FR2916781A1 - Continuity box's caisson for edifice, has metal runner whose surface in which rods are emerged before being incorporated in construction part is opened, where caisson is closed with respect to concrete laitance by thermoplastic envelope - Google Patents

Abstract

The caisson has a metal e.g. black steel, runner (1) whose surface in which metal connecting rods (3) are emerged before being incorporated in a concrete construction part e.g. wall, is opened. The caisson is closed with respect to a concrete laitance in a sealed manner by an envelope i.e. film (2), made of retractable thermo plastic material i.e. low density polyethylene. The surface of the runner is equipped with reentrant lateral edges to cooperate with the rods and to maintain the rods within the caisson along a position determined by an operator.

Description

BOX OF PENDING BOX AND WAITING BOX INCORPORATING SUCH A BOX

  FIELD OF THE INVENTION The invention relates to the field of construction and more particularly to a new box structure for a waiting box.

  A waiting box is a support device for reinforcing links between two parts of a structure made of reinforced concrete, and which encloses the folded ends of the reinforcements, the apparent part of which is intended to be embedded in the concrete of the concrete. one of said construction elements.

  PRIOR ART In a known manner, during the construction of a building comprising several reinforced concrete elements, in particular walls or slabs, is positioned on the upper or lateral ends of said elements, metal reinforcements intended to ensure a mechanical connection with the adjacent elements. , and thus confer a cohesion to the whole.

  These metal reinforcements comprise a part which is embedded in the first element, and a second part which will be embedded in the adjacent element during its realization, in particular during the pouring of the concrete.

  These reinforcements must be held in place during the pouring of the concrete of realization of the first element, and are generally partially contained inside a device called waiting box, constituted of a box which encloses the folded ends of the reinforcements, while leaving exposed the part of the reinforcement that will be embedded in the concrete of the first element.

  After pouring the concrete of the first element, eliminating the waiting box to reveal the ends of the reinforcements which have been isolated from the concrete, and unfolding the folded ends of said reinforcements, intended to be embedded inside the adjacent concrete element.

  Such waiting boxes are now widely known. Thus, there are wood, metal, cardboard and also plastic.

  The use of caissons made of steel faces a major drawback. Indeed, since it implements such a material, it remains inside the concrete of the first part of the completed work. In doing so, in addition to the fact that the maintenance of the box within the concrete structure does not bring any positive result, it is frequently observed if the coating has not been satisfactory.

  The present invention aims to overcome this disadvantage.

  SUMMARY OF THE INVENTION It relates to a box of waiting box for the establishment of reinforcing links between two parts of concrete structure in which the box consists of a metal rail, the face of which the level from which the connecting armatures to be incorporated in the first part of the concrete structure are opened, and in which the casing is closed to the sealing faces vis-à-vis the concrete laitance by an envelope or sleeve of heat-shrinkable plastic material.

  In doing so, first of all, the primary requirement for the implementation of such holding boxes, namely the protection of the part of the connecting armatures intended to be integrated in the second part of the structure, is satisfied. in concrete during the realization of the first part, and in parallel, the possibility of removing the box after completion of the first part of the work insofar as, due to the presence of the plastic envelope, it There is no adhesion with the metal part of the box.

  According to the invention, the open face of the box, that is to say the face at which the connecting armatures emerge, is provided with recessed lateral flanges, that is to say directed towards the inside of the box. , so as to cooperate with the connecting armatures and corollary to maintain them within the box according to the position determined by the operator.

  According to another advantageous characteristic of the invention, the bottom of the rail is pierced with at least one through-light, in order to allow the extraction of said rail by simple insertion of a tool conventionally encountered on construction sites and in particular a hammer.

IBREVE DESCRIPTION OF THE DRAWINGS

  The manner in which the invention can be realized and the advantages which result therefrom will emerge more clearly from the exemplary embodiment which follows, given by way of indication and not by way of limitation, in support of the appended figures.

  Figure 1 is a schematic perspective representation of a first embodiment of the invention. FIG. 2 is a diagrammatic cross-sectional representation of the waiting box of FIG. 1. FIG. 3 is a diagrammatic perspective view of a second embodiment of the invention. FIG. 4 is a diagrammatic representation in section of the waiting box of FIG. 3. FIG. 5 illustrates the bottom of the box according to an advantageous embodiment of the invention. FIGS. 6a, 6b, 6c illustrate the extraction operation of the waiting box by implementing the particular embodiment of FIG. 5.

