JP2700326B2 - Repair method for lining of pipe inner surface - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial applications]

The present invention relates to existing pipes such as gas pipes and water pipes laid underground, and in particular, to existing pipes referred to as main pipes or branch pipes, on the inner surface of the pipes, uniform resin lining as laid. It relates to a lining repair method for the inner surface of a pipe to be applied.

[Prior art]

Generally, existing pipes laid underground, such as gas pipes and water pipes, are likely to leak due to corrosion holes and loosened joints due to aging. Therefore, at a required time after the construction, the existing pipe is repaired by resin lining on the inner surface of the pipe in the laid state. Therefore, as described in JP-A-63-65983, a liquid resin is filled into a pipe at one end of an existing pipe in a plug shape, and the resin group is moved by a required pressurized gas, and the inner surface of the pipe is moved. A lining repair method for the inner surface of the pipe to provide the required lining thickness was proposed. Here, a launcher is connected to one end of an existing pipe that has been opened, and a resin tank is filled with a resin for lining from a resin tank connected to the launcher to form a resin group in the launcher. The supplied pressurized gas is supplied into the existing piping. Then, the resin group flows under the pressure of the pressurized gas in the existing pipe, and when the resin is consumed by the lining of the pipe inner surface, the resin is again filled into the launcher from the resin tank to form the resin group in the launcher. Then, the pressurized gas is supplied again into the existing pipe.
By repeating such operations, the inner surface of the existing pipe is repaired for a predetermined length.

[Problems to be solved by the invention]

The problem here is that there is a substantial limit on the amount of resin group that can be filled into the existing piping at one time. This is determined by the viscosity of the resin used for the lining, the thixotropy, the thickness of the lining, and the limit of the pressure value of the pressurized gas. In addition, the resin group brought into the existing pipe by the next filling must maintain the same resin speed as that at the time of lining, while sending it to the position where the line pressure is finished. Therefore, the time required for the first resin lining is t ₁
However, the next time t ₁ + t ₁ = 2t ₁ , the third time t ₁ + t ₁ + t ₁ = 3
Since the required time is increased by an arithmetic progression every time the number of times of filling is increased as in t ₁ ..., the time T required to complete the lining of the required repair section is T = (n ² + n) ) is a / 2 · t _1. (However, n is the number of times the lining resin is filled during this period) The present invention has been made based on the above circumstances, and the resin group moves in a scheduled repair section, and the resin is consumed for lining. By filling the resin group with the resin in the process, the pressing movement of the resin group by the pressurized gas is continued, so that the lining repair method for the inner surface of the pipe which can greatly reduce the working time required for the lining is described. It is something to offer.

[Means for Solving the Problems]

For this reason, in the present invention, in the process of filling the tube with a plug-shaped liquid resin group and supplying the required pressurized gas from one side of the resin group to move the resin group, a lining with a film thickness is formed on the inner surface of the tube. In the lining repair method on the inner surface of the pipe, the filling of the resin group and the supply of pressurized gas are performed from one end opening of the existing pipe to be lined, and the resin is consumed during the movement of the resin group with respect to the lining. In response to the above, while the resin is filled from the branch pipe branched from the existing pipe, the pressing movement of the resin group by the pressurized gas is continued.

[Action]

Therefore, when the existing pipe is filled with the first resin group from one end opening and then the resin group starts to be pressed and moved by the pressurized gas, the resin is replenished in the process, and the resin group is consumed and added. The time and the distance until the pressurized gas blows through the existing pipe can be greatly extended, and the resin group can be filled again from one end opening, and the waste time required for feeding the resin group again by the pressurized gas can be greatly reduced. The most effective method is to replenish the resin group from the branch pipe in a convenient manner, thereby lining one repair section at a stretch. In this way, the lining operation time can be significantly reduced. Further, the loss due to blow-through of the pressurized gas can be reduced or avoided.

