CORRUGATED STEEL PIPE HAVED DUAL TYPE

摘要

Provided is a corrugated steel pipe with a double structure, and more particularly, to a corrugated steel pipe with a double structure, which can dispose a smooth- walled plastic pipe in a corrugated steel pipe more conveniently, thereby providing a simple construction and conveniently assembling corrugated steel pipes while simultaneously improving a coupling force and a sealing force.