JP2017043074A - Pipe lining material, pipe lining material manufacturing method, and pipe lining method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe lining material which is capable of securely and easily joining both ends of a belt-like nonwoven fabric and also capable of maintaining a favorable strength without requiring complicated mechanical equipment.SOLUTION: In a pipe lining material 1, an overlapping part 5 of a tubular body 6 formed by overlapping both ends of a belt-like nonwoven fabric 2 and a counter part 7 facing the overlapping part 5 are joined by needle punching.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pipe lining material used for repairing an aged existing pipe, a manufacturing method thereof, and a pipe lining method.

  Conventionally, pipe lining materials have been used to repair pipelines such as aging agricultural waterways, water pipes, sewage pipes, gas pipes and the like. The pipe lining material is produced by molding a strip-shaped non-woven fabric into a tubular shape. This pipe lining material is inserted into an existing pipe line that needs to be repaired, and the pipe lining material is inserted into the inner wall of the existing pipe line by fluid pressure. The thermosetting resin impregnated in the nonwoven fabric is cured in this pressed state. Thereby, the pipe-shaped resin cured material is formed on the inner surface of the existing pipe line to extend the life of the pipe line.

  Patent Literatures 1 to 4 describe conventional pipe lining materials. These gazettes all form a tubular body by aligning both end portions of a strip-shaped nonwoven fabric in a side-by-side manner, and stitching the aligned end portions along the length direction, welding, bonding, and needle bonding to form a pipe lining It is a material.

Japanese Patent Laid-Open No. 10-235736 JP-A-4-59227 JP-T 56-501355 Japanese Patent Laid-Open No. 48-24468

  As described in the prior art, in a method in which both ends of the belt-shaped nonwoven fabric are sewn in a state of being aligned side by side and processed into a tubular shape, the stitched portion becomes a weak point. In the construction of the lining, since the pipe lining material is pressurized and expanded into a tubular shape, the stitched portion is in an open state, and when cured in this state, there is no nonwoven fabric in the open stitched portion, and only the suture thread, Not only does the strength decrease extremely, but also the strength of the entire cured tubular body decreases. For this reason, after stitching both ends of the nonwoven fabric, it is necessary to affix a ribbon-like reinforcing nonwoven fabric to the stitched portion. For this reason, there exists a problem which manufactures a pipe lining material becomes troublesome.

  On the other hand, when performing bonding by welding, adhesion, needle bonding, etc. instead of stitching, the alignment process of aligning both ends of the belt-shaped nonwoven fabric in a side-by-side configuration and the bonding process of combining the aligned both ends are simultaneously performed. There is a need. For this reason, there is a problem that skill is required for the worker. There is a problem that complicated mechanical equipment is required to perform the aligning process and the joining process at the same time even when the process is performed by a machine rather than by human power. Further, in the production of a tubular body having a diameter exceeding 300 mm, the weight is increased, and accordingly, a large-sized machine facility is required.

  The present invention has been made in consideration of such circumstances, and it is possible to reliably and easily bond both end portions of a strip-shaped nonwoven fabric, and to maintain a good strength, and to provide complicated mechanical equipment. It is an object of the present invention to provide a pipe lining material, a method for manufacturing a pipe lining material, and a pipe lining method that eliminate the need for the pipe lining.

  The tube lining material of the present invention is characterized in that the overlapping portion of the tubular body formed by overlapping both ends of the belt-shaped nonwoven fabric and the facing portion facing the overlapping portion are joined by needle punching. .

  Further, the pipe lining material of the present invention is a tubular body formed by overlapping both end portions of a strip-shaped nonwoven fabric, and an inner member in which the overlapping portion and the facing portion facing the overlapping portion are joined by needle punching, The inner member is provided with an outer member in which both ends of the belt-shaped nonwoven fabric are overlapped in a state of being wrapped in a tubular shape with another belt-shaped nonwoven fabric, and the overlapping portion and the facing portion facing the overlapped portion are joined by needle punching. The needle coupling portion of the inner member and the needle coupling portion of the outer member are offset from each other.

  In this case, it is preferable that the needle coupling portion coupled by the needle punching is released by expanding the tubular body.

