JPH08150362A - Suction device for existing pipe lining method - Google Patents

Abstract

PURPOSE: To provide a suction device of an existing pipe lining method constituted to regulate an in-pipe lining speed at the time of a stage for suction lining of a resin by a suction effect of a suction pump and to assure the easy and failproof checking as to whether plural pigs are recovered from the inside of the pipe or not. CONSTITUTION: This suction device has the suction pump which sucks and discharges the liquid in the pipe from a pipeline, a recovering tank which recovers the sucked liquid, a pig passage detecting means (constituted by connecting a detecting part 30 and alarm part 31 by a cord 32) which emits an alarm by detecting and counting the pigs when the pigs pass and a valve means 35 with an orifice which has an effect of regulating the lining speed and once stops the pigs to be recovered.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is intended for repairing a supply pipe branched from a conduit, and in the first step, a necessary amount of liquid resin required for lining the inside of the supply pipe is supplied to the ground above the end of the supply pipe. The whole amount of the resin plug is transferred to the branch position on the conduit side by the liquid flow introduced into the pipe from the opening portion and press-fitted from the rear side, and in the second step, the suction pump connected to the above ground opening portion of the inside of the pipe In the second step of the lining repairing method for the inner surface of the pipe, in which the liquid flow is sucked and discharged and the suction force pulls back the resin plug to the end side of the supply pipe to apply the resin to the inner surface of the pipe to form a lining. The present invention relates to a suction device for sucking and discharging the.

[0002]

2. Description of the Related Art As a lining construction method as described above, the present applicant has proposed a repair construction method as described in Japanese Patent Application Laid-Open No. 4-1147773.

In this repair method, when a supply pipe branched toward a demand destination from a conduit laid under the road is targeted, a meter provided at the end side of the supply pipe is removed as a repair method by non-excavation. This is used as a ground opening, and in the first step, a liquid flow of a required amount of liquid resin required for lining the inside of the supply pipe is introduced into the pipe in the form of a plug and is press-fitted into the rear pipe through the ground opening. The whole amount of the resin plug is transferred to the branching position on the conduit side by the, and in the second step, the liquid flow is sucked and discharged by the suction pump connected to the opening on the ground, and the suction force pulls the liquid plug back to the end side of the supply pipe. The resin is applied to the inner surface of the pipe by the flow of, and repair work is performed to form a required lining film.

[0004]

When carrying out this repairing method, as a suction device in the second step, a pig stopper connected to the above-ground opening of the supply pipe and a connecting hose are connected to the pig stopper. A recovery tank for the liquid flow, which is communicated through the suction tank, and a suction pump, which is connected through a hose so as to communicate with the upper space of the recovery tank, are configured. Due to the suction action of the pump, the liquid flow introduced into the pipe in the previous step is sucked out, and the resin plug is drawn back to the end side of the supply pipe to apply the resin to the inner surface of the pipe to form the required lining film. .

By the way, the suction device used in the above-described conventional lining method has some problems as described below. One of them is that when performing suction lining construction, it is not easy to confirm whether or not multiple pigs that were introduced into the pipe during the preceding process were collected, and in particular,
Since it is not possible to easily confirm the passage of the finally collected leveling pig for lining construction, the suction pump cannot be stopped in a timely manner, so the amount of gas sucked and discharged from the inside of the supply pipe cannot be minimized. Therefore, due to excessive suction and discharge of gas, inconvenience is likely to occur on the lining application surface immediately after formation on the inner wall of the conduit.

Secondly, since no means for adjusting the suction force of the pump is provided on the suction lining system path, the lining speed in the pipe cannot be controlled in a predetermined manner, so that a desired lining film can be applied. Have difficulty.

Thirdly, even if a pig passage detector is provided on the suction lining system path to confirm the passage of the leveling pig for lining construction, the pig may pass too quickly due to the suction force of the pump. Therefore, the pig passage detector often did not respond.

In view of the above-mentioned problems, the present invention controls the in-pipe lining speed to a predetermined level during the step of suction-lining the resin by the suction action of the suction pump, and at the same time, a plurality of pigs, especially the pig to be collected last, It is an object of the present invention to provide a suction device of the existing pipe lining construction method, which allows easy and reliable confirmation of whether or not it has been recovered.

