JP5438497B2 - Tubular insert of lining material - Google Patents

Description

  The present invention relates to a tubular insert made of a nonwoven fabric used for a lining material used for repairing or reinforcing a pipe line.

  Conventionally, what uses a cylindrical nonwoven fabric as a lining material used for repair, reinforcement, etc. of a pipe line is known. Such a lining material is inserted into a pipe line in a state in which a cylindrical nonwoven fabric is impregnated with a resin, and an internal pressure is applied to the cylindrical nonwoven cloth to cure the resin while being pressed against the inner surface of the pipe line. It is intended to repair and reinforce roads.

  The cylindrical nonwoven fabric can be formed by sewing the end portions of the sheet-shaped nonwoven fabric, but in such a cylindrical nonwoven fabric, the strength of the sewing portion is low, and the internal pressure is applied to the cylindrical nonwoven fabric. It is preferable to reinforce the sewing portion because there is a risk of breakage at the sewing portion. As a technique for reinforcing the sewing portion of the tubular nonwoven fabric, for example, there is one disclosed in Patent Document 1. In this patent document 1, the ribbon of a synthetic resin material is affixed to the sewing part of a cylindrical nonwoven fabric, heating and softening, and the reinforcement of a sewing part and the sealing of a needle hole are aimed at.

  In addition, the nonwoven fabric is a material suitable for use as a lining material because it can be impregnated with a large amount of resin. However, since the strength is low, there is also a material using a tubular woven fabric for reinforcement. Patent Document 2 discloses a lining material having a tubular fabric and a tubular nonwoven fabric inserted into the tubular fabric. This lining material is used by inverting the inner and outer surfaces and pulling it into the pipeline, and when pulled into the pipeline, the tubular fabric is located inside and the tubular nonwoven fabric is located outside and the resin is impregnated. The formed cylindrical nonwoven fabric is in close contact with the inner surface of the pipeline.

Japanese Examined Patent Publication No. 58-33098 (Fig. 2) JP 2001-30356 A

  The lining material of Patent Document 1 is not sufficient although the pressure resistance of the sewn part of the tubular nonwoven fabric is improved to some extent by the ribbon of the synthetic resin material, but is not sufficient, and breaks at the sewn part when a high internal pressure is applied. There is a fear. Further, in the tubular nonwoven fabric of Patent Document 1, since the reinforcement in the length direction is not made, when a large tensile force acts on the tubular nonwoven fabric in the length direction when the lining material is installed in the pipe line, etc. The tubular nonwoven fabric may be broken.

  Since the lining material of Patent Document 2 is reinforced in the length direction by a tubular woven fabric, the tubular nonwoven fabric is prevented from being broken at the time of reverse drawing into the pipe. However, when the tubular non-woven fabric is drawn into the tubular woven fabric and inserted in the lining material manufacturing stage, a tensile force acts on the weak non-woven tubular non-woven fabric, and the tubular non-woven fabric may be broken.

  The object of the present invention is to increase the strength of the sewn portion of the tubular nonwoven fabric, and also to increase the tensile strength in the longitudinal direction of the tubular nonwoven fabric, thereby preventing breakage during drawing into the tubular fabric. It is to provide a tubular insert of lining material.

Means for Solving the Problems and Effects of the Invention

The cylindrical insert of the lining material of the first invention is inserted into the tubular woven fabric, and constitutes the lining material installed in the pipeline while the inner and outer surfaces are inverted, and the cylindrical insertion of the lining material A cylindrical nonwoven fabric formed by sewing end portions of a sheet-shaped nonwoven fabric, and extending in the length direction of the cylindrical nonwoven fabric, and joined to a sewing portion of the cylindrical nonwoven fabric. was closed and woven fabric made of high strength low elongation fibers, the woven fabric, only a part related to the width direction is joined to the tubular nonwoven fabric, the total width of the woven fabric, joined to the tubular nonwoven fabric It is characterized in that the width is 1.2 to 3 times the width of the portion .

  According to this structure, since the woven fabric which consists of a high intensity | strength low elongation fiber is joined to the sewing part of a cylindrical nonwoven fabric, the intensity | strength of a sewing part improves greatly. Moreover, the tensile strength of the length direction of a cylindrical nonwoven fabric improves by joining the woven fabric extended in the length direction of a cylindrical nonwoven fabric to a cylindrical nonwoven fabric. Therefore, the tubular nonwoven fabric is prevented from being broken at the time of drawing into the tubular fabric.

