Theoretical Study on Design of Composite Lining Structure with Rigid–Flexible Combination for Trenchless Pipeline Rehabilitation

Trenchless rehabilitation lining can be divided into flexible solid wall structures, rigid structures and rigid–flexible composite structures. This paper reviews the research status of design theory trenchless pipes, analyzes points out that value factor determined from non-grouting angle K1 is not clear in formula structure mentioned ASTM ‘Standard Practice for Installation Machine Spiral Wound Poly (Vinyl Chloride) (PVC) Liner Pipe Rehabilitation Existing Sewers Conduits (ASTM F 1741)’. The was obtained by numerical analysis method with MATLAB software. Through variation trend value, it concluded standard only applicable to case incomplete grouting filling between original pipe pipe, complete filling. Finally, explicit fitting, which more convenient use.