JP4247391B2 - Manufacturing method of pipe lining material - Google Patents

Description

The present invention is an improved invention relating to a method for manufacturing a pipe lining material used for repairing pipelines such as sewers, gas pipes, communication cables, and water pipes.

Conventionally, Japanese Patent Application Laid-Open No. 4-59227 discloses a “method for manufacturing a pipe lining material”. Specifically, a tubular resin absorbent material is passed inside a highly confidential plastic tube, and a highly confidential pressure tube is inserted inside the resin absorbent material, and the pressure tube is expanded by fluid pressure. The pipe lining material is obtained by evacuating the plastic tube and the resin absorbent, heating the plastic tube, and then welding the plastic tube and the resin absorbent to the outer surface of the resin absorbent.

However, in the “method for manufacturing a pipe lining material”, a tubular resin absorbent material is inserted into a plastic tube, a pressurizing tube is inserted into the tubular resin absorbent material, and fluid pressure is applied to the pressurizing tube to form a tubular shape. In the conventional method in which the tubular resin absorbent material and the plastic tube are melted by heat with a vacuum pump while the resin absorbent material and the plastic tube are both expanded together, the tubular resin absorbent material, etc. When the length of the tube is long, there is a problem that it is difficult to insert and pull out the pressurizing tube to be inserted into the tubular resin absorbent material.

Specifically, as shown in the pipe lining material manufacturing method 1a of FIG. 8, the tubular resin absorbent material 2 having a length of 50 to 100 m and the plastic tube 4 covering the outer surface of the tubular resin absorbent material 2 are used. When a plurality of 4a are connected at the connection end 2a, a pipe lining material having a length of 500 m to 1000 m is obtained, and in addition, the connection end 2a which is a connection portion between the tubular resin absorbent material 2 and the plastic tubes 4 and 4a is hermetically sealed. For this reason, it was extremely difficult to insert and pull out the pressurizing tube 3. Hereinafter, the plastic tube 4 is before the completion of welding, and the plastic tube 4a is after the completion of welding.

Secondly, since the pressurizing tube 3 is used by repeatedly performing reversal and reverse reversal more than 100 times during the welding operation, a pinhole or the like is easily generated, and the plastic film 3c covering the surface of the pressurizing tube 3 is used. It was easy to cause damage such as pinholes.

Thirdly, since the plastic film 3c covering the surface of the pressurizing tube 3 before inversion did not have both heat resistance and bending resistance functions, it was caused by the heater 11 generated during the welding operation such as inversion and reverse inversion. It was easy to deteriorate due to heat and load such as heating and friction.

Fourth, when a pinhole is generated in the plastic film 3c, the vacuum force in the tubular resin absorbent material 2 is reduced and the sticking of the plastic tube 4 to the tubular resin absorbent material 2 is weakened. There has been a problem of poor coating resulting in poor welding with reduced weld strength.

Fifthly, when the plastic tube 4 is welded, the pressurizing tube 3 is disposed inside the tubular resin absorbent 2 and the plastic film 3c on the inner surface of the pressurizing tube 3 cannot be visually observed. It was difficult to find.
JP-A-4-59227

The problems to be solved by the present invention are the problem that it is difficult to insert and pull out the pressurizing tube, the second problem that the pinhole is damaged when the pressurizing tube is reversed and reversed, and the third problem. Of the plastic film 3c covering the surface of the pressurizing tube 3 before the reversal of the heat, the deterioration due to the heat and friction such as heating and friction generated by the heater 11 that occurred at the time of the reversal and reverse reversal, and pinholes in the fourth plastic film 3c. In the case where it occurs, the problem of lowering the vacuum force in the tubular resin absorbent material 2, the problem of poor coating of the plastic tube 4 accompanying the lowering of the vacuum force, and the fifth plastic film 3c are inside the tubular resin absorbent material 2. However, it was a problem that required difficulty in finding pinholes.

