排水管道在长期的使用过程中,会受到各种不同的损坏,以致不能完成原要求的排水任务。经长期使用的排水管道接口,会产生不同程度的错位,管内污(废)水从此渗漏出管外,污染四周的地下水。当排水管道四周的地下水位较高,地下水会沿着错位接口的缝隙,挟带着泥砂,进入下水管中,轻者破坏排水管中的水力条件,重者会堵塞排水管道。如地下水渗入排水管中数量过大,还会增大污水处理厂的原水量,破坏污水处理厂的正常运行。为了确保其正常运行,必须对损坏严重的排水管道进行更新。以往排水管道的更新均是更用新的下水管道,这种更新方法不仅 In the long-term use of the drainage pipe, various types of damage will be caused, so that the original required drainage task cannot be completed. After a long-term use of the drainage pipe interface, there will be different degrees of misalignment, from which the contaminated (waste) water in the pipe leaks out of the pipe and contaminates the surrounding groundwater. When the groundwater level around the drainage pipe is high, the groundwater will enter the sewage pipe along the gap of the dislocation interface, and the muddy water will enter the sewage pipe. Lightly destroy the hydraulic conditions in the drainage pipe, and the heavy water will block the drainage pipe. If the amount of groundwater seeping into the drainpipe is too large, it will increase the amount of raw water in the sewage treatment plant and damage the normal operation of the sewage treatment plant. In order to ensure its normal operation, it is necessary to update the severely damaged drainage pipes. In the past, the sewers were updated with new sewers. This update method is not only