JP2001191410A - Method for preparing pipe lining material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for preparing a pipe lining material by which a pipe lining material with a multilayered structure can be prepared with good workability and efficiently. SOLUTION: The pipe lining material is prepared by a method wherein the outer face of the first tubular resin adsorption material 2 prepared by coating the inner face with a plastic film is covered with a belt-like resin adsorption material and both end parts of the belt-like resin adsorption material are connected to form the second tubular resin adsorption material 3 and to constitute a multilayered (two-layer) tubular resin adsorption material 1A and the outer face of the multilayered tubular resin adsorption material 1A is covered with a tubular body 9 with highly hermetic properties and after they are turned reversely by a fluid pressure, the tubular body 9 is removed. By the present invention, as the inner face of the first tubular resin adsorption material 2 positioned to the outside face after being turned reversely is coated in advance with a plastic film 4, it is unnecessary to pass a heavy tubular resin adsorption material 1A with a multilayered structure through a seamless plastic tube and it is possible to prepare a pipe lining material with good workability and efficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for producing a pipe lining material used for lining an aged pipe.

[0002]

2. Description of the Related Art When a pipeline such as a sewer pipe buried underground is deteriorated, the pipeline is repaired by lining its inner peripheral surface without excavating the pipeline from the ground. A pipe lining method is known.

[0003] In the above-mentioned pipe lining method, a pipe lining material obtained by impregnating an uncured curable resin into a flexible tubular resin adsorbent whose outer peripheral surface is covered with a highly airtight plastic film is applied by fluid pressure. After the pipe lining is inserted into the pipe while being turned over, the pipe lining is pressed against the inner peripheral surface of the pipe by fluid pressure, and the pipe lining is impregnated by heating or the like while maintaining the state. This is a method of repairing a pipe by forming a plastic pipe in the pipe by curing the resin.

[0004] The thickness of the pipe lining material used in such a pipe lining method is determined by the degree of deterioration of the pipe, the diameter of the pipe, the burial depth of the pipe, and the like. In some cases, a technique of forming the tubular resin adsorbent into a multilayer structure of two or more layers has been implemented.

[0005]

By the way, since the inner surface and the outer surface of the pipe lining material are reversed when the pipe lining material is invertedly inserted into the pipeline, especially in the case of a multilayered pipe lining material, it is located on the outer surface side after the inversion. It is necessary to set the circumferential length of the inner tubular resin adsorbent to be longer than the circumferential length of the outer tubular resin portion layer located on the inner surface side after inversion. For this reason, when manufacturing a pipe lining material having a multilayer structure, it is necessary to fold the inner tubular resin adsorbent having a long perimeter and cover it with the outer tubular resin adsorbent having a short perimeter.

[0006] When manufacturing the outer tubular resin adsorbent, it is necessary to join the widthwise ends of the strip-shaped resin adsorbent to form a tube and hermetically seal the joint. It was not easy to perform the work continuously while covering the folded inner tubular resin adsorbent. In particular,
When the widthwise end portions of the strip-shaped resin adsorbent are joined by sewing in the production of the outer tubular resin adsorbent, the main sewing or the ring stitching in which a seam allowance is exposed to the outside cannot be adopted as a sewing method.

Further, after manufacturing a multilayer tubular resin adsorbent,
In the manufacturing method in which the tubular resin adsorbent is passed through a seamless plastic tube and the outer surface thereof is hermetically covered with the plastic tube, the multilayer tubular resin adsorbent is heavy, and the heavy tubular resin adsorbent is passed through the plastic tube. The work was not easy.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a method of manufacturing a pipe lining material capable of efficiently manufacturing a multi-layered pipe lining material with good workability. It is in.

