seating surface bottoms lower rod 100 withbottom rod support 24 into whichlower rod 100 is pressed by the force ofupper rod 200 acting on it. Because the bottom seating surfaces ofretainers bottom rod support 24 only a distance equal to or less than the thickness of saidlower rod 100 and becauseupper surfaces upper jaws second rod 200 against lower seating surfaces 52, 70 of first andsecond recesses chair 10 into the intersection ofrods upper rod 200 down ontolower rod 100, clampingrod 100 against its seating surfaces 30,36,top portions retainers rod 200 againstlower rod 100.Detents rod 200 laterally in place. An assembly of anupper rod 200, alower rod 100 and achair 10 is thus formed when therecesses chair 10, each respectively having anside opening upper rod 200. - As indicated above, another embodiment of a chair structure is depicted in
FIGS. 5 and 6 . The same reference numerals as used inFIGS. 1-4 and 7-9 are used inFIGS. 5 and 6 to indicate like structure. The embodiment depicted inFIGS. 5 , 6 is essentially the same as the one depicted inFIGS. 1-4 and 7-9, except the basal structure forward of seatingportion 56 inclusive oflower jaw 47 anddetent 62 ofretainer 48 and the basal structure forward of seatingportion 70 inclusive oflower jaw 65 anddetent 78 ofretainer 66 in the embodiment ofFIGS. 1-4 and 7-9 is absent. In this embodiment, eachretainer shank portion top portion top portion direction 26. Eachshank portion rod 200 under the outwardly extendingtop portions longitudinal direction 26 of upwardly openlower seating surface 24 supported bysupport 11. Eachshank rod 200 rotationally laterally received under thetop portions top portions retainer other retainer longitudinal seating surface 24 with thetop portions rod 200 rotationally laterally received under thetop portions rod 100 rotationally vertically received on thelower seating surface 24, clamping therods - Using
chair 10, a method is provided for assembling amat 300 of concrete reinforcement rods for a concrete pour, comprising (i) laying out a plurality of first orlower rods 100 spaced substantially parallel to one another in a first rod direction; (ii) laying out a plurality ofsecond rods 200 spaced substantially parallel to one another atop the first rods in a second rod direction transverse to the first rod direction, to provideintersections 350 of first andsecond rods chair 10 under anintersection 350 of afirst rod 100 and asecond rod 200 such that the longitudinalbottom rod support 24 is under thefirst rod 100, and raising and rotatingchair 10 to alignfirst rod 100 longitudinally with said longitudinalbottom rod support 24 and at the same time rotationally laterally receivesecond rod 200 through theside openings second retainers recesses second rod 200 down ontofirst rod 100 lodged inlongitudinal seat 24; and repeating step (iii) for a plurality of theintersections 350. - A method of constructing a
concrete slab 500 is provided usingchair 10, comprising (i) conducting the operations described in the next previous paragraph to construct amat 300 of intersectinglongitudinal rods intersections 350 ofrods 100, 200 a predetermined height above a poursurface 400 on which the slab is to be laid, using a plurality ofchairs 10; and (ii) laying a pour of concrete over the mat of locked intersections ofrods - Thus there is also provided a
concrete slab 500 having a top 502 and bottom 504 and comprising between top andbottom 502, 504 amat 300 of intersecting longitudinal reinforcedbars intersections 350 of which are locked a predetermined height above thesurface 400 andbottom 502 of theslab 500 by a plurality ofchairs 10. - The foregoing chair structures are useful where crossing rods are disposed in adjacent horizontal planes, as depicted in
FIG. 10 . In another embodiment of the invention, the same superstructure as used in the embodiments shown inFIGS. 1-4 and 7-9 is used without a pedestal and base and is useful for clamping rods in adjacent planes of any orientation from horizontal to vertical. This embodiment is shown inFIGS. 11 , 12 and 13,FIG. 13 showing the use of the structure to clamp two rods in adjacent vertical planes transversely together. Thus, referring toFIGS. 11 and 12 , and continuing use of the same reference numerals as inFIGS. 1-4 and 7-9 for identical structure, there is provided an embodiment of astructure 90 for clamping two rods mutually transversely to one another, comprising first cross members, 93 a, 93 b and second cross members, 94 a, 94 b.Cross members cross section members portions central union 96 along a first axis “Z” in the line ofunion 96. -
End portions seating surface 24 crossing atjuncture 38 over theunion 96 along a second axis “Y” perpendicular to the first axis “Z.” Seatingsurface 24 has at least on side portion, in the embodiment, aside portion 28 on one side ofjunction 38 above the line ofcross members union 96 and anotherside portion 34 on the other side of thejunction 38. Seatingsurface 24 also has abasal portion 30adjacent side portion 28 and abasal portion 36adjacent side portion 34.Basal portions FIGS. 11 and 12 ). -
