MANUFACTURE OF SEAL RUBBER FOR SEWAGE AND PIPE WITH SPIRAL GUIDEWAY

摘要

PROBLEM TO BE SOLVED: To provide a manufacturing method of seal rubber for sewage suitable for eliminating leakage of sewage on a joint in case of forming a pipe with a spiral guideway of a short pipe with a spiral guideway and the pipe with the spiral guideway easy to manufacture and eliminating a step difference of joints in the spiral guideway. SOLUTION: This seal rubber 1 for drainage is used between a lower end of a spiral guideway 2 of a short pipe 3 with the upper side spiral guideway 2 and an upper end of the spiral guideway 2 of the short pipe 3 with the lower side spiral guideway 2 in case of forming a pipe with the spiral guideway 2 of the short pipe 3 with the spiral guideway 2 integrally forming a part of the spiral guideway 2 on an inner surface of the short pipe, and it is furnished with a surface making contact with a lower end part lower surface and a lower end surface of the upper side spiral guideway and an upper end part upper surface and an upper end surface of the lower side spiral guideway and inclination reaching an upper surface of the lower side spiral guideway from an upper end part of the upper side spiral guideway.