Therefore, the present invention selects a plastic film with good pinhole resistance even when repeated reversal and reverse reversal are performed in order to solve problems such as difficulty in inserting and pulling out the pressurizing tube, Use a plastic film with heat resistance, or use a tube lining material with a structure where high heat does not directly act on the plastic film, and "by applying fluid pressure to the pressurizing tube," pressurizing tube inside the tubular resin absorbent material "inversion insert and was designated as the manufacturing method of the pipe lining material, characterized in that it is possible to easily obtain a pipe-lining material.

In the present invention, a tubular resin absorbent material is inserted into a plastic tube, a pressurizing tube is inserted into the tubular resin absorbent material, and fluid pressure is applied to the pressurizing tube to absorb the tubular resin. Both the material and the plastic tube are spread together, the air inside the tubular resin absorbent material is extracted with a vacuum pump, heat is applied to the plastic tube with the plastic tube and the tubular resin absorbent material in close contact, and the outer surface of the tubular resin absorbent material In the method of manufacturing a tube lining material by welding a plastic tube to the tube, a fluid pressure is applied to the pressurizing tube, the pressurizing tube is inverted and inserted inside the tubular resin absorbent material, and reversely inverted. It was set as the manufacturing method of the pipe lining material to do.

The “ method for producing a pipe lining material” according to the present invention is a method of firstly applying a fluid pressure to a pressurizing tube in a state where the long tubular resin absorbent material or the other end is sealed by connection. It can be easily inserted in the reverse.

Secondly, since the outer surface of the pressurizing tube before inversion is a single film such as a plastic film having a high barrier property against the fluid pressure , the friction coefficient is extremely small and good sliding. Therefore, it is possible to easily eliminate snagging problems such as such as pressure tube in the tube.

After reversal of the pressure tube in the third, it is the inner surface of the outer surface, the non-inverting pressurizing tube is by proceeding as sliding smooth inner surface of the plastic film 3c, easily tubular long pressurization tube It can be inserted inside the resin absorbent.

Fourth, when the air inside the tubular resin absorbent material is extracted with a vacuum pump or the like, the vacuum force can be easily measured with a vacuum gauge. Specifically, when there is no air leakage outside the pressurizing tube (inside) and the plastic tube, the vacuum force in the tubular resin absorbent material reaches near the maximum capacity of a vacuum generator such as a vacuum pump. This is because when a pinhole occurs, the vacuum force does not reach the maximum capacity. In addition , by applying colored water to the surface of the plastic tube together with the vacuum gauge, air leakage outside the plastic tube can be easily detected visually.

In the present invention, a tubular resin absorbent material is inserted into a plastic tube, a pressurizing tube is inserted into the tubular resin absorbent material, and fluid pressure is applied to the pressurizing tube to absorb the tubular resin. Both the material and the plastic tube are spread together, the air inside the tubular resin absorbent material is extracted with a vacuum pump, heat is applied to the plastic tube with the plastic tube and the tubular resin absorbent material in close contact, and the outer surface of the tubular resin absorbent material In the method of manufacturing a tube lining material by welding a plastic tube to the tube, a fluid pressure is applied to the pressurizing tube, the pressurizing tube is inverted and inserted inside the tubular resin absorbent material, and reversely inverted. The manufacturing method of the pipe lining material to perform can be provided.

Details of the method for manufacturing a pipe lining material according to the present invention will be described below with reference to the accompanying drawings.

1 is a longitudinal sectional view showing an embodiment of a method of manufacturing a pipe liner bag which is the present invention, FIG. 2 is a longitudinal sectional view the insertion of the pig-like air ball plastic tube manufacturing method of the pipe lining material is the invention FIG. 3 is a longitudinal sectional view in which a tubular resin absorbent material is inserted into a plastic tube by the method for producing a tube lining material according to the present invention.

FIG. 4 is a vertical sectional view in which the pressurizing tube is inverted and inserted by fluid pressure so that the plastic film is inside the tubular resin absorbent material in the tubular lining material manufacturing method according to the present invention, and FIG. longitudinal cross-sectional view are inverted inserts pressure tube inside the tubular resin absorbent material in the production method of the pipe lining material is present invention, FIG. 6 is a tubular resin-absorbing material in the production method of the tubular lining material is the invention It is the longitudinal cross-sectional view which showed that the tube for pressurization was pulled out by reverse inversion inside.

