Expandable liner for the protection and strengthening of existing pipes
View Patent ↗A method of lining an interior of a pipe in need of repair comprises providing a carrier tube having one or more expandable materials, coating the carrier tube with a binder, securing one or more layers of a fiber-laden material along an exterior surface of the carrier tube with the assistance of the binder. The carrier tube is delivered, together with the at least one layer of the fiber-laden material and the binder, to a targeted location inside a pipe in need of repair. The carrier tube comprises a first diameter while the carrier tube is being delivered to the targeted located inside the pipe in need of repair. The method additionally comprises radially expanding the carrier tube from the first diameter to a second diameter, such that the one or more layers of the fiber-laden material and the binder at least partially contact and/or adhere to an interior wall of the pipe.
1. A liner for lining an interior surface of a host pipe at least between two access points of the host pipe separated by a distance, the liner comprising first and second ends and a length extending from the first end to the second end, the length of the liner being at least as long as the distance between the access points of the host pipe to cover an interior surface of the host pipe in the longitudinal direction from one of the two access points to the other of the two access points when the liner is applied to the interior surface of the host pipe, the liner further having first and second longitudinal edges and a width extending from the first longitudinal edge to the second longitudinal edge, the width of the liner being at least as long as an interior hoop dimension of the host pipe to cover the interior surface of the host pipe in the hoop direction when the liner is applied to the interior surface of the host pipe, the liner comprising a plurality of lengthwise oriented bundles of reinforcing fibers extending from the first end to the second end of the liner and a plurality of widthwise oriented bundles of reinforcing fibers extending transverse to the lengthwise oriented bundles from the first longitudinal edge to the second longitudinal edge of the liner, the lengthwise oriented bundles and widthwise oriented bundles being connected to each other to form a unitary liner configured to be folded about an axis extending lengthwise of the liner so that a longitudinal edge margin at the first longitudinal edge overlies a longitudinal edge margin at the second longitudinal edge into a shape for insertion into the host pipe, the lengthwise and widthwise oriented bundles of reinforcing fibers are arranged so that the liner is stronger in the widthwise direction than in the lengthwise direction.
2. A liner as set forth in claim 1 wherein the liner includes more reinforcing fibers oriented in the widthwise direction than in the lengthwise direction.
3. A liner as set forth in claim 1 wherein the liner comprises a greater number of widthwise oriented bundles of reinforcing fiber per unit area of the liner than lengthwise oriented bundles of reinforcing fibers per unit area of the liner.
4. A liner as set forth in claim 1 wherein the widthwise oriented bundles of reinforcing fibers comprise carbon fibers.
5. A liner as set forth in claim 1 wherein the lengthwise oriented bundles of reinforcing fibers comprise carbon fibers.
6. A liner as set forth in claim 1 wherein the widthwise oriented bundles of reinforcing fibers comprise a greater number of reinforcing fibers than the lengthwise oriented bundles of reinforcing fibers.
7. A liner as set forth in claim 1 wherein the widthwise bundles of fiber are positioned in side-by-side engagement with respect to each other.
8. A method of lining an interior of a section of a pipe extending from a first access point to a second access point with a curable liner, the method comprising:
positioning a carrier tube near the first access point, the carrier tube having a length for extending from the first access point to the second access point and having a hoop direction transverse to the length;
positioning a liner near the first access point, the liner having a length and a width and comprising individual bundles of reinforcing fiber extending along the width of the liner stabilized together to form a fiber-laden fabric;
impregnating the liner with a curable binder;
wrapping the liner around the carrier tube;
pulling the carrier tube and the liner conjointly into the section of the pipe such that the fabric liner extends from the first access point to the second access point;
radially expanding the carrier tube from a first diameter to a second diameter such that the binder impregnated liner contacts an interior wall of the section of the pipe when the carrier tube is radially expanded to the second diameter; and
while the binder impregnated fabric liner is in contact with the interior wall of the section of the pipe, curing the binder impregnated in the liner, thereby providing a cured liner inside the section of pipe extending from the first access point to the second access point;
wherein the step of wrapping the liner around the carrier tube is performed as the carrier tube and the liner are being pulled conjointly into the section of the pipe.
9. A method as set forth in claim 8 wherein the step of impregnating the liner is performed before the step of wrapping the liner around the carrier tube.
10. A method as set forth in claim 9 wherein the step of positioning the liner near the first access point is performed before the step of impregnating the liner.
11. A method as set forth in claim 8 wherein the step of wrapping the liner around the carrier tube comprises folding the liner into a folded configuration in which the width of the liner extends around the carrier tube and a first longitudinal edge margin of the liner overlaps a second longitudinal edge margin of the liner in the hoop direction of the carrier tube along the length of the carrier tube.
12. A method as set forth in claim 8 wherein the step of wrapping the liner around the carrier tube comprises pulling the carrier tube across a roll of the liner and removing the liner from the roll and wrapping the liner around the carrier tube at about the same rate as the carrier tube is pulled.
13. A method as set forth in claim 8 wherein the step of wrapping the liner around the carrier tube comprises forming the liner into the shape of a tube and positioning the carrier tube in an interior of the tube.
14. A method as set forth in claim 8 wherein the step of wrapping the liner around the carrier tube further comprises folding the carrier tube to have a folded width in the folded configuration that is less than the diameter of the section of the pipe.
15. A method of lining an interior section of a pipe positioned at a field site and extending from a first access point to a second access point with a curable liner, the method comprising:
positioning a carrier tube at the field site, the carrier tube having a length for extending from the first access point to the second access point and having a hoop direction transverse to the length;
positioning a liner at the field site, the liner having a length and a width and comprising individual bundles of reinforcing fiber extending along the width of the liner stabilized together to form a fiber-laden fabric;
impregnating the liner with a curable binder;
wrapping the liner around the carrier tube;
pulling the carrier tube and the liner into the section of the pipe such that the liner extends from the first access point to the second access point;
radially expanding the carrier tube from a first diameter to a second diameter such that the binder impregnated liner contacts an interior wall of the section of the pipe, curing the binder impregnated in the liner, thereby providing a cured liner inside a section of pipe extending from the first access point to the second access point;
wherein the step of wrapping the liner around the carrier tube is performed at the field site adjacent the first access point.
16. A method as set forth in claim 15 wherein the step of impregnating the liner is performed before the step of wrapping the liner around the carrier tube.
17. A method as set forth in claim 16 wherein the step of positioning the liner near the first access point is performed before the step of impregnating the liner.
18. A method as set forth in claim 15 wherein the step of wrapping the liner around the carrier tube comprises folding the liner into a folded configuration in which the width of the liner extends around the carrier tube and a first longitudinal edge margin of the liner overlaps a second longitudinal edge margin of the liner in the hoop direction of the carrier tube along the length of the carrier tube.
19. A method as set forth in claim 15 wherein the step of wrapping the liner around the carrier tube further comprises folding the carrier tube to have a folded width in the folded configuration that is less than the diameter of the section of the pipe.
20. A method as set forth in claim 15 wherein the step of wrapping the liner around the carrier tube comprises forming the liner into the shape of a tube and positioning the carrier tube in an interior of the tube.