JP2006082272A - Liner for regenerating and repairing existing pipe and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liner for regenerating and repairing an existing pipe constituted so as to be certainly and closely bonded to the inside surface of the existing pipe while preventing the occurrence of wrinkles or projections even in the bend part of the existing pipe and capable of certainly preventing the occurrence of a crack in the bent part, and its manufacturing method. <P>SOLUTION: In the liner for regenerating and repairing the existing pipe which is formed by incorporating a fibrous reinforcing material in a curable resin pipe and inserted in the existing pipe to line the inner peripheral surface of the existing pipe, a plurality of the fibrous reinforcing materials 10 are laminated to form layers (12 and 14) wherein the respective fibers of them are arranged in the same direction and the arranging direction of the fibers of each of the laminated layers are inclined at 50-70° with respect to the pipe axial direction of the existing pipe so that the angles of inclination of the fibers are alternately set to opposite directions at every laminated layer and the respective fibrous reinforcing material layers are sewn so as to keep the fiber arranging directions of the respective layers and the laminated state of them. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an existing pipe rehabilitation repair liner that is a curable resin pipe that is lined on the inner peripheral surface of an existing pipe in order to repair existing pipes such as water pipes and sewer pipes buried in the ground, and the production thereof. Regarding the method.

  Repairs such as water stop for existing pipes such as water pipes and sewage pipes buried in the ground have recently been replaced with a method of exposing existing pipes by excavation and repairing existing pipes from the outer periphery. The method of lining the inner peripheral surface of a pipe with a lining pipe is attracting attention in terms of shortening the construction period. For example, Patent Document 1 (Patent No. 3051277) discloses a curable resin pipe, and as a fibrous reinforcing material to be included for reinforcement of the curable resin pipe, the pipe axis direction of the existing pipe is used. Thus, a fiber layer in which rovings, which are two bundles of fibers inclined in different directions, are crossed and used is used.

  That is, in the existing pipe lining method, the curable resin pipe is required to be in close contact with the inner peripheral surface of the existing pipe. However, the close contact of the curable resin pipe is relatively achieved on the inner peripheral surface of the linear existing pipe. Easy. However, as shown in FIG. 7, for example, when a bent tube 401 is used as a part of the existing tube 400 and bent, the bent outer peripheral portion of the curable resin tube 402 serving as a rehabilitation liner is not provided. A tensile force acts, and a compressive force acts on the curved inner peripheral side portion. For this reason, there is a possibility that the curved outer peripheral side portion of the curable resin tube 402 does not securely adhere to the inner peripheral surface of the existing tube 400, and conversely, the curved inner peripheral portion of the curable resin tube 402 has a curable property. There is a possibility that wrinkles, protrusions, or the like protruding into the resin tube 402 may occur.

  Here, with respect to the generation of wrinkles, protrusions, and the like, the fiber elongation direction of the fibrous reinforcing material included in the curable resin tube for reinforcing the curable resin tube is one factor. For example, when a fibrous reinforcing material is installed so as to extend along the tube axis direction of the existing pipe, wrinkles are likely to occur on the inner peripheral side of the bent portion of the existing pipe. On the other hand, when the fiber direction of the fibrous reinforcing material is set along the direction orthogonal to the tube axis direction of the existing pipe, the strength in the tube axis direction is inferior even though the generation of wrinkles on the inner peripheral side of the bent portion can be prevented. Result.

  Therefore, in the technology disclosed in Patent Document 1, a roving which is a bundle of two fibers inclined in different directions with respect to the tube axis direction of the existing pipe is provided with a fibrous reinforcing material included for reinforcing the curable resin pipe. It is formed as a fiber layer woven by crossing. With this configuration, a curable resin pipe that reliably adheres to the inner peripheral surface of a bent existing pipe, does not cause wrinkles, and can improve mechanical strength is achieved.

