JP2700331B2 - Control system for pipe lining repair - 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. The present invention relates to a control system for repairing a pipe inner lining.

[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 in a pipe at one end of the existing pipe, and this resin is introduced into the pipe in a plug shape, and the resin is compressed with a required pressurized gas. A lining repair method for the inner surface of the pipe was proposed, in which the lining was moved to the required thickness while moving the group. 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 the lining film thickness changes depending on the moving speed of the resin group in the existing piping.
In order to ensure a uniform lining film thickness, the moving speed of the resin group must be strictly controlled. However, since the moving speed of the resin group depends on the pressure of the pressurized gas for moving the resin group and the supply amount of the pressurized gas, it is necessary to always catch this information and perform feedback control. In particular, in the lining process, the resin is consumed for the lining along with the movement of the resin group, and the correlation between the movement speed and the pressure of the pressurized gas changes,
This correction is necessary. Also, when the resin group moves within the existing pipe, when it passes through the communication point with the branch pipe, a part of the resin enters the branch pipe and the amount of the remaining resin group decreases, This correction is necessary because the correlation between the moving speed of the resin group and the pressure of the pressurized gas changes. The present invention has been made in view of the above circumstances, and has been made to reduce the amount of the resin group supplied into the existing piping, the supply amount of the pressurized gas, the pressure, and the moving speed of the resin group for maintaining the lining film thickness at the set values. An object of the present invention is to provide a control system in pipe inner surface lining repair capable of realizing highly accurate pipe inner surface lining repair by controlling a supply amount of pressurized gas with information such as a corresponding target pressure.

[Means for Solving the Problems]

For this reason, in the present invention, the tube is filled with a liquid resin group in a plug shape, and a required pressurized gas is supplied from one side of the resin group to move the resin group so that a required film thickness is formed on the inner surface of the tube. In the lining repair method for the inner surface of a pipe that performs lining, a resin supply device that supplies a predetermined amount of the resin group to an existing pipe, and a pressurization that supplies a pressurized gas for moving the resin group in the existing pipe Gas supply device, flow rate adjusting means for adjusting the supply amount of the pressurized gas, flow rate measuring means for measuring the flow rate of the pressurized gas via the flow rate adjusting means,
Pressure measuring means for measuring the pressure of the pressurized gas in the existing pipe, and the actual pressure of the pressurized gas corresponding to the actual moving speed of the resin group measured by the pressure measuring means, Comparison operation means for comparing the set pressure with the target pressure of the pressurized gas corresponding to the target moving speed of the resin group, and the differential pressure obtained by the comparison operation means and the pressurized gas obtained by the flow rate measurement means. A supply flow rate setting means for setting a supply amount of the flow rate adjustment means from a total amount of the supply amount, and moving the resin group by controlling the flow rate adjustment means so as not to generate the differential pressure. The speed is maintained at a target value, and the film pressure of the lining film formed on the inner surface of the tube is controlled. Further, a resin group moving amount calculating means for calculating the moving amount of the resin group in the existing pipe from the measured value of the flow rate measuring means and the measured value of the pressure measuring means, and the moving amount of the resin group corresponding to the moving amount of the resin group. Target value correction means for calculating the consumption of the resin group and correcting the target pressure of the pressurized gas so as to maintain the moving speed of the resin group at a target value. Further, when the resin group enters the branch pipe in the process of moving the resin group within the existing pipe, the amount of decrease of the resin group is calculated, and the moving speed of the resin group is maintained at a target value. A target value correcting means for correcting a target pressure of the pressurized gas is provided.

Therefore, the target pressure is calculated from the amount of the resin group supplied into the existing pipe and the moving speed corresponding to the lining film thickness, and is compared with the actual pressure to obtain a differential pressure. As a basis for correcting the supply amount of, feedback control in the pipe inner surface lining can be realized. For this reason, the film thickness of the lining on the inner surface of the pipe can be managed with high accuracy. Also, when the resin is consumed by the lining of the inner surface of the pipe or decreases due to separation and intrusion into the branch pipe, the correlation between the moving speed of the resin group and the target pressure of the pressurized gas is corrected. As a result, there is no possibility that the lining film thickness becomes non-uniform.