[0009]

According to the first aspect of the present invention, a tubular resin adsorbent whose outer surface is covered with a highly airtight plastic film is impregnated with a curable resin. In the method for producing a pipe lining material, the outer surface of a first tubular resin adsorbent having an inner surface coated with a plastic film is covered with a band-shaped resin adsorbent, and both ends of the band-shaped resin adsorbent are joined to form a second tubular resin adsorbent. Forming a resin adsorbent to form a multilayer tubular resin adsorbent, covering the outer surface of the multilayer tubular resin adsorbent with a highly airtight tubular body, inverting them by fluid pressure, and then removing the tubular body It is characterized by doing so.

A second aspect of the present invention is characterized in that, in the first aspect of the present invention, the first tubular resin adsorbent and the strip-shaped resin adsorbent are welded or bonded in a spot manner.

According to a third aspect of the present invention, in the first aspect of the present invention, a belt-shaped resin adsorbent formed by coating a plastic film on one side is rolled so that the plastic film becomes an inner surface, and both ends thereof are joined. Constitutes the first tubular resin adsorbent, and after inversion, the first tubular resin adsorbent
The present invention is characterized in that a ribbon tape is welded or adhered to the joining portion of the tubular resin adsorbent to hermetically seal the joining portion.

According to a fourth aspect of the present invention, in the third aspect, the plastic film is made of polyethylene, and the ribbon tape is made of a composite film containing nylon and polyethylene.

According to a fifth aspect of the present invention, in the first aspect of the invention, the first tubular resin adsorbent is formed by inverting a tubular resin adsorbent having an outer surface coated with a plastic film by fluid pressure. It is characterized by doing.

Therefore, according to the present invention, since the inner surface of the first tubular resin adsorbent located on the outer surface side after the inversion is coated with a plastic film in advance, the heavy tubular resin adsorbent having a multilayer structure can be seamlessly applied. This eliminates the need to pass through a plastic tube, thereby making it possible to efficiently produce a pipe lining material with good workability.

In the case where both end portions of the strip-shaped resin adsorbent are joined by sewing when manufacturing the second tubular resin adsorbent located on the inner side after the reversal, a lock stitch or a ring stitch where a seam allowance is exposed to the outside may be used. Since it can be adopted, a multilayer tubular resin adsorbent can be efficiently produced with good workability. Then, even when the seam allowance is exposed on the outer surface because both ends of the belt-shaped resin adsorbent are joined by the lock stitch or the chain stitch in manufacturing the first tubular resin adsorbent positioned outside after the reversal, the seam allowance is reversed. Since it is not hidden behind on the inner surface side and is not exposed on the outer surface later, lockstitching, chain stitching, and the like can be employed for manufacturing the first tubular resin adsorbent.

[0016]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

<First Embodiment> FIGS. 1 to 7 are sectional views showing a method of manufacturing a pipe lining material according to a first embodiment of the present invention in the order of steps, FIG. 8 is an enlarged detailed view of a portion A in FIG. FIG. 9 is an enlarged sectional view of the ribbon tape.

The present embodiment relates to a method for manufacturing a pipe lining material 1 having a two-layer structure shown in FIG. 7, wherein the pipe lining material 1 is provided on the outside of a second tubular resin adsorbent 3 forming an inner layer. Is covered with a first tubular resin adsorbent 2 forming an outer layer, and the outer surface of the first tubular resin adsorbent 2 is covered with a highly airtight plastic film 4. Is impregnated with an uncured liquid curable resin. When the pipe lining material 1 is inverted and inserted into the pipe by fluid pressure during lining of the pipe, the second tubular resin adsorbent 3 forming the inner layer is located on the outside and is pressed against the inner wall of the pipe, and First tubular resin adsorbent 2 forming a layer
Is located inside and the inner surface thereof is covered with the plastic film 4.

Hereinafter, a method of manufacturing the pipe lining material 1 will be described in accordance with the steps.

First, as shown in FIG. 1, a band-shaped resin adsorbing material 2 'coated on one side with a highly airtight plastic film 4 is folded with the plastic film 4 inside as shown in FIG. The overlapped end portions in the width direction are joined by sewing using a sewing needle 5 and a thread 6 to obtain the first tubular resin adsorbent 2. Here, lock stitch or chain stitch is used for sewing, and the first tubular resin adsorbent 2 is used.
The seam allowance 2a is exposed on the outer surface of the joint as shown in FIG.