  In addition, since the nonwoven fabric is simply entangled with the fiber, even if the pulling is completed and the tensile load is released after the tensile load is applied to the nonwoven fabric during the pulling into the tubular woven fabric, the nonwoven fabric is released. Remains in the stretched state without returning to its original length, and the thickness decreases according to the amount of elongation. In addition, when the woven fabric is a fiber having a high elongation, the elongation of the entire tubular insertion material is also increased, and uneven elongation (non-uniform thickness) is likely to occur in the tubular nonwoven fabric. However, in the present invention, since the woven fabric is made of low elongation fibers, the elongation of the entire tubular insert is also lowered, so that uneven elongation is suppressed.

Further , according to this configuration, only a part of the woven fabric in the width direction is joined to the cylindrical nonwoven fabric, and the other part is not joined to the cylindrical nonwoven fabric, so that the internal pressure acts after being drawn into the pipe line. The elongation in the circumferential direction of the cylindrical nonwoven fabric is hardly restricted by the woven fabric. In addition, since the stretch in the circumferential direction is regulated by the woven fabric at the joint portion of the tubular nonwoven fabric with the woven fabric, the stretch at the non-joint portion is not regulated, so there is a difference in stretch between the joint portion and the non-joint portion. And the thickness of the cylindrical nonwoven fabric becomes uneven in the circumferential direction. Therefore, in order to reduce this non-uniformity, it is better not to unnecessarily increase the joining width of the woven fabric with the cylindrical nonwoven fabric beyond the width necessary for reinforcing the sewing portion. However, on the other hand, increasing the overall width of the woven fabric is effective for improving the tensile strength of the tubular nonwoven fabric. Also from this point, it is preferable that only a part of the woven fabric is joined to the cylindrical nonwoven fabric.

In addition, as described above, it is preferable that only a part of the woven fabric is bonded to the cylindrical nonwoven fabric, but conversely, the entire width of the woven fabric is larger than the width of the bonded portion with the cylindrical nonwoven fabric. If it is too large, the end portion of the woven fabric that is not joined to the tubular nonwoven fabric moves and folds during the lining operation, and the strength of the lining material becomes uneven. Therefore, the total width of the woven fabric is preferably 1.2 to 3 times the width of the portion joined to the tubular nonwoven fabric.

In the first invention, the woven fabric is preferably a glass cloth ( second invention).

In the tubular insert of the lining material of the third invention, in the first or second invention, the width of the portion of the woven fabric joined to the tubular nonwoven fabric is 5 of the width of the sewing portion. It is characterized by being 10 times to 10 times.

  If the width of the joint portion of the woven fabric with the tubular nonwoven fabric is too small, the reinforcement of the sewn portion with the woven fabric will be insufficient. On the other hand, if the joining width is too large, the elongation in the circumferential direction of the tubular nonwoven fabric when the internal pressure is applied after being drawn into the conduit is restricted by the woven fabric. In addition, the thickness of the cylindrical nonwoven fabric becomes non-uniform in the circumferential direction due to the difference in the elongation in the circumferential direction between the joined portion and the non-joined portion of the tubular nonwoven fabric. The larger the joint area, the more prominent. Therefore, the width of the portion of the woven fabric joined to the tubular nonwoven fabric is preferably 5 to 10 times the width of the sewing portion.

It is a perspective view of the lining material which concerns on this embodiment. It is an enlarged view of the sewing part of a cylindrical nonwoven fabric. (A) is a photograph showing a hot melt adhesive, and (b) is an enlarged photograph of (a).

  Next, an embodiment of the present invention will be described. FIG. 1 is a perspective view of a lining material according to the present embodiment. The lining material is drawn into the existing pipeline while the inner and outer surfaces are reversed, and covers the inner surface of the existing pipeline.

  As shown in FIG. 1, the lining material 1 includes a tubular fabric 2 and a tubular insert 7 inserted into the tubular fabric 2. The tubular woven fabric 2 is a woven fabric made of polyester fibers, for example, and the outer surface thereof is covered with a synthetic resin coating 4 and has airtightness.

  The tubular insert 7 includes a tubular nonwoven fabric 3 and a woven fabric 6 joined to the tubular nonwoven fabric 3. In FIG. 1, what has the inner and outer two layers of the cylindrical nonwoven fabric 3 is shown, but these two layers of the cylindrical nonwoven fabric 3 differ only in the diameter, and the other configurations are the same. The tubular nonwoven fabric 3 is formed in a tubular shape by sewing the sheet-shaped nonwoven fabric in a state where the side ends are abutted against each other.

