JP4548875B2 - Base material for pipe inner surface molding - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a base material for forming an inner surface of a pipeline such as a water and sewage pipe, a gas pipe, and an oil transportation pipe.
[0002]
[Prior art]
Water and sewage pipes, gas pipes, oil transportation pipes, etc. may have strength problems such as deterioration in strength due to long-term use and leakage of transported goods in the pipeline due to damage due to the use environment. If such a strength problem occurs, replace the laying with the same pipe as in the new construction using the open-cut method, or perform partial repairs in the pipe using the non-open-cut method or the same as the new pipe in the pipe. A method of forming a new tube having a certain degree of strength is employed. Of these methods, the excavation method is often limited in areas where there is a lot of traffic on the ground of existing pipes or where multiple pipes are buried. Therefore, in recent years, a non-cutting method has come to be adopted, and as one of them, a method of forming a fiber reinforced resin composite in a pipe line is known, and this method uses a reinforced fiber in an existing pipe line. A cylindrical fiber reinforced resin composite impregnated with resin is inserted into the cylinder, and pressure is applied to the inside of the cylindrical object to expand it, the resin is cured, and a new cylindrical molded article is formed in the pipeline. Is.
[0003]
[Problems to be solved by the invention]
In the above method for forming a cylindrical fiber reinforced resin composite in a pipeline, when the cylindrical product having a design in which the outer diameter of the cylindrical product is close to the inner diameter of an existing pipeline is inserted and molded, If there is a part in which the inner diameter is slightly deformed and smaller than the outer diameter of the cylindrical object, wrinkles may occur in the cylindrical object after molding in this part. On the other hand, when a cylindrical object designed with the outer diameter of the cylindrical object slightly smaller than the inner diameter of the existing pipe line is inserted and molded, when expansion is performed by applying pressure to the inner side of the cylindrical object, expansion is not possible. If the gap is sufficient, a gap is generated between the outer layer of the cylindrical object and the inner surface of the pipe line. If this gap is large, the strength of the pipe line and the molded article against the external pressure may be insufficient even after repair.
For this reason, the outer diameter of the cylindrical object is designed to be slightly smaller than the inner diameter of the pipe in advance, and when the cylinder is expanded by applying pressure from the inside of the cylindrical object, the outer layer surface of the cylindrical object is made the inner surface of the pipe. It is desired to mold it with sufficient contact.
[0004]
Nonwoven fabric is used as a base material suitable for such expansibility. However, when only a nonwoven fabric is used as a base material, it is suitable for the balance of strength directionality, but is required for a molded product of a pipeline. In order to obtain strength in the circumferential direction, it is necessary to increase the thickness of the molded product. However, if the thickness of the molded product is increased, the cross-sectional area of the pipeline after repair will decrease, and this will inevitably cause a reduction in flow capacity in the pipeline, so the thickness after repair should be as thin as possible. Is desired.
[0005]
In addition, when using a woven fabric with excellent strength as a base material, in a woven fabric having a general configuration, there is little difference in the weight ratio of the interlaced yarns that make up the woven fabric. A phenomenon occurs in which the yarns rub against each other, and considerable pressure is required for expansion.
In addition, even if a normal plain woven fabric is arranged obliquely with respect to the axial direction of the pipe line, a phenomenon occurs in which the yarns rub against each other when expanding like the above-mentioned biased woven fabric, and a considerable pressure is required for the expansion. Will be required. Further, when the warp of the plain woven fabric is arranged at an angle of 0 degree or 90 degrees with respect to the axial direction of the pipe line, the strength against the pipe pressure can be obtained, but the above expansion cannot be expected.
[0006]
Therefore, the present invention has been made to solve such a problem, and has good expansibility after insertion into a pipeline, does not cause wrinkles after molding, and has a circumferential strength. An object of the present invention is to provide a base material for forming an inner surface of a pipe line excellent in the above.