  Moreover, it is preferable that the taper part cut diagonally is formed in the both ends of the said strip | belt-shaped nonwoven fabric, and the said taper part is an overlap part.

  In the method for producing a pipe lining material of the present invention, a tubular body is formed by overlapping both end portions of a belt-shaped nonwoven fabric, and the overlapped portion of the tubular body and the facing portion facing the overlapped portion are joined by needle punching. It is characterized by that.

In this case, it is preferable that a tubular tube is inserted into the tubular body, and fluid pressure is applied to the tubular tube to release the needle coupling portion coupled by the needle punching process.
In addition, a liquid thermosetting resin is injected into the tubular body to impregnate the belt-shaped non-woven fabric with the thermosetting resin, and the diameter of the tubular body is expanded by the liquid thermosetting resin to join the needle. It is preferable to release the part.

  In the method for producing a pipe lining material of the present invention, a tubular body is formed by overlapping both end portions of a strip-shaped nonwoven fabric, and the overlapped portion of the tubular body and the facing portion facing the overlapped portion are joined by needle punching. The inner member is formed, and then the both ends of the belt-shaped nonwoven fabric are overlapped in a state where the inner member is wrapped in a tubular shape with another belt-shaped nonwoven fabric, and the overlapping portion is set at a position offset from the overlapping portion of the inner member. The outer member is formed by combining the overlapping portion and the facing portion facing the overlapping portion at this offset position by needle punching.

  In this case, it is preferable that both end portions of the belt-shaped nonwoven fabric are cut obliquely to form a tapered portion, and the tapered portion is overlapped to form an overlapped portion.

  In the pipe lining method of the present invention, the outer surface of the above pipe lining material is covered with a plastic sheet in an airtight manner, a strip-shaped nonwoven fabric is impregnated with a liquid thermosetting resin, and then inserted into an existing pipe line, and fluid pressure is applied. The thermosetting resin is cured in this state by being brought into close contact with the inner wall surface of the existing pipeline.

  In the present invention, both end portions of the belt-shaped nonwoven fabric are overlapped to form an overlapped portion, and the overlapped portion is joined by needle punching. In addition, the strength can be maintained. In addition, since the overlapped portion and the facing portion of both ends of the belt-shaped nonwoven fabric are needle punched, it is not necessary to simultaneously advance the overlap of both ends and the needle connection of the overlapped portion. For this reason, mechanical equipment can be simplified.

It is sectional drawing which shows the pipe lining material of 1st Embodiment of this invention. (A)-(C) are sectional drawings which show manufacture of a pipe lining material in order of a process. It is a side view which shows an example of the needle used for needle punch processing. It is sectional drawing which shows the pipe lining material of another example of 1st Embodiment. It is sectional drawing which shows the state which cancels | releases a needle coupling part with a tubular tube. It is sectional drawing which shows the state which cancels | releases a needle coupling part. It is sectional drawing which shows the pipe lining material of 2nd Embodiment of this invention. It is a partially broken perspective view which shows the pipe lining material of 3rd Embodiment of this invention. It is a partially broken perspective view which shows the pipe lining material of 4th Embodiment of this invention. It is a partially broken perspective view which shows the pipe lining material of 5th Embodiment of this invention. It is sectional drawing which shows the pipe lining material of the form using a reinforcing material. It is sectional drawing which shows the state which manufactures the pipe lining material of 6th Embodiment of this invention.

(First embodiment)
1 to 4 show a first embodiment of the present invention. FIG. 1 shows a tube lining material 1 according to this embodiment. A tubular body 6 is formed by overlapping both end portions of a strip-shaped nonwoven fabric 2, and the overlapping portions 5 at both end portions of the tubular body 6 are needle-punched. Thus, the pipe lining material 1 is formed.

The band-shaped nonwoven fabric 2 is produced in a band shape by needle punching fibers (threads) such as plastic fibers and glass fibers. Basis weight (weight per 1 m ²⁾ is ^{100g / m 2 ~2500g / m 2} , a thickness of about 0.5 mm to 10 mm, the width is made at about 500Mm～2200mm. The width is set according to the size of the pipe lining material 1. In addition, as the strip-shaped nonwoven fabric 2, a single-layer strip-shaped nonwoven fabric combined with a plastic fiber woven fabric, glass mat, glass cloth, carbon cloth, glass fiber woven fabric, or the like by a needle can also be used.

