SPR Method : Rehabilitation Technologies to Revive Decrepit Pipelines

In the SPR (Sewage Pipe Renewal) method, a rigid PVC liner is formed inside an existing pipe by using a specially designed winding machine that is placed inside the existing pipe. A rigid PVC profile strip is fed through a manhole entrance above ground, and the winding machine is used to wind and interlock the profiles together to form a liner. Rehabilitation technologies are needed that can cope with various existing installation site conditions; i.e. long or curved pipelines, with round, square or horseshoe shaped crossections. Under such circumstances, we have developed a new technology to form the PVC liner in which self running winding machenes travel around a frame that is set inside the existing pipeline, and which is made to conform to the interior cross sectional shape of the pipe.