US3178856A

US3178856A - Form arrangement for casting transverse connecting members in a concrete girder ceiling

Info

Publication number: US3178856A
Application number: US134779A
Authority: US
Inventors: Grebner Fritz
Original assignee: Individual
Current assignee: Individual
Priority date: 1960-09-05
Filing date: 1961-08-29
Publication date: 1965-04-20
Anticipated expiration: 1982-04-20
Also published as: GB944883A

Description

F. GREBNER April 20, 1965 FORM ARRANGEMENT FOR CASTING TRANSVERSE CONNECTING MEMBERS IN A CONCRETE GIRDER CEILING 3 Sheets-Sheet 1 Filed Aug. 29, 1961 //v VEN TOR F071 Guilt-BN5?- April 0, 1965 F. GREBNER FORM ARRANGEMENT FOR CASTING TRANSVERSE CONNECTING MEMBERS IN A CONCRETE GIRDER CEILING 3 Sheets-Sheet 2 Filed Aug. 29, 1961 Fig.6.

Fig.5.

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FORM ARRANGEMENT FOR CASTING TRANSVERSE CONNECTING MEMBERS IN A CONCRETE GIRDER CEILING Filed Aug. 29, 1961 3 Sheets-Sheet 3 Fig.9.

, a i; V 4S Fig.10. Fig.11.

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United States Patent 3,178,856 FORM ARRANGEMENT FOR CASTING TRANS- VERSE CONNECTING MEMBERS IN A CON- CRETE GIRDER CEILING Fritz Grebner, 7t} Annabergstrasse, Mainz, Germany Filed Aug. 29, 1961, Ser. No. 134,779

Claims priority, application Germany, Sept. 5, 1969,

1 Claim. (Cl. 50293) This invention relates to a form arrangement for casting transverse connecting members in a concrete girder ceiling, and more particularly to such an arrangement for ceilings in which the concrete girders are at least partly pre-formed.

It is known to assemble ceiling girders at least partly preformed of reinforced concrete in spaced horizontal juxtaposed parallel relationship to form the load hearing elements of a floor or ceiling. It is usually necessary to connect the several girders by transverse stiffening and reinforcing members.

The present invention aims at providing an arrangement by means of which transverse connecting members may be conveniently formed.

Another object is the provision of form elements for I casting such transverse connecting members.

An additional object is to provide form elements which prior to use occupy but a minimum of space, and can be transported to a building site in stacks and similar space saving arrangements.

A further object is the provision of such form elements which may be transformed from their space saving inoperative condition to an operative condition without the use of tools, and with a minimum of effort.

Yet another object is the provision of form elements for transverse connecting members of the type described which are inexpensive and disposable.

Other objects and many of the attendant advantages of this invention will be readily appreciated as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings in which like reference numerals designate like parts throughout the figures thereof, and wherein:

FIG. 1 is a fragmentary perspective view of a form arrangement of the invention, partly in section;

FIG. 2 is a plan view of a form element of the invention in the inoperative condition;

FIG. 3 shows a modified form element of the invention in the inoperative condition in a View corresponding to that of FIG. 2;

FIG. 4 is a sectional elevational view of the form ele ment of FIG. 3 in the operative condition;

FIG. 5 illustrates the cooperation of the form element of FIGS. 3 and 4 with other members of a casting arrangement, the view corresponding to that of FIG. 4;

FIG. 6 shows a modification of the arrangement of FIG. 5;

FIG. 7 shows a detail of the arrangement of FIG. 6 in plan view;

FIG. 8 illustrates another modification of the device of FIG. 5 in an elevational sectional detail view;

FIG. 9 shows a form member of the invention for easting a terminal transverse connecting member, in a plan view of the inoperative condition;

FIG. 10 is a sectional elevational view of the form member of FIG. 9 in the operative condition; and

FIG. 11 shows the form member of FIG. 10 in association with other elements of a casting arrangement in a view corresponding to that of FIG. 5.

Referring now to the drawing in detail, and initially to FIG. 1, there is seen a portion of a ceiling in the proc- "ice ess of being constructed. The ceiling is to be carried by a plurality of spacedly juxtaposed girders 1 which are partly prefabricated to include a lower chord 2 of steel reinforced concrete, an upper chord 3 of reinforcing steel, and a plurality of diagonally arranged lattice members welded to the upper chord 3 and to the reinforcing bars (not visible) in the concrete lower chord 2 in which the lattice members are partially embedded.

