Road structure – process – or apparatus – Process
Patent
1988-06-20
1990-07-17
Novosad, Stephen J.
Road structure, process, or apparatus
Process
404 82, E01C 306, E01C 728, E01C 1124
Patent
active
049417703
DESCRIPTION:
BRIEF SUMMARY
The invention is directed to a method for applying an inductive conductor layer enclosed by a protective covering on a road surface.
On the other hand, the invention is directed to an arrangement of a heating layer on a road surface according to this method according to the characteristic features in the preamble of claim 3.
In order to determine the density of traffic, for distinguishing between types of vehicles, for example, passenger cars and trucks, for measuring speed, directing, influencing and warning traffic, for controlling signal systems and for short-term counts, it is known to embed copper wires as induction loops in grooves which are particularly cut into the road surface. The copper wires are inserted at the beginning or in the middle of the loop field according to the number of windings. The copper wires generally consist of a fine-strand wire with a cross section of approximately 1.5 mm.sup.2. They are provided with a silicon sheathing and are additionally protected by means of a glass fiber sheathing. The copper wires inserted in the grooves are then covered with a silica sand layer and usually secured against floating by means of wood wedges. The grooves are subsequently grouted with hot asphalt or plastics material.
In order to lower the expenditure of time for laying an inductive loop of copper wires and the costs involved, it is also known to lay copper layers on the road surfaces and to seal them with plastics material.
In such measures, the road surface is first covered with a template and then sprayed with a coupling agent in a thickness of approximately 0.1 mm. Next, a copper wire is liquified by means of metal spraying equipment and applied to the coupling agent in a layer thickness of approximately 0.3 mm. After removing the template, a protective covering of plastics material is applied and then dried.
Although only approximately 1/3 of the time required for the production of an induction loop of copper wires is required for this way of producing the inductive conductor layer, and the cost of production amounts to only approximately 30% of the cost of an induction loop, it has been shown that there is room for improvement in that road joints which are usually filled with an elastic substance cannot be bridged easily. Rather, special measures must be taken which involve additional expenditure. For example, it is necessary to use short cables as bridges which are soldered with the conductor layers on both sides of the road joint. However, such cable bridges must be embedded in cut out portions of the road and then covered. Moreover, the soldering of the cable bridges to the conductor layers require trained workers working with great care. Nevertheless, a loosening of the coupling agent previously applied to the road surface during the soldering process cannot always be avoided. But even when this work is carried out with care, the disadvantage remains that the coupling agent is soluble in water. A processing in subfreezing temperatures is therefore ruled out.
The invention has the object of providing a method ,and an arrangement which, on the one hand, enable the application of an inductive conductor layer on a road surface regardless of the prevailing temperatures, specifically also in the area of the road joints, and which, on the other hand, increase the range of application of the conductor layer while reducing production costs.
In the method according to the invention, this object is met in that after the road surface is cleaned an electrically conductive material is liquified by means of a metal spraying device and applied directly to the previously roughened road surface in a film-like manner, or is applied to a carrier layer, which is previously applied to the road surface, then roughened and which consists of a fast-setting plastics material which is resistant to temperature, abrasion and aggressive substances and remains elastic within certain limits, and is then sealed as a conductor layer with a protective covering consisting of a plastics material corresponding to th
REFERENCES:
patent: 2036373 (1936-04-01), Taylor
patent: 4594022 (1986-06-01), Jeppson
Novosad Stephen J.
Spahn Gay Ann
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