US20110164929A1 - Lite mine roof support crib and method - Google Patents
Lite mine roof support crib and method Download PDFInfo
- Publication number
- US20110164929A1 US20110164929A1 US13/065,152 US201113065152A US2011164929A1 US 20110164929 A1 US20110164929 A1 US 20110164929A1 US 201113065152 A US201113065152 A US 201113065152A US 2011164929 A1 US2011164929 A1 US 2011164929A1
- Authority
- US
- United States
- Prior art keywords
- chock
- block
- notch
- edge
- chocks
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
- E21D15/48—Chocks or the like
- E21D15/483—Chocks or the like made of flexible containers, e.g. inflatable, with or without reinforcement, e.g. filled with water, backfilling material or the like
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
- E21D15/02—Non-telescopic props
- E21D15/04—Non-telescopic props with wooden prop parts joined by double conical connectors
Abstract
Description
- This is a divisional of U.S. patent application Ser. No. 11/221,272 filed Sep. 7, 2005, which is a continuation of U.S. patent application Ser. No. 09/975,341 filed Oct. 10, 2001.
- The present invention is related to mine support cribs. More specifically, the present invention is related to mine support cribs having reduced amounts of wood or material.
- Over the last several years, increased attention has been given to more efficient systems of standing support for underground mines. U.S. Pat. No. 5,746,547 teaches a support formed by a plurality of parallel, notched chocks which are assembled to create a singular structure. While unique, this structure has the drawback of being material intensive. In many cases, the device provides more support than is necessary for the task and as such is not cost effective.
- This is also true when available or desirable wood is in limited supply, or the wood has a generally small cross section. In these circumstances, the wood available needs to be used in a way that would still allow cribs to be formed that withstand the desired vertical loads placed on them.
- The present invention pertains to a mine roof support crib. The crib comprises a plurality of chocks that are connected together through notches in the chocks to form at least three planes and able to support at least five tons of load. Each notch has only one edge.
- The present invention pertains to a mine roof support crib. The crib comprises a plurality of chocks that are connected together through notches in the chocks to form at least three planes and are able to support at least five tons of load. Each chock has a primary piece having a top and a bottom, a first block and a second block disposed on the top and bottom, respectively, and means for attaching the first block and second block to the primary piece.
- The present invention pertains to a method of forming a mine roof support crib. The method comprises the steps of placing a first chock having at least one notch with only one edge in a mine. There is the step of placing a second chock having at least one notch with only one edge in the mine and adjacent to the first chock. There is the step of linking a third chock having at least one notch with only one edge with the one notch of the first chock and the one notch of the second chock. There is the step of linking a fourth chock having at least one notch with only one edge with a second notch of the first chock and a second notch of the second chock. There is the step of linking a desired number of additional chocks having notches with only one edge onto each other or the first, second, third or fourth chocks through notches of and the respective chocks until at least two planes are formed.
- The present invention pertains to a method of forming a chock for a mine roof crib to support a mine roof. The method comprises the steps of attaching a first block to a top surface of a primary piece in spaced relationship to each end of the primary piece to define notches at each end of the top surface of the primary piece. There is the step of attaching a second block to a bottom surface of the primary piece in spaced relationship to each end of the primary piece to define notches at each end of the bottom surface of the primary piece.
