US20080292397A1 - Ground covering support structure - Google Patents
Ground covering support structure Download PDFInfo
- Publication number
- US20080292397A1 US20080292397A1 US12/117,799 US11779908A US2008292397A1 US 20080292397 A1 US20080292397 A1 US 20080292397A1 US 11779908 A US11779908 A US 11779908A US 2008292397 A1 US2008292397 A1 US 2008292397A1
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- Prior art keywords
- aperture
- support structure
- structure according
- link
- lifting
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C9/00—Special pavings; Pavings for special parts of roads or airfields
- E01C9/08—Temporary pavings
- E01C9/086—Temporary pavings made of concrete, wood, bitumen, rubber or synthetic material or a combination thereof
Definitions
- FIG. 3 is an elevation view of the access mat of FIG. 1 .
- an access mat 10 is constructed from a series of longitudinally aligned boards 12 attached to each other. It will be appreciated that the access mat may be generally considered as a ground covering support structure that can be used to create temporary roadways as well as any outdoor work area such as at a well site or a construction site.
Abstract
A ground covering support structure is provided comprising a plurality of longitudinally aligned boards secured to one another using a plurality of transversely extending rods; and at least one aperture formed in the access mat, the at least one aperture being aligned with a corresponding one of the rods such that an exposed portion of the corresponding one of the rods passes through the aperture, each the at least one aperture containing a retractable lifting link, the retractable lifting link comprising a lifting eyelet and an elongated slot; wherein the rod passes through the elongate slot to restrict movement of the link through the aperture. The boards may advantageously be constructed using recycled beetle kill lumber or similar recycled materials.
Description
- This application claims priority from U.S. Provisional Application No. 60/917,280 filed on May 10, 2007, the contents of which are incorporated herein by reference.
- The following relates generally to ground covering support structures and has particular utility in providing temporary roadways or around cover for large, outdoor work areas such as at a well site or a construction site.
- In remote and unstable environments, a stable roadway (or any roadway) may not exist. Temporary roadways are sometimes assembled by aligning planks, boards or “mats” along a desired path. Such temporary roadways or otherwise ground covering support structures are commonly referred to as access rig or oilfield mats. The mats enable trucks and other equipment to drive over, store equipment on, or create camp sites on otherwise unstable land by providing a relatively level and stable surface.
- Where many access mats are required to build a temporary roadway, it can be onerous to transport and assemble the mats into position. Some prior access mats such as those shown in U.S. Pat. Nos. 4,600,336 to Waller, Jr.; 5,713,695 to Rogers and U.S. Publication No. 2006/0034654 to Sanders; provide lifting points, however, these lifting points can either be difficult to access or may provide a trip hazard when protruding from the upper surface.
- Where the lifting points are difficult to access, the loading/unloading, and moving of the mats can be hindered, and trip hazards can create unsafe working environments.
- It is therefore an object of the following to obviate or mitigate the above-mentioned disadvantages.
- In one aspect, there is provided a ground covering support structure comprising a plurality of longitudinally aligned boards secured to one another using, a plurality of transversely extending rods; and at least one aperture formed in the support structure, the at least one aperture being aligned with a corresponding one of the rods such that an exposed portion of the corresponding one of the rods passes through the aperture, each the at least one aperture containing a retractable lifting link, the retractable lifting link comprising a lifting eyelet and an elongated slot; wherein the rod passes through the elongate slot to restrict movement of the link through the aperture.
- In another aspect, there is provided a ground covering support structure comprising a plurality of longitudinally aligned boards secured to one another using a plurality of transversely extending rods; and at least one aperture formed in the support structure, the at least one aperture being aligned with a corresponding one of the rods such that an exposed portion of the corresponding one of the rods passes through the aperture.
- In yet another aspect, there is provided a ground covering support structure comprising at least one aperture formed therein, each the at least one aperture containing a retractable lifting link secured therein by a rod passing therethrough, the retractable lifting link comprising a lifting eyelet and an elongated slot; wherein the rod passes through the elongate slot to restrict movement of the link through the aperture.
- In yet another aspect, there is provided a retractable lifting link to permit lifting a ground covering support structure, the lifting link comprising a lifting eyelet and an elongated slot to enable the lifting link to be secured within an aperture in the support structure by a rod passing therethrough such that movement of the lifting link through the aperture is restricted.
- In yet another aspect, there is provided a ground covering support structure comprising at least one board constructed of a recycled material such as beetle kill lumber, plastic or rubber.
