FR2708301A1 - Process for the production of prefabricated concrete soundproofing products and product obtained. - Google Patents

Abstract

The invention relates to a process for the production of prefabricated sound-absorbing concrete products and the product obtained. The process for the manufacture of sound-absorbing prefabricated concrete products consists of pouring concrete (10) on a structure of sound-absorbing material (11) already installed at the bottom of a formwork (12) making it possible to form the product.

Description

Process for the manufacture of prefabricated soundproofing products in

  concrete and product obtained. The present invention relates to a method for manufacturing ready-to-use CAV and CAP vibrated concrete soundproofing products for the production of

reduced acoustic levels.

  As experts in the field know, in all industrialized countries, efforts have been made for years to

fight noise.

  Indeed, precise standards prescribe sound pressure levels, "L.P.S.", measured in dB "A" which limit the noise in order to preserve the health of people at their place

of work.

  To do this, three main actions are to be undertaken: 1) Reduction of noise at source by active interventions; 2) Isolation of noise sources by passive interventions; 3) Reduction of the reverberation of noise generated in the workplace by surface treatment

  reflective using sound-absorbing materials.

  The treatment of reflective surfaces already in place with sound-absorbing materials is often difficult; it requires expensive and bulky scaffolding and

  requires very long exposure times.

  In addition, CAV and CAP vibrated concrete precast products, due to the intrinsic properties of the material,

  have very high reflection coefficients.

  The present invention aims to overcome the drawbacks of the conventional technique by proposing a method for manufacturing precast products in vibrated concrete CAV and CAP, making it possible to provide a finished product in

  which the sound absorbing material is already incorporated.

  The goal described above is achieved by the process

  whose claims are set out in the appendix.

  The structural and functional characteristics of the invention and its advantages over the technique

  classic appear from the examination of the description which follows,

  accompanied by attached schematic drawings which show examples of precast concrete products incorporating a sound absorbing material produced in accordance with the process of the invention. In the drawings: - Figures 1, 2 and 3 show a system for pouring roof tiles; and - Figures 4 and 5 show a casting system of

curtain wall panels.

  The process of the invention is extremely simple. It consists of pouring concrete (10) onto a structure made of sound-absorbing material (11) installed at the bottom of a formwork (12) in which the product is formed. It can be different types of products: a roof tile (Figures 1, 2 and 3), a curtain wall panel (Figures 4 and), etc. The types of sound-absorbing structure (11) may be different depending on the materials used, the objectives sought, the conditions of implementation provided and, in particular, the spectral characteristics of the noise in front

be absorbed.

  The figures illustrate some of the many combinations which can be envisaged, where the sound-absorbing structure (11) is an integral part of the product in

concrete (10) ready to be laid.

  Figures 1 and 2 of the drawings show a partial view of a roof tile (13) cast in a formwork (12), at the bottom of which is provided a structure made of sound-absorbing material (11) whose thickness depends on the

  noise spectrum to be absorbed.

  The soundproofing material (11) can advantageously consist of glass wool or rock wool or by any other material with similar acoustic characteristics, with orientable fibers allowing a solid anchoring of the elements by means of concrete which is fixed at the ends.

  fibers by holding them firmly.

  The apparent surface is that of unprotected wool, a finish which may be suitable for roofing tiles. FIG. 3 of the drawings shows a variant according to which a roof tile (14) is poured on a sound-absorbing structure (11) made up of a panel of glass wool or rock or any other material with similar acoustic characteristics, of density and of thickness adapted to the objective, and which rests on an electro-welded mesh (15) by means of a fabric

  mineral, natural or synthetic, suitable (16).

  The mesh (15) can be anchored to the concrete,

  for example, by wire hooks bent into a U (17).

  FIG. 4 of the drawings shows a concrete panel (18) poured directly onto a soundproofing panel (11) made of glass wool or rock wool or of a material having similar soundproofing characteristics and of thickness and density adapted to the objective sought, and which is based on a perforated sheet (19) anchored to the concrete by discs of thin metal sheet (20) made integral with the concrete

  wire element means (21).

  Figure 5 of the drawings shows a panel (22) in which the sound-absorbing material (11) is connected directly to the concrete by the only metal plate anchoring discs

  fine (20) and by the wire elements (21).

Claims (3)

  1. Method for manufacturing sound-absorbing precast concrete products, characterized in that it consists in pouring concrete (10) onto a structure made of sound-absorbing material (11) already installed at the bottom of a formwork (12) in which the product is formed.   2. Product produced according to the method of claim 1. 3. Product produced according to the method of claim 1, characterized in that the product has sound-absorbing properties depending on the type of sound-absorbing material adopted, its thickness and its relative coefficient of thermal transmission.