CA2033556A1 - Apparatus for forming voids in concrete and method of use thereof - Google Patents
Apparatus for forming voids in concrete and method of use thereofInfo
- Publication number
- CA2033556A1 CA2033556A1 CA 2033556 CA2033556A CA2033556A1 CA 2033556 A1 CA2033556 A1 CA 2033556A1 CA 2033556 CA2033556 CA 2033556 CA 2033556 A CA2033556 A CA 2033556A CA 2033556 A1 CA2033556 A1 CA 2033556A1
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- Prior art keywords
- concrete
- baseplate
- sleeve
- deck
- baseplates
- Prior art date
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Abstract
ABSTRACT OF THE DISCLOSURE
An apparatus for forming voids in concrete and the method of using the apparatus. The apparatus includes baseplates secured to a wood supporting deck or form for a concrete floor by a plurality of removable screws in a location determined by the plans of the concrete floor which usually requires the formation of various voids, cavities, openings or holes in the floor and a removable sleeve attached to each baseplate and having a height generally equal to the thickness of the floor with the upper end of the sleeve being accessible and observable when concrete is poured. In using the apparatus, the baseplates are affixed to the wood deck in accordance with the plans for the floor after the wood deck has been placed in position to receive poured concrete. After the baseplates have been secured in place, various subsequent work procedures may be carried out without the workers encountering obstructions that would exist if upwardly projecting cavity forming members were attached to the wood deck. Such work procedures include the positioning of reinforcing bars, cables and the like which have a tendency to dislodge and damage any upward projections on the wood deck. After all work procedures have been performed on the wood deck, including positioning of rebars, a sleeve is attached to each baseplate immediately prior to pouring concrete thereby eliminating the problem of upwardly projecting cavity forming members on the wood deck being displaced or damaged during work procedures prior to pouring concrete. After the concrete has been poured and set, the sleeves are detached from the baseplates and removed.
The wood deck can then be stripped from the bottom of the concrete floor with the baseplates still attached thereto. The baseplates are then removed from the wood deck panels and the baseplates and sleeves are capable of reuse. In other situations, The baseplates can be detached from the wood deck before the wood deck is stripped by using a long screwdriver to remove the screws after which the baseplate can be lifted out of the cavity. If a "flying form" is used, the baseplates can remain attached to the deck.
An apparatus for forming voids in concrete and the method of using the apparatus. The apparatus includes baseplates secured to a wood supporting deck or form for a concrete floor by a plurality of removable screws in a location determined by the plans of the concrete floor which usually requires the formation of various voids, cavities, openings or holes in the floor and a removable sleeve attached to each baseplate and having a height generally equal to the thickness of the floor with the upper end of the sleeve being accessible and observable when concrete is poured. In using the apparatus, the baseplates are affixed to the wood deck in accordance with the plans for the floor after the wood deck has been placed in position to receive poured concrete. After the baseplates have been secured in place, various subsequent work procedures may be carried out without the workers encountering obstructions that would exist if upwardly projecting cavity forming members were attached to the wood deck. Such work procedures include the positioning of reinforcing bars, cables and the like which have a tendency to dislodge and damage any upward projections on the wood deck. After all work procedures have been performed on the wood deck, including positioning of rebars, a sleeve is attached to each baseplate immediately prior to pouring concrete thereby eliminating the problem of upwardly projecting cavity forming members on the wood deck being displaced or damaged during work procedures prior to pouring concrete. After the concrete has been poured and set, the sleeves are detached from the baseplates and removed.
The wood deck can then be stripped from the bottom of the concrete floor with the baseplates still attached thereto. The baseplates are then removed from the wood deck panels and the baseplates and sleeves are capable of reuse. In other situations, The baseplates can be detached from the wood deck before the wood deck is stripped by using a long screwdriver to remove the screws after which the baseplate can be lifted out of the cavity. If a "flying form" is used, the baseplates can remain attached to the deck.
Description
~3~
APPARATUS FOR FORMING VOIDS IN CONCRE~E
AND MEI'HOD OF USE THEREOF
The present invention generally r~lates to the constructian of concrete floors or other concrete bodies and more specifically an apparatus for ~orming voids in concrete and the method o~ using the apparatus. The lo apparatus includes bas~plates secured to a wood supporting deck or form for a concrete floor by a plurality of removable screws in a location determined by the plans of the concrete floor which usually re~uires th~ formation o~ various voids, cavities, openings or holes in the ~loor and a removable sleeve attached to each baseplate and having a height generally equal to th~
thickness o~ the floor with the upper end o~ the sleeve being accessible and observable when concrete is poured.
In using the apparatus, the baseplates are affixed to the ~o wood deck in accordance with the plans for the floor after the wood deck has been placed in position to receive poured concrete. After the baseplates have been sscured in place, various subseguent work procedures may be carried out without the workers encounteriny obstructions that would exist if upwardly projecting cavity fo~ming members were attached to the wood deck.