- An embodiment of the invention will now be described by way of example only with reference to the appended drawings wherein:
-
FIG. 1 is a perspective view of an access mat. -
FIG. 2 is an enlarged perspective view of portion A shown inFIG. 1 . -
FIG. 3 is an elevation view of the access mat ofFIG. 1 . -
FIG. 4 is a plan view of the access mat ofFIG. 1 . -
FIG. 5 is a pictorial view showing the unloading of the access mat ofFIG. 1 . -
FIG. 6 is an assembly view showing portion A ofFIG. 1 with a lifting link. -
FIG. 7 is a plan view of the lifting link ofFIG. 6 . -
FIG. 8 is a sectional view along the line B-B inFIG. 2 . -
FIG. 9 is the sectional view ofFIG. 8 assembled with the lifting link ofFIG. 7 in one configuration. -
FIG. 10 is the sectional view ofFIG. 9 in another configuration. -
FIG. 11 is a partial plan view of another embodiment. -
FIG. 12 is a sectional view of portion A along line B-B in yet another embodiment. -
FIG. 13 is a partial perspective view of the portion shown inFIG. 12 . -
FIG. 14 is a sectional view of portion A along line B-B in yet another embodiment. -
FIG. 15 is an enlarged portion of the plan view shown inFIG. 4 . -
FIG. 16 is an exploded perspective view of a rod. - Referring now to
FIG. 1 , anaccess mat 10 is constructed from a series of longitudinally alignedboards 12 attached to each other. It will be appreciated that the access mat may be generally considered as a ground covering support structure that can be used to create temporary roadways as well as any outdoor work area such as at a well site or a construction site. - The
boards 12 are preferably made from a recycled material such as beetle kill lumber e.g.—Douglas Fir or pine, which is relatively inexpensive and can be salvaged and reused for additional environmental benefits. It will be appreciated that recycled plastics or rubber materials can also be used, as well as new materials depending on the application and/or expected environment. Theboards 12 are attached by a series of transversely extendingrods 16. In the example shown inFIG. 1 , fourrods 16 are used. Aligned with theendmost rods 16, a series ofapertures 14 are formed in selectedboards 12. In the arrangement shown inFIG. 1 , fourapertures 14 are formed in the corner portions of themat 10 such that the intersection of lines passing diagonally across themat 10 is approximately in alignment with the centre of themat 10. Such an alignment is used to balance lifting loads as will be explained below. Preferably, theapertures 14 are symmetrically spaced as shown inFIG. 1 . - The
apertures 14 may be cut or mortised through the middle portion of theboards 12 as shown inFIGS. 1 , 2 and 4 or may be cut or mortised asnotches 14 a along one edge of theboard 12 as shown inFIG. 11 . Thenotches 14 a simplify construction of the selectedboards 12 by reducing the number of cuts made and/or simplifying the machinery required to create theapertures 14. Theapertures 14 may also comprise an inwardly and downwardlyangled bevel 28 cut around the perimeter of the opening on the upper surface of theboard 12 as shown inFIGS. 12 and 13 (referred to hereinafter asaperture 14 b). A similar gouge or partial bevel along one edge of theaperture 14 may also be used. - When aligned, the
boards 12 may be secured to each other along their respective lengths by drilling through the boards and embedding therods 16. As can be seen inFIGS. 15 and 16 , in one embodiment, therods 16 are threaded at one end to accommodate anut 17 and link (not shown) and are given abent portion 19 at the other end. When assembled, the holes in theboard 12 at one end can be countersunk to accommodate thenut 17 and aroutered pocket 21 can be cut into theboard 12 at the other end such that thebent portion 19 countersinks into theboard 12 when thenut 17 is tightened on therod 16. Thebent portion 19 enables themat 10 to be assembled by tightening at only one end rather than having to tighten at both ends. Since it is preferable to countersink thenut 17, only having to tighten one end increases the efficiency of the assembly process. It has been found that 1″ rods and up to 1¼″ holes provides an adequate fit between theboards 12 and therod 16. - The
endmost rods 16 are aligned with theapertures 14 such that an exposedportion 18 of therespective rods 16 pass substantially through the centre of theaperture 14 as shown inFIGS. 2 and 4 . As can be seen inFIG. 3 , when assembled, theaccess mat 10 can provide a stable surface atop a region ofunderlying material 20 such as earth or stones. Themats 10 can be placed end to end to form a temporary roadway over such underlyingmaterial 20. - The
apertures 14 can be sized such that the exposedportions 18 of therods 16 provide a set of lifting points. For such an embodiment, theapertures 14 would be sized to accommodate an appropriately sized hook or other attachment mechanism. - In another embodiment illustrated pictorially in