  As will be described later, the tubular nonwoven fabric 3 is drawn into the existing pipe line while being inverted inside and outside in a state of being impregnated with the curable resin liquid, and then is expanded by being applied with internal pressure to be pressed against the inner surface of the pipe line. Is done. In FIG. 1, by stacking two layers of the tubular nonwoven fabric 3, a larger amount of resin liquid can be impregnated than when the tubular nonwoven fabric 3 is only one layer. .

  However, the number of the cylindrical nonwoven fabrics 3 is not limited to two, and can be changed as necessary. When using the some cylindrical nonwoven fabric 3, it is preferable to laminate | stack in the state which shifted the position of the sewing part 3a to the circumferential direction so that those sewing parts 3a may not overlap. In FIG. 1, two layers of the cylindrical nonwoven fabric 3 are arranged so that the positions of the sewing parts 3 a are shifted by 180 degrees.

  For example, a spunbond nonwoven fabric or a melt blown nonwoven fabric can be used as the nonwoven fabric sheet constituting the cylindrical nonwoven fabric 3. Alternatively, instead of the nonwoven fabric alone, a laminated material in which nonwoven fabrics and glass fiber mats are alternately laminated may be rolled into a cylindrical shape and sewn to form the tubular nonwoven fabric 3. In this case, when the laminated material is impregnated with the curable resin liquid and the resin liquid is cured, the glass fiber mat constitutes the FRP, and the strength is improved.

  FIG. 2 is an enlarged view of the sewing portion 3 a of the tubular nonwoven fabric 3. A woven fabric 6 extending in the length direction of the tubular nonwoven fabric 3 is joined to the outer surface of the sewing portion 3 a of the tubular nonwoven fabric 3. As the woven fabric 6, one woven with high strength and low elongation fibers is used. Here, as the high-strength and low-elongation fibers, fibers commonly called super fibers, high-performance fibers, high-tech fibers, or the like are used. Examples of the fibers include glass fibers, aramid (fully aromatic polyamide) fibers, carbon fibers, metal fibers, ceramic fibers, wholly aromatic polyester fibers, and ultrahigh molecular weight polyethylene fibers. Moreover, as glass fiber, there exist E glass, C glass, ECR glass, etc., and it selects suitably according to an application environment. Since the woven fabric 6 composed of such high-strength and low-stretch fibers has high strength, the eyes can be made rougher than a woven fabric woven with ordinary fibers. There is an advantage that the resin liquid is easily impregnated. Further, as described above, when glass fiber is used as the woven fabric 6 joined to the sewing portion 3a when the glass nonwoven fabric 3 includes glass fibers (glass fiber mat), the cylindrical nonwoven fabric is used. Since the materials of 3 and 6 are close to each other and the elongations of both are almost equal, the strength is increased.

The woven fabric 6 is joined to the tubular nonwoven fabric 3 through the adhesive layer 5 so as to cover the sewing portion 3a. As shown in FIGS. 1 and 2, it is preferable that the woven fabric 6 is joined so that the respective centers in the width direction of the woven fabric 6, the adhesive layer 5, and the sewing portion 3a substantially coincide with each other. Although various adhesives can be used as the adhesive layer 5, for example, a hot melt adhesive can be used. An example of the physical properties of the hot-melt adhesive that can be used (product name Dynac, manufactured by Kureha Tech Co., Ltd.)
Is shown in Table 1.

  When a hot melt adhesive is used, the hot melt adhesive is placed so as to straddle the sewing portion 3a of the tubular nonwoven fabric 3, and after the woven fabric 6 is overlaid thereon, the hot melt adhesive is heated from above the woven fabric 6 with an iron or the like. The melt adhesive is heated and pressed to join the woven fabric 6 to the tubular nonwoven fabric 3. In addition, as shown in Table 1, the bonding temperature of the hot melt adhesive itself is 140 to 160 ° C. However, when the iron is applied from above the woven fabric 6 and heated and pressed, the temperature of the iron is as follows. Is preferably set to a temperature equal to or higher than the above bonding temperature, specifically 195 ° C. or higher.

  FIG. 3 is a photograph of an actual hot melt adhesive. The hot melt adhesive has a so-called spider web-like form in which many elongated resins are entangled. Therefore, since the adhesive layer 5 has a structure in which many small gaps exist between the elongated resins, when the tubular nonwoven fabric 3 is impregnated with the resin liquid, a part of the resin liquid is contained in the adhesive layer 5. Since it reaches the woven fabric 6 through the gap and the woven fabric 6 is impregnated with the resin liquid to form the FRP, the strength is improved.

