Static structures (e.g. – buildings) – With exposed configuration having acoustical function
Patent
1996-03-18
1998-02-03
Mai, Lanna
Static structures (e.g., buildings)
With exposed configuration having acoustical function
52566, 52275, 405284, 405286, 256 131, E04B 182
Patent
active
057131619
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a noise-protection screen, provided with a number of sound-damping elements and over the length of the noise-protection screen, spaced at a distance from each other girders for the support of the elements, as well as to a sound-damping element for a noise-protection screen.
various embodiments of noise-protection screens or noise-protection walls are known. Applicants bring a noise-protection wall on the market under the name of Dumex, of which the sound-damping elements consist of a layer of reinforced concrete provided on one or both sides with a layer of wood fibre concrete.
The objective of the invention is in the first place to provide a noise-protection screen with improved sound-damping properties.
To this end the noise-protection screen according to the invention is characterized in that the noise-protection screen comprises an air cavity delimited at one side by the sound-damping elements and at the other side by panel-like elements.
In this way a noise-protection screen is obtained having excellent sound-damping properties, especially in the low frequency range.
The air cavity preferably is at the side of the sound-damping elements in contact with the surroundings by means of air holes, preferably in the form of air gaps running longitudinally along the noise-protection screen. In this way the air cavity acts as a resonator whereby excellent sound absorption is achieved. By choosing the appropriate dimensions for the air cavity and the air holes the sound absorption effect of the air cavity can be adjusted to the desired frequency range. The sound absorbing properties of the noise-protection screen according to the invention are thus obtained by the sound-damping elements and the air cavity acting as resonator.
Another objective of the invention is to provide a sound-damping element which can advantageously be used in the noise-protection screen according to the invention. The sound-damping element according to the invention is characterized in that its total thickness is built up of wood fibre concrete.
In this manner a sound-damping element is obtained having a weight considerably lower than that of the conventional sound-damping elements. This greatly simplifies the handling of the elements, such as during transport and assembly. Further, the important advantage is gained that it suffices to apply less extensive foundations. Both sides of the sound-damping element according to the invention are absorbent. As the total thickness of the sound-damping element consists of absorbent material a high degree of sound absorption is achieved. Moreover, the fabrication of such a sound-damping element made from one type of material is relatively simple, keeping fabrication costs lower.
According to the invention it is therefore preferred to apply these sound-damping elements.
The invention will be further elucidated with the aid of the drawing, Showing an embodiment of the noise-protection screen with sound-damping elements according to the invention.
FIG. 1 is a vertical section of an embodiment of the noise-protection screen according to the invention.
FIG. 2 is a horizontal section of part of the noise-protection screen as in FIG. 1.
FIG. 3 shows the detail III of FIG. 2 on a larger scale.
In FIGS. 1 and 2 a noise-protection screen 1 is shown in vertical and horizontal section respectively. The noise-protection screen 1 is provided with sound-damping elements 2, their whole thickness being built up of wood fibre concrete. By using suitable wood fibre a sound-damping element of the required strength is obtained and it is possible to fabricate eiements that can span up to about 3 m. The sound-damping elements 2 of the embodiment shown in the drawing have a length of 2 m and a hight of 60 cm. Naturally other dimensions are also possible.
The sound-damping element is comprised of a basic part 3 onto which profile ribs 4 are mounted. The thickness of the basic part 3 is 15 cm, the thickness of the profile ribs 4 is 5 cm. Again, other dimensions and also other profile forms are possi
REFERENCES:
patent: 3550332 (1970-12-01), Wiesman
patent: 3738447 (1973-06-01), Rose
patent: 3878032 (1975-04-01), Larsson
patent: 3948009 (1976-04-01), Bernhard
patent: 4226299 (1980-10-01), Hansen
patent: 4317503 (1982-03-01), Soderquist et al.
patent: 4751893 (1988-06-01), Brantley
patent: 4785577 (1988-11-01), Lederbauer
patent: 4923339 (1990-05-01), Smith
Durisol Materials Limited
Hofbauer Patrick J.
Mai Lanna
LandOfFree
Noise-protection screen does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Noise-protection screen, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Noise-protection screen will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-653627