FIG. 5 , atransport vehicle 23 having a crane with lifting cables 25 (or other similar lifting apparatus) can rely on a series ofretractable lifting links 22 that can be retrieved from theapertures 14 to hoist theaccess mat 10. As can be seen inFIG. 6 , thelinks 22 can be attached to themat 10 by inserting therods 16 through anelongated slot 26 such that thelink 22 pulls against the exposedportion 18 to thereby lift themat 10. Thelink 22 also provides a liftingeyelet 24 or other suitable aperture, hole or slot to accommodate the attachment of a hook or lifting mechanism. Thelink 22 is also shown inFIG. 7 . It can be seen by referring toFIGS. 7 through 10 that theelongated slot 26 permits thelink 22 to be pulled out from theaperture 14 for lifting, and permits thelink 22 to be hidden within theboard 12 when not in use. In this way, when theaccess mat 10 is in situ, thelink 22 does not create a trip hazard. However, thelink 22 is readily accessible when themat 10 is to be lifted and/or transported. - It can be appreciated that the
apertures links 22 about therods 16 as shown best inFIGS. 9 and 10 or may be sized similar to the proportions shown inFIG. 6 to permit a predefined amount of pivotal movement as shown inFIG. 14 . In order to adjust the amount of pivotal movement permitted, therods 16 can be realigned towards the upper surface of themat 10 and theapertures 14 b with bevel 2S used to provide additional maneuverability. The pivotal rotation enables thelink 22 to naturally align with the tension forces in the liftingcables 25 to reduce wear and stress on theboards 12 when themat 10 is being lifted. A similar gouge or partial bevel may instead be provided along only one edge of theaperture 14 so as to provide better access to thelink 22. - As noted above, the
access mat 10 can be constructed of a recycled product such as beetle kill lumber such as Douglas fir or pine that has been found to be capable of withstanding approximately 30,000 lbs or more. Other materials may instead be selected to accommodate different loads in different environments. The advantages of using beetle kill lumber or similar waste products is that the material may be relatively inexpensive to acquire and provides an environmental benefit. Where theaccess mats 10 are to be constructed for temporary use and discarded later, the use of a recycled cost effective material is also desirable. - As can be seen in
FIG. 1 , a radio frequency identification (RFID) tag 7 can be embedded into theaccess mats 10 in aroutered pocket 8 to enable theaccess mats 10 to be included in an inventory system (not shown). The RD tags 7 provide an owner and/or renter of themats 10 with a unique identification serial number for eachindividual mat 10. Wheremany mats 10 are being used and/or rented, this enables the tracking and reconciliation of the inventory. In this way, e.g., asmats 10 are unloaded off of thevehicle 23, an REID reader (not shown) can record eachmat 10 that is placed at that particular job site. Therefore, inventory associated with that job site can be recorded for later referral, billing, etc. Asmats 10 are later loaded back onto thevehicle 23, they can again be scanned or read to ensure that allmats 10 are accounted for. It will be appreciated that the RFID tags 7 can be active or passive and other tracking devices such as barcodes (not shown) could similarly be used. Although the REID tag 7 is shown as being embedded on the side of themat 10, it will be appreciated that it may be embedded on the top, bottom, end etc. Preferably, the RFID tags 7 are sealed in thepocket 8 using a suitable adhesive or epoxy for protection, waterproofing and to not degrade the signals. - To assemble the
access mat 10, eachboard 12 is drilled to accommodate therods 16 whereby one hole is drilled in eachboard 12 for eachrod 16. A drilling station can be used with a drill press for each hole to ensure a consistent spacing between the holes. The holes for theappropriate board 12 are then counter sunk to accommodate the nuts 17 at one end of the mat and theboard 12 for the other end of themat 10 is routered to provide the appropriate number ofpockets 21. The appropriate selection ofboards 12 are then cut or mortised to form a series ofapertures 14, which may benotches 14 a or complete passages and may include abevel 28 or gouge for accessing thelink 22. - The
boards 12 consequently comprise a series of holes of which one hole is aligned substantially centrally across eachaperture 14 as shown inFIG. 2 . Also, as shown inFIGS. 15 and 16 , theappropriate board 12 includes countersunk holes and the appropriate board includes routered pockets 21 for containing thebent portions 19. It will be appreciated that there may be any number ofapertures 14 and any number ofrods 16 with corresponding countersinks and pockets 21. However, the symmetrical arrangement shown inFIG. 1 is preferred. - In each
