US3163267A - Temporary supports for concrete floors - Google Patents

Description

Dec. 29, 1964 L. ALzlARl TEMPORARY SUPPORTS FOR CONCRETE FLOORS 2 Sheets-Sheet 1 Original Filed Feb. ll, 1960 www@ Dec. 29, 1964 L. ALzlARl 3,163,267

TEMPORARY SUPPORTS FoP CONCRETE PLooRs Original Filed Feb. ll, l960 2 Sheets-Sheet 2 /wf/wo United States Patent 'Y Oilce Patented Dec. 29, 1964 This application is a division of my copending application Ser. No. 8,077 led February 11, V1960, now abandoned.

When, in the construction of reinforced concrete tloors,

the molds used 'are made entirely of wood, the correct positioning of amold and of its stays requires numerous adjustments and forms a lengthy and difficult operation, since it is necessary to provide for alignment ofthe diierent sections of the operative surface of the mold which should remain in the same horizontal plane. In order to eliminate such diculties, it is common practice to resort to metal girders or beams formed by a single body or by a main body with one or two extensions sliding telescopically inside the vmain body and of which the upper at tlanges, engaging the edge boards rigid withthe ,walls or the like bearing members for the bays, carry the mold or the previously prepared hollow bricks or like elements, whereby it is possible to obtain the desired level of the oor through the very rigidity of the beams.

But this known system has a serious drawback which is the fact that the girders are too heavy and expensive even though they carry without substantially bending the weight of the floor although theyV rest only through their ends. immediately be lifted, provided the oor which is not' yet bestowed with the desiredresistance is held on auxiliary intermediate supports, it is impossible to remove ythe girders which carry the oor before a complete hardening of the concrete and total` solidication of the oor into a" rigid unit, which requires a long period of time.

The long time during which the girders are to be held in position for each oor during execution of the latter thus leads the contractor who is working on different sites to have a large number of such girders, which corresponds to ta large investment of capital and, consequently, the use of such girders, in spite of their advantages, is often considered by the contractor` as too expensive and therefore of no practical interest.

My invention has for its object a novel structure of such girders with a View to cutting out such drawbacks by allowing the removal of the girders as soon as the concrete has set, so as to be immediately vavailable for further use.

According to my invention, there-is provided longi- V tudinally of each girder, whether simple or compound, at

least one gap in the upper flange forming the supporting plane for the hollow flooring elements, said gap being obtained through a drop in the level of said supporting plane over a predetermined area so as to form underneath the general level of said supporting plane at least one free space through which it is possible to insert a transverse plank. Said plank, which should be suitably supported by stays to either side of the girder, is adapted to carry the section of the mold or of the hollow elements lying above it. As soon as the concrete has set, it is possiblev to remove the girder, the floor being carried then at one or more points of its length by said plank or planks which are removed only after complete solidication of the flooring'concrete incorporating the hollow elements.

say a main section with an extension, the area of the Now, whereas concrete vsets in a few days and may carrying surface which is to lievat a lower level may be provided in any of such sections, Yfor instance in the main ,sect1on, or else,i.n its extension.-

In the case of large spans, it may be necessary to resort to two main sections interconnected by an intermedif ate extension, and in this case, the extension should haveY a reduced height, so that the space extending between the two main sections may form above the upper ange of vthe intermediate connecting extension the desired empty space which is to be engaged. by the transverse plank.

I have illustrated, in the accompanying drawing and by way of a mere exemplication, two preferred embodiments of my invention. In said drawing:

FIGS. l to 3 illustrate a girder including a main section provided with an extension of a reduced height sliding telescopically inside'the mainsection at one` end of the latter." l

FIG. 1 is a side view of said girder, FIG. 2 is a cross-section through line II-II of FIG.

1, and

- FIG. 3 is a cross-section through line III-'III of FIG.v

l showing the girder together with the oor constitutedV bylhollow bricks laid over said girder and by the concrete cast over same. v

FIG. 4 is a lateral elevational View of an arrangement wherein the girder includes-.two sections interconnected by an extension or intermediate connecting section of aA reduced type.

Turning to FIGS. 1 to 3, the beam P isV constituted at Aleast near one of its ends in a manner such that it forms a guiding slideway for an extension R of a reducedheight,

either of said sections P and R or both being provided with bolts vor the .like clamping means for rigidly securing said V central trellis-work 4. The upper ange S of the girder Y It" the girder is constituted by a plurality of sections, .70

is constituted, in the case illustrated, by a tubular or box-shaped member, the upper surface of which is ilat and is Vadapted to carry the mold or the hollow elements and is provided at diierent points of its length with bolts 6 which may be screwed into the actual flange or, better still, inside nuts 6 welded to the edges of perforations extending through the lower wall of the box-shaped flange, so as to allow the free passage of the bolt Shanks. The heads 6 of said bolts allow operating the latter and the part played by the latter consists, upon unscrewing of the bolts, in engaging clampingly the upper ange 3 of the extension R, so that the latter may be alined with the main section of the girder, atter which the main section of the girder and its extension are locked together. According to the invention, the upper ange of the main section is interrupted towards themiddle .of its length or at several suitably spaced points, if the ilange is suffciently long, so as to leave an empty space above a portion p of a reduced height of said section, whereby it is possible to introduce across lthe gap thus formed a transverse plank M resting on the upper surface of said por- Y tion p which is at a lower Vlevel than the remainder of the upper surface of the main section. The upper surface of the transverse plank is flush with the general upper surface of the ange 5, as clearly apparent from inspection of- FIG. 1. Said plank is subsequently stayed-laterally of the girder, as shownat E before said girder is removed, while the plank should remain stayed in position until the floor has reached Vits final solidilication stage. The difference in level between the plane carrying the mold or hollow members and the yupper surface of the extension.

