JP5926483B2 - Lined lining material and lined lining method using the same - Google Patents

Description

  The present invention relates to a lining material used for repairing or reinforcing a pipeline, and a pipeline lining method using the lining material.

  Conventionally, a cylindrical lining material containing a curable resin liquid and a reinforcing fiber is installed on the inner surface of an existing pipe such as an aged water and sewage pipe, agricultural water pipe, or gas pipe, and the curable resin liquid There is known a method of repairing or reinforcing a pipeline by constructing a strong lining structure made of fiber reinforced resin in the pipeline by curing. Among them, a sheet-like lining material impregnated with a curable resin liquid is rolled into a tubular shape with both ends overlapped, and then the both ends are slid by applying internal pressure. A construction method in which a lining material is brought into close contact with the inner surface of a pipeline is known (see Patent Documents 1 and 2).

  As a lining material used in the above construction method, in Patent Document 1, a sheet material (sheet molding compound: SMC) in which short-strength high-strength fibers are dispersed in a curable resin liquid is used. In Patent Document 2, a sheet material is used in which a chopped strand mat in which strands such as glass fibers are integrally hardened with a binder and a reinforcing fiber layer made of roving or cloth such as glass fibers is laminated. The sheet material is impregnated with a thermosetting resin liquid.

JP-A-5-278177 JP-A-6-221492

  The lining material of Patent Document 1 is SMC in which high-strength fibers of short fibers are dispersed in a curable resin liquid. To build a strong lining structure, it is necessary to increase the thickness of the lining material. However, if the thickness of the lining material is large, the weight also increases, and it becomes difficult to load a large amount of lining material on a truck or the like to be transported to the site, making it difficult to repair (or reinforce) the pipe over a long distance. There is also a problem that the inner diameter of the pipe line after repair (reinforcement) becomes smaller as the thickness of the lining material becomes larger. From such a viewpoint, it is desirable to use a lining material having higher strength in order to reduce the thickness.

  In this regard, the lining material of Patent Document 2 has a reinforcing fiber layer made of roving or cloth such as glass fiber, and has higher strength than the lining material of Patent Document 1 described above. However, when pulling the lining material into the pipeline, or when both ends slide and expand the diameter due to the subsequent internal pressure action, when a large external force acts on the lining material, in the reinforcing fiber layer such as glass cloth, There is a risk of fiber misalignment (mesh misalignment). In this case, the strength of the lining material is locally reduced at the position where the misalignment occurs.

  An object of the present invention is to provide a lining material that can improve strength by using a woven fabric made of glass fibers as a lining material, and that can prevent misalignment of glass fibers constituting the woven fabric and express uniform strength. is there.

Means for Solving the Problems and Effects of the Invention

The lining material of the pipe of the first invention is a lining material of the pipe that is drawn into the pipe while the inner and outer surfaces are reversed by the fluid pressure, and the nonwoven fabric made of organic fibers and the woven fabric made of glass fiber overlap each other. in state comprises a needle-punched lamination members rounded into a cylindrical shape and covers the outer surface of the cylindrical of the needle-punching the laminated member, a tubular fabric with airtight, wherein the needle punching the laminated member, a circumferential Joined by a hot melt adhesive in a state where both ends in the direction are overlapped, and the hot melt adhesive is a plurality of parallel, parallel to the cylinder length direction, at the circumferential end of the needle punch laminated member rolled into a cylindrical shape. It is characterized in that it is partially provided by being divided into elongated regions.

Since the nonwoven fabric has a structure in which long fibers are entangled, when an external force is applied to the fabric made of glass fibers, resistance is given to the glass fibers constituting the fabric by the nonwoven fabric joined in a state of being superimposed on the fabric. Therefore, fiber misalignment, that is, mesh misalignment of the woven fabric made of glass fiber is suppressed. The nonwoven fabric also prevents fraying of the glass fibers at the end of the fabric. Thereby, a uniform and high-strength lining layer can be formed inside the pipe line.
Further, the lining material is drawn into the pipeline in a state where the laminated member is rolled into a cylindrical shape and impregnated with a liquid thermosetting resin. After that, the inner liner is heated and the inner pressure is applied, so that both end portions in the circumferential direction of the laminated member slide and move so that the inner liner expands in diameter and is in close contact with the inner surface of the pipe. Is cured. Here, in this invention, since the both ends of a laminated member are temporarily joined with the hot-melt adhesive agent, when drawing a lining material in a pipe line, it is prevented that both ends shift and a laminated member spreads. In addition, when the lining material is heated and pressurized after installation in the pipeline, the hot melt adhesive softens, so that the temporary joining at both ends of the laminated member is released and it can be slid, and the lining material is expanded by the inner pressure. You can diameter.