  FIG. 2 shows the production of the pipe lining material 1 in the order of steps. When the thickness of the main body 3 in the belt-shaped nonwoven fabric 2 is 3.0 mm or more, as shown in (A), both end portions in the width direction are cut obliquely to form the tapered portion 4. For the oblique cutting, for example, a belt cutter peeling machine can be used. By forming such a taper part 4, since the uneven | corrugated | grooved part is eliminated in the outer surface of the pipe lining material 1, the adhesiveness to an existing pipe line can be improved.

  (B) shows the state which made the tubular body 6 by overlapping the both ends (taper part 4) of the strip | belt-shaped nonwoven fabric 2. FIG. The tubular body 6 is not circular but is overlapped with both end portions (tapered portions 4) folded so as to have a flat oval shape. In this case, the two end portions (tapered portion 4) are overlapped so as to be positioned at the upper portion. Reference numeral 5 denotes an overlapping portion at both ends. In the case of overlapping, although not shown, it is preferable to temporarily fix the overlapping portion 5 with a needle and thread, a hot melt adhesive, an up- puncher, or the like. However, the present invention is not limited to this, and a ribbon tape made of a nonwoven fabric / woven fabric or a woven fabric / nonwoven fabric composite may be temporarily fixed by adhering or welding to the overlapping portion 5. Reference numeral 7 denotes a facing portion facing the overlapping portion 5, and in this embodiment, needle punching is performed over the overlapping portion 5 and the facing portion 7.

  (C) shows needle punching. The tubular body 6 is placed on the punching table 10 and set so that the overlapping portion 5 is positioned at the top. Reference numeral 11 denotes a needle plate to which a plurality of needles 8 are attached. The needle plate 11 is lowered to pierce the needle 8 into the overlapping portion 5. The needle plate 11 is lowered so that the needle 8 pierces to the facing portion 7 facing the overlapping portion 5. For example, the needle plate 11 is lowered so that the needle 8 is pierced to a depth of about 3 to 20 mm. The punching speed of the needle 8 at this time is controlled between 100 and 3000 times / minute.

  FIG. 3 shows an example of the needle 8 used for the needle punching process, and it is preferable that the thickness (d) is 0.8 mm or less and the length is 100 mm or less. Although the illustrated needle 8 has a plurality of piercing portions 8b formed in the main body portion 8a, the needle 8 may be omitted from the piercing portion 8b.

  FIG. 4 shows a pipe lining material 1 made of a strip-shaped nonwoven fabric 2 having a thickness of 3.0 mm or less. Since the strip-shaped nonwoven fabric 2 is not thick, the both ends of the strip-shaped nonwoven fabric 2 are not cut diagonally, but the both ends of the thickness are overlapped to form the overlapped portion 5. The pipe lining material 1 is produced by performing needle punching on the overlapping portion 5 and the facing portion 7 facing the overlapping portion 5 to pierce the needle 8 into the overlapping portion 5 and the facing portion 7.

  FIG. 11 shows a form in which a reinforcing material 17 is provided to the pipe lining material 1 produced in FIG. The reinforcing material 17 is arranged so as to cover the upper part of the pierced portion of the needle 8, whereby the reinforcing material 17 overlaps the overlapping portion 5, and can be strongly coupled. The reinforcing member 17 may be arranged by needle punching simultaneously with the overlapping portion 5.

  By the above procedure, the both ends of the strip-shaped non-woven fabric 2 are joined to produce a tubular body 6 as a tubular resin adsorbent. The size of the tubular body 6 as the tubular resin adsorbent can be appropriately selected within the range of 75 mm to 2500 mm in diameter.

  The needle coupling portion 12 in which both end portions of the strip-shaped nonwoven fabric 2 are coupled by needle punching is in a state in which yarns are entangled and coupled to the overlapping portion 5 of the strip-shaped nonwoven fabric 2 and the facing portion 7 facing this. In this state, the tubular body 6 cannot expand in a tubular shape and cannot function as the tube lining material 1. For this reason, it is necessary to release the coupling of the needle coupling portion 12. 5 and 6 show this release operation.