[0009]

In order to achieve the above object, the present invention aims to repair a supply pipe branched from a conduit, and to provide a necessary amount of liquid resin necessary for lining the inside of the supply pipe. In the first step, the entire amount of the resin plug is transferred to the branch position on the conduit side by the liquid flow that is introduced into the tube in the form of a plug from the above-ground opening at the end of the supply pipe, and is press-fitted from the rear of the tube. The liquid flow in the pipe is sucked and discharged by the suction pump connected to the opening, and the suction force pulls the resin plug back to the terminal side of the supply pipe to apply the resin to the pipe inner surface to form the lining. In the lining repair construction method, at the time of the second step, the above-mentioned opening of the supply pipe is connected to the recovery tank for the liquid flow, which is communicated via the connection hose, and the hoses so as to communicate with the upper space of the recovery tank. A suction pump connected via a suction line is provided, and when a pig passes through the suction line system between the recovery tank and the pipeline side, it detects it.
The present invention is characterized in that a pig passage detection means for counting and issuing an alarm and a valve means for adjusting the lining speed and for temporarily stopping the recovered pig are interposed.

According to the present invention, the detecting portion of the pig passage detecting means is positioned immediately before the valve means,
Another feature is that the pig is detected by the suction force of the pump and temporarily stopped by the valve means.

Further, according to the present invention, the valve means temporarily stops the pig returned by the suction force of the pump so that the pig passing detection means detects the pig, and then receives the valve opening signal to receive the pig. The valve is opened so that the valve passes through and the valve closes again after passing the pig, but the last pig return is detected.
Another feature is that the valve closed state is continuously maintained without receiving the valve opening signal after being counted.

According to the present invention, the pig passage detecting means is
A detection switch and a reversible rubber member that is formed so as to cover the push button of the detection switch, has an operating portion that normally protrudes into the tube, and is pushed by the pig to retract in the opposite direction when passing the pig, and an alarm Another feature is that it is provided with an alarm unit for issuing.

Still another feature of the present invention is that the valve means is a ball valve that forms an orifice passage that connects the upstream side and the downstream side of the fluid passage when the valve is closed.

[0014]

In the second step, a pig passage detecting means is provided on the suction passage between the liquid recovery tank and the pipeline to detect and count a pig when it passes and give an alarm. Therefore, during the suction lining process, it is possible to easily confirm whether or not the multiple pigs that were introduced into the pipe in the preceding step were collected from the pipe, and especially for the leveling pig for lining construction that was collected last. Since the return can be confirmed, the gas suction / discharge amount from the inside of the pipe can be minimized by stopping the suction pump at a proper timing.

Further, immediately after the pig passage detection means on the suction line system, valve means having an orifice for adjusting the lining speed and temporarily stopping the recovered pig is interposed, so that the pipe lining speed is increased. In addition to the adjustment of, the pig returning detection means can reliably detect the returned pig due to the suction force of the pump.

[0016]

Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 shows the first step (by the liquid flow,
(Injection and transfer of resin in a pipe). As shown in FIG. 1, in the first step, as a means for injecting the liquid flow introduced from the above-ground opening of the supply pipe, a liquid tank 9, a liquid feed pump 10, and a liquid fed from the pump And a liquid flow control device 20 for controlling the flow, which are connected in series to the conduit side via hoses 12, 13 and 15. R in the figure is a hose for returning the excess liquid to the liquid tank so as to keep the liquid pressure during liquid feeding constant.

In the first step, the leveling pig 3 for lining construction is introduced into the supply pipe 7, and the resin injection device 11 is used to open the resin above the ground with the liquid pressure obtained by the operation of the liquid feed pump 10. Inject into the tube from the portion 14. After that, the resin conveying pig 4 and the liquid absorbing material 5 with the same hydraulic pressure using the pig cassette 8
And the liquid blocking pig 6 is introduced into the pipe. Next, by continuously operating the liquid feed pump 10, the liquid B is sucked / pressurized from the liquid tank 9 and injected into the supply pipe 7 via the liquid flow control device 20, so that the resin A is introduced into the conduit. 1 is transferred to branch position 2.