aperture 14, alink 22 may then be placed with the lifting eyelets 24 facing up such that when therods 16 are embedded or fed into theboards 12, the exposedportions 18 of each pass through the respectiveelongated slots 26. Therods 16 are fed through theboards 12 by inserting the threaded end into the pocketed board and then through the remaining board until it emerges at the other side of themat 10 where thenut 17 is tightened thus countersinking therod 16 at both ends. As therods 16 are embedded, theboards 12 are preferably secured against each other longitudinally and a suitable adhesive may be used to strengthen the assembly if desired. When assembled, theboards 12 may be trimmed at each end to provide flush end faces to accommodate end-to-end alignment. - The
mat 10 may be lifted onto thevehicle 23 as shown inFIG. 5 , by first retrieving eachlink 22 from therespective aperture 14 and attaching the corresponding liftingcable 25 using the exposed liftingeyelet 24 when in the position shown inFIG. 6 ,FIG. 9 orFIG. 14 . Thelink 22 may be retrieved using a screwdriver, similar prying bar or even pulled out by the operator depending on the nature and size of theaperture 14. For example, theaperture 14 b having abevel 28 or similar gouge along one side may better accommodate a prying bar or screwdriver by offering a clear angle towards the liftingeyelet 24. In another example, theaperture 14 may be sized to provide enough peripheral room to enable the operator to grip thelink 22. It will be appreciated that the liftingeyelet 24 may be any suitable shape such as generally circular as shown, oval/elliptical etc. - Once each link 22 has been retrieved and attached to the lifting
cables 25, the vehicle may then lift themat 10 onto a flatbed or other surface for transport. When thecables 25 are detached, thelinks 22 simply slide into theapertures 14 leaving a substantially flush upper surface enablingseveral mats 10 to be stacked atop each other without becoming unstable. When unloading, a similar process can be followed. - It can therefore be seen that the
link 22 can be hidden when not in use and readily retrieved for lifting and/or transportation. Thelink 22 does not present a trip hazard yet greatly aids in the handling of theaccess mats 10. It will be appreciated that although preferably used with a set of correspondinglinks 22, theaccess mats 10 as shown inFIGS. 1 , 3 and 4 may also be used without thelinks 22 if so desired. It will also be appreciated that theboards 12 may also be used with any suitable material that can withstand the anticipated weight of the machinery expected to cross the temporary pathway or roadway. - Although the invention has been described with reference to certain specific embodiments, various modifications thereof will be apparent to those skilled in the art without departing from the spirit and scope of the invention as outlined in the claims appended hereto.
Claims (38)
1. A ground covering support structure comprising a plurality of longitudinally aligned boards secured to one another using a plurality of transversely extending rods; and at least one aperture formed in said access mat, said at least one aperture being aligned with a corresponding one of said rods such that an exposed portion of said corresponding one of said rods passes through said aperture, each said at least one aperture containing a retractable lifting link, said retractable lifting link comprising a lifting eyelet and an elongated slot; wherein said rod passes through said elongate slot to restrict movement of said link through said aperture.
2. The support structure according to claim 1 , said at least one aperture extending through a respective one of said boards.
3. The support structure according to claim 1 , said at least one aperture being cut as a notch along one side of a respective one of said boards such that one wall of said aperture is provided by an adjacent board.
4. The support structure according to claim 1 , said at least one aperture comprising a bevel along at least a portion of one edge.
5. The support structure according to claim 1 , said at least one aperture being sized substantially similar to said lifting link to restrict pivotal movement thereof.
6. The support structure according to claim 1 , said at least one aperture being longer in the longitudinal dimension of said board than the width of said link such that pivotal movement of said link is accommodated.
7. The support structure according to claim 6 , said at least one aperture comprising a bevel.
8. The support structure according to claim 1 , said at least one board being constructed of a recycled material such as beetle kill lumber, plastic or rubber.
9. The support structure according to claim 1 wherein said link is formed as an elongate member rounded at each end, said lifting eyelet being, formed at one end and said elongated slot being extending from the other end towards said eyelet.
