Corrugated spiral pipe with a coupling device and method for installing the same

A coupling structure of two corrugated spiral pipes, each of said two corrugated spiral pipes 1 comprising a pipe body 10 which has a cylindrical spirally corrugated shape 11,

• a pair of flanges 20 which are formed in one body on outer circumferences of both end portions of said pipe body 10, each of the flanges 20 having a large outer diameter portion at an end portion of the flange 20 and a small outer diameter portion 21 at a longitudinally inside portion of the flange 20, and
• a pair of binding bands 30, each of said binding bands 30 being installed on the small outer diameter portion 21 of the flange 20 and being composed of a metallic belt plate 31 which has a ring configuration in which some part thereof is cut, a plurality of connecting rings 32 which are installed axially on an outer surface of the metallic belt plate 31 at specific intervals, and bearing plates 33 which are formed vertically to both end portions of the cut part of the metallic belt plate 31, each of the bearing plates 33 having a hole,
• wherein the adjacent flanges 20 of said two corrugated spiral pipes 1 are faced each other, and
• the connecting flanges 32 of said adjacent binding bands 30 of said two corrugated spiral pipes 1 are aligned, and bolts are inserted through the connecting rings 32 and nuts are used to tighten up.