Incidentally, FIG. 7 shows a conventional example of inverted insertion vertical sectional view before the pressurization tube, FIG. 8 the method of manufacturing the pipe liner bag is a present invention for use in a method of manufacturing the pipe liner bag is the invention FIG. Details will be described below with reference to the accompanying drawings.

As shown in FIG. 1, in the present invention, a tubular resin absorbent material 2 is inserted into the plastic tubes 4, 4 a, and a pressurizing tube 3 is inserted into the tubular resin absorbent material 2. 3, fluid pressure is applied to both the tubular resin absorbent material 2 and the plastic tubes 4, 4 a, and the air inside the tubular resin absorbent material 2 is extracted by the vacuum pump 5, and the plastic tubes 4, 4 a and the tubular resin are removed. In the method of manufacturing a pipe lining material by applying heat to the plastic tubes 4 and 4a with the heater 11 in a state where the absorbent material 2 is in close contact, and welding the plastic tubes 4 and 4a to the outer surface of the tubular resin absorbent material 2, A tubular resin absorbent material is obtained by applying fluid pressure to the pressurizing tube 3 having the pulling rope 7a on the pressurizing tube end 3a, which is one end, using a compressor 6 or the like. Inserts by inverting the pressurizing tube 3 therein, is to provide a manufacturing method 1 of the pipe lining material, characterized by repeatedly be implemented to reverse inversion when removing the pressurizing tube 3.

As shown in FIGS. 1 and 2, the plastic tube 4 must be processed in order to obtain the pipe lining material 1 of the present invention. Therefore, tubular plastic tubes 4 and 4a are made from a composite film containing nylon or polyethylene by an inflation method. Moreover, the plastic tubes 4 and 4a can be welded to the tubular resin absorbent material 2, and both ends of a flat plastic film may be heat-welded and processed into a tubular shape.

As shown in FIG. 2, the rope 7 a in the plastic tube 4 is routed from the end 4 c of the plastic tube 4. At this time, the end 4c of the plastic tube 4 has an inner diameter that is the same as or slightly larger than the outer diameter of the rope 7a.

The air ball with rope 7 is inserted into the plastic tube 4 , the end 4c of the plastic tube 4 is closed, and pressurized air is supplied from the compressor 6 through the air hose 6a between the closed portion and the air ball 7 space S. Then, the rope 7 a passes through the plastic tube 4 by moving the air ball 7 from one end of the plastic tube 4 to the other end.

As shown in FIG. 3, the tubular resin absorbent material 2 can be inserted into the plastic tube 4 by passing the rope 7 a through the plastic tube 4 and pulling it in the direction of the arrow in FIG. 3 . At this time, a plurality of vacuum holes 4 b are provided on the surface of the plastic tube 4. This is because an external air leak can be easily found with a vacuum gauge or the like when a pinhole is generated in the pressurizing tube, which is a problem to be solved.

The tubular resin absorbent material 2 is processed into a tubular shape with a plastic non-woven fabric such as polyester fiber, or a non-woven fabric in which plastic fiber such as plastic fiber and glass fiber are mixed. The outer diameter of the tubular resin absorbent 2 is set smaller than the inner diameter of the plastic tube 4.

The pressurizing tube 3 shown in FIGS. 1 and 4 includes a plastic film 3c and a tubular fibrous body 3d on the inner surface thereof. Plastic film 3c covers vinyl chloride film, polyurethane film, a hermetically tubular fibrous member 3d in one of the material polypropylene film. The plastic film 3c inner surface of the covering cormorants tubular fibrous member 3d of the tubular nonwoven fabric, made of any one material of a mixture of tubular woven fabric, or a tubular non-woven and woven fabrics.

The pressurizing tube end 3a, which is one end of the pressurizing tube 3, is provided with a pull-back rope 7a, and after inversion, the plastic film 3c is an inner surface and the tubular fibrous body 3d is an outer surface. is there. The plastic film 3c is coated on a nonwoven fabric, a woven fabric, or a fibrous body. In addition, the said coating can be performed arbitrarily.

