NL2013034A - SOUND SCREEN ALONG A PUBLIC ROAD OR RAILWAY. - Google Patents

Description

Sound barrier along a public road or railroad.

Known sound screens are disclosed, for example, in EP10 812 8 7A1, GB2258482, WO9812387A1, DE4416201A1 and DE8708808U1. The purpose of the noise barrier is to shield the living environment from the noise of vehicles on the road, in particular a road where people can drive faster than 80 km / h. The screen can extend several hundred meters or more parallel to the road.

Research by TNO has shown that certain noise screens have a counterproductive effect on the noise pollution of the living environment near a road. So with a sound screen the noise load for the living environment is higher than without.

The noise barrier according to the invention is characterized by the combination of simplicity of assembly, long maintenance-free lifespan, environmental friendliness, good recyclability of the parts, minimal use of materials, maximum use of wood, while amply meeting the standardized requirements of noise reduction or noise reduction, to protect the nearby living environment as much as possible from traffic noise or train noise (the effect of this noise barrier is that behind the noise barrier, the noise coming from the road (80 decibels 10 meters next to the roadway) is no louder than 54 decibels). The sound screen ensures at least a weighted sound absorption of 20 dB (A) and a weighted sound reduction of 30 dB (A). The noise from train traffic can also be effectively controlled with the noise screen.

The sound screen is made up of identical cassettes (or: modules) next to each other. A cassette preferably has one or more of: minimum 1 meter height and / or width (in the operating position), minimum 1 square meter surface area of the main surface, maximum 3 meter height and / or width, maximum 3 square meter surface area of the main surface ; rectangular. The desired height can be achieved by placing cassettes one above the other. The cassettes are secured with their side edges on upright uprights anchored in the ground. These stands can be vertical or sloping. A closed wall or wall is thus formed.

Thanks to the modular structure, prefabrication is possible under controlled conditions in a factory hall, which guarantees reproducibility.

Due to the choice of the type of solid wood and the indicated dimensions and quality of the various layers of the cassette, a surprisingly good sound attenuation is achieved in a preferred embodiment with minimal weight, so minimal material use and maximum service life.

A cassette can be considered as a relatively thick plate, so has a relatively small thickness with respect to its length and width (the length and width span the main surface of the cassette), and preferably has the following structure: parallel core is formed by an airtight layer, board-like, solid wood with a length and width substantially equal to that of the cassette. This core layer is covered on one or both sides with a coherent covering layer, similar to sound-absorbing properties, of pressed fibers, for example mineral wool or rock wool, preferably coated with a finishing cloth, for example geotextile or a fabric or mat or felt from (e.g., mineral) fibers, e.g., glass fibers. The outer layer, which is formed by identical solid wooden slats, extends parallel to each other with (preferably identical) space and extends substantially over the entire height of the cassette. The outer layer is thus air-permeable and the outer layer or, if present, the finishing cloth is visible through the outer layer. All the aforementioned layers extend parallel to the main surface of the cassette and these layers are stacked in the direction of the thickness of the cassette.

Preferably, the core layer and the cover layers are close fitting, encased in a solid wood, preferably rectangular, frame which forms the boundary of the cassette in length and width. The core layer optionally protrudes beyond the cover layers on two, preferably all four, opposite sides of the cassette so that the cassette has a lip centrally positioned in the thickness, extending over substantially the entire edge, along those edges, which preferably is meticulously received in an edge recess or groove of the frame. The accuracy guarantees the necessary air tightness and / or offers the possibility of simple fabrication.

The outer layer and / or the finishing cloth preferably overlap with the side of the frame parallel to the main surface and is preferably mounted thereto. Of the outer layer, all slats are preferably fixed to the frame only with the ends and are free between the ends. Of the finishing cloth, only the edge regions, preferably all four edge regions, are preferably fixed to the cassette and are free between them. The outer layer and / or the finishing cloth are preferably fixed to the frame by mechanical fastening means and more preferably the finishing cloth is fixed to the frame with the same fixing means. The finishing cloth is preferably fold-free and / or fixed to the frame on bias; and / or fixed to the frame evenly along the length of the edge region. The positioning and / or method of fixing the outer layer and / or finishing cloth ensures that the structure is kept sufficiently dry and / or increases the bending stiffness of the structure for loading transversely to the main surface of the cassette (e.g. wind load). The pleat-free and / or prestressed finishing cloth contributes to the bending stiffness of the cassette for loading perpendicularly (transversely) to the main surface. Even with heavy rainfall, no rainwater can get past the crease-free and / or prestressed finishing cloth, so that the core layer and the cover layer remain dry and maintain their acoustic performance. In addition, water is thus prevented from collecting in the lower part of the cassette, so that wood rot in the lower part of the frame and mold growth of moss in the lower part of the cover layer is avoided.