A nonwoven fabric made of polyester felt is used for the band-shaped resin adsorbent 2 ', and the plastic film 4 coated on the outer surface thereof is a polyurethane film, a polyethylene film, a composite film of polyethylene / nylon / EVOH, or the like. Used.

When the first tubular resin adsorbent 2 is obtained as described above, this tubular resin adsorbent 2 is set on the strip-shaped resin adsorbent 3 'as shown in FIG. The adsorbent 2 and the strip-shaped resin adsorbent 3 'are heated by the burner 7 at two locations a and b shown in the figure and are thermally welded (fire bonded) in a spot manner. Note that the first tubular resin adsorbent 2 and the band-shaped resin adsorbent 3 'may be spot-adhered to each other by an adhesive instead of heat welding.
Further, a non-woven fabric made of polyester felt is used for the band-shaped resin adsorbent 3 ', like the band-shaped resin adsorbent 2'.

As described above, when the first tubular resin adsorbent 2 and the strip-shaped resin adsorbent 3 'are heat-welded in two spots a and b in the drawing, the strip-shaped resin adsorbent 2 The end in the width direction of 3 ′ is lifted in the direction of the arrow in FIG. 3, and as shown in FIG. 4, the first tubular resin adsorbent 2 is wrapped from the outside by the band-shaped resin adsorbent 3 ′. Then, the ends of the band-shaped resin adsorbents 3 ′ are butted together, and the butted portions are joined by lock stitching to form the second tubular resin adsorbent 3 outside the first tubular resin adsorbent 2. A reinforcing ribbon tape 8 is adhered to the outer surface of the joint of the tubular resin adsorbent 3 to reinforce the joint. The reinforcing ribbon tape 8 is made of a resin adsorbent such as polyester, acrylic, nylon felt and the like. When the second tubular resin adsorbent 2 is manufactured, the end portions of the strip-shaped resin adsorbent 3 ′ may be joined by lockstitching,
A joining method by sewing such as chain stitching, welding or adhesion may be adopted.

As described above, the first tubular resin adsorbent 2
And the second tubular resin adsorbent 3 as shown in FIG.
The tubular resin adsorbent 1A having a layered structure is formed. After the pipe lining material 1 is inserted upside down into the pipe by fluid pressure during the lining of the pipe, the first resin adsorbent 1A is formed as described above.
The second tubular resin adsorbent 3 is located on the inside and the second tubular resin adsorbent 3 is located on the outside.
Is set longer than the circumference of the first tubular resin adsorbent 2. Here, the joint of the first tubular resin adsorbent 2 and the joint of the second tubular resin adsorbent 3 are offset in the circumferential direction as shown in FIG. 4 so as not to overlap each other.

When the two-layer tubular resin adsorbent 1A shown in FIG. 4 is obtained as described above, the tubular resin adsorbent 1A
Is inserted into a highly airtight tubular body 9 as shown in FIG. 5, the tubular resin adsorbent 1A is covered with the tubular body 9, one end of each of which is folded outward, and the folded inside has air pressure or the like. Of the tubular resin adsorbent 1A and the tubular body 9
Is inverted as shown in FIG. In this reversal, the tubular body 9 is positioned at the innermost layer and functions to hermetically seal a pressurized fluid such as compressed air, but the tubular body 9 has a composite seamless tube of nylon / polyethylene / adhesive film or the like. A tube formed by coating the outer surface of a nylon cloth with polyurethane and PVC is used.

