DOUBLE-WALLED CORRUGATED STEEL PIPE

摘要

PURPOSE: A double-walled corrugated steel pipe is provided to make a flat pipe evenly fixed on the inner face of a pipe having a corrugation and to enlarge the contacting area of the pipe body and the flat pipe. CONSTITUTION: A metal pipe body(1) has a corrugation(2). A flat pipe(3) having a smooth surface is fixed while contacting to the inner face of the pipe body. A horizontal portion(2a) is integrally formed on the corrugated end portion of the inner circumference of the pipe body. While the flat pipe contacts to the inner face of the pipe body, the pipe body contacts to the horizontal portion of the corrugation. Thus, the contacting area is enlarged.