Sound Damping Curtain Wall

The present invention relates to a sound damping curtain wall comprising a plurality of tubular parallel damping elements arranged side by side.

Such curtain walls are known for very special applications in acoustical damping for buildings, and are extremely heavy and unmanageable.

There is therefore a need for a more universally usable curtain wall, which is specially suited to placing along roads carrying heavy traffic going through densely built-up areas, but is also usable in other connections, e.g., large localities, and which can not only be arranged in a vertical position, but also in a sloping or even a horizontal position to obtain the best effect in different applications.

Such a curtain wall, has according to the invention, been obtained by the damping elements being formed with flexible walls and that the elements are joined together, preferably resiliently pressed against each other, by the use of attaching means extending along both the end portions of the elements, to which the end portions of the elements are connected. In principle, a curtain wall of this kind has double walls, between which a large volume of air is enclosed, which as is known creates good sound insulating properties. The curtain wall is furthermore easy to manufacture. Since the tubular damping elements have flexible walls, the appearance of cracks passing sound through thus being prevented in a simple manner.

The greatest and most important field of use for the curtain wall according to the invention is within traffic planning to protect housing areas from traffic noise from roads having heavy traffic. For this purpose the curtain wall according to the invention is suitably made so that the attaching means each comprises a beam arranged in recesses corresponding to the cross section of the beam, at the ends of the elements, said beams being rigidly connected to vertical posts set in a foundation. According to a preferred embodiment of the invention the tubular walls of the damping elements are longitudinally corrugated, so that the walls of the elements abutting each other will be in engagement with each other, whereby the damping elements are effectively prevented from movement between themselves. An especially attractive embodiment consists of the posts each being arranged inside a tubular damping element.

The invention will now be described more closely in the following while referring to the attached drawing, on which

FIG. 1 diagrammatically and in perspective shows a curtain wall according to one embodiment of the invention set up along a road,

FIG. 2 is a plan view of a part of the curtain wall shown in FIG. 1,

FIG. 3 is a section along line III--III in FIG. 1 and,

FIG. 4 is a plan view of the terminating damping element in a curtain wall.

The curtain wall 1 shown on the drawing consists of a number of plastic coated steel sheet tubes 2, fastened between a lower beam 3 and an upper beam 4 which are fitted into recesses 5, 6 in the lower and upper ends respectively of tube 2. The beams 3 and 4 are attached by welding or by screws (not shown) into posts 7 which are cast into foundations 8 in the ground at equidistant intervals. The posts 7 are each situated within a tube 2 and are thus not visible from the outside.

Tubes 2 can for example be cylindrical as is shown for the sake of simplicity in FIG. 1, but are preferably longitudinally corrugated so that they thus have the cross section shown in FIG. 2 for example. As stated above, tubes 2 are resiliently attached between the outmost situated tubes of the curtain wall. To take up the compressive forces on the outmost situated tubes 2, these are, as is shown in FIG. 4, suitably provided with suitably fitted distance pieces 9, which are welded onto or otherwise attached between post 7 and tube 2, for providing the necessary compressive force. Such distance pieces can also be put in at intermediate posts where required.

The invention is naturally not limited to the embodiment shown on the drawing and described above, but can be modified in many ways within the scope of the invention defined by the claims. An exterior post construction can thus be alternatively used, as well as a cross section for the tubes 2 other than the one shown on the drawing. Instead of plastic coated steel sheet for tubes 2, plastic tubes or tubes from surface finished aluminium can be used for example.