  In FIG. 5, the coupled state is released by inserting a highly airtight tubular tube 13 into the tubular body 6 and supplying the tubular tube 13 with fluid pressure to inflate it. In FIG. 6, the tube lining material 1 is produced by covering the outer surface of the tubular body 6 with a highly airtight tubular film (tubular tube) 14, and after inverting the tube lining material 1, The fluid pressure is supplied to release the needle coupling portion 12. By these operations, the tubular body 6 can function as a pipe lining material.

(Second Embodiment)
FIG. 7 shows a second embodiment of the present invention. The tube lining material (tubular resin adsorbent) 1 of this embodiment has a multilayer structure in which an inner member 22 is disposed inside an outer member 21, and the outer member 21 and the inner member 22 are both formed in a tubular shape. The The belt-shaped nonwoven fabric 2 is used for both the outer member 21 and the inner member 22. The both ends of the belt-shaped nonwoven fabric 2 are overlapped to form an overlapped portion 5, and the overlapped portion 5 and the facing portion 7 facing the overlapped portion 5 are joined by needle punching. The overlapping portion 5 is a tapered portion 4 that is cut obliquely as in the first embodiment.

  In the pipe lining material 1 having a multilayer structure, the needle coupling portion 12 of the outer member 21 and the needle coupling portion 12 of the inner member 22 are offset and shifted so that the needle coupling portion 12 does not overlap. Yes.

Hereinafter, the manufacture of the pipe lining material 1 shown in FIG. 7 will be described. First, the inner member 22 is produced in the same manner as in the first embodiment. Hereinafter, the reference numerals will be described with reference to FIG. That is, both ends (tapered portion 4) of the strip-shaped nonwoven fabric 2 are overlapped to form a tubular body 6, and the overlapping portion 5 of the tubular body 6 and the facing portion 7 facing the overlapping portion 5 are formed by needle punching. The inner member 22 is produced by forming the needle coupling portion 12 by coupling.

  Next, the inner member is wrapped in a tubular shape with another belt-shaped nonwoven fabric 2, and both end portions (tapered portions 4) of the other belt-shaped nonwoven fabric 2 are overlapped. The overlapping portion 5 is adjusted so as to be offset from the overlapping portion 5 of the inner member 22. And the outer member 21 is produced by combining the overlapping part 5 and the facing part 7 facing the overlapping part 5 by needle punching to form the needle connecting part 12.

  In the pipe lining material 1 having such a multilayer structure, the plate thickness can be adjusted. Therefore, the pipe lining material 1 can be suitably applied even when the thickness is required to be 10 mm or more.

(Third embodiment)
FIG. 8 shows a third embodiment of the present invention. In the third embodiment and the fourth embodiment (FIG. 9) and the fifth embodiment (FIG. 10), which will be described later, the pipe lining materials 31, 41, 51 applied to the existing pipeline (not shown) will be described. To do. In these pipe lining materials 31, 41, 51, the outer surface of the tubular body 6 is covered with a plastic sheet 32, 42, 52 in an airtight manner, and the liquid nonwoven fabric constituting the tubular body 6 is impregnated with a liquid thermosetting resin. . As the thermosetting resin, an unsaturated polyester resin, an epoxy resin, a vinyl ester resin, or the like can be used. In this state, application to the existing pipeline is performed.

  In the pipe lining material 31 of the third embodiment, a plastic film coating felt 32 is used as a plastic sheet. The plastic film coating felt 32 wraps the outer surface of the tubular body 6 and stitches both ends 34 of the felt 32 to form a stitched portion 33. After the seam 33 is sealed in an airtight manner, the above-described liquid thermosetting resin is impregnated. Then, in this state, fluid pressure is applied to reversely insert into the existing pipeline, and is brought into close contact with the inner wall surface of the existing pipeline. Thereafter, the impregnated thermosetting resin is cured to restore the existing pipe line.

(Fourth embodiment)
FIG. 9 shows a fourth embodiment of the present invention. In the pipe lining material 41 of this embodiment, a tubular plastic tube 42 is used as the plastic sheet.