R which is held by `a bent T-shaped member on the corresponding lateral board may be compensated also by the insertion of planks. Y

VFIG. 3 shows the general arrangement of the'hollow bricks B or the like elementscarried by a series of girdersY P associated with a stayed transverse plank M, the hollow elements being capped byfa layer of concrete C.

-In the embodiment of my invention illustrated in FIG. A Y

4, which is more Vparticularlyof interestin the case .of large spans, the girder includes la plurality of sections, to

-witz `two main interconnected sections, the total lengthof which is adjustable by means of an intermediate connecting extension. The two main sections-P1 and'IZ show,

ythroughout their'length or at least near one end, the parn ticular structure `allowing them to actas la longitudinal -sertion of a transverse carrying plank M.

2. A temporary support for composite concretel floor' ing, comprising a plurality of spaced parallel beam as-` semblies, each beam assembly comprising a pair of metalg lic beams, one said beam of each 'assembly being hollow and the other. said beam o'each assembly sliding within said one beam, each said one beam having a top member terminating downwardly in an under surfaceyeach said other beam having a top surface spaced a substantial diS- tance below said under surface of the associated said one beam, and aplank extending transversely Vof and bridging across said beam assemblies and A top surfaces.

3. A suppont as claimed in claim 2, the top of the plank Y being substantially ush withV the tops of Asaid'top members.

4. A temporary support for Ycomposite concrete floor-` ing, comprising a plurality of spaced parallel beam as-Y semblies, each beam assembly comprising three metallic beams, two said beams of each assembly ybeing hollow and in longitudinalalignment with each other and having their adjacent ends spaced apart a substantial distance and aV thirdsaid beam of each lassembly sliding within said two In the case where the ygap betweenk the two main sec tions P1 and P2 is larger than thebreadth of a'plank, I

as 'shown at m 'and m', which are removed as soon asthe girderhas been removed.

Having` described my invention, I claim: 1

1. A metallic beam assemblyifopr temporarily carrying elementsof a composite concrete ioor, comprising a pairV of metallic beams, one said beam being hollow and the other'said beamy sliding within'said vone beam, said one beam having a top member terminating downwardly in an under surface, said other beam having a top surface spaced 'a substantial distance belowsaid under surace thereby to support a first plank on said top surface with the-vv plank extending transversely of the beamassernbly, said beam assembly having means defining an upwardly opening recess spaced a substantial distance from saidY other level as said top Surface thereby to support a second plank on said bottom `in parallelism to said irst plank.

' may lay, next to the first plank, one ortwo funtherplanks,

beamsof the associated assembly, said two beams of each V said lbeam assembly having top `membersr terminating downwardly 'in an under surface, each of said third beams having Vatop surface spacedV a substantial distance below the -under surface of the lassociated said top members,

- and a plank extending transversely of and bridging across said beam'vassemblies and resting onsaid top surfaces.

5. A support as claimed in claim 4, the top of the plank being substantially ush with the tops of said top members'. i A

References Cited by the ExaminerV LUNTTED STATES PATENTS 1,017,927 2/12y Tesseyman -189-37 YFOREIGN. PATENTS l 1,175,837 lll/58 France.

beam, the bottom of said recess being'at about thesame f 1,410 MICHAEL v. BRINDISI, Primary Exavm'ner.

6/11 Great Britain.

ROBERTF. WHITE, Exmner.-

resting on saidV

Claims (1)

1. A METALLIC BEAM ASSEMBLY FOR TEMPORAILY CARRYING ELEMENTS OF A COMPOSITE CONCRETE FLOOR, COMPRISING A PAIR OF METALLIC BEAMS, ONE SAID BEAM BEING HOLLOW AND THE OTHER SAID BEAM SLIDING WITHIN SAID ONE BEAM, SAID ONE BEAM HAVING A TOP MEMBER TERMINATING DOWNWARDLY IN AN UNDER SURFACE, SAID OTHER BEAM HAVING A TOP SURFACE SPACED A SUBSTANTIAL DISTANCE BELOW SAID UNDER SURFACE THEREBY TO SUPPORT A FIRST PLANK ON SAID TOP SURFACE WITH THE PLANK EXTENDING TRANSVERSELY OF THE BEAM ASSEMBLY, SAID BEAM ASSEMBLY HAVING MEANS DEFINING AN UPWARDLY OPENING RECESS SPACED A SUBSTANTIAL DISTANCE FROM SAID OTHER BEAM, THE BOTTOM OF SAID RECESS BEING AT ABOUT THE SAME LEVEL AS SAID TOP SURFACE THEREBY TO SUPPORT A SECOND PLANK ON SAID BOTTOM IN PARALLELISM TO SAID FIRST PLANK.

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