JP2782308B2 - Hydraulic flow control device for pipe inner lining repair method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas pipe in which a supply pipe for drawing gas or the like to a demand destination is branched from a pipe line laid under a road such as a gas pipe. A first step of transferring the liquid resin from the end opening of the supply pipe to the branch position on the conduit side by hydraulic flow for the purpose of regenerating the inside of the pipe, and a step of transferring the introduced resin to the end side of the supply pipe by suction of the hydraulic flow The present invention relates to a hydraulic flow control device for automatically stopping the supply of hydraulic flow when performing a repairing method including a second step of applying the coating to the inner surface of the pipe while applying the lining while pulling back the hydraulic flow.

[0002]

2. Description of the Related Art A repair method for introducing a liquid resin into a supply pipe as described above and applying a lining to the supply pipe has been well known. As a method of repairing it, a method of opening a resin injection port at one end of a supply pipe to be constructed and a recovery port for surplus resin at the other end at two locations is adopted.
It is necessary to excavate the branch section on the side of the conduit laid under the road to cut and open the connection point with the supply pipe, which involves cutting off the road and cutting the road and cutting the branch section,
Also, after the repair, post work such as backfilling of the excavation trench and pipe knotting is required, so that there is a problem that the repair work requires a great deal of labor, time and cost.

Therefore, as a countermeasure for solving such a problem, a non-drilling method which can lining the inner wall of a supply pipe without digging and cutting and opening a branch portion of a conduit laid under a road has heretofore been proposed. As a repair method, the present applicant has previously proposed a repair method described in JP-A-4-114773.

In this prior art, an opening as a resin injection port is provided at the end of a supply pipe branched from a conduit, and the opening is used to reduce the amount of resin required for lining the inside of the pipe in the first step. The resin is introduced in the form of a plug, the entire amount of the resin is once transferred to the branch position on the conduit side by air pressure from the rear, and in the second step, the introduced resin plug is pulled back by the suction action from the end side of the supply tube while the inner surface of the tube is being pulled. The repair is basically applied to the lining by applying it to the lining.

[0005] According to such a repair method, it is not necessary to dig up the conduit laid under the road to cut and open the connecting portion, so that the problems associated with the road digging described above are solved. This has the advantage that the repair work can be performed efficiently. However, air has compressibility, and when resin is transferred using air pressure, if there is a narrow or wide portion in the pipeline inner diameter, for example, if the inner diameter of the pipeline has a narrow portion or a wide portion, the resin changes due to a change in the traffic condition. The pressure of the air pressure applied to the rear part of the plug causes a pressure change due to the volume change accompanying the compression of the air, which causes a phenomenon that the top of the resin plug inadvertently blows forward during transfer. However, there is a problem that the resin ejected to the front thereof flows into the conduit when reaching the branch position on the conduit side.

Therefore, as a means for transferring the resin, a method of transferring the resin by using an incompressible hydraulic pressure flow as disclosed in Japanese Patent Application Laid-Open No. 61-181574, for example, instead of air pressure. Is considered.

[0007]

By the way, in the case of the conventional repair method using hydraulic flow, the water supply path of the pump is simply provided with a water meter, and the amount of water from the start of water supply is monitored, and the amount of water supply is determined in advance. When the calculated predetermined amount is reached, means for manually stopping the water supply by the pump by the operator has been adopted.

[0008] Therefore, there is an inconvenience in workability that the worker must be resident at the water supply place and constantly monitor the water meter during the repair work. In addition, when the operator stops the water supply by the pump, a shift occurs in the stop timing, and when the amount of water supplied into the pipe is too large, the movement of the resin plug overruns from a predetermined stop position and starts. If the resin flows into the conduit or if the amount of water supplied is insufficient, the movement of the resin plug stops short of the predetermined stop position, causing inconvenience such as the occurrence of unlined parts in the pipe. There was a problem that the flow of the resin could not be accurately transferred to the home position due to the flow.

