JPH01293167A - Method for repairing lining of inner surface of pipe - Google Patents

Abstract

PURPOSE:To efficiently repair a lining by previously packing a lining resin in a cassette type charging cylinder, connecting one end of the freely detachable and attachable cylinder to one end of a pipeline, and forcing a resin body into the pipeline from the cylinder. CONSTITUTION:A compressor 14 is operated, the compressed air is stored in an air tank 16, a stop valve 12 is opened, the air is supplied to a resin tank 10 at a pressure set by a flow control valve 15, hence a plunger 9 is pressed, and the liq. lining resin is supplied into the charging cylinder 1. The cylinder 1 is connected to a supply pipe B through an end connection body 2. The gas compressed by a compressor 17 and stored in an air tank 18 is passed through a stop cock 20 via a flow control valve 19, introduced into a supply pipe 21, and then supplied to the cylinder 1. Consequently, the resin body is charged into the supply pipe B, and lining is carried out. By this method, waste of time can be obviated.

Description

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

The present invention relates to a method for repairing the inner surface of existing pipes, such as gas pipes and water pipes, which are installed underground, by applying a uniform resin lining to the inner surface of the pipes while the pipes are still installed.

[Conventional technology]

In general, with existing pipes such as gas pipes and water pipes installed underground, there is a risk of leaks due to corrosion holes and loosening of joints over time, so leak prevention and maintenance are necessary. Therefore, after construction, at a required time, the existing pipes are repaired by lining the inner surface of the pipes with resin while they are still installed. 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 piping. Then, when the resin mass flows in the existing piping under the pressure of the above-mentioned low-pressure gas and the resin is consumed in the inner surface of the pipe, the launcher is filled with resin again from the resin tank, and the resin mass is poured into the launcher. formed and then supplied again into the existing piping with low-pressure gas. By repeating such operations, the above r
We are repairing the inner surface of the e1 crotch pipe.

[Problem U that the invention seeks to solve]

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. Further, the work environment may be difficult, such as in a narrow space, where it is difficult to bring the launcher and the resin tank into the space. The present invention has been made based on the above circumstances, and it is possible to prepare a cassette-type filling space and fill the above-mentioned filling tube with resin from the resin tank at another location in advance, so that the filling tube can be used in narrow spaces. The purpose of the present invention is to provide a method for repairing the lining of the inner surface of a pipe, which enables the supply of resin for lining work even in harsh working environments, and eliminates wasted time for filling.

[Means to solve the problem]

Therefore, in the present invention, a liquid resin group is filled into the pipe at one end of the existing pipe 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 form a desired film on the inner surface of the pipe. In the lining repair method for the inner surface of a pipe that involves thick lining, resin for lining is filled in advance in a cassette-type filling space, one end of the filling space is removably connected to one end of the existing pipe, and the other end is filled with low-pressure gas. Connect the supply pipe removably. The resin mass is fed under pressure from the filling cylinder into the existing pipe using the low pressure gas to line the inner surface of the existing pipe.

[For production]

Therefore, with this repair method, by simply connecting a filling cylinder to one end of the existing piping and connecting a low-pressure gas supply pipe between the above-mentioned filling, resin lining work using low-pressure gas can be started immediately, which is different from the conventional method. As a result, there is no need to wait for time to fill the launcher with resin. Furthermore, even if the work environment is harsh, such as in a narrow space where a resin tank or the like cannot be brought in, it is sufficient to simply bring in a filling cylinder, making it easy to supply resin for lining work.