End portions second cross members retainers seating surface 24.Retainer 48 has ashank portion 15 and atop portion 17 defining aside opening 64 undertop portion 17.Retainer 66 has ashank portion 19 and atop portion 21 defining aside opening 80 undertop portion 17.Side openings Side openings FIGS. 11 and 12 and to best advantage inFIG. 13 .Top portions retainers basal portions seating surface 24 by an extent effective to cause asecond rod 200 received inretainer openings first rod 100 received in theseating surface 24 upon rotation ofstructure 90 about the first axis (“Z”) to clamp the two transverse rods together, as seen inFIG. 13 . Theembodiment 90 ofFIGS. 11-13 is useful in clamping together crossing rods in any orientation. Thus structure 90 can clamp rods in adjacent vertical planes as well as rods in adjacent planes other than vertical planes.FIG. 13 depicts a first rod disposed vertically, and in an adjacent vertical plane, a second rod perpendicular to the first rod. - Use of embodiment 90 comprises: (a) placing a second rod 200 transversely against a first rod 100 to form an intersection; (b) placing clamping structure 90 adjacent the intersection, clamping structure 90 comprising first cross members 93 a, 93 b and second cross members 94 a, 94 b each extending transversely to one another to end portions from a central union 96 along a first axis “Z”, the end portions 95 a, 95 b of the first cross member supporting a seating surface 24 crossing over the union 96 along a second axis “Y” perpendicular to the first axis “Z”, the seating surface 24 having a basal portion 30 facing away from the union, the end portions 97 a, 97 b of the second cross member 94 a, 94 b supporting a pair of retainers 48, 66 separated from each other on opposite sides of the seating surface 24, each retainer 48, 66 having a shank portion (15 on retainer 48, 19 on retainer 68) and top portion (17 on retainer 48, 21 on retainer 66) defining a side opening (64 on retainer 48, 80 on retainer 68) under the respective top portions, the side openings 64, 80 being co-aligned along a third axis “X” that is perpendicular to the first and second axes (“Z” and “Y” respectively), the side openings 64, 70 facing opposite directions, the top portions 17, 21 of the retainers being spaced from the basal portion 30 of the seating surface 24 only to an extent effective to cause a second rod 200 received in the retainer openings 64, 80 upon rotation of structure 90 about first axis “Z” to press normally on first rod 100 received in the seating surface 24 upon the rotation to clamp the two rods 100, 200 transversely together at an intersection of the first, second and third axes, and (c) rotating the clamping structure 90 into the intersection to vertically receive the first rod 100 in the longitudinal seat 24 and to laterally receive opposite sides of the second rod 200 under the top retainer portions 17, 21 to press the second rod 200 forcibly against the first rod 100 in the longitudinal seat 24, clamping the two rods 100, 200 together.
- The above disclosed subject matter is to be considered illustrative, and not restrictive, and the appended claims are intended to cover all modifications, enhancements, and other embodiments that fall within the true scope of the present invention, which to the maximum extent allowed by law, is to be determined by the broadest permissible interpretation of the following claims and their equivalents, unrestricted or limited by the foregoing detailed descriptions of embodiments of the invention
Claims (18)
1. A structure for clamping two rods transversely to one another, comprising
a. first and second cross members each extending transversely to one another to end portions from a central union along a first axis,
b. the end portions of the first cross member supporting a seating surface crossing over the union along a second axis perpendicular to the first axis, said seating surface having a basal portion facing away from said union,
c. the end portions of the second cross member supporting a pair of retainers separated from each other on opposite sides of said seating surface, each retainer having a shank and top portion defining a side opening under the top portion, the side openings being co-aligned along a third axis that is perpendicular to said first and second axes, said side openings facing opposite directions, the top portion of the retainers being spaced from the basal portion of the seating surface only to an extent effective to cause a second rod received in said retainer openings upon rotation of said structure about said first axis to press normally on a first rod received in said seating surface upon said rotation to clamp the two rods transversely together at an intersection of said first, second and third axes.
