INSULATING JOINT Russian patent published in 2000 - IPC

FIELD: construction engineering; erection of under-ground pipe lines. SUBSTANCE: threads of sleeve joint of pipes on sleeve and branch pipes is made in such way that in screwing them together, radial clearance is obtained over entire surface of joint of parts; overlapping of thread excludes break of joint when axial forces are applied. Clearance is filled with reinforced dielectric polymer material possessing high adhesion both relative to sleeve and to branch pipes ensuring electrical isolation of branch pipes and simultaneously taking up mechanical loads and sealing the joint. Increase of diameter of pipe line is equal to difference between diameters of sleeve and branch pipes. For equalizing the inner diameter of pipe line, ring made from insulating material is laid between ends of branch pipes. Threads of branch pipes and sleeve may be made by spirally welding the metal bar forming turns of thread. Fabric of different composition may be used as reinforcing material. EFFECT: simplified construction; enhanced reliability of joint. 3 cl, 1 dwg