WO1994003679A1

WO1994003679A1 - Method for production of noise shield and noise shield

Info

Publication number: WO1994003679A1
Application number: PCT/DK1993/000251
Authority: WO
Inventors: Niels Joergen Hviid
Original assignee: Grodania A/S
Priority date: 1992-08-03
Filing date: 1993-08-03
Publication date: 1994-02-17
Also published as: EP0654103A1; AU4559893A; DK0654103T3; PL307335A1; CA2141291A1; DE69315583D1; EP0654103B1

Abstract

A method for construction of a noise screen or baffle and a possibly planted noise screen or baffle (2) with a core consisting of sound absorbing material and being surrounded by a steel netting (6), said noise screen being anchored in the ground by means of vertical supports (4) being anchored with mutually distance in the ground on a row along one side of the noise screen (2), whereafter steel netting (6) is bound together to a net wall along one side of the supports (4). Thereafter said core is made by stacking up layers of blocks (10) preferably consisting of steady mineral wool (for instance GrodanTM) or similar material along the net wall, whereafter the steel netting (6) is bound together to a further net wall along the opposite side of the stacked-up core of blocks (10), before final positioning in front of said supports (4) at opposite side of the noise screen (2) vertical panels (18) made from steel or wood, which panels (18) together with the steel net walls (6) and the core material (10) are connected tight to the supports (4) by means of through-going bolts or threaded rods (20), fishplates (22) and nuts (24). If the noise screen (2) has to be planted, the core material (10) is surrounded by a web or a mat (8) with plant seeds, for instance grass seeds, or with inserted little plants, so that the web or the mat (8) is surrounded by the steel netting walls (6).

Description

METHOD FOR PRODUCTION OF NOISE SHIELD AND NOISE SHIELD

The present invention relates to a method for construction of a noise screen of the type as described in the preamble of claim 1.

In urban areas it is particularly in connection with road and industrial system often ne- cessary to etablish noise screens - and often one has forgotten during projecting to take into account space for such noise screens. Also from a financial point of view one try to avoid noise screens, which traditionally are very expensive.

For environmental reasons it is often decided to built the noise screens afterwards along roads or along neighbour boundary to a noisy company, which often implies huge traffic problems and or problems of placement, because known noise screens needs much space - both for the construction work - but also still because of the construction.

The invention has for its purpose to provide a method for construction of a noise screen of the type described in the introductory part, and by means of which a very consider¬ able relief and reduce of price of the construction work by simple provisions may be obtained, as the method according to the invention only needs very little space - during the construction work.

The method according to the invention is destinctive in that said vertical supports along one side of the noise screen are anchored in the ground on a row and with mutually di¬ stance, that the steel netting is bound together to a net wal along one side of the supports, that said core is made by stacking up layers of blocks preferably consisting of steady mineral wool (for instance GRODAN™) or similar material along the net wall, that the steel netting is bound together to a net wall along the opposite side of the core, and that vertical panels made from steel or wood are positioned in front of said support at opposite side of the noise screen, and said panels together with the steel nettings and the core material are connected tight to the supports by means of through-going bolts or threaded rods, fishplates and nuts. Hereby a noise screen is obtained, which as a conse¬ quence of its simple construction without big problems easily may be established along both new as existing roads or along neighbour boundaries to noisy companies, and which exactly in urban areas is specially advantageous, because the mounting work de- 5 mands very little place and implies a minimum of traffic problems.

Expediently the method according to the invention may be such performed that the net walls at the respective sides of the noise screen are bound together around the core material by means of bindings of steel wire, which in particular may be advantageously 0 at larger mutual distance between the vertical supports.

The method according to the invention may in situations, where a planted noise screen is wanted in a simple manner be such performed that use are made of blocks of steady mineral wool (for instance GRODAN™) with a height corresponding to the maximum 5 cappilary suction height of the material, that a cappilary breaking layer or material is placed between the respective layers of blocks, that said blocks are surrounded by a web or a matt which possible contains plant seed, for instance grass seed or inserted little plants, and that watering system is established preberably along the top of the noise screen. 0