For the plastic film 3c, by selecting an elastomer such as PVC (vinyl chloride film), soft polyurethane film, polypropylene (rubber blend), etc., pin resistance against repeated use during welding, which is one of the problems to be solved Functionality such as hole property, bending resistance, twisting resistance, and turning property can be improved.

Further, when the pressurizing tube 3 is inverted and inserted into the tubular resin absorbent material 2, the tubular fibrous body 3 d having a heat insulating effect is positioned between the plastic film 3 c and the tubular resin absorbent material 2. The acting heat can be suppressed.

As shown in FIGS. 1 and 5, the outer diameter of the pressurizing tube 3 is usually set larger than that of the tubular resin absorbent material 2. By supplying air, which is a kind of fluid pressure, into the pressure vessel 9 provided with an air vent valve 9a by a compressor 6 or the like, the pressurizing tube 3 is inverted and can be inverted and inserted into the tubular resin absorbent material 2. it can. The fluid pressure may be not only air but also fluid such as gas.

The reversal pressure at the time of reversal insertion of the pressurizing tube 3 is normally 0.01 mpa to 0.1 mpa. This is because the reverse pressure may increase due to a decrease in temperature. In order to use heated air, the air may be heated with a heater or the like. Further, in order to make the inversion insertion of the pressurizing tube 3 smoother, oil, wax or the like may be applied to the surface of the pressurizing tube 3.

Pressurizing the tube as shown in FIGS. 1 and 6 3, pull back pulling the tubular resin-absorbing material 2 inside from pressurizing tube 3 Ru with a traction tool, such as a rope 7a or belt. Therefore, after the plastic tube 4 is welded to the outer surface of the tubular resin absorbent material 2, the traction tool is taken up by the take- up reel 10 of the pressure vessel 9, so that the pressurizing tube 3 is reversely reversed and added to the pressure vessel 9. The pressure tube 3 can be accommodated. Next, details of the attachment position of the pressurizing tube 3 to the pressure vessel 9 will be described.

As shown in FIG. 1, one end of the pressurizing tube 3 adjacent to the pressure vessel 9 is folded back in a substantially trumpet shape and is airtightly attached to the tip of the reversing nozzle 9 b provided at the tip of the pressure vessel 9. Attached . The other end of the pressurizing tube end 3a is hermetically closed by a ring-shaped end belt 3b .

Said end belt 3b is connected to the rope 7a, it is connected to the take-up reel 10 in the pressure vessel 9 via the rope 7a. Instead of the rope 7a, a traction tool such as a belt made of a synthetic resin material, a fibrous material, or the like may be used. Next, the connection method for connecting a plurality of tubular resin absorbent materials 2 and plastic tubes 4 in FIG. 1 will be described in detail.

As shown in FIG. 1, an unwelded portion is left at the end of the plastic lining 4 on the tube lining material side where welding has been completed, and one end of the tubular resin absorbent material 2 where welding of the plastic tube 4a is completed, and the plastic tube is now One end of the tubular resin absorbent material 2 for welding 4 is connected by sewing or the like.

End of the plastic tube 4,4a is the side that connects, connected thereto enlargement longer than the end of the tubular resin-absorbing material 2 in both sides, superimposing the ends of the plastic tube 4,4a at the connecting end 2a . The overlapping plastic tubes 4 and 4a can be welded in an airtight manner before the welding operation.

After the connection between the tubular resin absorbent materials 2 is completed at the connection end 2a , the pressurizing tube 3 is inverted and inserted into the tubular resin absorbent material 2, and the reverse insertion is terminated when the connection end 2a is exceeded. .

After the reverse insertion of the pressurizing tube 3 is completed, the plastic tubes 4 and 4a covering the outer periphery of the tubular resin absorbent material 2 are hermetically welded while the pressurizing tube 3 is pressurized as it is. Can do.

The hermetic welding means that the end portion on the reversing nozzle 9b side is completely covered with the external sealing tube 8 and sealed. Further, the outer sealed tube 8 can be airtightly attached with a fastening belt 8a or the like so as to be in close contact with the reversing nozzle 9b. In order to further improve the airtightness between the reversing nozzle 9b, the pressurizing tube 3, and the external sealed tube 8, a coating material such as silicone or urethane may be applied between them .

