JP6975550B2 - Liner lining material - Google Patents

Description

The present invention relates to a lining material whose inner and outer surfaces are inverted and lined in a pipeline.

Conventionally, the following construction methods have been known as construction methods for repairing existing pipelines such as aging water and sewage pipes, agricultural water pipes, and gas pipes. A curable resin liquid is applied to the inner peripheral surface of a tubular lining material having an airtight layer on the outer peripheral surface, and the lining material is impregnated with the curable resin liquid. Then, the inner and outer surfaces of the lining material are inverted and laid in the pipeline to cure the curable resin liquid impregnated in the lining material.

For example, the lining material described in Patent Document 1 includes a first lining member having an airtight layer on the outer peripheral surface, and a tubular second lining member arranged inside the first lining member and containing high-strength fibers. The second lining member is formed by rolling a rectangular fiber sheet into a cylindrical shape, and has an overlapping portion in which both ends of the fiber sheet are overlapped. Alternatively, the second lining member has a slack portion or a folded portion in a state where the peripheral length is longer than that of the first lining member and the first lining member is arranged flat so as to be half the width of the peripheral length. ..

Conventionally, when applying and impregnating such a lining material with a curable resin liquid, an amount of the curable resin liquid required for impregnating the entire length of the lining material is applied to the inside of the lining material from one end of the lining material. The lining material was injected and sandwiched with a pinch roller or the like, and the curable resin liquid was uniformly impregnated over the entire length thereof.

Japanese Unexamined Patent Publication No. 2014-113732

However, in the case of a long lining material or a lining material having a large circumference, a large amount of curable resin liquid is injected at one time, so that a large work space is required for the injection work and the impregnation work. .. In addition, it was difficult to squeeze a large weight of the curable resin liquid with a pinch roller.

An object of the present invention is to provide a lining material capable of easily injecting a curable resin liquid into the lining material and impregnating the lining material in a relatively compact space.

The lining material for a pipeline of the first invention is a lining material whose inner and outer surfaces are inverted and lined in a pipeline, and is composed of a tubular fiber layer and a resin layer covering the outer peripheral surface of the fiber layer. A lining member and a tubular second lining member arranged inside the first lining member and containing at least high-strength fibers arranged in the circumferential direction thereof are provided, and the second lining member is the first lining member. In a state where the peripheral length is longer than that of the first lining member and the first lining member is arranged flat so as to be half the width of the peripheral length, a portion having an overlap portion in the circumferential direction or a slack portion is a slack portion. The first lining member has a folded portion, which is a portion or a folded portion, and the first lining member has a linear or curved shape into which an injection nozzle for injecting a curable resin liquid is inserted inside the second lining member. The second lining member has at least one first slit, and the second lining member has at least a linear or curved shape formed at a position where the injection nozzle inserted into the at least one first slit can be inserted. The second lining member having one second slit, in a portion of the second lining member where the at least one second slit is neither the overlap portion, the slack portion, nor the folded portion. It is characterized in that it is formed along the circumferential direction of.

When lining a pipeline with this lining material, first, an injection nozzle is inserted into the first slit of the first lining member and the second slit of the second lining member, and the injection nozzle is used to connect the second lining member. Inject a curable resin solution inside. After injecting the curable resin liquid, the first slit of the first lining member is covered with a highly airtight resin film. Further, after injecting the curable resin liquid, the fiber layers of the second lining member and the first lining member are impregnated with the curable resin liquid by a pinch roller or the like. After impregnating the curable resin liquid over the entire length of the lining material, the inner and outer surfaces of the lining material are inverted by, for example, air pressure. When the lining material is inverted, the first lining member is arranged inside the second lining member. When an internal pressure acts on the inverted first lining member during or after inversion, the expanded first lining member receives the internal pressure on the second lining member. When the second lining member has an overlapping portion, when an internal pressure is applied to the inverted second lining member, the ends constituting the overlapping portion slide with each other, and the diameter of the inverted second lining member is expanded. do. On the other hand, when the second lining member has a slack portion or a folded portion, when an internal pressure is applied to the inverted second lining member, the slack portion or the folded portion extends and the second lining member expands without slack. In either case, the curable resin liquid is cured with the inverted lining material in close contact with the inner surface of the pipeline.

When the number of the first slit and the second slit is each, the amount of the curable resin liquid required to impregnate the entire length of the lining material is divided into a plurality of slits (first slit). And the second slit) can be injected respectively. Therefore, the amount of the curable resin liquid to be injected at one time can be reduced as compared with the case where the entire amount is injected from one end of the lining material. On the other hand, when the number of the first slit and the number of the second slits is one, the lining is formed by injecting a curable resin solution on both sides of the slits (first slit and second slit) in the tubular axis direction. The amount of the curable resin liquid to be injected at one time can be reduced as compared with the case where the entire amount is injected from one end of the material. In either case, the curable resin liquid injected at one time may be impregnated only in a part of the entire length of the lining material in the axial direction. Therefore, the injection work and the impregnation work can be easily performed in a relatively compact space.

Further, the injection nozzle is characterized in that the curable resin liquid is arranged in a direction as close as possible to the tubular axis direction of the lining material so that the curable resin liquid can be discharged in the tubular axis direction of the lining material. Since the second slit is formed along the circumferential direction of the second lining member, the cylinder axis of the injection nozzle is compared with the case where the second slit is formed along the cylinder axis direction of the second lining member. It is easy to insert the injection nozzle so that the direction is the cylinder axis direction of the second lining material. Therefore, the injection work can be performed more easily.

The second slit of the second lining member is formed along the circumferential direction of the second lining member. Therefore, it is possible to carry out the injection work while avoiding breaking the high-strength fibers arranged in the circumferential direction of the second lining member. That is, it is possible to prevent the strength of the second lining member from decreasing in the circumferential direction. Further, after the lining material is inverted or when the lining material is inverted, a force for expanding or expanding the diameter of the second lining member (tensile force in the circumferential direction) is surely applied to any of the overlapping portion, the slack portion, and the folded portion. Can be done. In addition, it is possible to prevent the second slit from receiving a force in the opening direction. Therefore, it is possible to prevent the thickness of the lining material from being locally reduced after the curable resin liquid is cured, and it is possible to prevent the lining material in the lined state from being locally reduced in strength.

