Combination lift and anchor connector for fabricated wall and floor panels
An apparatus and method for interconnecting concrete precast floor and wall panels is provided. More specifically, one embodiment of the present invention includes an adjustable connector with a captive nut that is embedded into a wall panel. A floor panel that includes an aperture integrated therethrough is placed adjacent to the adjustable connector wherein the captive nut therein may be positioned in line with the aperture. A threaded rod is then placed through the aperture of the floor panel and a nut is placed thereon thus providing a secure interconnection between the floor panel and the wall panel.
This application claims the benefit of pending U.S. provisional patent application Ser. No. 60/667,590, filed on Apr. 1, 2005, the application being incorporated herein by reference in its entirety.
FIELD OF THE INVENTIONThe present invention relates to low density prefabricated concrete building panels, and more specifically an apparatus and method for interconnecting prefabricated concrete floor and roof panels to wall panels, and which utilizes a selectively adjustable connector. More specifically, one embodiment of the invention employs an adjustable captive nut in conjunction with a threaded rod to interconnect adjoining floor and wall panels.
BACKGROUND OF THE INVENTIONPrecast concrete panels are well known in the art and have been used for decades as cost effective building components. More specifically, Precast concrete panels are commonly found in office buildings, parking garages, homes, bridges, etc., and are desirable for their resistance to fire, wind, seismic activity and various other occurrences that would destroy or severely damage common wood or steel structures. Precast concrete structures are generally inexpensive and quick to construct since the building members, i.e. floor and wall panels, are prefabricated off-site and shipped to the construction site to be erected. However, there are some drawbacks of the method of assembling precast concrete walls and floors found in the prior art.
One drawback of assembling precast concrete building panels of the prior art is that the operation is often labor intensive. More specifically, the construction of existing concrete structures usually requires complicated alignments and connections of the wall panels and the floor panels. Since the panels are heavy, often weighing tons, and are placed by cranes, alignment and placement of the concrete wall and floor panels may also be dangerous. In addition, sometimes unintended collisions of the panels may lead to damage thereto wherein new panels must be obtained, thus increasing the time for construction.
Another related drawback of constructing concrete buildings of the prior art is that the floor and wall panels often are erected in a complicated interlocking scheme. More specifically, cut-outs and/or protrusions that are designed to interlock and bear upon each other are generally provided that must be carefully aligned. Thus, the inherently customized panels of the structure make the construction process limited wherein the interchangeability of the panels is not possible. Further, also increasing the time and expense and possible damage to the panels, field drilling is often required to allow for the interconnection of metal fasteners that tie adjacent panels together. After the metal fasteners are inserted, grout or other ceiling materials are used to seal the field drilled holes, thus increasing the time it takes to erect the structure.
Still yet another drawback of concrete building structures is that the interlocking joints of the prior art are often stable and rigid. This may not seem at first glance as a drawback, however it is often desirable to let a building “float” wherein vibrations caused by high winds or seismic activity are compensated. Fixed joints and size or simple bearing joints found in the prior art are often too rigid or not rigid enough to withstand an earthquake or hurricane, for example.
Accordingly, there is a significant need in the construction and building industry to provide a precast concrete building panel for use in modular construction that is lightweight, provides superior strength and has high insulative values. Further, a method for lifting, transporting and interconnecting building panels and floor and ceiling panels needed that is inexpensive, utilizes commonly known manufacturing equipment, and which can be easily integrated into mass produced building panels for use in the modular construction of warehouses, low cost permanent housing, hotels and other buildings.
Still yet another drawback of concrete building construction is that the interlocking joints of the prior art are often stable and rigid. This may not seem at first glance as a drawback, however, it is often desirable to let a building “float” wherein vibrations caused by high winds or seismic activity may be compensated therefor. The rigid joints or simple bearing joints may often be too rigid or not rigid enough to withstand an earthquake or hurricane, for example.
Accordingly, there is a significant need in the construction and building industry to provide a composite building panel that may be used in modular construction and which is lightweight, provides superior strength and has high insulative values. Further, a method for lifting, transporting and interconnecting building panels and floor and ceiling panels needed that is inexpensive, utilizes commonly known manufacturing equipment, and which can be used to mass produce building panels for use in the modular construction of warehouses, low cost permanent housing, hotels, and other buildings.
