Patent ID: 8635753

Claim:
A lateral pipe lining method in which a flange formed on one end of a lateral pipe lining material composed of a flexible tubular resin-absorbing material impregnated with a curable resin is brought into close contact with the periphery of a lateral pipe opening of a main pipe, and eversion pressure is applied to the lateral pipe lining material to evert and insert the lateral pipe lining material into a lateral pipe to line the inner circumferential wall thereof, comprising: preparing a head collar having a curved section and a cylindrical section projecting from the curved section and having a smaller outside diameter than the inside diameter of the flange of the lateral pipe lining material; mounting to the outer circumferential surface of the cylindrical section of the head collar an expanding member capable of expanding by feeding a pressurized fluid thereto, the lateral pipe lining material being installed on the head collar so that the cylindrical section of the head collar to which the expanding member is mounted is located within the flange of the lateral pipe lining material; expanding the expanding member so that the outer circumferential surface of the expanding member comes into close contact with the inner circumferential surface near the flange and the inner circumferential surface of the expanding member comes into close contact with the outer circumferential surface of the cylindrical section of the head collar; and everting and inserting the lateral pipe lining material into the lateral pipe with the expanding member expanded to line the lateral pipe with the lateral pipe lining material.