Patent ID: 8646489

Claim:
A drainage pipe connection structure for connecting a first corrugated synthetic resin pipe having an insert end at a connecting side end thereof to a second corrugated synthetic resin pipe having a a socket at a connecting side end thereof, comprising: the first and second corrugated resin pipes consisting of a pipe body with steel reinforcing projections spirally formed onto the outer surface thereof; wherein the insert end having a flat outer periphery by filling a synthetic resin into recesses between the reinforcing projections; the socket having a pipe material consisting of a short corrugated synthetic resin pipe which has a larger diameter than the second corrugated synthetic resin pipe, the pipe material is arranged in a concentric pattern to the second corrugated synthetic resin pipe and connected to the second corrugated synthetic resin pipe integrally by filling a gap between the pipe material and the second corrugated synthetic resin pipe with a synthetic resin, a tip side of the pipe material is elongated in a pipe axis direction over the tip of the second corrugated synthetic resin pipe and composed so as to engage with the flat outer periphery of the insert end.