BACKGROUND OF THE INVENTION
Construction methods utilizing Cold-Form Steel (“CFS”) framing provides a cost-effective, versatile and reliable means of fabricating low-rise and mid-rise structures, such as those providing multi-unit housing and/or commercial space. CFS construction relies on the use of pre-fabricated panelized components to construct load-bearing walls and related support structures in framing a given building. CFS has also gained acceptance in the market due to the relatively short time frame in which large, complex structures can be designed and built (when compared to other conventional construction methods).
The CFS panelized components are fabricated from structural-quality steel that is roll-formed into support members that typically have an open rectangular or “C” shaped cross-section, thus creating relatively light-weight members that exhibit excellent rigidity and load-bearing characteristics. Various gauges of steel can be utilized in fabricating CFS components, thereby allowing particular components to be customized as a function of the loads and forces that will be placed upon in them in a given application.
As each particular level of a multi-story CFS building project is completed, flooring must be laid. Typically the flooring process for a CFS building involves the laying of prefabricated corrugated decking atop CFS framing. FIG. 1 provides a depiction of a typical CFS framed structure 100. As shown, three corrugated decking sections (102, 104 and 106) are secured atop CFS framing 108. The corrugated decking sections are typically bundled (110) and lifted via crane or other means so that they are placed atop of a CFS framing structure (100). Workers then manually separate the bundles decking sections and place and secure them (either via welding or fasteners) in the appropriate locations so as to complete the flooring of the CFS framing. This manual process is time consuming and can be quite hazardous as the particular CFS structure being floored may be many stories up. The need for workers to deliberately and carefully navigate the CFS framing while separating, placing and securing the decking sections only adds to the overall time required to complete the decking process. Once the deck is complete, it is typically covered in a layer of composite cement which will serve as load-bearing flooring in the CFS structure.
Given the time-consuming, and possibly hazardous nature of the manual process for separating, placing and securing the individual decking sections utilized in CFS construction, it would be desirable to provide a system and method that would ensure a safer working environment and speed the flooring process. Such a system and method would ideally utilize the same, readily available prefabricated corrugated decking. In addition, ideally the utilization of the system and method should not require any substantial retraining of workers, or the utilization of specialized tools by those workers.
BRIEF SUMMARY OF THE INVENTION
A system and method for rigging and lifting a joined, multi-section assembly of corrugated decking sections for attachment to a CFS structure. The system and method provide for the utilization of an adaptable rig that securely attaches to a multi-section assembly of corrugated decking sections which have be pre-joined by workers in a safe, preferably terrestrial, workspace. The adaptability of the rig enables it to provide attachment points for lifting and supporting the multi-sectioned decking assemblies of disparate sizes and materials. The location and number of these attachment points being a function of the size, gauge, area and aggregate weight of a given pre joined multi-section assembly. The system and method can be utilized with pre-joined multi-section assemblies consisting of individual decking sections fabricated from a variety of materials, including ferrous metals, non-ferrous metals and composite materials.
BRIEF DESCRIPTION OF THE DRAWINGS
The aspects, and advantages of the present invention will become better understood with regard to the following description, appended claims, and accompanying drawings in which:
FIG. 1 is a perspective view of a CFS structure and decking sections therefor, in accordance with the prior art.
FIG. 2A is a top view of a preferred embodiment of an adjustable rig.
FIG. 2B is an exploded top-view of the adjustable rig of FIG. 2A.
FIG. 2C is a longitudinal side-view of the adjustable rig of FIG. 2A.
FIG. 2D is an alternate side-view of the adjustable rig of FIG. 2A.
FIG. 3 is perspective view of a spacer affixed to a mating post on the adjustable rig of FIG. 2A.
FIG. 4A is perspective view of corrugated flooring panel and associated attachment assemblies suitable for use with the adjustable rig of FIG. 2A.
FIG. 4B is a top view of a joined assembly of ten corrugated flooring panels and the associated attachment assemblies suitable for use with the adjustable rig of FIG. 2A.
FIG. 5A is a longitudinal side-view of the rig of FIG. 2A connected to the assembly of FIG. 4B.