And after the end of the adjacent pressure tube 3 and sealed hermetically in the pressure vessel 9, then set the vacuum pads 5a to the vacuum holes 4b provided on the surface of the plastic tube 4, the tubular resin in a plurality of vacuum pumps 5 The air inside the absorbent material 2 is extracted.

At this time, a vacuum gauge 5b with a vacuum pad 5a is provided in the other vacuum hole 4b, and the vacuum force inside the tubular resin absorbent material 2 is measured. That is, the presence or absence of pinholes in the pressurizing tube 3 can be confirmed by measuring the vacuum force of both of the plurality of vacuum holes 4b provided in the vacuum gauge 5b. Note that there is no problem if both the vacuum pump 5 and the vacuum gauge 5b are alternately used in the same vacuum hole 4b.

The heater 11 is heated in a state where the plastic tube 4 and the tubular resin absorbent material 2 are in close contact with each other, and the surfaces of the tubular resin absorbent material 2 and the plastic tube 4 are moved in a non-contact state. The moving speed of the heater 11 at this time is preferably increased in accordance with humidification.

When the welding of the plastic tube 4 is started, if the heater 11 is not completely heated, the heater 11 may be returned to the rear once and restarted. In addition, when the heater 11 passes through the vacuum hole 4b provided on the surface of the plastic tube 4, the vacuum hole 4b may be blocked with a vinyl tape or the like in advance.

Then, after the plastic tube 4 is welded to the outer surface of the tubular resin absorbent material 2, colored water can be applied to the surface to check the pinhole. However, it is limited only when a vacuum force is acting inside the tubular resin absorbent material 2. If there is no pinhole, colored water does not enter the tubular resin absorbent 2 through the plastic tube 4. The normal heater 11 moves from the reversing nozzle 9b side to the place beyond the connection end 2a.

At this time, the surface temperature of the plastic tube 4 may be measured to adjust the moving speed of the heater 11. Moreover, the moving speed of the heater 11 can be appropriately adjusted with a change in the outside air temperature. The moving speed of the heater is set to 1 to 15 m / min, and the surface temperature of the plastic tube 4 is set to 100 to 200 ° C.

From the above results, the “ method for producing a pipe lining material” according to the present invention can solve such a problem, and can obtain a pipe lining material having a length of 500 m to 1000 m in a very short time.

FIG. 7 is a longitudinal sectional view of the pressurizing tube 3 used in the present invention. As shown in FIG. 7, the pressurizing tube 3 has a thickness on the outer surface of a woven fabric or a non-woven fabric or a fiber-like body made of polyester such as woven fabric and non-woven fabric, nylon, acrylic, vinylon, rayon, etc. This is a tube material in which a plastic film 3c made of any one of soft vinyl chloride, polyurethane and polypropylene is coated by welding or adhesion within a range of 0.01 mm to 1.2 mm.

The pressurizing tube 3 is adjusted by cutting or joining the belt-like body to a set size, and the sewing portions 3f which are both ends are joined by any one method of sewing, welding or bonding. A tubular body is used.

As shown in FIG. 7, the butted portion of the plastic film 3c on the surface of the pressurizing tube 3 is hermetically sealed by welding or bonding by processing the same type of plastic film 3c into a ribbon tape 3e shape and can be closed. . As another method, the outer surface of the tubular fibrous body 3d may be simply covered with the tubular plastic film 3c and not coated. In other words, it does not require a Canara Zushimo coating.

When welding of the plastic film 3c to the tubular resin absorbent material 2 is completed, the vacuum force applied to the tubular resin absorbent material 2 is released. At this time, pressurized air may be injected from the vacuum hole 4b. Then, the pressurizing tube 3 is reversely inverted while an air pressure of 0.003 to 0.05 mpa is applied to the pressurizing tube 3. Along with the reverse inversion, the pressurized air in the pressurizing tube 3 is exhausted to the outside through the air vent valve 9a.