Furthermore the invention relates to noise screen with a core made of sound absorbing material being surrounded by a steel netting, and said noise screen being anchored in the ground by means of vertical supports, which noise screen is destinctive in that said core consists of layers of blocks preferably of steady mineral wool (for instance GRO¬ ^S DAN™) or similar material, that said supports are positioned outside the core material and the steel nettings, respectively, at one side of the noise screen, and that the steel net¬ tings are bound together around the core and connected tight to said supports in such a manner, that the core and the steel nettings may form a self-supporting, compositional construction which is able to take up and to transfere horizontal forces, for instance 0 wind loads, to the supports. The noise screen according to the invention may as mentioned be adapted to be planted and furthermore be destinctive in that said core consists of blocks of steady mineral wool (for instance GRODAN™) with a hight corresponding to the maximum cappilary suction hight of the material, and that said cappilary breaking layer consists of interme- diate layer plates made from plastic foam provided with openings or cuttings being filled with drain material, for instance granulated Leca™.

Preferably the noise screen according to the invention consists of - mentioned in the order of mounting - said vertical supports preferable in the form of strong squared tubes of electroplated steel, bound together strong steel netting, a web or a matt with plant seed, for instance grass seed, or with little plants inserted, stacked up blocks of mineral wool with a capillary breaking layer or material between the respective layers of blocks of mineral wool, a web or a matt with plant seed, for instance grass seed, or with little plants inserted, bound together strong steel netting, which is bound together with first- mentioned steel netting by means of through-going bindings of steel wire, vertical holding panels of impregnated wood or electroplated steel, which at the opposite of the noise screen are tight connected to the vertical support by means of through-going bolts or threaded rods, fishplates and nuts as said web or matt preferably is stretching along first-mentioned side, along the top side and along last-mentioned side of the noise screen.

The invention is described in the following with reference to the drawing, in which:

Fig. 1 shows a sectional view through an embodiment for a noise screen according to the invention

Fig. 2 shows a sectional view for illustration how the noise screen according to Fig. 1 is constructed Fig. 3 a perspective view showing an embodiment for cappilary breaking layer between the blocks of mineral wool at the noise screens according to the invention

Fig. 4 is a partial sectional view of another embodiment for a noise screen according to the invention, and

Fig. 5 shows a side view of a noise screen according to the invention - as seen from left hand side in Fig. 1.

The noise screen 2 shown in Figs. 1 and 5 is anchored in the ground by means of vertical supports 4 consisting of strong squared tubes of electroplated steel, and which are poured solidly in digged or bored holes in the ground; and the noise screen 2 consists in order - as seen from left towards right from the supports 4 of the following parts:

Bound together strong steel netting 6 of round steel, a web or a matt 8 with plant seed, for instance grass seed, or with little plants inserted, stacked up blocks of mineral wool 10 (for instance GRODAN™) with a capillary breaking layer 12 or material 14, 16 (Fig. 4), web or matt 8, as the web or the matt 8 at first-mentioned side continues along the top side of the noise screen and down along the opposite side, bound together strong steel netting 6, which is bound together with first-mentioned steel netting by through- going bindings of steel wire (not shown), vertical holding panels 18 of impregnated wood (or possible holding panels of electroplated steel), which at the opposite side of the noise screen 2 are placed in front of the supports 4 and tight connected with these by means of through-going bolts or threaded rods 20, fishplates 22 and nuts 24.

In Fig. 2 is shown, how an end part of the web or the matt 8 - during stacking up of the blocks of mineral wool 10 - is fixed within the steel netting 6, that is between this and the blocks of mineral wool 10, while the remaining part of the web or the matt 8 is folded over and is hanging downwards at the outer side of the steel netting 6. Fig. 3 shows, that the cappilary breaking layer 12 between the individual layers o blocks of mineral wool 10 consists of a plastic sheet material 26 being provided wit longitudinal rows of through-going openings or perforations 28. The blocks of mineral wool 10 have a height of about 250 mm, namely corresponding to the maximum cappilary suction height of the mineral wool, that is that the blocks of mineral qool 1 are capable to contain so much water, that the blocks are "saturated" with water, as th cappilary breaking layer 12 ensures a suctionwise partition between the respective layers of blocks. Hereby the surplus water from the individual layer is drained to the underlay¬ ing layer of block via the perforations 28, so that the final result wili be, that all layers of blocks are saturated with water - provided of course that there via a watering system being established along the top side of the noise screen 2 (30, Fig. 1) sufficient water is supplied, whereto manure preferably is supplied.