【Example】

Hereinafter, an embodiment of the present invention will be specifically described with reference to the drawings. In the figure, reference numeral 1 denotes a resin supply device used in the repair method of the present invention, and 2 denotes a lining resin supplied to a repair portion of an existing pipe by the resin supply device 1 using a pressurized gas (for example, pressurized air). It is a pressurized gas supply device used when flowing. The resin supply device 1 includes a resin injector 3, a supply pipe 4 communicating with the bottom of the resin injector 3, and a launcher 6 communicating 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 to and charged into the launcher 6 to form a resin group E in the launcher 6. The resin injector 3 is provided with a plunger 3a,
Further, a pressurized gas is supplied to the top by means described later so that the resin can be extruded. The lining resin to be filled in the launcher 6 is, for example, a room-temperature two-component curing resin prepared by mixing a main component and a curing agent, and the main component is an unsaturated polyester resin, vinyl ester resin, epoxy resin, urethane resin, or the like. And a thixotropy (eg, 250,000 to 3
The TI value is 6) at 00,000 cps. On the other hand, the pressurized gas supply device 2 includes a compressor 7,
An electromagnetic on-off valve 12 is attached to an air tank 8, flow control valves 9, 10 and a gas supply pipe 11 connected to the end of the launcher 6, and flow meters 13, 14 correspond to the respective flow control valves 9, 10. And pressure gauges 15 and 16. If necessary, a three-way switching valve 17 is provided on the outlet side of the compressor 7 so that the pressurized gas can be branched to the pipe 18. It communicates with the top of the injector 3. The control unit 20, which receives output information from the flow meters 13 and 14 and the pressure gauges 15 and 16 and performs calculations in accordance with a required program and adjusts and controls the flow rate regulating valves 9 and 10, is provided by the pressurized gas supply device. 2. In the control unit 20, the amount of resin charged into the launcher 6 is calculated from the opening degree adjustment of the flow control valve 19 and the opening time of the electromagnetic on-off valve 5, stored in a memory, and the opening time of the electromagnetic on-off valve 5, Subsequent momentary flow meters 13, 14
From the output information of the pressure gauges 15 and 16, a resin flow rate V for achieving resin lining with a predetermined film thickness is calculated, and the opening of the flow control valves 9 and 10 is controlled so as to maintain the resin flow rate V. Work. On the other hand, the existing piping to be repaired in the lining in the present invention is a branch pipe A (or main pipe) buried underground and a service pipe B whose one end is protruded above the ground and connected to meters, and the service pipe B is It branches off from the branch pipe A. The lining repair is first performed on the inner pipe B and then on the branch pipe A. Prior to this, the following preparations are made for repair. That is, the branch pipe A is divided into repair sections of a predetermined length,
In order to open both ends, shafts C and D as shown in FIG. 2 are formed at corresponding locations, and the ends of the branch pipe A are opened by cutting. Further, the service pipe B communicating with the branch pipe A
For, remove the meters and open the ground end. Then, pressurized air is passed through the branch pipe A and the service pipe B to remove dust inside. Then, first, the launcher 6 is connected to the open end of the service pipe B, the electromagnetic on-off valve 5 is opened, and the lining resin is supplied and filled into the launcher 6 with the pressurized gas from the resin injector 3. Form a team. When the electromagnetic on-off valve 5 is closed and the electromagnetic on-off valve 12 is opened, the regulated pressurized gas is supplied to the launcher 6.
The resin is supplied to the resin group through the above, and is made to flow and sent to the inside pipe B to form a lining film having a predetermined thickness on the inner surface of the pipe. At this time, in the control unit 20, the opening degree of the resin flow control valves 9, 10 is adjusted. In this case, the calculation basis of the control unit 20 depends on the following formula. First, the amount Q ₁ of the pressurized gas flowing into the service pipe B and the pressure P
_{If 1} (for example, 0.6 kg / cm ² ), the relationship of π / 4 · D ² · l ₁ · P ₁ = Q ₁ · P ₀ ... (1) If Q ₁ , P ₀ , and P ₁ at the start time T ₁ are measured, l _{1 is obtained} from the equation (1).
You can know. Here, obtained by difference between the measured values F ₁ and F ₂ of the flow meter 13, 14 of the amount to Q ₁ gas that has flowed into the service pipes B. In this case, by using the mass flowmeter to the flowmeter 13 and 14, since there is no influence of the temperature of the gas, operation is easy, also, where l ₁ is the position of the resin group at time T _1,
P ₀ and P ₁ are the measured values of the pressure gauges 15 and 16, and D is the lining inner diameter of the service pipe B. Similarly, if the pressure P ₂ and the inflow amount Q ₂ at the time T ₂ are measured, and the position of the resin group obtained by calculation is l ₂ ,
The flow velocity V of the resin group is V = Δl / Δt. However, Δl = l ₂ −l ₁ and Δt = T ₂ −T ₁ . Therefore, the predetermined time interval Δt is set by the clock of the oscillator in the control unit 20, and each time, the flow meter is set.
The amount of gas flowing into the pipe from 13,14
The respective pressures are measured from 5, 16 and the flow rate adjusting valves 9 and 9 are controlled so that the instantaneous resin flow velocity V is maintained at a predetermined value.
It controls ten. In the supply pipe B, the length of the resin group is reduced because it is consumed for lining to the inner surface of the pipe, but the control unit 20 calculates the amount of resin consumed as time passes. As a result, the pressure of the pressurized gas drops substantially linearly (see FIG. 4), so that the flow velocity of the resin group can be maintained at a constant value. If the resin of the resin group is consumed before the resin lining on the inner surface of the service tube B is completed over the entire length of the tube, the pressurized gas that has pressed the resin group at that time blows through the service tube B. Then, the pressure drops to the atmospheric pressure of the branch pipe A.