Thus, as described above, the tubular resin adsorbent 1A
When the tubular body 9 is reversed by the fluid pressure, the second tubular resin adsorbent 3 is located inside to form an internal layer, and the first tubular resin adsorbent 2 is located outside, as shown in FIG. And the outer surface of the first tubular resin adsorbent 2 constituting the outer layer is coated with the plastic film 4. Then, in this state, the ribbon tape 10 is welded or adhered to the outer surface of the joint portion of the first tubular resin adsorbent 2, and another ribbon tape 1 having a wider width from the outside thereof.
1 is welded or adhered to hermetically seal the joint, and the tubular body 9 is pulled out of the inside of the tubular resin adsorbent 1A and removed, and then the tubular resin adsorbent 1A is impregnated with an uncured liquid curable resin. Thus, the required pipe lining material 1 shown in FIG. 7 is obtained. As the uncured liquid curable resin impregnated in the tubular resin adsorbent 1A, an unsaturated polyester resin, an epoxy resin, a vinyl ester resin, or the like is used.

Here, details of the ribbon tapes 10 and 11 are shown in FIG. 8, but one of the ribbon tapes 10 is shown in FIG.
As shown in the figure, the inner layer 10a, the intermediate layer 10b, and the outer layer 1
0c, and the inner layer 10a is made of the same material as the plastic film.
b is made of an adhesive film such as an ionomer or an admer, and the outer layer 10c is made of a material such as nylon or polyester that does not adhere to the other ribbon tape 11. The other ribbon tape 11 is made of a composite film containing nylon and polyethylene.

Thus, the pipe lining material 1 manufactured through the above steps is inserted into the pipe by fluid pressure when the pipe is lined, and after the pipe is turned over, the second layer forming the inner layer is formed. The tubular resin adsorbent 3 is located on the outside and pressed against the inner wall of the conduit, and the first tubular resin adsorbent 2 forming the outer layer is located on the inside and its inner surface is a plastic film 4.
, And the plastic film 4 functions to hermetically seal a pressurized fluid such as compressed air.

Then, when the pipe lining material 1 is invertedly inserted into the pipe by the fluid pressure, the pipe lining material 1 is pressed against the inner peripheral surface of the pipe by the fluid pressure, and the pipe lining is maintained while maintaining the state. When the material 1 is heated or the like and the curable resin impregnated therein is cured, a plastic pipe is formed in the pipe and the pipe is repaired.

As described above, in the method for manufacturing the pipe lining material 1 according to the present invention, the plastic film 4 is previously coated on the inner surface of the first tubular resin adsorbent 2 located on the outer surface side after inversion. The operation of passing the heavy tubular resin adsorbent 1A having a two-layer structure through a seamless plastic tube as in the related art is not required, and the pipe lining material 1 can be efficiently manufactured with good workability.

When both ends of the strip-shaped resin adsorbing material 3 'are joined by sewing at the time of manufacturing the second tubular resin adsorbing material 3 located on the inner surface side after reversing, a seam allowance is exposed to the outside in addition to the lock stitching. Since lock stitching and chain stitching can be employed, the tubular resin adsorbent 1A having a two-layer structure can be efficiently manufactured with good workability. Then, even if the seam allowance 2a is exposed on the outer surface because both ends of the belt-shaped resin adsorbent 2 'are joined by lock stitching or ring stitching or the like at the time of manufacturing the first tubular resin adsorbent 2 positioned outside after the inversion, As shown in FIG. 7, the seam allowance 2a is hidden behind the inner surface after the reversal and is not exposed to the outer surface, so that the first tubular resin adsorbing material 2 can be manufactured by lockstitching or ring stitching.

<Second Embodiment> Next, a second embodiment of the present invention will be described with reference to FIGS. It is a sectional view showing a method for manufacturing a pipe lining material according to Embodiment 2 of the present invention in the order of steps.

In the manufacturing method according to the present embodiment, the method of manufacturing the first tubular resin adsorbent 2 is different from that of the first embodiment.

That is, as shown in FIG. 12, the first inner surface is coated with a highly airtight plastic film 4.
When manufacturing the tubular resin adsorbent 2 of FIG. 1, the tubular resin adsorbent 2 ″ formed by coating the outer surface with a plastic film 4 as shown in FIG. 10 is inverted by a fluid pressure as shown in FIG. The tubular resin adsorbent 2 is obtained. Here, the tubular resin adsorbent 2 ″ shown in FIG. 10 is formed by rolling a band-shaped resin adsorbent, butting the ends thereof, joining the butted portions by sewing, and then joining the joined portions. Of the tubular resin adsorbent 2 ″ with a highly airtight plastic film 4.