【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 pipe inner surface lining repair of the present invention, and 2 denotes a pressurized gas supply device. The pressurized gas supplied from the pressurized gas supply device 2 is used to move the lining resin supplied from the resin supply device 1 into the existing pipe. 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 air tank 8, a gas supply pipe 9, and an electromagnetic on-off valve 11. The gas supply pipe 9 is connected to an end of the launcher 6, and , And is connected to a pipe 12 via an electromagnetic on-off valve 11. The pipe 12 is provided with a flow control means 13 composed of a flow control valve at a place communicating with the air tank 8. The flow control means 13 is located between the flow control means 13 and the electromagnetic on-off valve 11 to measure the pressure. Means 14 and flow rate measuring means 15 are provided. In addition, the pipe 12 is provided with a bypass 12a, which is separately provided with a flow control means 16 composed of a flow control valve, and in connection with this, a pressure measurement means 17 and a flow measurement means 18 are provided. . The compressor 7 constitutes a basic part of the pressurized gas supply device 2 together with the air tank 8, and is connected to a pipe 20 via a three-way switching valve 19. Is connected to the top of the above-mentioned resin injector 3. A control unit 22 is provided which receives output information from the flow rate measuring means 15, 18 and pressure measuring means 14, 17 and performs calculations in accordance with a required program to adjust and control the flow rate adjusting means 13, 16. The control unit 22 is constituted by a microcomputer and includes a central processing unit (hereinafter referred to as a CPU) 22a, a bus line 22b, a ROM 22c, a RAM 22d, an I / O interface 22e, and the like. The amount is calculated, a control signal for operating the flow rate control valve 21 is output, or the flow rate control means 13, 16 is determined based on the relationship with the resin moving speed V for achieving resin lining with a predetermined film thickness. It functions to adjust and control the degree of opening. Such a function of the control unit 22 can be represented by a functional block diagram as shown in FIG. 1 (B). That is, the control unit 22
Key input means 101; moving speed setting means 102 for searching and setting the resin moving speed from a memory map based on the lining film thickness tR, resin viscosity, and inner diameter D of the existing pipe inputted by the key input means 101; A resin filling amount setting means 103 for setting a resin filling amount (expressed as a resin length) into the inside, setting an opening degree of the flow control valve 21 and setting an opening time of the electromagnetic on-off valve 5; Target pressure setting means 104 for setting a target pressure of the pressurized gas corresponding to the resin moving speed previously set, corresponding to the filling amount (resin length), and the measured values measured by the pressure measuring means 14, 17 Pressure calculating means 105 for calculating the actual pressure of the pressurized gas corresponding to the actual moving speed of the resin group E in the existing pipe, and a comparison operation for comparing the target pressure and the actual pressure to obtain a differential pressure. Means 106 and the existing pipes obtained by the flow rate measuring means 15 and 18 A gas supply amount calculating means 107 for calculating the feed rate and the total amount of pressure gas,
From the above differential pressure, gas supply amount, and total amount, flow rate adjusting means 13,1
And a supply flow rate setting means 108 for setting the opening degree of 6. Further, the control unit 22 calculates the amount of movement of the resin group E in the existing pipe by the measurement values of the flow rate measuring means 15 and 18, in other words, the total gas supply amount calculated by the gas supply amount calculation means 107, and the pressure. A resin group movement amount calculating means 109 calculated from the pressure value obtained by the calculating means 105; a lining film thickness tR input by the input key means 101;
And a target value correcting means 110 for calculating the consumption amount of the resin group E from the moving amount of the resin group and correcting the target pressure of the pressurized gas.
Is provided. Further, when the resin group E enters the branch pipe in the process of moving the resin group E in the existing pipe, the control unit 22 controls the resin group E via the target value correcting means 110.
Is configured to correct the target pressure of the pressurized gas in accordance with the decrease amount of the pressure. In this case, the amount of reduction of the resin group E is calculated by the branched resin amount calculation means 111. On the other hand, the existing pipes to be repaired in the lining according to the present invention are a branch pipe A (or main pipe) buried underground and a supply pipe B protruding one end above the ground and connected to meters, and the supply pipe B is the above-mentioned branch pipe. Branched from A. Then, the lining repair is performed first on the supply pipe B and then on the branch pipe A. Prior to this, preparations are made for the following repair. That is, the branch pipe A is divided into a repair section of a predetermined length, and in order to open both ends thereof, standing piles C and D as shown in FIG. Is released by cutting. Further, with regard to the supply pipe B communicating with the branch pipe A, the meters are removed and the ground end is opened. Then, pressurized air is passed through the branch pipe A and the supply pipe B to remove dust inside. First, the launcher 6 is connected to the open end of the supply pipe B, and the setting conditions for the supply pipe B, ie, the lining film thickness tR, resin viscosity,