Since such a change in pressure occurs sharply, the control unit 20 checks the pressure and determines that the current resin lining has been completed, and determines the flow rate of the gas supplied to the service pipe B up to this time. Q, the length l to the position where the resin lining has been completed, and the elapsed time t ₀ is stored in the memory, closes the electromagnetic on-off valve 12. Next, the control unit 20
Then, open the solenoid on-off valve 5 and the flow control valve 19 and open the resin injector 3
Then, a lining resin is supplied and filled into the launcher 6 to form a predetermined amount of resin group in the launcher 6. Then, the electromagnetic on-off valve 5 and the flow control valve 19 are closed, the electromagnetic on-off valve 12 is opened, and the internal pipe B is lined while controlling the resin group E to the speed V again as described above. At this time, while the lining resin group E passes through the previously lined area, the length of the resin group, in other words, the amount of resin does not change as long as the speed V is maintained. The pressure of the controlled pressurized gas is also maintained at a substantially constant value. Then, Resin Team E
After reaching the position where the inner pipe B has not yet been lined, the resin is consumed by the lining in the same manner as described above, and the length of the resin group E decreases. Therefore, the pressure of the pressurized gas gradually decreases. Lining proceeds. Then, it becomes substantially the resin chief 0, elapsed time substantially 2t ₀ next to blows pressing gas drops to the atmospheric pressure also,
The length up to the lining end position is also approximately 2 l. In this way, the filling of the resin and the pressing of the resin group by the pressurized gas successively extend the lining length while repeating the lining. When the lining of the service pipe B is completed and the resin group reaches the connection portion (branch point) with the branch pipe A while the length of the resin group still remains, the resin group E flows into the branch pipe A, and the resin group E is removed. The pressurized gas that has been pressed blows into the branch pipe A. For this reason,
The measured value of the pressure gauge 16 drops rapidly, and becomes almost atmospheric pressure.
This is determined by the control unit 20. This is (n-1) t + t '(where t is shorter than the expected elapsed time (n × t) (where n is the number of times of filling of the resin, and t is the length of time required to complete the lining of one resin group). '<T), it is determined whether or not the above-mentioned rapid pressure drop has occurred. That is, it is determined that the resin group has reached the inside of the branch pipe 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. . In the case of t '≒ t, there is a problem of a measurement error. Therefore, it is preferable to further fill the resin for one time and measure the time until the resin reaches the branch pipe A. This error range may be set in advance by the control unit 20. That is, the control unit 20 instructs a refilling of the resin if the error is within the error range, and outputs a termination command if the error is within the error range. In the control unit 20, the amount of residual resin discharged from the service pipe B into the branch pipe A and the time until that time are stored in a memory.
At the time of lining, when the resin group arrives at the branch point (the connection point with the service pipe B in the branch pipe A), an operation for correcting the length of the resin group to the amount of the remaining resin is performed. After the resin lining of the service pipe B is sequentially performed in this way, a cartridge type filling cylinder 21 is connected to the open end of the service pipe B as shown in FIG. A cylinder 23 of a pressurized gas such as compressed air via a valve 22
Connect. The filling cylinder 21 is previously filled with a predetermined amount of a lining resin group, and when the flow control valve 22 is opened, the resin is put into the service pipe B with a pressure of a pressurized gas corresponding to the opening degree. A group is sent. Above flow control valve 22
A mass flow meter 24 and a pressure gauge 25 are provided between the filling cylinder 21 and the filling cylinder 21, and a throttle valve 26 communicating with the atmosphere is provided. Information can be given to the control unit 20. Further, the control unit 20 outputs a control signal for opening and closing the opening and closing of the flow control valve 22 and the throttle valve 26. In the control unit 20, the distance from the one end opening of the branch pipe A to the branch point to each of the service pipes B is stored in a memory in advance. In this state, as shown in FIG. 6, a launcher 6 having the same dimensions is connected to one end opening of the branch pipe A, and the resin lining of the inner surface of the pipe is realized in the same manner as in the case of the internal pipe B. is there. And the first resin group E from launcher 6
Into the branch pipe A by pressurized gas, and in the process,
The branch pipe A is lined with a lining film thickness corresponding to the moving speed V of the resin group E. In this case, the amount of resin consumed is
Since the control unit 20 obtains the time t, the distance l, the gas inflow amount Q, the pressure P, and the like, the constant lining film thickness, in other words, the constant moving speed V is determined by the above-described internal pipe B. Is controlled as in the case of On the other hand, in the control unit 20, before the resin group reaches the corresponding branch pipe B to the branch point (because the resin supply time in each branch pipe B is stored in advance, the control unit 20 The timing can be set in advance on the side), and the flow regulating valve 22 is controlled to replenish the lining resin group from the filling cylinder 21 into the branch pipe A. As the process proceeds, the replenishment amount is added to the amount of resin remaining in the branch pipe A during the lining of the service pipe B first, and is stored in the memory of the control unit 20. And the above resin group is the above-mentioned residual resin (including replenishment part) at a branch point.
At the time of joining, the resin unit length E at that time is corrected by the control unit 20, and the moving speed V of the resin group E is
