JPH01293160A - Device for continuously injecting lining resin - Google Patents

Abstract

PURPOSE:To reduce the lining time by connecting one end of a charging cylinder to a low-pressure gas feeder through a stop valve, and connecting the other end to a supply launcher through a stop valve. CONSTITUTION:The supply launcher is connected to an existing pipeline A, and a lining starting command is given to a control unit 23. The gas compressed by a compressor 12 is sent by the control unit 23 to a resin tank 1 through a pipeline 17 to actuate a plunger 2, and hence the lining resin is packed in the charging cylinder 6 to constitute a resin body. When a specified amt. of resin is packed, a stop valve 4 is closed, and a stop valve 8 is opened. Consequently, the compressed air in an air tank 13 is introduced into the charging cylinder 6 through a flow control valve 14 and sent into the pipeline A through the launcher 11, and the inner surface of the pipe is lined.

Description

[Detailed description of the invention] [Industrial application field]

The present invention applies a uniform resin lining to the inner surface of existing pipes such as gas pipes and water pipes installed underground in the pipe inner surface lining 'FIAI@', which applies a uniform resin lining to the inner surface of the existing pipes such as gas pipes and water pipes installed underground. This invention relates to a continuous injection device for lining resin for supplying resin.

[Conventional technology]

In general, with existing pipes such as gas pipes and water pipes installed underground, there is a risk of leakage due to the occurrence of WJ corrosion holes and loosening of joints over time. For maintenance purposes, the existing pipes are repaired by greasing the inner surface of the pipes at a required time after construction, while the pipes are still in their installed state. Therefore, as published in Japanese Patent Application Laid-open No. 63-65983,
The inside of the pipe at one end of the existing pipe is filled with a liquid resin group so as to fill and block the inside of the pipe, and the resin group is made to flow with a predetermined low-pressure gas to line the inner surface of the pipe with the required film thickness. A surface lining repair method was proposed. here,
A launcher is connected to one end of the opened existing piping, and a resin for lining is filled from a resin tank connected to the launcher to form a resin mass inside the launcher, which is then supplied from the free end of the launcher under low pressure. Gas is supplied into the existing pipes. When the resin mass flows inside the existing pipe and is consumed by the lining on the inner surface of the pipe, the launcher is filled with resin again from the resin tank, a resin mass is formed inside the launcher, and low-pressure gas is again applied to the existing pipe. Supply into the pipe. By repeating such operations, the inner surface of the existing pipe is repaired for a predetermined length.

[Problem to be solved by the invention]

In such a pipe inner lining repair method, the resin lining work is substantially interrupted during the time the launcher is being filled with resin from the resin tank, resulting in wasted time. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a continuous injection device for lining resin that can supply a resin mass to an existing pipe without waiting for the resin to be supplied to the launcher.

[Means for Solving the Problems] Therefore, in the present invention, the outlet passage of the resin tank is branched into two, each of which is communicated with a separate filling cylinder via an on-off valve, and one end of the filling cylinder is are connected to a low-pressure gas supply device through on-off valves, and the other ends of the filling cylinders are connected to a supply launcher through on-off valves, respectively, and one filling cylinder is filled with resin for lining from a resin tank. During filling, the other filling cylinder is communicated with the low-pressure air f41' supply device and the launcher, and the resin mass in the filling cylinder is sent into the existing piping via the launcher, and the resin lining on the inner surface of the pipe is The switching control of the opening/closing valve is performed so as to perform the following.

[For production]

Therefore, while the resin mass in one filling cylinder is being sent with predetermined low pressure gas into the existing piping through the supply launcher and being applied to the resin lining on the inner surface of the pipe, the other filling cylinder is being lined from the resin tank. Since the resin is filled to form a resin mass, as soon as the resin is consumed in the inner lining of the tube, low pressure gas is supplied to the filled cylinder by switching the on-off valve. The lining resin can be fed into the Ieta pipe through the launcher, and the work of lining the inner surface of the pipe can begin. Therefore, the conventional wasted time required for filling the launcher with resin is eliminated, and the usable time can be effectively utilized for lining work.