FIG. 5B is a top-view of the rig and assembly of FIG. 5A.
FIG. 6 is a top-view of the rig and assembly of FIG. 5A positioned above a CFS framing.
FIG. 7 provides an expanded top-view of a corrugated flooring panel connected to the rig of FIG. 2A.
FIG. 8A is a top-view of an alternate embodiment of an adaptable rig employing extended spacers.
FIG. 8B is a side-view if the rig of FIG. 8A.
FIG. 8C is an expanded view of a connection panel affixed to a spacer associated with the rig of FIG. 8A.
FIG. 8D is an expanded longitudinal side-view of the connection panel of FIG. 8C.
FIG. 9A is a top-view of an alternate embodiment of an adaptive rig wherein two spacers are utilized.
FIG. 9B is a top-view of an alternate embodiment of an adaptive rig wherein four spacers are utilized.
DETAILED DESCRIPTION
FIG. 2A is top view of adaptable rig 200, in accordance with a particular preferred embodiment of the invention. FIG. 2B provides an exploded top view and FIG. 2C a side view of the adaptable rig of FIG. 2A. As shown, adaptable rig 200 includes side rails 202 and 204. Affixed to each of these side rails are three orthogonal mating posts (206. 208 and 210 on rail 202; 212, 214 and 216 on rail 204). In this preferred embodiment the side rails measure 30′ in length and are fabricated from 1.5″ square tube of 0.25″ thick steel. The mating posts measure 1′ in length and are also fabricated from 1.5 inch square tubes of 0.25 thick steel. However the particular dimensions of the rails and tubes, as well as the thickness of the steel from which they are made can be chosen as a function of both the aggregate size and weight of the joined, multi-section assembly of corrugated decking sections which is to be lifted. In this embodiment, the mating posts are welded to the side rails, but other methods of connecting them, such as bolts or T-shaped metal housing could be utilized, as long as they were rated to withstand the loading and stresses that might be placed upon the rig and its components—Again, this would primarily be a function of both the aggregate size and weight of the joined, multi-section assembly of corrugated decking sections which is to be lifted.
Each of the side rails is connected to a side plate (plate 218 on side rail 202; plate 220 on side rail 204). Each of these plates is fabricated form a 30″ by 6″ plate of 0.1875″ thick steel. The plates are welded to the side rails in this embodiment, but other means of affixing them to the side rails could be employed (fasteners, bolts, etc.). As shown, each of the side plates as a series of holes. These holes are adapted to mate with a chain or cable that will be used to connect the adaptable rig to its load (joined, multi-section assembly of corrugated decking sections). Note that the particular means by which the side plates are affixed to the side rails is not particularly critical, so long as it is rated to withstand the stresses and loading associated the particular loads the rig will be lifting.
Adaptable rig 200 also includes three spacers (222, 224 and 226). In this preferred embodiment each of the spacers measure 4′ 10″ in length and are fabricated from 2.0″ square tube of 0.375″ thick steel. The particular dimensions of the spacers, as well as the thickness of the steel from which they are made can be chosen as a function of both the aggregate size and weight of the joined, multi-section assembly of corrugated decking sections which is to be lifted. However, the inner dimensions of the 2.0″ square steel tubing must be capable of accepting the insertion of a mating post. The post should be able to slide freely into and out of the spacer tube with little play front to back or side to side. For example, in this embodiment the outer dimensions of the mating posts are 1.5″ square. A suitable spacer tube would have an inner dimension of approximately 1.625″ square.
The adaptable rig is also shown to include rigging plates 228 and 230 (mounted upon side rail 202) and rigging plates 232 and 234 (mounted upon side rail 204. In this embodiment each of these rigging plates are fabricated from a 4″ square ¼″ thick steel plate with a centrally located hole. The rigging plates are welded onto the side rails and angled at approximately 45° (see FIG. 2D). The hole in each rigging plate is adapted to mate with a hook or other connector associated with a harness that will be used to lift the adaptable rig. The particular means by which the rigging plates are affixed to the side rails is not particularly critical, so long as it is rated to withstand the stresses and loading associated the particular loads the rig will be lifting.
