JP2004050659A - Liner material for conduit and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To ensure air-tightness of a skin layer at sewn part, and to form an liner which is surely air-tight for an liner material comprising a non-woven fabric which is sewn into a cylindrical shape, and the air-tight coating layer which is formed on the surface of the non-woven fabric. <P>SOLUTION: This liner material 7 is manufactured by forming the air-tight coating layer 13 on the external surface of the cylindrical non-woven fabric 8 formed by sewing the side edges of a sheet-like non-woven fabric 9 to each other. In the liner material 7, a strip-like cloth 11 is bonded to the outside of the sewn part of the cylindrical non-woven fabric 8 while keeping air-permeability. Then, the coating layer 13 is formed on the outside of the strip-like cloth 11. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a lining material for lining pipes mainly buried in the ground, such as gas pipes, water pipes, sewer pipes, laying pipes such as power lines and communication lines, for repair or reinforcement purposes. It is about.
[0002]
[Prior art]
The lining material of these pipelines must be airtight so as to prevent the internal fluid from leaking from the damaged portion of the pipeline. When there is a partially missing portion in the pipeline, the lining material is required to have considerable strength in order to cover the missing portion and secure an internal flow path.
[0003]
As a structure of such a lining material, a structure in which an airtight coating layer is formed on a surface which becomes an inner surface in a lining state of a tubular nonwoven fabric is known. Since it is difficult to manufacture a non-woven fabric as a tubular one, it has been practiced to roll a sheet-like non-woven fabric into a tubular shape and form a coating layer thereon.
[0004]
For example, in Japanese Patent Publication No. 58-33098, as shown in FIG. 2, an airtight coating layer 2 is formed on one surface of a sheet-like nonwoven fabric 1 and then rounded into a cylindrical shape so that the coating layer 2 is on the outside. A lining material 5 is shown in which both side edges are sewn together and an airtight narrow ribbon 4 is adhered to the surface of the sewn portion 3. The lining material 5 is inserted inside the pipe while being turned upside down to line the inside.
[0005]
In Japanese Patent Application Laid-Open No. Hei 7-304099, as shown in FIG. 3, a sheet-like nonwoven fabric 1 is rolled into a tubular shape and both edges thereof are sewn, and a tubular synthetic resin film layer 2 is extruded on the surface thereof. It is described that a thick portion 6 is formed by unifying and making the thickness of the coating layer 2 in the sewn portion 3 larger than other portions. This is also turned inside out while being inserted into the pipeline while turning over.
[0006]
[Problems to be solved by the invention]
However, in the lining material 5 described in JP-B-58-33098, the airtightness of the sewn portion 3 is maintained by the ribbon 4 attached to the sewn portion 3, so that the Poor adhesion may result in leakage of internal fluid. Particularly, in the lining state, since the ribbon 4 is adhered to the inside of the sewn portion 3, the ribbon may be peeled off by the pressure of groundwater or the like that has entered from a damaged portion of the pipeline, and the airtightness may be lost.
[0007]
When the lining material 5 is lined on the inner surface of the pipeline, the lining material 5 is slightly expanded in diameter. At this time, the sewn portion 3 is opened, and the ribbon 4 stuck over the sewn portion 3 is attached. Tension acts in the width direction. Therefore, there is a possibility that the ribbon 4 is peeled off in combination with the external pressure due to the groundwater or the like.
[0008]
Further, in the lining material 5 described in Japanese Patent Application Laid-Open No. 7-304099, since the synthetic resin tube in which the coating layer 2 of the sewn portion 3 is thick is covered as described above, 3, the airtightness is ensured, and underground water does not infiltrate, but when extruding the tube, the sewn portion 3 of the tubular nonwoven fabric and the thick portion 6 of the coating layer 2 exactly match. If the tubular nonwoven fabric is twisted during molding, the sewn portion 3 and the thick portion 6 may not match, and the effect of providing the thick portion 6 on the coating layer 2 may be lost.
[0009]
That is, when covering the surface of the tubular nonwoven fabric with the synthetic resin tube, the tubular nonwoven fabric sewn into the tubular shape is passed through an extruder, and the synthetic resin tube is extruded and adhered to the surface of the tubular nonwoven fabric. And the coating layer 2.
[0010]
At this time, in order to improve the adhesion of the tube to the tubular nonwoven fabric, the pressure is reduced from the inside of the tubular nonwoven fabric. , And the trace of the needle in which the suture is sewn in the sewn portion 3 also has air permeability.
