Polyurea elastomer waterproof sealing structure used for benthal single-layer heat-insulation pipe

The invention discloses a polyurea elastomer waterproof sealing structure used for a benthal single-layer heat-insulation pipe, which comprises a steel pipe and a single-layer heat-insulation pipe comprising an FBE anti-corrosion layer, a polyurethane heat-insulation layer and a high-density polyethylene jacket pipe which are sequentially arranged at the periphery of the steel pipe from the inside to the outside, wherein the position of the pipe end of the single-layer heat-insulation pipe passes through the section of the polyurethane heat-insulation layer from the peripheral face of the high-density polyethylene jacket pipe to the peripheral face of the FBE anti-corrosion layer, and is provided with a continuous jointless polyurea elastomer waterproof sealing coating. The arrangement method of the polyurea elastomer waterproof sealing coating comprises the processing of groove notching, napping, polarization and the like at the surface of the position of the pipe end of the high-density polyethylene jacket