JPH062254B2 - Guide device for pipe inner surface lining device - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

The present invention relates to a pipe inner surface lining device for an existing pipe for repairing such as forming a resin lining coating film on the inner surface of the existing pipe such as a gas pipe laid underground, in an embedded state, More specifically, the present invention relates to a guide device for a pipe inner surface lining device that smoothes the movement of the lining device in the bent portion of an existing bent pipe and reliably lining the pipe inner surface.

2. Description of the Related Art Generally, existing pipes such as gas pipes laid underground have corrosion holes in the pipes due to the passage of time after laying, which may cause a leakage phenomenon. For the purpose of repair or preventive maintenance, repairs are performed to form a resin lining coating film on the inner surface of the pipe. As one kind of the pipe inner surface lining repair method, a repair resin and a pig device having a pig that pushes the resin from the rear are inserted into the pipe of an existing pipe, and the pig device is pulled by a tow line. When moving the resin along the inner surface of the pipe,
A method is known in which a gap between the outer circumference of the pig and the inner surface of the pipe is used as a lining gap, and the resin flows out from the gap toward the rear of the pig to form a resin lining coating film having a predetermined thickness on the inner surface of the pipe. Examples of such prior art are Japanese Patent Laid-Open Nos. 49-13236 and 52-7.
No. 8250, Japanese Patent Laid-Open No. 53-26840, and the like. In these prior arts, a pig for pushing a resin is moved by air pressure and is pulled by a tow line connected to the pig. There is a method.

[Problems to be Solved by the Invention]

By the way, as described above, in the repair method of pushing the resin in the pipe to be repaired by the pig to form the lining coating film on the inner surface of the pipe, in the method of propelling the pig by the air pressure, leakage due to the applied air pressure There is a risk that the blocking effect of the part will become insufficient and the phenomenon that the leaked part will expand will occur, and it was unsuitable for repairing gas pipes and the like. Further, in the method of pulling the pig with a tow rope or the like, if the pipe to be repaired is a straight pipe, the pig can move smoothly, but if it is a bent pipe, the pig is easily caught at the bent portion, Moreover, since the tow line contacts the inner wall of the bend in the pipe and moves while being bent, there is a drawback in that the tow resistance increases and smooth movement of the pig is difficult. That is, as shown in FIG. 4, the tow cable 4 connected to the lining pig 21 having an outer diameter slightly smaller than the inner diameter of the pipe to be repaired is pulled, and the resin C on the front side of the lining pig 21 is attached to the peripheral surface of the lining pig 21. When the pipe to be repaired has a bent portion 1a when further flowing out and forming a uniform lining coating film on the inner surface of the pipe, the tow line 4 contacts the inner wall of the bent portion 1a and moves while being bent. . And resin pig 21
The lining pig as it approaches the bent part 1a of the bent pipe.
The force for moving 21 in the traveling direction becomes gradually smaller, and the force for pressing the lining pig 21 against the inner wall of the pipe becomes gradually larger, so that the required traction force is greatly increased. Moreover, the tow line 4 is provided with a lining pig when passing through the bent portion 1a.
21 has a drawback in that it cannot effectively give the turning force required to change its traveling direction, and the lining pig 21 is easily caught. Therefore, in order to eliminate the above-mentioned drawbacks, as shown in FIG. 5, one end of a plurality of flexible linear members 30 is attached to the outer periphery of the lining pig 21, and the other ends are converged to draw a tow line. It is known that a flexible tow cord 31 in the form of an envelope cone, which is fixed to the cable 4, is provided. However, when forming a lining coating film on the inner surface of the pipe using the lining pig 21 provided with the flexible tow rope 31 described above, when the lining pig 21 approaches the bent portion 1a of the bent pipe,
Although the flexible traction line 31 can prevent the increase in the required traction force at a portion in contact with the inner wall of the pipe, the flexible traction line 31 on the side in contact with the inner wall of the pipe is slackened to bend the bent portion 1a. There is a problem that it is difficult to effectively prevent the lining pig 21 from being caught by the lining pig 21 and smoothly apply the lining. The present invention has been made for the purpose of solving the above-mentioned problems.

