JP3877595B2 - Manufacturing method of pipe lining material - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a pipe lining material used for lining and repairing an inner peripheral surface of an aged pipe line.
[0002]
[Prior art]
When sewer pipes and other pipes buried in the ground are aged, a method of repairing by forming a hard coating on the inner peripheral surface without digging up those pipes is already known and put into practical use .
[0003]
This type of pipe lining method uses a pipe lining material in which a thermosetting resin is impregnated into a tubular resin absorbent whose outer peripheral surface is coated with a highly airtight thin film, and this pipe lining material is made of water or air. After being inserted into the pipe line with fluid pressure while being inverted, the thermosetting resin impregnated in the resin absorbent by replacing the fluid with warm water while pressing it against the inner peripheral surface of the pipe line with fluid pressure The resin is hardened, thereby forming a hard coating with a pipe lining material on the inner peripheral surface of the pipe.
[0004]
Here, as a lining material used for the pipe lining method as described above, for example, Japanese Patent Publication No. 58-33098 is known. Referring to FIG. 12, F is a fibrous felt layer (resin absorbent) made of polyester or the like, P is a film (thin film) made of plastic such as polyvinyl chloride, and the felt layer F and the film P The edges of the laminate made up of and are butted together and stitched by a sewing device. A ribbon r made of a plastic material is welded to the seam S while being heated by a heating device, and the needle hole in the sewing process is sealed by the ribbon r.
[0005]
Thus, the obtained pipe lining material is pre-impregnated with the curable resin in the felt layer F, or is reversely inserted into the pipe line while impregnating the curable resin, and the fluid is injected into the pipe. The curable resin is cured while being expanded under pressure.
[0006]
However, with this type of pipe lining material, it is difficult to obtain a sealing property by the ribbon r, and when this is expanded by fluid pressure, fluid leaks from the seam S or curable resin flows out into the pipe. There was something to do.
[0007]
On the other hand, as disclosed in JP-A-5-193001, a plastic absorbent is passed through a plastic tube, the resin absorbent is evacuated, and the plastic tube is brought into close contact with the outer peripheral surface of the resin absorbent. There is also known a method in which the resin is heated and welded to the outer peripheral surface of the resin absorbent material. In such a method, the resin absorbent material F and the plastic tube Pt are crushed into a flat plate shape as shown in FIG. Since both ends of the tube Pt protrude on both sides of the resin absorbent material F as long piece-like ears e, there is a problem that it cannot be welded evenly to the outer peripheral surface of the resin absorbent material. In addition, since the pipe lining is lined on the inner wall of the pipe line with the thin film made of plastic tube on the inner peripheral side, if the coating with the plastic tube is improper, not only the appearance of the lined pipe will be deteriorated, but also in the pipe line This will impair the flowability of water.
[0008]
Therefore, in Japanese Patent Publication No. 7-45182, as shown in FIG. 14A, a tubular resin absorbent material F is passed inside the plastic tube Pt, and a pressurizing tube T is inserted inside the resin absorbent material F. Next, as shown in FIG. 4B, the pressurizing tube T is expanded by fluid pressure to expand the plastic tube Pt and the resin absorbent material F into a circular tube, and the resin absorbent material F is evacuated by a vacuum pump V. Then, the plastic tube Pt is brought into close contact therewith, and then the plastic tube Pt is heated by the heating device H so as to be welded to the outer surface of the resin absorbent material F.
[0009]
[Problems to be solved by the invention]
However, in the method of expanding the resin absorbent material in an annular shape with the pressurizing tube as described above, in order to heat the plastic tube, a large number of cylindrical heaters corresponding to the resin absorbent material having various diameters must be prepared. However, there is a problem that enormous funds are required for the purchase and storage.
[0010]
In addition, since the pressurizing tube expanded by the fluid pressure is likely to fluctuate and it is difficult to keep it straight at a fixed position, the molten material adheres to the heater when the plastic tube is heated, and from the surface of the resin absorbent material. There is a risk of scraping.
[0011]
The present invention has been made in view of the above circumstances, and an object thereof is to efficiently produce a high-quality pipe lining material.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, the present invention passes a tubular resin absorbent material inside a plastic tube, while inserting a core member for expanding the resin absorbent material into a flat tubular shape inside the resin absorbent material, The resin absorbent is evacuated into a flat tubular shape by a core member, and the resin absorbent is evacuated to bring the plastic tube into close contact with the outer peripheral surface. The present invention provides a method for producing a pipe lining material, wherein a tube is welded to the outer peripheral surface of the resin absorbent material.