Such work procedures include the positioning of reinforcing baræ, cables and the like whiah have a tendsncy to dislodg~ and damage any upward pro~ections on the wo~d deck. After all work procedures have been performed on the wood deck, including positioning of rebars, a sleeve is attached to each baseplate immediately prior to pourlng concrste there~y eliminating the problem of upwardly pro~ecting cavity ~orming members on the wood deck being displaced or damaged during work procedures prior to pouring concreteO After the concrete has been poured and set, the sleeves are detached Erom the baseplates and removed. The wood deck can then be stripped from the bottom of the concrete ~loor with the baseplates still attached thereto. The baseplates are then removed from the wood deck panels and the baseplates 0 and sleeves are capable of reuseO Xn other situations, the baseplates can be detached from the wood deck before the wood deck is stripped hy using a long screwdriver to remove the screws after which the ba~eplate can be lifted out of the cavity. Xf a "Ilying ~orm" is used, the baseplates can remain attach~d to the deck.
In present day building structures, it is necessary to form voids or openings in concrete floors when the floors are poured~ The openin~s in concrete floors are necessary to receive ~ables, wiring, plumbing and the like which is in~talled in the building after all of the concrete floors have been ~ormed. Various ef~orts have been made to fo~m the voids or openings including the provision of sleeve structures and the like that are attached to the wood deck onto which the concrete floor is to be poured with these sleeve members projecting upwardly ~rom the wood deck thereby forming obstructions to workers who ar~ per~orming various work procedures on the wood deck including workers that are positioning rebars. It frequently occurs that the upwardly projecting cleeves are damaged or displaced during various work procedures and th~ upwardly pro~ecti~g -~ ~ 3 ~
sleeve~ also form obstructions over which workers can trip and ~all with resultant injury.
The following U.S. patents disclose various structures endeavoring to provide voids or openinys in a concrete 5 floor:
Re 31,598 762,194 1,391,~88 1,746,69 0 2,24g,824 2,694,847 While such prior art devices are related to the formation of voids or cavities in a concrete deck, none of them utilize the specific structure and method of this in~ention since none of those patents disclose baseplates secured to a wood deck prior to placement of rebars thereon with the sleeves being attached to the baseplates ~ust prior to pouring concrete with the sleeves being removed from the upper surface of the set concrete after which the wood deck is separated from the concrete floor and the baseplates removed from the deck a~ter the deck has been removed from the bottom surface of the set concrete thereby enabling reuse of the baseplakes and sleeves. Tapering of sleeves provides a cavity that is larger at the top than at the bottom thereby making it easier to fill the cavity with fireproof materials to the required levels.
An object of the present invention is to provide an apparatus for ~orming openin~s in a concr~te ~loor or other concrete body in which the apparatus include~
recoverable and reusable components as well as a uni~ue method o~ using the apparatus to more ef~ectiYely and accurately form openings throu~h a concrete floor or other concrete body.
~ nother object of the invantion is to provide an apparatus in accordance with the preceding objec~ in which the apparatus includes ba eplates secured to a wood deck for a concrete Ploor or a ~orm member which supports and engages a concrete mixture or other hardenable mixture which i~ placed on the wood deck or ~orm member 15 prior to work procedures being performed i~ adjacent relation to the baseplates and subsequently placing a sleev~ on each baseplate and conne~ting it thereto i~mediately prior to pouring the concrete mixture or similar p~urable and hardenable material against the wood deck or form member with the ~leeves being removable after the concrete mixture or other hardenable mixture has set or hardened with the baseplates being removed from the wood deck or form member before or after separa-tion from the hardened ~loor or concreke body thereby ~ 3 enabling reuse of the baseplates and sleeve6.
A ~urther object of the invention is to provide an apparatus and method as set ~orth in th~ preceding objects in which each baseplate iB secured to the wood deck or form member by conventional screws and the sleeve is secured to the bas~plate in enclosing r~lation thereto by a rod or ~olt h~ving screw threaded components associated with the baseplate and sleeve to secure the sleeve fixedly to the baseplate and to move the sleeve away from the baseplate to facilitate extraction of the sleeve ~rom the concrete ~loor or body a~ter it hardens.
These together with other objecks and advantages which will become subsequently appar~nt reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings ~orming a part hereof, wherein like numerals refer to like parts throughout.
Figure 1 is a ~ectional view o~ th~ apparatus of 2Q the present invention in assembled relation with a concre~e floor and rebaxs associated therewith.
Figure 2 is a transverse~ sectional Yiew~ on an enlarged scale, taken substantially upon a plane passing along section line 2-2 on Fig. 1.
Figure 3 is a transYerse, ~ctional view, on an enlarged sc~le, taken ~ubstantially upon a plane p~sing along section line 3-3 on Fig. 1 illustrating the structura o~ the baseplate.
