JPH0722736B2 - Pipe inner surface lining repair method - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

INDUSTRIAL APPLICABILITY The present invention aims to repair an inner pipe lining for an existing pipe in a form in which a supply pipe drawn into a demand destination is branched from a conduit line laid under a road such as a gas pipe or a water pipe. It is related to the construction method.

[Prior art]

In general, existing pipes laid underground such as gas pipes and water pipes may leak due to corrosion holes and loosening of joints with the passage of time. As a repair and repair, the inner surface of the pipe is repaired by lining it with resin while it is still buried. As such a repairing method, for example, as described in JP-A-63-65983, liquid resin is introduced in a plug shape from the opening at one end of the existing pipe to fill the inside of the pipe, and before and after the resin plug. There has been proposed a repairing method in which a pressure difference is generated in the pipe to cause the resin plug to flow toward the other opening side, and by this progress, a lining having a required film thickness is applied to the inner surface of the pipe. In the above-mentioned prior art, a launcher is connected to one end of an open existing pipe, a resin for lining is filled from a resin tank connected to the launcher to form a resin plug in the launcher, and the launcher is free to use. The pressurized gas supplied from the end side is supplied into the existing pipe. Then, the resin plug flows in the existing pipe under the pressure of the pressurized gas,
When the resin is consumed by the lining and blows through,
The number of times of introducing the resin plug from the resin tank through the launcher is repeated again to extend the lining region so that the resin lining can be applied to the entire length of the inner surface of the existing pipe over a predetermined length.

[Problems to be Solved by the Invention]

The problem here is that in the existing pipeline where the supply pipe leading to the demand destination is branched from the pipeline (branch pipe or main pipe) laid under the road, the inside of the pipeline is lined. Sometimes, a part of the resin plug is pushed by the pressurized gas to enter the branch pipe and close the branch port. The resin that has entered the branch pipe is returned to the inside of the conduit due to the internal pressure drop in the conduit during the lining process or the final stage, and finally it is allowed to enter the inside of the branch pipe again during the finishing process in the conduit and is lined. It is necessary to dispose of it as a layer or by discharging it from the branch pipe to the outside, but if the amount of residual resin returned to the inside of the conduit at the location corresponding to each branch is not constant, The capacity of the resin plug in the pipe becomes unstable during the finishing lining of the passage, which may change the resin flow rate and cause unevenness of the lining film thickness to be applied. Such non-uniformity of the film thickness must be avoided as the result of losing the significance of the control of precisely adjusting the resin flow rate by computer control or the like to make the lining film thickness uniform. The present invention has been made based on the above circumstances, and prior to the finishing lining construction of the conduit, quantification of the invading resin (residual resin) returned from the inside of the branch pipe to the inside of the conduit, and thereby the final It is an object of the present invention to provide a lining repairing method for the inner surface of the pipe, which can stabilize the capacity of the resin plug in the pipe in the finishing lining of the conduit and perform the finishing treatment while maintaining the uniformity of the lining film.

[Means for Solving the Problems]

As means for achieving this object, the present invention firstly
For the supply pipe branched from the conduit, a liquid resin is introduced into the pipe from its end opening so as to fill the pipe, and a pressure difference is generated in the pipe before and after the resin plug to form the resin plug. A flow pipe is made to flow to the side of the conduit, and a lining film is formed on the inner surface of the supply pipe by the progress to perform a supply pipe lining step, and then the pipe is filled with the same liquid resin from the opening at one end thereof. As shown in the figure, the pressure difference that is generated in the pipe before and after the resin plug imparts fluidity to the resin plug, and the progress of the process causes the inner surface of the conduit to be lined with the required lining construction. By supplying a pressurized gas of a required pressure to the inside of the supply pipe branched from the conduit to maintain the internal pressure in the supply pipe relative to the internal pressure in the conduit at a required differential pressure, the gas penetrates into the supply pipe from the inside of the conduit. When the pressure inside the pipe decreases due to blow-through of the resin plug in the conduit while the amount of oil is made constant, the inflowing resin is discharged to the inside of the conduit due to the above-mentioned differential pressure. In finishing lining construction,
The introduction of the pressurized gas into the supply pipe is stopped, and the resin entering the supply pipe due to the progress of the finishing resin plug in the pipe is moved toward the terminal opening of the supply pipe by the pressurized gas provided in the conduit passage. The feature is that it is constructed so as to be discharged.

