FR2551482A1 - BEAMS FOR THE MANUFACTURE OF INSULATING FLOOR AND FLOOR COMPRISING SUCH BEAMS - Google Patents

Abstract

THE BEAM10 IS OF THE LATTICE TYPE WITH A REINFORCEMENT11 WHICH THE LOWER PART IS FLOODED IN A TALON12. THE LATTER IS MADE OF LIGHT INSULATING CONCRETE, FOR EXAMPLE A MIXTURE OF HYDRAULIC BINDER, POLYSTYRENE BALLS AND WATER. THE ENDS14, 15 OF THE BEAM CAN BE IN CLASSIC CONCRETE TO ENSURE A GOOD SPAN ON THE SUPPORTS.

Description

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  BEAMS FOR THE MANUFACTURE OF INSULATING FLOOR AND FLOOR COMPRISING SUCH BEAMS.

  The present invention relates to beams intended for the manufacture of an insulating floor and comprising a metal frame 05 and a heel in which the lower part is embedded

of the frame.

  Energy saving requirements and regulations

  impose thermal insulation of floors The solution consisting in adding an insulation under the floor is not easy to carry out technically and economically.

  It was proposed in patent FR 78 31 719 in the name of the applicant to produce beams with a heel housed in an insulating element having served as formwork for pouring concrete from the heel The use of these beams allows, in combination with 15 insulating interjoists, to directly obtain a soffit

insulating for the floor.

  The object of the invention is to provide beams

  also making it possible to directly produce floors with an insulating underside, while simplifying the manufacturing and handling of the beams as much as possible.

  This goal is achieved by a beam of the type defined in

  head of the description, in which, in accordance with the invention, the heel is essentially made of light insulating concrete, the holding

  mechanical of the beam being provided by the frame.

  The use of light insulating concrete to form the heel of the beams brings very many advantages compared to the heel beams of conventional concrete housed in an insulating element. First, the thermal insulation is easy to carry out and to control since it essentially depends on the thickness and the density of the light insulating concrete used. Next, the weight of the beams is considerably reduced - a division of the weight by two, or even three, is possible - which greatly facilitates handling on site In addition, the lightweight insulating concrete 35 provides protection of the reinforcement against the

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  corrosion and allows the beam to benefit from its good fire resistance. In addition, shoring is possible directly under the beam, which is more delicate when an insulator is added on the underside, and the underside of the heel can be plastered. 05 directly, which is not the case for most insulators.

  Light insulating concrete is, as known per se, produced with a mixture comprising a hydraulic binder (cement), particles of expanded polymer (for example beads of

polystyrene) and water.

  To ensure a good bearing on the supports, it is possible to make the ends of the heel in a material more resistant than light insulating concrete, for example in conventional concrete. In this way, protection is also achieved.

  lightweight insulating concrete during handling and transport.

  A particular embodiment of the invention is described below, by way of indication but not limitation, with reference to the accompanying drawings in which: FIG. 1 ′ is a view in cross section of a part of the insulating floor comprising beams according to the invention, and Figure 2 is a longitudinal sectional view of a

  floor beam in Figure 1.

  As shown in FIGS. 1 and 2, the beams 10 according to the invention are of the lattice type with a metallic frame 11, for example triangulated, the lower part of which is embedded in a heel 12 made of light insulating concrete The beams are prefabricated in the factory in the same way as standard truss type beams provided with a conventional concrete heel, the conventional concrete being replaced by a light insulating concrete, the thickness e of which may be greater For the determination of the mechanical strength of the beam, only the stretched steel section of the reinforcement is involved in the calculation, the insulating concrete

light not being taken into account.

  The ends 13, 14 of the beam intended to come in bearing on the supports are made for example of conventional concrete, the connection between this and the light insulating concrete

no problem (Figure 2).

  For the production of an insulating floor, the intervals between beams are filled with insulating interjoists 15, by

  example also made of lightweight insulating concrete (Figure 1).

  Thus, conventionally, a so-called compression slab is poured on the beams 10 and interjoists 15, to take up the compression forces, while the tensile forces are taken up by the reinforcement of the beams. An insulated floor is thus obtained directly 10 on the underside.

  Preferably, the light insulating concrete of the heel 12 is at

  base of expanded polystyrene beads mixed with a hydraulic binder and water It is thus possible to produce a light insulating concrete whose density can drop to 15 2 kg / m 3.

  As an indication, a beam according to the invention has

  was performed as follows.

  Two end pieces 13, 14, for example heel sections made of common aggregate concrete, are positioned between two metal sections forming the lateral cheeks of the formwork into which the light insulating concrete is to be poured. The pieces 13, 14 form the formwork end walls The light insulating concrete used is of liquid consistency based on expanded polystyrene beads with a density of 3 kg / m 3 A conventional truss type reinforcement 25 is positioned after pouring the light insulating concrete The end pieces 13, 14 have grooves formed in their upper face to receive the lower profiles of the metal reinforcement. Thus, these end pieces have three functions: lost formwork allowing the dimensioning of the beam in length, reinforcement shims and transmission. compression forces when using

the beam.

  The tests carried out on a single beam or on a floor demonstrate a mode of behavior identical to 35 conventional beams with slightly greater flexibility

  for an equivalent steel section.

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Claims (3)

  1 beam intended for the manufacture of an insulating floor and comprising a metal reinforcement and a heel in which the lower part of the reinforcement is embedded, characterized in that the heel is essentially made of light insulating concrete, the mechanical strength of the beam being insured by the frame.   2 beam according to claim 1, characterized in that the heel of the beam is made from a mixture 10 comprising a hydraulic binder, polystyrene balls and water.   3 beam according to any one of claims 1   and 2, characterized in that the ends of the heel intended to rest on supports are made of a more resistant material than the light insulating concrete forming the rest of the heel.