The invention relates to a sound-damping wall for arrangement alongside a railroad or highway as described in the preamble of claim 1.
Such a sound-damping wall is known by DE-A-40 07 990. In case of this known wall the receiving as well as the protruding portion of the transverse walls are in the shape of a trapezoid.
Now the object of the invention is to obtain a more stable construction of such a wall which is composed of rectangular panels.
According to the invention this is obtained by using the features indicated in the characterizing portion of claim 1.
By executing the receiving portion and the protruding portion in the way as indicated the protruding portion is fixedly received in the C-shaped portion. Owing to this said panels can not be pulled apart. Nevertheless it is possible that the longitudinal planes of subsequent panels are making an angle with each other.
By providing the transverse walls of a panel with aligned openings through which an elongated member can be slid the panels can offer more resistance to the wind load or another load.
In this case in particular the features according to claim 2 can be applied.
It is refered to DE 80 23 207 U showing a sound-damping wall comprised of panels the transverse walls of which each are provided with protruding portions which are not shaped such that a stiff connection between subsequent panels can be obtained. The protruding portions only embrace each other partly.
For stiffening the longitudinal walls of a panel so that it can have a considerable width, one can mount at least one secondary transverse wall between the transverse walls being square to the longitudinal walls and being connected with them.
According to an embodiment, the transverse walls can form an angle between 2 and 10° to a plane square to the longitudinal walls, in such a way that they enclose a sharp angle between each other. In particular, the angle between a transverse wall and the plane square to the longitudinal walls will be approximately 5°.
In this way, it is achieved that in one position, a normal flat wall will arise in that the angular rotations of the transverse walls compensate each other. In the other position, the longitudinal walls of subsequent panels will enclose an angle. Due to this, a bent screen can be obtained.
If one standard panel would be applied, it will be necessary that both longitudinal walls are provided with a perforation. If one wishes that only one transverse wall will be provided with a perforation, two differently executed panels will have to be applied. Naturally, this will have to be taken into account on mounting.
As already remarked for obtaining a firm connection between the mutually connected panels, the subsequent transverse walls are provided with a number of aligned openings through which an elongated member being square to said transverse walls can be slid.
Preferably, the openings will be in the shape of slots being transversely to the longitudinal direction of the transverse wall and extending up to the longitudinal walls of the panel and the elongated member will be a strip. The strip will then almost lie against the inner side of the longitudinal walls.
The strips will cause the subsequent panels to lie exactly in one plane. Therefore, the tolerances in the dimensions of the engaging portions of the panels can be accomodated. At the same time the strips will serve for absorbing the transverse forces, such as exerted by the wind, acting on the panels. Due to this, overload of the connecting elements of said panels and bending of an assembly of sheets can be prevented.
By applying the strips also the upper edges of a number of mutually connected panels are aligned so that an esthetic unity is obtained. The position of such an assembly can also be adapted when the foundation of a number of such assemblies on one location would be slightly more subsided than on another location.
For securing a vertical wall to the ground, one can use posts which are anchored to the ground and which are designed such that they can be received in the cavity of a panel. The posts will generally be made of metal and are, after mounting panels thereon, invisible from the outside and protected against weather influences. Due to this, grounding of the metal parts may be unnecessary.
Apart from extending in longitudinal direction, the panels can also extend in horizontal direction such as for establishing a sound screen over a railroad or highway, in which the sound screen is curved upwards over a road. In that case, the transverse walls of the panels will have to be supported by constructional elements enclosing them. Said elements can be anchored to the ground.
According to an embodiment of the invention, the panels can be partly or completely filled with a sound-absorbing material, such as in the form of mineral wool.
When the one longitudinal wall of a panel is not provided with perforations, the sound-absorbing material can be applied on this wall.
The sound-absorbing material can also be a substrate suitable for having plants grown therein. This can improve the appearance of the screen.
It is also possible, to mount a partition wall in a panel, said partition wall being parallel to the longitudinal walls of the panel and being provided with a layer of sound-absorbing material on at least one side.
In case of application alongside a railroad or a highway, with loose ground, it may be desirable to damp the vibrations being transmitted to the environment through the ground. In order to achieve this, it is possible to mount the sound damping screen according to the invention across a certain height into the ground. Then, the downwardly facing cavities of the panels will naturally be sealed-off, so that no ground can penetrate into them. Additionally, it may be desirable to seal off the cavities at the top side to prevent ground from getting into it.
In that case, the wall can also serve as earth-retaining structure and not be intended only for absorbing vibrations. In general, then only one longitudinal wall will be provided with a perforation.
The invention is further explained by way of an embodiment, shown in the drawing, in which:
The drawing shows a panel 1 consisting of the longitudinal walls 2 and the transverse walls 3 and 4. The transverse wall 3 is provided with a C-shaped portion 5 in which a protruding portion 6 connected to said transverse wall 4 can be fittingly received. Owing to this, said elements can not be pulled apart.
The transverse walls 3 and 4 are not square to the longitudinal walls 2, but can enclose an angle α with a plane 7 being square to the longitudinal walls. Due to this, the transverse walls will enclose an angle twice as large. The angle α will preferably be about 5°, but can of course also have another value, depending on the application of the panels 1.
The longitudinal walls 2 are additionally supported in relation to each other by one or more intermediate transverse walls 8. At least one of the longitudinal walls 2 is provided with perforations 9. The dimensions of the openings concerned can be adapted to the purpose. Generally, however, one and the same perforation can be used for various purposes.
As shown in the figs. 1 and 2, a panel 1 can be slid onto a post 10 which is anchored to the ground 12 by means of a baseplate 11. A number of panels can then be mutually connected and the last panel of a series can be mounted on a post 10.
For supporting the series of panels, slots 13 have been provided in the transverse walls 3, 4 and 8, in which strips 14 can be received, which then almost contact the longitudinal walls 2. The series of panels 1 can then offer more resistance to the wind load or another load.
Within the panel, a dividing wall 16 being provided with a sound-absorbing material 17 such as mineral wool, for example, can be mounted in its cavity 15. This material will be situated at a longitudinal wall 2 provided with perforations 9. Naturally, the other longitudinal wall of a panel 1 can be provided with perforations too and then the other side of the dividing wall 16 can be provided with a sound-absorbing material. In this case, the wall will be double-acting. In order to fix the dividing wall 16 in its place, slots 18 have been provided in the transverse walls 18.
When one of the posts 10 of a wall would slightly subside, the assembly of panels 1 situated there might be raised and be supported at this level so that the upper edges of all panels again form a straight line. Here, the strips 14 mounted in the panels play an important part.
It will be obvious, that only one possible embodiment of a sound-damping wall according to the invention has been illustrated in the drawing and described above and that many changes can be made without leaving the inventive idea, as it is indicated in the enclosed claims.