Construction Technique of Using PCCP as the Mold of Tunnel Lining in South-to-North Water Transfer Project

Pre-stressed Concrete Cylinder Pipe(PCCP) fixed in the tunnel have been used in Shanxi Yellow River Diversion project.In this project,the diameter and the weight of PCCP increased Construction deadline has to be advanced.PCCP has to be used as the mold of tunnel lining concrete.PCCP construction has to be combined with lining concrete.These are difficulties for tunnel construction and machine for carrying and fixing PCCP in tunnel.Improved methods such as appropriative machine,PCCP with reinforcing fabric outside,self compacting concrete,horizontal backfill grouting pipe are used to simplify construction process,save time and reach an overall target of the project.