Pipe lining method

• US 20070240779A1
• Filed: 04/12/2007
• Published: 10/18/2007
• Est. Priority Date: 04/14/2006
• Status: Active Grant

• Current Assignee: Shonan Gosei-jushi Seisakusho K.K.
• Original Assignee: Shonan Gosei-jushi Seisakusho K.K.
• Inventors: Fujii, Kenji, Kamiyama, Takao, Kaneta, Koji
• Granted Patent: US 7,398,797 B2
• Time in Patent Office: Days
• US Class Current: 138/98
• CPC Class Codes: B29C 63/0086 and removing the portion of the lining covering the holes
• CPC Class Codes: B29C 63/36 being turned inside out for platic tubes in general B29C67/0018
• CPC Class Codes: F16L 55/1651 the flexible liner being everted
• CPC Class Codes: F16L 55/179 specially adapted for bends, branch units, branching pipes or the like

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.

Claims

1. 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.

2. A pipe lining method according to claim 1, wherein the melting means is a reticulated wire that is bonded to the surface of the flange that faces the axial center of the main pipe.

3. A pipe lining method according to claim 1, wherein the melting means is a solvent capable of dissolving the start liner bonded to the surface of the flange that faces the axial center of the main pipe.

4. A pipe lining method according to claim 1, wherein the start liner and main pipe lining material are mounted on an eversion nozzle and evertedly inserted into the main pipe.

5. A pipe lining method according to claim 1, wherein, after the main pipe has been lined, a drill is inserted into the lateral pipe toward the main pipe, and a hole is drilled into the start liner and main pipe lining material that close off the lateral pipe opening.

6. A pipe lining method according to claim 5, wherein the drill has a drill blade that is retracted until inserted in the lateral pipe opening and that expands toward the start liner and main pipe lining material when inserted up to the lateral pipe opening.

7. A pipe lining method according to claim 5, wherein a metallic collar for preventing contact between the drill blade and lateral pipe lining material is disposed in a portion of the lateral pipe lining material where the drill blade is deployed.

8. 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 and melting means mounted thereon, the flange of the lateral pipe lining material being brought into contact with the peripheral edge of a lateral pipe opening of the main 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.

9. A pipe lining method according to claim 8, wherein the melting means is a reticulated wire that is bonded to the surface of the flange that faces the axial center of the main pipe.

10. A pipe lining method according to claim 8, wherein the melting means is a solvent capable of dissolving the start liner bonded to the surface of the flange that faces the axial center of the main pipe.

11. A pipe lining method according to claim 8, wherein the start liner and main pipe lining material are mounted on an eversion nozzle and evertedly inserted into the main pipe.

12. A pipe lining method according to claim 8, wherein, after the main pipe has been lined, a drill is inserted into the lateral pipe toward the main pipe, and a hole is drilled into the start liner and main pipe lining material that close off the lateral pipe opening.

13. A pipe lining method according to claim 12, wherein the drill has a drill blade that is retracted until inserted in the lateral pipe opening and that expands toward the start liner and main pipe lining material when inserted up to the lateral pipe opening.

14. A pipe lining method according to claim 12, wherein a metallic collar for preventing contact between the drill blade and lateral pipe lining material is disposed in a portion of the lateral pipe lining material where the drill blade is deployed.