ES2224393T3 - ALVEOLAR Slab OF CONCRETE WITH SAFETY DEVICE. - Google Patents

Abstract

Alveolar slab of prestressed or not prestressed concrete, consisting of a concrete body that includes a series of longitudinal cylindrical alveoli (2) and reinforcement irons (3) arranged below them in use position, this slab being destined to be used as floor element for the construction of any type of building, said slab behaving arc-shaped reinforcements (5) fixed on the armor irons (3) and arranged in transverse planes to the armor irons so that they pass over a part or all of the alveoli (2) characterized in that the arc-shaped reinforcements (5) are fixed in the reinforcement irons (3) only on the two ends of the slab so that they reinforce the upper part of the concrete only in the area on which the lifting efforts caused by manipulation hooks (6) inserted in said cells are exerted, said arcs being fixed on armor irons (3) by welding or by means of loops.

Description

Alveolar concrete slab with device security.

The object of the present invention is a slab concrete socket that involves a handling device of security.

It refers in a general way to the sector industrial building construction of all kinds and is aimed at improving the solidity and handling conditions of precast concrete slabs prestressed or not, lightened by means of longitudinal cylindrical alveoli.

Currently, in France, the realization of Building floors essentially use two techniques:

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the solid slab cast in situ that has two main drawbacks: a significant implementation time due to the placement and removal of the formwork and the construction of the reinforcement and especially a high weight that requires consistent foundations, in particular for buildings with numerous floors.

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the brick or concrete slabs that, in relation to the slab solid, can significantly lighten the construction, but at price of a labor time that entails a cost of often excessive realization. This technique indeed needs the previous placement of a series of nearby beams among which a large number of floor slabs are placed manually. Also the face bottom of the work composed of elements of different textures hinders the completion work.

The concrete floor of alveolar slabs, which it constitutes a technique called to develop rapidly in France and which is already widespread in some neighboring countries, It allows to greatly alleviate the aforementioned inconveniences.

The honeycomb slab is a prefabricated hollow slab of reinforced or prestressed concrete, which can be used as soil element in the construction of both collective housing or individual, such as buildings for professional use such as schools, shops, hospitals, hotels and offices, or even factories, warehouses, parking lots, decks, terraces, etc. Must note that the alveoli constituted by hollow cylindrical parts for the passage of sheaths or cables.

Alveolar slabs are normally manufactured in a vibrant mold open at the top. Face in contact with the bottom of the mold is smooth, the face being rough opposite, outdoors at the time of laundry. When the slabs they have to be painted directly, they are used with the smooth part down. If they have to be plastered or have to receive a coating, are used with the rough part below. This face, located in the manufacturing on the open side of the mold where it poorly controls the surface is therefore irregular. The layer of Plaster adheres relatively badly.

For the realization of floors, the honeycomb slabs against each other, joined, and keyed with concrete The implementation is very fast and is carried out generally without struts or scaffolding, resting the slabs only by its two limbs on edge beams previously placed.

Very often the armor is formed with threads of longitudinal steel arranged only at the bottom, below the alveoli. The manipulation is done in general with crane, with the help of hooks that are inserted in the alveoli on both ends of the slab. The absence of armor in the upper part becomes fragile and it has happened that it breaks by on the hooks causing the slab to fall causing sometimes more or less serious accidents.

Some honeycomb slabs, such as described in patents Nº BE 858 167 (in the name of CUYVERS) and Nº DE 2 422 192 (on behalf of Otto HOFMANN), in all their length, transverse reinforcements that pass over the alveoli These armors uselessly increase the cost price of the slabs Indeed, the top of the latter is subjected only to compression forces and only arches located at the extremities have a rationale when the manipulation is carried out with hooks inserted in the alveoli. By the way, it should be noted that these hooks cannot be used when the limbs of the slabs once placed are Too close to a wall

Other honeycomb slabs involve loops of steel lifting provided at the ends of the slabs. However, this system needs a special rented rocker. by the manufacturer. In addition, the arrangement of loops located in  slab reinforcements make the manufacturing more complex and therefore more expensive.

The device according to the present invention has in order to remedy these inconveniences. It allows indeed without significantly increase the manufacturing cost of the slabs alveolar, handle them with total safety with the hooks of current type lift, even when the limbs of These slabs are very close to a wall.

