Road structure – process – or apparatus – Process – In situ treatment of earth or roadway
Patent
1996-12-20
1999-10-19
Lisehora, James A.
Road structure, process, or apparatus
Process
In situ treatment of earth or roadway
404 841, 404 90, 404 95, 404117, 404120, E01C 2306
Patent
active
059676957
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a vehicle for repairing damaged road surfaces, especially of pot holes, ruts, and unevenness, by compensating (filling, coating) with a filling material such as asphalt etc., comprised of a heating and scraping unit, a depositing device for the filling material, and a dynamically acting compacting device, arranged downstream of the depositing device, for compacting the scraped material and the added filling material downstream of the depositing device to a level that is higher than the level of the neighboring undamaged road surface and with a doctor blade unit, positioned downstream of the compacting device and, in operation, reciprocating transverse to the direction of travel for removal of deposited filling material downstream of the compacting device.
A repair vehicle of this kind is described in European application 560 021.
With the known vehicle according to European application 560 021 numerous experiments have been performed which experiments showed as a result that, depending on the application, on the repaired road surface air pockets of up to 2 cm depth will result with a total volume of approximately 3 to 5% and, therefore, non-reproducible compacting results are obtained.
The term "air pockets" refers to empty space within the work surface around a solid granular component or positioned adjacent thereto in any other orientation, which results from the solid particle being rolled or dragged by the horizontally acting doctor blade unit which reciprocates in a direction transverse to the direction of travel but also moves in the direction of travel whereby the remaining empty space is not filled downstream of the doctor blade unit by known vehicles.
The test results further showed that the air pockets with increasing granular size and granular distribution within the surface to be repaired would also increase.
Such air pockets cannot always and with all applications be eliminated with subsequent compacting work, for example, with a separate compacting device, with the required quality as well as personnel-independent in a reproducible and economic manner because in a subsequent compacting step the following important conditions can not always be fulfilled; uncontrollable temperature reduction of the bituminous material to be compacted, which, in turn, makes it questionable that the desired degree of compacting will be reached, compacting step and in order to level the road surface to be repaired with the undamaged road surface in a flush manner, an exact, metered feed of material is required which must correspond to the total volume of the air pockets.
The aforementioned required conditions are not fulfillable for subsequent compacting steps and are economically not feasible.
It is an object of the invention to improve the known repair vehicle according to European application 560 021 such that with only smallest remaining air pockets a reproducible and homogenous compacting can be achieved which upon local repair of road surface damage results in a flush connection to the undamaged road surface and, in the case of new coatings of entire road surfaces, ensures a preset level and a preset layer thickness.
SUMMARY OF THE INVENTION
The aforementioned object is inventively solved in that the doctor blade unit is connected to the depositing device so as to be height adjustable in a controlled manner independent of the depositing device and the compacting device and that at the vehicle behind the doctor blade unit in its vicinity a further dynamically acting compacting device is arranged.
The vehicle for repairing a damaged road surface by filling depressions within a filling material according to the present invention is primarily characterized by the following features viewed in the direction of the vehicle: the road surface; device for compacting the filling material to a level higher than a level of an adjacent undamaged area of the road surface; downstream of the first dynamic compacting device onto the filling material for removing excess
REFERENCES:
patent: 3055280 (1962-09-01), Neville
patent: 3907450 (1975-09-01), Cutler
patent: 4260280 (1981-04-01), Hirn et al.
patent: 4534674 (1985-08-01), Cutler
patent: 4871025 (1989-10-01), Mayfield et al.
patent: 5190400 (1993-03-01), Sterner
patent: 5294210 (1994-03-01), Lemelson
patent: 5348418 (1994-09-01), Campbell
Lisehora James A.
Wacker Werke GmbH & Co. KG
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