[0011]
Therefore, when the pressure is reduced from the inside of the tubular nonwoven fabric, the tube is strongly sucked inward at the stitching portion of the sheet nonwoven fabric 1 and the position of the needle mark at the sewn portion 3, and the portion is displaced from the thick portion of the tube. In this case, there is a possibility that a pinhole is generated in the coating layer 2 because the film is strongly sucked locally.
[0012]
When a pinhole is formed in the coating layer 2, not only does the fluid leak from the pinhole, but also when the butt portion is opened during lining as described above, the coating layer 2 is torn by the pinhole and the airtightness is reduced. Risk of loss.
[0013]
The present invention has been made in view of such circumstances, and in a lining material composed of a nonwoven fabric sewn into a tubular shape and an airtight film layer formed on the surface thereof, the airtightness of the film layer at the sewn portion is improved. It is intended to secure and surely form an airtight lining.
[0014]
[Means for Solving the Problems]
Thus, the pipe lining material of the present invention is a lining material formed by forming an airtight coating layer on the outer surface of a tubular non-woven fabric formed by stitching between side edges of a sheet-like non-woven fabric. The belt-like cloth is adhered to the outside of the sewn portion while maintaining air permeability, and the coating layer is formed outside the belt-like cloth.
[0015]
In this lining material, it is preferable that the sewn portion of the tubular nonwoven fabric and the band-shaped fabric are bonded in a dotted or linear manner. As the means, for example, the sewn portion of the tubular nonwoven fabric and the belt-like fabric can be bonded with a powdery or granular adhesive. The powdery or granular adhesive is preferably made of a thermoplastic resin.
[0016]
Further, as another means for bonding the tubular nonwoven fabric and the belt-like fabric in a dot-like or linear manner, irregularities are formed on the surface of the belt-like fabric facing the tubular nonwoven fabric, and the irregularities are bonded to the tubular nonwoven fabric at the convex portions. You can also.
[0017]
In addition, the method for producing a pipe liner according to the present invention comprises forming a tubular nonwoven fabric by suturing between side edges of a sheet-like nonwoven fabric, and maintaining the gas permeability of the band-like fabric on the outside of a sewn portion of the tubular nonwoven fabric. And then forming a coating layer by covering the outside of the tubular nonwoven fabric with a plastic tube, depressurizing the inside of the tubular nonwoven fabric, and bonding the plastic tube to the tubular nonwoven fabric. It is.
[0018]
In the invention of the manufacturing method of the lining material, an adhesive is interposed in a dotted or linear manner on the surface of the band-shaped fabric facing the tubular non-woven fabric and / or outside the stitched portion of the tubular non-woven fabric, and the bonding is performed. It is preferable to bond the band-shaped fabric to the sewn portion of the tubular nonwoven fabric by heating the agent while maintaining air permeability.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a part of a lining material 7 of the present invention. Reference numeral 8 denotes a tubular nonwoven fabric formed by rolling a sheet-like nonwoven fabric 9 into a cylindrical shape and sewing both side edges thereof with a suture thread 10.
[0020]
In this tubular nonwoven fabric 8, the sheet-like nonwoven fabric 9 may be composed of only the nonwoven fabric, but the woven fabric is integrally joined to the outer surface, the inner surface or the thickness of the nonwoven fabric to control the tensile strength and elongation. Can also be used.
[0021]
This sheet-like nonwoven fabric 9 is rolled into a cylindrical shape, butted on both side edges, and sewed together with a suture thread 10 to form a tubular nonwoven fabric 8. The structure of the stitching is not particularly limited, and the side edges of the sheet-like nonwoven fabric 9 may be overlapped and stitched. In any case, both side edges of the sheet-like nonwoven fabric 9 are firmly sewn so that the joint does not open excessively when the lining material 7 is expanded at the time of lining.
[0022]
In the drawings, one sheet-like nonwoven fabric 9 is rolled into a cylindrical shape and both side edges are stitched at one place. However, if the width of the sheet-like nonwoven fabric 9 is not sufficient, two sheets are used. The sheet-shaped nonwoven fabric 9 may be formed into a tubular shape by suturing between the side edges, and the tubular nonwoven fabric 8 may be formed with a plurality of sewn portions.