Input the inside diameter d of the supply pipe B. Thus, the control unit 22 retrieves and sets the moving speed V from the memory map configured based on the characteristic diagram shown in the graph of FIG. 12, for example, by the moving speed setting means 102.
In the resin filling amount setting means 103, the supply pipe B
A single resin filling amount (resin length) is determined based on the diameter of the tube, and based on the determined amount, the opening of the flow control valve 21 and the opening time of the electromagnetic on-off valve 5 are set. The electromagnetic on-off valve 5 is opened at the set opening time, and the flow control valve 21 is opened at the set opening amount. As a result, the lining resin is supplied and filled into the launcher 6 by the pressurized gas from the resin injector 3 to form the resin group E.
Then, the electromagnetic switching valve 5 is closed, and the electromagnetic switching valve 11 is opened. Alternatively, the amount of the charged resin may be measured by a resin flow meter (not shown) attached to the supply pipe 4, and the electromagnetic on-off valve 5 may be closed when a predetermined amount of the resin is charged into the launcher 6. As a result, the pressurized gas (air in this embodiment) in the air tank 8 pressurized by the compressor 7 passes through the flow control means 13 to the pipe 12 and further to the launcher 6.
Spilled out to. In the launcher 6, the supply amount is measured by the flow rate measuring unit 15 and the pressure is measured by the pressure measuring unit 14 in the process of the pressurized gas sending the resin group E to the supply pipe B. The result is given to the control unit 22.
In the control unit 22, the actual pressure PR is calculated by the pressure calculating means 105. On the other hand, in correspondence with the moving speed V set by the moving speed setting means 102, the target pressure setting means 104 sets the target pressure PS of the pressurized gas corresponding to the moving speed. The difference pressure between the actual pressure PR and the actual pressure PR is obtained by the comparison operation means 106. As a result, if PS> PR, the opening is set so as to increase the opening of the flow control means 13, and conversely, if PS <PR, the opening of the flow control means 13 is adjusted to the standard opening corresponding to the moving speed. At the same time, the opening of the flow rate adjusting means 16 is adjusted from 0 to a predetermined value (set according to the magnitude of the differential pressure). In this way, the pressure of the pressurized gas is adjusted to the initial set pressure for sending the resin group E to the supply pipe B. at the same time,
The gas supply amount calculating means 107 integrates the flow rate per unit time measured by the flow rate measuring means 15, calculates the flow rate and the integrated amount by the flow rate measuring means 18 and performs an operation. The volume of the pressurized gas in B is calculated. Finally, the actual pressure is adjusted to the target pressure, and the supply amount of the pressurized gas per unit time via the flow rate adjusting means 13 in that state is adjusted. At this stage, the flow control means 16 is closed. The pressurized gas adjusted in this way sends the resin group E to the supply pipe B via the launcher 6 to form a lining film having a predetermined thickness on the inner surface of the pipe. At this time, in the control unit 22, the pressure measuring means
Feedback control is provided to the flow rate adjusting means 13 and 16 so that the actual pressure converges to the target pressure based on the detection values of the flow rate measuring means 14 and 17 and the flow rate measuring means 15 and 18. In the supply pipe B, the length of the resin group E decreases because it is consumed for lining to the inner surface of the pipe, but the control unit 22 calculates the amount of resin consumed as time passes. That is, in the control unit 22, the resin group moving amount calculating means 109 calculates the resin group moving amount from the total gas supply amount and the pressure value, and determines the moving amount and the set lining film thickness tR and the supply pipe B. The consumption of the resin group E is calculated from the inner diameter d. And the target value correcting means 110