[0013]
Further, in the method of manufacturing a pipe lining material as described above, a panel heater that can be arranged in the same plane is used for heating the plastic tube, and the panel heater is formed on both sides in the short axis direction of the resin absorbent material formed into a flat tube. It is characterized by being installed facing each other.
[0014]
Further, as the core member, a pair of left and right rigid long materials that are arranged in parallel and an intermediate material for keeping the interval between the rigid long materials constant, preferably the intermediate material is a rigid long material. It is a pressurizing tube inserted between them, and is characterized by keeping the rigid long material at a constant interval in the resin absorbent material by expanding the pressurizing tube with fluid pressure.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, application examples of the present invention will be described in detail with reference to the drawings. First, FIG. 1 is a perspective view showing a pipe lining material according to the present invention partially cut away. This pipe lining material L is used for lining the inside of a pipe such as a sewer, and one end thereof is opened, and the other end does not leak a fluid for reversing and inserting the pipe into the pipe. It is sealed as such. Here, 1 is a fibrous resin absorbent material impregnated with a liquid curable resin, and this resin absorbent material 1 is made of polyester, polyethylene, polypropylene, polyurethane, acrylic, nylon (aliphatic polyamide fiber), aramid ( Totally aromatic polyamide fiber), vinylon, rayon, cupra (copper ammonia rayon), glass, carbon, ceramic, or non-woven fabric made by adhering fibers (short fibers or long fibers) such as cotton in sheet form The woven fabric is made into a tubular shape by stitching the edges of both ends, or by extruding the above fibers while heating using an extruder such as an extruder, etc. It is formed.
[0016]
On the other hand, 2 is a highly airtight thin film applied to the outer peripheral surface of the resin absorbent material, and this thin film 2 is formed by welding a plastic tube as will be described later to the outer peripheral surface of the resin absorbent material 1. The layer thickness of the thin film 2 is set to 50 to 500 μm, preferably 100 to 300 μm.
[0017]
Here, the manufacturing method of the above pipe lining materials is demonstrated. FIG. 2 is a schematic view showing a preferred example thereof. In FIG. 2, 3 is a plastic tube, and this plastic tube 3 is made of a thermoplastic resin made of polyethylene, polyvinyl chloride, polyurethane, nylon, polypropylene, or a copolymer thereof, and this is tubular by an inflation method or the like. The length is longer than that of the resin absorbent material 1 and the diameter is set to be equal to or larger than the outer diameter of the resin absorbent material 1. The plastic tube 3 may have a single-layer structure, but preferably has a two-layer or three-layer structure. For example, a two-layer structure in which the inner layer is made of heat-melting polyethylene and the outer layer is made of heat-resistant nylon, and a three-layer structure is made of the inner and outer layers made of heat-melting polyethylene and the intermediate layer is made of heat-resistant nylon. Things are used.
[0018]
According to the present invention, as the first step, the core member 4 that passes the resin absorbent material 1 inside the plastic tube 3 of that kind and pushes the resin absorbent material into the flat tubular tube inside the resin absorbent material 1. Then, the resin absorbent material 1 is evacuated while the resin absorbent material 1 is pushed and expanded by the core member 4 so that the plastic tube 3 is brought into close contact with the outer peripheral surface of the resin absorbent material 1. Incidentally, the flatness of the resin absorbent material 1 by the core member 4 (the long axis is a and the short axis is b, {(ab) / a}; see FIG. 4) is 0.3 to 0.95, preferably Is set to 0.5 to 0.95.
[0019]
Here, in this example, as the core member 4, a pair of left and right rigid elongated members 5A and 5B that are slidably coupled in the opposite direction in parallel, and rubber or plastic made between them are inserted. The pressure tube 6 is used. The rigid long materials 5A and 5B are plate-shaped fixed objects made of hard plastic, metal, wood, or the like that are as long as or longer than the resin absorbent material 1, and their outer edges 7 are semicircular. A flange 8 that is rounded in an arc shape and extends along the longitudinal direction is formed on the inner edge of one side 5 </ b> A, and the other rigid elongated member 5 </ b> B has a U-shaped cross section that fits into the flange 8.
[0020]
On the other hand, the pressurizing tube 6 is a flexible, highly airtight tubular material having a smaller diameter than the resin absorbent material 1, and this is inserted into a hollow portion 9 formed between the rigid long materials 5A and 5B. As shown in FIG. 3, the compressed air is expanded from the compressor 10 through the air hose 11 while the both ends are sealed.