Thus, the first method obtained by the above method
As shown in FIG. 12, the tubular resin adsorbent 2 is set on the strip-shaped resin adsorbent 3 ', and the first tubular resin adsorbent 2 and the strip-shaped resin adsorbent 3' are located at two locations a and b in the drawing. Then, it is heated by the burner 7 and thermally welded (fire bonded) in a spot manner.

As described above, when the first tubular resin adsorbent 2 and the strip-shaped resin adsorbent 3 'are thermally welded in spots at the two locations a and b in the drawing, the first tubular resin adsorbent 2' and the strip-shaped resin adsorbent 3 'are welded by the strip-shaped resin adsorbent 3'. One tubular resin adsorbent 2 is wrapped from the outside. Then, as shown in FIG. 13, the ends of the strip-shaped resin adsorbents 3 ′ are butted against each other, and the butted portions are joined by lock stitching, so that the second tubular resin adsorbent 3 is made of the first tubular resin adsorbent 2. It is formed outside, and a reinforcing ribbon tape 13 is adhered to the outer surface of the joint of the second tubular resin adsorbent 3 to reinforce the joint.

As described above, the first tubular resin adsorbent 2
When the tubular resin adsorbent 1A having the two-layer structure is obtained by the second tubular resin adsorbent 3 and the second tubular resin adsorbent 3, the tubular resin adsorbent 1A is
As shown in FIG. 3, the tubular resin adsorbent 1A is inserted into the highly airtight tubular body 9 to cover the tubular resin adsorbent 1A with the tubular body 9, and one end of the both is turned outward, and a fluid such as air pressure is placed inside the folded inside. By applying pressure, the tubular resin adsorbent 1A and the tubular body 9 are reversed as shown in FIG.

Thus, as described above, the tubular resin adsorbent 1A
When the tubular body 9 is reversed by the fluid pressure, the second tubular resin adsorbent 3 is located inside to form an internal layer, and the first tubular resin adsorbent 2 is located outside, as shown in FIG. And the outer surface of the first tubular resin adsorbent 2 constituting the outer layer is coated with the plastic film 4. Thereafter, the tubular body 9 is pulled out from the inside of the tubular resin adsorbent 1A and removed, and then the tubular resin adsorbent 1A is impregnated with an uncured liquid curable resin, whereby the required pipe lining material 1 shown in FIG. 15 is obtained. Therefore, in the present embodiment, the same effect as in the first embodiment can be obtained.

[0039]

As is apparent from the above description, according to the present invention, a tube lining material obtained by impregnating a curable resin into a tubular resin adsorbent whose outer surface is covered with a highly airtight plastic film. In the manufacturing method, an outer surface of a first tubular resin adsorbent having an inner surface coated with a plastic film is covered with a band-shaped resin adsorbent, and both ends of the band-shaped resin adsorbent are joined to form a second tubular resin adsorbent. After forming to form a multilayer tubular resin adsorbent, the outer surface of the multilayer tubular resin adsorbent was covered with a highly airtight tubular body, and after inverting them by fluid pressure, the tubular body was removed, An effect is obtained that a pipe lining material having a multilayer structure can be efficiently manufactured with good workability.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a method for manufacturing a pipe lining material according to Embodiment 1 of the present invention.

FIG. 2 is a cross-sectional view illustrating a method for manufacturing a pipe lining material according to Embodiment 1 of the present invention.

FIG. 3 is a cross-sectional view illustrating the method for manufacturing the pipe lining material according to Embodiment 1 of the present invention.

FIG. 4 is a cross-sectional view illustrating the method for manufacturing the pipe lining material according to Embodiment 1 of the present invention.

FIG. 5 is a cross-sectional view illustrating the method for manufacturing the pipe lining material according to Embodiment 1 of the present invention.