Then, the target pressure of the pressurized gas is corrected (see FIG. 4). As a result, since the flow rate adjusting means 13 and 16 are controlled so that the actual pressure converges to the target pressure, the flow velocity of the resin group E can be maintained at a constant value, and the lining film thickness is kept constant. In the supply pipe B, the length of the resin group is reduced because it is consumed for lining on the inner surface of the pipe, but the control unit 22 calculates the amount of resin consumed according to the passage of time. Since the pressure of the pressurized gas drops substantially linearly (see FIG. 4), 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 supply tube B is completed over the entire length of the tube, the pressurized gas that has pressed the resin group at that point blows through the supply tube B, and the branch tube It drops to the atmospheric pressure of A. Since such a change in pressure occurs rapidly, the control unit 22 checks the pressure, and determines that the lining with the filling resin for this time has been completed, and determines the inflow amount of the gas supplied to the supply pipe B until this time. Q, the length L up to the position where the resin lining is completed, the elapsed time t, and the like are stored in the memory, and the electromagnetic on-off valve 11 is closed. Next, in the control unit 22, the electromagnetic on-off valve 5 and the flow control valve 21 are opened,
A lining resin is supplied and filled into the launcher 6 from the resin injector 3 to form a predetermined amount of resin group in the launcher 6. Then, the electromagnetic on-off valve 5 and the flow control valve 21 are closed, the electromagnetic on-off valve 11 is opened, and the supply pipe B is lined while controlling the resin group E to the moving speed V again as described above. At this time, as long as the moving speed V is maintained 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. The pressure of the pressurized gas controlled by the pressure is also maintained at a substantially constant value. After the resin group E reaches the unlined position of the supply pipe B, the resin is consumed by the lining as described above, and the length of the resin group E is reduced. The lining is advanced while gradually decreasing. Then, the length of the resin group becomes substantially zero, the elapsed time from when the pressurized gas blows through and drops to the atmospheric pressure is approximately 2t, and the length to the lining end position is also approximately 2. 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 supply 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 presses the resin group E. The pressurized gas blows into the branch pipe A. For this reason,
The measured value of the pressure measuring means 14 drops rapidly, and becomes substantially the atmospheric pressure. This is determined by the control unit 22. This is the expected elapsed time (n × t) (where n is the number of times the resin is filled, and t is the length of time required to complete one lining of the resin group)
It is determined whether or not a sharp pressure drop as described above has occurred in a shorter (n-1) t + t '(where t'<t). That is, it is determined that the resin group E 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. is there. In the case of t't, there is a problem of a measurement error. Therefore, it is better 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 22. That is, the control unit 22 issues a command for refilling the resin if the error is within the error range, and outputs an end command if the error is not within the error range. When lining the branch pipe A later, if the amount of resin remaining from the supply pipe B remaining in the branch pipe A is unknown, the resin group length in the lining process of the branch pipe A changes. The residual resin is removed before the lining of the branch pipe A, or the residual resin is stored in the memory of the control unit 22 and stored in the branch pipe A.
When the resin group E reaches the branching point (connection point with the supply pipe B in the branch pipe A) at the time of lining, the control unit 22 is adjusted so as to correct the length of the resin group to which the residual resin amount is added. May be calculated. After the resin lining of the supply pipe B is sequentially performed in this manner, a receiver 23 composed of a transparent pipe or the like is connected to the open end of the supply pipe B as shown in FIG. A cylinder 25 for pressurized gas such as compressed air is connected to the receiver 23 via a flow control valve 24, a throttle valve 26 is connected to a branch of the receiver 23, and a pressure gauge 27 and a flow meter 28 are connected. Is provided. In this state, about branch pipe A,
As shown in FIG. 6, by connecting the launchers 6 of the same size, the resin lining on the inner surface of the pipe is realized in the same manner as in the case of the supply pipe B. At this time, pressurized gas is supplied into the supply pipe B from the cylinder 25 via the flow control valve 24, and the throttle valve 26 is closed. And, for example, branch pipe A
The pressure of the pressurized gas pressing resin group E is 1.5kg / cm
Then, a slightly lower pressure, for example, 1.3 kg / cm, is held in the supply pipe B. In this case, as described above, the pressurized gas that presses the resin group E in the branch pipe A gradually drops when the resin is consumed for the lining and the resin group length is shortened. Adjusting the regulating valve 24 by the control unit 22, the pressure difference is, for example, 0.2 kg / cm