Figure 4 i~ a ~chematic, elevational view illustrating the 1nitial arrangement of the ba~eplate on the wood deck and illustrating the ~anner in which rebars can be assembled without inter~erence ~rom upward projections on the wood deck.
~7igure 5 is a schemakic, sectional view illustrating assembly of the sleeve with the baseplate immediately prior to pouring concrete.
Fi~ure 6 is a top plan view o~ the sleeve and retaining rod or bolt.
Referring now ~pecifically to the drawings, the apparatus for forming void~ or ~avities in a concrete floor or other concrete body i~ generally designated by reference numeral 10 and includes a baseplatP 12, a tubular sleeve 14 and a sl~eYe retaining bolt or rod 16 with these components being associated with a wood floor deck 18 which is a ~orm me~ber that supports and engages concrete 20 ~uch as a concre~e ~loor when it i~ poured when forming a building structure. The wood floor deck 18 conventiGnally employed for thi~ purpos~ is constructed from plywood pan~ls suppor-ted by a suitable fram.ing structure. When forming concrete ~loors, it is necessary to provide voids, cavities or openings 22 S therethrough to receive cables, wiring, plumbing and the like which is installed a~ter the concrete floor has been constructed.
When a concrete floor i5 to be poured, the wood deck 18 is assembled in a manner to form a substantially planar upper surface that is horizontally disposed. In conventional practice, a plurality of upwardly projecting void or opening forming members are attached to the wooden deck in accordance with the plans for the floor.
Various work procedures are then performed by workers who find it necessary to walk along the surface of the wood deck and the upwardly projecting members form obstructions which can impede a worker's progress and, in some instances, trip the worker and cause the worker to fall. Also, when installing r~bars, it frequently occurs that the rebars contact the upwardly projecting members and displace them from the desired position or, in some instances, bend or deform the opening defining members and the upwardly projecting members form an obstruction to location and movement o~ the rebars when laying them in desired position and anchoring them in that position~
In many instanc~s, the upwardly projecting members become a permanent part of the concrete floor since they are attached to the wood deck with nails which hold the upwardly projecting members in place but still enable the wooden deck to be separated from the bottom surface of the concrete floor after it hardens. If the co~ventional upwardly extending member i5 displaced~ tilted, bent or punctured, the void or cavity will be lost thus necessitating the ~loor to be core drilled in order to form the void. If post tensioned cable is used in the floor, it is necessary to use an expensive X-ray procedure to avoid damage to the cables.
In the present invention, the baseplate 12 is in the form of a circular plate 24 constructed of plastic material or the like that i~ provided with a plurality of locating notches 26 in the periphery thereof which are aligned with chalk lines for proper positioning. The plate 24 also is provided with three equally spaced apertures 28 receiving fastener screws 30 which secure the plastic ~aseplate or mounting plate 24 to the wood deck 18 with the heads of the screws 30 being countersunk into the top surface of the plate 24. Embedded in and rigidly secured to the plate 24 is a metallic nut 32 ~3~
which may be in the form of a hex nut that is internally threaded and provided with an external groove 34 which anchors the nuk 32 ln the plastic baseplate 24 when the baseplate and nut ara injection molded together or formed by sonic welding or other conventional techniques~ Thus, the baseplate 12 which includes the plastic plate 24 and the hexagonal nut 32 of aluminum or other metal].ic material is easily attached to the wood deck 18 by using the screws 30 and the thickness of the baseplate 12 is lo such that it will not produce upwardly extending projections that have a h~ight generally equal to the thickness o~ the concrete floor. Rather, the projection is very shallow and will enable workers to traverse the wood ~loor wh~n mounted thereon. The short height o~ the baseplate also enabl~s th~ rein~orcing bars 36 to be oriented in desired relation, usually in a grid pattern as illustrated in Fig~ 4 which shows the baseplate 12 secured to the wood deck 18 and also shows the next step in the operation in which the rebars 36 have been positioned in their desired relationship.