Japanese Patent No. 3051277

  According to the technique of the above-mentioned Patent Document 1, it is possible to prevent the generation of wrinkles and protrusions at the bent portion while preventing the strength of the curable resin tube from being lowered, and the occurrence of breakage such as puncture and the flow of the resin tube over time. Inhibition can be prevented, and accumulation of dust and sediment can be eliminated. However, since the reinforcing fibers are woven in a bundle shape, a portion corresponding to the weave or the stitch is a bent portion, in particular, a portion having an enlarged size at the outer peripheral portion. And if curable resin hardens | cures as it is, the clearance gap part of the weave will become a part which is not reinforced with the fiber material, and the possibility of causing the generation | occurrence | production of a crack remains.

  The present invention solves the above-described conventional problems, and its purpose is to prevent the occurrence of wrinkles and protrusions even at the bent portion of the existing pipe, and to securely adhere to the inner side surface of the existing pipe, and to generate cracks at the bent portion. It is an object of the present invention to provide an existing pipe rehabilitation repair liner and a method for manufacturing the same.

In order to achieve the above object, an existing pipe rehabilitation liner according to claim 1 is:
In an existing pipe rehabilitation liner that is formed by encapsulating a fibrous reinforcing material in a curable resin pipe and is inserted into an existing pipe and linings the inner peripheral surface of the existing pipe, each of the fibrous reinforcing materials is a fiber. A plurality of layers arranged in the same direction are laminated, and the arrangement direction of the fibers of each of the laminated layers is inclined by a predetermined angle with respect to the tube axis direction of the existing pipe, and the inclination angle is different for each layer of the laminated layers. In each of the layers, the dense fiber portions in which the fibers are densely assembled and the sparse fiber portions in which the fibers are loosely assembled are alternately arranged in parallel. It is characterized in that it is formed by sewing so that the arrangement direction of the fibers of each layer and the laminated state thereof are maintained.

  With this configuration, the fibrous reinforcing material that reinforces the curable resin pipe is inclined at a predetermined angle with respect to the pipe axis direction of the existing pipe, so that the followability to the bent portion of the existing pipe is good. Further, compared to the fiber direction extending in the tube axis direction and the fiber direction perpendicular to the tube axis direction, wrinkles and protrusions are not generated on the inner peripheral side and outer peripheral side of the bent portion, and the strength is not deteriorated. Furthermore, since there is no state of knitting or weaving, there is no gap between the reinforcing members at the stitches or the stitches at the bent portions, and the occurrence of cracks or the like in the curable resin at that portion can be prevented. In particular, due to the alternating parallel arrangement of the dense fiber portion and the sparse fiber portion, wrinkle generation is prevented by the sparse fiber portion approaching a denser state at the inner peripheral portion of the bent portion, and the dense fiber portion is more sparse at the outer peripheral portion. Therefore, it is possible to prevent the reinforcing member from being biased or not present, and to reliably prevent the adhesion at the bent portion and the fibrous reinforcing member from being biased or generated. The number of layers of the fibrous reinforcing material can be appropriately changed as long as it is two or more.

The existing pipe rehabilitation liner according to claim 2 is:
An inclination angle of each layer of the fibrous reinforcing material with respect to the tube axis direction in the fiber arranging direction is set between 50 degrees and 70 degrees. It is confirmed that such an angle is experimentally good, that is, excellent in ensuring the followability and strength at the bent portion of the existing pipe. It plays the function of tube rehabilitation.

The existing pipe rehabilitation liner according to claim 3 is:
The sparse fiber portion has a number of fibers larger than the number of fibers forming the dense fiber portion. With this configuration, the function of preventing the generation of wrinkles and protrusions that are likely to occur particularly at the inner peripheral side of the bent portion of the existing pipe, that is, the allowable range of bending in a state in which a suitable distribution of the fibrous reinforcing material is maintained is increased. be able to.

