Device and method for repairing pipe

1. An apparatus for repairing a main pipe line a lateral pipe line connected thereto and in communication therewith to form a pipe joint, the apparatus comprising:

a bladder assembly comprising a main bladder tube and a lateral bladder tube;

a liner assembly comprising a main liner member and a lateral liner tube of resin absorbent material in communication with one another through a liner juncture;

the lateral bladder tube and the lateral liner tube being adapted to extend within the lateral pipe line with the lateral bladder tube being inside the lateral liner tube and the lateral liner tube being between the lateral pipe line and the lateral bladder tube;

the main bladder tube and the main liner member being adapted to extend within the main pipe line with the main liner member being between the main pipe line and the main bladder tube; and

a gasket surrounding a portion of the lateral liner tube and the main liner member near the liner juncture, the gasket being made of a hydrophilic material that is impermeable and capable of swelling in response to being exposed to a liquid, thereby forming a seal between the liner assembly and main and lateral pipe lines at the pipe joint, wherein the gasket includes a tubular portion having a first end and a second end and a flange portion extending outwardly from one of the first and second ends of the tubular portion.

2. The apparatus of claim 1 wherein the main liner member is formed as a tube.

3. The apparatus of claim 1 wherein the flange portion of the gasket is connected to the main liner member near the liner juncture.

4. The apparatus of claim 1 further comprising a launcher device within the main bladder tube.

5. The apparatus of claim 1 wherein the gasket is attached to the main liner member.

6. The apparatus of claim 1 wherein the main liner member and the lateral liner tube are connected at the liner juncture.

7. The apparatus of claim 1 wherein the main and lateral bladder tubes are fluidly connected.

8. The apparatus of claim 1 wherein the hydrophilic material is a hydrophilic rubber.

9. A liner assembly for repairing a main pipe line and a lateral pipe line connected thereto and in communication therewith to form a pipe joint:

a main liner member and a lateral liner tube in communication with one another through a liner juncture, the lateral liner tube being adapted to extend within the lateral pipe line and the main liner member being adapted to extend within the main pipe line at the pipe joint; and

a gasket surrounding a portion of the lateral liner tube and the main liner member near the liner juncture, the gasket being made of a hydrophilic material that is impermeable and capable of swelling in response to being exposed to a liquid, thereby forming a seal between the main and lateral liners and the main and lateral pipe lines at the pipe joint.

10. The apparatus of claim 9 wherein the main liner member is formed as a tube.

11. The apparatus of claim 9 wherein the gasket includes a tubular portion having a first end and a second end and a flange portion extending outwardly from one of the first and second ends of the tubular portion.

12. The apparatus of claim 11 wherein the flange portion of the gasket is connected to the main liner member near the liner juncture.

13. The liner assembly of claim 9 wherein the gasket is attached to the main liner member.

14. The liner assembly of claim 9 , wherein the hydrophilic material is a hydrophilic rubber.

15. The liner assembly of claim 9 , wherein the hydrophilic material is a hydrophilic paste.

16. An apparatus for repairing the junction of a main pipe line and a lateral pipe line connected thereto, comprising:

a main bladder tube and a lateral bladder tube;

a main liner member and a lateral liner tube formed of a resin absorbent material, the main liner member having a main liner member opening, the lateral liner tube extending from the main liner member about the main liner tube opening;

a launcher device having first and second opposite ends and a launcher device opening there between;

the main bladder tube being outside and surrounding the launcher device and the lateral bladder tube extending through the launcher device opening and into the inside of the launcher device;

the main liner member being outside and at least partially surrounding the main bladder tube and the launcher device, the lateral liner tube extending through the launcher device opening and into the inside of both the launcher device and the lateral bladder tube;

a compressible gasket of an impermeable material having a tubular portion with opposite first and second ends and a flange portion extending outwardly away from one of the first and second ends of the tubular portion, the flange of the gasket being disposed on the outside of the main liner member;

the lateral bladder tube, lateral liner tube and tubular portion of the gasket being invertible through the launcher device opening to an inverted position outside the launcher device wherein the lateral liner tube is on the exterior of the lateral bladder tube and the gasket is on the exterior of the main liner member and the lateral liner tube.

17. The apparatus of claim 16 wherein the gasket being made of a hydrophilic material capable of swelling in response to being exposed to a liquid, thereby forming a seal about the junction between the main pipe line and the lateral pipe line.

18. The apparatus of claim 16 wherein the main bladder tube and the lateral bladder tube are connected to form a T-shaped or Y-shaped bladder.

19. The apparatus of claim 16 wherein the gasket being made of an impermeable compressible material.

20. The apparatus of claim 16 wherein the flange of the gasket is attached to the main liner member.

21. The method of claim 16 wherein the tubular portion of the gasket extends within the lateral liner tube.

22. A method for repairing a damaged junction between a main pipe line and lateral pipe line, the method comprising:

forming a main bladder tube and a lateral bladder tube;

forming a main liner member and a lateral liner tube of resin absorbent material, the main liner member having a main liner opening therein, and the lateral liner tube extending from the main liner member about the main liner opening;

taking a compressible gasket or an impermeable material having a tubular portion with opposite first and second ends and a flange portion extending outwardly away from one of the first and second-ends of the tubular portion;

positioning the gasket with the flange of the gasket being disposed on the outside of the main liner member;

impregnating the main liner member and the lateral liner tube with a. material capable of curing and hardening;

inserting the lateral liner tube at least partially inside the lateral bladder tube while at the same time keeping the main liner member at least partially outside the main bladder tube;

inserting the lateral liner tube and the lateral bladder tube at least partially into the inside of a launcher device through a launcher device opening in the launcher device while at the same time keeping the main bladder tube, the main liner member, and the flange portion of the gasket at least partially outside of the launcher device;

inserting the launcher device into the main pipe line;

registering the launcher device opening with the junction of the lateral pipe line and the main pipe line; and

inverting the lateral bladder tube and the lateral liner tube out of the launcher tube into the lateral pipe with the lateral liner tube and the tubular portion of the gasket being outside the lateral bladder tube.