[0007]
[Means for Solving the Problems]
In order to solve such problems, the present invention provides an inner surface molding for repairing the inside of a fiber reinforced resin laminate formed by impregnating a resin into a reinforced fiber laminate obtained by laminating a plurality of reinforcing fiber substrates. A weight ratio of reinforcing yarns to the shape-retaining yarn, wherein the shape-retaining yarn is entangled with a reinforcing yarn composed of long fibers in which at least one layer of the reinforcing fiber substrate is arranged in one direction. The unidirectional reinforced fabrics and nonwoven fabrics each having a length of 10 or more are alternately laminated, and the nonwoven fabrics are arranged in the innermost layer, and the arrangement direction of the reinforced yarns of the unidirectional reinforced fabrics It is arranged so as to have an angle of 30 to 85 degrees with respect to the axial direction.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The inner surface molding base material of the present invention is an inner surface molding base material for repairing the inside of a pipe line composed of a fiber reinforced resin laminate obtained by impregnating a resin into a reinforcing fiber laminate obtained by laminating a plurality of reinforcing fiber substrates. However, it is inserted into an existing pipeline to be repaired, and pressure is applied to the inside of the cylindrical object to expand it, and the resin is cured to form a new cylindrical molded article in the pipeline. Used for. This inner surface forming base material is formed in a cylindrical shape or a sheet shape, and when it is formed in a cylindrical shape, it is inserted into an existing pipeline to be repaired as it is, as described above. If it is molded and formed into a sheet, the end of the sheet is combined into a cylindrical shape and inserted into the existing pipeline to be repaired. Is done.
[0009]
In the present invention, the strength of the base material for inner surface molding is held by the reinforcing yarn, so that the strength is not particularly required for the shape-maintaining yarn, and the form of the unidirectional reinforcing fabric is entangled with the reinforcing yarn. Rather, it is preferable to use a thin yarn with which the angle of the reinforcing yarn can be easily moved when the inner surface forming base material is expanded in a subsequent process. Therefore, the weight ratio of the reinforcing yarn to the shape holding yarn is 10 or more. In addition, in order to facilitate the angular movement of the reinforcing yarn when the inner surface forming base material is expanded in the subsequent process, the arrangement direction of the reinforcing yarn of the unidirectional reinforcing fabric is relative to the axial direction of the pipeline to be repaired. The angle is 30 to 85 degrees. Furthermore, as described above, the weight ratio of the reinforcing yarn to the shape retaining yarn is set to 10 or more, that is, the weight ratio of the shape retaining yarn is set to 1/10 or less of the weight of the reinforcing yarn, and this is set to the reinforcing yarn. By being entangled with each other, in combination with the arrangement of the reinforcing yarns described above, the reinforcing yarns at the time of expansion more easily move at an angle.
[0010]
The base material for inner surface molding of the present invention, as a reinforcing fiber base material, is arranged so that the arrangement direction of the reinforcing yarns of the unidirectional reinforcing fabric is an angle of 30 to 85 degrees with respect to the axial direction of the pipe line to be repaired. Because it is arranged, when this is made into a cylindrical object and inserted into a pipeline to be expanded, the force with which the yarns rub against each other at the intersection of the reinforcing yarn and the shape retaining yarn is normal plain woven fabric Much lower and easier to swell. That is, when the cylindrical object is inserted into an existing pipeline to be repaired, both ends of the cylindrical object are closed and pressure is applied to the inside thereof, the reinforcing yarn has an angle with respect to the axial direction of the pipeline. The angle is moved so as to increase, so that it expands in the circumferential direction, and the outer layer of the cylindrical object is in sufficient contact with the existing pipe line.
Therefore, the existing pipe line and the cylindrical object are integrated, and the reinforcing thread does not loosen even when the degree of expansion changes due to the fluctuation of the pipe inner diameter. This makes it possible to provide the required strength to the pipe line to be repaired and thereby suppress the occurrence of wrinkles after molding.