The manufacturing method of the existing pipe rehabilitation liner according to claim 4 is:
In the manufacturing method of an existing pipe rehabilitation liner, which is formed by encapsulating a fibrous reinforcing material in a curable resin pipe, and is inserted into an existing pipe and linings the inner peripheral surface of the existing pipe, The stretch direction of the fibers is substantially the same direction, and the dense fiber portions in which the fibers are densely gathered and the loose fiber portions in which the fibers are loosened and gathered than the dense fiber portions are alternately arranged in parallel. The step of forming a single layer of fibrous reinforcing material by arranging the extending direction to be inclined at a predetermined angle with respect to the tube axis direction of the existing tube, and the layer laminated on the formed single layer of fibrous reinforcing material, A step of forming a second layer of fibrous reinforcing material in the same configuration as the first layer, with the inclination angle of the fiber extending in the direction opposite to the inclination angle of the first layer, and if necessary As a layer to be laminated on the two fibrous reinforcing material layers The step of forming the third and subsequent layers of the fibrous reinforcing material in the same manner as the first layer with the inclination angle in the fiber extension direction as the reverse angle sequentially, and the fiber alignment direction of each layer of the fibrous reinforcing material And a step of sewing so as to maintain a laminated state of the plurality of fibrous reinforcing materials.

  With this configuration, the existing pipe rehabilitation repair liner having the configuration described in claim 1, that is, can follow the bent portion of the existing pipe satisfactorily, and generation of wrinkles and protrusions on the inner peripheral side and the outer peripheral side An existing pipe rehabilitation repair liner that does not cause deterioration in strength, and further prevents the occurrence of cracks in the curable resin of the curable resin without causing a gap in the reinforcing member at the bent portion. Can be manufactured.

  According to a fifth aspect of the present invention, there is provided a method for manufacturing an existing pipe rehabilitation liner, in which each layer of the fibrous reinforcing material is manufactured such that an inclination angle of the fiber arrangement direction with respect to a pipe axis direction is between 50 degrees and 70 degrees. The method for manufacturing an existing pipe rehabilitation liner according to claim 6 is characterized in that the sparse fiber portion is formed with more fibers than the dense fiber portion. .

  With these configurations, it is possible to manufacture an existing pipe rehabilitation liner having the configuration and functions described in claims 2 and 3. That is, to manufacture a liner for repairing existing pipe rehabilitation that further improves the followability at the bent part of the existing pipe and more reliably prevents the deterioration of the wrinkles and protrusion generation strength on the inner and outer peripheral sides. Can do.

  According to the existing pipe rehabilitation repair liner and the manufacturing method thereof according to the present invention, even in the bent portion of the existing pipe, the occurrence of wrinkles, protrusions and deterioration of strength is prevented over the entire circumference, and the fiber in the bent portion is further prevented. It is possible to prevent the occurrence of cracks in the cured resin due to the occurrence of gaps in the shape reinforcing material. As a result, the cured resin pipe lining the inner peripheral surface of the existing pipe is free of wrinkles and cracks inside, ensuring water-stopping performance and good flow, and is also in good contact with the existing pipe. In addition, the durability is remarkably improved. In addition, an existing pipe rehabilitation liner that exhibits such an effect can be manufactured.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic perspective view showing a fibrous reinforcing material 10 included in a curable resin pipe of an existing pipe rehabilitation repair liner according to an embodiment, and the fibrous reinforcing material 10 includes a first reinforcing material layer 12 and The example comprised from the 2nd layer of the 2nd reinforcement material layer 14 is shown.

  These two reinforcing material layers 12 and 14 are for reinforcing the curable resin tube, and the reinforcing material layers 12 and 14 are included in the curable resin tube when the curable resin tube is molded. . In order to obtain this state, the laminated first and second reinforcing material layers 12 and 14 are impregnated with resin, respectively. In addition, glass fiber, polyester fiber, etc. are used as a fiber which comprises the said fibrous reinforcement 10, and unsaturated polyester, an epoxy acrylate resin, an epoxy resin, etc. are used as curable resin.

  Also, the characteristic feature of the present invention is that, as shown in the figure, the arrangement direction of the two layers of fibers of the first reinforcing material layer 12 and the second reinforcing material layer 14 is inclined by a predetermined angle, and each is inclined in the opposite direction. It is that. In the present embodiment, the first reinforcing material layer 12 (fiber direction indicated by a solid line) is arranged with an inclination angle of about 60 degrees with respect to the fibrous reinforcing material 100 in the tube axis direction of the existing pipe that is the installation location. And the second reinforcing material layer 14 (fiber direction indicated by a broken line) are inclined by about 60 degrees in the opposite directions.