The lining material of the pipe line of the second invention is characterized in that, in the first invention, the needle punch laminated member has a structure in which the nonwoven fabric is superposed on both surfaces of the woven fabric made of glass fiber. To do.

  In this invention, since it becomes the structure where the textile fabric which consists of glass fiber was pinched | interposed by the nonwoven fabric of two layers, misalignment and fraying of a textile fabric are further suppressed.

  In addition, the woven fabric made of the glass fibers described above may be a glass roving cloth (third invention). In this case, the lining material has a very high strength.

In the lining material for a pipeline according to a fourth aspect of the present invention, in any one of the first to third aspects, the circumference of the needle punch laminated member is 1.06 times or more of the circumference of the pipeline. It is what.

  If the amount of overlap in the circumferential direction at both ends of the laminated member is small in the state of being in close contact with the inner surface of the duct, the strength of the lining material is locally lowered at the overlapped portion. Further, when there is a variation in the inner diameter of the pipe, the variation cannot be absorbed if the overlap amount is small. Therefore, it is preferable that the circumferential length of the laminated member is not less than a certain value (1.06 times or more of the pipe circumferential length) to ensure the overlapping amount of both ends of the laminated member.

A pipeline lining method according to a fifth invention is a pipeline lining method using the pipeline lining material according to the first invention, wherein the needle punch laminated member is rounded into a cylindrical shape. In the state where both ends in the circumferential direction are overlapped with each other, impregnated with a curable resin liquid, and the lining material is installed in a pipeline while reversing the inner and outer surfaces by fluid pressure; and Heating and pressurizing the curable resin liquid while heating the lining material and pressurizing it from the inside so that the circumferential ends of the needle punch laminated member are slid together while the lining material is in close contact with the inner surface of the pipe line And a process.

  In the present invention, even when a large external force acts on the woven fabric made of glass fiber when the lining material is drawn into the pipe line in the installation process or when both ends in the circumferential direction of the laminated member slide in the heating and pressurizing process, Since the nonwoven fabric is overlapped and joined to the woven fabric, misalignment of the woven fabric is suppressed. Also, fraying at the end of the fabric during the lining operation is prevented.

According to a sixth aspect of the present invention, there is provided the method for lining a pipe line according to the fifth aspect, wherein in the heating and pressing step, the lining material is heated and pressed from the inside, whereby the needle punch lamination with the hot melt adhesive is performed. It is characterized in that the joining at both ends in the circumferential direction of the member is released.

  In the present invention, since both ends of the laminated member are temporarily joined with the hot melt adhesive, the laminated member is prevented from spreading when the lining material is drawn into the pipe line in the installation process. Furthermore, in the heating and pressurizing step after the lining material is installed in the pipeline, when the lining material is heated, the bonding force of the hot melt adhesive is reduced, and the lining material is pressurized from the inside in that state. Thus, the temporary joining of both end portions of the laminated member by the hot melt adhesive is released and the slide member can be slid, and the lining material is expanded in diameter by the action of the internal pressure and is in close contact with the inner surface of the pipeline.

It is a perspective view of the lining material which concerns on this embodiment. It is a figure which shows a laminated member, (a) is a perspective view, (b) is sectional drawing. It is the figure which expanded the junction part of the both ends of the laminated member of FIG. It is the figure which looked at the lining material in the middle of inversion from the length direction. It is a figure which shows the lining material after inversion (after installation in a pipe line), (a) is sectional drawing, (b) is an enlarged view of the ellipse part A of (a). It is a figure which shows the lining material after a heating-pressing process, (a) is sectional drawing, (b) is an enlarged view of the ellipse part B of (a).

