The utility model is mainly composed of a corrugated pipe and a structural component, which is mainly used for absorbing the axial displacement and can not bear the pressure pushing force of the corrugated pipe. For small diameter pipeline, easy to set up the fixed support pipeline, should be given priority to use this. But it can not withstａnd the pressure thrust, so when it is used, it is necessary to correctly calculate the pressure thrust, and the correct set of fixed support. For large diameter pipelines, although the pressure is low, but the pressure thrust is large, it is necessary to set a fixed support and sliding bearings.