Cured in place liner system and installation methods
A cured in place liner system and associated connections and methods are disclosed. The cured in place pipe system forms a completely rehabilitated, stand-alone, fluid-tight flow path between upstream and downstream portions of an existing pipe system. The rehabilitated flow path is stand-alone in that the liner system does not rely on structure of the portion of the pipe system through which the liner system is installed to define the fluid-tight flow path. The flow path between upstream and downstream portions of the liner system is defined by and made fluid-tight solely by components of the rehabilitation system such as cured in place liners and couplers. The portion of the pipe system through which the rehabilitation system is installed merely provides a path (e.g., through the ground) through which the cured in place liner system can be inserted. After the cured in place liner system is installed, the liner system forms a fluid-tight flow path between an upstream portion of the pipe system and a downstream portion of the pipe system. Various types of connections may be used. In addition, various types of methods may be used in forming the connections, such as using a mold to cure connecting sections of the cured in place liners in desired configurations (e.g., having a generally circular outer profile) for forming connections with the liners.
1. A rehabilitated host pipe comprising:
an existing host pipe extending along an axis;
a sleeve positioned at an end of the pipe; and
a cured in place pipe liner that is cured in place along an inside surface of the pipe, the liner extending along the axis into the sleeve, the liner being bonded to the sleeve to form a coupling section extending out of the end of the pipe along the axis, the coupling section having an inner surface formed by the liner and an outer surface formed by the sleeve, the inner surface and the outer surface being arranged so that a radial line extending from the axis passes through both the inner and outer surfaces;
a coupler mounted on the outer surface of the coupling section so that the radial line that passes through the inner surface and the outer surface of the coupling section also passes through the coupler.
2. A rehabilitated host pipe as set forth in claim 1 wherein the liner and sleeve comprise the same material.
3. A rehabilitated host pipe as set forth in claim 1 wherein the sleeve and the pipe have interior lumens defining inner diameters of substantially equal size and being substantially aligned with one another.
4. A rehabilitated host pipe as set forth in claim 1 wherein the liner conforms to an inside surface of the host pipe.
5. A rehabilitated host pipe as set forth in claim 1 wherein the liner conforms to an inside surface of the sleeve.
6. A rehabilitated pipe system comprising the rehabilitated host pipe of claim 1 , wherein the host pipe comprises a first host pipe and the liner comprises a first liner, the rehabilitated pipe system further comprising a second host pipe and a second liner extending through the second host pipe and being sealed to the first liner such that the first and second liners define a standalone fluid flow path having no fluid communication with the existing host pipe, the coupling section being located outside the first host pipe and the second host pipe.
7. A rehabilitated pipe system as set forth in claim 6 wherein the coupler couples the first liner to the second liner and seals the first and second liners to one another, the second liner extending along an axis which is co-axial with the axis of the first liner at the coupler.
8. A rehabilitated host pipe comprising:
an existing host pipe extending along an axis;
a cured in place pipe liner that is cured in place along an inside surface of the pipe, the cured in place pipe liner extending lengthwise along the axis and having a connecting portion extending lengthwise out of an end of the pipe; and
a tubular reinforcing member positioned generally at the end of the pipe and bonded to the connecting portion of the liner, the reinforcing member and connecting portion of the liner forming a coupling section, the reinforcing member providing the coupling section with resistance against buckling;
a coupler mounted on the reinforcing member so that the coupler and connecting portion of the liner forming the coupling section sandwich the reinforcing member therebetween.
9. A rehabilitated host pipe as set forth in claim 8 further comprising epoxy positioned between the liner and reinforcing member and bonding the reinforcing member to the liner.
10. A rehabilitated host pipe as set forth in claim 9 wherein the epoxy is applied to an inside surface of the reinforcing member.
11. A rehabilitated host pipe as set forth in claim 10 wherein the reinforcing member comprises glass.
12. A rehabilitated host pipe as set forth in claim 10 wherein the reinforcing member comprises resin containing material.
13. A method for rehabilitating a fluid conveying passage having an axis, the method comprising:
positioning a liner comprising a material impregnated with a curable polymer in the passage so that the liner extends lengthwise along the axis and generally conforms to a perimeter of the passage;
curing the curable polymer while the liner is positioned in the passage to form a cured liner, wherein the cured liner defines a fluid conveying lumen extending through the passage; and
removing a structure defining a portion of the passage after curing the curable polymer such that a perimeter surface of an end portion of the cured liner that was pressed against the structure during the step of curing the curable polymer is exposed to the exterior of the passage after the step of removing the structure, wherein the perimeter surface faces radially outward with respect to the axis of the passage.
14. The method as set forth in claim 13 wherein removing a structure defining a portion of the passage comprises removing a tubular mold from the cured liner.
15. The method as set forth in claim 14 further comprising positioning the tubular mold end to end with a pipe segment of a previously installed pipe system prior to positioning the liner, the tubular mold and pipe segment defining at least a portion of the passage.
16. The method as set forth in claim 13 further comprising coupling a coupler to the exposed end portion of the liner to fluidly connect the lined passage to another fluid conveying structure.
17. The method as set forth in claim 13 further comprising adhering a reinforcing member to the exposed end portion of the liner.
18. The method as set forth in claim 17 further comprising coupling a coupler to the exposed end portion of the liner to fluidly connect the lined passage to another fluid conveying structure after adhering the reinforcing member to the exposed end portion of the liner.
19. The method as set forth in claim 13 further comprising applying a resin to an outside surface of the exposed portion of the liner.
20. The method as set forth in claim 13 further comprising adhering a reinforcing member to the exposed portion of the liner.