A method of manufacturing a corrugated steel pipe having excellent durability performance and watertightness and a corrugated steel pipe

摘要

The present invention relates to a method of manufacturing a lock-seam joint-type corrugated steel pipe, comprising: a pre-treatment step (S10) for removing foreign substances from the prepared steel plate 10; A coating process (S20) of forming a coating layer 20 on both sides of the steel plate 10; A coating step (S30) of forming a coating layer 30 on the outer surface of the coating layer 20; A forming step (S40) of bending the steel plate 10 to form the connecting ring 40 and the corrugated portion 45; A forming step (S50) of forming the lock core portion 50 by pressing the steel plate 10 into a tubular shape and pressing the connecting rings 40 facing each other in a meshed state (S50); It characterized in that it comprises a; reinforcing step (S60) of forming a streamlined reinforcing layer 60 for sealing the joint portion of the lock core 50. Therefore, the present invention improves the adhesion of the coating layer by modifying the outer surface of the steel plate, and forms a coating layer so that the inner and outer surfaces of the steel plate are sealed to provide excellent durability and watertightness. It has the effect of minimizing the frictional resistance of the fluid while doubling it to prevent precipitation and deposition of foreign substances.