- In the accompanying drawings, the preferred embodiment of the invention and preferred methods of practicing the invention are illustrated in which:
-
FIG. 1 shows a chock of a first embodiment of the present invention. -
FIG. 2 shows a chock of a second embodiment of the present invention. -
FIGS. 3 and 4 show a chock of a third embodiment of the present invention. -
FIGS. 5 and 6 show a chock of a fourth embodiment of the present invention. -
FIGS. 7 , 8, 9 and 10 show a chock of a fifth embodiment of the present invention with a spacer, bar pin or staple, respectively. -
FIG. 11 shows a crib of the present invention. -
FIG. 12 is a graph of support performance. - Referring now to the drawings wherein like reference numerals refer to similar or identical parts throughout the several views, and more specifically to
FIG. 11 thereof, there is shown a mineroof support crib 10. Thecrib 10 comprises a plurality ofchocks 12 that are connected together throughnotches 14 in thechocks 12 to form at least threeplanes 16 and able to support at least five tons of load. Each notch has only oneedge 18. - Preferably, the plurality of
chocks 12 connected together can support at least 20 tons of load. Eachchock 12 preferably has along axis 20 and each notch of thechock 12 is cut at a right angle to thelong axis 20 of thechock 12. Preferably, the plurality ofchocks 12 forms fourplanes 16. - At least two of the
planes 16 are preferably in perpendicular relation with each other. Each notch can have either aspacer 22 or abar pin 24 or astaple 26 defining areceive zone 28 with theedge 18 of the corresponding notch, as shown inFIGS. 7-10 . The receivezone 28 receives a notch of anadjacent chock 12. The height of thespacer 22,bar pin 24 orstaple 26 is preferably less than the rise of theedge 18 of the corresponding notch. - Each
chock 12 preferably has aprimary piece 30 having a top and a bottom, afirst block 36 and asecond block 38 disposed on the top and bottom, respectively, and means for attaching thefirst block 36 andsecond block 38 to theprimary piece 30. An outward surface of thefirst block 36 andsecond block 38 defines theedge 18 of a first notch and of a second notch of eachchock 12. Thecrib 10 preferably includes abase 48 on which thechocks 12 are disposed. Thebase 48 is adapted to reside on afloor 50 of the mine. Preferably, thecrib 10 includes atop portion 52 which is disposed on thechocks 12 which is adapted to fit between thechocks 12 and aroof 54 of the mine so thechocks 12 are prestressed. - The present invention pertains to a mine
roof support crib 10, as shown inFIGS. 1 and 11 . Thecrib 10 comprises a plurality ofchocks 12 that are connected together throughnotches 14 in thechocks 12 to form at least threeplanes 16 and are able to support at least five tons of load. Eachchock 12 has aprimary piece 30 having atop surface 32 and abottom surface 34, afirst block 36 and asecond block 38 disposed on the top and bottom, respectively, and means for attaching thefirst block 36 andsecond block 38 to theprimary piece 30. - Preferably, the attaching means includes a
nail 56 orwire 58. Eachchock 12 can include athird block 40 and afourth block 42 in spaced relationship with the first andsecond blocks FIG. 2 . The third andfourth blocks primary piece 30. Preferably, theprimary piece 30 has a first end and a second end and atop surface 32 and abottom surface 34 and thefirst block 36,second block 38,third block 40 andfourth block 42 are in spaced relationship from the first end of thetop surface 32, first end of thebottom surface 34, second end of thetop surface 32 and second end of thebottom surface 34, respectively, to formnotches 14 in thechock 12. - The
first block 36 andsecond block 38 are preferably made of oak, hard gum, wattle, maple, hickory, poplar or pine or concrete or a composite of wood fiber cement. Preferably, theprimary piece 30 has a first end and a second end and atop surface 32 and abottom surface 34 and thefirst block 36 andsecond block 38 are in spaced relationship with the first end and second end of thetop surface 32, and the first end and second end of thebottom surface 34, respectively, to formnotches 14 in thechock 12 with each notch having anedge 18 defined by the respective block, to receive a notch from anadjacent chock 12. - Alternatively, each notch has either a
spacer 22 or abar pin 24 or a staple 26 defining a receivezone 28 with theedge 18 of the corresponding notch, the receivezone 28 receiving a notch of anadjacent chock 12, as shown inFIGS. 7-10 . The height of thespacer 22,bar pin 24 orstaple 26 can be less than the rise of theedge 18 of the corresponding notch. - The