The sleeve 14 is mounted on the baseplate 12 and includes a generally cylindrical plastic wall 38 and a plastic circular top wall 40 o~ unitary construction with the cylindrical wall 38. The bottom end of the wall 38 ' lo is open and closely t~lescopes over the periphery of the baseplate 12 as illustrated in Figs. 1, 3 and 5 and tightly contacts deck 18. The generally cylindrical wall 38 i5 provided with a draft in the form of a 1 taper from top to bottom with the bottom being ~maller to facilitate extraction from the void Z2 in the concreke ~loor 20 when it i5 desired to remove the sleeve 14 ~rom the cavity to form a void or opening 22. The sleeve 14 is secured to the baseplate 12 by the retaining bolt or rod 16 which 0 includes an elongated rod 46 having an externally threaded lower end 48 screw threaded into the hex nut 32 and an externally threaded upper end 50 extending through an opening or hole 42 in the top wall 40 of the sleeve 14. Mount~d on the inner or lower end of the threaded upper end 50 i5 an internally threaded nut 56 which is screw threaded onto the threaded portion 50 all the way to the lower end thereo~ and which cooperates with a washer 44 to ~acilitate extraction o~ the sleeve 14 in a manner described hereinafter. Threaded onto the top end of the threaded upper end 50 is an internally threaded nut 58 which engages a washer 52 in contact with the upper surface of the top wall 40 of the sleeve 14 to hold the lower end against the wooden deck 18. The upper end of the bolt or rod above the upper end 50 is provided '?,1~3tje3 with a polygonal projection 60 that has oppo3ing ~lat sur~aces 62 to enable a wrench to be engaged therewith for rotating the bolt or rod 16 during assembly and disassem~ly of the sleeve 14 and ~olt or rod 16 in relation to the baseplate 12. The elongated rod 46 also can be reattached to the baseplate 12 after the sleeve 14 has been removed to enable the baseplate 12 to be xemoved through the cavity 22 after the screws 30 have been removed but prior to stripping the wooden deck lB~
10After the baseplates 12 have heen assembled onto the wood deck 18 and all work procedures, including positioning of the rebars 36, has been completed, a sle4ve 14 is assembled onto each baseplate immediately prior to pouring concrete. This is accomplished by first threading the lower threaded end 48 of the rod or bolt 46 into the nut 32 resulting in the arxangement i~lustrated in Fiq. 4. The sleeve 14 is then positio~ed over the - bolt or rod 46 and slid down over the rod 46 until the lower end of the wall 38 engages the upper surface o~ the floor deck ~8 with the dimensional characteristics of these components being such that the nut 56 will be spaced below the top wall 40 a relatively short distance.
~he nut 5~ is then positioned on the threaded end 50 of tha rod 46 along with washer 52 to secure the sleeve 14 tightly against khe deck 18. A~ter this assembly has been completed, the concrete is then poured onto the floor deck 18 to an elevation completely enclosiny all of the rebars 36. The vertical height of the sleeve 14 is 5 such that the top wall 40 will be spaced slightly above the upper surface 62 of the concrete ~loor 20. After the concrete floor has set or hardened, a wrench i5 engaged with the flattened sur~aces 62 on the extension 60 and the rod 46 is rotated in a manner to unscrew it from the o nut 32. In some instances, the nut 58 may be loosened or removed prior to rotating the bolt or rod 46. ln any event, rotation o~ the rod or bolt 46 will cause the - washer 44 and nut 56 to move upwardly to contact the undersurface o~ top wall 40 so that continued rotation o~
the bolt 46 will cause the bolt to move upwardly thus exerting an upward thrust on the sleeve 14 thereby extracting the sleeve ~rom the concrete floor 20 thus leaving a void, cavity or opening 22 completely through the concrete ~loor. As is conventional, after the concrete floor has set for a predetermined period of time, the wood ~loor deck 18 is separated from the bottom urface of the concrete ~loor 20. After the wooden deck has been separated, the baseplates 12 can be removed by removing the screws 30 thereby providing reusable ~ ~3 S ~ ~ r V ~
baseplates 12 and reusable sleeves 14 and rods or bolts 16 for use in formi~g voids or openings in other concrete ~loors or other concre'ce ~lo~r areas. Alternakively, the baseplates 12 may be removed through the voids 22 prior to stripping the deck 18 by removing screws 30 and using the rod 46 to lift the ba~eplates 1~ ~rom the voids 22.
With this arrangement o~ apparatus and the method as defined, the entire apparatus is reusable and is attached to the wood deck and separated therefrom by 0 the use of only three screws. The components may be constructed in various sizes depending upon installation requirements. Assembly o~ the sleeves onts the baseplat~s that have been installed when the deck is laid out ~rom the floor plans enables all work procedures to be performed without cncountering vertically elongated obstructions thuæ greatly ~acilitating the effective completion of various work procedures including the installation of rebars. The sleeve and baseplate being constructed of plastic material provides a structure that i~ much stronger than presently used item~ and enables the device to be easily cleaned and is less hazardous to use as well as being easy to assemble and disassemble.
The sleeve 14 and the bolt or rod 16 can be assembled in relation to each other and le~t in assembled condition by .
leaving the nut 58 on the screw threaded upper end 50 of the bolt or rod 46 thereby even further reducing the number o~ loose components encountered when installing the sleeve 14 in relation to the baseplate 12.
The foregoing is con~idered as illustrative only of the principle~ of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown 0 and described, and, accordingly, all suitable modifications and equivalents may be resorted to, ~alling within the scope of the invention.