[Means for Solving the Problems]

In order to achieve this object, the apparatus according to the present invention inserts a repair resin C and a pig apparatus 2 having a pig 21 that pushes the resin C from the rear into the pipe of the existing pipe 1. In the lining device that draws the device 2 by the tow line 4 to allow the resin C to flow to the rear of the pig to form a lining coating film on the inner surface of the pipe, the front outer diameter of the tow line 4 on the front side of the lining device is small. A plurality of disc-shaped washers 41 to 44 whose diameter gradually increases toward the rear and whose final outer diameter is slightly smaller than the outer diameter of the pig 21 are arranged at predetermined intervals via the bosses 41a to 44a of the washer. The guide device 40 is installed, and the insertion holes 41b to 44b of the tow lines formed in the boss portions 41a to 44a of the washer in the guide device 40 become smaller as the outer diameter of the washers 41 to 44 becomes smaller. And pull the above-mentioned tow rope 4 When the lining device moves in the bent part 1a of the pipe, the disk-shaped washers 41 to 44 are bent.
In 1a, the inner end side is approached and the outer end side is separated so as to be inclined and overlapped with each other, and the pulling rope 4 is supported so as to be closer to the center line direction of the inner surface of the pipe.

[Action]

With the above configuration, a lining coating film is formed on the inner surface of the pipe to be repaired with a pig to a substantially uniform thickness over the entire length of the pipe to be repaired, and even if a bent pipe is used in the repair section, the bending of the bent pipe The tow line in the section is smoothly moved through the guide device without directly touching the inner wall of the pipe, the movement of the lining device is made smooth, and the tow force applied to the tow line is reduced.