When the second slit is curved, "the second slit is formed along the circumferential direction of the second lining member" means a straight line connecting both ends of the second slit or the central portion of the second slit. It means that the tangent line is formed along the circumferential direction of the second lining member.
Further, in the present invention, "a state in which the peripheral length is longer than that of the first lining member and the first lining member is arranged in a flat shape so as to be half the width of the peripheral length" is defined as a flat first lining. Not only when the width of the material is exactly the same as half of the circumference, but also when the width of the flat first lining material is slightly shorter than half of the circumference depending on the flexibility of the first lining member. ..
Further, in the present invention, the overlapping portion of the second lining member means the overlapped portion when the second lining member is formed by overlapping both ends of the sheet in a tubular shape.

Further , in the first invention, the at least one second slit is formed in a portion of the second lining member that is neither the overlap portion, the slack portion, nor the folded portion. And.

The overlap, slack, and folded parts are thicker than the other parts. Therefore, when the second slit is a notch, it is easy to form the second slit by forming the second slit in a portion that is not any of the overlap portion, the slack portion, and the folded portion.

Conduit lining material of the second invention, in the first invention, the first lining member of the first slit in the peripheral portion and the second lining member and the second slit of the peripheral portion of the slack without flat top It is characterized in that the first slit and the second slit intersect or are separated from each other in a state of being overlapped with each other.

When the lining material is impregnated with the curable resin liquid, the inner peripheral surface of the first lining member (inner peripheral surface of the fiber layer) and the outer peripheral surface of the second lining member are in close contact with each other via the curable resin liquid. The first slit and the second slit intersect or intersect with each other in a state where the peripheral portion of the first slit of the first lining member and the peripheral portion of the second slit of the second lining member are overlapped in a flat manner without slack. ,is seperated. Therefore, in a state where the lining material is impregnated with the curable resin liquid, the peripheral portion of the first slit of the first lining member is in close contact with the second lining member via the curable resin liquid, and the first slit Almost the entire area is covered with the non-opened portion of the second lining member. Further, the peripheral portion of the second slit of the second lining member is in close contact with the first lining member via the curable resin liquid, and almost the entire area of the second slit is a portion where the first lining member is not opened. It is covered with. The curable resin liquid is relatively highly viscous so that the impregnated state of the lining material can be maintained. Therefore, even if a force is applied to the lining material when the lining material is inverted, the peripheral portion of the first slit via the curable resin liquid and the second lining member are in close contact with each other, and the curable resin liquid is used for the first. It is possible to maintain a close contact state between the peripheral portion of the two slits and the first lining member. Therefore, it is possible to suppress the application of a force in the opening direction to the first slit and the second slit, and it is difficult for the first slit and the second slit to open.

When the curable resin liquid is thermosetting, the lining material in the inverted state is heated while applying internal pressure in order to shorten the curing time of the curable resin liquid. At this time, as described above, since the first slit and the second slit are difficult to open, even if the resin film covering the first slit is softened by heat, the resin film expands so as to enter the inside of the first slit. Can be prevented from doing so. Therefore, it is possible to prevent the thickness of the lining material from being locally reduced after the curable resin liquid is cured, and it is possible to prevent the local strength of the lining material in the lined state from being lowered.
Further, when the curable resin liquid is cured at room temperature, the thickness of the lining material after the curable resin liquid is cured does not become locally thin. As described above, since the first slit and the second slit are difficult to open, it is possible to prevent a local decrease in strength of the lining material in the lined state.

The pipeline lining material of the third invention is characterized in that, in the second invention, the at least one first slit is inclined with respect to the tubular axis direction of the first lining member.

According to this configuration, as compared with the case where the first slit is formed along the tubular axis direction of the first lining member, the direction in which the first slit acting on the first slit is opened during or after the lining material is inverted. Power can be reduced. Therefore, it is possible to more reliably prevent the thickness of the lining material from being locally reduced after the curable resin liquid is cured, and it is possible to more reliably prevent the local strength of the lining material in the lined state from being reduced.

When the first slit is curved, "the first slit is inclined with respect to the tubular axis direction of the first lining member" means a straight line connecting both ends of the first slit or the central portion of the first slit. It means that the tangent line of the first lining member is inclined with respect to the cylinder axis direction of the first lining member.

The lining material for the pipeline of the fourth invention is, in any one of the first to third inventions, the second lining member is a woven fabric in which the high-strength fibers are arranged at least in the circumferential direction of the second lining member. It is characterized by including.

According to this configuration, since the second lining member is a woven fabric, the orientation direction of the fibers constituting the second lining member is not one direction. Therefore, the strength of the second lining member can be ensured not only in the circumferential direction but also in the tubular axial direction.
Further, since the second lining member is a woven fabric, the fibers constituting the second lining member are continuous rather than short fibers. That is, the second lining member contains high-strength fibers that are continuous in the circumferential direction. Therefore, it is possible to prevent the second slit formed along the circumferential direction from propagating in the tubular axis direction.

In any one of the first to fourth inventions, the pipeline lining material of the fifth invention has the overlap portion, and the overlap portion is formed by a hot melt adhesive. It is characterized by being temporarily joined.

According to this configuration, since the overlapping portions are temporarily joined by the hot melt adhesive, it is possible to prevent the ends constituting the overlapping portions from sliding when the lining material is inverted. Further, by heating the lining material while applying an internal pressure to the lining material after inversion, the hot melt adhesive is softened and the joining of the overlapped portion is released. As a result, the diameter of the second lining member can be expanded.

The pipeline lining material of the sixth invention is characterized in that, in any one of the first to fifth inventions, the at least one first slit and the at least one second slit are notches.

According to this configuration, the first slit and the second slit can be easily formed.

