US2508635A

US2508635A - Apparatus for forming concrete slabs

Info

Publication number: US2508635A
Application number: US721209A
Authority: US
Inventors: Roy A Badt
Original assignee: Individual
Current assignee: Individual
Priority date: 1947-01-10
Filing date: 1947-01-10
Publication date: 1950-05-23
Anticipated expiration: 1967-05-23

Description

May 23, 1950 R. A. BADT APPARATUS FOR FORMING CONCRETE SLABS 3 Sheets-Sheet 1 Filed Jan. 10, 1947 INVENTOR.

Q I Z9 44 1! L 17.22%. 5. g ,7 *r I k 12 INVENTOR- y 1950 R. A. BADT 2,508,635

APPARATUS FOR FORMING CONCRETE SLABS Filed Jan. 10, 1947 3' Sheets-Sheet 2 39 3K 3m 5 [Z IIII: Ill WIIIIIIIIII Pay/4. 5407;

May 23, 1950 R. A. BADT APPARATUS FOR FORMING CONCRETE SLABS 5 Sheets-Shet 3 Filed Jan. 10, 1947 INVENTOR. for/4. 5 407; fl4% 47'7'0P/VEX moval.

Patented May 23, 1950 APPARATUS FOR FORMING CONCRETE SLABS Roy A. Badt, Beverly Hills, Calif.

Application January 10, 1947, Serial No. 721,209

7 Claims.

The present invention relates to concrete constructions in general and particularly to concrete slab constructions. More specifically the invention comprises and relates to the construction of concrete slabs by the use of removable metal forms in conjunction with open-web beams.

In the construction of concrete floors the floor proper is commonly supported by girders which may be of either structural steel or reinforced concrete. The girders are usually connected by a multiplicity of beams, also either steel or concrete, and these together with the overlying concrete slab form an integral floor which, of course, may also be a roof.

Heretofore in the forming of the concrete slab it has been common practice to employ steel forms or molds which extend between the beams and which may be variously shaped, as for example inverted channels. These steel forms after being positioned are usually supported by underpinning or the like and are adapted to support the concrete slab which is then poured thereon to encase the beams and the girders, or at least the upper parts thereof, to produce an integral floor or roof construction.

The concrete slab-supporting forms as used and as supported according to current practice are usually cumbersome to position and difiicult to remove. Additionally, the resulting construction involves the inherent disadvantage that if a ceiling is to be positioned therebelow, it must be spaced an appreciable distance below the beams in order to provide the necessary space for the usual electrical conduits and other installations. This is usually accomplished by hanging long galvanized wires from the concrete slab to the lower ends of which metal channels are attached to support the ceiling construction which may be plastered.

According to the present invention a concrete floor or roof slab is constructed by the use of removable metal forms secured between open web I-beams in a manner permitting of ready re- The I-beams are braced to prevent side buckling or lateral deflection by suitable bridging beams removably secured in place and cooperating with the open web permanent I-beams to support the forms during the pouring of the concrete. These bridging beams may be left in place permanently if desired. According to the present invention it is unnecessary to space the ceiling below its overlying supporting structure to provide for the electrical conduits and other v installations for they may extend through the open web of the I-beams. Each of the forms used in the molding of the concrete is removable for reuse and with a minimum of effort. The resulting concrete construction conforms to accepted practice.

It is, accordingly, an object of the present invention to provide an improved construction or organization for use in the making of concrete floor or roof slabs.

It is another object of the invention to provide a new and improved cooperative organization including removable forms for the making of concrete floor or roof slabs supported by open web beams.

A still further object of the invention is to provide an improved organization of parts including forms and supporting beams for the construction of reinforced concrete slabs.

These and other more specific objects will appear upon reading the following specification and claims and upon considering in connection therewith the attached drawings to which they relate.

Referring now to the drawings in which preferred embodiments of the present invention are disclosed:

Figure 1 is a view in perspective of an illustrative section of the construction comprising the present invention prior to the positioning of the reinforcing steel mesh and the pouring of the concrete slab;

Figure 2 is a partial View of the construction of Figure 1 after the concrete slab has been poured;

Figure 3 is a vertical section upon the line 3-3 of Figure 2 and shows the mounting of the bridging members in the open web of the I-beam and the support of the reinforcing mesh by the chair nails driven through the forms into the wooden stringers;

Figure 4 is a vertical section upon the line 4-4 of Figure 3 and illustrates the method of supporting the removable form from the I-beam by means of flange clips and also the seating for the bridging members;

Figure 5 is a section upon the line 5-5 of Figure 3 and illustrates the retention of the forms upon opposite sides of the I-beam by means of a web clip;

Figure 6 is a view in perspective of a flange clip;

Figure 7 is a view in perspective of a web clip;

Figure 8 is a view in perspective of a chair nail;

Figure 9 is a perspective view of a section of a construction comprising a second preferred embodiment of the invention making use of a different arrangement of parts and omitting the reinforcing mesh in the concrete slab; and

Figure 10 is a perspective showing of the' rethe exact dimensions and proportions are not of the essence of'the'invention for they are variable :within' the limits permitted by good design. After the pouring of the concrete into a slab, indicated in the drawings by the reference character 46, the entire construction is given the necessary time period for hardening into a selfsupportingand unitary mass. Before discussing the removal of the forms, attention will be given to the flange and web clips which have previously been referred to generally.