Hollow filler blocks

5, 5a of light-weight aggregate are arranged in rows between adjacent juxtaposed girders 1. They are formed with shoulders 6 which are seated on the lower concrete chords of the girders 1. Where the girders 1 are to be connected by transverse connecting members, the rows of filler blocks are interrupted between two

adjacent blocks

5, 5a.

A form element 7 is interposed between the

blocks

5, 5a. It consists of thin sheet material which is capable of being folded. Prior to use, each form element is a flat sheet as shown in FIG. 2 which is provided with two parallel preformed creases 3, d which provide hinges between the center and side portions of the sheet. The sheet is readily folded about the preformed creases into a substantially U-shaped channel 1f? the length of which corresponds to the spacing of the girders 1, and the width of which is approximately equal to the spacing of the

blocks

5, 5a.

When set in place, as shown in FIG. 1, the form elements 7 rest on the lower concrete chords of the girders 1, but they may be supported in any other desired manner although the arrangement illustrated is preferred because of its simplicity. The channels 10 of the several form elements are axially aligned, and

steel reinforcing bars

11, 12 extend over a row of channels in which they are secured in a conventional manner.

When concrete is poured on the form arrangement illustrated in FIG. 1, the fluid mass fills the interstices between the several elements of the girders 1, and between the girders 1 and the filling blocks 5. It also fills the aligned channels 10 about the reinforcing

bars

11, 12. If the amount of concrete is sufiicient, there is formed a floor or ceiling in which the entire structure seen in FIG. 1 is embedded.

FIGS. 3 to 11 illustrate arrangements for casting transverse members connecting the girders in a ceiling in which the filler blocks 5 of FIG. 1 are replaced by form members in which filler elements are cast simultaneously with the transverse connecting members.

The form elements of the invention for use in the modified arrangement are preferably shaped as shown in FIG. 3. A fiat sheet panel 13 of foldable material, such as sheet metal, plastic, or preferably cardboard or coated cardboard, is provided with two parallel creases 14. The rectangular elongated area 15 between the creases forms the bottom wall of a channel 17 when the panel is folded perpendicularly about the creases as seen in FIG. 4. The remainder of the panel forms two side walls 16 each bounded by an arc of a circle and one of the straight creases 14 which constitutes a chord of the arc.

The ceiling structure in which the form element 13 is employed includes girders of the same type as shown in FIG. 1, and the form elements 13 are supported thereon in the same manner as described above with reference to the form elements 7. The girders are not illustrated in FIGS. 5 and 6 for the sake of simplicity.

The blocks 5 are replaced in the structures shown in FIGS. 5 and 6 by form elements 18 of corrugated sheet metal, each having the general shape of a segment of a hollow cylinder the axis of which is parallel to the direction of elongation of the girders, and which is cut off in an axial plane. The corrugations of the form elements extend circumferentially from one girder to an adjacently juxtaposed one. The axial edges of the cylindrical form elements are supported on the lower chords 2 of the girders 1. This arrangement which is conventional in itself, permits a ceiling to be cast, the underside of which shows parallel cylindrical vaults lined by corrugated sheet metal whichremains permanently in place.

Where such a ceiling is to be provided with transverse stilfening and reinforcing members, the inverted troughs V spacing of the girders 2 is approximately equal to the constituted by the corrugated metal segments are interrupted, and folded sheet metal channels are inserted into the spaces between adjacent corrugated metal elements as shown in FIGS. 5 and 6. The arcuate outer circumference of the side walls 16 substantially conforms to the. circumferential curvature of the corrugated elements. The side walls 16 form axially terminal walls of the in verted troughs formed by the cylinderical corrugated elements. The uppermost portion of each sidewall 16 projects but slightly above the highest adjacent portion of the corrugated form element 18. i

The side walls 16 are shown in FIG. 5 to be secured to the adjacent form elements 18 by means of clips 19 folded into an approximate S-shape. One bight of the S-shape which is downwardly open or inverted U-shaped is placed over the upperedge of a side wall 16. The other bight which is upwardly open as an upturned hook supports a circumferentially elongated and downward edge or lip of the form element 18. The two clips 19 attached to the two side walls 16 of the same foldable forrnelement 13 are connected by a bar 2% which is integral with both clips 19 and acts as a spacer. It holds the side walls 16, at a predetermined'distance and contributes to the rigidity and stability of the form arrange-v ment.

A modified arrangement .of clips 22 and a spacer bar 21 is shown in FIG. 6. The spacer bar 21 and the clips 22 form an integral elongated sheet metal structure the center portion 21 of which is folded in a conventional manner to make it rigid, and constitutes a spacer bar. The longitudinal lug-shaped ends 22 of the sheet metal structure pass outward ofthe channel 17 through corresponding openings in the side walls 16 and are folded downward to retain a top edge portion of a corrugated cylindrical form element 18. Details of the sheet metal structure constituting the spacer bar 21 and the clips 22 prior toinsertion in the openings of the side walls 16 are seen in FIG. 7.