According to the present invention, in the repairing method employing the above-described method of transferring a resin by using a hydraulic flow, the supply and stop of the hydraulic flow are automated to improve the workability of the repair and to reduce the amount of water supply. It is an object of the present invention to provide a hydraulic flow control device for a pipe inner surface lining repair method capable of accurately controlling the transfer of a resin to a predetermined position.

[0010]

In order to achieve this object, the present invention aims at repairing a supply pipe branched from a conduit to reduce a necessary amount of resin required for lining the inside of the supply pipe. In one step, the entire amount of the resin plug is transferred to the branch position on the side of the conduit by hydraulic pressure flow by introducing the plug into the pipe from the terminal opening of the supply pipe, and in the second step, the resin plug is sucked by the hydraulic flow to supply pipe. In the lining repair method of the inner surface of the pipe, which is applied to the inner surface while being pulled back to the end side of the lining, a hydraulic pressure control device is provided between the end opening of the supply pipe and a water supply pump connected thereto. The water pressure flow control device counts a water pressure governor that keeps the water sent from the water suction pump at a constant water pressure, a flow meter that measures the flow rate and outputs the flow rate as a pulse signal, and a pulse signal from the flow meter. hand A counter for generating a stop signal for counting up feed water pump when it is because the set was water, characterized by comprising an electromagnetic valve that blocks the hydraulic flow by the stop signal from the counter.

[0011]

According to the present invention, when the resin is transferred by the hydraulic flow at the time of the repair work, when the required amount of water calculated in advance corresponding to the transfer distance is supplied, the pump is automatically operated. Is stopped and the water supply is cut off, so that it is not necessary for the worker to stay at the water supply place and constantly monitor the water supply amount, and the construction work can be automated.

Moreover, in this case, the water pressure flow supplied to the rear of the resin plug becomes a stable constant pressure by the governor provided in the control device, and the water amount is accurately measured by the pulse, and the water supply amount becomes the preset water amount. When the water pump is stopped and the solenoid valve is closed to shut off the water supply, if the set water amount is preset in the counter, a constant pressure and a constant amount of water can be automatically supplied even if the flow meter is not carefully watched. Since the extra water is not supplied, the moving distance of the resin plug becomes accurate, and the resin can be accurately transferred to a predetermined home position.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a first step of the pipe inner surface lining repair method to which the present invention is applied, and FIG. 2 shows a subsequent second step. In these FIGS. 1 and 2, 1 is a conduit laid under a road, 2 is a supply pipe branched off from the conduit 1 and drawn into the residential land. A meter stand 2a extending toward the ground is connected. Usually, a gas meter (not shown) of a demand destination is attached to the upper end of the meter standing pipe 2a, but the opening is used as a resin and hydraulic pressure flow inlet by removing the meter at the time of this repair.

In the first step shown in FIG. 1, a lining pig 3 is arranged at the top of the meter stand pipe 2a from the upper end opening thereof, and the resin A for repair is formed into a plug in a liquid state at the subsequent stage. be introduced. The introduction of the resin A is performed by, for example, connecting a manual type resin injection tank 4 as an example to the upper end opening of the meter standing pipe 2a and pressing down the piston 4a to reduce the amount of the resin A contained in the tank. The amount of the resin A to be introduced here is a necessary amount calculated from the relevant conditions such as the length of the supply pipe 2 to be repaired, the inner diameter of the pipe, and the thickness of the coating film to be formed.

After the resin A has been introduced, another pig cassette 5 is replaced and connected to the opening at the upper end of the meter stand 2a. In the pig cassette 5, a spherical pressing pig 11 which pushes and moves the entire amount of the resin A without leaving the resin A introduced into the tube.
A water-absorbing material 12 having a required water-absorbing capacity and a spherical water-impervious pig 13 are housed. The other end of the pig cassette 5 is connected to the tip of a water supply hose 6 extending from a water feed pump 8. You.