FIG. 2 shows a second arrangement of the suction device of the present invention.
The process (suction lining) is shown. In the second step,
The liquid flow B in the pipe is sucked and discharged by the suction pump 16,
Due to the suction force, the resin plug is pulled back to the terminal side of the supply pipe 7 to apply the resin to the inner surface of the pipe to form a lining film.

As shown in FIG. 2, the suction device of the present invention comprises:
A suction pump 16 that sucks and discharges the liquid that has been injected into the supply pipe in the preceding step and a recovery tank 17 that recovers the sucked liquid are connected to the supply pipe side. Further, as shown in FIG. 2 and FIG. 3, when the pig passes on the suction system path between the recovery tank 17 and the supply pipe 7, it detects and counts the pig, and issues a warning. And an alarm unit 31 are connected by a cord 32), and a valve means 35 which has a function of adjusting the lining speed and temporarily stops the pig to be collected.

As shown in FIGS. 2 and 3, the valve means 35 and the supply pipe 7 are communicated with each other by the transparent hose 18, so that the pigs returning from the pipe line pass by the suction force of the pump. Is visible from the outside.

4 and 5 show the details of the detection unit 30 and the valve means 35 of the above-mentioned pig passage detection means. As shown in FIGS. 4 and 5, the detection unit 30 that constitutes a main part of the pig passage detection unit is a valve unit 35.
It is equipped with a detection switch 30a having a push button 30a 'attached to the immediately preceding wall portion of the tube, and a rubber reverse rubber contact 30b formed so as to cover the push button 30a' (FIG. 5). ing.

The detection switch 30a is mounted by screwing from the outside at the pipe wall portion (pre-formed opening) immediately before the valve means 35. The inverted rubber contact 30b is fixed to the same wall portion so as to cover the push button 30a 'of the detection switch 30a and to face the inside of the tube (FIG. 5). The inverted rubber contact 30b normally has an operating portion 30b 'that projects into the pipe and is pushed by the pig when the pig passes to retract in the opposite direction.

The valve means 35 is provided immediately after the detecting portion 30 of the pig passage detecting means, and the valve body 3 is provided.
7 and the valve operating portion 36. The valve operating portion 36 has a cylindrical central space portion 36 a, and a spherical portion on both sides thereof has a pair of orifices 36 facing each other.
b is formed. FIG. 4 shows a closed state of the valve means. However, when the pigs do not reach, the upstream side and the downstream side of the valve means 35 are connected to each other to some extent by the pair of orifices 36b facing each other. Has become.

As shown in FIG. 4, when the pig 40 is sucked from the conduit and reaches just before the valve means 35, the pig 40 is stopped by the valve means 35.
The operating portion 30b 'of b is struck by the pig 40 and pushed to the opposite side. As a result, the push button 30a 'of the detection switch 30a is pressed, the passage of the pig is detected and counted, and the buzzer of the alarm unit 31 starts to sound.

Further, as shown in FIG. 5, the valve means 35
When the detection of passage of the pig is completed, the valve opens to allow the pig 40 to pass and the valve is closed again after passing the pig, but the last pig return is detected and counted. After that, the valve closed state is continuously maintained without receiving the valve opening signal. Therefore, the last pig blocks the orifice 36b by the valve means 35 (FIG. 4).
It becomes a state where it is not passed through. The pigs that have passed therethrough are stored in the resin separating means 29 provided in the recovery tank 17.

As described above, when a plurality of pigs successively pass in front of the above-mentioned inverted rubber contact 30b, the respective passages are detected and counted. After the return of the leveling pig 3 for lining construction, which is the last pig to be collected, is detected, the valve closed state of the valve means 35 is maintained as it is,
The pair of orifices 36b in the valve operating unit 36 are blocked by the leveling pig 3, so that the gas discharge in the pipe is immediately stopped (see FIG. 4). At the same time, the operation of the suction pump 16 can be stopped immediately by detecting and counting the last pig return, so that it is possible to minimize the amount of gas suction and discharge from the pipe. You can

Immediately after starting the second step (suction lining) in which the suction device of the present invention is arranged, the valve means 35 is operated so as to be closed in order to adjust the suction lining speed. As described above, even when the valve means 35 is closed, the pair of orifices 36b facing each other still allows the upstream side and the downstream side of the valve means 35 to communicate with each other to some extent. By adjusting the force, the pipe lining speed can be adjusted.