  DETAILED DESCRIPTION OF THE INVENTION According to the invention, the box constituting a waiting box basically comprises a rail 1 made of metal, and in particular cold-rolled steel (also called black steel), or galvanized steel. This rail is defined by three sides respectively bottom 8 and two side faces. In doing so, it defines an open face, opposite the bottom 8, at which emerge a portion of the metal binding armatures 3, intended to be integrated in the first part of the concrete structure to achieve.

  The other part of the connecting armatures 4 is folded inside the defined volume by the rail 1.

  According to a characteristic of the invention, the rail 1 is closed by a thermoplastic film 2, typically made of low density polyethylene. To do this, once the rail 1 is made, it sleeves it in a plastic sheath and subjecting the assembly thus made in an oven to the fms to raise the temperature to result in the heat shrinkage of the envelope. Under the effect of this phenomenon, the film adheres to the three faces of the rail 1 and is stretched on the upper open face. The bending reinforcements 3 are then manually inserted, the plastic envelope being pierced by these reinforcements, without this drilling exceeding in diameter that of said reinforcement thus slid, because of the quality of the plastic material used. . The upper and lower ends of the waiting box thus produced are sealed by said envelope, which is retracted on each of the four sides of the box.

  In doing so, it ensures the tightness of the volume defined by the rail and closed by the thermoplastic envelope 2 vis-à-vis the concrete laitance during the realization of the first part of the concrete work carried out.

  The thermoplastic film 2 ensures a certain maintenance of the connecting armatures 3. To optimize this maintenance, and according to one embodiment shown in relation to FIGS. 3 and 4, the rail 1 is provided at its open face, opposed to the bottom 8, re-entrant flanges 5 so as to cooperate with the parts 3 of the connecting armatures. Due to the relatively elastic nature of these connecting plates, which are provided a spacing of the two strands which constitute slightly larger than the distance separating the two respective free edges of the re-entrant flanges 5, the positioning is reinforced according to the will of the operator or according to the manufacturer's recommendations within the waiting box thus defined.

  Due to the presence of this thermoplastic envelope 2 completely surrounding the rail 1, it leads to easy stripping of said boxes. Indeed, there is no more interaction possible between the concrete and the steel or the constituent metal of the box.

  Advantageously and in order to facilitate this stripping operation, the bottom 8 of the box is provided with through-holes 6 and 7. As can be seen in FIGS. 6a, 6b and 6c, the stripping is carried out by simple insertion. , for example of a hammer, at the level of the upper light 6. The operator provides a simple traction to release the rail 1 of the concrete 9 and thus to access the folded parts 4 of the binding frames 3. The second traversing light 7 makes it possible to further favor this formwork additionally, in the case where the depth of the rail induces higher friction forces in order to be able to release said rail.

  The folded parts 4 of the reinforcements have only to be unfolded to allow the realization of the second part of the concrete structure to achieve.

  It is conceivable in fact all the advantages of the present invention which allows a simple way 5 to make metal waiting boxes without requiring significant additional cost and promoting the formwork of these boxes waiting. 25

Claims (5)

  1. Box of waiting box for the establishment of reinforcing links (3, 4) between two parts or two concrete elements of work, said box consisting of a metal rail (1), whose at the level of which the connecting armatures (3) to be incorporated in the first part of the concrete structure are opened, characterized in that the box is closed to the sealing faces vis-à-vis the milt concrete by an envelope (2) made of heat-shrinkable plastic material.   2. box crate according to claim 1, characterized in that the plastic material constituting the casing (2) is low density polyethylene.   3. crate box according to one of claims 1 and 2, characterized in that the open face of the box, that is to say the face at which the connecting armatures (3) emerge is provided recessed lateral flanges (5), intended to cooperate with the connecting plates (3) and corollary to maintain them within the box according to the position determined by the operator.   4. Box of waiting box according to one of claims 1 to 3, characterized in that the bottom (8) of the rail (1) is pierced with at least one through hole (6, 7), to allow extracting said rail by simply inserting a tool conventionally encountered on construction sites and in particular a hammer.   5. Waiting box including a box according to one of claims 1 to 4.