According to the present invention, the work of injecting the curable resin liquid into the lining material and the work of impregnating the lining material can be easily performed in a relatively compact space.

It is sectional drawing of the lining material which concerns on embodiment of this invention. It is a perspective view of the 2nd lining member of FIG. It is a partial cross-sectional view of the 2nd lining member of FIG. It is a partial plan view of the lining material with the injection nozzle inserted inside. It is a partial plan view of the lining material in the state where the first slit is sewn. It is a partial plan view of the lining material in the state where the first slit and the suture are covered with the slit covering resin film. It is sectional drawing which shows the state which the inner and outer surfaces of a lining material were inverted and inserted into a pipeline. (A) is a cross-sectional view showing a state before the lining material is inverted, (b) is a cross-sectional view showing a state where the lining material has started to be inverted, and (c) is a sectional view showing a state where the lining material is being inverted. It is sectional drawing which shows the state. It is the figure which looked at the tip part in the traveling direction of the lining material being inverted from the front in the traveling direction. It is sectional drawing of the state which the lining material is lined in a pipeline. It is a partial plan view of the lining material which concerns on the modification of this invention. It is sectional drawing of the lining material which concerns on the modification of this invention. 12 (a) to 12 (c) are cross-sectional views showing a state in which the inner and outer surfaces of the lining material of FIGS. 12 (a) and 12 (c) are inverted and inserted into a pipeline.

Hereinafter, embodiments of the present invention will be described. FIG. 1 is a cross-sectional perspective view of the lining material 1 according to the present embodiment. The lining material 1 of the present embodiment is used for repairing existing pipelines such as water and sewage pipes. The lining material 1 is lined in a pipeline by inverting the inner and outer surfaces.

First, the structure of the lining material 1 will be described. The lining material 1 has a cylindrical first lining member 10 and a tubular second lining member 20 arranged inside the first lining member 10.

The first lining member 10 is composed of a tubular fiber layer 11 and a resin layer 12 that covers the entire outer peripheral surface of the fiber layer 11. The fiber layer 11 is a woven fabric woven from, for example, polyester fibers. The fiber layer 11 may be a seamless tubular woven fabric having no sewn portion along the axial direction, or may be a tubular woven fabric having a sewn portion along the axial direction. Further, the fiber layer 11 may be a non-woven fabric such as polyester fiber. The resin layer 12 is selected from thermoplastic resins such as polyethylene, polypropylene, nylon and polyester. The resin layer 12 is in close contact with the fiber layer 11 and has airtightness (impermeableness) through which gases and liquids do not pass.

The first lining member 10 has a plurality of linear first slits 13. The plurality of first slits 13 are arranged in the tubular axis direction of the first lining member 10. The plurality of first slits 13 are preferably formed at equal intervals, and the intervals are determined by the injection amount of the curable resin liquid described later. The first slit 13 is inclined with respect to the cylinder axis direction of the first lining member 10. The inclination angle of the first lining member 10 of the first slit 13 with respect to the cylinder axis direction is preferably 25 ° or more and 65 ° or less, more preferably 45 °, because the stress acting by the pressure at the time of lining acts in the 0 ° and 90 ° directions. preferable. The inclination angle of the first lining member 10 of the first slit 13 with respect to the cylinder axis direction means the smaller angle between the straight line along the first slit 13 and the straight line parallel to the cylinder axis direction. .. In this embodiment, this tilt angle is 45 °. The length of the first slit 13 in the circumferential direction of the first lining member 10 may be shorter than half of the peripheral length of the first lining member 10 as long as the injection nozzle 30 described later can be inserted. The first slit 13 is a notch. That is, the first slit 13 is formed by partially cutting the first lining member 10. Therefore, it is easy to form the first slit 13.

The second lining member 20 is made of a rectangular fiber sheet 21. The second lining member 20 is formed by overlapping both ends of the fiber sheet 21 into a cylindrical shape. The portion where both ends of the fiber sheet 21 are overlapped is referred to as an overlap portion 22. That is, the overlap portion 22 is formed in a part of the second lining member 20 in the circumferential direction. The overlap portion 22 is formed along the tubular axis direction over the entire length of the second lining member 20 in the tubular axis direction.

As shown in FIG. 2, the overlap portion 22 is temporarily joined by, for example, a hot melt adhesive 23. That is, the overlapped both ends of the fiber sheet 21 are temporarily joined by the hot melt adhesive 23. More specifically, the hot melt adhesive 23 is applied to one end of the fiber sheet 21 and the one end and the other end are overlapped to bond the two. The hot melt adhesive 23 is not applied to the entire area of the overlap portion 22, but is applied only to a plurality of line-shaped regions (two in FIG. 2) parallel to the tubular axis direction. The joining strength of the overlapping portion 22 is sufficient to be sufficient to temporarily fix the lining material 1 so as not to shift when the lining material 1 is inverted in the pipeline P. Then, as will be described later, the hot melt adhesive 23 is softened by heating in the resin curing step after the lining material 1 is installed in the pipeline P, and the bonding of the overlap portion 22 is released.

The peripheral length of the second lining member 20 in the cylindrical form is shorter than the peripheral length of the first lining member 10. As shown in FIG. 1, in a state where the first lining member 10 is arranged flat so as to have a width of half of its peripheral length, the second lining member 20 is in a state where there is no slack or folding back, and the first lining member 20 is lining. It can be arranged inside the member 10.

The fiber sheet 21 constituting the second lining member 20 contains glass fiber (high-strength fiber). The fiber sheet 21 contains glass fibers arranged along the circumferential direction of the second lining member 20. Further, the fiber sheet 21 preferably contains glass fibers arranged along the tubular axis direction of the second lining member 20. As shown in FIG. 3, in the second lining member 20 (fiber sheet 21), a non-woven fabric 24 of organic fibers such as polyester (for example, a spunbonded non-woven fabric) and a glass roving cloth 25 woven by glass roving are alternately arranged. It has a structure in which it is laminated and joined by a needle punch. The glass roving is made by aligning glass fibers, is arranged along the circumferential direction of the cylindrical second lining member 20, and is a main strength member against external pressure after lining. Both sides of the fiber sheet 21 are made of a non-woven fabric 24. At least one surface of the fiber sheet 21 may be made of a glass roving cloth 25.