The flange clip 3I, shown in detail in Figure 6, comprises a strap-like element of metal shaped to provide a flat top wall portion 41 of a length sufficient to overlie the I-beam flange I2. One end 48 is turned downwardly and inwardly to extend under the flange I2 in looking relationship. :The opposite end, 49, extends at right angles to the top wall 41 and a triangular flap or'tongue BI is carried thereby, extending at right angles. Flap 5| may be stamped from the end 49 and its presence leaves a lower flap 52. which, at the time the flange clip is positioned upon the I'- beam, lies in the plane of the end wall 49. The latter is so dimensioned as to extend snugly into and through a slot 32 formed in the top wall 2? of form 26, as illustrated clearly in Figure 1. When so positioned, the flap or tongue 5| overlies the top surface of the form and the tongue 52 is positioned therebelow. Tongue 52 when so positioned isbent at right angles to itself into the position illustrated in dotted lines in Figure -.6 at which time it locks the form against downward displacement. Preferably the distance separating the two tongues is substantially the width of the form top wall 21. As is clearly illustrated in Figure 1, the flange clips 3| are arranged along the I-beams with the tonguecarrying sides 49 extended upon both sides there.-

inner extremity of which is spaced from the inner surface of end 51 by a distance equal to the distance which should separate the spaced faces of form end walls 28 upon opposite sides of an I beam I I. The clips 43 are adapted to extend through the spaced slots 44 arranged along the form end walls 28 in the manner illustrated in Figure 5. When so positioned, the end 5'! lies adjacent one form end wall 28, the top wall 56 extends through apposed slots 44 and also through the opening I4 of the web I3 positioned therebetween. The tongue 59 is bent at right angles .to' itself from the full line position shown in Figure 7 to the dotted line position in which it .will also extend at right angles to the slot 44 and s0 function to hold the end walls 28 against the web I3 and also lock the clip against'displacement. This relationship is clearly illustrated in Figure 5.

After the entire unit has set for the necessary time period for the concrete to harden as to be self-supporting, the forms and the supporting structure can be removed. The first step in this operation comprises the removal of the shims 36 which may be driven from below the stringers by a hammer or other driving tool. With the shims displaced the bridging beams I6 can then be removed if desired. With the form of angle seat illustrated in Figures 1 and 2, this displacement requires only the forcing of the seat upwardly sufliciently to displace the web from the angle seats orslots I9 whereupon the attached bridging member I6 can be removed. The opera;- tion is repeated ifor each bridging beam. If the bridging seat elements illustrated in Figure 10 are employed, the worker need only loosenthe bolts 23 to permit of removal. In either event the removal operation is a fairly obvious one.

After the removal of. .the various bridging beams, the stringers 34 can be displaced. They are held only by the downwardly .extending pointed ends of the chair nails 3'! and can be pried free witha minimum of effort. Thereafter it is necessary only to break 0133, as by hammer blows, the

tongues

52 and 59 of the flange clip 3i and the web clip 43, respectively, and the forms 26 are free for downward displacement aside, possibly, from a slight adherence to the concrete. The presence ofthe form slots 38, through which the chair. nails 31 extend, permits of lateral displacement of the forms from the beams should displacing movement in that direction be .desired. Their. removal completes the dismemberment of the removable structural elements. Of course, if desired, all ofthe afore- :descrlbed parts can-be left in place but for purposes of economy their reuse will usually be contemplated. The removal of the various forms and their upporting means leaves a unitary construction in which the concrete slab 46 is supported by the spaced beams :I l and, of. course, at the ends of the beams by the girders which are unshown but which are ofthe usual type. .As previously suggested, if a ceiling is to be placed below the slab it may be connected directly to the lower flanges l2 of the I-beam and without spacing for conduits and other installations can be run transversely through the beams and specifically throughthe openings I4 formed in the webs I3 thereof.

Referring now specifically to the second preferred embodiment of the invention illustrated in Figure 9, a modified construction is shown employing certain of the basic concepts of the first described embodiment. The. spaced I-beams are again indicated generally. by the, reference character H and include .upper and lower flanges I2 spaced by a Web I3 formed with longitudinally spaced openings. I4. The bridging beams I6 of tween each of the I-beams. I I.