[0021]
And according to this example, a pair of rigid elongate materials 5A and 5B are widened in the resin absorbent material 1, and the pressurizing tube 6 is passed through the hollow portion 9 opened between them, and the fluid pressure (this In the example, it is inflated by air pressure), and the pair of rigid long members 5A and 5B are spaced apart by a certain distance by the pressure, and the resin absorbent material 1 covered with the plastic tube 3 is expanded into a flat tube, and is in that state. The resin absorber 1 is evacuated by sucking out the air in the plastic tube 3 with a vacuum pump 12 as shown in FIG. Thereby, the plastic tube 3 adhere | attaches favorably along the outer peripheral surface of the resin absorbent material 1 made into the flat tubular shape like FIG.
[0022]
Therefore, as a second step, the plastic tube 3 is heated and welded to the resin absorbent material 1 while the plastic tube 3 is in close contact with the outer peripheral surface of the resin absorbent material 1. In this example, a panel heater 13 that can be connected in the same plane as shown in FIG. 5 is used for heating the plastic tube 3, and each panel heater 13 is opposed to both sides of the resin absorbent material 1 having a flat tube shape. Installed. According to this, the heating region can be easily increased / decreased only by changing the number of the panel heaters 13 used in accordance with the width of the resin absorbent 1 that is pushed into a flat tube. The panel heater 13 can be a planar blower connected to an air heater to emit hot air, etc., but in this example, an electric heater having a planar heating element laid with heating wires is used. Each is connected to a commercial power supply 15 or the like via a common temperature controller 14. Incidentally, each panel heater 13 is a square having a side of about 10 to 50 cm, and they are arranged in parallel in the width direction according to the diameter of the resin absorbent material 1 having a flat tube shape. Here, the heating temperature of the panel heater 13 is changed depending on the material of the plastic tube 3, but is generally set to 100 to 200 ° C.
[0023]
When the plastic tube 3 is heated by the panel heater 13, the resin absorbent material 1 covered with the plastic tube 3 is held horizontally or vertically, and the panel heater 13 is moved along the longitudinal direction thereof, or the panel heater 13 is fixed at a fixed position, and the resin absorbent material 1 and the plastic tube 3 that is in close contact with the outer peripheral surface thereof are moved in the horizontal direction or the vertical direction. In this example, the panel heater 13 is moved vertically up and down as shown in FIG. A method is adopted in which the resin absorbent material 1 and the plastic tube 3 that are formed in a flat tube shape are moved horizontally in the horizontal direction. In particular, the resin absorbent material 1 is placed on a table 16 made of a roller conveyor or the like, and passed through panel heaters 13 and 13 installed therebetween. Here, the resin absorbent material 1 and the plastic tube 3 are moved on the table 16 with the core member 4 built in. The feed speed is 10 to 100 cm / min, and the passing time in the panel heater 13 is 1 to 30. Set to about minutes.
[0024]
Thus, the plastic tube 3 is melted by radiant heat from the panel heater 13 while being in close contact with the outer peripheral surface of the resin absorbent material 1 formed into a flat tubular shape, and this is spread from one end side to the other end side of the resin absorbent material 1. It will be welded sequentially to the outer peripheral surface. As a result, a highly airtight thin film 2 formed by curing the melt of the plastic tube 3 is formed on the outer peripheral surface of the resin absorbent material 1.
[0025]
In addition, one end of the pipe lining material obtained as described above is sealed by heat-sealing the plastic tube 3 remaining in a protruding state in the longitudinal direction of the resin absorbent material 1 or by adding another plastic tube. The resin absorbent 1 is then impregnated with a liquid thermosetting resin such as an unsaturated polyester resin, an epoxy resin, or a urethane resin by a conventional method. Here, impregnation of the thermosetting resin into the resin absorbent material 1 is performed before use of the pipe lining material (before insertion into the pipe line), and during or after insertion into the pipe line. There is.
[0026]
A preferred example of the present invention has been described above, but the method according to the present invention is not limited to the above example, and the core member 5 that spreads the resin absorbent material 1 into a flat tubular shape is shown in FIG. A pair of rigid long materials 5A and 5B may be made independent, and while inserting them individually inside the resin absorbent material 1, a pressure tube 6 may be inserted between them to inflate them. According to this, the resin absorbent material 1 can be pushed out into a flat tube and the central portion can be pushed outward by the pressurized tube 6.
[0027]
The rigid long members 5A and 5B are not limited to plate-like ones whose outer edges are rounded into a semicircular shape, and a round shaft as shown in FIG.
