US3473778A

US3473778A - Formawork for starter walls

Info

Publication number: US3473778A
Application number: US600445A
Authority: US
Inventors: Guy Blonde
Original assignee: OUTINORD SAINT AMAND LES EAUX SA
Current assignee: OUTINORD SAINT AMAND LES EAUX SA
Priority date: 1966-07-12
Filing date: 1966-12-09
Publication date: 1969-10-21
Anticipated expiration: 1986-10-21
Also published as: DE1684381B1; NL147505B; GB1138700A; FR1493116A; NO117204B; NL6616313A; SE309105B

Description

Get. 21, 1969 BLONDE FORMWORK FOR STARTER WALLS Filed Dec. 9, 1966 Ann 7 rm. c1. ritm 11/08 11.5. Cl. 249-19 6 Claims ABSTRACT OF THE DISCLOSURE A starter formwork for casting a starter wall in one operation together with a structure produced by casting concrete into the space between shutterings of a main formwork, comprising at least one end rember adapted to engage a shuttering of the main formwork for support thereon, and at least one side member releasably supported by the end member. The end member includes a surface which defines an end face of the starter wall to be produced and inclined for ready release from the hardened concrete. The side member has a surface defining a lateral surface of the starter wall, and the end member and the side member extend to a level corresponding to the height of the starter wall.

The present invention relates to an improvement in formwork for starter walls, that is to say, formwork adapted to establish a small starter wall which has a height of a few centimeters and to which a main formwork is to be secured for casting the final wall.

Such a method of construction has already been described elsewhere, and a formwork has become known thereby which can be dismantled and which is constituted of shells or shutterings which permit walls and an upper fioor to be cast in one operation. In this method, a starting forrnwork must be placed in position before the main formwork is erected, and a wall base or starter wall is produced therewith which has a thickness of a few centimeters and the same length as the final wall. The main formwork is attached to the starter wall after the concrete has hardened, and is correctly held in position thereby.

These starter walls are produced by means of special shutter members, for example angle members which are interconnected by means of coupling bars which permit them to be located accurately. The starter formwork cannot be placed in position until the walls and fioor on which it is to be used have set and hardened. Thereafter the starter wall must be cast and a new waiting period must elapse before the setting and hardening thereof are assured. Consequently valuable time is lost during the construction for the simple operation of producing these small starter walls.

The present invention is directed to avoiding this disadvantage by casting the starter walls in one operation together with the casting of the wall and floor.

It is one object of the present invention to provide a starter formwork for casting a starter wall in one operation together with a structure produced by casting concrete into the space between shutterings of a main formwork, the starter formwork comprising at least one end member adapted to engage a shuttering of the main formwork for support thereon, and at least one side member releasably supported by the end member, the at least one end member having a surface which defines an end face of the starter Wall to be produced and which is inclined for easy release from the hardened concrete and the at least one side member having a surface defining a lateral surface of the starter wall, the at least one end member and nited States Patent the at least one side member extending to a level corresponding to the height of the starter wall.

It is another object of the present invention to provide a starter formwork comprising an end member having the general shape of a wedge provided with shoulders for resting on the upper edge of a shuttering of the main formwork and for receiving the side members, the latter being maintained in contact with the end member by a rod extending through the side members and the end member.

It is still another object of the present invention to provide a starter formwork wherein the lower portion of the end member has a recess which is large enough to permit reinforcement bars of the wall and the floor to pass therethrough and thu to permit the end member to be placed in position and extracted again.

With these and other objects in View, which will be come apparent in the following detailed description. the present invention will be clearly understood in connection with the accompanying drawing in which:

FIGURE 1 is a vertical cross-section through a starter formwork for a wall from the two sides of which floors extend;

FIG. 2 is a vertical cross-section through the starter formwork for an end wall with one floor extending therefrom; and

FIG. 3 is a sectional view of the end member with two angle members resting thereon.

The starter formwork is constituted by an end member 1 and two side members, such as angle members 2 and 3 as shown in FIG. 1. Alternatively, the starter formwork may be constituted by an end member 11 and one angle member 12 as shown in FIG. 2. The end member 1 is used for a party wall, that is to say, a wall from which floors extend on both sides. The end member 11 is used for an end wall, such as a gable wall; that is a wall from which only one floor extends on one side thereof.

The end member 1 generally has the shape of a downwardly directed wedge and is provided on both sides with

projections

4 and 5 which do not extend over the whole height of the packing member. The

projections

4 and 5 have. shoulders with horizontal upper surfaces 6 and lower surfaces 7. The member 1 is intended to be supported by the engagement of the surfaces 7 with the upper portions or edges of shutterings 8 of a main formwork, whereas the lower lateral faces of the end member rest against the upper portion of the vertical surfaces of the shutterings 8. The vertical flanges of the angle members 2 and 3 rest against the upper lateral surfaces of the end member 1 and the horizontal surfaces of the angle members 2 and 3 engage the upper surfaces 6. The height of the

projections

4 and 5 corresponds exactly to the thickness of the floor to be cast. The dimensions of the upper surfaces 6 and the upper lateral surfaces of the end members 1 are selected so that the angle members 2 and 3 can be located thereon as accurately as possible. The angle members are held on the end members 1 by tie rods or bolts 9 which extend through holes in the angle members and through holes 10' provided in the upper portion of the end members 1.