  Next, an embodiment of the present invention will be described. FIG. 1 is a perspective view of a lining material 1 according to the present embodiment. The lining material of the present embodiment is used for repairing existing pipelines such as agricultural water, and after being drawn into the existing pipeline while the inner and outer surfaces are reversed, the inner pressure is applied to expand the diameter. In close contact with the inner surface of the pipeline, the inner surface of the pipeline is covered.

  First, the structure of the lining material 1 will be described. As shown in FIG. 1, the lining material 1 includes a laminated member 2 that is formed in a sheet shape and rounded into a tubular shape, and a tubular woven fabric 3 that covers the outer surface of the tubular laminated member 2.

  2A is a perspective view of the laminated member 2, and FIG. 2B is a cross-sectional view of the laminated member 2. As shown in FIG.2 (b), the sheet-like laminated member 2 has the organic fiber spunbond nonwoven fabric 4 and the glass roving cloth 5 woven by high strength glass roving alternately stacked. The layers are joined by a needle punch. Further, the nonwoven fabric 4 is superimposed on both surfaces of the glass roving cloth 5, and the glass roving cloth 5 is sandwiched between the nonwoven fabrics 4.

  As shown in FIG. 1, the laminated member 2 is rolled into a cylindrical shape, and is further joined by a hot melt adhesive 6 in a state where both ends in the circumferential direction are overlapped. FIG. 3 is an enlarged view of a joint portion at both ends of the laminated member 2 of FIG. As shown in FIG. 3, the hot melt adhesive 6 is not applied to the entire surface of the end portion of the laminated member 2, but is divided into a plurality (two in the figure) of elongated regions parallel to the cylinder length direction. Applied partially. And the other end part is overlaid on the application surface of the adhesive 6 at one end part of the laminated member 2, and both end parts of the laminated member 2 are joined. As the hot melt adhesive 6, for example, a hot melt adhesive EP-65 manufactured by MORESCO Co., Ltd. can be suitably used.

  It should be noted that the joining of the both end portions of the laminated member 2 is sufficient with such a joining strength as to temporarily fix the both ends so as not to be displaced when the lining material 1 is reversed and pulled into the pipe P. As will be described later, the hot melt adhesive 6 is softened by the heating and pressurizing step after the lining material 1 is installed in the pipe P, and the joining of both ends is released.

  The tubular woven fabric 3 shown in FIG. 1 is woven with polyester fibers, for example. The outer surface of the tubular fabric 3 is covered with a coating 4 of a thermoplastic resin such as polyethylene, polypropylene, nylon, polyester, and the tubular fabric 3 is airtight. A laminated member 2 rolled into a tubular shape is inserted inside the tubular fabric 3, and the outer surface of the laminated member 2 is covered with the tubular fabric 3.

  The lining material 1 described above is manufactured as follows, for example. First, glass roving is woven with a plain loom to form a glass roving cloth 5. Next, the glass roving cloth 5 and the spunbond nonwoven fabric 4 are alternately laminated, joined with a needle punch, and cut into a predetermined width to produce a laminated member 2. Next, the laminated member 2 is rounded into a cylindrical shape, the hot melt adhesive 6 is applied to the surface of one end in the circumferential direction, the other end is overlapped, and both ends are joined. And after drawing the cylindrical laminated member 2 in the cylindrical fabric 3, the whole is impregnated with the thermosetting resin liquid.

  The resin liquid impregnation method may be a general method of squeezing the lining material into which the resin liquid is injected with a nip roller, but from the viewpoint of uniformly impregnating the resin with the laminated member 2, the following method is used. It is preferable to adopt. That is, by using a resin liquid whose viscosity is lower than that generally used (viscosity that hangs down at room temperature), and transporting the lining material 1 after injecting the resin liquid to a high position, The laminated member 2 can be uniformly impregnated with the resin liquid while dropping the excess resin liquid adhering to the lining material 1 by gravity. In addition, the resin impregnation process is simplified as compared with the case where the lining material 1 is squeezed with a nip roller. In addition, when conveying the lining material 1 after this resin impregnation, since a low-viscosity resin liquid may drip, a thickening treatment (for example, heating or cooling) according to the type of the resin liquid is performed. It is preferable to transport the resin in a state where the viscosity of the resin is increased.

