Road structure – process – or apparatus – Pavement – Including joint means
Patent
1989-07-21
1990-11-06
Neuder, William P.
Road structure, process, or apparatus
Pavement
Including joint means
52396, E01C 1102
Patent
active
049681788
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a device for bridging expansion joints in road ways, with an extruded matting, made of elastomer, which bridges the joint, of the type wherein each longitudinal edge of the matting, parallel to the roadway is held in a groove formed in a retainer profile along the edge, the groove being open at the top, and wherein ribs formed in the matting fit precisely into the groove and essentially fill it completely, leaving only an anchoring space.
A device of this type is known from European Patent Application 86 277 B1. The known device has a matting with an extrudable cross-sectional shape. Each of its ribs, which project downward, fits into a groove in a retainer profile, which groove is open at the top. The retainer profile is anchored in the concrete substructure of the roadway. The matting completely covers the retainer profile, and by means of the side edges connects flush with the surface of the roadway. However, this connection is exposed to the direct drumming of the traffic rolling over it, which can lead to early fatigue of the elastomer of the matting and consequently to a tearing of the matting out of the anchoring. In addition, by virtue of their function, the ribs, which engage behind a sideways projection of the retainer profile, do not fill the grooves completely; this facilitates a deformation of the matting edge under the wheel load, the result being, once again, an early fatigue of the elastomer material.
SUMMARY OF THE INVENTION
It is an object of this invention to provide a structure of the edge connection for the elastomer matting, in a standard device, in such manner that cavities and local elongations in the connection area can be avoided, and so that despite simple manufacturing, a functionally secure and permanent connection between the matting edge and the roadway edge is guaranteed.
This and other objects of the present invention are attained by a device for bridging expansion joints in roadways, wherein the anchoring space enclosed between the ribs of the matting and the retainer profile is connected with the top surface of the matting through holes or slots forming casting channels in the matting, and the ribs are connected with the retainer profile by means of an elastomer synthetic resin casting substance that fills the casting channels and the anchoring space.
According to the invention, the retainer profile forms a closed anchoring space inside which the matting edge is held permanently and without bracing. The casting substance forms a firm, unbreakable connection between the matting edge and the retainer profile. It can be cast in the shop or right at the site.
Since the anchoring area is chambered by the retainer profile in known manner, a particularly durable connection is created, which is particularly resistant to the drumming exercised by the wheel loads.
Polyurethane is appropriate for the casting material; its hardness should be similar to that of the elastomer matting. During the casting, care should be taken that no cavities are left in the anchoring area; that is, the anchoring space existing between the retainer profile and the matting prior to the casting must be completely filled with elastomer casting resin.
In a preferred embodiment, the slots are formed by partitions between separated matting segments, that is, between central sections or a central section and an edge section of the matting. When the edge section is centrally symmetrical, it is possible to work with two extrusion forms, one for the central section and one for the two edge sections.
The central section of the matting, regardless of whether it is or is not connected with the edge sections, can have a cross-section of any shape, that is, the edge connection proposed in the invention is not limited to a combination with a specific type of matting.
In one-piece matting in particular, one useful embodiment provides for an insulating strip on the edge section.
In a preferred embodiment, the retainer profile is constructed as a C-profile,
REFERENCES:
patent: 3992121 (1976-11-01), Geiger
patent: 4288173 (1981-09-01), Nick
patent: 4423979 (1984-01-01), Brown
patent: 4781489 (1988-11-01), Buckenauer
Huber Reinhold
Koster Waldemar
Kober AG
Neuder William P.
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