2. A structure for clamping two rods mutually transverse to one another, comprising:
a. a support,
b. an upwardly open seating surface supported by said support, having a longitudinal direction for rotationally vertically receiving a first rod in said longitudinal direction, and
c. a pair of side opening rod retainers supported by said support above and on opposite sides of said upwardly open longitudinal seating surface, the side openings of said retainers opening in opposite directions for rotationally laterally receiving opposite sides of a second rod along a direction transverse to said longitudinal direction, said retainers including a top portion spaced from said lower seating surface a distance effective to cause a rod rotationally laterally received in said side opening to exert a compressive force against a rod rotationally vertically received on said lower seating surface, thereby clamping the rods mutually transversely to each other.
3. A chair structure for clamping two rods mutually transverse to one another above a pour surface, comprising:
a. a support including a base,
b. an upwardly open lower seating surface supported by said support and having a longitudinal direction, and
c. a pair of side opening rod retainers supported by said support above said lower longitudinal seating surface, each rod retainer comprising a raised shank portion terminating in a top portion extending outwardly in a direction opposite from the outwardly extending top portion of the other shank, each retainer being adapted to receive a rod under said outwardly extending top portions transverse to said longitudinal direction, each shank portion preventing lateral movement of a rod rotationally received under said top portions except in the outwardly extending direction of said top portions, each retainer being spaced from the other retainer on opposite sides of said lower longitudinal seating surface with said top portions spaced from said lower seating surface a distance effective to cause a rod rotationally laterally received under said top portions to exert a compressive force against a rod rotationally vertically received on said lower seating surface clamping the rods mutually transverse to each other.
4. The chair of claim 3 in which said retainers each arch about an included recess, each recess having an axis common to the other recess, said axis being transverse to said longitudinal direction of said seating surface and spaced above said surface a distance effective to cause a rod coaxially rotationally received in said retainers to exert a compressive force against a rod rotationally vertically received on said lower seating surface.
5. The chair structure of claim 4 in which said retainers each comprise a finger clip pointing in opposite directions.
6. The chair structure of claim 4 in which said retainers each comprise a C-clip centered on said axis, said retainers providing a basal seating surface for a rod rotationally received in said C-clip, said basal seating surface of said C-clip having an elevation above said lower seating surface effective to cause said compressive force against a rod rotationally received in said lower searing surface.
7. A structure for clamping two rods mutually transverse to one another, comprising:
a. a longitudinal seat having a first seating surface between seat sides and oriented in a first direction for vertically rotationally receiving and seating a first rod longitudinally inside said sides,
b. first and second resilient retainers each comprising a recess about a common axis transverse to said first direction, said recesses having oppositely facing side openings, said retainers being spaced apart along said axis above and to the sides of said longitudinal seat, said recesses each having a second seating surface for seating a second rod rotationally laterally received in the recess and an opposite surface for pressing the second rod against the second seating surface, a deepest portion of the second seating surfaces of the recesses being spaced from a deepest portion of said first seating surface a distance equal to or less than the thickness of said first rod.
8. The structure of claim 7 in which the longitudinal seat has a side laterally adjacent only the side opening of each retainer.
9. The structure of claim 8 in which said seat side has a top that slopes to the interior of the seat.
10. The structure of claim 9 further comprising a ramp sloping from a side of each said retainer laterally adjacent said longitudinal seat to said top of said side of said longitudinal seat.
11. The structure of claim 7 further comprising a base and a pedestal extending upwardly from said base, said pedestal supporting said longitudinal seat and said first and second retainers.
12. The chair of claim 7 in which said retainers each include upper and lower detents extending towards each other at the side opening of the recess of the respective retainers for laterally retaining said second rod within said retainers.