[0023]
Thus, a band-shaped fabric 11 is bonded to the outside of the stitched portion of the tubular nonwoven fabric 8. The band-like cloth 11 can be a woven cloth or a non-woven cloth tape. The band-like cloth 11 is adhered to the outside of the seam of the tubular non-woven cloth 8 so as to maintain the gas permeability of the band-like cloth 11.
[0024]
In the example of FIG. 1, as a means for the bonding, a powdery or granular adhesive 12 made of a thermoplastic synthetic resin is sandwiched between the band-shaped fabric 11 and the stitched portion of the tubular nonwoven fabric 8, and heated to bond. The agent 12 is melted and adhered in a point-like manner, so that the air permeability of the band-shaped fabric 11 is maintained in a portion between the adhesives 12.
[0025]
As the adhesive 12, a thermosetting adhesive can also be used. That is, a thermosetting resin liquid is applied as an adhesive to the stitched portion of the tubular nonwoven fabric 8 in a dotted or linear manner, and the belt-shaped cloth 11 is laminated and the adhesive is cured to bond in a dotted or linear manner, The band-shaped fabric 11 can be bonded while maintaining the air permeability.
[0026]
Further, as another means, by forming irregularities on the bonding surface of the band-shaped fabric 11 and bonding the convexities of the irregularities to the tubular nonwoven fabric 8 in a dotted or linear manner, it is possible to maintain air permeability in the concave portions. .
[0027]
The unevenness of the belt-like cloth 11 may be an irregularity inevitably generated by the floating and sinking of the yarn when the belt-like cloth 11 is a woven cloth. By performing embossing on the surface, irregularities can be formed.
[0028]
An airtight coating layer 13 made of a synthetic resin is formed on the outer surface of the tubular nonwoven fabric 8. The coating layer 13 is formed by sticking a tube formed by extruding a synthetic resin to the outside of the tubular nonwoven fabric 8, and is continuously attached to the outside of the band-shaped fabric 11 at the sewn portion. I have.
[0029]
The belt-like fabric 11 in the present invention is used to prevent the coating layer 13 from being excessively strongly sucked from the abutting portion or the needle mark of the sheet-like nonwoven fabric 9 by being sucked from the inside of the tubular nonwoven fabric 8 and being damaged. Therefore, the thickness is preferably as thin as about 0.1 to 2 mm, and the width is suitably about 2 to 5 times the suture width of the suture thread 10.
[0030]
In order to manufacture the lining material 7 of the present invention, the band-shaped fabric 11 is adhered to the outside of the sewn portion of the tubular non-woven fabric 8 formed by suturing between both side edges of the sheet-shaped non-woven fabric 9 while maintaining air permeability. Is passed through the head of the extruder, a synthetic resin tube is extrusion-molded outside the tubular non-woven fabric 8 at the head, and the inside of the tubular non-woven fabric 8 is depressurized. The coating layer 13 is formed by being adhered to the surface and integrally adhered.
[0031]
As another method for manufacturing the lining material 7, a synthetic resin tube molded in advance is placed on the outside of the tubular nonwoven fabric 8, and the synthetic resin tube is heated from the inside of the tubular nonwoven fabric 8 while reducing the pressure. It can also be glued to.
[0032]
[Action]
In the present invention, by providing the band-shaped fabric 11 outside the stitched portion in the tubular nonwoven fabric 8, the band-shaped fabric 11 supports the synthetic resin tube when the pressure is reduced from the inside of the tubular nonwoven fabric 8, and the soft synthetic resin immediately after extrusion is provided. The tube is prevented from being excessively sucked through the butted portion and the needle mark of the sheet-like nonwoven fabric 9.
[0033]
Further, in the present invention, since the belt-like fabric 11 is bonded to the tubular non-woven fabric 8 while maintaining air permeability, when the inside of the tubular non-woven fabric 8 is decompressed, the decompression is also applied to the outside through the belt-like fabric 11. Acting, the synthetic resin tube is tightly adhered to the surface of the belt-like cloth 11 in close contact.
[0034]
【The invention's effect】
Therefore, according to the present invention, since the coating layer 13 is formed on the outer side of the tubular non-woven fabric 8, the ribbon is applied to the sheet-like non-woven fabric having the air-tight layer in a tubular shape, and the ribbon is stuck to the abutting portion. The airtight lining can be reliably formed on the inner surface of the conduit without peeling off the airtightness or impairing the airtightness due to the adhesion failure.
