Road structure – process – or apparatus – Process – In situ treatment of earth or roadway
Patent
1974-10-11
1976-12-14
Byers, Jr., Nile C.
Road structure, process, or apparatus
Process
In situ treatment of earth or roadway
404 95, E01C 706
Patent
active
039972763
ABSTRACT:
A road maintenance machine is provided with a heater assembly mounted on a general purpose chassis which is adapted for selectively attaching various road working devices. The heater assembly includes multiple rows of high temperature burner units each having means for burning fuel and projecting the generated heat downward against the road surface. The rows are spaced apart to allow the top of the surface to partially cool between burner rows as the heat penetrates the pavement in order to maintain the surface temperature below its flash point but high enough to achieve sufficient heat penetration to soften the pavement material to a significant depth. Heat shields and exhaust hoods are provided between the rows of burners to confine and direct the heat and combustion products. The chassis is provided with an adjustable hydraulic mechanism to which an asphalt planer, a scarifier assembly or a grooving cylinder may be attached to work the softened pavement material. An elevator is mounted at the rear of the machine to clear the roadway of planed material. An oscillating screed may be connected to the machine behind the scarifier assembly to smooth the worked surface. Methods are described for asphalt heating, asphalt planing, asphalt scarifying and asphalt grooving using the road maintenance machine.
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patent: 3801211 (1974-04-01), Perkins
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