  A film not shown is attached to the front and back surfaces of the fibrous reinforcing material 10 thus formed and the curable resin impregnated therein, and this is bent into a cylindrical shape as shown in FIG. Thus, the curable resin pipe 20 is formed as a liner for repairing existing pipe rehabilitation.

  FIG. 3 is a partially cutaway enlarged view of the fibrous reinforcing material 10 according to the present embodiment. The characteristic configuration of the fibrous reinforcing material 10 is that the fibers of the reinforcing material layers 12 and 14 are densely arranged. The dense fiber portions 12a and 14a are aggregated, and the sparse fiber portions 12b and 14b are sparsely aggregated (sparsely), and they are alternately arranged. That is, the fibers are in an aggregated state of sparse / dense / sparse / dense and are arranged without gaps.

  These dense fiber portions 12a and 14a and sparse fiber portions 12b and 14b are not constrained and focused, but are simply assembled. For example, the dense fiber portions 12a and 14a can be used as what is called direct roving, and the sparse fiber portions 12b and 14b are sparse by applying a strong wind or the like to a set of dense fibers such as direct roving. The so-called bulk roving obtained by doing so can be used. The dense fiber portions 12a and 14a and the sparse fiber portions 12b and 14b are composed of, for example, thousands of fibers, and the number may be appropriately adjusted.

  Next, FIG. 4 exemplifies a sewing method, and maintains the respective fiber directions of the reinforcing material layers 12 and 14 of the fibrous reinforcing material 10 and the first reinforcing material layer 12 and the second reinforcing material layer 14. Sewing is performed to stabilize the laminated state. For example, in addition to the sewing of the corners of the fibrous reinforcing material 10, the dense fiber portions 12 a, as in a predetermined part (indicated by reference numeral 40 in the figure) sewing line, to the extent that the fiber alignment state is maintained. 14a and the sparse fiber portions 12b and 14b are passed once, and the next is passed through the assembly of each fiber portion, and the dense fiber portions 12a and 14a and the sparse fiber portions 12b and 14b are each half and mixed into bundles. Sewing as you do.

  FIG. 5 is a partial explanatory view showing a state where the completed existing pipe rehabilitation repair liner 50 is actually installed in the existing officer 400. As shown in the drawing, a waterproof film 52 is applied as the outermost layer of the existing pipe rehabilitation liner 50 so as to protect the existing pipe rehabilitation repair liner 50 until it is cured from moisture in the existing pipe. ing. A protective film 54 is also attached to the innermost layer, but this is for preventing resin leakage from the fibrous reinforcing material 10 impregnated with resin, and is finally removed. Is normal.

  Next, actual installation of the existing pipe rehabilitation repair liner 50 configured as described above on the existing pipe will be described. First, the existing pipe rehabilitation liner 50 before curing is prepared. This is, for example, by making the first reinforcing material layer 12 and the second reinforcing material layer 14 sewn in the above-described laminated state into a cylindrical shape, In that state, a film is stuck on the outer peripheral surface and the inner peripheral surface. Thereafter, a curable resin is filled between the outer and inner films. Thereby, the existing pipe rehabilitation repair liner 50 before hardening is completed.

  Then, the uncured existing pipe rehabilitation repair liner 50 in a flexible state is installed in the existing pipe. There are a pull-in method and a reverse insertion method for installing the existing pipe rehabilitation repair liner 50 in the existing pipe. Here, an example of installation by the reverse insertion method will be described with reference to FIG. First, reverse insertion is performed while supplying fluid pressure so that the inner peripheral surface of the existing pipe 400 to be repaired is an outer peripheral surface and is in close contact with the inner peripheral surface of the existing pipe 400. . This reverse insertion can be easily performed because the curable resin 13 of the existing pipe rehabilitation repair liner 50 is in an uncured state.