It consists of single or multiple arcs arranged in the transverse planes only in the two slab extremities, mounted on the longitudinal irons of armor and that pass over all or part of the sockets so that they only reinforce the concrete part on that the lifting efforts caused by the handling hooks inserted in the alveoli, being able to extremities also have holes to insert the hooks above.

In the attached drawings, given as non-limiting example of embodiments of the object of the invention:

Figure 1 is an axonometric view of a slab honeycomb according to the invention.

Figures 2 and 3 illustrate the use of a handling hook, inserted respectively in the limb of a slab and removed from this limb,

Figure 4 is a partial view showing a safety arc mounted on the end of the irons of the armor of a slab,

Figure 5 is a view at one end of a slab showing the assembly of a double arch

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and Figure 6 is a partial view representing the underside of a striated slab to facilitate hitching of plaster or coating.

The device according to the invention is applied to alveolar slabs 1 similar to that shown in figure 1 and constituted by a concrete body that involves a series of 2 longitudinal cylindrical alveoli and 3 armor irons generally parallel to these alveoli arranged in the part lower.

These slabs, made of vibrated concrete prestressed or not, they are of substantially trapezoidal section and they usually have one or more ribs on their sides 4 intended to allow the keyed concrete cast by on top of it, hold on and form a perfectly Solidarity

The honeycomb slabs 1 according to the invention they involve, in particular near each of their limbs, some complementary armor in the form of arcs 5 fixed in the longitudinal irons 3 and that pass over all or part of the alveoli 2. These arcs confer on the upper part from the slab a solidity that allows to securely secure your manipulation by means of lifting hooks 6 (figure 2).

These arcs can be simple (figures 1 and 4) or multiple (figure 5) and are preferably made of steel with common concrete, but may be made of another metal or synthetic material reinforced with glass or carbon fibers. its fixing on the longitudinal irons 3 of armor can be effected by means of loops, welding or any other means appropriate.

To allow the hooks to be used 6 manipulation even when the slab tips once placed against a wall, or too close to it, Alveolar slabs 1 according to the invention may involve arcs 5 arranged at a certain distance from said extremities and associated with previously practiced holes 7 that allow insert the hooks 6 into the alveoli above the slabs 1 (figure 3).

In order to improve the adhesion of the coating or plaster, the bottom of the mold will involve advantageously grooves or ribs so that it obtain a striated underside 8 of the honeycomb slabs 1, can these stretch marks be longitudinal (figure 5) or present Any other configuration.

It should be noted that the arrangement of the arches 5 of armor does not need any means modification usual manufacturing of honeycomb slabs and in particular not hinders the placement and extraction of the training nuclei of the alveoli that move parallel to the axis of the slab.

The positioning of the various elements constitutive gives the object of the invention a maximum of effects useful that, to date, had not been obtained with devices Similar.

Claims (5)

1. Alveolar slab of prestressed concrete or not, constituted by a concrete body that involves a series of alveoli (2) longitudinal cylindrical and reinforcement iron (3) arranged below them in use position, being This slab intended to be used as a floor element for the construction of any type of building, with said slab arc-shaped armor (5) fixed on the irons of armor (3) and arranged in transverse planes to the irons of armor so that they pass over a part or the all of the alveoli (2) characterized in that the arc-shaped reinforcements (5) are fixed in the reinforcement irons (3) only at the two ends of the slab so that they reinforce the upper part of the concrete only in the area on which the stresses are exerted lifting caused by manipulation hooks (6) inserted in said sockets, said arcs being fixed on the armor irons (3) by welding or by means of loops. 2. Alveolar slab according to claim 1, characterized in that the arches (5) are associated with previously made holes (7) that allow the manipulation hooks (6) to be introduced into the alveoli (2) above said slab. 3. Alveolar slab according to any one of the preceding claims, characterized in that the arches (5) are made of metal. 4. Alveolar slab according to claim 1, characterized in that the arches (5) are made of synthetic material reinforced with glass or carbon fibers. 5. Alveolar slab according to any one of the preceding claims, characterized in that it has a striated underside (8) so as to improve the adhesion of the coating or plaster.