The second lining member 20 has a plurality of linear second slits 26. The plurality of second slits 26 are arranged in the tubular axis direction of the second lining member 20. The plurality of second slits 26 are provided in the vicinity of the plurality of first slits 13 of the first lining member 10, respectively. The second slit 26 is formed along the circumferential direction of the second lining member 20. The length of the second slit 26 in the circumferential direction of the second lining member 20 may be shorter than half of the peripheral length of the second lining member 20 as long as the injection nozzle 30 described later can be inserted. The second slit 26 is a notch. That is, the second slit 26 is formed by partially cutting the second lining member 20. Therefore, it is easy to form the second slit 26. The second slit 26 is formed in a portion other than the overlap portion 22. As a result, the second slit 26 is more likely to be formed.

The first slit 13 of the first lining member 10 and the second slit 26 of the second lining member 20 have an injection nozzle 30 (see FIG. 4) for injecting a thermosetting resin liquid into the inside of the second lining member 20. It is formed so that it can be inserted. That is, the second slit 26 of the second lining member 20 is formed at a position where the injection nozzle 30 inserted into the first slit 13 can be inserted. As shown in FIG. 1, in a state where the peripheral portion of the first slit 13 of the first lining member 10 and the peripheral portion of the second slit 26 of the second lining member 20 are overlapped flatly without slack, the first slit 13 and the peripheral portion are overlapped with each other. The second slit 26 intersects.

Next, a method of repairing the existing pipeline P using the above-mentioned lining material 1 will be described.
First, a thermosetting resin liquid is injected into the inside of the lining material 1 and the injected thermosetting resin liquid is impregnated into the fiber layer 11 and the second lining member 20 of the first lining member 10 (resin injection / impregnation). Process). After that, compressed air is applied to the lining material 1 impregnated with the thermosetting resin liquid to invert the inner and outer surfaces thereof, and the lining material 1 is installed in the pipeline (reversal installation step). Next, by heating and pressurizing the lining material 1 in the inverted state from the inside, the diameter of the second lining member 20 is expanded and the thermosetting resin liquid impregnated in the lining material 1 is cured (resin curing). Process). Hereinafter, each step will be described in detail.

(Resin injection / impregnation process)
As shown in FIG. 4, the injection nozzle 30 is inserted into the first slit 13 and the second slit 26, and the thermosetting resin liquid is injected inside the second lining member 20. The injection nozzle 30 is arranged so that the axial direction of the injection nozzle 30 is substantially parallel to the axial direction of the lining material 1 so that the thermosetting resin liquid can be discharged in the axial direction of the lining material 1. The thermosetting resin liquid is injected once into one first slit 13. The injection amount of the thermosetting resin liquid at this time is preferably corresponding to the length at which the lining material 1 can be extended to the work table which is the work space for injection and impregnation. The thermosetting resin liquid may be injected twice into one first slit 13 by changing the insertion direction of the injection nozzle 30. That is, even if the first injection is performed on one side of the lining material 1 of the first slit 13 in the tubular axis direction and the second injection is performed on the other side of the lining material 1 of the same first slit 13 in the tubular axis direction. good.

After injecting the thermosetting resin liquid, the first slit 13 is sewn with the suture thread 14 as shown in FIG. The stitching shall be continuous stitching. More specifically, the sutures 14 are alternately and continuously arranged in a direction closer to the tubular axis direction than the circumferential direction of the lining material 1 and a direction closer to the circumferential direction than the tubular axial direction of the lining material 1. As described above, the first slit 13 is sutured.

After suturing, as shown in FIG. 6, the slit-covered resin film 15 is adhered to the resin layer 12 of the first lining member 10 so as to cover the first slit 13 and the suture thread 14. The slit-coated resin film 15 is made of a thermoplastic resin. The slit-coated resin film 15 is formed, for example, by linearly placing the molten thermoplastic resin on the first slit 13 and the suture 14, and then pressing the thermoplastic resin with a roller. The thermoplastic resin forming the slit-coated resin film 15 is preferably the same resin as the resin layer 12 of the first lining member 10.

Further, after injecting the thermosetting resin liquid, the region corresponding to the injection amount of the fiber layer 11 and the second lining member 20 of the first lining member 10 is impregnated with the thermosetting resin liquid. As a method of impregnating the resin liquid, a general method may be used in which the lining material 1 in which the thermosetting resin liquid is injected is sandwiched between pinch rollers and the like and squeezed. Further, from the viewpoint of uniformly impregnating the resin with the lining material 1, it is preferable to adopt the following method. That is, after injecting the thermosetting resin liquid, the region to be impregnated is arranged so that the cylinder axis direction is substantially vertical, and the resin is uniformly applied to the region to be impregnated while the excess resin liquid is dropped by gravity. Impregnate with liquid.

Similarly, the thermosetting resin liquid is also injected from the other first slit 13 and the second slit 26 to impregnate the lining material 1. By repeating this operation, the thermosetting resin liquid is injected from all the first slits 13 and the second slit 26, and the entire area of the lining material 1 is impregnated with the thermosetting resin liquid. This resin injection / impregnation step can be continuously performed while winding the lining material 1 on a reel or the like. Therefore, it is possible to easily inject and impregnate the curable resin liquid into the long lining material 1. Further, if the number of injection ports (first slit 13 and second slit 26) is increased with respect to the lining material 1 having a certain length, that is, if the thermosetting resin liquid is injected many times, the lining material 1 is temporarily used. The work space to be placed can be made compact. The step of forming the first slit 13 and the second slit 26 and the resin injection / impregnation step may be continuously performed while winding the lining material 1 on a reel or the like. Further, as in the conventional case, a fixed amount of the curable resin liquid is injected from one end of the lining material 1, and the curable resin liquid is injected from a plurality of injection ports (first slit 13 and second slit 26) of the lining material 1. You may.