13. A chair body of relatively resilient plastic material for clamping two rods mutually transverse to one another a predetermined distance above a ground on which the chair sits, comprising:
a. a base;
b. four legs extending vertically from said base horizontally equidistantly spaced apart, a first pair of legs being horizontally spaced 180 degrees apart and a second pair of legs being horizontally spaced 180 degrees apart, said second pair extending vertically higher than said first pair, said first pair having:
i. a first leg supporting a first segment of a vertically open longitudinal rod support oriented in a first direction and having a first single side and an interior bottom surface for receiving a first portion of a first rod in said first direction, and
ii. a second leg supporting a second segment of a vertically open longitudinal rod support oriented in a first direction and having a second single side and an interior bottom surface for receiving a second portion of said first rod in said first direction, said first and second segments uniting in said bottom surface about a common axis, and
said second pair having:
iii. a first leg supporting a first resilient retainer above and to one side of said rod support, said first retainer comprising a first recess with surfaces about an axis transverse to said first direction, said surfaces of the first recess including a lower seating surface for seating a first portion of a second rod rotationally received in the first recess and an upper surface for pressing the first portion of the second rod against the seating surface of the first recess, with a bottom of the seating surface of the first recess supported a distance higher than said bottom surface of the rod support equal to or less than the thickness of said first rod, said first retainer having upper and lower projections extending toward each other at an side opening of the recess for laterally retaining said first portion of said second rod within said first retainer, and
iv. a second leg supporting a second resilient retainer spaced from said first retainer above and to a side of said rod support opposite said one side, said second retainer comprising a second recess with surfaces about a common axis to said first recess, said surfaces of said second recess including a lower seating surface for seating a second portion of said second rod rotationally received in the second recess and an upper surface for pressing the second portion of the second rod against the seating surface of the second recess, with a bottom of the seating surface of the second recess supported said distance higher than said bottom surface of the rod support, said second retainer having upper and lower projections extending toward each other at an side opening of the second recess for laterally retaining said second portion of said second rod within said second retainer,
said side openings of said first and second recesses oppositely facing in said first direction for rotationally laterally receiving opposite sides of said second rod and grippingly transversely clamping said second rod down onto said first rod, and
c. wherein said single sides of said first and second segments of said longitudinal seat are respectively adjacent the side openings of the first and second retainers, wherein each such seat side has a top that slopes to the interior of the seat, and wherein a ramp slopes from a side of each said retainer adjacent said longitudinal seat to said top of said single side of said longitudinal seat adjacent said side opening of said retainer.
14. An assembly comprising:
a. a base,
b. an upwardly open lower seating surface supported by said base and having a longitudinal direction,
c. a first longitudinal rod rotationally received in said longitudinal direction on said lower seating surface,
d. a pair of rod retainers supported by said base above said lower longitudinal seating surface, each rod retainer comprising a raised retainer terminating in a portion extending outwardly in a direction aligned in said longitudinal direction and opposite the direction of the outwardly extending portion of the other retainer,
e. a second rod rotationally received transverse to said longitudinal direction under said outwardly extending portions, each retainer preventing lateral movement of said rod rotationally received under said portions except in the outwardly extending direction of said portion, each retainer being spaced from the other retainer on opposite sides of said lower longitudinal seating surface with said portions spaced from said lower seating surface a distance effective to cause said second rod to exert a compressive force against said first rod rotationally received on said lower seating surface, clamping the rods mutually transverse to each other.
15. A method of clamping two rods mutually transverse to one another, comprising:
a. placing a second rod transversely against a first rod to form an intersection,
b. placing a structure adjacent said intersection, said structure comprising a support, an upwardly open lower seating surface supported by said support and having a longitudinal direction, and a pair of side opening rod retainers supported by said support above and on opposite sides of said upwardly open longitudinal seating surface, the side openings of said retainers opening in opposite directions for rotationally laterally receiving opposite sides of a second rod along a direction transverse to said longitudinal direction, said retainers including a top portion spaced from said lower seating surface a distance effective to cause a rod rotationally laterally received in said side opening to exert a compressive force against a rod rotationally vertically received on said lower seating surface, thereby clamping the rods mutually transversely to each other;
c. rotating said structure into said intersection to vertically receive said first rod in said longitudinal seat and to laterally receive opposite sides of said second rod under said top retainer portions to press said second rod forcibly against said first rod in said longitudinal seat.
16. A method of assembling a mat of longitudinal rods for a concrete pour, comprising:
a. providing a plurality of intersectional rod supports each comprising
i. a base,
ii. an upwardly open lower seating surface supported by said base and having a longitudinal direction, and
iii. a pair of rod retainers supported by said base above said lower longitudinal seating surface, each rod retainer comprising a raised retainer terminating in a portion extending outwardly in a direction opposite from the outwardly extending portion of the other retainer, each retainer being adapted to receive a rod under said outwardly extending portions transverse to said longitudinal direction, each retainer preventing lateral movement of a rod rotationally received under said portions except in the outwardly extending direction of said portion, each retainer being spaced from the other retainer on opposite sides of said lower longitudinal seating surface with said portions spaced from said lower seating surface a distance effective to cause a rod rotationally received under said portions to exert a compressive force against a rod rotationally received on said lower seating surface clamping the rods mutually transverse to each other.
b. laying out a plurality of first rods spaced substantially parallel to one another in a first rod direction;
c. laying out a plurality of second rods spaced substantially parallel to one another atop said first rods in a second rod direction transverse to the first rod direction to provide intersections of first and second rods at predetermined intervals;
d. placing a said rod support under an intersection of a said first rod and a second rod such that said upwardly open longitudinally directed lower seating surface is under the first rod, and rotating said rod support to align the first rod longitudinally with said longitudinally directed lower seating surface and receive the second rod under said oppositely extending portions of said retainers to clamp said second rod down onto said first rod lodged in said longitudinal lower seating surface; and
e. repeating step (d) for a plurality of said intersections.