  In this embodiment, the tubular body 6 is inserted into the tubular plastic tube 42, and after this insertion, the inside of the plastic tube 42 is decompressed to a negative pressure. In this state, the outside is heated to bring the plastic tube 42 into close contact with the outer surface of the tubular body 6 to form the tube lining material 41. And after making the strip | belt-shaped nonwoven fabric 2 of the tubular body 6 impregnate a liquid thermosetting resin, it draws in in an existing pipe line and arrange | positions the pipe lining material 42 in an existing pipe line. Thereafter, another pipe lining material is inverted and inserted, and the two pipe lining materials are put together and pressed against the inner wall surface of the existing pipe line to be in close contact with each other, thereby curing the thermosetting resin. Thereby, the existing pipeline can be restored.

(Fifth embodiment)
FIG. 10 shows a fifth embodiment of the present invention. The tube lining material 51 of this embodiment uses a plastic tube 52 as a plastic sheet.

  In this embodiment, by expanding the diameter of the tubular body 6, the needle 8 is retracted from the facing portion 7 of the tubular body 6 and the coupling between the overlapping portion 5 and the facing portion 7 is released. And after inserting this tubular body 6 in the plastic tube 52, another plastic tube (illustration omitted) is reversely inserted in the inside of the tubular body 6. FIG. In a state where the plastic tube inserted therein is pressurized and expanded in diameter, the pressure between the outer plastic tube 52 and the tubular body 6 is reduced to bring the plastic tube 52 into close contact with the tubular body 6, and the plastic tube 52 is heated in this tightly contacted state. Then, the tube 52 is welded to the outer surface of the tubular body 6. FIG. 10 shows this state.

  Thereafter, the belt-like nonwoven fabric of the tubular body 6 is impregnated with a liquid thermosetting resin, and in this state, it is inverted and inserted into the existing pipeline. After reversal insertion into the existing pipeline, pressurization is applied to the inner wall surface of the existing pipeline, and the thermosetting resin is cured by heating in this state. Thereby, the existing pipeline can be restored.

(Sixth embodiment)
FIG. 12 shows a sixth embodiment of the present invention. This embodiment demonstrates the form which cancels | releases a needle | hook coupling | bond part using a liquid thermosetting resin.

  First, as in the first embodiment, the needle coupling portion 12 is formed by the needle 8 by performing needle punching on the overlapping portion 5 at both ends of the belt-shaped nonwoven fabric 2 and the facing portion 7 of the overlapping portion 5 to form a tubular shape. Create a body 6. After the tubular body 6 is inserted into the tubular plastic tube 42, a liquid thermosetting resin 61 is injected into the inside from one end side of the tubular body 6.

  FIG. 12 shows this state, and the injection nozzle 62 is made to face one end side of the tubular body 6 covered with the plastic tube 42. Further, a vacuum pad 63 penetrating the plastic tube 42 is connected to the other end of the tubular body 6 on the side opposite to the injection nozzle 62. The vacuum tube 63 is connected to a vacuum pump 64, and the vacuum pump 64 draws out the air inside the tubular body 6 to make the inside negative pressure. On the other hand, a specified amount of liquid thermosetting resin 61 is injected from the injection nozzle 62.

  The injected liquid thermosetting resin 61 flows into the tubular body 6 while being uniformly impregnated in the belt-shaped nonwoven fabric 2, so that an impregnation portion 55 impregnated with the thermosetting resin 61 is formed in the tubular body 6. . At this time, the liquid thermosetting resin 61 gradually moves from the impregnated portion 55 to the non-impregnated portion 57. At the boundary between the impregnation portion 55 and the non-impregnation portion 57, the non-impregnation portion 57 is closed by the action of negative pressure, but the closing action disappears at the impregnation portion 55, and the liquid thermosetting resin 61 is in the tubular body 6. Acts to expand the diameter. Thereby, the liquid thermosetting resin 61 acts to release the needle coupling portion 12. At this time, since the negative pressure is applied to the non-impregnated portion 57, the tubular body 6 is kept closed unless the impregnation with the thermosetting resin 61 proceeds. Thereby, the impregnation of the liquid thermosetting resin 61 and the release of the needle coupling portion 12 can be progressed uniformly. In order to favorably advance the impregnation of the thermosetting resin 61 and the release of the needle coupling portion 12 as described above, for example, the negative pressure of the non-impregnated portion 57 is 0.03 MPa or more, and the viscosity of the thermosetting resin 61 is Is selected to be about 7 dpa · s.