[Action]

In such a repairing method, the amount of resin that enters the supply pipe during the lining of the conduit becomes constant, and when the lining of the conduit is completed, a certain amount of the invading resin is returned to the conduit to finish the lining. In the previous stage, the amount of residual resin in the conduit becomes constant. As a result, the volume of the resin plug flowing in the pipe is stabilized during the finishing lining construction, and the resin flow rate can be appropriately maintained by computer control or the like, and construction with a uniform lining film thickness is achieved. In addition, since the resin corresponding to a certain amount of residual resin enters the supply pipe during the finishing lining of the conduit, the pressurized gas applied in the conduit moves the invading resin toward the end opening of the supply pipe. When the discharge process is performed, the process becomes stable.

【Example】

An embodiment of the present invention will be specifically described below with reference to the drawings. In the figure, reference numeral 1 is a resin supply device used in the repairing method of the present invention, and 2 is an additive used when the lining resin supplied to the repaired part of the existing pipe by the resin supply device 1 is made to flow with a pressurized gas. It is a pressurized gas supply device. The resin supply device 1 includes a resin injector 3, a supply pipe 4 that communicates with the bottom of the resin injector 3, and a launcher 6 that communicates with the supply pipe 4 via an electromagnetic on-off valve 5. When the electromagnetic on-off valve 5 is open, the lining resin in the resin injector 3 is supplied and filled in the launcher 6, and the resin plug E is formed in the launcher 6. The resin injector 3 is provided with a plunger 3a,
Pressurized gas is supplied to the top portion by means such as that described later so that the resin can be extruded. The lining resin with which the launcher 6 is filled is, for example, a room temperature two-liquid curing type resin prepared by mixing a main agent and a curing agent,
Of these, the main component is a composition containing unsaturated polyester resin, vinyl ester resin, epoxy resin, urethane resin, etc. as a main component, and a pigment, a thixotropic agent, etc. are added to this to have thixotropy (for example, 250,000). ~ 300,000cp
TI value is 6 with s. On the other hand, the pressurized gas supply device 2 includes a compressor 7, an air tank 8, flow rate adjusting valves 9 and 10, and a gas supply pipe 11 connected to the end of the launcher 6 to which an electromagnetic on-off valve 12 is attached. Flowmeters 13 and 14 and pressure gauges 15 and 16 are provided corresponding to the adjusting valves 9 and 10. If necessary, the three-way switching valve 1
7 is provided on the outlet side of the compressor 7 so that the pressurized gas can be branched to the conduit 18, and is communicated with the top of the resin injector 3 via the conduit 18 and the flow rate adjusting valve 19. ing. The output information from the flowmeters 13 and 14 and the pressure gauges 15 and 16 is received, and calculation is performed according to the required program,
A control unit 20 for adjusting and controlling 9, 10 is provided in the pressurized gas supply device 2. In the control unit 20, the amount of resin filled in the launcher 6 is calculated from the opening degree of the flow rate adjusting valve 19 and the opening time of the electromagnetic opening / closing valve 5 and stored in the memory, and the opening time of the electromagnetic opening / closing valve 5 is calculated. The resin flow velocity V for achieving the resin lining with a predetermined film thickness is calculated from the output information of the flowmeters 13 and 14 and the pressure gauges 15 and 16 of each moment, and the flow rate is maintained so as to maintain the velocity. It functions to control the opening of the adjusting valves 9 and 10. On the other hand, the existing pipes to be repaired with the lining in the present invention are the conduit line A (branch pipe or main pipe) buried underground under the road and the supply pipe B branched from this conduit line A and drawn into the demand destination. The supply pipe B has one end protruding to the ground and is connected to meters. Then, the lining repair is first performed on the supply pipe B and then on the conduit A, and prior to that, preparations for the following repairs are made. That is, the conduit A is divided into repair sections of a predetermined length and both ends thereof are opened. Therefore, vertical shafts C and D as shown in FIG. 2 are formed at corresponding locations, and the end of the conduit A is cut there. Open by. Further, as for the supply pipe B communicating with the conduit A, the meters are removed and the ground end is opened. Then, pressurized air is passed through the conduit A and the supply pipe B to remove dust inside. Then, first, the launcher 6 is connected to the open end of the supply pipe B, the electromagnetic on-off valve 5 is opened, and the lining resin is supplied from the resin injector 3 into the launcher 6 with pressurized gas to fill the resin plug. Form. Then, the electromagnetic