【Example】

Hereinafter, embodiments of the present invention will be specifically described with reference to the accompanying drawings. 1 is a sectional view showing a pipe inner surface lining device according to the present invention, FIG. 2 is an operation explanatory view showing a case where a guide device of the pipe inner surface lining device according to the present invention moves a curved pipe portion, and FIG. 3 is a view showing the present invention. 2 is a schematic diagram showing the overall configuration of a repair construction device according to FIG. 1, in which reference numeral 1 is an existing pipe to be repaired. If this existing pipe 1 is a gas pipe, it is commonly called a "branch pipe".
It is a conduit that is laid under the road, etc., and there is a risk that leakage holes will occur due to corrosion holes etc. occurring in the pipe over the years after laying,
For the purpose of leakage repair or preventive maintenance, repair is performed by forming a resin lining coating film on the inner surface of the pipe. At the time of this repair work, the existing pipe 1 is divided into repair sections L each having a length (for example, 100 m) suitable for repair, and the separation opening ends 11 and 12 of the existing piping 1 are pits A and B opened on the ground.
Expose inside. Then, the insertion guide tube 5 is connected to one separation end 11, and the extraction guide tube 6 is connected to the other separation end 12. The insertion guide tube 5 is provided with a resin inlet port 5a having an opening / closing cock 52 and an air vent port 5b also having the opening / closing cock 53, and the resin inlet port 5a includes a hose 7a. So that the repair lining resin C described later from the resin supply tank 7 can be injected into the pipe by the filling pressure of the compressed air from the small compressor 7c driven by the generator 7b. is there. Further, the other outlet guide tube 6 is provided with a resin discharge port portion 6a for discharging residual resin and a negative pressure introduction port portion 6b,
The negative pressure introducing port 6b is communicated with the vacuum pump 10 via the pressure adjusting unit 10a, and the negative pressure by the vacuum pump 10 can be introduced into the existing pipe 1 through the negative pressure introducing port 6b. There is. A tow cable 4 is passed through the existing pipe 1 through the opening at the tip of the insertion guide tube 5, and the tip of the tow cable 4 is drawn out from the other guide tube 6 and wound by a winch 9. Lining pig device 2 attached to tow line 4
Are introduced into the tube through the tip opening of the insertion guide tube 5. At the time of this introduction, the resin injection port 5a is provided on the front side of the pig apparatus 2.
The lining resin C for repairing is injected from. The lining resin C used here is, for example, a room temperature curing type two-liquid type resin liquid, and an amount sufficient to form a resin lining coating film of a predetermined length on the inner surface of the repair section L over the entire length of the tube. The resin is injected at once, and after this injection, the pig apparatus 2 is pulled by winding the tow line 4, so that the pig apparatus 2 moves the lining resin C injected on the front side thereof along the inside of the pipe. It is possible to push from the entrance side to the exit side. As shown in the enlarged view of FIGS. 1 and 2, the pig apparatus 2 is composed of a plurality of rubber discs at the front side of the shell-shaped lining pig 21 with a predetermined facing interval. The preceding pigs 22 to 25 are connected to each other, and each of the preceding pigs 22 to 25 has a plurality of resin circulation ports 26 formed in the circumferential portion of each pig 22 to 25. 25 resin outlets 26
Lining resin C pushed by the pig device 2 via the
Are sequentially moved between the rear pigs 22 and 23, 23 and 24, 24 and 25, and are brought to the front side of the lining pig 21. The leading pigs 22 to 25 have outer diameters such that the outer circumferences of the leading pigs 22 to 25 slide in airtight contact with the inner surface of the existing pipe 1, but the outer diameter of the rear lining pig 21 is larger than that of the existing pipe 1. The inner diameter of the tube is slightly smaller than the inner diameter of the tube, and the inner surface of the tube has a predetermined lining gap. In such a structure, when the pig apparatus 2 is pulled by winding the tow line 4 and the lining resin C is pushed along the pipe, the resin C is circled from the preceding pig 22 to the circles of each pig 22-25. After sequentially moving between the pigs in the subsequent stage through the resin circulation port 26 opened in the peripheral portion, the resin C is brought to the front side of the rear lining pig 21 so that the resin C flows out rearward from the peripheral surface of the pig 21. A lining coating film of resin C is formed on the inner surface of the existing pipe 1. Here, by properly selecting the number of preceding pigs 22 to 25 and the hole diameter and number of holes of the resin flow port 26, even when the resin amount is large and the resin pressure is large as in the previous stage of the repair section, Even in the middle and rear stages of the repair section where the amount of resin decreases and the resin pressure drops due to the progress of, the resin C leaks between the pigs in the latter stage through the resin flow port 26 in the narrow portion, and this is repeated multiple times. The pressure difference (resin pressure) is gradually attenuated, and the resin pressure on the front side of the lining pig 21 becomes substantially constant regardless of the amount of resin. In the previous stage of the repair section where the amount of resin is large, the above-mentioned pressure adjusting unit 10a largely controls the negative pressure applied to the inside of the pipe in the advancing direction of the lining resin C by the vacuum pump 10, while the repair progresses. When the amount of resin decreases, the negative pressure may be controlled to decrease accordingly. When such control is also used, when the resin amount is large in the preceding stage of the repair section (when the resin pressure is large), the negative pressure introduced into the pipe on the front side in the traveling direction of the resin C is large, and the suction due to the negative pressure is large. Due to the action, the phenomenon in which the resin C is pulled toward the traveling direction occurs, so that the resin pressure generated on the rear side C ′ of the moving resin C is reduced, while the resin pressure is reduced due to the decrease in the resin amount. In the middle and rear stages of the repair section,
The negative pressure introduced into the pipe is controlled to be small, and the suction action of the resin C due to the negative pressure is weakened, so that the resin C moving in the pipe in the repair section is not affected by the change in the resin amount at all. The resin pressure is controlled so as to be substantially constant. Further, in such a configuration, the pig apparatus 2 in which a plurality of preceding pigs 22 to 25 are connected to the front side of the lining pig 21
As shown in FIG. 1, on the front side of the disk-shaped washer 41, the outer diameter at the forefront is small, gradually increases toward the rear, and the final outer diameter is slightly smaller than the outer diameter of the pig 21. ~
A guide device in which a plurality of (44 in the embodiment) 44 are arranged at predetermined intervals via bosses 41a to 44a of the washers 41 to 44, respectively.
40 is attached, and the insertion holes 41b to 44b of the tow cable 4 formed in the boss portions 41a to 44a of the disk-shaped washers 41 to 44 of the guide device 40 are smaller as the outer diameter of the washer is smaller. This disk-shaped washer 41-44
When the curved pipe portion is inclined so that its inner end side approaches and its outer end side separates from each other, the front and rear washers overlap each other. That is, the guide device 40 has the boss portion 41a formed by forming the insertion holes 41b to 44b through which the tow line 4 is inserted in the free state.
~ 44a, the disk-shaped washers 41-44 with increasing outer diameter.
The washer 41 is
The outer diameters of 44 to 44 are smaller toward the front, and the insertion holes 41b to 44b of the tow line 4 are formed to be larger toward the front. Further, the guide device 40 is held at a constant distance from the leading pig 22 on the rear side via the joint portion 4a of the tow line 4. In addition, the disk-shaped washers 41 to 41 of the guide device 40 according to the present invention.
The outer diameter of 44 is set to the inner peripheral surface of the pipe to be repaired in order to reduce the resistance of the lining resin C injected to the front side of the preceding pigs 22 to 25 when the pig apparatus 2 is towed by winding the tow line 4. It is formed to be sufficiently smaller, and it is possible to provide an appropriate cutout on the outer diameter or to use a star-shaped washer. In such a configuration, when the pig apparatus 2 is pulled by winding the tow line 4 and the resin C is pushed along the inside of the pipe, when the repair target pipe is a straight pipe, as described above, A uniform lining coating film is formed on the surface, but when a bent pipe is used as the pipe to be repaired and there are a plurality of bent portions 1a in the repair section, as shown in FIG. The disk-shaped washers 41 to 44 of the guide device 40 installed on the front side of 25
The bent portion 1a is inclined forward with a portion in contact with the inner wall as a fulcrum and overlaps with each other. At this time, since the insertion holes 41b to 44b of the boss portions 41a to 44a of the washers 41 to 44 are large on the front side and small on the rear side, the washers 41 to 44 have a larger inclination toward the smaller diameter front side. Then, the tow line 4 of the pig apparatus 2 separates from the inner wall of the bent portion 1a as the guide device 40 approaches the bent portion 1a,
Since the tow line 4 is guided in the direction of the center line of the pipe inner surface, the tow line 4 is guided so as not to directly contact the inner wall of the bent portion 1a, and is pressed downward when the pig device 2 passes through the bent portion 1a. Since it is pulled in the advancing direction without being pulled, a uniform lining coating film can be formed on the inner surface of the pipe without increasing the required pulling force.

