Discussion on Directly Buried Design of Large-diameter Hot-water Heating Pipeline

The stress analysis theory of directly buried hot-water heating pipeline is introduced.The main problems existing in directly buried design of large-diameter hot-water heating pipeline are analyzed in aspects of yield temperature difference of pipe,friction per unit length,strength of anchoring section of straight pipe,elliptical deformation of steel pipe,stress of horizontal corner section,fatigue fracture,local bending,design calculation of shear strength of polyurethane foam insulation layer and so on.