on-off valve 5 is closed, and the pressurized gas whose pressure is adjusted by opening the electromagnetic on-off valve 12 is supplied to the resin plug through the launcher 6, and is made to flow to the supply pipe B, A lining film having a predetermined thickness is formed on the inner surface of the pipe. At this time, in the control unit 20, the opening degree of the resin flow rate adjusting valves 9 and 10 is adjusted. In this case, the calculation basis of the control unit 20 depends on the following formula. First, assuming that the amount Q ₁ of pressurized gas flowing into the supply pipe B and the pressure P ₁ (for example, 0.6 kg / cm ² ) are π / 4 · D ² · l ₁ · P ₁ = Q ₁ · P ₀ ... Because of the relationship of (1), if Q ₁ , P ₀ , and P ₁ are measured at time T _{1 when} the feeding of the resin plug by the pressurized gas is started, then l ₁ can be known from the equation (1). Here, the amount Q _{1 of} the gas flowing into the supply pipe B is obtained by the difference between the measured values F ₁ and F ₂ of the flowmeters 13 and 14. In this case, if a mass flowmeter is used for the flowmeters 13 and 14, there is no influence of the temperature of the gas, and therefore the calculation is easy. Also here, l ₁ is the position of the resin plug at time T ₁ ,
P ₀ and P ₁ are measured values of the pressure gauges 15 and 16, and D is the inner diameter of the lining of the supply pipe B. Similarly, if the position of the resin plug obtained by measuring and calculating the pressure P ₂ and the inflow amount Q ₂ at time T ₂ is l ₂ , the flow velocity V of the resin plug is V = Δl / Δt Become. However, Δl = l ₂ −l ₁ and Δt = T ₂ −T ₁ . Therefore, the predetermined time interval Δt is set to the control unit 20.
Set with the clock of the internal oscillator, and each time, the flowmeter 13,1
The amount of inflowing gas flowing into the pipe from 4 and the respective pressures from the pressure gauges 15 and 16 are measured, and the flow rate adjusting valves 9 and 10 are set so that the instantaneous resin flow velocity V is maintained at a constant value. Control it. In the supply pipe B, the length of the resin plug is reduced because it is consumed for lining the inner surface of the pipe, but the control unit 20 calculates the amount of resin consumed over time, and in response to this. Since the pressure of the pressing gas drops substantially linearly (see FIG. 4), the flow velocity of the resin plug can be maintained at a constant value. If the resin of the resin plug is consumed before the resin lining on the inner surface of the supply pipe B is completed over the entire length of the pipe, the pressurized gas pressing the resin plug at that time blows through the supply pipe B, and It will drop to atmospheric pressure on Road A. Since such a change in pressure occurs rapidly, it is checked on the control unit 20 side and it is judged that the end of the resin lining this time is completed, and the inflow amount Q of the gas supplied to the supply pipe B until this time is judged. The length l to the position where the resin lining ends, the elapsed time t _0, etc. are stored in the memory,
Close the solenoid on-off valve 12. Next, in the control unit 20, the electromagnetic on-off valve 5 and the flow rate adjusting valve 19 are opened, and the lining resin is supplied and filled from the resin injector 3 into the launcher 6 to form a predetermined amount of resin plug in the launcher 6. Then, close the solenoid on-off valve 5 and the flow rate adjusting valve 19 to
12 is opened, and the resin plug E is moved to the speed V again as described above.
The supply pipe B is lined while controlling the temperature. At this time, as long as the speed V is maintained, the length of the resin plug, in other words, the amount of resin, does not change while the lining resin plug E passes through the area where the lining resin has been lined last time. The controlled pressure of the pressure gas is also maintained at a substantially constant value. However, after the resin plug E reaches the position where the supply pipe B is not yet lined, the resin is consumed by the lining as described above, the length of the resin plug E is reduced, and therefore the pressure of the pressing gas is also gradually reduced. While the lining is progressing.
Then, the resin plug length becomes approximately 0, and the elapsed time until the pressure gas blows through and falls to the atmospheric pressure becomes approximately 2t ₀ ,
The length to the end of the lining is also about 2l. In this way, the lining length is sequentially extended by repeating the lining by filling the resin and pressing the resin plug with the pressurized gas. When the lining of the supply pipe B is completed and the length of the resin plug still remains and reaches the connection portion (branch point) with the conduit A, the resin plug E flows into the conduit A and the resin plug E The pressurized gas that has been pressing against blows into the conduit A. For this reason, the measurement value of the pressure gauge 16 drops sharply to almost atmospheric pressure. This is judged by the control unit 20. This is shorter than the expected elapsed time (n × t) (where n is the number of times the resin is filled and t is the time length until one lining of the resin plug is completed) (n−1) t + t ′ (however, t ′ <T)