After that, it is kept constant. Until the resin group E passes through the branch point, the information of the pressure gauge 25 is set so that a gas pressure corresponding to the gas pressure pressing the resin group E on the branch pipe A side is applied to the service pipe B. The control unit 20 controls the flow control valve 22 based on the above. When the internal pressure of the service pipe B is equivalent to the pressure of the pressurized gas in the service pipe A, the resin does not enter the service pipe B, but for example, -0.2 kg / cm ^2. When the internal pressure of the internal pipe B is set so as to be lower than the pressure of the pressurized gas by a certain pressure difference, as shown in FIG. When the resin group E reaches the connection point, the amount of resin (predetermined amount) corresponding to the pressure difference enters the service pipe B. At this time, the pressurized gas in the service pipe B is compressed by the intruding resin E ', and the pressure rises (corresponding to the pressurized gas pressure for pressing the branch pipe A side). Then, the control unit 20 performs an analysis, issues a command, and closes the flow rate adjustment valve 22. For this reason, the resin is consumed for the lining in the branch pipe A, and the penetrating resin is held in the service pipe B until the resin group disappears and the pressurized gas blows through (No. 8).
When the blow-through, the internal pressure in the branch pipe A drops to the atmospheric pressure when the blow-through occurs, and the intruding resin enters the branch pipe A into the branch pipe B.
It is discharged at the gas pressure on the side and left (see FIG. 9). In this way, when the resin group is pressed and moved with the pressurized gas while the resin is replenished in the branch pipe A via the service pipe B, and the lining is continued, the blow-through of the pressurized gas may occur, for example, in the entire repair section. And the resin lining in the branch A is achieved in the shortest time. If the resin group is completely consumed in the repair section and a blow-through of the pressurized gas occurs, the intruding resin in the service pipe B corresponding to the branch point that has passed so far is the branch pipe A.
Since the pressure on the side becomes the atmospheric pressure, it is discharged into the branch pipe A at the internal pressure of the service pipe B. In this case, when the intruding resin is discharged from the service pipe B into the branch pipe A, the control unit 20
This is detected by a decrease in the support pressure of the pressure gauge 25, and the flow control valve 22 is opened again to supply the pressurized gas from the cylinder 23 into the service pipe B at a required pressure. For this reason, when the branch pipe A is filled with the next resin and passes through the connection point with the corresponding service pipe B,
Since the same amount of resin enters the service pipe B again, in the process in which the resin group is sent to the lining unfinished area by the pressurized gas,
The length of the resin group in the branch pipe A does not change. In this manner, the filling of the resin into the branch pipe A, the pressing with the pressurized gas, and the lining are performed once or repeatedly several times, and the receiver provided at the other end of the branch pipe A is finally provided.
At 27, the lining work is continued until the lining resin group is discharged. Then, when the lining resin group reaches the receiver 27, the resin is received by the receiver tank 28,
The pressurized gas blows through and drops to atmospheric pressure, so the control unit 20 detects the end of the lining work of the branch pipe A. When the resin has penetrated into the service pipe B at the branching point, the pressure becomes the atmospheric pressure when the pressurized gas finally blows through the branch pipe A, and a certain amount of the residual resin remains in the branch pipe A.
In this case, the control unit 20 detects the intrusion of the resin into the service pipe B by the pressure gauge 25, and closes the flow control valve 22, and when a predetermined time elapses, that is, in the branch pipe A, the resin unit E After passing through the connection point with the corresponding service pipe B,
The throttle valve 26 is controlled to be opened at a predetermined opening. As a result, the pressurized gas on the open end side of the serving pipe B is gradually released to the atmosphere via the throttle valve 26, and
It is pushed by the pressurized gas in the branch pipe A and moves inside the service pipe B, and is consumed as a lining layer in this process, or is pushed as it reaches the filling cylinder 21. At this stage, the throttle valve 26 is closed. In this way, after the penetrating resin in the internal pipe B which is successively connected to the branch pipe A is disposed, the resin group passing through the branch pipe A is discharged to the receiver 27, thereby completing the finish lining. It is. In the above embodiment, the internal pipe B is filled with resin from its outer open end to achieve the resin lining of the internal pipe B first, but at the time of resin lining of the branch pipe A, At the same time, the resin lining of the service pipe B may be performed in parallel with the resin lining of the branch pipe A, for example, by lining with a resin that penetrates the service pipe B. In this case, the distribution of the resin amount from the branch pipe A to the internal pipe B, the securing of the resin feed speed V by the pressurized gas, and the like may be achieved by control in the control unit 20. In this case, a receiver and the above-described throttle valve 26 may be provided at the open end of the internal pipe B. As described above, in the lining process of the branch pipe A, by replenishing the lining resin from the branch pipe such as the internal pipe B,
Since the number of times of refilling the resin group from one end of the branch pipe A can be reduced or eliminated, the working time can be greatly reduced. By the way, when replenishing the resin repeatedly from one end of the branch pipe A, T = (n ² + n) / 2 · t (where t is the time for consuming one resin group for the lining, and n is the time including the first time) In the case where the repair section is continuously lined at a stretch as in the present invention, for example, T = nt (where L is the repair section length, and the lining length of one resin group in the conventional method is defined as T = nt). (L can be calculated as L / l = n, T = nt), which is a very short time.