17. A method of constructing a concrete slab comprising:
a. constructing a mat of intersecting longitudinal reinforced rods,
b. locking the intersections of the rods a predetermined height above a surface on which the slab is to be laid, using a plurality of intersectional rod supports each comprising
i. a base,
ii. a pedestal extending upwardly from said base,
iii. an upwardly open longitudinal rod support supported by said pedestal, oriented in a first direction and having sides and an interior bottom surface for longitudinally receiving a first rod in said first direction,
iv. first and second resilient retainers respectively comprising interior recesses with surfaces about a common axis transverse to said first direction, said surfaces of each recess including a lower seating surface for seating a second rod rotationally received in the recess and an upper surface for pressing the second rod against the seating surface of the recess, said retainers being supported by said pedestal spaced apart from one another above and to the sides of said rod support with a bottom of the seating surface of each of the recesses supported higher than said bottom surface of the rod support a distance equal to or less than the thickness of said first rod, said recesses each having an side opening oppositely facing in said first direction for rotationally laterally receiving opposite sides of said second rod and grippingly transversely clamping said second rod down onto said first rod.
18. A concrete slab having a top and bottom and comprising between the top and bottom a mat of intersecting longitudinal reinforced rods the intersections of which are locked a predetermined height above the bottom of the slab by a plurality of intersectional rod supports each comprising:
a. a base,
b. a pedestal extending upwardly from said base,
c. an upwardly open longitudinal rod support supported by said pedestal, oriented in a first direction and having sides and an interior bottom surface for longitudinally receiving a first rod in said first direction,
d. first and second resilient retainers respectively comprising interior recesses with surfaces about a common axis transverse to said first direction, said surfaces of each recess including a lower seating surface for seating a second rod rotationally received in the recess and an upper surface for pressing the second rod against the seating surface of the recess, said retainers being supported by said pedestal spaced apart from one another above and to the sides of said rod support with a bottom of the seating surface of each of the recesses supported higher than said bottom surface of the rod support a distance equal to or less than the thickness of said first rod, said recesses each having an side opening oppositely facing in said first direction for rotationally laterally receiving opposite sides of said second rod and grippingly transversely clamping said second rod down onto said first rod.
Priority Applications (2)
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US12/583,935 US20110047915A1 (en) | 2009-08-28 | 2009-08-28 | Clamp for fastening concrete rebar intersections |
PCT/US2010/002364 WO2011031300A1 (en) | 2009-08-28 | 2010-08-27 | Clamp for fastening concrete rebar intersections |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US12/583,935 US20110047915A1 (en) | 2009-08-28 | 2009-08-28 | Clamp for fastening concrete rebar intersections |
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US20110047915A1 true US20110047915A1 (en) | 2011-03-03 |
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US12/583,935 Abandoned US20110047915A1 (en) | 2009-08-28 | 2009-08-28 | Clamp for fastening concrete rebar intersections |
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ITVI20120135A1 (en) * | 2012-06-06 | 2013-12-07 | Matassina Srl | TERMINAL FOR THE UNION OF ELEMENTS OF PREVIOUSLY LONGITUDINAL DEVELOPMENT |
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US20140190116A1 (en) * | 2013-01-04 | 2014-07-10 | Robin Holthusen | Reinforcement Retainer |
US8935900B2 (en) * | 2013-01-04 | 2015-01-20 | Robin Holthusen | Reinforcement retainer |
US10309110B2 (en) * | 2015-05-19 | 2019-06-04 | Lifting Point Pre-Form Pty Limited | Clip |
USD781683S1 (en) * | 2015-12-01 | 2017-03-21 | Chris Chae Yong YI | Clip for securing rebar |
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CN108104379A (en) * | 2018-02-09 | 2018-06-01 | 唐山市天泽专用焊接设备有限公司 | The protective layer stent of bar-mat reinforcement built in pipe of cement, cement electric pole or steel reinforcement cage |
USD923465S1 (en) * | 2019-05-02 | 2021-06-29 | Gripple Limited | Cross wire connecting device |
US11459755B2 (en) | 2019-07-16 | 2022-10-04 | Invent To Build Inc. | Concrete fillable steel joist |
US10982444B1 (en) | 2019-09-26 | 2021-04-20 | Mettler-Toledo, LLC | Tensile reinforcements for concrete slab |
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Also Published As
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