  Next, an example is given and demonstrated about the manufacturing method of the lining material 1 demonstrated above, and the repair method of the pipe line using this lining material 1. FIG.

(Manufacturing method of lining material)
First, the cylindrical insert 7 is produced as follows.
After the sheet-like nonwoven fabric is rounded and the side end portions are butted together, the butted portion is sewn to produce the tubular nonwoven fabric 3. Next, a hot melt adhesive as shown in FIG. 3 is arranged along the sewing portion 3 a, and a woven fabric 6 that is long in the length direction of the tubular nonwoven fabric 3 is placed thereon. At this time, the center of the woven fabric 6 in the width direction, the center of the adhesive layer 5 (hot melt adhesive) in the width direction, and the center of the sewing portion 3a in the width direction (butting portion of the non-woven fabric) are substantially matched. Then, the hot melt adhesive is melted by applying an iron from above the woven fabric 6 and applying heat and pressure to join the woven fabric 6 and the tubular nonwoven fabric 3 together.

  Next, a resin coating 4 is formed on the outer surface of the tubular fabric 2 formed by weaving warp and weft, and the above-described tubular insert 7 is drawn into the tubular fabric 2. In addition, as shown in FIG. 1, when two or more cylindrical insertion materials 7 are used, the position of the sewing part 3a is shifted in the circumferential direction so that the sewing parts 3a of the cylindrical nonwoven fabric 3 do not overlap each other.

  Here, when pulling and inserting the cylindrical insert 7 into the tubular fabric 2, a tensile force in the length direction acts on the tubular insert 7 and the strength of the tubular nonwoven fabric 3 is low. There is a risk of breaking. However, in the present embodiment, the cylindrical insertion material 7 has a structure in which the cylindrical nonwoven fabric 3 is reinforced in the length direction by the woven fabric 6, so that the cylindrical nonwoven fabric 3 at the time of drawing into the cylindrical fabric 2. Is prevented from breaking.

  In addition, since the nonwoven fabric is simply a tangled fiber, after the tensile load acts on the nonwoven fabric when it is pulled into the tubular fabric 2, the pulling is completed and the tensile load is released. The nonwoven fabric remains stretched without returning to its original length, and the thickness decreases according to the amount of stretch. In addition, when the woven fabric 6 is a fiber having a high elongation, the overall elongation of the tubular insert 7 is also increased, and uneven elongation (non-uniform thickness) is likely to occur in the tubular nonwoven fabric 3. However, in this embodiment, since the woven fabric 6 is made of low-stretch fibers, the overall elongation of the tubular insert 7 is also low, so that the stretch is uneven (the thickness is uneven). It can be suppressed.

(Pipe repair method)
First, a curable resin liquid is poured into the tubular nonwoven fabric 3 and squeezed with a roller so that the entire tubular nonwoven fabric 3 is uniformly impregnated with the resin liquid. Here, since the woven fabric 6 and the sewing portion 3a of the tubular nonwoven fabric 3 are bonded with a hot melt adhesive in which a large number of elongated resins are entangled, the resin is removed from a large number of gaps existing between the resins in the adhesive layer. The liquid reaches the woven fabric 6 and the woven fabric 6 is also impregnated with the resin liquid.

  Next, a fluid pressure is applied to the lining material 1 impregnated with the resin liquid so that the inner and outer surfaces are reversed, and the lining material 1 is drawn into the existing pipe. In the lining material 1 of the present embodiment, the tubular nonwoven fabric 3 is reinforced by the tubular fabric 2, and the woven fabric 6 made of high-strength low-stretch fibers is joined to the sewing portion 3a of the tubular nonwoven fabric 3. Therefore, it has high tensile strength and does not break due to the pulling force when it is pulled into the pipe.

  After the reversal pull-in, the inner pressure is applied to the lining material 1 by fluid pressure to expand the tubular nonwoven fabric 3, and the curable resin liquid impregnated in the tubular nonwoven fabric 3 is cured, so that the inner surface of the existing piping is Form a strong repair tube. Here, since the woven fabric 6 is joined to the sewing part 3a of the cylindrical nonwoven fabric 3, the pressure resistance of the sewing part 3a is greatly improved, and the breaking of the sewing part 3a during expansion of the cylindrical nonwoven fabric 3 is prevented. Is done.

