FR2801620A1 - Prefabricated concrete staircase has precast concrete treads with lugs connected by cast in metal beam - Google Patents

Abstract

The prefabricated concrete staircase is formed by assembling tread sections. Each tread section has a tread proper (2) with a lower lug defining a transverse opening extending in a plane concurrent to that of the tread. The openings define a linear continuous opening when the treads are assembled. The opening receives a metal reinforcing armature before filling with cement to form a connecting beam (7) for the staircase. The lug and openings are formed integrally with each tread during moulding.

Description

The invention relates to a straight staircase of the prefabricated concrete type.

Prefabricated staircases are nowadays widely used, to the extent that they allow first of all, to realize a substantial gain of time, especially when laying the staircase on the site, and secondly , a gain in terms of sales.

Among the stairs of the prefabricated type of the prior art, one can for example cite that described in EP-A-0 126 681.

This consisting of a silt, previously set up between the two floors or the two places to connect by the staircase, said silt being provided with a number of notches on its upper face, formed at regular intervals, and intended to receive base or anchor foot of each step member, said anchor foot continuing vertically to form the riser of the immediately adjacent upper step. Each of the steps further comprises a shoulder, intended to be positioned against said riser of the lower step.

Although technically satisfactory, this type of staircase therefore requires the prior implementation of a slime, which should first be made and then put in place, before actually proceeding to the laying of constitutive elements of the markets.

The object of the invention is to simplify, of course, the installation of stairs, but also its realization, in particular avoiding the realization of such a silt.

This staircase according to the invention is therefore a prefabricated straight staircase in concrete, constituted by the assembly of prefabricated step elements, and is characterized in that said walking elements are each constituted by a step proper, provided on its lower face of a structure defining a through-light oriented in a direction concurrent with the plane of said step, and defining when the elements are assembled, a linear and continuous cavity intended firstly to receive a reinforcement mechanical reinforcement, then to be filled with concrete, so as to ensure cohesion to the whole. in other words, the invention consists in dispensing with any additional installation or support structure, insofar as said supporting structure and the cohesion of the staircase are integrated with the steps themselves.

Advantageously, the concrete used is self-placing liquid concrete, which, given the small slope of the beam to be produced, favors the filling of the cavity which constitutes.

According to another embodiment for stairs of greater width, may be envisaged to provide several support cores.

the way 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 limitation in support of the appended figures.

Figure 1 is a schematic perspective view of the prefabricated straight staircase according to the invention.

Figure 2 is a schematic longitudinal sectional view of the staircase of Figure 1.

Figure 3 is a schematic perspective view of one of the constitutive walking elements of said staircase, Figure 4 is a front view.

schematically represented the straight staircase according to the invention. stairway is made by assembling prefabricated concrete walk-through elements said step elements (1) defining, when assembled together, supporting beam (7), the structure and architecture of which will be described in more detail detail below.

Basically, the elements (1) constituting the steps are in the form of a step itself (2), having below the tread, a structure (3) defining a volume provided with two through ends (4). The general orientation of this volume is concurrent with the walk (2) in particular towards the rear part of the step, as can be observed better, especially in Figure 2. When the steps are assembled together, as as can be seen in FIG. 2, the volumes (4) of each of them are contiguously joined to each other, so as to define a linear cavity (S) or core, intended to receive everything from first a reinforcement, traditional type, then once the reinforcement in place and fixed to be filled with liquid concrete, including self-consolidating, employing adjuvant of the type marketed by CHRYSO.

As can be seen in the various figures, the structure for defining the support core is integrated into the back of each of the steps. The set of each step is therefore directly derived from molding. However, in another embodiment, could be considered to report said structure at the back of the steps by any known means.

It is conceivable for the great ease of implementation of such stairs since it is sufficient to lay the steps on a basting one after the other, to wedge in this position, and then to ensure the establishment of the reinforcement and the concrete filling, to achieve, after a drying phase, the final staircase.

In addition, it is possible to play at the joint between the steps to get the height of the desired stair.

In an unrepresented variant of the invention, each step receives not one but two structures intended to provide support. These two structures are naturally parallel to each other, and arranged in the vicinity of the lateral edges of the steps considered. In this way, it is possible to make prefabricated straight stairs of relatively large width, by implementing the walking elements characteristic of the invention.

It is therefore easy to conceive that, in addition to the ease of setting up such a staircase, the invention also makes it possible to overcome the problems associated with the storage and transport of the constituent elements.

Claims (1)

 CLAIMS Precast concrete straight staircase, constituted by the assembly of prefabricated step elements (1), characterized in that said step elements each consist of a step itself (2), provided on its underside with a structure (3) defining a through-light oriented in a direction concurrent with the plane of said step, and defining when said elements are assembled, a cavity (5) linear and continuous, intended firstly to receive a reinforcing reinforcement mechanically, then to be filled with concrete, so as to constitute a support beam (7) ensuring mechanical cohesion to the staircase. Prefabricated straight staircase according to claim 1, characterized in that the cast concrete is self-placing liquid concrete. Prefabricated straight staircase according to claim 1, characterized in that the cast concrete is a conventional concrete. Prefabricated straight staircase according to one of claims 1 to 3, characterized in that said structure (5) is integrated with each of the step elements during molding of the element in question. 5. Prefabricated straight staircase according to one of claims 1 to 4, characterized in that each of the step elements (1) comprises two structures (5), formed under the step itself (2) in the vicinity of the side edges, of so as to constitute, during the assembly of said elements (1), two support beams.