Next, a method for repairing the existing pipeline P using the above-described lining material 1 will be described.
First, it installs in the pipe line P, applying a fluid pressure to the lining material 1 impregnated with the thermosetting resin liquid to invert the inner and outer surfaces (installation step). FIG. 4 is a view of the lining material 1 in the middle of reversal as viewed from the length direction. 5A and 5B are diagrams showing the lining material 1 after reversal (after installation in the pipeline), in which FIG. 5A is a cross-sectional view, and FIG. 5B is an enlarged view of an oval portion A of FIG.

  In this installation process, as described above, since both ends of the laminated member 2 are joined (temporarily joined) by the hot melt adhesive 6, both ends of the laminated member 2 are displaced when the inner and outer surfaces of the lining material 1 are reversed. Spread. When the inner and outer surfaces of the lining material 1 are reversed and drawn into the pipe P, the inner and outer positions of the laminated member 2 and the tubular fabric 3 are reversed as shown in FIG. The inner surface of 2 is covered with the tubular fabric 3.

  Next, while the lining material 1 is heated to a curing temperature (for example, 80 to 100 ° C.) or higher of the thermosetting resin liquid, the lining material 1 is pressurized by applying an internal pressure to the lining material 1 by fluid pressure or the like. The diameter is made to adhere to the inner surface of the pipe P and the thermosetting resin liquid is cured (heating and pressing step). 6A and 6B are diagrams showing the lining material 1 after the heating and pressing step, in which FIG. 6A is a cross-sectional view, and FIG. 6B is an enlarged view of an elliptical portion B of FIG. The heating and pressurizing step can be performed, for example, by installing a tube inside the lining material 1 and expanding the tube by supplying a fluid such as heated air or steam.

  In this heating and pressurizing step, the lining material 1 (laminated member 2) is heated to the curing temperature (for example, 80 to 100 ° C.) of the thermosetting resin, so that the both ends of the laminated member 2 are temporarily joined. The joining force of the melt adhesive 6 is reduced, and both end portions in the circumferential direction of the laminated member 2 can be slid. The hot melt adhesive 6 may be appropriately selected according to the curing temperature of the thermosetting resin liquid. At the same time, by applying an internal pressure to the lining material 1, the diameter of the lining material 1 is increased and brought into close contact with the inner surface of the pipe P, and in this state, the curable resin liquid is thermally cured. Thereby, a strong lining structure in which the thermosetting resin is reinforced by the high-strength glass roving cloth 5 is constructed on the inner surface of the pipe P.

  In the present embodiment, a large tensile force is likely to act on the laminated member 2 when the inner and outer surfaces of the lining material 1 are reversed in the installation step described above. Further, in the heating and pressurizing step, when both ends in the circumferential direction of the laminated member 2 slide and the laminated member 2 expands in diameter, a large frictional force is likely to act on the both end portions. Thus, when a large external force is applied to the laminated member 2, misalignment is likely to occur in the glass roving cloth 5. However, in the lining material 1 of the present embodiment, the nonwoven fabric 4 is superimposed on the glass roving cloth 5 and joined by needle punching. Since the nonwoven fabric 4 has a structure in which long fibers are intertwined, when an external force acts on the glass roving cloth 5, the nonwoven fabric 4 joined to the glass roving cloth 5 is used to form the glass fibers constituting the glass roving cloth 5. Resistance is imparted, and displacement of the glass fiber, that is, misalignment of the glass roving cloth 5 is suppressed.

  In addition, as described above, when a plurality of glass roving cloths 5 are cut out from one large glass roving cloth when the lining material 1 is manufactured, fiber fraying occurs at the cut ends of the glass roving cloths 5. Although it is likely to occur, fraying of the end portion of the glass roving cloth 5 is prevented by the nonwoven fabric 4 being superimposed on the glass roving cloth 5.

  Furthermore, in this embodiment, since the nonwoven fabric 4 is piled up on both surfaces of the glass roving cloth 5, and the glass roving cloth 5 is sandwiched between two layers of the nonwoven fabric 4, the glass roving cloth is joined by the needle punch. 5 misalignment and fraying of the end are further suppressed.