Here, a case where the resin injection / impregnation step is performed after all the plurality of injection ports (first slit 13 and second slit 26) are formed has been described, but the injection ports (first slit 13 and second slit 26) have been described. ) Is not limited to this. One injection port (first slit 13 and second slit 26) is formed, a resin liquid is injected from there, the first slit 13 is covered with the slit-coated resin film 15, and then another injection port is formed. Then, the resin liquid may be injected. Further, after injecting the resin liquid from one injection port and before forming the slit-coated resin film 15, the next (adjacent) injection port may be formed and the resin liquid may be injected. In that case, it is desirable that the injection ports other than one injection port (specifically, the first slit 13) are squeezed so that the pressure can be reduced. The inlets (first slit 13 and second slit 26) can be arbitrarily added. The injection port can be formed by temporarily stopping the resin liquid on the front side of the portion where the injection port (first slit 13 and second slit 26) is desired to be formed by a nip or the like.

It should be noted that any of the following three methods may be adopted for impregnating the region where the injection port (first slit 13 and second slit 26) is formed with the resin liquid. In the following three methods, a part of the lining material 1 is arranged so that the cylinder axis direction is in the vertical direction, and then impregnated. In either method, the resin liquid is previously injected downward from the injection port above the target injection port (hereinafter referred to as the target injection port), and the region above the target injection port is impregnated with the resin liquid. There is.
In the first method, the resin liquid injected upward from the target injection port is stored in the upper vicinity of the target injection port. Before or after that, the resin liquid is injected downward from the target injection port, and the region below the target injection port is impregnated with the resin liquid. After completing the slit covering step and the air suction hole covering step of the target injection port, the resin liquid accumulated in the upper vicinity of the target injection port is moved downward to impregnate the region where the target injection port is formed with the resin liquid. Let me.
In the second method, the resin liquid injected from the injection port above the target injection port is impregnated into the area above the target injection port, and a part of the resin liquid is stored in front of the target injection port (near the upper part). back. Then, the resin liquid is injected downward from the target injection port, and the region below the target injection port is impregnated with the resin liquid. After completing the slit covering step and the air suction hole covering step of the target injection port, the resin liquid accumulated in the upper vicinity of the target injection port is moved downward to impregnate the region where the target injection port is formed with the resin liquid. Let me.
In the third method, the resin liquid is injected downward from the target injection port to impregnate the region below the target injection port with the resin liquid, and a part of the resin liquid is stored in the vicinity of the lower part of the target injection port. After completing the slit covering step and the air suction hole covering step of the target injection port, the resin liquid accumulated in the lower vicinity of the target injection port is moved upward to impregnate the region where the target injection port is formed with the resin liquid. Let me.

(Reversing installation process)
As shown in FIG. 7, the pipeline P is continuous with the shaft Q open to the ground, and the lining material 1 is installed in the shaft P from the shaft Q. As shown in FIG. 8A, the lining material 1 impregnated with the thermosetting resin liquid is wound on a reel 42 of a reversing machine 41 provided on a track 40 on the ground (see FIG. 7). Further, the tip of the lining material 1 is annularly fixed to the base 43 of the reversing machine 41.

As shown in FIG. 8B, when compressed air is introduced into the reversing machine 41, air pressure acts on the folded portion of the lining material 1 fixed to the base 43. Since the resin layer 12 of the first lining member 10 has airtightness, the folded portion of the lining material 1 advances in the traveling direction (right direction in the figure) due to the action of air pressure, and the lining material 1 is inverted. Begin to. At this time, the lining material 1 advances while being pulled out from the reel 42. FIG. 9 is a view of the tip end portion of the lining material 1 being inverted in the traveling direction as viewed from the front in the traveling direction. As shown in FIG. 8 (c), the lining material 1 continues to invert continuously while further advancing in the traveling direction. Then, as shown in FIG. 7, the lining material 1 in the inverted state is arranged in the pipeline P. Finally, the lining material 1 is installed in the pipeline P with its inner and outer surfaces inverted over its entire length. Since the overlapping portion 22 of the second lining member 20 is temporarily joined by the hot melt adhesive 23, it is possible to prevent both ends of the fiber sheet 21 from sliding when the lining material 1 is inverted. In the inverted state, the first lining member 10 having a circumference shorter than that of the second lining member 20 is arranged inside the second lining member 20. Therefore, the first lining member 10 is in a slackened state even when air pressure acts on the inside. This method is useful for suppressing wrinkles of the lining material generated in the curved pipe portion, particularly when the curved pipe is arranged in the pipeline P.

(Resin curing process)
A heating medium such as heated air or steam is supplied to the inside of the lining material 1 installed in the pipeline P in an inverted state, and the lining material 1 is subjected to the curing temperature of the thermosetting resin liquid (for example, 80 to 100). The lining material 1 is pressurized from the inside while heating above ° C.).

The heat of the heating medium softens the hot melt adhesive 23 that temporarily joins the overlap portion 22, and the joining is released. Further, in the state after the reversing installation step, the first lining member 10 having airtightness is arranged inside the second lining member 20, so that the heating medium is supplied to the inside of the first lining member 10. The first lining member 10 expands from the loosened state, and the second lining member 20 is pressed from the inside. As a result, the ends constituting the overlap portion 22 (that is, both ends of the fiber sheet 21) slide in the circumferential direction, and the diameter of the second lining member 20 is expanded (that is, the peripheral length is increased). Then, as shown in FIG. 10, the lining material 1 is pressed against the inner surface of the pipeline P and adheres to the inner surface, and the thermosetting resin liquid is thermally cured in that state. As a result, the lining material 1 is lined with the pipeline P. In FIG. 10, the overlapping portions of both ends of the fiber sheet 21 are enlarged and displayed. In the resin curing step, the peripheral length of the first lining member 10 is increased by several% to 10%.