【The invention's effect】

Thus, according to the present invention, even when a bent pipe is used as the pipe to be repaired and there are a plurality of bent portions in the repair section, the resin injected into the pipe is pushed by the pig device to line the inner surface of the pipe. It forms a coating film, and as the pig device approaches the bend, the pulling line of the pig device is moved toward the center line side of the pipe inner surface by the guide device without directly contacting the inner wall of the bend part. You will be pulling the pig device. Therefore, unlike the conventional device, the tow rope of the pig device comes into contact with the inner side wall of the bent pipe to increase the frictional resistance during towing, and the problems such as biasing the towing direction of the pig device are eliminated. Since the pulling resistance of the pig device is reduced, the pig device can be smoothly moved.

[Brief description of drawings]

FIG. 1 is a sectional view showing a pipe inner surface lining device according to the present invention, FIG. 2 is an operation explanatory view showing a case where a guide device of the pipe inner surface lining device according to the present invention moves a curved pipe portion, and FIG. FIG. 4 is a schematic view showing the overall configuration of a repairing and constructing apparatus according to FIG. 4, FIG. 4 is an operation explanatory view of an essential part showing a conventional embodiment, and FIG. 5 is an operation explanatory view of an essential part showing a conventional embodiment. 1 ... Existing piping, 1a ... Bends, 11,12 ... Separation openings, 2 ...
Pig device, 21 ... Lining pig, 22-25 ... Leading pig, 26
... Resin flow port, 4 ... Tow line, 4a ... Joint part, 5 ... Insertion guide tube, 5a ... Resin injection port part, 5b ... Air vent part, 6 ... Outflow guide tube, 6a ... Residual resin discharge port part, 6b ... Negative pressure inlet port, 7 ... Resin filling tank, 7a ... Hose, 7b ... Generator, 7c ... Compressor, 9 ... Winch, 10 ... Vacuum pump, 10a ... Pressure adjusting unit, C ... Lining resin, 40 ... Guide device, 41-44 ... Disc washers, 41a-44a ...
Boss portion, 41b to 44b ... insertion hole.

Claims (1)

[Claims] 1. A repair resin (C) is provided in the pipe of the existing pipe (1),
Insert the pig device (2) having the pig (21) that pushes the resin (C) from the rear, and pull the pig device (2) tow the cord (4).
In the lining device that draws the resin (C) out to the rear of the pig to form a lining coating film on the inner surface of the pipe by the towing line (4) on the front side of the lining device, the forefront outer diameter is small and goes backward. A plurality of disc-shaped washers (41-44) whose diameter gradually becomes larger and the final outer diameter becomes slightly smaller than the outer diameter of the pig (21) are fixed through the bosses (41a-44a) of the washer. The guide device (40) arranged at intervals of 4 is attached, and the boss portion (4) of the washer in the guide device (40) is attached.
1a to 44a), the insertion hole (41b to 44b) of the tow line is made smaller as the outer diameter of the washer (41 to 44) becomes larger, and the lining device is pulled by towing the tow line (4). When the pipe moves along the bent part (1a) of the pipe, the disk-shaped washers (41 to 44) are inclined at the bent part (1a) so that the inner ends of the washers (41a) approach and the outer ends of the washers (41a) move away from each other. A guide device for a pipe inner surface lining device, which is configured to support 4) so as to be closer to the center line direction of the pipe inner surface.