Description.

The invention relates to a pref br cated element for floor construction.

The prior art in the construction field teaches many types of floors. Some of the most commonly used types, used especially for reasons of s ee , are attices with prefabricated elements made in reinforced concrete (prestressed or not), made in the form of beams and cast in moulds a factory. Also known are floors in pref b icated elements in reinforced clay, constituted by breeze brick in ceramic cotto, which are assembled in a factory in rows of predetermined lengths, and connected up using metal rods and finally sealed with mortar so that beams are formed. In some cases the construction of floors with prefabricated elements such as those above is done simply by lining up the elements without ap l ϊn-j secondary structures. In other cases (mixed-structure floors) on tloor_. assembled on reinforced concrete beams or tiles

secondary structures are laid to complete the floor construction,: for example, ceramic breeze blocks or foam polystyrene are used. The residual spaces left between the beams are also filled with polystyrene blocks, with the aim of reducing final floor weight, to deaden sound transfer and increase floor insulation. The blocks, whether in ceramic material or polystyrene, are ar anged in a line between the ribs of the beams.

The present invention provides a mixed structure for floors, which thus enjoy advantages offered by such mixed structure, in particular l ightness and good sound insulation and heat insulation, for which no secondary structure is necessary, providing a prefabricated element which enables rapid floor construction with excellent sound and heat insulation.

An advantage of the present invention is that it improves the above characte istics of usu l mixed- structure floors, inwhich the presence of sound and thermal conductors considerably limits said charact isties.

A further advantage is that with the invention a particularly light floor can be built, without the need for shoring during real zat on.

The above aims and advantages are al I achieved by the element which is the object of the invention, as it is set out in the accompanying claims. Further characteristics and advantages of the invention will better emerge during the detailed description which follows, of a preferred but non¬ exclusive embodiment of the invention here offered solely in the form of a non-limiting example in the accompanying drawings, in which: - figure 1 shows a schematic straight transversal section of a prefabricated element;

- figure 2 shows a perspective view of a length of floor made with the element of figure 1. With reference to the figures, 1 denotes a prefabricated element for the formation of floors, substantially constituted by a first beam 2 in foam polystyrene and a beam 3 in reinforced concrete, both having equal length to the floor length to be built. The beam 3 is f r ed by an i on structure 3a and a cement base 3b.

The base 3b of the beam 3 is housed i a longitudinal seat made within the body th=* first beam 2 functioning as a casting mol during the realisation of said base. An aperture 5 is provided on the upper- surface of

the polystyrene beam 2, at the halfway pent of the beam. The aperture extends longitudinally for the whole length of the beam 2 and sets the seat U which the base 3b is housed in in communicat on with the outside.

Through the aperture 5, which is slightl narrower than the width of the base 3b of the beam 3 , the structure 3a can be inserted and the base 3b can be cast in the seat 4 of the polystyrene beam functioning as a casting mold. The seat is positioned in proximity of the lower surface of the polystyrene beam 2 and surrounds the base 3b of the beam 3. The seat U exhibits a surface with a recess 6 which, whwn the beam 3 is cast in the seat _. , is in contact with a correspond ng projecting surface of the beam 3.

A shaped lateral projection 7 is arranged long one of the sides of the first beam 2. A corresponding recess 8 is predisposed along the opposite side of the first beam 2, and joints wi h the lateral projection 7 of an adjacent prefabricated element 1. In the embodiment of he figures the recess and projection have __ semicircular section but they <_.ould be of a

different shape.

A net 9 is gripped on the lower surface of the element 1 to enhance the solidity of he plaster , applied after the construction of the floor, on the bottom of the element 1.

The single elements 1 are realized in the factory and utilized, one by the side of another, for the construction of floors. The joint realized by the projections 7 and the recesses 8 enhance the solidity of the whole structure. In figure 2 a length of floor is shown, compr ising two elements 1 side-by-side.

After the laying of the elements 1 the construction of the floor proceeds according to usual techniques, with the laying of the plaitei on the lower surface and the pavement fl or on the upper surface.

The floor realized by means of the invention is completely without heat or sound communicati n bridges. A layer of pol ystyrene , provided with absorbent and insulating qualities, is present along the entire length of the floor, without: any breaks, even though it is less thick at the seats k of the bases of the beams 3.