Practical application of mechanical spiral winding rehabilitation technology in repairing riverside intercepting sewage main pipes
In a riverside wetland park in Qijiang district,Chongqing,a 481 meter long main sewage interceptor experienced severe leakage that made of double-wall corrugated pipe.The me-chanical spiral winding rehabilitation technology was employed for rehabilitation.Results showed that this technology could overcome difficulties such as limited access for construction vehicles and harsh working conditions.Through calculations and products selection,the 126-20(S5)strip ma-terial,reinforced with a 0.7 mm thickness stainless steel strip,was utilized.The measured short-term stiffness coefficient was 2.07×106 MPa·mm3,meeting the design requirements.A total of 108 tons of grouting cement was successfully used to fill the gap between the liner and raw pipe-line.
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