It is good to control so that it is maintained. As a result, as shown in FIG. 7, when the resin group E reaches the connection point between the branch pipe A and the supply pipe B in the lining process of the branch pipe A, the amount of the resin (predetermined amount) corresponding to the pressure difference is increased. Invade. At this time, the pressurized gas in the supply pipe B is compressed by the penetrating resin E ', and the pressure rises (corresponding to the pressurized gas pressure for pressing the branch pipe A side). The control unit 22 analyzes the data, issues a command, and closes the flow control valve 24. In the control unit 22, the branch resin calculating means
A reduction amount of the resin group E, that is, an amount of the penetrating resin E ′ is calculated from a predetermined formula and conditions such as a pressure difference by 111, and the target value calculation means 110 matches the target pressure of the pressurized gas in accordance with the reduction amount. (The length of the resin group E is inversely proportional to the set moving speed and proportional to the target pressure). Then, the resin is consumed for the lining in the branch pipe A, and the infiltration resin is held in the supply pipe B until the resin group disappears and the pressurized gas blows through (No. 8).
When the internal pressure in the branch pipe A falls to the atmospheric pressure when the air blows through, the penetrating resin E 'is discharged into the branch pipe A by the gas pressure on the supply pipe B side and remains there (see FIG. 9). ). The control unit 22 calculates the amount of resin that has entered the supply pipe B from the gas pressure difference at that time, the inner diameter of the supply pipe B, and the like, thereby obtaining the resin master after passing through the connection point (branch) to the supply pipe B. Is corrected, and the moving speed V of the resin group is kept constant. When the intruding resin is discharged from the supply pipe B into the branch pipe A, the control unit 22 detects this by a decrease in the pressure indicated by the pressure gauge 27, opens the flow control valve 24 again, and pressurizes the pressurized gas from the cylinder 25. At the required pressure into the supply pipe B. Therefore, the next resin group is filled in the branch pipe A, and the corresponding supply pipe B is filled.
When the resin passes through the connecting point, the resin E 'discharged and left in the previous branch pipe A is collected, but the same amount of resin enters the supply pipe B again. In the process of being sent 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 repeatedly performed, and the lining resin group is finally discharged to the receiver 29 provided at the other end of the branch pipe A. Until the lining work continues. Then, when the lining resin group reaches the receiver 29, the resin is received in the receiver tank 30, and the pressurized gas blows through and drops to the atmospheric pressure. Is detected. Finally, a required amount of resin group is supplied and filled into the branch pipe A, and when the resin group is pressed with a pressurized gas, the resin finally enters the supply pipe B in a fixed amount as described above. At this time, the control unit 22 detects the intrusion of the resin into the supply pipe B by the pressure gauge 27 and closes the flow control valve 24, and when a predetermined time elapses, that is, in the branch pipe A, the resin group E After passing through the connection point with the supply 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 supply pipe B is gradually released to the atmosphere via the throttle valve 26,
It is pushed by the pressurized gas in the branch pipe A and moves inside the supply pipe B, and is consumed as a lining layer in this process or is pushed as it reaches the receiver 23. In this process,
The flow meter 28 measures the discharge amount of the pressurized gas, and the control unit 22 corrects the flow amount of the pressurized gas supplied to the branch pipe A in consideration of the discharge amount. Then, at the stage when the intruding resin reaches the receiver 23 or when the pressurized gas on the side of the branch pipe A blows through the receiver 23 (when the intruding resin is consumed as the lining layer), the throttle valve 26 is used.
Close. In this way, after the resin in the supply pipe B that is successively connected to the branch pipe A is disposed, the resin group that has passed through the branch pipe A is discharged to the receiver 29, thereby completing the finish lining. (See Fig. 10). In the above embodiment, at the time of finishing lining of the branch pipe A, a relief valve 31 is provided at the open end of the supply pipe B as shown in FIG. 11, and the resin group E passes through a connection point with the branch pipe A. The resin that has sometimes entered may be moved in the supply pipe B at a required speed by the pressurized gas supplied to the branch pipe A and the degree of restriction of the relief valve 31 and sent to the receiver 23. Alternatively, the receiver 23 may be formed of a tubular body in place of the relief valve 31, and a terminal may be formed with a small hole for throttling, so that the receiver 23 has substantially the same function as the relief valve 31. Good.

