METHOD OF PERMANENT CONNECTION OF PIPES Russian patent published in 2003 - IPC

FIELD: construction engineering; repair and erection of glass-reinforced plastic pipe lines. SUBSTANCE: proposed method includes fitting thermally shrinkable sleeve on ends of pipes to be connected , applying adhesive on surfaces to be connected, heating contact surfaces to sleeve thermal shrinkage temperature and keeping the joint at this temperature till complete thermal shrinkage and hardening of sleeve. Centering bush is mounted at negative allowance inside pipes at joint area; rigidity of centering bush in axial direction exceeds its rigidity in tangential direction by 2.5-3 times. Centering bush is made by winding pseudo-tape made in form of glass-reinforced fiber braid; angle between braid and generatrix of bush ranges from 5 to 10 deg. EFFECT: enhanced reliability of pipe line. 3 cl