crib 10 can include afifth block 44 and asixth block 46 in spaced relationship with the first andsecond blocks FIGS. 3 and 4 . The third and fifth, and fourth andsixth blocks first block 36 andsecond block 38, respectively, to receive a notch from arespective chock 12. The height of the third, fourth, fifth andsixth blocks first block 36 andsecond block 38. - The present invention pertains to a method of forming a mine
roof support crib 10. The method comprises the steps of placing afirst chock 12 having at least one notch with only oneedge 18 in a mine. There is the step of placing asecond chock 12 having at least one notch with only oneedge 18 in the mine and adjacent to thefirst chock 12. There is the step of linking athird chock 12 having at least one notch with only oneedge 18 with the one notch of thefirst chock 12 and the one notch of thesecond chock 12. There is the step of linking afourth chock 12 having at least one notch with only oneedge 18 with a second notch of thefirst chock 12 and a second notch of thesecond chock 12. There is the step of linking a desired number ofadditional chocks 12 havingnotches 14 with only oneedge 18 onto each other or the first, second, third orfourth chocks 12 throughnotches 14 of and therespective chocks 12 until at least twoplanes 16 are formed. - Preferably, after the linking a desired number of
additional chocks 12, there is the step of supporting a load of at least five tons with theadditional chocks 12 and the first, second, third andfourth chocks 12. - The present invention pertains to a method of forming a
chock 12 for amine roof crib 10 to support amine roof 54. The method comprises the steps of attaching afirst block 36 to atop surface 32 of aprimary piece 30 in spaced relationship to each end of theprimary piece 30 to definenotches 14 at each end of thetop surface 32 of theprimary piece 30. There is the step of attaching asecond block 38 to abottom surface 34 of theprimary piece 30 in spaced relationship to each end of theprimary piece 30 to definenotches 14 at each end of thebottom surface 34 of theprimary piece 30. - Preferably, there is the step of placing a stop adjacent each end of the
primary piece 30 and in spaced relationship with the respective block to define a receivingzone 28 to receive a notch of anotherchock 12. The stop preferably includes blocks, spacers, 22 bar pins 24 orstaples 26. - In the operation of the invention and referring to
FIG. 11 , there is shown acrib 10 that is formed fromchocks 12 as shown inFIG. 1 . Thechock 12, shown inFIG. 1 , is formed of aprimary piece 30 made of wood and afirst block 36 on top of theprimary piece 30 and asecond block 38 on the bottom of theprimary piece 30. Thefirst block 36 and thesecond block 38 are attached to theprimary piece 30 bynails 56 or by spinningwire 58 through the wood, as is well known in the art. The end of each surface of thefirst block 36 and thesecond block 38 is in spaced relationship with the respective end of theprimary piece 30, defining a notch with anedge 18. - In another embodiment, as shown in
FIG. 2 , there is aprimary piece 30 and afirst block 36,second block 38,third block 40 andfourth block 42 attached to theprimary piece 30. Each block is in spaced relation with the other block on the same surface of thechock 12, and in spaced relation with the respective end of theprimary piece 30. Theedge 18 of each block adjacent to the respective end of theprimary piece 30 defines a notch. Theedge 18 of each block defines anedge 18 of a notch in which a notch of anotherchock 12 is dispensed. - In another embodiment, as shown in
FIG. 3 andFIG. 4 , there is shown achock 12 having a block attached at the four corners, with each of these blocks in spaced relationship with the middle blocks on their respective surface of theprimary piece 30. - This embodiment of a
chock 12 would serve three purposes. 1, to increase the contact area and hence increase the load capacity of thecrib 10. 2, to help ensure thechocks 12 on the layer above and the layer below are positioned in the correct place between the end blocks and the respective middle blocks. 3, to ensure the interlock and prevent thechocks 12 from moving outwards under load. -
FIGS. 5 and 6 show yet another embodiment of achock 12 that is similar to the embodiment shown inFIGS. 3 and 4 . The only difference is that the blocks on each corner have a height which is less than the rise of the attached center blocks. This embodiment of achock 12 would serve purposes 2 and 3, as described above, for thechock 12 ofFIGS. 3 and 4 . -