In the present invention, a water pressure flow control device 7 described below is provided between the water supply pump 8 and the water supply hose 6, and the water suction side of the water supply pump 8 is connected to a water tank 9.

In the first step, the water in the water tank 9 is sent to the water supply hose 6 through the hydraulic flow control device 7 by driving the water supply pump 8, and the hydraulic flow is transmitted to the pig cassette 5.
When the water is supplied to the inside, a water pressure acts on the rear of the pressing pig 11, the water absorbing material 12, and the water-blocking pig 13 housed in the pig cassette 5, and the water pressure is generated in the pipeline before and after the resin plug A. Due to the pressure difference, the resin plug A moves inside the supply pipe 2 toward the conduit 1 with the lining pig 3 at the head, and when the leading lining pig 3 reaches the branch position on the conduit 1, the water is supplied. To stop the movement of the resin plug A.

During the movement of the resin plug A, a water-blocking pig 13 is provided between the hydraulic pressure flow from the rear and the resin plug A.
Even if the water absorbing material 12 and the pressing pig 11 are interposed, and water leaks from the peripheral gap of the water blocking pig 13 and flows forward due to the pressure of the hydraulic pressure flow, the water is absorbed by the water absorbing material 12 and is blocked. Since the water function becomes two-stage, mixing of water into the resin plug A is completely avoided.

The moving distance of the resin plug A is determined by the length of the lining pig 3 introduced into the conduit from the total length of the conduit from the upper end opening of the meter standpipe 2a to the branch position on the conduit 1 side.
→ Resin plug A → Pressing pig 11 → Water absorbing material 12 → Water to be fed into the pipe from the pipe volume based on the remaining pipe length obtained by subtracting the length from the pipe length from the length of the pipe. Is calculated by the calculation, and when the water supply is stopped when the amount of the water is supplied, the resin plug A stops moving at a distance where the leading lining pig 3 reaches the branch position on the conduit 1 side. .

Following the first step described above, the second step shown in FIG.
In the process, the connecting cylinder 14 is connected to the upper end opening of the meter standing pipe 2a.
The collection tank 15 is connected via a
The vacuum pump 81 is connected via the. Connection tube 14
The water-impervious pig 13 and the water-absorbing material 1
2. A pig stop 17 for receiving the pressing pig 11 and the lining pig 3 is interposed. In the second step, the water (water remaining in the supply pipe 2 and the meter standing pipe 2a) fed in the previous first step by the suction action of the vacuum pump 81 is successively absorbed by the operation of the vacuum pump 81, and Collected in
Along with this, the resin plug A fed to the branch end on the side of the conduit 1 moves so as to be pulled back in the direction opposite to the first step. In this step, the lining pig 3 follows the tail of the resin plug A, and a coating film of a required thickness is formed on the inner wall of the supply pipe 2 and the meter standing pipe 2a by the lining pig 3 in the step of being pulled back. The lining is applied to the entire area of the supply pipe 2 including the meter standing pipe 2a.

In the above-described second step, prior to the movement of the resin plug A to be pulled back, the water-blocking pig 11 wipes off the water on the inner wall of the pipe, and then the water-absorbing material 12 removes the water adhering to the inner wall of the pipe. Is further absorbed and removed, water bubbles are not generated in the coating film formed by the subsequent resin plug A, and proper lining construction is achieved.

FIG. 3 shows the internal structure of the hydraulic flow control device 7, and the frame 2 is made of an angle material or the like.
0, a water pressure governor 22, an input side pressure gauge 23, and a strainer 24 from the water supply pump 8 side through a pipe 21.
, A flow meter 25, a needle valve 26, and a solenoid valve 27
And an output side pressure gauge 28 are connected in order. One end of the pipe 21 is connected to the water supply pump 8 as a pump connection port 21a, and the other end is connected to the water supply hose 6 as a water supply port 21b. The flow meter 25 has a counter 2
9 are electrically connected.