The end member 1 generally has the shape of a wedge, that is, it is tapered in order to facilitate its extraction. In particular the surface in contact with the concerte and defining the end face of the starter wall is inclined for easy release from the hardened concrete. The

projections

4 and 5 also have a downwardly directed taper.

T be lower portion of the end members 1 or 11 is provided with a recess 13 which permits the passage therethrough of reinforcing bars of the wall and of the floor and permits the end member to be placed in position and extracted again without undue difliculty.

The end members 1 or 11 may be manufactured in a single solid piece, but it is preferable to produce it by welding from plate material so that it is hollow and light. In this latter case it will be necessary to close the internal faces of the recess 13 so as to avoid an ingress of cast concrete into the interior of the packing member; preferably the same applies to the external portion of the packing member and in particular to the surfaces 6 and 7.

The end member 1 is intended for a party wall, that is a wall form which a floor extends on each side. In the case of an end wall (FIG. 2), the end member 11 has the same structure as the end member 1 except that it has only one projection 5. The end member 11 is supported on a single shuttering 8 and it supports a single angle member 12. An outer member 14 of another shuttering is in engagement with the entire other side of the end member and extends to the same level as the upper portion of the latter and of the angle member 12.

In order to use this formwork when the shutterings of the main formwork are already in position, the end members 1 or 11 are distributed as required, the angle members 2 and 3 or 12 are placed in position and are aflixed to the end members by means of the tie rods 9. Thereafter the concrete is cast in the normal manner'as practiced heretofore, in order to produce a wall between two shutterings and a floor above the respective shuttering. When the floor has been cast to the required thickness, at little additional concrete is cast between the angle members 2 and 3 or between the angle member 12 and the shuttering member 14, so that the concrete is level with the upper portion of the angle members or the shuttering member.

The starter wall is thus constituted. In view of its small height which is a few centimeters and frequently less than centimeters, its hydrostatic pressure is low and the high viscosity of the concrete prevents the latter from flowing away from the starter wall towards the floor or floors. The starter wall sets and hardens at the same time as the walls and the floors. Consequently the construction of this starter wall requires no time additional to the time necessary for the setting and hardening of the walls and the floor.

It may be seen that in this way appreciable time is gained during the construction.

I claim:

1. A starter formwork for casting concrete starter walls simultaneously in one operation with structural members produced by casting concrete in the space between shutterings of a main formwork, comprising:

at least one side member means defining at least one lateral surface of a starter wall,

at least one end member means for defining an end face of said starter Wall,

means for releasably supporting said at least one side member means on said at least one end member means,

said at least one end member means having means for engaging a shuttering, said at least one end member means formed with a tapering surface adjacent said concrete to be hardened for easy release from said hardened concrete, and

said side member when supported on said at least one end member means and said end member having a height corresponding to the height of the starter Wall to be produced.

2. The starter formwork, as set forth in claim 1. wherein said at least one side member means comprises two angle members,

said supporting means for supporting said two angle members in spaced relation, and

said two angle members and said at least one end member means defining a space equal to the width of the starter wall to be produced.

3. The starter formwork, as set forth in claim I, wherein:

said at least one side member means and said at least one end member means are adapted to be placed in spaced relation to a shuttering of said main formwork to define between them a space equal to the width of the starter wall to be produced.

4. A starter formwork for casting concrete starter walls simultaneously in one operation with walls and floors cast between shutterings of a main formwork, comprising at least one end member means,

two side members releasably supported in spaced apart relationship by said at least one end member means and having a height in the supported position cor responding to the height of the starter wall to be produced,

said at least one end member means including means for resting on the upper portion of the shutterings, and

said at least one end member means including a tapering surface to facilitate release thereof from the hardened concrete.

5. The starter formwork, as set forth in claim 4. wherein said at least one end member means is substantially wedge-shaped, said resting means comprises flanges on said at least one end member means for resting on the edges of said shutterings and for receiving said side members, and

tie rods extending through said two side members and said at least one end member means for releasably holding said two side members in engagement with said at least one end member means.

6. The starter formwork, as set forth in claim 4, wherein said at least one end member means is formed at the lower portion thereof with a recess which permits reinforcement bars of a wall and floor member to extend therethrough so that said at least one end member means can be placed in position and re moved again.

References Cited UNITED STATES PATENTS 2,658,252 11/1953 Avril 249--39 X 2,930,096 3/1960 Haber 249-16 2,575,678 11/1951 Olson 249-19 X 3,376,010 4/1968 Myer 249l3 I. SPENCER OVERHOLSER, Primary Examiner J. S. BROWN, Assistant Examiner US. Cl. X.R. 24934