[0028]

According to the present invention, when the pig passes on the system line of the suction line between the liquid recovery tank and the pipe side, the pig is detected and counted and an alarm is issued during the second step. Since the passage detection means is interposed, during the suction lining step, it is possible to easily confirm whether or not the plurality of pigs introduced into the tube in the preceding step are recovered from the tube, and particularly, the last is recovered. Since the return of the leveling pig for lining construction can be confirmed, the amount of gas suction and discharge from the inside of the pipe can be minimized by immediately stopping the operation of the suction pump. Therefore, various inconveniences caused on the coated surface of the in-tube lining immediately after formation due to excessive gas suction and discharge can be avoided.

Further, since valve means having an orifice for adjusting the lining speed and temporarily stopping the pig to be recovered is interposed on the system line of the suction line between the liquid recovery tank and the pipeline side. Not only can the in-pipe lining speed be adjusted, but the pig returning detection means can reliably detect the returning pig due to the suction force of the pump. Therefore, by adjusting the lining speed, a desired lining film can be formed, and various inconveniences caused on the coated surface of the pipe lining immediately after formation due to excessive gas suction / exhaustion can be avoided.

Since the operation of the suction pump can be finished in a timely manner, the efficiency of the lining construction is improved.

Furthermore, since the pig stop device required in the prior art can be omitted, the suction lining device can be simplified.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a first step (injection / transfer of resin in a pipe by a liquid flow).

FIG. 2 is an explanatory view showing a second step (suction lining) in which the suction device of the present invention is arranged.

FIG. 3 is a front view showing an integrated pig passage detection means and valve means.

FIG. 4 is a cross-sectional view showing a pig passage detection unit and a valve unit.

FIG. 5 is a cross-sectional view showing a pig passage detection means and a valve means.

[Explanation of symbols]

 16 Suction Pump 17 Recovery Tank 30 Detection Section 30a Detection Switch 30a 'Push Button 30b Reverse Rubber Contact 30b' Operation Section 31 Alarm Section 35 Valve Means 36 Valve Operation Section 36a Central Space Section 36b Orifice 37 Valve Body

Claims (5)

[Claims] 1. A repair target is a supply pipe branched from a conduit, and a necessary amount of liquid resin required for lining the inside of the supply pipe is plugged into the pipe from a ground opening at the end of the supply pipe in the first step. Is introduced and the liquid flow is pressed in from the rear to transfer the entire amount of the resin plug to the branch position on the conduit side, and in the second step, the liquid flow in the pipe is sucked and discharged by the suction pump connected to the above ground opening. In the lining repairing method for the inner surface of the pipe, in which the resin is applied to the inner surface of the pipe to form a lining by the flow of the resin plug that is pulled back to the end side of the supply pipe by the suction force, the above-mentioned opening of the supply pipe is performed during the second step. And a suction pump connected via a hose so as to communicate with the inside of the upper space of the recovery tank. On the system of the suction line between the recovery tank and the pipeline side, when the pig passes, it detects and counts it and issues a warning, and a pig passing detection means, which has the function of adjusting the lining speed and the pig to be recovered once. A suction device for an existing pipe lining method, characterized in that a valve means for stopping is interposed. 2. The detecting portion of the pig passage detecting means is positioned immediately before the valve means, and is configured to detect a pig which is returned by the suction force of the pump and temporarily stopped by the valve means. The suction device of the existing pipe lining method according to claim 1. 3. The valve means temporarily stops the pig so that the pig returned by the suction force of the pump is detected by the pig passage detecting means, and then receives the valve opening signal to pass the pig. As shown in the figure, the valve opens and closes again after passing the pig.However, after the last pig return is detected and counted, the valve open signal is not received and the closed state continues to be maintained. The suction device of the existing pipe lining construction method according to claim 1. 4. The pig passage detection means is formed so as to cover a detection switch and a push button of the detection switch,
2. A reversible rubber member having an actuating portion that normally projects into the pipe and is pushed by the pig to retract in the opposite direction when passing the pig, and an alarm portion for issuing an alarm. The suction device of the existing pipe lining method described. 5. The existing pipe lining according to claim 1, wherein the valve means is a ball valve that forms an orifice passage that connects the upstream side and the downstream side of the fluid passage when the valve is closed. Construction method suction device.