Although the present embodiment has been described above, the lining material 1 of the present embodiment has the following effects.
When the lining material 1 is inverted, the first lining member 10 is arranged inside the second lining member 20. When an internal pressure acts on the inverted first lining member 10 during or after inversion, the expanded first lining member 10 receives the internal pressure on the second lining member 20. When an internal pressure is applied to the inverted second lining member 20, the ends constituting the overlap portion 22 slide with each other, and the diameter of the inverted second lining member 20 expands.

The lining material 1 is provided with a plurality of first slits 13 and a plurality of second slits 26. Therefore, the amount of the thermosetting resin liquid required to impregnate the entire length of the lining material 1 may be divided into a plurality of portions and injected from the plurality of slits (first slit 13 and second slit 26), respectively. Therefore, the amount of the thermosetting resin liquid to be injected at one time can be reduced as compared with the case where the entire amount is injected from one end of the lining material 1. The thermosetting resin liquid injected at one time may be impregnated only in a part of the entire length of the lining material 1 in the tubular axis direction. Therefore, the injection work and the impregnation work can be easily performed in a relatively compact space.

Further, the injection nozzle 30 may be arranged so that the cylinder axis direction of the injection nozzle 30 is as close as possible to the cylinder axis direction of the lining material 1 so that the thermosetting resin liquid can be discharged in the cylinder axis direction of the lining material 1. preferable. Since the second slit 26 is formed along the circumferential direction of the second lining member 20, the injection is performed as compared with the case where the second slit 26 is formed along the tubular axis direction of the second lining member 20. It is easy to insert the injection nozzle 30 so that the tubular axis direction of the nozzle 30 is the tubular axis direction of the second lining material 1. Therefore, the injection work can be performed more easily.

The second slit 26 of the second lining member 20 is formed along the circumferential direction of the second lining member 20. Therefore, it is possible to carry out the injection operation while avoiding cutting the high-strength fibers (glass fibers) arranged in the circumferential direction of the second lining member 20. That is, it is possible to prevent the strength of the second lining member 20 from decreasing in the circumferential direction. Further, a force (tensile force in the circumferential direction) that expands or expands the diameter of the second lining member 20 can be reliably applied to the overlapping portion 22 after or during the inversion of the lining material 1. In addition, it is possible to prevent the second slit 26 from receiving a force in the opening direction. Therefore, it is possible to prevent the thickness of the lining material 1 from being locally reduced after the thermosetting resin liquid is cured, and it is possible to prevent the lining material 1 in the lined state from being locally reduced in strength.

In a state where the lining material 1 is impregnated with the thermosetting resin liquid, the inner peripheral surface of the first lining member 10 (inner peripheral surface of the fiber layer 11) and the outer peripheral surface of the second lining member 20 are the thermosetting resin liquid. Adhere through. The first slit 13 and the second slit 26 intersect with each other in a state where the peripheral portion of the first slit 13 of the first lining member 10 and the peripheral portion of the second slit 26 of the second lining member 20 are overlapped flatly without slack. do. Therefore, in a state where the lining material 1 is impregnated with the thermosetting resin liquid, the peripheral portion of the first slit 13 of the first lining member 10 is in close contact with the second lining member 20 via the thermosetting resin liquid. Moreover, almost the entire area of the first slit 13 is covered with the unopened portion of the second lining member 20. Further, the peripheral portion of the second slit 26 of the second lining member 20 is in close contact with the first lining member 10 via the thermosetting resin liquid, and almost the entire area of the second slit 26 is the first lining member 10. It is covered with the unopened part of. As the thermosetting resin liquid, one having a relatively high viscosity (500 to 15000 cps) is used so that the impregnated state in the lining material 1 can be maintained. Therefore, even if a force is applied to the lining material 1 when the lining material 1 is inverted, the peripheral portion of the first slit 13 and the second lining member 20 are in close contact with each other via the thermosetting resin liquid, and the thermosetting material 1 is heat-curable. It is possible to maintain a close contact state between the peripheral portion of the second slit 26 and the first lining member 10 via the resin liquid. Therefore, it is possible to suppress the application of a force in the opening direction to the first slit 13 and the second slit 26, and it is difficult for the first slit 13 and the second slit 26 to open.

In order to shorten the curing time of the thermosetting resin liquid, the lining material 1 in the inverted state is heated while applying an internal pressure. At this time, as described above, since the first slit 13 and the second slit 26 are difficult to open, even if the resin film 15 covering the first slit 13 is softened by heat, the resin film 15 is the first slit 13. It is possible to prevent it from expanding so as to enter the inside. Therefore, it is possible to prevent the thickness of the lining material 1 from being locally reduced after the thermosetting resin liquid is cured, and it is possible to prevent the lining material 1 in the lined state from being locally reduced in strength.

The first slit 13 of the first lining member 10 is inclined with respect to the cylinder axis direction of the first lining member 10. Therefore, as compared with the case where the first slit 13 is formed along the tubular axis direction of the first lining member 10, the first slit 13 that acts on the first slit 13 is formed during or after the lining material 1 is inverted. The force in the opening direction can be reduced. More specifically, the force acting on the lining material 1 to which the internal pressure is applied is 2 in the circumferential direction when the cylinder axis direction is 1 (thin-walled cylindrical type). Therefore, it is difficult to open the first slit 13 by inclining it with respect to a force in the circumferential direction having a large action. Therefore, it is possible to more reliably prevent the thickness of the lining material 1 from being locally reduced after the thermosetting resin liquid is cured, and it is possible to more reliably reduce the local strength of the lining material 1 in the lined state. Can be prevented.

Since the second lining member 20 is a woven fabric, the orientation direction of the fibers constituting the second lining member 20 is not unidirectional. Therefore, the strength of the second lining member 20 can be ensured not only in the circumferential direction but also in the tubular axial direction.
Further, since the second lining member 20 is a woven fabric, the fibers constituting the second lining member 20 are continuous rather than short fibers. That is, the second lining member 20 includes high-strength fibers (glass fibers) continuous in the circumferential direction. Therefore, it is possible to prevent the second slit 26 formed along the circumferential direction from propagating in the tubular axis direction.