[0011]
In addition, it is necessary to have a laminated configuration in which unidirectional reinforcing fabrics and nonwoven fabrics that are easy to move between fibers during expansion are alternately arranged. With such a configuration , excellent expandability and reinforcing yarns similar to the above can be obtained. An action that does not sag is obtained, and a molded article with good inner surface smoothness can be formed by disposing a nonwoven fabric in the innermost layer. In addition, when the unidirectional reinforced fabric and non-woven fabric are laminated, the unidirectional strength direction characteristics of the unidirectional reinforced fabric and the stiffness of the non-woven fabric are combined, depending on the damage status in the existing pipe line to be repaired and the target repair strength. In addition, the thickness of the molded product can be made thinner than in the case of the nonwoven fabric alone, thereby reducing the reduction in the cross-sectional area of the pipeline after repair, and thus in the pipe Decrease in transport capacity can be prevented.
[0012]
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view schematically showing one embodiment of the present invention, in which a cylindrical inner surface forming base material 2 and a resin impregnated therein are cured in an existing pipe line 1 to be repaired. A new pipe line made of a molded product with a cured resin is formed. The inner surface forming base material 2 is formed in a cylindrical shape by laminating a unidirectional reinforced fabric 4, a nonwoven fabric 6, a unidirectional reinforced fabric 5 and a nonwoven fabric 7 in order from the outer layer. The reinforced yarn 4a of the unidirectional reinforced fabric 4 is arranged at a predetermined angle between 30 degrees and 85 degrees with respect to the axial direction of the pipe line 1, and the reinforced yarn 5a of the unidirectional reinforced fabric 5 is arranged in the unidirectional direction. It arrange | positions at the angle which becomes symmetrical with the reinforced yarn of the reinforced fabric 4 .
[0013]
The unidirectional reinforcing fabric constituting the inner surface forming base material uses, for example, glass roving as the reinforcing yarn, and uses, for example, polyester yarn as the shape maintaining yarn, and has a woven density of 5 pieces of the glass roving. / 25 mm, a woven fabric woven by entangled with the glass roving with a woven density of the polyester yarn of 0.5 × 2/25 mm, and the glass roving to such an extent that the polyester yarn can hold the woven structure of the woven fabric. It is also tangled in. Specific examples of the glass roving include trade name DWR1150F165 manufactured by Unitika Glass Fiber Co., Ltd., and examples of the polyester yarn include product name 250 / 48-E721 manufactured by Unitika Ltd.
[0014]
Next, as said nonwoven fabric, the glass chopped strand mat generally used, for example for resin reinforcement is used preferably, and the nonwoven fabric, felt, etc. which consist of other synthetic fibers etc. can also be used. Specific examples of the glass chopped strand mat include trade name EM450SS manufactured by Unitika Glass Fiber Co., Ltd.
[0015]
Examples of the reinforcing yarn include glass fibers, carbon fibers, aramid fibers, and the like, and these may be used in combination of two or more. Examples of the shape retention yarn include synthetic fibers such as polyester fibers, glass fibers, natural fibers, and the like.
An example of the method for producing the inner surface forming base material of the pipe line of the present invention will be described with reference to FIGS. As shown in FIG. 2, the Yokosuda fabric to be the unidirectional reinforcing fabric 3 is first woven in the same manner as a normal Yokosdale fabric. That is, warp yarn is to be the shape-maintaining yarn 3b, weft yarn is to be the reinforced yarn 3a, and two warp yarns made of polyester yarn are arranged at a rate of one place between 50 mm, and glass roving Glass roving which is composed of weft yarns composed of 5 yarns with a density of 25 mm and weaving as so-called leno weaves in which warp yarns are entangled with weft yarns, and the weight per 1 m ^{2 of} woven fabric should be, for example, reinforced yarn 3a The polyester yarn (thickness 250d) is 1 g with respect to 230 g.
[0016]
Next, tension is applied to the shape retaining yarn 3b of the Yokosudare woven fabric to form a reinforced yarn 4a having a woven yarn angle of 45 degrees as shown in FIG. As shown in FIG. 4, the unidirectional reinforcing fabric 4 and the nonwoven fabric 6 are stitched together using a polyester thread as a sewing thread 8. In addition, 4b in FIG. 3 is a form maintenance thread | yarn of the unidirectional reinforcement fabric 4. FIG.