FIG. 2A shows the mated components of 200. Each of mating posts (206, 208, 210, 212, 214 and 216) are inserted into a spacer tube (222, 224, 226). A mating post (302) is secured to a spacer (304) using a cotter pin, quick-release pin, nut and bolt, or similar fastener (306) that would be inserted into a channel (308) (approximately ⅜″ in diameter in this particular embodiment) that passes through both the spacer bar and the mating post (see FIG. 3). Note that the distance between the approximate center line of side rail 202 and the approximate centerline of side rail 204 has been denoted as d1. This distance is approximately 5′ in the pictured embodiment.
FIG. 4A provides a perspective view of a single corrugated decking section (402). Such decking sections are widely available and commonly used as a flooring component in CFS construction. Typically, such decking sections are available in 24″ and 36″ widths, and in lengths as long as 30′. Decking section 402, as depicted in FIG. 4A, has dimensions of approximately 36″ by 8′. As shown, there are two holes (404 and 406) in decking section 402. These are located along the longitudinal centerline (408) of decking section 402, spaced approximately distance d1 from each other, where d1 is the distance between the approximate center line of side rail 202 and the approximate centerline of side rail 204 (˜5′).
As also shown in FIG. 4A, each of two attachment assemblies (410 and 412) fabricated from ¼″ steel. Each attachment assembly includes a rigging eye (414, 416) which is attached to a threaded rod (418, 420). The threaded rod is fabricated from steel and has a diameter of approximately ½″ and a length of approximately 12″. The attachment assembly also includes a base plate (422, 424) measuring approximately 3″ by 18″ and fabricated from ¼″ steel, and center receptacle (426, 428), sized and threaded to mate with the threaded rods. To prepare a given corrugated decking section for connection to adaptable rig 200, the center rod of a rigging eye is threaded through each hole in the decking section, and the base plate is oriented so that it is approximately orthogonal to the centerline of the decking section. The threaded rod is then fastened to the center receptacle of the base plate. The particular dimensions and lengths of the attachment assembly is not particularly critical, so long as it is rated to withstand the stresses and loading associated the particular loads the rig will be lifting.
Multiple decking sections, and the associated attachment assemblies, are positioned adjacent to one another as shown in FIG. 4B. As shown ten decking sections (426, 428, 430, 432, 434, 436, 438, 440, 442 and 444) are situated so that they can be longitudinally joined to one another, thereby forming a single, joined multi-section assembly measuring approximately 8′ by 30′. The method of joining can be mechanical (clips, screws, rivets, etc.) or welding. The particular method may be prescribed by the manufacturer of the decking sections, or dictated by the particular conditions and requirements at a given job site. Ideally, the joined multi-section assembly (446) would be assembled on a large, stable, level working space, preferably located at ground level, so that workers could quickly and safely situate and join the decking sections.
As shown in FIG. 5A, once the decking sections have been joined, adaptable rig 200 is lifted by a crane or other suitable lifting apparatus (502), and positioned over the multi-section assembly (446) and the associated attachment assemblies (504). Each attachment assembly is then connected to adaptable rig 200 by a chain (ten of which are depicted in FIG. 5—506, 508, 510, 512, 514, 516, 518, 520, 522, 524). Fasteners would be situated at each end point of each chain to facilitate the quick attachment/detachment of the chain to a given attachment assembly and one of the holes in the adaptable rig's side plates (side plate 220 is depicted in FIG. 5A). These fasteners could be hooks, carabiners, etc. Note that the particular holes in side plate 220 utilized to mate with the chains are located at approximately a distance of d2 from one another. This distance is approximately equal to the width of an individual decking section (36″ in this embodiment). This promotes even tension among the multiple chains as the joined multi-section assembly is lifted, and stability of the adaptable rig as it is moved between the assembly site and the delivery point for the multi-section assembly. FIG. 5B provides a top view of adaptable rig 200 positioned over and connected to joined multi-section assembly 446.