Fig. 4 shows, that the said cappilary breaking material between the individual layers o blocks of mineral wool 10 may consist of longitudinal distance panels 14, which are placed with mutual distance along the outer sides of the blocks 10, and a water distribu¬ tion material 16 being placed between the distance panels 14, and which material 16 may consist of granulated Leca™ or possibly of net-like plastic web, that is with a structure as a "wire pad", as the water distribution material 16 shall ensure, that water "falling" downunder from a layer of block safely is lead directly to the underlying layer of block via the Leca™ or the plastic web, that is to an upper longitudinal centre zone o the underlying layer of block.

Or the cappilary breaking layer may consist of intermediate layer plates made from plastic foam, which for instance has a thickness of 20 mm, and which being provided with a large number of minor openings or a minor number of cuttings, which for instance may be filled with a drain material, for instance granulated Leca™, as opening or cuttings constitute max. 30% of the area of the intermediate layer plates. Alternately the blocks of mineral wool 10 - as shown in Fig. 4 - may be provided with an upper, longitudinal drain recess 32.

Claims

C L A I M S

1. A method for construction of a noise screen or baffle with a core consisting of sound absorbing material and being surrounded by a steel netting, said noise screen being an¬ chored in the ground by means of mainly vertical supports, c h a r a c t e r i z e d in that said vertical supports along one side of the noise screen are anchored in the ground on a row and with mutually distance, that the steel netting is bound together to a net wal along one side of the supports, that said core is made by stacking up layers of blocks preferably consisting of steady mineral wool (for instance GRODAN™) or similar material along the net wall, that the steel netting is bound together to a net wall along the opposite side of the core, and that vertical panels made from steel or wood are posi- tioned in front of said support at opposite side of the noise screen, and said panels together with the steel nettings and the core material are connected tight to the supports by means of through-going bolts or threaded rods, fishplates and nuts.

2. A method according to claim 1, c h a r a c t e r i z e d in that the net walls at the re- spective sides of the noise screen are bound together around the core material by means of bindings of steel wire.

3. A method according to claim 1 for construction of a planted noise screen, c h a r a c- t e r i z e d in that use are made of blocks of steady mineral wool (for instance GRO- DAN™) with a height corresponding to the maximum cappilary suction height of the material, that a cappilary breaking layer or material is placed between the respective layers of blocks, that said blocks are surrounded by a web or a matt which possible contains plant seed, for instance grass seed or inserted little plants, and that watering system is established preberably along the top of the noise screen.

4. A noise screen or baffle with a core consisting of sound absorbing material and being surrounded by a steel netting, said noise screen being anchored in the ground by means of vertical supports, c h a r a c t e r i z e d in that said core consists of layers of blocks preferably of steady mineral wool (for instance GRODAN™) or similar material, that said supports are positioned outside the core material and the steel nettings, respective ly, at one side of the noise screen, and that the steel nettings are bound together aroun the core and connected tight to said supports in such a manner, that the core and th steel nettings may form a self-supporting, compositional construction which is able t take up and to transfere horizontal forces, for instance wind loads, to the supports.

5. A noise screen according to claim 4 and adapted to be planted, c h a r a c t e r i z e in that said core consists of blocks of steady mineral wool (for instance GRODAN™ with a hight corresponding to the maximum cappilary suction hight of the material, an that said cappilary breaking layer consists of intermediate layer plates made from plasti foam provided with openings or cuttings being filled with drain material, for instanc granulated Leca™.

6. A noise screen according to claims 4 - 5, c h a r a c t e r i z e d in that - mentione in the order of mounting - it comprises said vertical supports preferable in the form o strong squared tubes of electroplated steel, bound together strong steel netting, a web o a matt with plant seed, for instance grass seed, or with little plants inserted, stacked u blocks of mineral wool with a capillary breaking layer or material between the respecti ve layers of blocks of mineral wool, a web or a matt with plant seed, for instance gras seed, or with little plants inserted, bound together strong steel netting, which is boun together with first-mentioned steel netting by means of through-going bindings of stee wire, vertical holding panels of impregnated wood or electroplated steel, which at th opposite of the noise screen are tight connected to the vertical support by means o through-going bolts or threaded rods, fishplates and nuts as said web or matt preferabl is stretching along first-mentioned side, along the top side and along last-mentioned sid of the noise screen.