Yet another clip arrangement not associated with a' spacer bar is illustrated in the detail view of FIG. 8. The clip 23 is S-shaped and similar to the clip 1% shown in FIG. 5. The end portion thereof supporting the form element 18 is arc-uately shaped to conform to a corrugation of the form element 18, and riveted thereto.

A modification of the form arrangement of the inventionfor casting transverse members connecting terminal portions of a plurality of parallel elongated girders is illustrated in FIG. 11 and the foldable form element of the invention employed in this arrangement is shown in FIG. 9 in a plan view. It is similar to one half of the panel shown in FIG. 3, and consists of a rectangular bottom portion to which a side wall portion 16' is integrally hinged by a crease 14. The side wall portion 16 has in part the shape of the segment of a circle which is joined by an approximately rectangular portion one side of which is formed by the'chord of the circular arc, but the length of which is shorter thanthat of the chord, and equal to thelength of the bottom portion 15'. angles about the crease 14', the form element of FIG. 9 assumes the. L shape seen in FIG. 10.

FIG. 11 shows a load bearing brick wall 24 on which longitudinal end portions of a plurality of girders 25 are supported. Only one girder is shown in 'FIG. 11. The girder is substantially identical with the girders 1 shown inFIG. l, and consists of alower chord 26 of reinforced When folded at right Cir concrete, an upper metal chord 27, and diagonal lattice members 28 which connect the chords. The transverse lengthof the bottom portion 15 of the foldable form element of FIGS; 9 .and 10, and the height of the concrete lower chord is approximately equal to the distance of the crease 14 of the form element from the chord of the arc which bounds the major portion of the side wall 16. The side wall 16' thus seals the space between the corrugated form member 18 and the brick Wall 24,

.and it extends slightly beyond the circumference of the member 18 so that the latter may be fastened by means of clips in the manner shown in FIGS. 5 to 8.

The form elements of foldable material according to the invention maybe transported to a construction site in stacks occupying but a minimum of space. They may be folded into the operative shape by unskilled personnel without the use of tools, and are: simply dropped in place. Transverse connecting members may then be cast therein at once.

It should be understood, of course, that the foregoing disclosure relates to only preferred embodiments of the invention and that it is intended to cover all changes and modifications of the example of the invention herein chosen for the purpose of the disclosure'which do not constitute departures from the spirit and scope of the invention set forth in the appended claim.

What is claimed is:

In a form arrangement for casting concrete ribbed ceilings, the combination of a plurality of spaced parallel horizontal girders, a plurality of form elements each constituted by a unitary piece of sheet material having a center portion, two side portions, said side portions havinga free marginal edge and another edge, and integral hinge means connecting said another edges of said side portions to said center portion for movement of the side portions relative to the center portion between an inoperative position in which said portions are coplanar and an operative position in which said portions define a substantially U-shaped cavity open at the top and ends thereof, said integral hinge means being constituted by creases in said sheet material between said portions, a group of said plurality'of form elements in operative position beingarranged in mutual alignment to define a discontinuous channel extending transversely of. said girders, said channel having an open top, two side walls and a bottom wall constituted by the respective side portions and center portion of said for-m elements, the center portion of each form element extending transversely between the resting OD'tWO of said girders, respective groups of said aligned form elements being spaced in the longitudinal direction of said girders to define rectangular spaces between the girders and the respective groups of aligned form elements, a plurality of .filler members occupying the respective spaces, each of said filler members being formed from sheet material and having an arched form with end edges defining open ends and a pair of lower side edges defining an open. bottom, said lower side edges resting on two of said girders to bridge the space therebetween, the side portions of each of said form elements being closely adjacent to said end edges-and closing the open ends of two of said filler members between which a form element is disposed with said free marginal edges of said side portions conforming to the arched form of the filler members and projecting upwardly beyond the same, said open end edges of said filler members extending downwardly and forming downturned lips, and connector means comprisinga bar spanning the open top said upturned hooks and connecting the filler members to the side portions of the form element.

References Cited by the Examiner UNITED STATES PATENTS Golding 50-285 Selfridge 25131.5 Lindau 50293 X Macomber 25131.5

Bevier 50-355 Brostrom 50280 Morgan 25131.5

10 HENRY c. SUTHERLAND, Primary Examiner.

WILLEAM J. STEPHENSON, JACOB L. NACKENOFF,

Examiners.