STEEL PIPE EXTERNAL SURFACE ANTICORROSION STRUCTURE AND ITS ANTICORROSION METHOD

摘要

PROBLEM TO BE SOLVED: To provide a structure for performing anticorrosion at an external surface of buried existing cast iron pipe under an easy and superior workability.;SOLUTION: A polyethylene sheet 10 is applied to wind a part of an existing cast iron pipe P that is dug-up from earth and exposed from its lower part to upward, a central protrusion piece at one protrusion end part 12a with both cut portions being applied as an interface is applied to overlap a rear side of a central protrusion piece of the other protrusion end part 12b through said cut portions and at the same time both side protrusion pieces at the other protrusion end with both cut-portions being applied as an interface are overlapped on the rear sides of both side protrusion pieces of one protrusion end part through said cut portions and both protrusion end parts are engaged with each other and fixed. The engaged portions are positioned inside in such a way the extremity ends of the cut portions may not reach the bent lines, overlapped to be bent and set along an outer peripheral surface of the cast iron pipe and then they are fixed by a rubber band 14 and the like.;SELECTED DRAWING: Figure 1D;COPYRIGHT: (C)2018,JPO&INPIT