The cassette is preferably of identical construction on either side of the core layer, so that the core layer forms the plane of symmetry of the cassette. The core layer can be formed from stacked boards, optionally with a spring and groove.

The solid wood of the cassette (one or more of frame, core layer, outer layer, or all parts of the cassette other than the cover layer and finishing cloth) is preferably softwood or soft wood treated with acid, e.g. acetic acid (e.g. treated according to EP2242624) or heat between 150 and 200 degrees Celsius in a low-oxygen and / or moisture-rich environment (Finnforest Ikipuu Oy, Hammaslahti, Finland, or Plato International BV, Arnhem, the Netherlands) to make this more sustainable and to make good quality carpentry or construction or construction timber . For example, wood sold under the brand names Accoya or Plato, or comparable in type, quality and sustainable treatment.

Preferably, one or more of the layers of the cassette have the following dimensions (in millimeters): core layer thickness between 30 and 55, such as about 45; coating thickness between 35 and 60, such as about 50; slats of the finish layer thickness between 25 and 40, such as approximately 32, width between 30 and 55, such as approximately 45, spacing between 30 and 55, such as approximately 45, or spacing equal to the width of the slat; finishing cloth thickness at least 0.1 or 0.5 and / or at most 3, for example about 1 or 1.5.

The frame preferably forms a C-profile with the opening pointing outwards along two opposite edges of the cassette, between the legs of which the upright can be arranged to fit snugly. This C-profile is preferably made of solid wood. The legs of this C are preferably separate parts, for example boards, which are mounted on either side to a web profile. This detailing is also favorable with a view to fixing the (possibly pre-stressed) finishing cloth on the side of the frame located in the main surface of the cassette.

The slats of the finishing layer preferably run vertically in the operating position of the cassette. Apart from the cover layer, the finishing cloth and fastening means, such as glue or nails, the cassette preferably consists entirely of solid wood. In one embodiment, the slats extend beyond the frame on one of the top or bottom sides, so that the slats of the one cassette extend a little over the frame of the cassette above or beyond. underneath, with a sound screen from cassettes stacked on top of each other.

The slats preferably have a rectangular or square cross-section, optionally with rounded or chamfered corners.

For the finishing cloth, preferably one or more of the following applies: a fabric or fleece or felt; sufficient air permeability and / or mesh size to barely or not reflect sound; quality minimum of 50 and / or maximum of 300 grams per square meter, for example 100, 150, 180 or 190; in weaving pattern and / or mesh size comparable to mosquito nets, screen cloth or fiberglass wallpaper; tensile; considerably thinner, for example at least 10 or 15 times thinner than the cover layer; a single-layered fabric; flat or straight fabric, i.e. substantially as many warp and weft threads per unit area; thickness and / or tensile strength of warp and weft threads substantially equal; made up of two separate, individual layers of preferably different strength and / or material and / or weave density, for example acoustically transparent cloth (for example technical textile fabric) combined with gauze, for example mesh of preferably metal such as stainless steel, with the gauze furthest out . The difference in weave density is preferably based on mesh size, which preferably differs by at least 10%. Technical textile fabric usually looks dense to the naked eye like the fabric of a shirt. The mesh preferably offers great resistance to cutting.

The cover layer preferably has a quality of at least 35 kilograms per cubic meter, for example between 45 and 55, optionally at most 70, 80 or 100.

Preferably, the finishing cloth, or one or more or all of the parts of the cassette, is treated, preferably impregnated, with a fire-resistant agent, which is preferably coated with a water-repellent agent, for example which contains nanoparticles, for example for rinsing out the fire-resistant agent. prevent or delay.

Example, without limitation, see the drawing:

FIG. 1 and 2 show a section;

FIG. 3 a perspective;

FIG. 4 and 5 an application;

FIG. 6 an exploded view;

FIG. 7 a front view;

FIG. 8 a section;

FIG. 9 a detail; and

FIG. 10 and 11 alternative cassettes.

FIG. 1 and 2 show a top sectional view of parts of a single, separate cassette, respectively two cassettes next to each other, supported on a common, vertical upright. Components: core layer 1, cover layer 2, slats 3 of finishing layer, frame 4, lip 6 of core layer 1, legs 5 of C-profile (separate boards), stand 7, finishing cloth 8.

FIG. 3 shows a perspective view of the cassette of FIG. 1, with the cassette in the operating position and looking against a finishing layer, i.e. looking against a main surface.

FIG. 4 shows a sound screen from two cassettes side by side, supported between three stands.

FIG. 5 shows a sound screen from two cassettes next to each other and four cassettes above each other, thus a total of eight cassettes, supported between three stands.

FIG. 4 and 5 are perspective views.

