Permafrost Improvement

A new type of low temperature heat pipe (named "hot rod") can effectively reduce the temperature of permafrost and increase the cold storage of permafrost layer by using the unidirectional heat conduction characteristics of the heat pipe. Remarkable achievements have been obtained in the application of Qinghai-Tibet Railway permafrost subgrade reinforcement engineering, which has solved the problem of unstable settlement of permafrost in the Qinghai-Tibet railway. The utility model can be widely used for solving the problems of the settlement and deformation of the foundation, such as the railway subgrade, the highway, the bridge culvert, the tunnel, the runway, the oil pipeline, and the fixed tower, etc..