APPARATUS FOR FORMING VOIDS IN CONCRE~E
AND MEI'HOD OF USE THEREOF
The present invention generally r~lates to the constructian of concrete floors or other concrete bodies and more specifically an apparatus for ~orming voids in concrete and the method o~ using the apparatus. The lo apparatus includes bas~plates secured to a wood supporting deck or form for a concrete floor by a plurality of removable screws in a location determined by the plans of the concrete floor which usually re~uires th~ formation o~ various voids, cavities, openings or holes in the ~loor and a removable sleeve attached to each baseplate and having a height generally equal to th~
thickness o~ the floor with the upper end o~ the sleeve being accessible and observable when concrete is poured.
In using the apparatus, the baseplates are affixed to the ~o wood deck in accordance with the plans for the floor after the wood deck has been placed in position to receive poured concrete. After the baseplates have been sscured in place, various subseguent work procedures may be carried out without the workers encounteriny obstructions that would exist if upwardly projecting cavity fo~ming members were attached to the wood deck.
Such work procedures include the positioning of reinforcing baræ, cables and the like whiah have a tendsncy to dislodg~ and damage any upward pro~ections on the wo~d deck. After all work procedures have been performed on the wood deck, including positioning of rebars, a sleeve is attached to each baseplate immediately prior to pourlng concrste there~y eliminating the problem of upwardly pro~ecting cavity ~orming members on the wood deck being displaced or damaged during work procedures prior to pouring concreteO After the concrete has been poured and set, the sleeves are detached Erom the baseplates and removed. The wood deck can then be stripped from the bottom of the concrete ~loor with the baseplates still attached thereto. The baseplates are then removed from the wood deck panels and the baseplates 0 and sleeves are capable of reuseO Xn other situations, the baseplates can be detached from the wood deck before the wood deck is stripped hy using a long screwdriver to remove the screws after which the ba~eplate can be lifted out of the cavity. Xf a "Ilying ~orm" is used, the baseplates can remain attach~d to the deck.
In present day building structures, it is necessary to form voids or openings in concrete floors when the floors are poured~ The openin~s in concrete floors are necessary to receive ~ables, wiring, plumbing and the like which is in~talled in the building after all of the concrete floors have been ~ormed. Various ef~orts have been made to fo~m the voids or openings including the provision of sleeve structures and the like that are attached to the wood deck onto which the concrete floor is to be poured with these sleeve members projecting upwardly ~rom the wood deck thereby forming obstructions to workers who ar~ per~orming various work procedures on the wood deck including workers that are positioning rebars. It frequently occurs that the upwardly projecting cleeves are damaged or displaced during various work procedures and th~ upwardly pro~ecti~g -~ ~ 3 ~
sleeve~ also form obstructions over which workers can trip and ~all with resultant injury.
The following U.S. patents disclose various structures endeavoring to provide voids or openinys in a concrete 5 floor:
Re 31,598 762,194 1,391,~88 1,746,69 0 2,24g,824 2,694,847 While such prior art devices are related to the formation of voids or cavities in a concrete deck, none of them utilize the specific structure and method of this in~ention since none of those patents disclose baseplates secured to a wood deck prior to placement of rebars thereon with the sleeves being attached to the baseplates ~ust prior to pouring concrete with the sleeves being removed from the upper surface of the set concrete after which the wood deck is separated from the concrete floor and the baseplates removed from the deck a~ter the deck has been removed from the bottom surface of the set concrete thereby enabling reuse of the baseplakes and sleeves. Tapering of sleeves provides a cavity that is larger at the top than at the bottom thereby making it easier to fill the cavity with fireproof materials to the required levels.
An object of the present invention is to provide an apparatus for ~orming openin~s in a concr~te ~loor or other concrete body in which the apparatus include~
recoverable and reusable components as well as a uni~ue method o~ using the apparatus to more ef~ectiYely and accurately form openings throu~h a concrete floor or other concrete body.
~ nother object of the invantion is to provide an apparatus in accordance with the preceding objec~ in which the apparatus includes ba eplates secured to a wood deck for a concrete Ploor or a ~orm member which supports and engages a concrete mixture or other hardenable mixture which i~ placed on the wood deck or ~orm member 15 prior to work procedures being performed i~ adjacent relation to the baseplates and subsequently placing a sleev~ on each baseplate and conne~ting it thereto i~mediately prior to pouring the concrete mixture or similar p~urable and hardenable material against the wood deck or form member with the ~leeves being removable after the concrete mixture or other hardenable mixture has set or hardened with the baseplates being removed from the wood deck or form member before or after separa-tion from the hardened ~loor or concreke body thereby ~ 3 enabling reuse of the baseplates and sleeve6.
A ~urther object of the invention is to provide an apparatus and method as set ~orth in th~ preceding objects in which each baseplate iB secured to the wood deck or form member by conventional screws and the sleeve is secured to the bas~plate in enclosing r~lation thereto by a rod or ~olt h~ving screw threaded components associated with the baseplate and sleeve to secure the sleeve fixedly to the baseplate and to move the sleeve away from the baseplate to facilitate extraction of the sleeve ~rom the concrete ~loor or body a~ter it hardens.