FIG. 6 shows in a perspective view the beams 4 and 11 of the frame, and the core layer 1 pulled apart. The beams 4, 11 are provided with a groove 12 into which the edge of the core layer 1 fits. The beams 4 fit between the beams 11, as Fig. 7 (seam 14) shows more clearly.

FIG. 7 shows the frame from the beams 4, 11 and the finishing cloth 8 mounted in view. Some of the slats 3 of the finishing layer are shown. The edge regions 13 of the cloth 8 overlap with the side of the beams 4, 11 parallel to the main surface. The location 9 of the screws for fixing the cloth 8, the slats 3 and the boards 5 is indicated by 9. Also shown of a variant are the slats 33 which run past the beam 11 on the underside of the cassette (the slats 33 of a cassette stacked above it are shown in dotted lines at the top of the drawing of Fig. 7). The cloth 8 is tucked tightly free on the frame mounted in the areas of overlap with the frame.

FIG. 8 shows a plan view with the parts at some distance from each other, similar to FIG. 1, now showing more clearly the position of the cloth 8.

FIG. 9 shows in the view of fig. 1 an alternative structure of the beam 4, from separate pieces 41, 42 and 43, which also provides the groove 12.

FIG. 10 and 11 show an alternative embodiment of the cassette in the view of Fig. 1. The cover layer 2, slats 3 and cloth 8 are missing on one side of the core layer 1. In Fig. 11, the groove 12 is replaced by an edge recess made in two mutually adjoining sides of the beam 4.

The drawing, the description and the claims contain numerous measures in combination. The person skilled in the art will also efficiently consider the measures individually and combine them into useful further combinations.

Claims (10)

A sound barrier in the open air along a road designed for car or train traffic without a roof, with a sound-reflecting layer (1) and a sound-absorbing layer (2) on its sound side and a sound-permeable layer on the sound side (8) ) which allows the sound from the source to pass substantially unimpeded, which layer (8) is provided in the screen free of creases and / or bias, preferably overlaps with the side of the screen frame parallel to the main surface of the screen , which screen is arranged to shield the living environment from the noise of vehicles on the road. 2. Screen as claimed in claim 1, the core parallel to the main surface is formed by an airtight layer, board-like, solid wood with a length and width substantially equal to that of the cassette, this core layer being on one or both sides covered with a cohesive cover, plate-like, sound-absorbing properties, of pressed fibers, for example mineral wool or rock wool, preferably coated with a finishing cloth, for example geotextile or a fabric or mat or felt of (for example mineral) fibers, for example glass fibers, over which the outer layer extends, which is formed by identical solid wooden slats which run parallel to each other with (preferably identical) spacing and which extend substantially over the entire height of the cassette. 3. Screen as claimed in claim 1 or 2, the core layer and the cover layers are close fitting, encased in a solid wooden, preferably rectangular, frame which forms the boundary of the cassette in length and width, optionally the core layer lights two, preferably all four opposite sides of the cassette extend beyond the cover layers so that the cassette along those edges has a lip which is positioned centrally in the thickness and which extends over substantially the entire edge, which lip is preferably closely received in an edge recess or groove of the frame. Screen as claimed in claim 1, 2 or 3, the outer layer and / or the finishing cloth overlaps with the side of the frame parallel to the main surface and is preferably mounted thereto; and / or from the outer layer, all slats are only fixed to the frame with the ends and are free between the ends. 5. Screen as claimed in any of the foregoing claims, of the finishing cloth only the edge regions, preferably all four edge regions, are fixed to the cassette and lie free between them; and / or the outer layer and the finishing cloth are fixed to the frame by the same mechanical fastening means. Screen as claimed in any of the foregoing claims, the frame forms a C-profile with the opening pointing outwards along two opposite edges of the cassette, between the legs of which the upright can be snugly fitted, this C-profile is preferably of solid wood, the legs of this C are preferably separate parts, for example boards, mounted on either side to a web profile. 7. Screen as claimed in any of the foregoing claims, the slats of the finishing layer run vertically in the operating position of the cassette; and / or apart from the cover layer, the finishing cloth and fasteners, such as glue or nails, the cassette consists entirely of solid wood. 8. Screen as claimed in any of the foregoing claims, the slats extend beyond the frame on one of the top or bottom sides, so that the slats of the one cassette extend a little over the frame of the cassette above or beyond. underneath, with a sound screen from cassettes stacked on top of each other. 9. Screen as claimed in any of the foregoing claims, the slats have a rectangular or square cross-section, optionally with rounded or chamfered corners. 10. Screen as claimed in any of the foregoing claims, the finishing cloth is made up of two separate, individual layers of preferably different strength and / or material and / or weave density, for example acoustically transparent cloth (for example technical textile fabric) combined with gauze, for example hair gauze of preferably metal such as stainless steel, with the mesh furthest out.