METHOD FOR LINING INSIDE SURFACE OF INSTALLED PIPE

PROBLEM TO BE SOLVED: To inexpensively and efficiently subject a branch joint part to a lining treatment with good finishing accuracy by applying a lining material on the inner peripheral surface of an installed pipe main to subject the installed pipe main to the lining treatment and mounting a lining sheet at the inner peripheral surface of the branch pipe joint part, thereby subjecting the part to the lining treatment. SOLUTION: A rubber sheet 7 for lining is inserted into the branch pipe joint part 4a from a branch attaching and detaching opening. The rubber sheet 7 is adhered to the inner peripheral surface portion of the branch joint part 4a by using the resin lining material 5 previously adhered to the rubber sheet 7 as an adhesive, by which the branch joint part is subjected to the lining treatment. A plug member 8 formed of rubber molded good is packed in an elastically deformed state into the rubber sheet 7 from the branch pipe attaching and detaching opening of the branch joint part 4a to keep the resin lining material 5 closed to prevent the intrusion of the lining material from the installed pipe main 3. Next, the resin lining material 5 is supplied into the installed pipe main 3 and a pig 6 is moved from the one end side to the other end side of the installed pipe main 3, by which the entire part of the inside of the installed pipe main 3 is subjected to the lining treatment.