  Further, from the viewpoint of surely reinforcing the sewing portion 3a of the tubular nonwoven fabric 3, as shown in FIGS. 1 and 2, the full width W3 of the woven fabric 6 (the circumferential length of the tubular nonwoven fabric 3) is tubular. It is preferable that it is larger than the width W1 of the sewing part 3a of the nonwoven fabric 3 (interval between the needle holes respectively formed at the two side end parts to be sewn). However, when all the portions of the woven fabric 6 that protrude outward in the width direction from the sewing portion 3a are joined to the tubular nonwoven fabric 3, when the internal pressure is applied to the tubular nonwoven fabric 3 after being drawn into the existing pipe line The elongation in the circumferential direction of the tubular nonwoven fabric 3 is regulated by the woven fabric 6 and is difficult to expand. Therefore, it is preferable that only a part of the woven fabric 6 in the width direction (a central portion in the width direction) is joined to the tubular nonwoven fabric 3 and an outer portion in the width direction is not joined to the tubular nonwoven fabric 3.

  Further, the joining portion of the tubular nonwoven fabric 3 with the woven fabric 6 is restricted in the circumferential direction by the woven fabric 6, while the non-joining portion is not restricted in the circumferential direction. A difference in elongation between the two, and as a result, the thickness of the cylindrical nonwoven fabric 3 becomes uneven in the circumferential direction. Therefore, it is better not to unnecessarily increase the joining width W2 of the woven fabric 6 with the tubular nonwoven fabric 3 (the width of the adhesive layer 5) beyond the width necessary for reinforcing the sewing portion 3a. However, increasing the overall width W3 of the woven fabric 6 is effective for improving the tensile strength of the tubular nonwoven fabric 3. Also from this point, it is preferable that only a part of the woven fabric 6 is joined to the tubular nonwoven fabric 3.

  On the other hand, if the total width W3 of the woven fabric 6 is too large with respect to the joining width W2 with the tubular nonwoven fabric 3, the end in the width direction that is not joined to the tubular nonwoven fabric 3 of the woven fabric 6 during the lining operation. It moves and folds, and the strength of the lining material 1 becomes non-uniform. Therefore, the total width W3 of the woven fabric 6 is preferably 1.2 to 3 times the width W2 of the portion joined to the tubular nonwoven fabric 3.

  Moreover, when the joining width W2 with the cylindrical nonwoven fabric 3 of the woven fabric 6 is too small, reinforcement of the sewing part 3a by the woven fabric 6 will become inadequate. On the other hand, if the bonding width W2 is too large, the woven fabric 6 restricts the circumferential extension of the tubular nonwoven fabric 3 when the internal pressure is applied. In addition, due to the difference in the elongation in the circumferential direction between the joined portion of the tubular nonwoven fabric 3 with the woven fabric 6 and the non-joined portion, the thickness of the tubular nonwoven fabric 3 becomes uneven in the circumferential direction. This appears remarkably when the joint portion with the woven fabric 6 is large. From these viewpoints, the width W2 of the portion of the woven fabric 6 joined to the tubular nonwoven fabric 3 is preferably 5 to 10 times the width W1 of the sewing portion 3a.

  In the above embodiment, the woven fabric 6 is joined to the tubular nonwoven fabric 3 using the adhesive layer 5 (hot melt adhesive). However, the joining method is not limited to this. For example, the woven fabric 6 can be sewn. May be bonded to the tubular nonwoven fabric 3 (in this case, the adhesive layer 5 does not exist).

DESCRIPTION OF SYMBOLS 1 Liner material 2 Tubular fabric 3 Tubular nonwoven fabric 3a Sewing part 5 Adhesive layer 6 Woven fabric 7 Tubular insert

Claims (3)

A tubular insert of a lining material that is inserted into a tubular woven fabric and constitutes a lining material that is installed in a pipeline while the inner and outer surfaces are reversed,
A cylindrical nonwoven fabric formed by sewing the ends of the sheet-shaped nonwoven fabric, and
A woven fabric that extends in the length direction of the tubular nonwoven fabric and is made of high-strength low-stretch fibers joined to the sewing portion of the tubular nonwoven fabric;
I have a,
The woven fabric is bonded to the tubular nonwoven fabric only a part in the width direction,
A tubular insertion material for a lining material , wherein the entire width of the woven fabric is 1.2 to 3 times the width of the portion joined to the tubular nonwoven fabric . The tubular insert for lining material according to claim 1, wherein the woven fabric is a glass cloth. The width of the part joined to the said cylindrical nonwoven fabric of the said woven fabric is 5 to 10 times the width of the said sewing part, The cylindrical inside of the lining material of Claim 1 or 2 characterized by the above-mentioned. Insert material.