Lining of "Tees" and "Wyes" in pipelines or passageways

• US 5,927,341 A
• Filed: 03/25/1996
• Issued: 07/27/1999
• Est. Priority Date: 09/25/1993
• Status: Expired due to Term

• Current Assignee: INA Acquisition Corporation (Aegion Corp.)
• Original Assignee: Insituform Netherlands BV Incorporated (Insituform)
• Inventors: Taylor, Kevan Charles
• Primary Examiner(s): BRINSON, PATRICK F
• Application Number:
  US08/604,975
• Time in Patent Office: 1,219 Days
• Field of Search: 138/98, 138/97, 264/269, 264/267, 264/516, 156/94, 156/287, 156/294, 156/574
• US Class Current: 138/98
• CPC Class Codes: B29C 63/28 applied by "rubber" bag or diaphragm
• CPC Class Codes: B29L 2031/246 T-joints
• CPC Class Codes: F16L 55/1654 and being inflated
• CPC Class Codes: F16L 55/179 specially adapted for bends, branch units, branching pipes or the like

Abstract

The invention provides a tailored assembly of a flexible resin absorbent material (22, 24, 26). It is in the form of a "T" and is of tubular cross section. The arms of the T are intended to lie on the surface of a main underground pipe which the leg of the T extends into a lateral pipe which connects with the main pipe. The whole assembly is soaked in curable synthetic resin and it is placed in position and held there whilst resin cures by means of an inflatable bag (28) which is located inside the assembly and is also tailored to T configuration.

Claims

1. A lining for sealing the region of a lateral/main pipe connection, comprising a length of main pipe tubular structure for application to the full circumference of the surface of the main pipe on both sides of the lateral connection pipe, said length of main pipe tubular structure having a wall aperture to be aligned with the lateral pipe, and a lateral extension tubular structure bonded to the main pipe tubular structure at the aperture and extending from said aperture into the lateral pipe, said lateral tubular structure and main pipe tubular structure, each formed of a tubular segment having at least one layer of a resin absorbent material which in use is impregnated with curable synthetic resin.

2. The lining of claim 1, wherein the main pipe tubular structure is formed with said aperture therein and the lateral extension tubular structure includes at one end a collar disposed within the main pipe tubular structure whereby in use the extension tubular structure is fed through the aperture in the main pipe tubular structure so that the collar lies to the inside of the main pipe tubular structure.

3. The lining of claim 2, wherein the collar is formed of resin absorbent material similar to that of the lateral extension tubular structure.

11. The lining of claim 3, wherein the collar is bonded to the inside of the main pipe tubular structure about the aperture.

4. An apparatus for installing a lining for sealing the region of a lateral/main pipe connection having a main pipe tubular portion having an aperture to be aligned with the lateral pipe and including at least one layer of resin absorbent material for application to the full circumference of the main pipe on both sides of the lateral opening and having a tubular lateral extension bonded to the main pipe tubular portion at the aperture, comprising an expandable elongated inflation bladder having an inflatable arm portion for inflating the main pipe tubular structure and the extension tubular structure simultaneously.

5. The apparatus of claim 4, wherein the inflation bladder is of a robust inflatable material which has a main elongated inflation portion for positioning inside the main line tubular structure and an inflatable arm portion which lies inside the extension tubular structure when in use.

6. The apparatus of claim 4, wherein the inflation is designed to permit bladder is formed with a longitudinal passageway to allow the flow of liquid along the main pipeline or passageway when the bladder is inflated.

7. The apparatus of claim 6, further including an elongated central core formed so that liquid can pass therethrough and the inflation bladder is mounted on the core.

12. The apparatus of claim 5, wherein the inflatable material is a reinforced silicone rubber.

8. A method of installation of a lining for sealing the region of a lateral/main pipe connection having a main pipe tubular length for application to the full circumference of the main pipe on both sides of the lateral opening including at least one layer of resin absorbent material and having an aperture to be aligned with the lateral pipe and having a tubular lateral extension arm bonded to the main pipe tubular structure at the aperture utilizing an apparatus having an inflation member with a main pipe tubular portion with an aperture and an arm portion bonded to the aperture, comprising

deflating the inflation bladder and pushing the arm inwardly to be inverted into the inflation bladder,

positioning the inflation bladder inside the main tubular structure which is impregnated with a curable resin,

inflating the inflation bladder so that the arm everts into the extension tubular structure

impregnating the arm with resin,

deflating the bladder (28) inflation is then deflated again, and

inverting the arm into the inside of the inflation bladder, along with the extension tubular structure.

9. The method of claim 8, further including,

introducing the assembly of the impregnated lining and inflation bladder into a main pipe with a lateral pipe until the inverted arm and extension tubular structure are aligned with the lateral pipe and

inflating the inflation bladder which causes the main tubular structure to be inflated against the main pipe (10) on opposite sides of the lateral pipe (12), and the extension tubular structure to be everted into the lateral pipe (12) and against the lateral pipe surface, and

maintaining the assembly in this condition while the resin is caused or allowed to cure.

10. The method of claim 9, wherein after curing has been completed, and the lining assumes a rigid condition, the bladder is again deflated and removed from the lining piece which remains in place.