【The invention's effect】

The present invention has been described in detail above.The target pressure is calculated from the moving speed corresponding to the amount of the resin group supplied in the installation pipe and the lining film thickness, and the target pressure is compared with the actual pressure to calculate the differential pressure. By obtaining this as a basis for correcting the supply amount of the pressurized gas, feedback control in the pipe inner surface lining can be realized. For this reason, the film thickness of the lining on the inner surface of the pipe can be managed with high accuracy. Also, when the resin is consumed by the lining of the inner surface of the pipe or decreases due to separation and intrusion into the branch pipe, the correlation between the moving speed of the resin group and the target pressure of the pressurized gas is corrected. As a result, there is no possibility that the lining film thickness becomes non-uniform.

[Brief description of the drawings]

FIG. 1 (A) is a schematic configuration diagram showing an embodiment of the present invention, FIG. 1 (B) is a functional block diagram structurally showing the functions of arithmetic processing in a control unit, and FIG. 2 is a repair. Explanatory drawing showing the situation of the existing pipe to be installed, FIG. 3 is an explanatory view showing the situation of the resin lining of the supply pipe, FIG. 4 is a time chart showing the repeated situation of the resin lining, and FIG. 5 is an intrusion at the open end of the supply pipe. FIG. 6 is an explanatory view showing a resin countermeasure means, FIG. 6 is an explanatory view showing a resin lining state of a branch pipe,
FIG. 7 is an explanatory view showing a situation when the resin group reaches the branch to the supply pipe in the branch pipe, FIG. 8 is an explanatory view showing a situation after the resin group has passed through the branch, and FIG. Figure shows the situation when pressurized gas blows through the branch pipe, Figure 10 shows the situation at the time of finish lining, and Figure 11 shows the measures taken against resin entering the supply pipe at the stage of the finish lining. FIG. 12 is an explanatory diagram showing another example of the means, and FIG. 12 is a characteristic diagram showing a relationship between a lining film thickness and a resin conveying speed (moving speed). DESCRIPTION OF SYMBOLS 1 ... Resin supply device 2 ... Pressurized gas supply device 13,16 ... Flow rate adjusting means 14,17 ... Pressure measuring means 15,18 ... Pressure measuring means 104 ... Target pressure setting means 105 ... Pressure calculation Means 106 Comparing means 108 Supply flow rate setting means 109 Resin group moving amount calculating means 110 Target value correcting means

Claims (3)

(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. A resin supply device for supplying a predetermined amount of the resin group to an existing pipe, and a pressurized gas supply for supplying a pressurized gas for moving the resin group in the existing pipe. An apparatus, a flow rate adjusting means for adjusting the supply amount of the pressurized gas, a flow rate measuring means for measuring a flow rate of the pressurized gas passing through the flow rate adjusting means, and measuring a pressure of the pressurized gas in the existing pipe. Pressure measuring means, and corresponding to the actual pressure of the pressurized gas corresponding to the actual moving speed of the resin group measured by the pressure measuring means, and a preset target moving speed of the resin group. To the target pressure of the pressurized gas to be Comparison operation means, and supply flow rate setting means for setting the supply amount of the flow rate adjustment means from the total amount of supply of the pressurized gas obtained by the differential pressure and flow rate measurement means obtained by the comparison operation means. The moving speed of the resin group is maintained at a target value by controlling the flow rate adjusting means so as not to generate the differential pressure, and the film pressure of the lining film formed on the inner surface of the pipe is controlled. A control system for repairing the inner lining of pipes. 2. A resin group moving amount calculating means for calculating a moving amount of the resin group in an existing pipe from a measured value of the flow rate measuring means and a measured value of the pressure measuring means, and a moving amount of the resin group corresponding to the moving amount of the resin group. 2. A target value correcting means for calculating a consumption amount of the resin group and correcting a target pressure of the pressurized gas so as to maintain a moving speed of the resin group at a target value. Control system for repairing the inner lining of pipes. 3. When the resin group enters the branch pipe in the process of moving the resin group in the existing pipe, the reduction amount of the resin group is calculated, and the moving speed of the resin group is maintained at a target value. 2. The control system according to claim 1, further comprising target value correcting means for correcting the target pressure of the pressurized gas.