FIGS. 7 , 8, 9 and 10 show yet another embodiment of achock 12 for use in themine roof crib 10. In thechock 12 shown inFIG. 7 , there is again a first piece and a second piece attached to theprimary piece 30. Adjacent to the ends of theprimary piece 30 are placed eitherspacers 22, bar pins 24 orstaples 26 where their height is less than the rise of the first and second pieces. The placement of thespacers 22, bar pins 24 orstaples 26 is well known in the art. The purposes of such achock 12, is the same as the purposes identified for thechock 12 inFIGS. 5 and 6 . - The attachment of the blocks to the
primary piece 30 can be accomplished with the use ofnails 56 or by spinningwire 58 through wood. The blocks can be of various types of wood, such as those mentioned above. The blocks to be made of concrete that are cast with holes through them to allowwires 58 to pass to them and be inserted into the wood of theprimary piece 30 as is well known in the art. The blocks can also be made out of a wood cement composite, as is well known in the art. - The
chocks 12 of the various embodiments are stacked on top of each other to a desired height on a base 48 which could be formed simply of twoprimary pieces 30 in spaced relationship with each other and in parallel with each other a distance apart that would conform withnotches 14 of achock 12 that would be fitted on them, as shown inFIG. 7 . Once thechocks 12 stacked on top of each other reach a desired height, then planks or grout bags or other commonly used tops are inserted on thechocks 12 to prestress thecrib 10 with themine roof 54. - All of these
cribs 10 can support at least 5 tons of compression load without failure, and in fact even greater loads, as shown inFIG. 12 .FIG. 12 is based on chocks 110 cm long by 15 cm high (primary piece and first and second blocks) by 7.5 cm wide forming a crib 1.3 m high. - The
crib 10 is made functional as a support by filling in any space between thetop portion 52 of the support and the surface of the rock mass to be supported by one or more of the following methods. - Timber or metal blocking and
wedges 85 installed either parallel to or perpendicular to thelong axis 20 of thechocks 12. This material would be installed preferably at the opposing ends of eachchock 12 and at the points of engagement of thenotches 14, as shown inFIG. 11 . - Using
grout bladders 87 into which a polymeric or cementitious grout can be pumped to fill in the space between the support and the rock surface, as shown inFIG. 11 . These grout bladders may be made to match the shape of the support or may be substantially larger and made to cover multiple supports installed in a given area. - Both of the above techniques if installed with sufficient force may enable the support to provide an active restraint and reinforcement effect to the rock mass. See U.S. patent application Ser. No. 09/415,387, allowed but not yet issued, incorporated by reference herein.
- Preferably, to more efficiently utilize the wood available, by minimizing its use, but attaining a desired load capability, the height of a chock is about two times its width. In contrast, a more timber intensive chock would have its height equal to its width.
- Furthermore, by forming a chock out of pieces, the pieces can be of different materials, some stronger, some weaker, to essentially allow mixing and matching of the pieces, to spread the strong pieces out with weaker pieces to form many chocks, when there is not an unlimited supply of stronger pieces. For instance, the primary piece can be a less strong wood while the first and second blocks can be of a stronger or denser wood, or vice versa. This is one of the advantages of attaching blocks, such as concrete or wood fiber cement (which are not even made of wood), which is stronger or denser then the other types of wood that can be used for the primary piece. This also allows for the chocks to have their cross section built up from wood that has a smaller than desired cross section. By attaching the blocks to the primary piece, each of which by themselves has a cross-section too small, together they have a cross section which is larger, for better supporting a mine roof.
- Although the invention has been described in detail in the foregoing embodiments for the purpose of illustration, it is to be understood that such detail is solely for that purpose and that variations can be made therein by those skilled in the art without departing from the spirit and scope of the invention except as it may be described by the following claims.
