The present invention relates to concrete forming panels, and in particular, relates to concrete forming panels having a series of interlocking panel sections mechanically secured to adjacent panel sections.
Concrete forming panels are commonly used in the construction industry to quickly assemble a concrete form. Forming panels have been used for many years, and often have a plywood concrete engaging face with a reinforcing structure secured on a rear side thereof to support the concrete load.
It is also known to use a concrete forming panel fabricated from aluminum extrusions where these extrusions are mechanically connected to define the forming panel. One such example of this structure is illustrated in Canadian Patent 2,141,463 that is owned by the present applicant. In this reference, the concrete forming panel is broken into a number of panel sections where each section is an aluminum extrusion. The aluminum extrusions are connected to an adjacent extrusion by a hook and slot arrangement, and by a curved flange provided adjacent a rear edge beneath the hook and slot arrangement. This curved flange is connected to a structural member of the adjacent panel section to mechanically secure the two sections together and to maintain a predetermined angle of the forward face of each of these panels. With this arrangement, a reinforced box-like structure is provided beneath the mechanical securement (hook and slot) of the two panels at the forward face.
With the structure as disclosed in Canadian Patent 2,141,463 the connected panel sections required additional support and the panel sections were prone to deflection at intermediary positions, even if the rear face of the panel was supported.
It would be desirable to provide a concrete forming panel having the desirable characteristic of being assembled from a series of extrusions while providing a panel that is easy to assemble and is relatively stiff.
A concrete forming panel according to the present invention comprises at least first and second interlocking panel sections having a mechanical hinge connection joining the sections at an intermediate position extending in the length of the forming panel. The mechanical connection comprises a hook portion on the first panel received in a slot portion of a second panel and the mechanical connection includes a stop abutment of the hinge connection that is engaged when the panel sections are joined and aligned to form the forming face of the panel. The panel includes a series of brace members extending across the panel section on a rear surface thereof. Each brace member maintains engagement of any stop abutments and provides a rear support of the mechanical connection opposing deflection of the forming face towards the brace member.
In an aspect of the invention, the second panel below the slot includes a downwardly extending web member having a distal end thereof in engagement with the series of brace members to provide the rear support of the mechanical connection.
In a further aspect of the invention, the downwardly extending web member includes a flange or bead portion at the distal end in engagement with the series of braces.
In a further aspect of the invention, the panel includes on either side of the length thereof, downwardly extending side rails and each of the series of brace members extend between and are secured to the side rails.
In a further aspect of the invention, the side rails include an inwardly extending flange portion, and the inwardly extending flange portion supports the brace members at opposite ends thereof.
In a further aspect of the invention, the brace members have an interference fit between said side rails and any of the flange or bead portions maintaining the panel in an assembled configuration.
In a preferred aspect of the invention, the forming panel includes at least a third panel section connected as an intermediary between the first and second panel sections.
In yet a further aspect of the invention, a pair of end rails close opposed ends of the concrete forming panel and are secured to the at least two panel sections.
In yet a further aspect of the invention, the brace members are tubular extrusion members fixedly secured to the side rails.
Preferred embodiments of the invention are shown in the drawings, wherein:
The concrete forming panel 2 shown in
The concrete forming panel 2, when the various panel sections are interconnected, has a series of brace members 16, 18 and 20 that engage a rear face of the panel sections and also extend between the side panel sections 4 and 6. These brace members have a slight interference fit with the connected panel sections and the braces maintain the mechanical connections at the front face of the panel in locked engagement and maintain alignment of the panel section to define the planar front face of the forming panel.
The side panel sections 4 and 6 as shown in
As shown in
Beneath the slot 46, the extrusion includes a downwardly extending web member 52 that terminates in a bottom flange or bead portion 54. This web and bottom flange support the slot 46 and, when engaged with the bracing member 18, oppose downward deflection of the top surface of the panel 4 form a stiff load transmitting structure having a top flange, a connecting web and a bottom flange. This can be appreciated from a review of
This particular support of the side panel section 4 supports the free end of this panel section and also supports the hook 40 of the side panel section 6. In the embodiment of
In the embodiment shown in
From a review of the assembled panel of
Additional braces can be added as required. The side panel sections 4, 4a and 6 as shown in the drawings have relatively stiff sides at the edges of the concrete forming panel, and the side members 76 and 80 shown in
Other arrangements for securing of the panel sections to each other can be used, however the use of tack welding simplifies the manufacturing steps and also reduces the cost to manufacture the panel. As can be appreciated, the particular design of the concrete forming panel allows convenient assembly of the various components and these components can generally be maintained in their assembled condition in preparation for welding. The insertion of the bracing members maintains the panel sections in preparation for final securement. Typically the end rails are merely located at the ends of the extrusions and are tack welded in place.
The particular hook and slot arrangement does provide a positive stop face that limits angular movement of adjacent panels, and this stop face assists in defining the planar front face of the concrete forming panel. A very small seam may be visible at this stop face, however this seam is under compression and as such any joining line is quite thin. This improves the finished surface of the concrete. The use of aluminum extrusions also results in the concrete forming panel being easily separated from the concrete and a clean finished surface being defined.
When these concrete forming panels are in place and under load, they are connected to adjacent panels using the various ports 30. Suitable collars can be inserted in the ports, and the panels can be assembled using steel-type connecting pins and wedges. The assembled panels can then be supported by further structural members provided behind the panels. When the panels are loaded due to the concrete load, this load tends to further tighten the mechanical joint and to tighten the securement of the panel sections. The braces positively support the rear surface of the forming face. With this arrangement, the seam at the junction of the hook and slot is under compression and the seam is quite small.
The particular arrangement shown and described allows a series of intermediary panels to be connected between the side panels, and thus panels of different widths are easily produced. The mechanical connection is basically the same, and the number of intermediary supports may be increased. Furthermore, it can be appreciated as shown with respect to the side panel section 4a, these side panel sections can also be of different widths and therefore the actual width of the concrete forming panel can easily be modified to meet a particular need of a contractor or a client. With wider concrete forming panels, it may be appropriate to also provide some tack welding of the bracing members to the various support members where they engage or pass over the bracing members.
The panel sections as described extend in the length of the panel; however it is also possible to use shorter panel sections extending in the width. This arrangement is less desirable as the number of seams increase and the bracing would then extend in the length.
It has been found that this concrete forming panel, using the mechanical connection of a plurality of sections, provides a structure which is cost effective to produce and provides excellent characteristics with respect to finish and durability. The design allows easy modification for building of concrete forming panels in different widths and lengths as may be required.
It is possible to modify the individual panel sections, the bracing members and end rails to provide appropriate support. For example, where loads are higher, the bracing members may be slightly wider or more bracing members provided to provide proper support. The desired trapezoidal shape of the brace members is also convenient for a worker to grasp and is of assistance in assembly and dismantling.
Although various preferred embodiments of the present invention have been described herein in detail, it will be appreciated by those skilled in the art, that variations may be made thereto without departing from the spirit of the invention or the scope of the appended claims.
Number | Date | Country | Kind |
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2668598 | Jun 2009 | CA | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/CA2010/000860 | 6/7/2010 | WO | 00 | 1/13/2012 |
Publishing Document | Publishing Date | Country | Kind |
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WO2010/142023 | 12/16/2010 | WO | A |
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Number | Date | Country | |
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20120119061 A1 | May 2012 | US |