FIG. 6 is a cross-sectional view illustrating the method for manufacturing the pipe lining material according to Embodiment 1 of the present invention.

FIG. 7 is a cross-sectional view illustrating the method for manufacturing the pipe lining material according to Embodiment 1 of the present invention.

8 is an enlarged detail view of a portion A in FIG. 7;

FIG. 9 is an enlarged sectional view of the ribbon tape.

FIG. 10 is a cross-sectional view showing a method for manufacturing a pipe lining material according to Embodiment 2 of the present invention.

FIG. 11 is a cross-sectional view showing a method for manufacturing a pipe lining material according to Embodiment 2 of the present invention.

FIG. 12 is a cross-sectional view illustrating a method for manufacturing a pipe lining material according to Embodiment 2 of the present invention.

FIG. 13 is a cross-sectional view illustrating a method for manufacturing a pipe lining material according to Embodiment 2 of the present invention.

FIG. 14 is a cross-sectional view showing a method for manufacturing a pipe lining material according to Embodiment 2 of the present invention.

FIG. 15 is a cross-sectional view illustrating a method for manufacturing a pipe lining material according to Embodiment 2 of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 pipe lining material 1A multilayer tubular resin adsorbent 2 first tubular resin adsorbent 2 'strip resin adsorbent 3 second tubular resin adsorbent 3' strip resin adsorbent 4 plastic film 9 tubular body 10, 11 ribbon tape

 ──────────────────────────────────────────────────続 き Continuation of the front page (71) Applicant 592004301 All Co., Ltd. 1-194, Hayashi, Tokorozawa-shi, Saitama 4 (72) Inventor Takao Kamiyama 31-27 Daikancho, Hiratsuka-shi, Kanagawa Shonan Synthetic Resin Co., Ltd. In-house (72) Inventor Yasuhiro Yokoshima 175-3 Shinoyama, Ishishita-cho, Yuki-gun, Ibaraki Pref.Yokoshimanai Co., Ltd. (72) Inventor Shigeru Endo 2-12-4 Hanahata, Tsukuba, Ibaraki Pref. Inventor Hiroyuki Aoki 1-194 Hayashi, Tokorozawa-shi, Saitama F-term in all four stock companies (reference) 3H025 EB23 EC06 ED02 4F211 AA04 AD12 AD20 AG03 AG08 AH43 SA13 SC03 SD04 SD11 SD15 SD19 SH18 SH30

Claims (5)

[Claims] 1. A method for producing a tube lining material comprising impregnating a curable resin into a tubular resin adsorbent whose outer surface is covered with a highly airtight plastic film, wherein the inner surface is coated with a plastic film. The outer surface of the tubular resin adsorbent is covered with a band-shaped resin adsorbent, and both ends of the band-shaped resin adsorbent are joined to form a second tubular resin adsorbent to form a multilayer tubular resin adsorbent. A method for producing a pipe lining material, characterized in that the outer surface of the tubular resin adsorbent is covered with a highly airtight tubular body, these are reversed by fluid pressure, and then the tubular body is removed. 2. The method according to claim 1, wherein the first tubular resin adsorbent and the strip-shaped resin adsorbent are spot welded or bonded. 3. The first tubular resin adsorbent is formed by rolling a band-shaped resin adsorbent formed by coating a plastic film on one side so that the plastic film becomes an inner surface and joining both ends thereof. 2. The method for manufacturing a pipe lining material according to claim 1, wherein a ribbon tape is welded or bonded to a joint portion of the first tubular resin adsorbent material to hermetically seal the joint portion. 4. The method for manufacturing a pipe lining material according to claim 3, wherein said plastic film is made of polyethylene, and said ribbon tape is made of a composite film containing nylon and polyethylene. 5. The first tubular resin adsorbent according to claim 1, wherein the first tubular resin adsorbent is formed by inverting a tubular resin adsorbent having an outer surface coated with a plastic film by fluid pressure. Manufacturing method of pipe lining material.