It is the longitudinal cross-sectional view which showed the Example of the manufacturing method of the pipe lining material which is this invention. It is the longitudinal cross-sectional view which inserted the pig-like air ball in the plastic tube with the manufacturing method of the pipe lining material which is this invention. It is the longitudinal cross-sectional view which inserted the tubular resin absorber in the plastic tube with the manufacturing method of the pipe lining material which is this invention. It is the longitudinal cross-sectional view which reversely inserted the pressurization tube by the fluid pressure so that the plastic film may exist in the inside of a tubular resin absorbent material by the manufacturing method of the pipe lining material which is this invention. It is the longitudinal cross-sectional view which reversely inserted the tube for pressurization inside the tubular resin absorbent material with the manufacturing method of the pipe lining material which is this invention. It is the longitudinal cross-sectional view which showed that the tube for pressurization was pulled out by reverse inversion inside the tubular resin absorbent material by the manufacturing method of the pipe lining material which is this invention. It is a longitudinal cross-sectional view of the tube for pressurization before inversion insertion used with the manufacturing method of the pipe lining material which is this invention. It is the longitudinal cross-sectional view which showed the conventional Example of the manufacturing method of the pipe lining material which is this invention.

Explanation of symbols

Production method 1b welding already pipe liner 2 tubular resin absorbent material 2a connection end 3 pressurization tube 3a pressurizing tube end 3b end belt 3c plastic film 3d tubular fibrous member 3e ribbon manufacturing method 1a pipe lining material 1 pipe liner bag Tape 3f Sewing part
3g Inside the pressurizing tube 4 Plastic tube 4a Plastic tube 4b Vacuum hole 4c End 5 Vacuum pump 5a Vacuum pad 5b Vacuum gauge 6 Compressor 6a Air hose 6b Pressure gauge 7 Air ball 7a Rope 8 External sealing tube 8a Fastening belt 9 Pressure vessel 9a Air vent valve 9b Reversing nozzle 10 Take-up reel 11 Heater 12 End sealed cup

Claims (5)

The tubular resin absorbent material (2) and the tubular resin absorbent material (2) are connected to the connection end (2a) of the tube lining material (1b) in which the plastic tube (4a) is welded to the outer surface of the tubular resin absorbent material (2). And a non-welded plastic tube (4) in a hermetically connected manner (1) , wherein the tubular resin absorbent material (2) is inserted into the plastic tube (4) . From the above , the pressurizing tube (3) in which the outer surface of the tubular fibrous body (3d) is covered with a plastic film (3c) is passed over the connecting end (2a) by the action of fluid pressure in the tubular resin absorbent material (2). until reversed insertion, by the action of fluid pressure said to pressurizing the tube (3), the interior of said tubular resin absorbing material (2) and spread the plastic tube (4) together, the tubular resin-absorbing material (2) The vacuum of the air Taking vent in flops (5), said plastic tube (4) and said tubular resin absorbent material to heat to the plastic tube (4) in a state of being in close contact with (2) was added, the tubular resin-absorbing material (2) after welding the plastic tube (4) on the outer surface, while eliminating the fluid pressure in the pressurization tube (3) in reverse the pressurization tube (3) from the inside of the tubular resin absorbing material (2) A method for producing a pipe lining material, characterized by repeating the operation of making the pipe lining material (1b) in which the plastic tube (4a) is welded to the outer surface of the tubular resin absorbent material (2) by pulling it upside down ( 1) 2. The method for producing a pipe lining material according to claim 1 , wherein a vacuum gauge is provided to check the presence or absence of a pinhole in the pressurizing tube. 3. The method for manufacturing a pipe lining material according to claim 1, further comprising: a pulling rope for pulling out the pressurizing tube or a belt puller in the pressurizing tube. The plastic film, vinyl chloride film, polyurethane film, method of manufacturing a pipe lining material according to any one of claims 1 to 3, characterized in that either one of the material polypropylene film. Said tubular fibrous body, one of claims 1 to 4 tubular nonwoven, tubular fabric, or tubular nonwoven and that either one of the material of the mixture of the fabric, wherein 1 method for manufacturing a pipe lining material according to claim.

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