[0017]
Further, a tension is applied to the shape holding yarn 3b of the Yokosdale woven fabric shown in FIG. 2, and the angle of the weft to be symmetric with the weft yarn of the Yokosdale woven fabric of FIG. 3, as shown in FIG. The unidirectional reinforcing fabric 5 is formed at −45 degrees, and then, as shown in FIG. 6, the unidirectional reinforcing fabric 5 and the nonwoven fabric 7 are stitched together with a polyester thread as a sewing thread 8. In addition, 5b in FIG. 4 is a form maintenance thread | yarn of the unidirectional reinforcement fabric 5. As shown in FIG.
[0018]
The thus obtained unidirectional reinforcing fabric 4 and the reinforcing fiber laminate thermosetting resin made of a nonwoven fabric 6 which, like the impregnated ultraviolet curable resin, the inner surface molding is molded into a circular cylinder-like material conduit A synthetic resin film is placed on the outermost layer of the cylindrical object. When the outermost layer is covered with a synthetic resin film, it can be easily inserted into an existing pipeline to be repaired due to its smoothness. The resin impregnation of the inner surface-shaped substrate may be performed after the inner surface forming substrate is inserted into the pipe.
[0019]
When Example 1 according to the present invention is compared with Comparative Examples 1 to 3, the fiber-reinforced resin laminate in Example 1 has a 44% higher bending strength than that of Comparative Examples 1 and 2, and Compared to this, the bending strength is 30% higher. This also shows that the base material for forming the inner surface of the pipe according to the present invention is suitable for repairing the pipe.
The bending strength was measured according to JIS-K-7055 “Bending test method for glass fiber reinforced plastic”. The measurement was performed with the uppermost layer of the fiber reinforced resin laminate as the upper surface.
[0020]
【The invention's effect】
According to the present invention, with the above-described configuration, the expandability after insertion into the pipeline is good, wrinkles are not generated after molding, and the strength of the pipeline in the circumferential direction is excellent.
[Brief description of the drawings]
FIG. 1 is a plan view schematically showing an inner surface forming base material in one embodiment of the present invention.
FIG. 2 is a plan view showing a manufacturing process of the inner surface forming base material.
FIG. 3 is a plan view showing a manufacturing process of the inner surface forming base material.
FIG. 4 is a plan view showing a manufacturing process of the inner surface forming base material.
FIG. 5 is a cross-sectional view showing a manufacturing process of the inner surface forming base material.
FIG. 6 is a cross-sectional view showing the manufacturing process of the inner surface forming base material.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pipe line 2 Base material for inner surface shaping | molding 3, 4, 5 Unidirectional reinforcement textiles 3a, 4a, 5a Reinforcement thread 3b, 4b, 5b Form retention thread 6, 7 Nonwoven fabric 8 Sewing thread

Claims (4)

An inner surface molding base material for repairing the inside of a pipe line composed of a fiber reinforced resin laminate obtained by impregnating a resin into a reinforcing fiber laminate obtained by laminating a plurality of reinforcing fiber substrates, A unidirectional reinforcing woven fabric and a non-woven fabric , which are formed by entanglement of a shape-retaining yarn with a reinforcing yarn composed of long fibers in which at least one layer is arranged in one direction, and the weight ratio of the reinforcing yarn to the shape-retaining yarn is 10 or more. The non-woven fabric is alternately laminated, and the nonwoven fabric is arranged in the innermost layer, and the arrangement direction of the reinforcing yarns of the unidirectional reinforcing fabric is at an angle of 30 degrees to 85 degrees with respect to the axial direction of the pipeline to be repaired. A base material for forming an inner surface of a pipe, which is arranged so as to become.   The base material for forming an inner surface of a pipe according to claim 1, wherein the unidirectional reinforcing fabric is woven using weft yarns as reinforcing yarns and warp yarns as shape retaining yarns.   The base material for forming an inner surface of a pipe line according to claim 1 or 2, wherein the reinforcing yarn of the unidirectional reinforcing fabric is made of at least one of glass fiber and carbon fiber.   The shape-retaining yarn of the unidirectional reinforcing fabric is made of at least one of glass fiber, synthetic fiber and natural fiber. Base material.

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