The above members will be described in order from the side of the water supply pump 8. When the water pressure in the pipe 21 becomes equal to or higher than a predetermined pressure, the governor 22 releases water from the spring valve 21c.
By flowing to the side, the water pressure in the pipe 21 is made constant, and the water discharged from the discharge port 21 c is returned to the water tank 9. When such a hydraulic governor 22 is used, it is necessary to make the water discharge pressure of the water supply pump 8 higher than a necessary pressure. Of course, a water pressure regulator other than this type can also be used. An input pressure gauge 23 is provided downstream of the hydraulic governor 22. The input-side pressure gauge 23 is provided to check whether the water pressure has an appropriate value. The subsequent stage is provided with a strainer 24 to prevent dust and the like from entering the flow meter 25. The strainer 24 may be provided before the position shown in the drawing.

The flowmeter 25 is connected to a well-known cup-type flowmeter and a rotation-pulse signal converter called an encoder, and outputs a pulse wave proportional to the rotation amount of the cup, and is generally called a CN-type flowmeter. Things. Although the flow meter 25 has a display unit for indicating the integrated flow rate, the integrated flow rate is not directly related, and only the count number of the pulse wave from the start of the lining work described later is used. is there. The needle valve 26 is a throttle valve for adjusting the output water flow rate in the hydraulic pressure flow control device 7, and sets the water flow rate so as to match the transfer speed of the lining resin obtained experimentally or by calculation in advance. Is what you do. The solenoid valve 27 is normally in an open position and is a valve that closes in response to a signal of a set water amount output from a counter 29 described later. When the valve closes, the hydraulic flow stops immediately. At this time, the water supply pump 8 also stops at the same time or slightly later, and the water sent from the water supply pump 8
The water is discharged from the discharge port 21c via the hydraulic governor 22.

The output pressure gauge 28 confirms the pressure of the water supply port 21b, which is the outlet of the hydraulic flow control device 7, that is, the pressure of the hydraulic pressure applied as the back pressure of the lining resin. With the above configuration, from the water supply port 21b,
The metered water flow of a constant pressure is supplied from the meter stand 2a into the supply tube 2 via the water supply hose 6, and when a certain amount is supplied, the water supply is automatically stopped.

The counter 29 electrically connected to the flow meter 25 has an operation and display surface shown in FIG.
When the number of pulse signals from 5 is counted and coincides with the preset number of signals, a coincidence signal is output to the outside,
There is a count display section 30 for converting and displaying the number of pulses output from the flow meter 25 in units of 0.01 liter, and a setting display section 31 for displaying a preset water flow rate in units of 0.01 liter. At the time of use, the numerical value of the count display unit 30 and the setting display unit 31 is set to zero by the reset key 32,
While changing the number of blinking digits of the setting display section 31 sequentially with the blinking digit change key 33, the required water amount is set for each digit with the numerical value change key 34. When the required amount of water is set, the setting key 35 is pressed to complete the setting of the amount of water.

In the first step, as described above, the hydraulic flow supplied from the pump 8 by driving the water supply pump 8 is introduced into the pig cassette 5 by the water supply hose 6 through the pipe 21 in the hydraulic pressure control device 7. The supply of the hydraulic pressure flow causes the impervious pig 1 stored in the pig cassette 5.
The resin plug A and the lining pig 3 move toward the branch position on the side of the conduit 1 via the water absorbing material 12 and the pressing pig 11 through the supply pipe 2. At this time, when the flow meter 25 starts measuring the flow rate of the hydraulic flow with the start of water supply from the pump 8, the pulse signal enters the counter 29, is converted into liter, is displayed on the count display section 30, and is constantly displayed. , Is compared with a set value corresponding to a preset water amount. When the number of pulses input from the flow meter 25 matches the previously set value of the amount of water, a signal is generated from the circuit, amplified by the amplifier, and sent to the solenoid valve 27. Then, the electromagnetic valve 27 closes and the water flow stops immediately.