Then, it is judged whether or not the rapid pressure drop as described above is brought about. That is, it is determined that the resin plug has reached the inside of the conduit A from the sudden decrease in the pressing force and the difference between the actual elapsed time and the predicted elapsed time, and the lining repair for the corresponding supply pipe B is completed. . If t'≈t, there is a problem of measurement error.
Further, it is advisable to fill the resin once and measure the time until reaching the conduit A. This error range may be set in advance by the control unit 20. That is, the control unit 20 issues a command to refill the resin if it is within the error range, and outputs a termination command if it is not within the error range. When the inside of the conduit line A is lined later, if the amount of resin left in the conduit line A is unknown, the resin plug length in the lining process of the conduit line A changes, so the conduit line A
Either the residual resin inside is removed prior to the lining of the conduit A, or this residual resin is removed from the control unit 20.
When the resin plug reaches the branch point (connection point with the supply pipe B in the conduit line A) at the time of lining the conduit line A, the resin plug with the residual resin amount added The control unit 20 may calculate so as to correct the length. In this way, the resin lining for the supply pipe B is sequentially performed, and then, as shown in FIG. 5, a receiver 21 composed of a transparent pipe or the like is connected to the open end of the supply pipe B.
A cylinder 23 of compressed gas such as compressed air is connected to the receiver 21 via a flow rate adjusting valve 22, and the receiver
A throttle valve 24 is connected to a branch portion 21a of 21 and a pressure gauge 25 and a flowmeter 26 are provided. In this state, for conduit A,
As shown in Fig. 6, connect the launchers 6 that match the dimensions,
As in the case of the supply pipe B, the resin lining on the inner surface of the pipe is realized. At this time, in the supply pipe B, a flow rate adjusting valve
Pressurized gas is supplied from the cylinder 23 via 22 and the throttle valve 24 is closed. Then, for example, in the conduit A, the pressure of the pressurized gas that presses the resin plug E is 1.5 kg /
If the pressure is cm ² , a slightly lower pressure, for example, 1.3 kg / cm ² is held in the supply pipe B. In this case, the pressurized gas that presses the resin plug E in the conduit A is gradually lowered when the resin is consumed for the lining and the resin plug length becomes short as described above. The flow rate adjusting valve 22 may be adjusted by the control unit 20 so that the pressure difference is maintained at, for example, −0.2 kg / cm ² . As a result, as shown in FIG. 7, when the resin plug E reaches the connection point between the conduit line A and the supply pipe B in the lining process of the conduit line A, the resin amount (predetermined amount) corresponding to the pressure difference is obtained. Enters the supply pipe B. At this time, the pressurized gas in the supply pipe B is compressed by the invading resin E'and the pressure rises (corresponding to the pressurized gas pressure for pressing on the conduit A side).
Detected by the control unit 20 and analyzed, and a command is issued to close the flow rate adjusting valve 22. For this reason, the resin is consumed due to the lining in the conduit A, and the invading resin is retained in the supply pipe B until the pressurized resin is blown out due to the loss of the resin plug (see FIG. 8). As the pressure in the conduit A drops to atmospheric pressure when blown through, the invading resin is discharged into the conduit A at the gas pressure on the supply pipe B side and left (see FIG. 9). In the control unit 20, the amount of resin that has entered the supply pipe B is calculated from the gas pressure difference at that time, the inner diameter of the supply pipe B, etc., and the resin plug after passing through the connection point (branch part) with the supply pipe B is calculated. Correcting the length, speed V of the resin plug
Hold constant. When the invading resin is discharged into the conduit A from the supply pipe B, the control unit 20 detects this by a decrease in the indicated pressure of the pressure gauge 25, opens the flow rate adjusting valve 22 again, and pressurizes the gas from the cylinder 23. Is supplied into the supply pipe B at a required pressure. Therefore, when the next conduit plug A is filled with the next resin plug and passes through the connection point with the corresponding supply pipe B, the same amount of resin invades into the supply pipe B again. The length of the resin plug in the conduit A does not change in the process of being sent by pressurized gas. In this way, the filling of the resin into the conduit A, the pressing with the pressurized gas, and the lining are repeatedly executed, and finally the lining resin plug is discharged to the receiver 27 provided at the other end of the conduit A. Continue lining work until
