US 7,398,797 B2 · Pipe lining method

Abstract

There is provided a pipe lining method wherein a lateral pipe lining material and a main pipe lining material are securely joined. After a lateral pipe has been lined, a start liner is applied to the main pipe and a main pipe lining material is then inserted. A heating wire for melting the start liner is mounted on a surface of a flange of the lateral pipe lining material during or after lining of the lateral pipe. While the main pipe is being lined, the heating wire is heated to melt the start liner existing between the flange of the lateral pipe lining material and the main pipe lining material. When the resin in the main pipe lining material is cured, the main pipe lining material and flange of the lateral pipe lining material are integrated. This allows the lateral pipe lining material and main pipe lining material to be reliably joined.

Claims14

Dependent claims

A pipe lining method in which a lateral pipe that intersects with a main pipe is lined before lining of the main pipe, comprising the steps of:

lining the lateral pipe using a lateral pipe lining material having a flange at one end, which is brought into contact with the peripheral edge of a lateral pipe opening of the main pipe;
mounting melting means to the flange of the lateral pipe lining material during or after lining of the lateral pipe;
inserting a tubular start liner into the main pipe past the lateral pipe opening;
inserting a tubular main pipe lining material impregnated with a curable resin into the start liner past the lateral pipe opening;
applying a fluid pressure inside the main pipe to bring the main pipe lining material and the start liner into contact with an inner peripheral wall of the main pipe and the flange of the lateral pipe lining material;
curing the resin in the main pipe lining material to line the main pipe;
and
activating, during lining of the main pipe, the melting means to melt the start liner, thereby integrating the main pipe lining material and the flange of the lateral pipe lining material.

5 more elements

Dependencies are inferred from the claim text.

Pipe lining method

Life of this patent

Pipe lining method

Life of this patent

Abstract

Claims14