Claims (14)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/065,152 US20110164929A1 (en) | 2001-10-10 | 2011-03-15 | Lite mine roof support crib and method |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/975,341 US20030068204A1 (en) | 2001-10-10 | 2001-10-10 | Lite mine roof support crib and method |
US11/221,272 US20060002770A1 (en) | 2001-10-10 | 2005-09-07 | Lite mine roof support crib and method |
US13/065,152 US20110164929A1 (en) | 2001-10-10 | 2011-03-15 | Lite mine roof support crib and method |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/221,272 Division US20060002770A1 (en) | 2001-10-10 | 2005-09-07 | Lite mine roof support crib and method |
Publications (1)
Publication Number | Publication Date |
---|---|
US20110164929A1 true US20110164929A1 (en) | 2011-07-07 |
Family
ID=25522923
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/975,341 Abandoned US20030068204A1 (en) | 2001-10-10 | 2001-10-10 | Lite mine roof support crib and method |
US11/221,272 Abandoned US20060002770A1 (en) | 2001-10-10 | 2005-09-07 | Lite mine roof support crib and method |
US13/065,152 Abandoned US20110164929A1 (en) | 2001-10-10 | 2011-03-15 | Lite mine roof support crib and method |
Family Applications Before (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/975,341 Abandoned US20030068204A1 (en) | 2001-10-10 | 2001-10-10 | Lite mine roof support crib and method |
US11/221,272 Abandoned US20060002770A1 (en) | 2001-10-10 | 2005-09-07 | Lite mine roof support crib and method |
Country Status (5)
Country | Link |
---|---|
US (3) | US20030068204A1 (en) |
AU (1) | AU2002362655B2 (en) |
GB (1) | GB2395732B (en) |
WO (1) | WO2003031773A2 (en) |
ZA (1) | ZA200402759B (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7841805B2 (en) * | 2007-09-12 | 2010-11-30 | Board Of Trustees Of Southern Illinois University | Engineered composite wooden crib for use as a mine support |
US8777522B2 (en) * | 2008-01-14 | 2014-07-15 | Micon | Mine seal with multiple mortared walls |
WO2010088416A1 (en) * | 2009-01-30 | 2010-08-05 | Three Rivers Packaging, Inc. | Stackable mine rock shields |
WO2017127900A1 (en) * | 2016-01-29 | 2017-08-03 | Hoan Holdings Pty Ltd | A crib element and crib arrangements thereto |
US11479939B2 (en) * | 2019-11-26 | 2022-10-25 | Dica Marketing Company | Slot lock cribbing block |
Citations (20)
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US563405A (en) * | 1896-07-07 | Device for use in erecting dock-bentss | ||
US640377A (en) * | 1899-06-09 | 1900-01-02 | Mathias Haentges | Crib for building piers, walls, &c. |
US1331186A (en) * | 1916-08-08 | 1920-02-17 | Garay Francis J De | Apparatus for sinking excavations for foundations, piers, columns, &c. |
US1514081A (en) * | 1917-03-02 | 1924-11-04 | Frank R Hahn | Concrete building construction |
US1704941A (en) * | 1926-06-10 | 1929-03-12 | Massey Concrete Products Corp | Cribbing |
US1773579A (en) * | 1926-11-18 | 1930-08-19 | Otto S Flath | Cribbing |
US2123016A (en) * | 1937-06-12 | 1938-07-05 | Massey Concrete Products Corp | Cribbing |
US2315441A (en) * | 1940-08-23 | 1943-03-30 | Massey Concrete Products Compa | Cribbing |
US2828613A (en) * | 1955-09-26 | 1958-04-01 | Theron D Wilson | Reinforced concrete cribbing |
US3631682A (en) * | 1970-01-26 | 1972-01-04 | Hilfiker Pipe Co | Reinforced concrete cribbing |
US4521203A (en) * | 1983-01-05 | 1985-06-04 | International Honeycomb Corporation | Toy construction kit |
US4664358A (en) * | 1983-05-27 | 1987-05-12 | Clark Erin C | Free standing wall structures |
US4664562A (en) * | 1980-10-30 | 1987-05-12 | Clark Erin C | Cribwalling |
US4823528A (en) * | 1987-02-03 | 1989-04-25 | Garland Faw | Log wall and corner joint for log building structures |
US4905409A (en) * | 1987-11-09 | 1990-03-06 | Cole Clayton K | Landscaping timber |
US5746547A (en) * | 1995-10-19 | 1998-05-05 | Strata Products, Inc. | Mine support cribs |