  In addition, in a state where the lining material 1 is in close contact with the inner surface of the pipe line P, the overlapping amount of both end portions is ensured to be a certain level or more so that the strength is not locally reduced at both end portions of the stacked laminated member 2. Is preferred. Specifically, the overlapping amount a (the circumferential length of the overlapping portion) of the laminated member 2 shown in FIG. 6B is preferably 6% or more of the inner circumferential length of the pipe P (Examples below). reference). For that purpose, if the circumferential length of the laminated member 2 rolled into a cylindrical shape (the width of the sheet-like laminated member 2 in FIG. 2A) is 1.06 times or more of the inner circumferential length of the pipe P. Good.

  Next, specific examples of the present invention will be described. Here, in particular, an appropriate amount of overlap at both ends of the laminated member was examined. The specifications of the laminated member, cylindrical woven fabric, hot melt adhesive, and thermosetting resin used in the test piece preparation of this example are shown below.

[Laminated member]
a) spun bonded nonwoven fabric: 70 g / m @ 2 basis weight polyester spunbond b) glass roving cloth: anti SANGA La thrown Bing cloth (basis weight) 1600 g / m @ 2
(Warning) 4800tex, density 4.5 / 25mm
(Weft) 4800tex, density 4.3 / 25mm
(Weaving structure) Plain weave c) Lamination form: 3 layers of spunbond nonwoven fabric and 2 layers of glass roving cloth are laminated alternately d) Number of penetrations (number of needle punches per 1 cm 2): 30

[Tubular woven fabric]
(Warning) TBY1000T / 2 × 800
(Weft) TBY1000T / 2
(Resin coating) Polyester elastomer [Hot melt adhesive]
Hot melt adhesive EP-65 manufactured by MORESCO
[Thermosetting resin]
Partembond P-SK-414P manufactured by Kashimori Industry Co., Ltd.

  Then, the laminated member is rolled up, both ends are overlapped, and both ends are temporarily joined with a hot melt adhesive, and then inserted into a tubular woven fabric, and further impregnated with a thermosetting resin solution to obtain a resin solution. Was cured to prepare a cylindrical test piece. In this case, a laminated member having a width equal to or greater than the pipe circumference (π × 250 (mm) = 785 (mm)) was used in consideration of installing the lining material in the pipe having a diameter of 250 mm. . Furthermore, the appropriate range of the amount of overlap was verified by performing a tensile test and a crush test on four types of test pieces (Examples 1 to 4) having different end overlap amounts of the laminated members.

  The tensile test was performed in accordance with JIS K7037 (plastic piping system-glass reinforced thermosetting plastic (GRP) pipe-determining the apparent initial circumferential tensile strength). Moreover, about the crushing test, it performed according to Japan Sewerage Association JSWAS K-2 fracture external pressure test. In addition, in the tensile test and the crushing test, the overlapping part of the laminated members was placed on the side (3 o'clock position) or on the upper side (12 o'clock position). Tables 1 and 2 show the results of the tensile test and the compression test, respectively.

(Discussion)
As shown in Tables 1 and 2, in Examples 2 to 4 where the pipe circumference ratio of the overlap amount is 6% or more in the tensile test and the crushing test, the pipe circumference ratio is 3%. Compared to Example 1, the strength (tensile strength, bending strength, compressive strength) is considerably large. In addition, the inner diameter of the pipe to be repaired is not constant in the length direction of the pipe, and there are actually variations. It is preferable to keep it.
From the above, it can be said that the peripheral length of the laminated member when rolled into a cylindrical shape is preferably 1.06 times or more of the pipe peripheral length.

  Next, modified embodiments in which various modifications are made to the embodiment will be described. However, components having the same configuration as in the above embodiment are given the same reference numerals and description thereof is omitted as appropriate.

1] The laminated member 2 of the above embodiment has a configuration in which the nonwoven fabric 4 is superimposed on both surfaces of the glass roving cloth 5 and the glass roving cloth 5 is sandwiched between the two layers of nonwoven fabric 4. Even if the nonwoven fabric 4 is overlapped only on one side of the glass, the effect of preventing misalignment of the glass roving cloth 5 or preventing fraying of the end can be obtained.

