Bucket Buckling Behavior due to External Water Pressure of a Renewal Pipe under Different Restraint Conditions

Abstract

With the aging of social infrastructure facilities, there are increasing cases of serious accidents and obstacles due to the inability to exert the functions expected at the time of initial design. In the accident case where pipes inserted into tunnels or pipelines are buckled due to external water pressure, it caused serious damages to the irrigation system. Typically, renewal pipes are inserted into the existing tunnels and pipelines to increase their structural integrity; inner-fill materials are filled inside the existing pipes to fill voids. The effects of these inner-fill materials have not been yet fully elucidated. This study aims to determine the effect of external water pressure on renewal pipe. Simulation buckling tests are conducted to determine the contribution of water pressure in causing unexpected pipeline accidents. Two types of buckling behavior, i.e., free and restrained, were observed. We tested the buckling strength of horseshoe-shaped renewal pipes.