FR2910914A1 - Bund type noise barrier fabricating method for protecting residents/road users from traffic noise, involves placing stones in cages with sand, and repeating cages and stones placement and sand filling operations until barrier is obtained - Google Patents

Abstract

The method involves placing superimposed and juxtaposed parallelepiped or trapezoidal shaped cages in metallic mesh or spaced wood baulks, where the cages are superimposed and juxtaposed. Containers e.g. honeycomb blocks or cores (9), are placed and are filled with fine sand. Stones are placed in the cages with the fine sand positioned at the middle of the stones. Placing and filling operations are repeated by superposing the containers until a noise barrier is obtained.

Description

In the context of the protection of the environment, it is increasingly

  current to protect residents from the noise of road traffic. To this end, the designers of the projects propose either the so-called thin thin acoustic screens, figure 1 or, merlon type screens (2) with a mineral aspect. These screens generally consist of parallelepipedal or trapezoidal wire mesh cages (2), Figure 2 or wooden braced planks (3), Figure 3. These cages are then filled with stones (4). Although the choice of a mineral facing satisfies road users and residents in an aesthetic way, the purpose of these screens, namely acoustic protection, is sometimes put in the background because the large volume of voids communicating between the filling stones allows the passage of noise through the screen and the screen does not properly fulfill its role of anti-transmission. To deal with this problem, the designers provide inside the screen a core of thickness 30 to 50 cm of fine sand (5) to prevent, not its mass effect, the transmission of noise, figure 4. It is then systematically proposed that this thickness of sand is wrapped in an anti-contaminating layer (6) to prevent sand from being lost by entering the voids between stones. This design gives theoretically satisfaction, except that its realization is often a source of problem, even of defect because the establishment of the anticontaminant layer is very difficult and the random filling. Some suggestions are to affix a solid, solid body instead of a layer of sand, such as bricks or concrete slabs. These variants have an acoustic disadvantage because the strength of these reported bodies is not continuous and passes the noise. Moreover their implementation is complex because they do not have the necessary self-stability during the implementation of stones, often quasi-mechanical. The present invention provides a simple solution, perfectly effective and economical. The invention retains the use of fine sand which is an economical material and quite suitable for acting as a noise-proof core and proposes a sufficiently rigid container, free-standing, easy to implement and which provides an easy way of sand filling while guaranteeing the continuity of this sand core in time. This is a product placed in the intended location of the sand core inside the screen, it is both rigid and provided with sufficient cavities so that when filled with sand, the mass that it represents offers noise antitransmission properties. Once the product is laid and filled with sand, the stones are then used on both sides of the rigid core. This product may have the general shape of a simple slice (7) or a gutter (8), made of concrete, plastic, wood or welded mesh covered with an anticontaminant ply, FIGS. 5 and 6. Another suggestion of the invention, this product is a honeycomb block (9), Figure 7, having several advantages: Its density is very low, which allows the handling and easy laying of blocks in large dimensions . o It has a very high void percentage to house the sand. o Its pseudo cylindrical cavities (10) are oriented in the direction of filling (11) facilitating this operation. o The structure of the product ensures continuity and maintenance of the sand over time. Figures 8, 9 and 10 respectively show a perspective, a vertical section and a plan view of a screen (2) provided with a honeycomb core (9) filled with fine sand, surrounded by stones (4). ) constituting the facings of the screen. The different stages of the production of the screen are shown diagrammatically in FIGS. 11 to 17. o The establishment of the cage made of wire mesh (2) or of wood braced planks (3). Figure 1 l o The placement of honeycomb blocks (9) or the container in other forms (7 or 8). Figure 12 o Sand filling of the container. Figures 13 and 14 o The placement of stones. Figure 15 o The repetition of the previous steps, by superimposing the containers (7, 8 or 9) until the completion of the screen. Figures 16 and 17.

Claims (4)

  1 Process for producing noise barriers consisting of cages, juxtaposed and superimposed, of parallelepipedal or trapezoidal overall shape, in wire mesh or in braced wooden planks, filled with stones with a core of fine sand positioned substantially in the middle of the stones, to prevent the transmission of noise through the screen by the mass effect, characterized in that said sandy materials are contained in one or more containers juxtaposed and superimposed, sufficiently rigid and freestanding and ensure ease of filling the sand while ensuring the maintenance and continuity of this core of sand over time. 2 Method according to claim 1, characterized in that said container is a honeycomb block whose pseudo cylindrical cavities are oriented in the vertical direction. 3. Process according to claim 1, characterized in that said container is a utensil in the form of a slice. 4 Process according to claim 1, characterized in that said container is a utensil in the form of gutter.