Static structures (e.g. – buildings) – With synthetic resinous component – Foam
Reexamination Certificate
1997-11-21
2001-02-13
Friedman, Carl D. (Department: 3635)
Static structures (e.g., buildings)
With synthetic resinous component
Foam
C052S251000, C052S309700, C052S309120, C052S405300, C052S381000, C052S383000, C052S650200
Reexamination Certificate
active
06185890
ABSTRACT:
FIELD OF THE INVENTION
The invention concerns a structural member having two parallel welded wire mesh mats forming outer and inner mats, straight web wires which keep the wire mesh mats at a predetermined distance from each other and connected at each end to the two wire mesh mats, and an insulating body which is arranged with its top and bottom or outer and inner surfaces parallel to the wire mesh mats and at a predetermined distance therefrom. The web wires pass through the insulating body.
BACKGROUND
A building element of this kind is described in U.S. application Ser. No. 08/556,924, Ritter et al. filed Nov. 29, 1995, to which International Publication WO 94/28264 corresponds. The insulating body can have hollow spaces which, however, do not extend to the top and bottom surfaces of the insulating body. At the building site, the building element is provided on both surfaces with a layer of concrete and mortar covering the wire mesh mats. It has been found that this building element may be subject to resonance vibrations of the two concrete shells in a wide frequency range. This reduces the sound damping capability of the building element.
U.S. Patent No. 4,454,702 discloses a structural member comprising an insulating body which is provided with some through-holes each reinforced by a spacer wire. This structural member is first constructed on site from the individual components such as wire mesh mats, insulating body and spacers and finally surrounded in concrete on the wire mesh mats on both sides. In this case the through-holes are also filled with concrete walls. A disadvantage with this method of production is that the structural member is constructed only on site. The number and dimensions of the through-holes are not specified in more detail.
THE INVENTION
It is an object of the invention to avoid the drawbacks described for the known structural members and to provide a structural member which is supplied to the site already prefabricated and, in addition to good heat insulating values, exhibits good sound insulation values over the whole audible frequency range.
Briefly, the structural member according to the invention is formed with at least one straight through-hole in the insulating body extending between major surfaces thereof e.g., the top and bottom or front and rear surfaces.
In accordance with a feature of the invention, the one, or at least one through-hole extends perpendicularly to the top and bottom, or front and rear, or, with respect to the wire mats, outer and inner surfaces of the insulating body. According to another feature of the invention the one or at least one through-hole can extend at a predetermined angle obliquely to the top and bottom surfaces of the insulating body, wherein the through-hole extends, when the structural member is used as a vertical wall element, obliquely downwards. Preferably in this case each oblique through-hole extends parallel to the longitudinal wires and/or parallel to the cross wires of the wire mesh mats.
According to another feature of the invention each through-hole has a round cross-section with a diameter within the range from 50 to 100 mm; this obtains the desired effect, without degrading sound and heat insulation, and structural strength.
The invention also includes a method for sheathing a structural member of the kind indicated above. With this method the procedure is such that a concrete outer or front shell which adjoins the insulating body or the separating layer adjacent to the outer wire mesh mat is applied to the outer wire mesh mat. The outer mat is designed to form the outside of the structural member. The outer wire mesh mat is surrounded by concrete, and together with the latter form a load-bearing part of the structural member; a concrete inner or rear shell which adjoins the insulating body or the separating layer adjacent to the inner wire mesh mat is applied to the inner mesh mat, which is designed to form the inside of the structural member, which surrounds the inner wire mesh mat and together with the latter forms a load-bearing part of the structural member. At the same time, each through-hole is filled with a concrete web which connects the concrete outer shell and the concrete inner shell in force-interlocking, interengaging relationship, so that, when the concrete sets, cures and hardens, a unitary concrete reinforced concrete structure, with an insulating core, will be obtained.
With the invention, the structural member can be prefabricated at the factory and exhibits optimum sound and heat insulation values with a high load-carrying capacity.
REFERENCES:
patent: 3305991 (1967-02-01), Weismann
patent: 3879908 (1975-04-01), Weismann
patent: 4079560 (1978-03-01), Weismann
patent: 4104842 (1978-08-01), Rockstead
patent: 4297820 (1981-11-01), Artzer
patent: 4454702 (1984-06-01), Bonilla-Lugo et al.
patent: 4505019 (1985-03-01), Deinzer
patent: 4541164 (1985-09-01), Monzon Indave
patent: 4702053 (1987-10-01), Hibbard
patent: WO 94/28264 (1994-12-01), None
EVG Entwicklungs -u. Verwertungs-Gesellschaft m.b.H.
Friedman Carl D.
Frishauf, Holtz Goodman, Langer & Chick, P.C.
Horton Yvonne M.
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