PURPOSE: To prevent the cracking on the road surface by feeding hot water or a heat-exchanged antifreezing liquid into a radiating pipe when the temperature of the road floor buried with the radiating pipe becomes the freezing point or below, and storing heat in the road floor with the hot water or antifreezing liquid in the radiating pipe to prevent the freezing of the road floor against the cooling action of the road surface by the outside air.
CONSTITUTION: The road surface is formed with a paving material such as asphalt or concrete, a roadbed 2 made of granular material below it is provided in contact with the road floor 3 below, and a heating pipe 4 and a road floor temperature detector 6 connected to an automatic action panel 5 are installed on the boundary face between the roadbed 2 and the road floor 3 or in the road floor 3. When the road surface removed with snow by a machine is cooled by the outside air in winter and the road floor 3 is cooled to 0°C or below, the temperature of the road floor 3 is detected by the detector 6. The automatic action panel 5 is operated, the pump of the heat source is operated, the road floor 3 is warmed by the stored heat, and the freezing of the road floor 3 is prevented. The cracking on the road surface due to freezing can be prevented.
KOMATSU YOSHIETSU
GOTO NOBUAKI