When the lining resin plug reaches the receiver 27, the resin is received by the receiver tank 28, and the pressurized gas blows through and drops to the atmospheric pressure. Therefore, the control unit 20 finishes the lining work of the conduit A. To detect. Finally, when the required amount of the resin plug is supplied and filled in the conduit A and the resin plug is pressed by the pressurized gas, the resin finally intrudes into the supply pipe B in the same amount as described above. At this time, the control unit 20 detects the resin invasion into the supply pipe B with the pressure gauge 25, closes the flow rate adjusting valve 22, and then a predetermined time has passed, that is, the resin plug E is in the conduit A. After passing through the connection point with the supply pipe B, the throttle valve 24 is controlled to open at a predetermined opening. As a result, the pressurized gas on the open end side of the supply pipe B is gradually released into the atmosphere through the throttle valve 24, and the invading resin is pushed by the pressurized gas in the conduit line A and is supplied to the supply pipe B. Inside, it is consumed as a lining layer in this process, or is pressed as it is and reaches the receiver 21. In the process,
The flow meter 26 measures the discharge amount of the pressurized gas, and the control unit 20 corrects the inflow amount of the pressurized gas supplied to the conduit A side in consideration of the discharge amount. When the invading resin reaches the receiver 21 or the pressurized gas on the side of the conduit A blows into the receiver 21 (when the invading resin is consumed as a lining layer), the throttle valve 24
Close. In this way, after the resin entering the supply pipe B communicating with the conduit line A is cleaned up, the resin plug passing through the conduit line A is discharged to the receiver 27, whereby the finishing lining is completed. (See Figure 10). In the above embodiment, when finishing lining the conduit A, a relief valve 29 is provided at the open end of the supply pipe B as shown in FIG. 11 so that the resin plug E passes through the connection point with the conduit A. The resin that has entered at the time of moving may be moved in the supply pipe B at a required speed by the pressurized gas applied to the side of the conduit A and the degree of restriction of the relief valve 29 to be sent to the receiver 21. Further, instead of the relief valve 29, the receiver 21 may be configured by a tubular body, and a small hole for throttling may be formed at the end so that the same function as that of the relief valve 29 can be achieved. [Effect of the Invention] According to the present invention, as described in detail above, the amount of resin that enters the supply pipe during the lining of the conduit is made constant, and when the lining of the conduit is completed, a certain amount of the invading resin Is returned to the conduit, so that the amount of residual resin in the conduit becomes constant before the finishing lining. As a result, the volume of the resin plug flowing in the pipe is stabilized during the finishing lining, and the resin flowing speed can be appropriately maintained by computer control or the like, and the uniform lining thickness can be achieved. In addition, since a resin corresponding to a certain amount of residual resin enters the supply pipe during the finishing lining of the conduit, the pressurized gas applied in the conduit moves the invading resin toward the end opening of the supply pipe. When processing is performed so as to be discharged, effects such as that the processing is performed stably can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention, FIG. 2 is an explanatory diagram showing a condition of an existing pipe to be repaired, FIG. 3 is an explanatory diagram showing a resin lining condition of a supply pipe, and FIG. Is a time chart showing the repeated state of the resin lining, and FIG. 5 is an explanatory view showing means for preventing invading resin at the open end of the supply pipe.
FIG. 6 is an explanatory view showing a resin lining condition of the conduit, FIG. 7 is an explanatory view showing a condition when the resin plug reaches a branching part to the supply pipe in the conduit, and FIG. 8 is the branching part. FIG. 9 is an explanatory view showing a situation after the resin plug has passed through, FIG. 9 is an explanatory view showing a situation when the pressurized gas in the conduit is blown through,
FIG. 10 is an explanatory view showing the situation at the time of finishing lining, 11th
The figure is an explanatory view showing another example of the resin countermeasure means that has entered the supply pipe at the stage of finishing lining. 1 ... Resin supply device, 2 ... Pressurized gas supply device, 5 ...
Electromagnetic on-off valve, 6 ... Launcher, 7 ... Compressor, 8
...... Air tank, 9,10 ...... Flow control valve, 12 ...... Electromagnetic on-off valve, 13,14 ...... Flow meter, 15,16 ...... Pressure gauge, 19 ...... Flow control valve, 20 ...... Control unit, 21 ...... Receiver,
22 …… Flow control valve, 23 …… Cylinder, 24 …… Throttle valve, 25…
… Pressure gauge, 26 …… Flowmeter, 29 …… Relief valve.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Masato Shinozaki Four stock companies, 3-18, Daiko City, Kanagawa Prefecture

