Static structures (e.g. – buildings) – Facer held by stiffener-type frame – Back-to-back facers spaced by concealed framing
Patent
1998-02-05
1999-12-28
Friedman, Carl D.
Static structures (e.g., buildings)
Facer held by stiffener-type frame
Back-to-back facers spaced by concealed framing
5279311, 52479, E04C 234
Patent
active
060064846
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention is related to a sound-damping partition wall, especially for interior structures in buildings, comprising a sub-frame preferably designed to be a wooden frame or post construction, and two sets of planking on either broad side of the sub-frame, leaving therebetween a hollow space filled with air and/or damping material.
2. Description of the Related Art
In known partition walls of this type the planking is connected by mechanical means such as staples, nails, or screws to the wooden sub-frame. The acoustic damping values of such partition walls is not satisfactory, though, even when using thick-walled multiple planking. The sound attenuation that can be achieved therewith is in the order of 46 dB. An improvement of the damping values was in the past only possible with sub-frames in which the posts were replaced by profiled posts made of metal. The sound damping is therein improved by the internal elasticity of the profiled posts, which dampens the flexural vibrations, which are mainly responsible for the transmission of sound, when the planking is rigidly coupled to the posts. In the metal sub-frames it is found to be disadvantageous, though, that these, as opposed to the wooden sub-frames, cannot be used as load bearing walls. Therefore metal sub-frames are not liked to be used especially in the construction of pre-fabricated houses, more so since it would not fit into the production process of the building company which is usually equipped to work with wood.
Based on this it is the object of the invention to improve a partition wall of the type described above such that an increased sound-damping can be achieved with simple means.
SUMMARY OF THE INVENTION
The solution according to the invention is based on the idea that the sound decoupling between the two plankings and the sub-frame can be improved when the two plankings can vibrate independently from each other. In order to achieve this, it is proposed according to the invention that at least one set of the planking is connected to the sub-frame by means of thick, softly elastic adhesive beads. The other planking is expediently connected rigidly to the sub-frame, preferably by means of staples, nails or screws, and thereby serves as a reinforcement plane for the static calculation.
An adhesive which has a shear modulus of 0.1 to 0.3 N/mm.sup.2 at room temperature has proven to be especially advantageous. This value as well as the hardness according to the invention of 10 to 30 Shore (A) is very low compared to the adhesives usually used in wood connections and corresponds more to the values of elastic sealant materials. Due to the fact that the wall thickness of the adhesive beads corresponds to approximately 0.3 to 1.2 times their width and is about 3 to 10 mm in actual application cases, a certain amount of shear deformation within the adhesive beads has to be taken into account due to the weight of the planking.
In order to keep the shear deformation within acceptable limits, it is proposed according to a preferred embodiment of the invention that the adhesive surface areas A of the adhesive beads are dimensioned such that under the influence of the weight of the planking a shear deformation of the adhesive beads of 5 to 25% of the bead thickness results. In other words, the adhesive surface area of the adhesive beads as a function of a unit area of the planking is advantageously modulus of the adhesive and .mu. the shear deformation of the adhesive beads as a function of the bead thickness at room temperature.
For a given bead size having an adhesive surface area A' per bead the number of beads per surface unit can be determined to be
The adhesive beads have on both contact sides essentially rectangular adhesive surfaces, wherein the aspect ratio between the long and the short side is expediently chosen to lie between 4:1 and 16:1. Advantageously, the long sides of the adhesive beads are vertically aligned with respect to the sub-frame and disposed vertically spaced with respec
REFERENCES:
patent: 4069640 (1978-01-01), Dawdy
patent: 4077168 (1978-03-01), Smith
patent: 5749187 (1998-05-01), Umehara et al.
Polynorbornene--a problem solver for the 80's by Barun Dutt; European Rubber Journal Oct. 1979.
Dorsey Dennis L.
Friedman Carl D.
Sika AG
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