These together with other objecks and advantages which will become subsequently appar~nt reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings ~orming a part hereof, wherein like numerals refer to like parts throughout.
Figure 1 is a ~ectional view o~ th~ apparatus of 2Q the present invention in assembled relation with a concre~e floor and rebaxs associated therewith.
Figure 2 is a transverse~ sectional Yiew~ on an enlarged scale, taken substantially upon a plane passing along section line 2-2 on Fig. 1.
Figure 3 is a transYerse, ~ctional view, on an enlarged sc~le, taken ~ubstantially upon a plane p~sing along section line 3-3 on Fig. 1 illustrating the structura o~ the baseplate.
Figure 4 i~ a ~chematic, elevational view illustrating the 1nitial arrangement of the ba~eplate on the wood deck and illustrating the ~anner in which rebars can be assembled without inter~erence ~rom upward projections on the wood deck.
~7igure 5 is a schemakic, sectional view illustrating assembly of the sleeve with the baseplate immediately prior to pouring concrete.
Fi~ure 6 is a top plan view o~ the sleeve and retaining rod or bolt.
Referring now ~pecifically to the drawings, the apparatus for forming void~ or ~avities in a concrete floor or other concrete body i~ generally designated by reference numeral 10 and includes a baseplatP 12, a tubular sleeve 14 and a sl~eYe retaining bolt or rod 16 with these components being associated with a wood floor deck 18 which is a ~orm me~ber that supports and engages concrete 20 ~uch as a concre~e ~loor when it i~ poured when forming a building structure. The wood floor deck 18 conventiGnally employed for thi~ purpos~ is constructed from plywood pan~ls suppor-ted by a suitable fram.ing structure. When forming concrete ~loors, it is necessary to provide voids, cavities or openings 22 S therethrough to receive cables, wiring, plumbing and the like which is installed a~ter the concrete floor has been constructed.
When a concrete floor i5 to be poured, the wood deck 18 is assembled in a manner to form a substantially planar upper surface that is horizontally disposed. In conventional practice, a plurality of upwardly projecting void or opening forming members are attached to the wooden deck in accordance with the plans for the floor.
Various work procedures are then performed by workers who find it necessary to walk along the surface of the wood deck and the upwardly projecting members form obstructions which can impede a worker's progress and, in some instances, trip the worker and cause the worker to fall. Also, when installing r~bars, it frequently occurs that the rebars contact the upwardly projecting members and displace them from the desired position or, in some instances, bend or deform the opening defining members and the upwardly projecting members form an obstruction to location and movement o~ the rebars when laying them in desired position and anchoring them in that position~
In many instanc~s, the upwardly projecting members become a permanent part of the concrete floor since they are attached to the wood deck with nails which hold the upwardly projecting members in place but still enable the wooden deck to be separated from the bottom surface of the concrete floor after it hardens. If the co~ventional upwardly extending member i5 displaced~ tilted, bent or punctured, the void or cavity will be lost thus necessitating the ~loor to be core drilled in order to form the void. If post tensioned cable is used in the floor, it is necessary to use an expensive X-ray procedure to avoid damage to the cables.
In the present invention, the baseplate 12 is in the form of a circular plate 24 constructed of plastic material or the like that i~ provided with a plurality of locating notches 26 in the periphery thereof which are aligned with chalk lines for proper positioning. The plate 24 also is provided with three equally spaced apertures 28 receiving fastener screws 30 which secure the plastic ~aseplate or mounting plate 24 to the wood deck 18 with the heads of the screws 30 being countersunk into the top surface of the plate 24. Embedded in and rigidly secured to the plate 24 is a metallic nut 32 ~3~
which may be in the form of a hex nut that is internally threaded and provided with an external groove 34 which anchors the nuk 32 ln the plastic baseplate 24 when the baseplate and nut ara injection molded together or formed by sonic welding or other conventional techniques~ Thus, the baseplate 12 which includes the plastic plate 24 and the hexagonal nut 32 of aluminum or other metal].ic material is easily attached to the wood deck 18 by using the screws 30 and the thickness of the baseplate 12 is lo such that it will not produce upwardly extending projections that have a h~ight generally equal to the thickness o~ the concrete floor. Rather, the projection is very shallow and will enable workers to traverse the wood ~loor wh~n mounted thereon. The short height o~ the baseplate also enabl~s th~ rein~orcing bars 36 to be oriented in desired relation, usually in a grid pattern as illustrated in Fig~ 4 which shows the baseplate 12 secured to the wood deck 18 and also shows the next step in the operation in which the rebars 36 have been positioned in their desired relationship.