【Example】

Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings. In the figure, numeral 1 is a resin tank, and plunger 2
It has a cylindrical shape with an interior. And the above tank 1
A liquid resin for lining is stored inside, and 2
The outlet passage is branched into two opening/closing valves 4 and 5 via i3.
is connected to. The above-mentioned resin for lining is, for example, a two-component curing resin at room temperature, which is a mixture of a base resin and a hardening agent, of which the base resin is mainly composed of unsaturated polyester resin, vinyl ester resin, epoxy resin, urethane resin, etc. a composition,
It has thixotropic properties by adding face t1, thixotropic agent, etc. (for example, TIIO at 300.0OOcps).
2゜The on-off valves 4 and 5 communicate with the cylindrical filling cylinders 6 and 7 at their proximal end sides, respectively, and the proximal ends of the filling cylinders 6 and 7 are connected to low pressure via the on-off valves 8 and 9. It communicates with a gas supply bag "j!lio," and its tip communicates with a supply launcher 11 configured in a figure 7 shape via gate-type on-off valves 8a and 9a. The low-pressure gas supply device 10 is equipped with a compressor 12, an air tank 13, a flow rate adjustment valve 14, and 15.
In addition, a three-way switching valve 1 provided on the output side of the compressor 12
6 is provided with a pipe line 17 that communicates with the resin tank 1, and the pipe line 17 is further provided with a flow rate adjustment valve 18.
is the provision. Further, the low pressure gas supply device is provided with a flow meter 19.20 and a pressure gauge 21.22, the detection signals of which are supplied to the control unit 23. The control unit 23 also includes the flow meter 19.
．． 20. Calculations are performed according to the output information of the pressure gauges 21 and 22 and the control program, and the flow rate adjustment valve 14.
15.18. Furthermore, on-off valves 4, 5, 8°9, 8a
, 9a. When performing lining repair using the device of the present invention, the existing pipe A, such as a branch pipe or main pipe (applicable to the Hongnae pipe), is divided into repair sections of a predetermined length, and both ends are opened. In order to do this, vertical shafts B and C as shown in FIG. 2 are formed at corresponding locations, and the end of the existing pipe A is opened there by removing or cutting the flange. Furthermore, meters will be removed from the inner pipe connected to the existing pipe A, and the upper end of the pipe will be opened. Then, pressurized air is passed through the branch pipe A and the inner pipe to remove dust and the like inside. Next, for example, the in-service pipes may be lined with resin in advance and the resin lining method described below for existing pipes can be applied as is), and then appropriate measures to prevent resin intrusion are taken in preparation for resin lining of existing pipe A. Keep it. Then, the supply launcher 11 is connected to the Iet installation pipe A, and a lining work start command is given to the controller 1-roll unit 23 by a switching operation or the like. In the initial stage, the control unit 23 first opens one of the opening/closing valves 4 and 8a, adjusts the opening degree of the flow rate adjustment valve 18, and switches the three-way switching valve 16 so that the output of the compressor 12 is reduced. The pressurized gas (for example, pressurized air) is passed through the pipe 17.
The resin for lining is sent to the resin tank 1 through the cylinder 1, and the plunger 2 is operated to fill the filling cylinder 6 with resin for lining, thereby forming a resin mass therein. When the required filling amount mx is reached based on the adjustment value of the time and flow Jl adjustment valve, the control unit I.23 closes the on-off valve 4 and closes the on-off valve 8.
to open. As a result, the pressurized gas (for example, pressurized air) stored in the air tank 13 flows into the filling cylinder 6 via the flow rate adjustment valve 14, pushing the resin group inside the filling cylinder G,
The resin is sent into the existing pipe A via the launcher 11, where the inner surface of the pipe is lined with a film thickness that does not correspond to the flow rate of the resin. At this time, the on-off valve 8a is open, and the on-off valves 5, 9, and 9a are closed. At the stage where the resin mass passes through the launcher 11, the on-off valves 5 and 9a are opened, and the resin in the resin tank 1 is filled into the filling cylinder 7 with pressurized air applied via the pipe line 17. When filling is completed, the on-off valves 5 and 9a are closed, the three-way switching valve 16 is switched, and the pressurized gas (for example, pressurized air) from the compressor 12 is supplied to the air tank 13. In this way, during and after filling the filling fm71111 with resin, the supply control of low pressure gas (for example, low pressure air) via the filling cylinder 6 is realized by the control unit 23. In this case, the calculation basis in the control unit 23 depends on the following formula. First, the amount Q of low-pressure gas that has flowed into the existing pipe A (diameter D)
1, pressure P1 (for example, 0.8 kq/cn+1), then π/4・D2 ・λ1 ・P1=Q1 ・po...(
Since the relationship is as shown in 1), if Ql, po, and pl are measured at time T1 when the resin group starts to be fed by low-pressure gas, then
λ1 can be found from equation (1). Furthermore, here,
The amount Q1 of gas flowing into the existing pipe A is determined by the flowmeter 19.
20, each with a total of 1111J obtained by the difference between the values F1 and F2. In this case, if a mass flow meter is used as the flow meter 19, 20, the calculation will be easier because there will be no influence of gas temperature. In addition, here 11 is the position of the resin group at time T1,
Po and Pl are the measured values of the pressure gauges 21 and 22, and D is the inner diameter of the lining of the existing pipe A. Similarly, pressure P2 and inflow amount Q at time T2
The position of the resin group obtained by measuring and calculating 2 is fl, 2
Then, the flow distance (■) of the resin group becomes ■=Δλ/Δt. However, it is assumed that Δ2=12-21 Δt=72-'r1. Therefore, the predetermined time interval Δt is set by the clock of the oscillator in the control unit 23, and each time the amount of inflow gas flowing into the pipe from the flowmeter 19, 20 and the pressure gauge 21 are measured.
．． The respective pressures are measured from 22, and the flow rate regulating valves 14 and 15 are controlled so that each instantaneous resin flow rate (2) is maintained at a constant predetermined value. In the existing pipe A, the length of the resin aggregate decreases because it is consumed in lining the inner surface of the pipe, but since the flow rate is constant, the pressure of the pressurized gas decreases approximately linearly (Fig. 3). reference). In the process of consuming the resin in the resin group, the resin group length gradually becomes shorter, and at the same time, the pressure of the pressurizing gas for keeping the resin flow rate constant decreases almost linearly, until the resin group length reaches 0.
, the pressure of the pressurized gas naturally becomes atmospheric pressure. If the resin mass is consumed before the resin lining in the existing pipe A is completed, or if the resin mass is led out into the receiver 24 at the other end of the existing pipe A and received in the receiver tank 25, low-pressure gas blows through the pipe, causing a sudden drop in pressure. At this point, the control unit 23
stores in memory the length to the position where the resin lining is completed, the amount of gas at that time Q, the elapsed time to, etc.
Close the on-off valve 8. Next, open/close valves 9 and 9a
is opened, and the resin mass filled in the filling cylinder 7 is sent into the existing pipe A via the launcher 11 with low pressure gas. Then, the on-off valve 4 is opened again, and the three-way switching valve 16 is switched to supply pressurized air from the compressor 12 to the resin tank 1 via the pipe line 17, filling the filling gap 6 with resin. When filling is completed, the on-off valve 4 is closed and the three-way switching valve 16 is switched to supply pressurized air from the compressor 12 to the air tank 13. Based on the result of the calculation, the control unit 23 determines whether filling 1! Launcher 1 of the resin group in J7
1 into the existing pipe A, but at this time, while the lining resin mass moves at a predetermined speed V inside the previously lined existing pipe A, the thickness M of the lining inside the pipe does not change, therefore, The length of the resin group does not decrease further, and the pressure of the pressing gas is also maintained at a substantially constant value. After the resin mass reaches the unlined position at the end of the pipe A, the resin is consumed by the lining, the length of the resin mass decreases, and the pressure of the pressurized gas gradually decreases. The progress of lining is the same as described above. In this case, the resin aggregate becomes approximately O, and the pressure of the pressurized gas becomes atmospheric pressure again, but the elapsed time up to this point is approximately 2to, and the length to the end position of the manifold lining is also approximately 2L. In this way, the lining length is successively extended by repeating filling with resin and lining by pressing. When the lining of the existing pipe A is completed and the resin block reaches the open end with the length still remaining, the resin block passes through the receiver 24.
As the flow resistance of the α-resin group inside the pipe A rapidly decreases, the pressing force controlled by the control unit 23 also rapidly decreases to atmospheric pressure. Also, the elapsed time until the pressing force decreases to atmospheric pressure is shorter than the expected (nXt) (n-Bt, +t' (however, t'<t) (
(See Figure 3). That is, based on the sudden decrease in the pressing force and the difference between the elapsed time and the predicted elapsed time, it is determined that the resin group has not reached the receiver 24, and the corresponding lL? Finish the lining repair for Q pipe A.