23. The method of claim 22 wherein the gasket being made of a hydrophilic material capable of swelling in response to being exposed to a liquid, and the method further comprising the step of exposing the gasket to a liquid that causes the gasket to swell, thereby forming a seal between the main liner tube and the lateral liner tube and the junction of the lateral pipe line and the main pipe line.

24. The method of claim 22 wherein the gasket being made of an impermeable compressible material.

25. The method of claim 22 and further comprising the steps of pressing the main liner tube and the lateral liner tube radially outwardly against the main line pipe and the lateral pipe line, permitting the curable resin to cure and harden, and removing the launcher device, the main bladder tube and the lateral bladder tube from the main pipe line.

26. The method of claim 22 wherein at least a portion of the tubular portion of the gasket is disposed within the lateral liner tube prior to inverting the lateral liner tube.

27. An apparatus for repairing a main pipe line a lateral pipe line connected thereto and in communication therewith to form a pipe joint, the apparatus comprising:

a bladder assembly comprising a main bladder tube and a lateral bladder tube in communication with one another through a bladder tube juncture;

a liner assembly comprising a main liner member and a lateral liner tube of resin absorbent material in communication with one another through a liner juncture;

the lateral bladder tube and the lateral liner tube being adapted to extend within the lateral pipe line with the lateral bladder tube being inside the lateral liner tube and the lateral liner tube being between the lateral pipe line and the lateral bladder tube;

the main bladder tube and the main liner member being adapted to extend within the main pipe line at the pipe joint with the main liner member being between the main pipe line and the main bladder tube; and

a band of an impermeable and hydrophilic material disposed on the outside of the main liner member and surrounding the liner juncture, the hydrophilic band capable of swelling in response to being exposed to a liquid, thereby forming a seal between the liner assembly and main pipe line around the point joint.

28. The apparatus of claim 27 wherein the main liner member is formed as a tube.

29. The apparatus of claim 27 wherein the impermeable and hydrophilic material is a hydrophilic paste.

30. A method of repairing a main pipe line and a lateral pipe line connected thereto and in communication therewith to form a pipe joint; the method comprising:

taking a bladder assembly including a main bladder tube and a lateral bladder tube;

taking a liner assembly including a main liner member and a lateral liner tube in communication with one another through a liner juncture;

impregnating the liner assembly with a material capable of curing and hardening;

positioning a band of impermeable and hydrophilic material on the outside of the main liner member around the liner juncture;

moving the lateral liner tube and the lateral bladder tube within the lateral pipe line with the lateral bladder tube being within the lateral liner tube; and

exposing the hydrophilic band to a liquid that causes the band to swell, thereby forming a seal between the liner assembly and the main and lateral pipe lines at the pipe joint.

31. The method of claim 30 wherein the lateral liner tube and the lateral bladder tube are inverted into the lateral pipe line.

32. The method of claim 30 wherein the lateral liner tube and the lateral bladder tube are pulled into the lateral pipe line.

33. The method of claim 30 wherein the impermeable and hydrophilic material is a hydrophilic paste.

34. A liner assembly for repairing a main pipe line and a lateral pipe line connected thereto and in communication therewith to form a pipe joint, the liner assembly comprising:

a main liner member and a lateral liner tube in communication with one another through a liner juncture, the lateral liner tube being adapted to extend within the lateral pipe line and the main liner member being adapted to extend within the main pipe line about the pipe joint; and

a band disposed on the outside of the main liner member about the liner juncture, the hand being made of a hydrophilic and impermeable material capable of swelling in response to being exposed to a liquid, thereby forming a seal between the main liner member and the main pipe line near the pipe joint.

35. The liner assembly of claim 34 wherein the band of hydrophilic and impermeable material is ring-shaped and is disposed on the main liner member surrounding the liner juncture.

36. The liner assembly of claim 34 wherein the lateral liner tube is formed from a resin absorbent material.

37. The liner assembly of claim 34 wherein the lateral liner tube and the main liner member are formed from a resin absorbent material.

38. The liner assembly of claim 34 wherein the main liner member is a tube.

39. The liner assembly of claim 34 wherein the impermeable and hydrophilic material is a hydrophilic paste.

40. A method of repairing a main pipe line and a lateral pipe line connected thereto and in communication therewith to form a pipe joint; the method comprising:

taking a liner assembly including a main liner member and a lateral liner tube in communication with one another through a liner juncture;

positioning a band of hydrophilic and impermeable material on the outside of the main liner member around the liner juncture;

positioning the lateral liner tube within the lateral pipe line and the main liner member within the main pipe line; and

exposing the hydrophilic band to a liquid that causes the band to swell, thereby forming a seal between the liner assembly and the main pipe lines near the pipe joint.

41. The method of claim 40 wherein the band of hydrophilic and impermeable material is ring-shaped.

42. The method of claim 40 wherein the impermeable and hydrophilic material is a hydrophilic paste.