Claims (1)

[Claims] 1. A repair target is a conduit line laid under a road or the like, and a supply pipe branched from the conduit line and drawn into a customer, first of all, from the end opening portion of the supply pipe. After introducing the liquid resin in a plug shape so as to fill the inside of the pipe, a pressure difference is generated in the pipe before and after the resin plug to cause the resin plug to flow toward the conduit passage side, and the inner surface of the supply pipe is lined by the progress thereof. The supply pipe lining is applied, and then, a liquid resin is introduced into the pipe from the one end opening portion in a plug shape so as to fill the pipe, and the resin is caused by the pressure difference generated before and after the resin plug. When the plug is provided with fluidity and is advanced to perform the required lining construction on the inner surface of the conduit, a pressurized gas of the required pressure is applied to the inside of the supply pipe branched from the conduit in the construction section. Internal pressure in conduit With a certain the amount of resin penetrating into the branch portion of the supply pipe from the conduit path by maintaining the required pressure difference the pressure in the supply pipe against,
When the pressure inside the pipe decreases due to blow-through of the resin plug in the conduit, the invading resin is discharged into the conduit due to the above-mentioned differential pressure, and in the finishing lining construction for the subsequent conduit,
The introduction of the pressurized gas into the supply pipe is stopped, and the resin entering the supply pipe due to the progress of the finishing resin plug in the pipe is moved toward the terminal opening of the supply pipe by the pressurized gas provided in the conduit passage. A lining repair method for the inner surface of the pipe, which is characterized in that it is constructed so as to be discharged.