FR2539169A1 - Formwork casing for concrete structures - Google Patents

Abstract

The invention relates to the types of special formwork for concrete structures. It is made of a malleable synthetic material which is strong and not subject to deterioration. It is cut up into strips of variable sizes, either in the form of two cheeks joined to a bottom, or in the form of a single strip. Among the more advantageous applications of the invention, mention may be made of the permanent and finished formwork of reinforced concrete beams or ties, or even the bases for boundary walls and houses.

Description

Enclosure formwork for concrete structure
The present invention relates to the types of formwork making it possible to produce concrete structures mainly in the form of beams or beams either in infrastructure or in superstructure.

In known devices of this kind, the various types of formwork are constituted either by rigid panels of wood, metal or other materials, or by prefabricated molds, or produced on site with boards. Such devices are difficult to use, heavy, long and difficult to implement, requiring in most cases a formwork and often requiring the creation of a coating or patching to obtain a finished appearance of the cast work.

The following envelope formwork The invention avoids these drawbacks.

It is in fact made of malleable synthetic material, which is both flexible and rigid, resistant and unalterable, cut in the form of a strip and which can be used entirely to the dimensions of the project to be carried out; intended to remain permanently attached to the cast work and having a clean and finished appearance.

According to a first variant, the envelope formwork consists of two cheeks and a bottom.

According to a second variant, the envelope formwork consists of a single cheek.

The device according to the invention makes it possible to quickly form and challenge nitivenent - reinforced concrete beams in superstructure - concrete beams in infrastructure
The accompanying drawing is a plan view with lines of the two variants.

As shown, Figure 1 is a strip section in plan view of the first variant. The cheeks 1 are secured to a bottom 2. The junction between the cheeks 1 and the bottom 2 is materialized by two folding primers 3 which primers 3 are reinforced by a frame 7 incorporated in the r.iatière (see figure ~ 4 next section BB). The inner face of the cheeks intended to receive the concrete comprises waves (see FIG. 3 following section A.A.).

These waves intended to stiffen the envelope to resist the thrust of the concrete during pouring can possibly be reinforced by metal rods 6 incorporated in the material (see figure 3 according to section AA)
Each end of the cheeks has a shoulder 4 with holes 5 at fairly close intervals. These holes are intended to receive bent metal rods 8 previously (Figures 6 and 7) which rods 8 maintain the spacing.

The external face of the cheeks or the epidermis intended to remain visible can have several aspects either smooth or colored to avoid an application of paint, or with a metal mesh 9 projecting (see FIG. 7) to receive the adhesion of a future coatings
FIG. 2 represents a section of unitary strip seen in plan for the application of the second variant0
This strip also includes waves 1 on the inner face but has two shoulders 4 at each end; these two shoulders 4 also have holes 5 (see FIG. 5 following section CC) to receive the metal spacer rods 8.

FIG. 6 represents the implementation of a beam cast in superstructure. We place the strip with bottom, cut to the desired length on a shoring it (which shoring is not an integral part of the invention) 0 We place the reinforcement 10 of the beam on the bottom 2. We fold the cheeks there and place the bent metal rods 8 in the holes 5 of the shoulders 4. The beam is ready to be cast.

Figure 7 shows the implementation of a sill cast on the ground.

Two cheeks are held held parallel by bent metal rods 8 incorporated in the lower shoulder 4o. The frame 10 of the sill is positioned. Next, the second cheek is placed, then the spacer rods 8 in the upper part. The sill is ready to be poured.

The strip flow makes it possible to obtain unique lengths without joints. In the corner case, the malleable material can be easily cut. The connection is made using adhesive tape. The height of the cheeks 1 and the width of the bottom 2 are variable according to the desired sections.

The device, object of the invention, can be used in all cases of making reinforced concrete structures, particularly in the form of beams or beams.

Particularly interesting applications can be the rapid, finished and precise production of concrete beams or sills on wells for the foundation of houses or buildings or even the foundations for the walls of fences or houses.

Claims (3)

Cheeks I and a bottom 2.The junction between the cheeks I and the bottom 2 is materialized by two folding primers 3 which are reinforced by a frame 7 incorporated in the material. The inside face of the cheeks intended to receive the concrete and its IO reinforcement comprises waves. These waves intended to stiffen the envelope to resist the thrust of the concrete during casting can optionally be reinforced by metal rods 6 incorporated in the material. Each end of the cheeks has a shoulder4 with holes5 to fairly close intervals.  I. Enclosure formwork for concrete structures, made of aesthetic, malleable, flexible, resistant, and unalterable material, debitable in the form of a band and capable of being fully implemented according to the dimensions of the project to be carried out, characterized by: These holes are intended to receive bent metal rods8 which maintain the distance. The outside face of the cheeks may have a smooth appearance or may include a metal mesh9 to receive the adhesion of a coating.  2. Formwork envelope according to claim I characterized in that the envelope consists of two cheeksI and a bottom2.  3. Formwork envelope according to claimi characterized in that the envelope consists of a single cheek.