  As described above, according to the present invention, both end portions of the belt-shaped nonwoven fabric 2 are overlapped and the overlapping portion 5 is connected by the needle punch, so that the overlapping portion 5 does not open and the end portions are connected. It can be performed reliably and easily, and the strength can be maintained. In addition, since the overlapping portion 5 and the facing portion 7 at both ends of the belt-shaped nonwoven fabric 2 are needle punched, it is not necessary to simultaneously advance the overlapping of both ends and the needle connection of the overlapping portion 5. For this reason, mechanical equipment can be simplified. In this case, since the coupling between the overlapping portion 5 and the facing portion 7 can be easily released, the function of the pipe lining material is not impaired.

1 31 41 51 Tube lining material 2 Strip-like non-woven fabric 4 Tapered portion 5 Overlapping portion 6 Tubular body 7 Facing portion 8 Needle 12 Needle coupling portion 13 Tubular tube 14 Tubular film 21 Outer member 22 Inner member 32 Plastic film coating felt (plastic sheet)
42 52 Plastic tube (plastic sheet)
61 Thermosetting resin

Claims (10)

  A tubular lining material, wherein the overlapping portion of the tubular body formed by overlapping both end portions of a belt-shaped nonwoven fabric and the facing portion facing the overlapping portion are joined by needle punching. An inner member in which the overlapping portion of the tubular body formed by overlapping both end portions of the belt-shaped nonwoven fabric and the facing portion facing the overlapping portion are combined by needle punching;
An outer member in which both ends of the belt-shaped nonwoven fabric are overlapped in a state where the inner member is wrapped in a tubular shape with another belt-shaped nonwoven fabric, and the overlapped portion and the facing portion facing the overlapped portion are joined by needle punching. ,
A pipe lining material, wherein the needle coupling portion of the inner member and the needle coupling portion of the outer member are offset.   The pipe lining material according to claim 1 or 2, wherein a needle coupling portion coupled by the needle punching process is released by expanding the tubular body.   The pipe lining material according to any one of claims 1 to 3, wherein tapered portions that are obliquely cut are formed at both ends of the belt-shaped nonwoven fabric, and the tapered portions are overlapped portions. .   A method for producing a pipe lining material, comprising forming a tubular body by overlapping both end portions of a belt-shaped nonwoven fabric, and joining the overlapped portion of the tubular body and a facing portion facing the overlapped portion by needle punching .   The tubular lining material according to claim 5, wherein a tubular tube is inserted into the tubular body, and a fluid pressure is applied to the tubular tube to release the needle coupling portion coupled by the needle punching. Production method.   A liquid thermosetting resin is injected into the tubular body to impregnate the belt-shaped non-woven fabric with the thermosetting resin, and the diameter of the tubular body is expanded by the liquid thermosetting resin to form the needle coupling portion. The method for producing a pipe lining material according to claim 5, wherein the pipe lining material is released. A tubular body is formed by overlapping both end portions of the belt-shaped nonwoven fabric, and an inner member is formed by combining the overlapping portion of the tubular body and the facing portion facing the overlapping portion by needle punching,
Then, the both ends of the belt-like nonwoven fabric are overlapped in a state where the inner member is wrapped in a tubular shape with another belt-like nonwoven fabric, and the overlapping portion is offset from the overlapping portion of the inner member, and overlapping is performed at this offset position. A method for manufacturing a pipe lining material, wherein an outer member is formed by joining a portion and a facing portion facing the overlapping portion by needle punching.   The pipe lining according to any one of claims 5 to 7, wherein both ends of the belt-shaped nonwoven fabric are cut obliquely to form a tapered portion, and the tapered portion is overlapped to form an overlapped portion. A method of manufacturing the material.   The pipe lining material according to any one of claims 1 to 4, wherein the outer surface of the pipe lining material is covered with a plastic sheet in an airtight manner, the strip-shaped nonwoven fabric is impregnated with a liquid thermosetting resin, and then inserted into an existing pipeline. A pipe lining method characterized in that the thermosetting resin is hardened in close contact with an inner wall surface of an existing pipe line by fluid pressure.

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