As shown in FIG. 6, adaptable rig 200 and attached joined multi-section assembly 446 are then lifted by a crane (602), or other suitable lifting equipment, and positioned over and lowered onto a CFS framing (604). Once joined multi-section assembly 446 is properly positioned and resting upon CFS framing 604, the chains are disconnected from each of the 20 attachment assemblies associated with joined multi-section assembly 446, and the attachment assemblies are removed. Workers now have a large (8′×30′) stable platform measuring to stand upon while they perform the actions necessary to permanently attach joined multi-section assembly 446 to CFS framing 604.
For the lifting of the particular multi-section assembly discussed in the above embodiment, spacers having a length of 4′10″ were utilized. This resulted in the separation of the side panels of the adaptable rig being approximately 5′ apart from each other. Thus, for an 8′ long corrugated flooring section, with holes for attachment assemblies situated to align with the side panels spacing of 5′, each panel would extend approximately 1.5′ out and away from each attachment assembly base plate (702, 704) (see FIG. 7). This “overhang of 1.5 feet was chosen as it was the maximum permissible overhang recommended by the manufacturer of the corrugated flooring panels utilized in the above embodiment. However, this overhang will vary as a function of the gauge of material a given flooring panel Is fabricated from, as well as with the depth and configuration of the panel's corrugation.
As noted above, various flooring panel will have differing physical characteristics and dimensions (commercially-available corrugated flooring panels can have lengths that vary between 6′ and almost 30′). Consequently, to avoid excessive overhanging of the joined panels from the adaptable rig side panels, spacers of varying lengths may be employed to configure the adaptable rig. For example, as shown in FIG. 8A, the adaptable rig may be configured with three spacers (802, 804 and 806), each having a length of 14′10″. This would result in the side panels of the rig being separated from each other by a distance of approximately 15′. This extended adaptable rig configuration would be capable of lifting a 15′ by 30′ foot assembly of joined flooring panels. Such a large assembly would likely require additional attachment assembly to be utilized so that the interior regions of the assembly were properly supported. As shown in FIG. 8B, which provides a side view of spacer 806, situated between the side rails and side panels of the adaptable rig, multiple connection panels (808 and 810) are affixed (preferably by welding) to the underside of spacer 906. Each of these panels has a height, h, so that the bottom of each connection panel extends below spacer 906 so that it is even with the bottom of the adaptable rig's side panels. FIG. 8C provides an enlarged view of connection panel 808 to spacer 810. The longitudinal side-view of connection panel 808 provided in FIG. 8D illustrates that the connection panels can have a longitudinal dimension in excess of the cross-sectional dimension of spacer 810, and that multiple holes (812, 814 and 816), each adapted to mate with a chain or cable that will be used to connect the adaptable rig to its load, are provided for in the connection panel. (not currently part of the system, but keep in if you suggest for future flexibility)
In addition, other alternate embodiments of the adaptable rig can include varying numbers of mating posts and spacers, depending upon the weight and rigidity of the particular joined multi-section assemblies that will be lifted. For example, FIG. 9A depicts adaptable rig 900A wherein each side rail (902, 904) has only two mating posts (906, 908 and 910, 912), and consequently only two spacers (914, 916) are required. FIG. 9B depicts adaptable rig 900B wherein each side rail (918, 920) has four mating posts (922, 924, 926, 928 and 930, 932, 934, 936), and consequently requires four spacers (938, 940, 942, 944).
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. For example, the attachment means could include an electromagnet or suction device adapted to latch on to and/or grasp the surface of one or more flooring panels. The holes for mating with the attachment rigs (or sites where an electromagnet or a suction device might grasp the surface of a flooring component) need not be present in every flooring component that the adaptable rig is lifting. The material, thickness and/or rigidity of the flooring components could permit such holes or grasping sites to be located upon every other, or every forth flooring component. In addition, the invention is not limited to use in a CFS framing environment. It will be understood that the disclosed adaptive rigs could be utilized in any situation or environment requiring the lifting and placement of joined building elements that require a multi-point, distributed lifting apparatus. All of the above variations, and reasonable extensions thereof, could be implemented and practiced without departing from the spirit and scope of the present invention as defined by the appended claims.
Patent Application
20240159042
