Static molds – In situ construction engineering type or building type-mold... – Forming building structure
Reexamination Certificate
2000-05-03
2002-05-21
Callo, Laura A. (Department: 3635)
Static molds
In situ construction engineering type or building type-mold...
Forming building structure
C249S023000, C249S024000, C249S211000, C052S354000, C052S360000, C052S745060
Reexamination Certificate
active
06390438
ABSTRACT:
BACKGROUND
This invention relates to the construction of concrete slabs, and in particular to a support structure that is rapidly and efficiently put in place, and rapidly and efficiently removed in condition for reuse.
Concrete slab construction is, of course, a routine method for horizontally covering open areas between columns and girders affixed to the walls of buildings, parking garages, and so on. A typical procedure for installing these concrete “floors” is to first place shoring members across the columns and girders, with shoring support posts rising from the ground or the deck below to the concrete floor being installed. Corrugated decking is then placed on the surface of the shoring, with the edges of the decking overlapping flange edges on the permanent building wall, girders and columns. Post-tensioning steel cables are then placed over the decking to add strength to the resultant structure. Conventional reinforcing bars can be used as well. Wet concrete is then poured over the corrugated decks. The concrete is then allowed to harden over a period of time. The supporting members can be so designed as to be removable after the concrete has hardened, simplifying concrete slab maintenance, and permitting re-use of the support structure on additional floors.
Various methods have been proposed for removable concrete slab support systems as is evident from the following examples. Keppler, in U.S. Pat. No. 1,707,226, discloses a supporting structure for concrete construction. This invention teaches a height adjustable shore
12
(centering post) cooperating with flanged
18
sheet metal members
16
(corrugated decking) connecting to height adjustable recesses
21
in soffit chairs. The invention notes (col. 2, lines 01-109), “after the concrete has been sufficiently set, the shoring may be removed and the ledgers taken down, whereby the centering forms with the soffit chairs may be removed and permanent shoring mounted in place to engage the soffit plates or boards for continuing to support the concrete until it is firmly set with full strength”. Lutz, in U.S. Pat. No. 3,059,738, discloses a removable concrete slab support wherein a portion of the support may be removed for the sake of economy prior to the concrete being fully set. An intermediate support
2
upheld by a prop
3
holds concrete slab supporting girders
1
and end supports
4
in place during the initial phase of setting wet concrete. Cornell, in U.S. Pat. No. 4,856,252, discloses a joist hanger
10
for removably securing a joist
38
during concrete slab construction. The joist hanger
10
has a box like metal configuration for securing the end of a suitable joist in the hanger. The joist hanger
10
has an extension section
18
for overlapping the top surface of a wall or girder
52
, with a roll bar
22
acting as a pivot located a spaced distance below the extension section. After a concrete slab
34
is solidified on as suitable support
36
, a sharp blow to the hanger causes it to pivot on roll bar
22
, thereby releasing the hanger
10
, joist, and support form the hardened concrete slab.
While these devices and methods disclose useful details for installation and removal of concrete slab support systems, they do not envision the efficiencies and conveniences inherent in the present invention. As will be more fully discussed below, this invention discloses a removable structure and method for supporting wet concrete during concrete slab construction without making use of vertical posts or shoring members which have to be supported down through the floors below to the ground. Accurate set up of corrugated decks is quickly accomplished to accept wet concrete. After the concrete has hardened all support members are quickly removed, ready for re-use as required.
It is therefore a primary object of the invention to provide a removable structure for supporting concrete slab construction that can be quickly put in place prior to the pouring of wet concrete, and quickly removed in re-usable condition after the concrete has hardened.
A further object of the invention is to eliminate the necessity for using vertical posts or shoring members which would have to be supported down through the floors below to the ground.
Another object of the invention is to permit the pouring and forming of a number of levels of concrete slabs in any desirable sequence.
Still another object of the invention is to provide for the plane of the shoring to always be automatically in the plane of the floor being formed.
A further object of the invention is to eliminate the necessity for permanently affixing structural support members to each other.
An additional object of the invention is to provide for most efficient placement of steel tendons within the concrete if post tensioning reinforcement concrete slab production is employed.
SUMMARY
In my application Ser. No. 09/041,944, filed Mar. 13, 1998, which is now U.S. Patent No. 5,906,076, the disclosure of which is hereby incorporated by reference, I describe a removable support for concrete slab construction and method which achieves the above mentioned objectives and others. The above mentioned U.S. Patent disclosed vertically and laterally adjustable latches affixed to ends of shoring girders and shoring beans for quick connection to pre-cut holes in permanent building girders and columns, and shoring girders and shoring beams. Bearing shoes on a first end of corrugated decks cooperate with locking straps at a second end of said decks to complete the structural elements of the invention.
I have now discovered that the removable support for concrete slab construction in my application Ser. No. 09/041,944, filed Mar. 13, 1998, now U.S. Pat. No. 5,906,076, can be improved by replacing the disclosed vertically and laterally adjustable latches affixed to appropriate ends of shoring girders and shoring beams with latches which can be extended horizontally forward away from or retracted towards the ends of said shoring girders and shoring beams as will be more fully described below.
In building construction, concrete floors are routinely installed horizontally between permanent building columns and girders supporting the walls of the building. Wet concrete is poured over usually temporary corrugated decking erected between the building girders and columns. Typically shoring posts are required, the posts extending vertically from the ground or previously formed floor, in order to support the temporary shoring. For a variety of reasons, including economy in building construction and ease of maintenance of the finished building, removal of the corrugated decking, temporary shoring, and vertical post supports is desirable.
I have found that concrete floors can be constructed faster and more efficiently by eliminating any necessity for temporary vertical shoring supports. This permits forming floors at any convenient level without concerns regarding foundation supports for temporary shoring. In addition, my method provides for precise, accurate placement of temporary supports in that when all elements are positioned they are all in their proper location with minimal field measuring or adjusting.
For example, my method makes use of a right angle grid of shoring girders and shoring beams positioned between the permanent steelwork comprising the building columns and girders. The shoring girders and shoring beams can be constructed from conventional steel “I” beams with their ends modified with a latch device which allows insertion into a support for quick erection, adjustment, and removal. The purpose of the shoring girders is to provide support for the shoring beams, with the shoring beams providing the support for the corrugated decks. Conventional corrugated decking is employed with the exception that the ends of the decking to be supported by the building “I” beams have a bearing shoe added to the closed end of the corrugated decking to facilitate removal from the hardened concrete with will be more fully described below. The bearing shoe also prevents vertical displacement of the deck
Callo Laura A.
Quast, Esq. W. Patrick
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