  The fluid pressure is supplied by supplying pressurized air between the inverted portion 50a and the non-inverted portion 50b of the existing pipe repair / repair liner 50 by means of a compressor and an air pipe (not shown). As a result, the non-inverted portion 50 b of the existing pipe rehabilitation repair liner 50 is gradually inverted and inserted into the existing pipe 400. Further, the inverted portion 50a is brought into close contact with the inner peripheral surface of the existing pipe 400 sequentially by pressurized air.

  At the time of reverse insertion, the rear end portion of the existing pipe rehabilitation repair liner 50 is closed, and one end side of the cable is connected to the rear end. A pulling machine having a drive pulley, a driven pulley, a DC motor, a speed reducer, an encoder, and the like is connected to the other end of the cable. By this pulling machine, the reverse insertion speed of the existing pipe rehabilitation repair liner 50 is increased. Synchronously with this, the cable is fed at a constant speed.

  In this way, when reverse insertion is performed, the bent portion of the existing pipe is inserted while being bent while closely contacting the inner surface thereof. The existing pipe rehabilitation repair liner 50 is subjected to a tensile force on the outer peripheral portion of the bent portion having a large curvature radius, and conversely, a compressive force is applied to the inner peripheral side having a small curvature radius. In such an operating state, the existing pipe rehabilitation repair liner 50 according to the present embodiment has the drawbacks and pipes when the fibrous reinforcements are arranged in the same direction as the tubular axial fiber reinforcement 100 of the existing pipe. The function which eliminated both the faults at the time of arranging a fibrous reinforcement in the direction orthogonal to the axial fibrous reinforcement 100 can be exhibited. That is, since the fibrous reinforcing material 10 included in the curable resin tube 20 is composed of fiber layers inclined about 60 degrees in the opposite direction with respect to the tubular axial direction fibrous reinforcing material 100, the existing pipe is bent. Smooth followability to the part is obtained.

  Furthermore, in the present embodiment, two layers of fibers arranged in parallel and without gaps at opposite inclination angles are laminated, and in addition, the fibers of each layer are dense fiber portions 12a and 14a which are sparse / dense aggregate portions. The loose fiber portions 12b and 14b are alternately arranged. Therefore, on the inner peripheral side of the bent portion, the sparse fiber portions 12b and 14b change into a dense state in accordance with the radius of curvature, thereby reliably preventing the generation of wrinkles and protrusions. On the other hand, on the outer peripheral side, on the contrary, the dense state of the dense fiber portions 12a, 14a changes to correspond to the sparse state corresponding to the radius of curvature, so that it is like a curable resin tube having a knitted or woven structure. There are no gaps in the stitches and weaves. Therefore, it is possible to reliably avoid the occurrence of cracks due to the curing shrinkage of the resin in the gap where the fibrous reinforcing material 10 does not exist after curing.

  In addition, the reverse insertion speed of the existing pipe rehabilitation repair liner 50 into the bent portion of the existing pipe is preferably 50 cm / min or less, and particularly preferably 30 to 35 cm / min. In this way, when the existing pipe rehabilitation repair liner 50 is inserted into the existing pipe 400, the existing pipe rehabilitation repair liner 50 that is in close contact with the inner peripheral surface of the existing pipe 400 is further added to the inner peripheral surface of the existing pipe 400. Therefore, fluid pressure such as pressurized air is supplied into the existing pipe rehabilitation repair liner 50 to increase the internal pressure. As a result, the existing pipe rehabilitation repair liner 50 is pressed against the inner peripheral surface of the existing pipe 400, and in this state, the uncured curable resin is cured.

  About hardening of this existing pipe rehabilitation repair liner 50, thermosetting or photocuring is performed according to the curable resin currently used. In the case of thermosetting, the liner is cured using hot water, steam or the like, and in the case of photocuring, the liner is cured by irradiation with UV light (ultraviolet rays).

  In addition, this invention is not limited to the structure of the said embodiment, A various change is possible within the range of the summary of invention. For example, in the above embodiment, the fibrous reinforcing material 10 is composed of two highly flexible reinforcing material layers. However, the fibrous reinforcing material 10 is composed of three or more reinforcing material layers according to the pipe diameter of the existing pipe to be installed. It is also possible to configure. In that case, the fiber arrangement direction of each reinforcing material layer is set so that the adjacent layers have an inclination angle opposite to the tube axis direction. Moreover, about the number of glass fibers etc. which comprise a dense fiber part and a sparse fiber part, it is possible to set variously.

