▎ 摘　　要

NOVELTY - The thermal insulation method involves arranging a hole wall graphene electric heating film (2) on two sides of a tunnel (7). A water conveying pipe (3) is covered on an outer wall of the tunnel. A sandstone material field spraying and mixing station outside the tunnel is provided with a greenhouse. A generator (5) is electrically connected with a transformer (4) for providing power supply. The transformer is connected with the hole wall graphene electric heating film. A thermometer (1) is connected between the hole-wall graphene heat insulation membrane, the water transfer tube graphene heat dissipation membrane, and a water transfer pipe graphene heating membrane. The hole-walled graphene heat insulating membrane is connected to the thermometer. USE - Thermal insulation method for tunnel construction in winter. ADVANTAGE - The thermal insulation method has good heat preservation effect, the temperature of the heat preservation is controllable, and easily characteristics by the external weather. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the thermal insulation method for tunnel construction in winter. 1Thermometer 2Hole wall graphene electric heating film 3Water conveying pipe 4Transformer 5Generator 6Water conveying pipe graphene electric heating film 7Tunnel