MENDING METHOD FOR WATER PIPE

• Main Author: KIM, KI A
• Format: Patent
• Language: English
• Published: 07.07.2008
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; BLASTING; CESSPOOLS; ENGINEERING ELEMENTS AND UNITS; FIXED CONSTRUCTIONS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; JOINTS OR FITTINGS FOR PIPES; LIGHTING; MEANS FOR THERMAL INSULATION IN GENERAL; MECHANICAL ENGINEERING; PERFORMING OPERATIONS; PIPES; SEWERAGE; SEWERS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; THERMAL INSULATION IN GENERAL; TRANSPORTING; WATER SUPPLY; WEAPONS; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

A trenchless repair method of a water supply and sewage pipe is provided to attach a liner closely to a water supply and sewage pipe by applying primer on the inside of a water supply and sewage pipe and applying polyurethane or poly urea on the primer before a liner is hardened in a water supply and sewage pipe. A trenchless repair method of a water supply and sewage pipe comprises the steps of: removing rust formed on an internal wall of a water supply and sewage pipe(1); applying primer(2), which is an adhesive, on the inside of the water supply and sewage pipe; applying polyurethane or poly urea(3) on the surface of the primer to the thickness of 3~5mm; reversing and approaching a liner(4), which is a reinforcing tube with impregnated epoxy resin, to the inside of the water supply and sewage pipe using air pressure or water pressure; and injecting steam or hot water to the inside of the liner and hardening the epoxy resin impregnated to the liner, thereby making the liner adhered closely to the water supply and sewage pipe.