JOINT FOR DIFFERENT-DIAMETER PIPES AND METHOD OF CONNECTING DIFFERENT-DIAMETER PIPES

摘要

A joint which is a cylindrical body having an innercircumferential surface, a diameter of which is larger than anyof outer diameters of two pipes to be connected, thecylindrical body being provided with an annular projectingstrip portion formed in an approximately axially intermediateportion so as to project radially inward, first and secondcylindrical portions respectively disposed on opposite sides ofthe annular projecting strip, annular projecting portionsprojecting radially outward so as to form annular spaceportions in approximately intermediate portions of the firstand second cylindrical portions respectively, and through holesformed respectively in the annular projecting portions forinjecting a foamable and curable liquid agent. A method ofconnecting pipes by use of the above pipe joint, includes thesteps of bonding sealing bodies of a compressible anddeformable material onto the outer circumferential surfaces ofthe two pipes to be connected or the inner circumferentialsurfaces of the joint; pressing the pipes into the joint;injecting a foamable and curable liquid agent into inside spaceportions through corresponding through holes so as to fill theinternal space portions with a foamed and expaned hardenedsubstance of the liquid agent injected therein to therebyconnect the pipes to the joint water-tightly.