[0035]
In addition, since the coating layer 13 itself has a uniform thickness as a whole and does not vary in partial thickness, it is necessary to consider the displacement of the tubular nonwoven fabric 8 when extruding the synthetic resin tube forming the coating layer 13. There is no.
[0036]
Since the band-like cloth 11 is adhered to the outer side of the sewn portion of the tubular nonwoven fabric 8, the synthetic resin tube is partially excessively sucked through the butted portion of the sheet-like nonwoven fabric 9 or the needle mark at the sewn portion. Also, there is no possibility that the airtightness is impaired due to the occurrence of pinholes in the coating layer 13.
[0037]
Further, when the band-shaped fabric 11 is bonded to the entire surface of the tubular nonwoven fabric 8, the adhesive layer impairs the air permeability of the band-shaped fabric 11, and a suction force is applied to the synthetic resin tube at the portion where the band-shaped fabric 11 is bonded. Does not act, and it may not be possible to properly adhere to the tubular nonwoven fabric 8.
[0038]
On the other hand, in the present invention, since the band-like fabric 11 is bonded to the tubular non-woven fabric 8 while maintaining the air permeability, the suction force acts on the synthetic resin tube on the outside through the band-like fabric 11, so that it is ensured. Adhered to.
[0039]
When lining a pipe using a lining material, the tubular nonwoven fabric 8 is impregnated with a curable resin liquid such as an unsaturated polyester resin. Since the curable resin liquid is held, the curable resin liquid can penetrate and impregnate the band-shaped cloth 11, and the sewn portion of the tubular nonwoven fabric 8 after lining is integrated with the band-shaped cloth 11 by the curable resin. As a result, the strength at the suturing portion does not extremely decrease.
[0040]
Therefore, according to the present invention, in the lining material 7 in which the airtight coating layer 13 is formed on the outside of the tubular nonwoven fabric 8, various problems due to the unavoidable seam portion of the tubular nonwoven fabric 8 can be solved at once. Can be reliably repaired or reinforced.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a main part of a lining material of the present invention. FIG. 2 is a perspective view showing a state of manufacturing a conventional lining material. FIG. 3 is a cross-sectional view of a main part of another conventional lining material. Explanation of code]
7 Lining material 8 Cylindrical non-woven fabric 9 Sheet-shaped non-woven fabric 11 Strip-shaped fabric 12 Adhesive 13 Coating layer

Claims (7)

In a lining material (7) formed by forming an air-tight coating layer (13) on the outer surface of a tubular nonwoven fabric (8) formed by stitching between side edges of a sheet-like nonwoven fabric (9), the tubular nonwoven fabric (8) A) a band-like cloth (11) is adhered to the outside of the stitched portion while maintaining air permeability, and the coating layer (13) is formed outside the band-like cloth (11). Lining material The liner according to claim 1, characterized in that a stitched portion of the tubular nonwoven fabric (8) and the band-shaped fabric (11) are adhered in a dot-like or linear manner. The liner according to claim 2, characterized in that the seam of the tubular non-woven fabric (8) and the band-shaped fabric (11) are adhered to each other with a powdery or granular adhesive (12). Lumber 4. Line lining according to claim 3, characterized in that the powdery or granular adhesive (12) consists of a thermoplastic resin. 3. The belt-like fabric (11), wherein irregularities are formed on a surface facing the cylindrical nonwoven fabric (8), and the convexities of the irregularities are adhered to the cylindrical nonwoven fabric (8). A lining material for a pipeline according to 3 or 4 A tubular non-woven fabric (8) is formed by suturing the side edges of the sheet-like non-woven fabric (9), and a band-shaped fabric (11) is adhered to the outside of the sewn portion of the tubular non-woven fabric (8) while maintaining air permeability. Then, a plastic tube is put on the outside of the tubular non-woven fabric (8), and the inside of the tubular non-woven fabric (8) is decompressed to adhere the plastic tube to the tubular non-woven fabric (8). ), A method for producing a pipe liner An adhesive (12) is interposed in the form of a dot or a line on the surface of the band-shaped cloth (11) facing the cylindrical non-woven fabric (8) and / or on the outside of the stitched portion of the cylindrical non-woven fabric (8). The liner according to claim 6, characterized in that the band-like fabric (11) is adhered to the sewn portion of the tubular nonwoven fabric (8) by heating the adhesive (12) while maintaining air permeability. Material manufacturing method

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