[0028]
Further, as an intermediate material that keeps the distance between the rigid long members 5A and 5B constant, the pressurizing tube 6 that is expanded by the fluid pressure as in the above example is used, and the rigid long members 5A and 5B are used as shown in FIG. Taper-like piles 6A that are press-fitted between them at both longitudinal ends thereof, or small pieces 6B that are inserted between the longitudinal ends of rigid long members 5A and 5B as shown in FIG. As shown in FIG. 11, bolts 6C that are screwed at right angles to the inner edge of one rigid long material 5A at both longitudinal ends of the rigid long materials 5A and 5B can be used.
[0029]
Even in the core member having the intermediate material as described above, after passing the pair of rigid long materials 5A and 5B through the inside of the resin absorbent material 1, between the longitudinal ends of the rigid long materials 5A and 5B. The pile 6A and the piece 6B are pushed in, or the bolt 6C is protruded toward the other rigid long material 5B to widen the pair of rigid long materials 5A and 5B and push the resin absorbent material 1 into a flat tube. In this state, the plastic tube 3 can be satisfactorily welded to the outer peripheral surface of the resin absorbent material 1.
[0030]
【The invention's effect】
As is apparent from the above description, according to the present invention, the resin absorbent material passed through the inside of the plastic tube is expanded into a flat tube by the core member, and the resin absorbent material is evacuated in that state. Therefore, unlike the conventional case, the plastic tube does not become a long piece of ear and does not protrude from both side edges of the resin absorbent material, and the plastic tube adheres well along the outer peripheral surface of the resin absorbent material. By heating this as it is, a highly airtight thin film having a uniform thickness can be formed on the outer peripheral surface of the resin absorbent.
[0031]
In addition, since the resin absorbent is pushed out into a flat tube, many cylinders corresponding to resin absorbents with different calibers are used compared to the conventional one in which the resin absorbent is pushed out in an annular shape with a tube having the same diameter. There is no need to prepare a type heater, and the outer periphery of a plastic tube into which resin absorbents having different diameters are inserted can be easily and uniformly heated using an existing electric heater or the like.
[0032]
Furthermore, since the wobbling of the resin absorbent material can be suppressed by the core member, the plastic tube is not scraped off by contact with the heater for heating, and can be favorably welded with a uniform thickness.
[Brief description of the drawings]
FIG. 1 is a perspective view of a pipe lining material according to the present invention partially cut away. FIG. 2 is a perspective view showing a state in which a core member is inserted inside a resin absorbent material as an application example of the present invention. 3] A perspective view showing a state where a pressure tube constituting a core member is expanded. [FIG. 4] A perspective view showing a state where a resin absorbent material is evacuated. [FIG. 5] A front view showing a state where a plastic tube is heated. Schematic diagram [FIG. 6] Schematic side view showing the state of heating the plastic tube [FIG. 7] Schematic diagram of the front showing a modification of the core member [FIG. 8] Schematic diagram of the front showing a modification of the core member [FIG. 9] A perspective view showing a modified example of the core member. [Fig. 10] A perspective view showing a modified example of the core member. [Fig. 11] A perspective view showing a modified example of the core member. [Fig. FIG. 13 is a perspective view showing a manufacturing example. FIG. 14 is an explanatory view showing another example of manufacturing a pipe lining material in the prior art.
L pipe lining material
1 Resin absorbent
2 Thin film
3 Plastic tube
4 core members
5A, 5B Rigid long material
6 Pressurizing tube 10 Compressor 11 Air hose 12 Vacuum pump 13 Panel heater

Claims (4)

  While passing the tubular resin absorbent material inside the plastic tube, a core member for pushing the resin absorbent material into the flat tube is inserted inside the resin absorbent material, and the resin member is flattened by the core member. The resin absorbent material is evacuated while being spread out to make the plastic tube adhere to the outer peripheral surface thereof, and the plastic tube is heated while maintaining the state to keep the plastic tube on the outer peripheral surface of the resin absorbent material. A method for producing a pipe lining material, characterized by welding. 2. A panel heater that can be arranged in the same plane is used for heating the plastic tube, and the panel heater is disposed opposite to both sides in the short axis direction of the resin absorbent material formed into a flat tube. Manufacturing method for pipe lining materials.   2. A pipe lining material according to claim 1, wherein a pair of left and right rigid long materials in parallel and an intermediate material for maintaining a constant interval between the rigid long materials are used as the core member. Method.   The intermediate material is a pressurized tube inserted between rigid long materials, and the pressurized long tube is expanded at a constant interval by expanding the pressurized tube with fluid pressure. The method for producing a pipe lining material according to claim 3.

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