Although the preferred embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and various modifications can be made as long as it is described in the claims. The modification examples described later may be implemented in combination as appropriate.

1] The structure of the second lining member of the present invention is not limited to the structure shown in FIG. Further, the glass roving cloth 25 and the non-woven fabric 24 may not be alternately laminated. For example, the nonwoven fabric 24 may be laminated only on both sides of a plurality of glass roving cloths 25. Further, the non-woven fabric 24 may not be provided at all. Further, instead of the glass roving cloth 25, a glass cloth woven with glass yarn in which glass fibers are twisted may be used.
The second lining member of the present invention may contain high-strength fibers other than glass fibers (for example, aramid fiber, high-strength polyethylene fiber, high-strength polyarylate fiber, etc.). The second lining member of the present invention may be an SMC (sheet molding compound) in which short fibers of high-strength fibers such as glass fibers are dispersed in a thermosetting resin.
The second lining member of the present invention preferably contains a woven fabric containing high-strength fibers. Further, the second lining member preferably contains at least glass fibers arranged along the circumferential direction of the second lining member. The second lining member may include glass fibers arranged along the tubular axis direction of the second lining member.

2] In the above embodiment, the peripheral portion of the first slit 13 of the first lining member 10 and the peripheral portion of the second slit 26 of the second lining member 20 are overlapped with the first slit 13 in a flat state without slack. The first slit 13 and the second slit 26 are formed so that the second slit 26 intersects (see FIG. 1). However, as in the lining material 101 shown in FIG. 11A, for example, the peripheral portion of the first slit 13 of the first lining member 10 and the peripheral portion of the second slit 126 of the second lining member 20 are flattened without slack. The first slit 13 and the second slit 126 may be formed so that the first slit 13 and the second slit 126 are separated from each other in the stacked state. In this case, when the lining material 1 is impregnated with the thermosetting resin liquid, the peripheral portion of the first slit 13 of the first lining member 10 is in close contact with the second lining member 20 via the thermosetting resin liquid. Moreover, the entire area of the first slit 13 is covered with the unopened portion of the second lining member 20. Further, the peripheral portion of the second slit 126 of the second lining member 20 is in close contact with the first lining member 10 via the thermosetting resin liquid, and the entire area of the second slit 126 is the first lining member 10. It is covered with a part that is not open. Therefore, even if a force is applied to the lining material 1 when the lining material 1 is inverted, the peripheral portion of the first slit 13 and the second lining member 20 are in close contact with each other via the thermosetting resin liquid, and the thermosetting material 1 is heat-curable. The state of close contact between the peripheral portion of the second slit 126 and the first lining member 10 via the resin liquid can be maintained more firmly than in the above embodiment. Therefore, it is possible to suppress the application of a force in the opening direction to the first slit 13 and the second slit 126, and it is difficult for the first slit 13 and the second slit 126 to open. However, it is preferable that the first slit 13 and the second slit 126 intersect with each other in that the injection nozzle 30 can be easily inserted.

3] The first slit 13 of the above embodiment is inclined with respect to the cylinder axis direction of the first lining member 10. However, the first slit of the present invention may be formed along the tubular axis direction of the first lining member, or may be formed along the circumferential direction of the first lining member. However, in a state where the peripheral portion of the first slit of the first lining member and the peripheral portion of the second slit of the second lining member are overlapped flatly without slack, the first slit and the second slit intersect or or It is preferable that the first slit and the second slit are formed so as to be separated from each other. The first slit and the second slit may be formed at a position where they completely overlap each other.

4] A plurality of first slits 13 and second slits 26 of the above embodiment are provided. However, the number of the first slit and the second slit of the present invention may be one, respectively. In this case, the thermosetting resin liquid is injected into one side or both sides of the slits (first slit and second slit) in the tubular axis direction. As a result, the amount of thermosetting resin liquid that collects around the slits of the lining material can be reduced compared to the case where the entire amount is injected from one end of the lining material, and the injection work and impregnation work become easier, resulting in a relatively compact space. Can be easily done with.

5] The first slit 13 and the second slit 26 of the above embodiment are linear. However, the first slit of the present invention may be curved. Further, the second slit of the present invention may be curved.

6] In the above embodiment, the first slit 13 is sutured with a suture thread 14 and then covered with a slit-covered resin film 15. However, the first slit 13 may be covered with the slit covering resin film 15 without suturing. Further, the first slit 13 may be joined by a method other than stitching.

7] In the above embodiment, the overlapping portion 22 of the second lining member 20 is joined by the hot melt adhesive 23, but it may be joined by another method, for example, sewing. However, in the case of joining by sewing, it is necessary to make a relatively weak joining so that the sewn portion breaks when an internal pressure is applied to the second lining member 20 in the resin curing step. Further, the second lining member 20 is greatly expanded when the lining material 1 is installed in the pipeline because the frictional force acting between the ends of the fiber sheets 21 constituting the overlap portion 22 is large. If there is no risk, the overlap portion 22 may not be joined.

8] When the overlap portion 22 is not joined or the joining strength is weak, both ends of the fiber sheet 21 slide at the same time as the lining material 1 is inverted in the above-mentioned inversion installation step, and the second lining member 20 is formed. The diameter may be increased and the lining material 1 may be brought into close contact with the inner surface of the pipeline. In this case, it is possible to block the infiltration of water between the pipe line P and the lining material 1, which causes insufficient heating of the thermosetting resin and cause uncuring, and the lining material advances the accumulated water inside the pipe line P. Can be pushed forward in the direction.

9] The second lining member 20 of the above embodiment has an overlapping portion and has a shorter peripheral length than the first lining member 10, but is not limited to this configuration.