US5865929A (en) * | 1995-06-21 | 1999-02-02 | Sing; Peter | Method of producing laminated wood beams |
GB2335678A (en) * | 1999-03-09 | 1999-09-29 | George Raymond Sharp | Crib member for mine support crib |
US6189271B1 (en) * | 1995-02-09 | 2001-02-20 | Daniel L. Christensen | Building systems |
US6352392B1 (en) * | 1999-10-08 | 2002-03-05 | Strata Products (Usa), Inc. | Mine roof support crib having only two or three planes, and method |
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US99550A (en) * | 1870-02-08 | Improvement in fruit-jars | ||
US1516096A (en) * | 1918-09-07 | 1924-11-18 | Clark Ag | Building construction |
US3343301A (en) * | 1964-11-23 | 1967-09-26 | Adelman Philip | Inclined planter and retaining wall construction |
DD287299A5 (en) * | 1989-08-25 | 1991-02-21 | Veb Bmk Chemie,Betrieb Projektierung Und Technologie,De | FORMWORK FOR NON-FERTILIZED CONCRETE COMPONENTS |
CA2114677C (en) * | 1994-02-01 | 1997-12-30 | Horacio Correia | Block for constructing retaining wall |
-
2001
- 2001-10-10 US US09/975,341 patent/US20030068204A1/en not_active Abandoned
-
2002
- 2002-10-04 GB GB0406143A patent/GB2395732B/en not_active Expired - Lifetime
- 2002-10-04 WO PCT/US2002/031725 patent/WO2003031773A2/en active Application Filing
- 2002-10-04 AU AU2002362655A patent/AU2002362655B2/en not_active Expired
-
2004
- 2004-04-08 ZA ZA200402759A patent/ZA200402759B/en unknown
-
2005
- 2005-09-07 US US11/221,272 patent/US20060002770A1/en not_active Abandoned
-
2011
- 2011-03-15 US US13/065,152 patent/US20110164929A1/en not_active Abandoned
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US563405A (en) * | 1896-07-07 | Device for use in erecting dock-bentss | ||
US640377A (en) * | 1899-06-09 | 1900-01-02 | Mathias Haentges | Crib for building piers, walls, &c. |
US1331186A (en) * | 1916-08-08 | 1920-02-17 | Garay Francis J De | Apparatus for sinking excavations for foundations, piers, columns, &c. |
US1514081A (en) * | 1917-03-02 | 1924-11-04 | Frank R Hahn | Concrete building construction |
US1704941A (en) * | 1926-06-10 | 1929-03-12 | Massey Concrete Products Corp | Cribbing |
US1773579A (en) * | 1926-11-18 | 1930-08-19 | Otto S Flath | Cribbing |
US2123016A (en) * | 1937-06-12 | 1938-07-05 | Massey Concrete Products Corp | Cribbing |
US2315441A (en) * | 1940-08-23 | 1943-03-30 | Massey Concrete Products Compa | Cribbing |
US2828613A (en) * | 1955-09-26 | 1958-04-01 | Theron D Wilson | Reinforced concrete cribbing |
US3631682A (en) * | 1970-01-26 | 1972-01-04 | Hilfiker Pipe Co | Reinforced concrete cribbing |
US4664562A (en) * | 1980-10-30 | 1987-05-12 | Clark Erin C | Cribwalling |
US4521203A (en) * | 1983-01-05 | 1985-06-04 | International Honeycomb Corporation | Toy construction kit |
US4664358A (en) * | 1983-05-27 | 1987-05-12 | Clark Erin C | Free standing wall structures |
US4823528A (en) * | 1987-02-03 | 1989-04-25 | Garland Faw | Log wall and corner joint for log building structures |
US4905409A (en) * | 1987-11-09 | 1990-03-06 | Cole Clayton K | Landscaping timber |
US6189271B1 (en) * | 1995-02-09 | 2001-02-20 | Daniel L. Christensen | Building systems |
US5865929A (en) * | 1995-06-21 | 1999-02-02 | Sing; Peter | Method of producing laminated wood beams |
US5746547A (en) * | 1995-10-19 | 1998-05-05 | Strata Products, Inc. | Mine support cribs |
GB2335678A (en) * | 1999-03-09 | 1999-09-29 | George Raymond Sharp | Crib member for mine support crib |
US6352392B1 (en) * | 1999-10-08 | 2002-03-05 | Strata Products (Usa), Inc. | Mine roof support crib having only two or three planes, and method |
Also Published As
Publication number | Publication date |
---|---|
US20060002770A1 (en) | 2006-01-05 |
GB0406143D0 (en) | 2004-04-21 |
AU2002362655B2 (en) | 2008-04-03 |
ZA200402759B (en) | 2006-06-28 |
WO2003031773A2 (en) | 2003-04-17 |
WO2003031773A3 (en) | 2004-02-19 |
US20030068204A1 (en) | 2003-04-10 |
GB2395732B (en) | 2005-11-23 |
GB2395732A (en) | 2004-06-02 |
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