2] Although the above embodiment is an example in which the lining material of the present invention is applied to a so-called reversal method in which the inner and outer surfaces are reversed and installed in the pipe P, the lining material of the present invention has an inner and outer surface. It can also be applied to a construction method in which the pipe P is directly pulled into the pipe P without being inverted. When applied to this construction method, a lining material is produced as follows. First, the laminated member of the present invention is placed in the center of the sheet-like outer layer film, and the expansion tube is positioned at the approximate center of the laminated member. Stop with glue. Next, the outer layer film is folded and both end portions in the width direction are melt bonded. By injecting the resin from one end of the lining material thus produced, the laminated member sandwiched between the outer layer film and the expansion tube is impregnated with the resin, and then drawn into the conduit. Also in this construction method, a large external force (tensile force) acts locally on the glass roving cloth 5 of the laminated member 2 at the time of drawing into the pipe P or expanding the diameter of the laminated member 2, but the glass roving cloth 5 Since the nonwoven fabric 4 is overlapped and bonded to each other, misalignment of the glass roving cloth 5 is prevented.

3] The woven fabric made of glass fibers constituting the laminated member is not limited to a glass roving cloth made of glass roving in which glass fibers are aligned, and glass cloth woven with twisted glass yarn can also be used.

4] The curable resin liquid impregnated in the lining material 1 is not limited to a thermosetting material, and a photocurable material and a room temperature curable material can also be used. However, when both ends in the circumferential direction of the laminated member 2 are temporarily joined by the hot melt adhesive 6 as in the above-described embodiment, the curable resin liquid is cured and the hot melt adhesive 6 is softened (joining release). It is preferable to employ a thermosetting resin liquid so that the above can be performed at once.

5] Although the above embodiment is an example in which a lining material is used when repairing an existing pipe line, a lining material can be installed to reinforce the pipe line regardless of existing or new installation.

DESCRIPTION OF SYMBOLS 1 Lining material 2 Laminated member 4 Spunbond nonwoven fabric 5 Glass roving cloth 6 Hot-melt-adhesive P Pipe line

Claims (6)

A lining material for a pipeline that is drawn into the pipeline while the inner and outer surfaces are reversed by fluid pressure,
In the state where the nonwoven fabric of organic fiber and the fabric made of glass fiber overlap , a needle punch laminated member rolled into a cylindrical shape,
A tubular fabric having airtightness covering the outer surface of the tubular needle punch laminated member; and
Including
The needle punch laminated member is joined by a hot melt adhesive in a state where both circumferential ends thereof are overlapped,
The hot-melt adhesive is partially provided at a circumferential end of the needle punch laminated member rounded into a cylindrical shape and divided into a plurality of elongated regions parallel to the cylindrical length direction. Liner lining material. 2. The conduit lining material according to claim 1, wherein the needle punch laminated member has a structure in which the nonwoven fabric is superimposed on both surfaces of a woven fabric made of the glass fiber.   The lining material for a pipe line according to claim 1 or 2, wherein the woven fabric made of glass fibers is a glass roving cloth. The pipe liner according to any one of claims 1 to 3, wherein the peripheral length of the needle punch laminated member is 1.06 times or more of the pipe peripheral length. A pipeline lining method using the pipeline lining material according to claim 1,
The lining material is impregnated with a curable resin liquid in a state where the needle punch laminated member is rolled into a cylindrical shape and both circumferential ends thereof are overlapped,
An installation step of installing the lining material in a pipeline while reversing its inner and outer surfaces by fluid pressure;
The lining material is heated and pressurized from the inside, and the curable resin liquid is cured while the lining material is in close contact with the inner surface of the pipe line while sliding both ends in the circumferential direction of the needle punch laminated member. Pressure process,
A method for lining a pipeline, comprising: 6. In the heating and pressurizing step, the joining of the both ends in the circumferential direction of the needle punch laminated member by the hot melt adhesive is released by heating the lining material and applying pressure from the inside. The lining method of the pipe line as described in 2.

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