SUMMARY OF THE INVENTIONIt is one aspect of the present invention to provide a system for interconnecting a precast concrete wall panel with a precast concrete floor panel, and alternatively to interconnect two wall panels with or without a floor or roof panel. More specifically, one embodiment of the present invention includes a selectively adjustable connector with a captive nut that is adapted for interconnection with a threaded rod that is placed through an aperture provided in the floor panel. In addition, the floor panel may include a steel sheath embedded within the aperture to provide a location for a lifting device to be attached. More specifically, one embodiment of the present invention is a concrete floor panel having an internally positioned tube with a plurality of holes or other preferred geometric profile integrated therein. Lifting mechanisms such as a lift pin or bolt may be inserted into the lifting tube of the floor panel for engagement with the apertures or locking geometric profile. The lifting mechanism may then be removed from the apertures of the sheath after the floor panel is properly placed, and a connector rod or other attachment hardware inserted into the sheath during interconnection of the floor/roof panel to a wall panel.
As briefly mentioned above, the adjustable connector in one embodiment includes a captive nut. Once the floor panel is placed over the wall panel, with the aperture of the floor panel aligned with the adjustable connector embedded in the wall panel, a threaded rod is placed through the aperture. A nut is then threaded onto the rod and secured, thus substantially fixing the fabricated floor and wall panels together. Next, a combination of sand or other granular material and/or epoxy may be added to fill the aperture of the floor panel, thereby substantially preventing the infiltration of fluids and further strengthening the interconnection. Furthermore, the granular material has been found to provide increased stability during a seismic disturbance or high winds since rigidity between the floor panel and wall panel is reduced.
Alternatively, a hole may be field drilled into the wall panel prior to or after the floor panel is placed thereon. The field drilled hole provides a location for the insertion of a threaded or non-threaded rod, wherein epoxy is added therearound to ensure that the rod remains fixed. Thus, a threaded rod is provided that is fixed in the wall panel, and which resides in the floor panel that allows the wall panel to be substantially secured to the floor panel with a nut. This method of interconnecting the wall panel to the floor panel is slightly more labor intensive, since the hole must e drilled in the field because the odds of cracking or otherwise changing the floor panel are somewhat increased.
It is yet another aspect of the present invention to provide an interconnecting mechanism that is simplistic and cost effective to install. More specifically, the adjustable connector of one embodiment of the present invention is placed in the wall panel mold prior to the placing of concrete, wherein the connector is embedded adjacent to the upper edge of the finished wall panel. In addition, the lifting tube as previously described above, would be also set in the precast mold of the floor prior to the placement of concrete thus providing a finished product with the steel sheath in its predetermined location.
Thus, it is one aspect of the present invention to provide a method of interconnecting prefabricated wall and floor panels comprising:
providing a wall panel having an upper end, a lower end and an adjustable connection device embedded proximate to said upper end;
providing a floor panel having an aperture positioned proximate to at least one of a first end and a second end and including a metal sheath positioned therein that is adapted for selective interconnection with a lifting mechanism;
placing said floor panel atop said upper end of said wall panel wherein said aperture is generally aligned with said adjustable connection device;
inserting a threaded rod into said aperture after removal of said lifting mechanism; and
interconnecting said threaded rod to said adjustable connection device, wherein said floor panel and said wall panel are operably interconnected.
It is a further aspect of the present invention to provide a lift anchor adapted for lifting and securing a prefabricated wall panel to a prefabricated floor/roof panel, comprising:
a substantially hollow tube having a distinct internal profile which is adapted for selective interconnection with a lift pin, the hollow tube adapted for placement in said at least one prefabricated concrete floor panel and said prefabricated wall panel; and
a securement pin operably sized for positioning through said substantially hollow tube and for penetration into at least part of said at least one prefabricated concrete wall panel and said prefabricated floor panel.
The Summary of the Invention is neither intended nor should it be construed as being representative of the full extent and scope of the present invention. The present invention is set forth in various levels of detail in the Summary of the Invention as well as in the attached drawings and the Detailed Description of the Invention and no limitation as to the scope of the present invention is intended by either the inclusion or non-inclusion of elements, components, etc. in this Summary of the Invention. Additional aspects of the present invention will become more readily apparent from the Detail Description, particularly when taken together with the drawings.
BRIEF DESCRIPTION OF THE DRAWINGSThe accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and together with the general description of the invention given above and the detailed description of the drawings given below, serve to explain the principles of these inventions.
It should be understood that the drawings are not necessarily to scale. In certain instances, details that are not necessary for an understanding of the invention or that render other details difficult to perceive may have been omitted. It should be understood, of course, that the invention is not necessarily limited to the particular embodiments illustrated herein.
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To assist in the understanding of the invention, the following is a list of the components and numbering depicted in the drawings:
While an effort has been made to describe various alternatives to the preferred embodiment, other alternatives will readily come to mind to those skilled in the art. Therefore, it should be understood that the invention may be embodied in other specific forms without departing from the spirit or central characteristics thereof. Present examples and embodiments, therefore, are to be considered in all respects as illustrative and not restrictive, and the invention is not intended to be limited to the details given herein.