The sleeve 14 is mounted on the baseplate 12 and includes a generally cylindrical plastic wall 38 and a plastic circular top wall 40 o~ unitary construction with the cylindrical wall 38. The bottom end of the wall 38 ' lo is open and closely t~lescopes over the periphery of the baseplate 12 as illustrated in Figs. 1, 3 and 5 and tightly contacts deck 18. The generally cylindrical wall 38 i5 provided with a draft in the form of a 1 taper from top to bottom with the bottom being ~maller to facilitate extraction from the void Z2 in the concreke ~loor 20 when it i5 desired to remove the sleeve 14 ~rom the cavity to form a void or opening 22. The sleeve 14 is secured to the baseplate 12 by the retaining bolt or rod 16 which 0 includes an elongated rod 46 having an externally threaded lower end 48 screw threaded into the hex nut 32 and an externally threaded upper end 50 extending through an opening or hole 42 in the top wall 40 of the sleeve 14. Mount~d on the inner or lower end of the threaded upper end 50 i5 an internally threaded nut 56 which is screw threaded onto the threaded portion 50 all the way to the lower end thereo~ and which cooperates with a washer 44 to ~acilitate extraction o~ the sleeve 14 in a manner described hereinafter. Threaded onto the top end of the threaded upper end 50 is an internally threaded nut 58 which engages a washer 52 in contact with the upper surface of the top wall 40 of the sleeve 14 to hold the lower end against the wooden deck 18. The upper end of the bolt or rod above the upper end 50 is provided '?,1~3tje3 with a polygonal projection 60 that has oppo3ing ~lat sur~aces 62 to enable a wrench to be engaged therewith for rotating the bolt or rod 16 during assembly and disassem~ly of the sleeve 14 and ~olt or rod 16 in relation to the baseplate 12. The elongated rod 46 also can be reattached to the baseplate 12 after the sleeve 14 has been removed to enable the baseplate 12 to be xemoved through the cavity 22 after the screws 30 have been removed but prior to stripping the wooden deck lB~
10After the baseplates 12 have heen assembled onto the wood deck 18 and all work procedures, including positioning of the rebars 36, has been completed, a sle4ve 14 is assembled onto each baseplate immediately prior to pouring concrete. This is accomplished by first threading the lower threaded end 48 of the rod or bolt 46 into the nut 32 resulting in the arxangement i~lustrated in Fiq. 4. The sleeve 14 is then positio~ed over the - bolt or rod 46 and slid down over the rod 46 until the lower end of the wall 38 engages the upper surface o~ the floor deck ~8 with the dimensional characteristics of these components being such that the nut 56 will be spaced below the top wall 40 a relatively short distance.
~he nut 5~ is then positioned on the threaded end 50 of tha rod 46 along with washer 52 to secure the sleeve 14 tightly against khe deck 18. A~ter this assembly has been completed, the concrete is then poured onto the floor deck 18 to an elevation completely enclosiny all of the rebars 36. The vertical height of the sleeve 14 is 5 such that the top wall 40 will be spaced slightly above the upper surface 62 of the concrete ~loor 20. After the concrete floor has set or hardened, a wrench i5 engaged with the flattened sur~aces 62 on the extension 60 and the rod 46 is rotated in a manner to unscrew it from the o nut 32. In some instances, the nut 58 may be loosened or removed prior to rotating the bolt or rod 46. ln any event, rotation o~ the rod or bolt 46 will cause the - washer 44 and nut 56 to move upwardly to contact the undersurface o~ top wall 40 so that continued rotation o~
the bolt 46 will cause the bolt to move upwardly thus exerting an upward thrust on the sleeve 14 thereby extracting the sleeve ~rom the concrete floor 20 thus leaving a void, cavity or opening 22 completely through the concrete ~loor. As is conventional, after the concrete floor has set for a predetermined period of time, the wood ~loor deck 18 is separated from the bottom urface of the concrete ~loor 20. After the wooden deck has been separated, the baseplates 12 can be removed by removing the screws 30 thereby providing reusable ~ ~3 S ~ ~ r V ~
baseplates 12 and reusable sleeves 14 and rods or bolts 16 for use in formi~g voids or openings in other concrete ~loors or other concre'ce ~lo~r areas. Alternakively, the baseplates 12 may be removed through the voids 22 prior to stripping the deck 18 by removing screws 30 and using the rod 46 to lift the ba~eplates 1~ ~rom the voids 22.
With this arrangement o~ apparatus and the method as defined, the entire apparatus is reusable and is attached to the wood deck and separated therefrom by 0 the use of only three screws. The components may be constructed in various sizes depending upon installation requirements. Assembly o~ the sleeves onts the baseplat~s that have been installed when the deck is laid out ~rom the floor plans enables all work procedures to be performed without cncountering vertically elongated obstructions thuæ greatly ~acilitating the effective completion of various work procedures including the installation of rebars. The sleeve and baseplate being constructed of plastic material provides a structure that i~ much stronger than presently used item~ and enables the device to be easily cleaned and is less hazardous to use as well as being easy to assemble and disassemble.