【The invention's effect】

As described in detail above, the present invention performs resin filling and lining work from one end of an existing pipe, and in the lining process, replenishes resin from a branch pipe of the existing pipe so that long sections, pressurization can be performed. The resin group can be continuously moved by air, and the lining time can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing one embodiment of the present invention, FIG. 2 is an explanatory diagram showing the condition of an existing pipe to be repaired, FIG. 3 is an explanatory diagram showing the resin lining condition of a service pipe, and FIG. FIG. 5 is a time chart showing the repetition state of the resin lining, FIG. 5 is an explanatory view showing the means for preventing intruded resin at the open end of the service pipe,
FIG. 6 is an explanatory view showing the situation of resin lining of a branch pipe, and FIG.
FIG. 8 is an explanatory view showing a situation when the resin group reaches the branch to the service pipe in the branch pipe, FIG. 8 is an explanatory view showing a situation after the resin group has passed through the branch, FIG. FIG. 10 is an explanatory view showing a situation when pressurized gas blows through the branch pipe, and FIG. 10 is an explanatory view showing a situation at the time of finish lining. 1 ... resin supply device, 2 ... pressurized gas supply device, 5 ...
Solenoid 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 ... Filling cylinder, 22
…… Flow regulating valve, 23… Cylinder, 24 …… Flow meter, 25 ……
Pressure gauge, 26 ... Throttle valve, 27 ... Receiver, 28 ... Receiver tank.

Claims (1)

(57) [Claims] 1. A lining having a required thickness on the inner surface of a pipe in a process of filling a pipe with a liquid resin group in a plug form and supplying a required pressurized gas from one side of the resin group to move the resin group. In the lining repair method for the inner surface of the pipe, the filling of the resin group and the supply of pressurized gas from one end opening of the existing pipe to be lined, and the consumption of resin during the movement of the resin group for the lining A method for repairing a lining of a pipe inner surface, characterized in that, while filling a resin from a branch pipe branched from the existing pipe, pressing and moving of the resin group by a pressurized gas is continued.