In this way, the water pressure flow can be automatically and accurately controlled in the pipe inner surface lining repair method, and the work can be performed much more easily as compared with the conventional visual water flow measurement. . Escape key 3
Reference numeral 6 denotes a mode switching key, which sets the display amount of the count display unit 30 to the integrated water amount that can be reset as described above.
It is a key that can be switched to a total accumulated water amount indicating a past total passing water amount and an instantaneous flow rate (flow rate per minute or per second). In the instantaneous flow rate mode, it is used when adjusting the needle valve 26 to set the water flow rate to match the required transfer speed of the lining resin A.

[0029]

According to the present invention, as described above, when the resin is transferred by hydraulic flow in the first step of the repair work, a required amount of water calculated in advance corresponding to the transfer distance is reduced. When the water is supplied, the pump stops automatically and the water is cut off.
There is no need to monitor the amount of water supply, and the construction work can be automated.

Further, in this case, the water pressure flow supplied to the rear of the resin plug becomes a stable and constant pressure by the governor provided in the control device, and the water amount is accurately measured by the pulse, and the water supply amount becomes the preset water amount. When the water pump is stopped and the solenoid valve is closed to shut off the water supply, if the set water amount is preset in the counter, a constant pressure and a constant amount of water are automatically supplied even if the flow meter is not carefully watched. Since the extra water is not supplied, the moving distance of the resin plug becomes accurate, and the resin can be accurately transferred to a predetermined home position.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a procedure of a first step of a pipe inner surface lining repair method.

FIG. 2 is an explanatory diagram showing a procedure of a second step of the lining repair method according to the first embodiment.

FIG. 3 is a schematic diagram of a hydraulic flow control device according to the present invention.

FIG. 4 is a schematic diagram of a counter in the hydraulic pressure flow control device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Conduit line 2 Supply pipe 2a Meter stand 3 Lining pig 4 Resin injection tank 5 Pig cassette 6 Water supply hose 7 Hydraulic flow control device 8 Water pump 9 Water tank tank 11 Pressing pig 12 Water absorbing material 13 Waterproof pig 14 Connection tube 15 Recovery tank 16 Hose 17 Pig stop 20 Frame 21 Pipe 21a Pump connection port 21b Water supply port
21c outlet 22 water pressure governor 23 input side pressure gauge 24 strainer 25 flow meter 26 needle valve 27 solenoid valve 27 28 output side pressure gauge 29 counter 30 count display section 31 setting display section 32 reset key 33 setting key 34 numerical change key

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-2-9474 (JP, A) JP-A-1-236973 (JP, A) JP-A-1-293169 (JP, A) JP-A-4- 293577 (JP, A) JP-A-4-298270 (JP, A) JP-A-6-226185 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B05C 7/06-7 / 08 B05D 7/22 F16L 55/16 F16L 58/10

Claims (1)

(57) [Claims] In a first step, a required amount of resin required for lining the inside of the supply pipe is plugged into the supply pipe from an end opening of the supply pipe in a first step with the supply pipe branched from the conduit path as a repair target. The entire amount of the resin is transferred to the branch position on the side of the conduit by the hydraulic flow introduced from the rear thereof, and in the second step, the resin plug is applied to the inner surface of the supply pipe while being pulled back to the end side of the supply pipe by suction of the hydraulic flow. In the lining repair method for the inner surface of a pipe to be lined, a hydraulic pressure control device is provided between an end opening of the supply pipe and a water supply pump connected thereto, and the hydraulic flow control device is provided by A water pressure governor that keeps the supplied water at a constant water pressure, a flow meter that measures the flow rate and outputs the flow rate as a pulse signal, and counts the pulse signal from the flow meter and counts when a preset water volume is reached. A counter for generating a stop signal up to the pump, it hydraulic flow control device of the inner surface lining repair method, wherein comprising an electromagnetic valve that blocks the hydraulic flow by the stop signal from the counter.