GROUND COVERING SUPPORT STRUCTURE
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.
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.
TECHNICAL FIELDThe 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.
BACKGROUNDIn 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.
SUMMARYIn 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:
Referring now to
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. The boards 12 are attached by a series of transversely extending rods 16. In the example shown in
The apertures 14 may be cut or mortised through the middle portion of the boards 12 as shown in
When aligned, the boards 12 may be secured to each other along their respective lengths by drilling through the boards and embedding the rods 16. As can be seen in
The endmost rods 16 are aligned with the apertures 14 such that an exposed portion 18 of the respective rods 16 pass substantially through the centre of the aperture 14 as shown in
The apertures 14 can be sized such that the exposed portions 18 of the rods 16 provide a set of lifting points. For such an embodiment, the apertures 14 would be sized to accommodate an appropriately sized hook or other attachment mechanism.
In another embodiment illustrated pictorially in
It can be appreciated that the apertures 14, 14a, 14b can be sized to restrict pivotal movement of the links 22 about the rods 16 as shown best in
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 the access 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
To assemble the access mat 10, each board 12 is drilled to accommodate the rods 16 whereby one hole is drilled in each board 12 for each rod 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 the appropriate board 12 are then counter sunk to accommodate the nuts 17 at one end of the mat and the board 12 for the other end of the mat 10 is routered to provide the appropriate number of pockets 21. The appropriate selection of boards 12 are then cut or mortised to form a series of apertures 14, which may be notches 14a or complete passages and may include a bevel 28 or gouge for accessing the link 22.
The boards 12 consequently comprise a series of holes of which one hole is aligned substantially centrally across each aperture 14 as shown in
In each aperture 14, a link 22 may then be placed with the lifting eyelets 24 facing up such that when the rods 16 are embedded or fed into the boards 12, the exposed portions 18 of each pass through the respective elongated slots 26. The rods 16 are fed through the boards 12 by inserting the threaded end into the pocketed board and then through the remaining board until it emerges at the other side of the mat 10 where the nut 17 is tightened thus countersinking the rod 16 at both ends. As the rods 16 are embedded, the boards 12 are preferably secured against each other longitudinally and a suitable adhesive may be used to strengthen the assembly if desired. When assembled, the boards 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 the vehicle 23 as shown in
Once each link 22 has been retrieved and attached to the lifting cables 25, the vehicle may then lift the mat 10 onto a flatbed or other surface for transport. When the cables 25 are detached, the links 22 simply slide into the apertures 14 leaving a substantially flush upper surface enabling several 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. The link 22 does not present a trip hazard yet greatly aids in the handling of the access mats 10. It will be appreciated that although preferably used with a set of corresponding links 22, the access mats 10 as shown in
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
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.
Type: Application
Filed: May 9, 2008
Publication Date: Nov 27, 2008
Inventors: Greg FARNEY (Calgary), Mike MCGINLEY (Calgary), Ian BARNETT (Sundre)
Application Number: 12/117,799
International Classification: E01C 5/18 (20060101);