Claims
1. A method of interconnecting a first prefabricated wall panel to a floor panel, comprising:
- providing a wall panel having an upper end, a lower end and an adjustable connection device embedded proximate to said upper end;
- providing a floor panel having an aperture positioned proximate to at least one of a first end and a second end and including a metal sheath positioned therein that is adapted for selective interconnection with a lifting mechanism;
- placing said floor panel atop said upper end of said wall panel wherein said aperture is generally aligned with said adjustable connection device;
- inserting a threaded rod into said aperture after removal of said lifting mechanism; and
- interconnecting said threaded rod to said adjustable connection device, wherein said floor panel and said wall panel are operably interconnected.
2. The method of claim 1, further comprising filling said aperture in said floor panel and said metal sheath with a particulate matter.
3. The method of claim 2, wherein said particulate matter is sand.
4. The method of claim 1, further comprising filling said aperture in said floor panel and said metal sheath with at least one of an epoxy or a cement.
5. The method of claim 1, wherein said adjustable connection device comprises a threaded nut slidingly engaged within a channel, wherein said nut may be operably positioned to a plurality of positions.
6. The method of claim 5, wherein said threaded nut is biased within said channel to allow vertical movement therein.
7. The method of claim 1, wherein said lifting mechanism comprises at least one of a threaded rod, bolt, strap or clamp.
8. The method of claim 1, wherein said wall panel is comprised at least partially of a low density insulation material.
9. The method of claim 1, further comprising drilling a further portion of said floor panel in alignment with said metal sheath to create an aperture extending entirely through said floor panel.
10. A lift anchor adapted for lifting and securing at least one of a prefabricated concrete floor panel to a prefabricated concrete wall panel, comprising:
- a substantially hollow tube having a distinct internal profile which is adapted for selective interconnection with a lift pin, the hollow tube adapted for placement in said at least one prefabricated concrete floor panel and said prefabricated wall panel; and
- a securement pin operably sized for positioning through said substantially hollow tube and for penetration into at least part of said at least one prefabricated concrete wall panel and said prefabricated floor panel.
11. The lift anchor of claim 10, wherein said substantially hollow tube is comprised of a metallic material.
12. The lift anchor of claim 10, wherein said securement pan is comprised of at least one of a metallic material, a fiberglass material and a ceramic material.
13. The lift anchor of claim 10, further comprising an adjustable interconnection device positioned in said prefabricated concrete wall panel proximate to an upper end which is adapted for interconnection to said securement pin.
14. The lift anchor of claim 13, wherein said adjustable interconnection device comprises a biased nut capable of traveling between multiple positions.
15. The lift anchor of claim 10, wherein said at least one of said prefabricated concrete wall panel and said prefabricated concrete floor panel are partially comprised of a low density insulative material.
16. A method for interconnecting a first prefabricated wall panel to a second prefabricated wall panel, comprising:
- providing a first prefabricated wall panel with an upper end and a lower end;
- providing a connection device positioned proximate to an upper end of said first prefabricated wall panel;
- providing a second prefabricated wall panel with an upper end and a lower end, said lower end comprising an access pocket and an aperture extending downwardly therefrom in a substantially vertical direction which is adapted to receive a rod;
- positioning said lower end of said second prefabricated wall panel on said upper end of said first prefabricated wall panel, wherein said aperture is positioned proximate to said connection device;
- inserting said interconnection device into said aperture; and
- interconnecting said rod to said interconnection device; wherein said first prefabricated wall panel is operably interconnected to said second prefabricated wall panel.
17. The method of claim 16, further comprising utilizing a lift pin engaged to said interconnection device during said positioning of said first wall.
18. The method of claim 16, further comprising positioning a grout material in said aperture after interconnecting the rod to the interconnection device.
19. The method of claim 16, wherein said grout material is at least one of a sand, an epoxy and a cement.
20. The method of claim 16, further comprising interconnecting a prefabricated floor panel to said first prefabricated wall and said second prefabricated wall.
21. The method of claim 16, wherein said connection device comprises a receiver adapted to move between a plurality of positions.
22. The method of claim 21, wherein said receiver comprises a threaded nut which is biased in a substantially vertical direction.
Type: Application
Filed: Mar 31, 2006
Publication Date: Oct 26, 2006
Inventor: Harold Messenger (Rehoboth, MA)
Application Number: 11/395,533
International Classification: E04B 1/00 (20060101);