10. The support structure according to claim 1 wherein said corresponding one of said rods passes through substantially the centre of said at least one aperture.
11. The support structure according to claim 1 wherein said rod is threaded at one end to accommodate a nut and is bent at another end to retain said rod.
12. The support structure according to claim 1 further comprising a radio frequency identification tag affixed thereto.
13. A ground covering support structure comprising a plurality of longitudinally aligned boards secured to one another using a plurality of transversely extending rods; and at least one aperture formed in said access mat, said at least one aperture being aligned with a corresponding one of said rods such that an exposed portion of said corresponding one of said rods passes through said aperture.
14. The support structure according to claim 13 wherein said corresponding one of said rods passes through substantially the centre of said at least one aperture.
15. The support structure according to claim 13 , said at least one aperture extending through a respective one of said boards.
16. The support structure according to claim 13 , said at least one aperture being cut as a notch along one side of a respective one of said boards such that one wall of said aperture is provided by an adjacent board.
17. The support structure according to claim 13 , said at least one aperture comprising a bevel along at least a portion of one edge.
18. The support structure according to claim 13 , said at least one aperture being sized substantially similar to said lifting link to restrict pivotal movement thereof.
19. The support structure according to claim 13 , said at least one aperture being longer in the longitudinal dimension of said board than the width of said link such that pivotal movement of said link is accommodated.
20. The support structure according to claim 19 , said at least one aperture comprising a bevel.
21. The support structure according to claim 13 , said at least one board being constructed of a recycled material such as beetle kill lumber, plastic or rubber.
22. The support structure according to claim 13 wherein said rod is threaded at one end to accommodate a nut and is bent at another end to retain said rod.
23. The support structure according to claim 13 further comprising a radio frequency identification tag affixed thereto.
24. A ground covering support structure comprising at least one aperture formed therein, each said at least one aperture containing a retractable lifting link secured therein by a rod passing therethrough, said retractable lifting link comprising a lifting eyelet and an elongated slot; wherein said rod passes through said elongate slot to restrict movement of said link through said aperture.
25. The support structure according to claim 24 , said at least one aperture extending through a respective one of said boards.
26. The support structure according to claim 24 wherein said link is formed as an elongate member rounded at each end, said lifting eyelet being formed at one end and said elongated slot being extending from the other end towards said eyelet.
27. The support structure according to claim 24 , said at least one aperture being cut as a notch along one side of a respective one of said boards such that one wall of said aperture is provided by an adjacent board.
28. The support structure according to claim 24 , said at least one aperture comprising a bevel along at least a portion of one edge.
29. The support structure according to claim 24 , said at least one aperture being sized substantially similar to said lifting link to restrict pivotal movement thereof.
30. The support structure according to claim 24 , said at least one aperture being longer in the longitudinal dimension of said board than the width of said link such that pivotal movement of said link is accommodated.
31. The support structure according to claim 30 , said at least one aperture comprising a bevel.
32. The support structure according to claim 24 , said at least one board being constructed of a recycled material such as beetle kill lumber, plastic or rubber.
33. The support structure according to claim 24 wherein said rod is threaded at one end to accommodate a nut and is bent at another end to retain said rod.
34. The support structure according to claim 24 further comprising a radio frequency identification tag affixed thereto.
35. A retractable lifting link to permit lifting a ground covering support structure, said lifting link comprising a lifting eyelet and an elongated slot to enable said lifting link to be secured within an aperture in said support structure by a rod passing therethrough such that movement of said lifting link through said aperture is restricted.
36. The lifting link according to claim 35 wherein said link is formed as an elongate member rounded at each end, said lifting eyelet being formed at one end and said elongated slot being extending from the other end towards said eyelet.
37. A ground covering support structure comprising at least one board constructed of a recycled material such as beetle kill lumber, plastic or rubber.
38. The support structure according to claim 37 further comprising a radio frequency identification tag affixed thereto.
Priority Applications (1)
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US12/117,799 US20080292397A1 (en) | 2007-05-10 | 2008-05-09 | Ground covering support structure |
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US91728007P | 2007-05-10 | 2007-05-10 | |
US12/117,799 US20080292397A1 (en) | 2007-05-10 | 2008-05-09 | Ground covering support structure |
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US20080292397A1 true US20080292397A1 (en) | 2008-11-27 |
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US12/117,799 Abandoned US20080292397A1 (en) | 2007-05-10 | 2008-05-09 | Ground covering support structure |
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