It is a schematic perspective view which shows the structure of the fibrous reinforcement which concerns on embodiment of this invention. It is a schematic perspective view which shows the state which comprised the fibrous reinforcement material in the cylindrical shape. It is a partially notched perspective view which shows the specific laminated structure of a fibrous reinforcement. It is explanatory drawing which shows the sewing method of the reinforcing material layer of a lamination | stacking state. It is a fragmentary sectional view showing the state where the existing pipe rehabilitation repair liner concerning an embodiment was installed. It is explanatory drawing about the method of installing the existing pipe rehabilitation repair liner in an existing pipe. It is explanatory drawing of the problem in installation of the existing existing pipe repair repair liner.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Fibrous reinforcement material 12 1st reinforcement material layer 14 2nd reinforcement material layer 12a, 14a Dense fiber part 12b, 14b Sparse fiber part 52, 54 Film 400 Existing pipe

Claims (6)

In an existing pipe rehabilitation repair liner that is formed by encapsulating a fibrous reinforcing material in a curable resin pipe and is inserted into an existing pipe to line the inner peripheral surface of the existing pipe,
The fibrous reinforcement is
A plurality of layers in which fibers are arranged in the same direction are laminated,
The arrangement direction of the fibers of each layer laminated is inclined by a predetermined angle with respect to the tube axis direction of the existing pipe, and the inclination angle is alternately inclined in the opposite direction for each layer of the lamination,
Each of the layers is installed in such a manner that dense fiber portions in which the fibers are densely gathered and sparse fiber portions in which the fibers are loosely gathered are alternately arranged in parallel.
An existing pipe rehabilitation repair liner, which is formed by sewing so that the arrangement direction of fibers of each layer and the laminated state thereof are maintained.   2. The existing pipe rehabilitation liner according to claim 1, wherein an inclination angle of each layer of the fibrous reinforcing material with respect to a pipe axis direction of the fiber arrangement direction is set between 50 degrees and 70 degrees. .   The liner for repairing existing pipe rehabilitation according to claim 2, wherein the sparse fiber portion has a number of fibers larger than the number of fibers forming the dense fiber portion. In the manufacturing method of an existing pipe rehabilitation liner, which is formed by encapsulating a fibrous reinforcing material in a curable resin pipe, inserted into the existing pipe and lining the inner peripheral surface of the existing pipe,
The fibrous reinforcing material has substantially the same direction of fiber extension, and dense fiber portions in which the fibers are densely assembled and sparse fiber portions in which the fibers are sparser than the dense fiber portions and gathered alternately And further forming a single layer of fibrous reinforcing material by arranging the extension direction inclined at a predetermined angle with respect to the pipe axis direction of the existing pipe, and
As a layer to be laminated on the formed one-layer fibrous reinforcing material layer, an inclination angle of the fiber in the extending direction is set to an angle inclined in a direction opposite to the inclination angle of the first layer, with the same configuration as the first layer. Forming a layer of a fibrous reinforcing material of a layer;
If necessary, as a layer to be laminated on the two-layer fibrous reinforcing material layer, the third and subsequent fibrous reinforcing materials are formed in the same manner as in the first layer by sequentially setting the inclination angles of the fibers in the reverse direction. Forming a layer of
A step of sewing so as to maintain the fiber arrangement direction of each layer of the fibrous reinforcing material and the laminated state of the plurality of fibrous reinforcing materials;
The manufacturing method of the existing liner for pipe rehabilitation repairing characterized by including. The production of each layer of the fibrous reinforcement is as follows:
The manufacturing method of the existing pipe rehabilitation liner according to claim 4, wherein an inclination angle of the fiber arrangement direction with respect to a pipe axis direction is set between 50 degrees and 70 degrees.   6. The method for manufacturing an existing pipe rehabilitation liner according to claim 5, wherein the sparse fiber portion is formed with a larger number of fibers than the dense fiber portion.

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