The sleeve 14 and the bolt or rod 16 can be assembled in relation to each other and le~t in assembled condition by .
leaving the nut 58 on the screw threaded upper end 50 of the bolt or rod 46 thereby even further reducing the number o~ loose components encountered when installing the sleeve 14 in relation to the baseplate 12.
The foregoing is con~idered as illustrative only of the principle~ of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown 0 and described, and, accordingly, all suitable modifications and equivalents may be resorted to, ~alling within the scope of the invention.
Claims (11)
1. An apparatus for forming an opening through a hardenable material which hardens while in contact with at least one form member comprising a baseplate, means detachably mounting the baseplate on the form member, an opening forming member, and means detachably mounting said opening forming member on said baseplate, said opening forming member projecting from said baseplate and mold member and having a length to extend completely through the hardenable material to form an opening therein when removed after the material has hardened, said baseplate mounting means enabling removal from the mold member when the mold member is separated from the hardenable material after hardening thereby enabling reuse of the baseplate and opening forming member.
2. The structure as defined in claim 1 wherein said opening forming member includes a tubular sleeve having a peripheral wall and one end wall with the other end of the peripheral wall being open for engagement with the form member and baseplate, said means detachably mounting said opening forming member to said baseplate including an elongated retaining bolt having one end threadedly engaged with the baseplate and the other end extending through an opening in the end wall of the sleeve to retain the sleeve in place, said bolt including means exerting force on the sleeve to remove it from the hardenable material when the bolt is unscrewed from the baseplate.
3. The structure as defined in claim 2 wherein said sleeve is cylindrical and said baseplate is a circular plate, said sleeve and plate being constructed of plastic material with the baseplate including an internally threaded nut rigid therewith.
4. The structure as defined in claim 3 wherein said means detachably mounting the baseplate on the form member includes a plurality of screws extending through the baseplate into the form member.
5. The structure as defined in claim 4 wherein said hardenable material is a concrete floor and the form member is a wood deck supporting the concrete floor when it is poured for hardening, said baseplate being secured to the wood deck prior to positioning rebars and concrete, said sleeve being secured to the baseplate after positioning rebars and immediately prior to pouring concrete with the end wall of the sleeve being positioned above the top surface of the concrete when it is poured and hardened.
6. The method of forming an opening through a concrete body comprising the steps of positioning a form member to support and contain a formable concrete mixture, attaching a mounting plats on the form member, positioning reinforcing members in desired relation to the form member, mounting an opening forming member on said mounting plate with the outer end extending beyond the reinforcing members, placing the concrete mixture in covering relation to the form member, reinforcing members and opening forming member with the outer end of the opening forming member being left uncovered and exposed allowing the concrete mixture to harden into a concrete body, releasing the opening defining member from the mounting plate, extracting the opening defining member from the hardened concrete body from the surface thereof remote from the form member to form a cavity in the concrete body closed at an inner end by the form member, separating the form member from the concrete body thereby forming an unobstructed opening in the concrete body.
7. The method as defined in claim 6 wherein said step of positioning a form member includes the step of positioning a wood deck to form a concrete floor, said step of attaching a mounting plate on the wood deck includes the mounting of the mounting plate by the use of a plurality of screws.
8. The method as defined in claim 7 wherein said step of mounting an opening forming member includes the step of positioning a sleeve over the mounting plate and securing the sleeve in place by a screw threaded rod.
9. The method as defined in claim 8 wherein the step of extracting the sleeve includes the step of unscrewing the rod from the baseplate and imparting a force on the sleeve to remove it from the hardened concrete.
10. The method as defined in claim 9 including the step of detaching the mounting plate by removing the screws from the deck after the deck is separated from the concrete floor after it has hardened.
11. The method as defined in claim 9 including the step of detaching the mounting plate by removing the screws from the mounting plate before the deck is separated from the hardened floor and using the threaded rod to lift the mounting plate from the cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2033556 CA2033556A1 (en) | 1991-01-03 | 1991-01-03 | Apparatus for forming voids in concrete and method of use thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2033556 CA2033556A1 (en) | 1991-01-03 | 1991-01-03 | Apparatus for forming voids in concrete and method of use thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2033556A1 true CA2033556A1 (en) | 1992-07-04 |
Family
ID=4146754
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2033556 Abandoned CA2033556A1 (en) | 1991-01-03 | 1991-01-03 | Apparatus for forming voids in concrete and method of use thereof |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2033556A1 (en) |
-
1991
- 1991-01-03 CA CA 2033556 patent/CA2033556A1/en not_active Abandoned
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued | ||
| FZDE | Discontinued |
Effective date: 19980105 |