【Effect of the invention】

The present invention has been described in detail above, and during the process in which the resin mass in one filling cylinder is sent by low-pressure gas into the existing piping through the supply launcher and lining the other filling cylinder, the resin is transferred to the other filling cylinder. Since the resin is filled, the resin mass is alternately sent into the existing piping between fillings, which eliminates the conventional wasted time required to fill the launcher with resin, and allows the pot life to be effectively utilized for lining work. can.

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram showing an embodiment of the present invention, FIG. 2 is a schematic block diagram showing the state of lining repair of existing piping, and FIG. 3 is a time chart showing the state of repeating resin lining. DESCRIPTION OF SYMBOLS 1...Resin tank, 2...Plunger, 3...Outlet passage, 4, 5, 8, 8a, 9, 9a=--
Opening/closing valve, 10-...Low pressure gas supply device.

Claims (1)

[Claims] The outlet passage of the resin tank is branched into two, each of which communicates with a separate filling cylinder via an on-off valve, and one end of the filling cylinder is communicated with a low-pressure gas supply device via an on-off valve, and The other end of the filling cylinder is connected to the supply launcher via an on-off valve, and while one filling cylinder is being filled with lining resin from the resin tank, the other filling cylinder is supplied with the low pressure gas. It is characterized by being configured to be in communication with the apparatus and the launcher, and to control switching of the opening/closing valve so as to send the resin mass in the filling cylinder into the existing pipe through the launcher and to perform resin lining of the inner surface of the pipe. Continuous injection equipment for lining resin