The removable metallic forms of the present invention are quite different from forms 26 of the first embodiment. and are indicated generally by the reference character 66. Each form is shaped as aninverted channelmember and includes a .top surface 61 connected to perpendicular end :walls 68 by ,a bevelled corner 69. Each end wall is formed at its lower. extremity with an inturned slotted supporting, footor flange 'II along the length of which are 1 arranged slots 12. -In the :first embodiment the, form .=26,.it will be remembered, wa formed with an end wall 28 upon only one end but in the present embodiment each side of the form 66 includes an end wall 68 and the forms are so arranged that the end walls 68 extend between the adjacent I-beams ll rather than lying adjacent to one. or them. This are rangement. brings; the transversely extending: end wall. 6810f the 'iormintp alignment. with the: end walls of an adjacent form iii in the. manner clearly illustrated in Figure 9; the flanges. 11 restin upon the stringers. 34. The; form are again lapped and tomakethis possibleeneend is made slightly larger than the-other. tdpermit 0i telescoping. or, the natural resilience of the form maybe relied upon to enableit to bespreadsufe ficiently that its cooperating counterpart. may. he slid therein.

Transversely extending slots- 13 are formed a1 the ends of each form top wall fil and through these slots extend the flange clips 31!, previously described, which perform the identical function ascribed to. them in thefirst. embodiment. In this.v form of the invention reliance is placed solely upon these clips and upon thestringers 34. for the proper positioning of the forms.

Inthis the second embodiment of the invention the concrete reinforcing means comprising the mesh .41 of the first. embodirnentis omitted and the slab, here indicated at; againrests directly upon the supporting: formsand encases the top flange-120i the I-beams.

The methodof removalof-thesupportingform structure in this. embodimentls similar to that of the first embodiment with necessary variations to accommodate the differences inconstruction. The shims .36. are again first removed; whereupon the. bridging member I6 and the stringersil, can be displaced. Thereupon, and aiter'the removal of the. supporting tongues 52 of the flanges 3.1., or at least their. deformation back into a. plane permitting their passage through the slots 13, the forms 56 can be displaced.

While the particular construction herein shown and described in detail is fully capable of attaining the objects and providing the advantages herein before stated, it is to-be understood'that it is'merely illustrative of the presently preferred embodiments of the invention and that no-limitations are intended tothe details of construction .orzdesign herein shownother thanas defined in the appended laims.

I. claim:

'1. Apparatus for forming a. concrete slab :upon a supporting open web I-beam-.=comprisinga removable form extended'iromsaid Lbeam, a flange clipv overhanging said. beam and supporting said form therefrom, andra web clip extended through the. open. webi of said beamand: connecting said :form thereto.

2. Apparatus for forming a, concreteslab upon a. supporting open web beam having an upper flange comprising azremovable form including a top surface and an end wall, a flangeclipoven lying said flange of said beam andeonnected to the top surface of said form :to support same. .and a web clip extended through the open web of said beam and connected to said end wall to secure same to said web.

3. Apparatus for forminga concrete slab upon a'supporting open web. beam having an upper flange comprising aremovable-form including a top surface and an end walLsaid top surface and said end wall being formed. with openings, a

flange clip overlying the flange of saidbeam and to support.- said form, and a web clip extended through the open web ofzsaidzbeamand through an opening in said: end wall to. secure said wall to said web.

4-. Apparatus for forminga. concrete. slab.v upon a supporting open web. beam having an upper flange comprismgremovable forms; upon opposite sides of said beameach including-a top surface and an end wall, flange clips. overlying said flange of said beam and. connected to the top surfaces of said form, and a web; clip. extended through a web, opening of said beam and connecting the end walls of said forms; uponthe oppositeside thereof:

Apparatus. for; forming aeoncrete slab upon a,- supporting open web; beam having an upper flange comprising removable forms upon opposite sides. of said beameach including a top surface formed with spaced'slots and an end wall formed with spaced slots, flange clips. overlying said flange andextendedthrongh the slots in said. top surfaces. to. support. said forms, and web clips extendedthrough the slots in said; end walls. and

vtherebctween through an opening in the beam web to. secure said end walls to. said .web.

6.. Apparatus for forming a-ooncrete slab. upon a supporting open web. beamv having an upper flange comprising a removable form, including atop surface and an end wall, a flange clip overlying said flange of said beam and connected to r the topsu-rfaee of said; form to support same,

a webcl-ip extendedthrough the open web of said beam and connected to said end. wall to secure same to. said. web, and means; to. support said format. a. point spaced from said beam. including a bridging beamsecured to. said open web and extended rigidly below said form..

'7. Apparatusfor forming aconcrete slab upon a supporting open web. beam. having an upper flange comprising a' removabletorm including a topsurface and an end wall; a'fiange clip-overlying said flange of said: beam and connected to the top surface of said form: tosupport: same, a web clip extended throughthe open web-of said beam and connected to said endwall to secure same to said web, means to support saidform at a point spaeedfrom said beamincluding abridglng beam secured to said open web and extended rigidly below said form, and a stringerextended parallel to said beam and spacing said form from said-bridging beam. ROY A. BADT.

CITED Th fol w n references are of record in the :file of this patent:

UNITED STATES PATENTS Name Date Kunneke July 16, 1901 Moody Aug. 3, 1909 Sylvester. Aug. 25, 1914 Birch. .'Mar. 30, 1926 Davidson Sept. 20, 1927 Blocher Aug. .27, 1946 FQREIGN PATENTS Country Date Great Britain Mar. 21, 1929 Number 678,365 9311308 Number extended through an openingrinsaidtopsurfacc 1o.