For example, as in the lining material 301 shown in FIG. 12A, the circumference of the second lining member 320 is longer than the circumference of the first lining member 10, and the width of the first lining member 10 is half the circumference. The second lining member 320 may have a slackened portion 327 which is a slackened portion in a state where the second lining member 320 is arranged so as to be flat. The slack portion 327 is formed only in a part of the second lining member 320 in the circumferential direction. The slack portion 327 is formed along the tubular axial direction of the second lining member 320. The second slit 26 is formed in a portion of the second lining member 320 other than the slack portion 327. As a result, the second slit 26 is likely to be formed. In FIG. 12A, the slack portion 327 faces the second slit 26, but it does not have to face the second slit 26. The second slit may be formed at a position diagonally opposite to the slack portion, or the slack portion and the second slit may be formed on the same plane.

Further, for example, as in the lining materials 401 and 501 shown in FIGS. 12 (b) and 12 (c), the peripheral length of the second lining member 420 and 520 is longer than the peripheral length of the first lining member 10, and the first lining member 10. Even if the second lining member 420, 520 has a folded portion 427, 527, 528, which is a folded portion, in a state where the lining member 10 is arranged flat so as to have a width of half of its peripheral length. good. The folded portions 427, 527, and 528 are formed along the tubular axial direction of the second lining member 20. The second lining member 420 shown in FIG. 12B has a folded-back portion 427 on one side in the width direction thereof. The second lining member 520 shown in FIG. 12 (c) has folded portions 527 and 528 on both sides in the width direction thereof. In FIGS. 12 (b) and 12 (c), the folded portions 427, 527, and 528 are folded upward in the figure, but may be folded downward. The second slit 26 is formed in a portion of the second lining member 420, 520 other than the folded portions 427, 527, and 528. As a result, the second slit 26 is likely to be formed. Further, it is preferable that the second slit 26 is formed in a portion of the second lining member 420, 520 other than the portion overlapping the folded portion 427, 527, 528.

The circumference of the second lining members 320, 420, 520 having such a slack portion 327 or a folded portion 427, 527, 528 cannot be expected to stretch when the high-strength fibers are arranged in the circumferential direction. The circumference is set so that it can be in close contact with the inner surface of the. Further, the peripheral length of the first lining member 10 is set to a peripheral length that can be brought into close contact with the inner peripheral surfaces of the second lining members 320, 420, 520. When the inverted second lining member 20 is subjected to internal pressure when the lining materials 301, 401, and 501 are inverted, the slack portion 327 or the folded portion 427, 527, 528 is eliminated, and the second lining member 20 is slackened. Inflate without. Then, as shown in FIG. 13, the inverted lining materials 301, 401, and 501 are in close contact with the inner surface of the pipeline P. After that, in the resin curing step, when a heating medium is supplied to the inside of the inverted lining materials 301, 401, 501 and heated while pressurizing from the inside, the lining materials 301, 401, 501 are in close contact with the inner surface of the pipeline. The thermosetting resin liquid cures. As described above, the second lining members 320, 420, and 520 having the slack portion 327 or the folded portion 427, 527, and 528 hardly increase in diameter in the resin curing step.

10] In the above embodiment, the thermosetting resin liquid is used as the curable resin liquid to be injected into the inside of the lining material 1. However, as the curable resin liquid injected into the inside of the lining material of the present invention, for example, a photocurable resin liquid or a room temperature curable one can be used. However, as in the above embodiment, when the second lining member 20 has an overlap portion 22 temporarily bonded by the hot melt adhesive 23, the curable resin liquid is cured and the hot melt adhesive 23 is softened. It is preferable to use a thermosetting resin liquid so that (unbonding) can be performed all at once.

11] In the above embodiment, the lining material 1 is inverted by air pressure. However, the lining material of the present invention may be inverted by a fluid pressure other than air pressure (for example, water pressure).

1, 101, 201, 301, 401, 501 Lining material 10 1st lining member 11 Fiber layer 12 Resin layer 13 1st slit 20, 320, 420, 520 2nd lining member 21 Fiber sheet 22 Overlap part 23 Hot melt adhesive Agent 25 Glass roving cloth (woven fabric)
26, 126, 226 2nd slit 30 Injection nozzle 327 Loose part 427, 527, 528 Folded part P Pipe line

Claims (6)

It is a lining material that is lined in a pipeline by inverting the inner and outer surfaces.
A first lining member composed of a tubular fiber layer and a resin layer covering the outer peripheral surface of the fiber layer,
It is provided with a tubular second lining member arranged inside the first lining member and containing at least high-strength fibers arranged in the circumferential direction thereof.
The second lining member has a longer peripheral length than the first lining member, and is overlaid on a part in the circumferential direction in a state where the first lining member is arranged flat so as to be half the width of the peripheral length. It has a wrap, or has a slack part that is a slack part or a folded part that is a folded part, and has a wrap part.
The first lining member has at least one linear or curved first slit into which an injection nozzle for injecting a curable resin liquid is inserted inside the second lining member.
The second lining member has at least one linear or curved second slit formed at a position where the injection nozzle inserted into the at least one first slit can be inserted.
The at least one second slit is formed along the circumferential direction of the second lining member at a portion of the second lining member that is neither the overlap portion, the slack portion, nor the folded portion. The lining material of the pipeline, which is characterized by being present. The first slit and the second slit intersect in a state where the peripheral portion of the first slit of the first lining member and the peripheral portion of the second slit of the second lining member are overlapped flatly without slack. The lining material for a pipeline according to claim 1 , wherein the material is separated from each other. The lining material for a pipeline according to claim 2 , wherein the at least one first slit is inclined with respect to the tubular axis direction of the first lining member. The lining material for a pipeline according to any one of claims 1 to 3 , wherein the second lining member includes a woven fabric in which the high-strength fibers are arranged at least in the circumferential direction of the second lining member. The second lining member has the overlap portion and has the overlap portion.
The pipeline lining material according to any one of claims 1 to 4 , wherein the overlapping portion is temporarily joined by a hot melt adhesive. The lining material for a pipeline according to any one of claims 1 to 5 , wherein the at least one first slit and the at least one second slit are notches.

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