Connection structure of spiral wire tube to hand hole, pipe of spiral wire tube, length adjustment method, connection structure of conversion adapter and hand hole, conduit of square type wire tube, length adjustment method and connector

摘要

Problem to be solved: to provide a connection structure with a handhole of a spiral wire tube capable of securing a high stopping water quality and preventing the water inflatable nonwoven fabric from being damaged due to pressure during expansion.Solution: the inner connector 1a is made of resin, for example, and has a cylindrical portion 3a having a spiral shaped portion 7a and a flange portion 5a extending radially from the tube end portion of the cylindrical portion 3a at a substantially right angle to one end of the cylindrical portion 3a.The cross section of the spiral portion 7a in the direction parallel to the tube axis direction of the cylindrical portion 3a is made up of two opposed parts of the ridge 11a.A partition wall 9a, which is substantially parallel to the tube axis direction, is formed at a predetermined interval so as to block the groove 13A formed between the opposed mountain portions 11a so as to block the groove 13A. The water expansion nonwoven fabric 17a provided in the cylindrical portion 3a is formed so as to extend over the upper portion of the groove by connecting the opposing portions of the mountain portion.Diagram