Liner tube for sewer rehabilitation and method for producing same

Abstract

A liner tube (1) for rehabilitating sewers and water drainage ducts, with an inner film tube (2), a first layer (4) arranged thereon made of nonwoven material, and a second layer (6) made of glass fiber material and arranged on the layer (4) made of nonwoven material, is characterized in that the first layer (4) contains at least one overlapping wound strip made of nonwoven material, which is impregnated with a fluid reaction resin which can be cured by light or heat, and in that the second layer (6) contains at least one first strip (6a) which is impregnated with a fluid reaction resin and made of glass fiber material, which has glass fibers (8) extending in the longitudinal direction of the liner tube. The invention furthermore relates to a method for producing a liner tube of this kind.

Claims

1. A liner tube for rehabilitating sewers and water drainage ducts, comprising: an inner film tube, a first layer made of nonwoven material arranged on the inner film tube, and a second layer made of glass fiber material arranged on the first layer, wherein the first layer contains at least one overlapping wound strip made of nonwoven material, impregnated with a fluid reaction resin that can be cured by light or heat, and wherein the glass fiber material of the second layer comprises a first and a second overlapping laid glass fiber strip composed of a glass fiber textile, wherein at least one of the laid glass fiber strips is impregnated with a fluid reaction resin, and wherein the at least one glass fiber strip comprises glass fibers extending in the longitudinal direction of the liner tube.

2. The liner tube according to claim 1, wherein the at least one strip of nonwoven material of the first layer has a thickness between 0.5 mm and 2 mm, and a width between 200 and 700 mm, and/or the first layer contains at least two separate strips of nonwoven material one on top of the other.

3. Liner tube according to claim 1, wherein the first layer has a thickness in the range of 3 mm and 8 mm.

4. The liner tube according to claim 1 wherein the reaction resin is a reaction resin cured by UV light.

5. The liner tube according to claim 1 wherein the nonwoven material is or contains a plastic nonwoven material.

6. The liner tube according to claim 1 wherein the nonwoven material contains glass fibers.

7. The liner tube according to claim 1, further comprising an outer film tube of a circumferentially stretchable plastic material, arranged around the second layer.

8. A method for producing a liner tube comprising: forming a first cohesive nonwoven layer by overlapping helical winding of at least one strip of nonwoven material impregnated with a fluid reaction resin about a circumferentially closed inner film tube and arranging a first and a second overlapping strip of glass fiber material composed of a glass fiber textile on the nonwoven layer, wherein at least one strip of the glass fiber material is impregnated with fluid reaction resin, and wherein at least one strip of glass fiber material comprises glass fibers extending in the longitudinal direction of the liner tube.

9. The method according to claim 8, wherein the strip of nonwoven material is impregnated with the reaction resin prior to the winding.

10. The method of claim 8, wherein the first cohesive nonwoven layer is transparent to UV light.

11. The method of claim 8, wherein the majority of glass fibers in the at least one strip of glass fiber material are oriented in the longitudinal direction of the liner tube.

12. The liner tube according to claim 5 wherein the nonwoven material is or contains a plastic nonwoven material comprising at least one of a polyester nonwoven material and/or a polyethylene nonwoven material and/or a polyacrylonitrile nonwoven material.

13. The liner tube according to claim 6 wherein the nonwoven material contains glass fibers comprising nondirectional short fibers of recycled and/or comminuted glass fiber material.

14. The liner tube according to claim 7, wherein the outer film tube of a circumferentially stretchable plastic material is not transparent to light, especially a composite film of polyethylene, polyamide and polyethylene, is arranged around the second layer.

15. The liner tube according to claim 14, wherein the stretchable plastic material is a composite film of polyethylene, polyamide or polyethylene.

16. A liner tube for rehabilitating sewers and water drainage ducts, comprising: an inner film tube, a first layer made of nonwoven material arranged on the inner film tube, and a second layer made of glass fiber material arranged on the first layer, wherein the first layer contains at least one overlapping wound strip made of nonwoven material, impregnated with a fluid reaction resin that can be cured by light or heat, and the nonwoven material contains glass fibers comprising non-directional short fibers of at least one of recycled or comminuted glass fiber material, and wherein the second layer comprises at least one strip made of glass fiber material and impregnated with a fluid reaction resin, and wherein the at least one strip made of glass fiber material comprises glass fibers extending in the longitudinal direction of the liner tube.

Description

(1) The drawings show:

(2) FIG. 1 a schematic cross section view of the liner tube according to the invention.

(3) As is shown in the representation of FIG. 1, a liner tube 1 for the rehabilitation of sewers and drainage lines, not otherwise shown, comprises an inner film tube 2, on whose outside is placed a first layer 4 of a striplike nonwoven material, especially a felt or polyester nonwoven material. For putting the first layer 4 in place, a winding device not otherwise shown is used, such as that described for example in WO-A 95/04646 of the applicant. Next, there is placed on the at least one layer 4 of striplike nonwoven material, a second layer 6 in the form of a first strip 6a of glass fiber material, impregnated with a fluid reaction resin, having glass fibers 8 extending in the longitudinal direction of the liner tube. The first strip 6a of glass fiber material is preferably a glass fiber textile, which preferably likewise possesses glass fibers running in the transverse direction to the glass fibers 8, not being otherwise shown in the figure. The first strip 6a of glass fiber material is preferably arranged, after the winding of the first layer 4 of nonwoven material, directly on its underside and serves preferably as a lengthwise traction strip, on which the liner tube 1 is pulled into a sewer being rehabilitated.

(4) As can be further seen from the representation of FIG. 1, a second strip 6b of glass fiber material is furthermore arranged on the top side of the first nonwoven layer 4, preferably likewise being a glass fiber textile, and overlapping the first strip 6a at both ends in a range of, e.g., 30 to 50 mm.

(5) In the preferred sample embodiment of the invention, an outer film tube 10 is preferably arranged around the second layer 6, which is at least nontransparent to the particular light wavelength used in the case of reaction resins which are cured by irradiation with light, especially UV light.

(6) Furthermore, in an embodiment of the invention not otherwise shown, a further protective tube of tear-resistant material can be arranged around the outer film tube 10, having a circumferentially stretchable section extending along the length of the protective tube, which is circumferentially shortened when the tube is pulled into the sewer and only expands circumferentially upon expanding of the liner tube 1 with the aid of compressed air, making possible a radial expansion of the first and second layer 4, 6, so that the outside of the liner tube 1 may lie against the inner wall of the sewer during the curing.

LIST OF REFERENCE NUMBERS

(7) 1 Liner tube 2 Inner film tube 4 First layer of striplike nonwoven material 6 Second layer of glass fiber material 6a First strip of glass fiber material 6b Second strip of glass fiber material 8 Glass fibers running in the longitudinal direction of the liner tube 10 Outer film tube