【Example】

Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings. In the figure, reference numeral 1 indicates a cassette-type filling cylinder used in the repair method of the present invention. The filling cylinder 1 is, for example, equipped with a connection port body 2 at one end of a pipe-shaped filling cylinder main body 1a of a predetermined length, and the connection port body 2 is equipped with a hinge 3, and a pin is attached to the hinge 3. A cam 5a formed on the clamp lever 5 faces the inside of the connection port body 2 through a slit 6 formed in the connection port body 2. Furthermore, a backing 8 is provided inside the connection port body 2. The lining resin filled in this filling cylinder 1 is, for example, a two-component curing resin at room temperature, which is a mixture of a base resin and a hardening agent. It is a composition whose main component is urethane resin, etc., and it has thixotropic properties by adding pigments, thixotropic compounds, etc. (for example, 300.
0OOcpsT T I value 6). As shown in FIG. 2, the apparatus for filling the filling cylinder 1 with the lining resin consists of a cylindrical resin tank 10 having a plunger 9 therein. Same pouring nozzle 11. Opening/closing valve provided on the pouring nozzle 11 12° motor (or motor) 13. Compressor 14° Air tank 16. A flow rate adjustment valve 15 is provided. First, a plurality of filling cylinders 1 as described above are prepared, and one of them is detachably connected to the nozzle 11 via the connection port 2. That is, as shown in detail in FIG. 3, the tip of the nozzle 11 is inserted into the connection port body 2 and abuts against the backing 8, and the clamp lever 5 is operated to clamp the nozzle 11 with the cam 5a. . In this case, a cap 7 made of synthetic resin or the like is removably fitted onto the outer end of the filling cylinder 1, and the cap 7 is provided with an air vent hole 7a. In this state, the filling cylinder 1 is filled with resin using the apparatus for filling lining resin as described above. That is, by driving the motor 13, the compressor 14 is heated, pressurized air is stored in the air tank 16, and when the on-off valve 12 is opened, air is supplied to the resin tank 10 at the pressure set by the flow rate adjustment valve 15. The liquid resin for lining is supplied into the filling cylinder 1 through the nozzle 11 by pressing the plunger 9. At this time, the air in the chamber ijIm1 is discharged from the air vent hole 7a. When filling is completed, operate the clamp lever 5 to release the cam 5a from the nozzle 11.
Remove the connection port body 2 from the nozzle 11 and insert, for example, the fourth
As shown in the figure, a synthetic resin cap 7' is fitted. In this way, the #4 cylinder 1 is filled with a predetermined amount of lining resin to form a cassette. On the other hand, the existing piping to be lined and repaired in the present invention is a branch pipe A buried underground (in this example, a branch pipe is shown, but it may also be a main pipe), or a pipe with one end protruding above ground and connected to a meter. This is the Hongnae pipe B, which is branched from the branch pipe A. When repairing the lining according to the present invention, preparations for repair are made in parallel with or in advance of filling the filling cylinder 1 with resin. That is, branch pipe A is divided into repair sections of a predetermined length, both ends of which are opened, and vertical shafts C and D are formed in the corresponding locations as shown in Figure 5, and the ends of branch pipe A are repaired there. , by removing or cutting the flange. Furthermore, meters are removed from the service pipe B connected to the branch pipe A, and the upper end of the pipe is opened. Then, pressurized air is passed through the branch pipe A and the service pipe B to perform cleaning such as removing dust inside. Next, for example, the filling cylinder 1 is directly connected to the supply pipe B via the connection port body 2 (the filling cylinder 1 may be connected via an intermediate pipe line). In this case the cap 7.16 is removed. Then, a required low-pressure gas (for example, low-pressure air) is supplied to the free end of the filling cylinder 1, and the resin mass in the filling cylinder 1 is introduced into the internal pipe B. Such resin supply and lining conditions are shown in FIG. In this case, the low pressure gas supply device E has a configuration as shown in FIG. The supply device E includes a compressor 17, an air tank 18. It is equipped with flow adjustment valves 19, 31 and an opening/closing cock 20. A supply pipe 21 is connected to the tip of the opening/closing cock 20, and a lamp similar to the above-mentioned connection port body 2 is connected to the tip of the supply pipe 21. Connection port body 2 equipped with a mechanism
2, which is used to detachably connect to the free end of the filling cylinder 1. However, due to the action of the compressor 17, the air tank 1
The pressurized gas (pressure air) stored in 8 passes through the flow rate adjustment valve 19, the opening/closing cock 20, enters the supply pipe 21, and further enters the filling cylinder 1, and the resin group therein is transferred to the supply pipe B.
This material is sent inside the tube to create a resin lining for the inner surface of the tube. Since the thickness of the resin lining at this time depends on the flow rate of the resin, it is controlled to a constant thickness by a control unit 23 provided in the supply device. In other words, when the operator gives a control start command to the control unit 23 by operating a switch or the like, the control unit 23 receives output information from the flowmeters 24, 25 and pressure gauges 26, 27 installed in the pipes and the like. Calculations are performed from the control program to adjust the flow rate and the opening degree of the lt adjustment valve 19 to adjust the flow rate of the resin in the Hongnae pipe B. In this case, the calculation basis in the control unit 23 depends on the following formula. First, Ji (
h, pressure P1 (for example, 0.6kQ/cn2), then yr/4 − D” −1,1・Pl = Q1
・ Since the relationship is Po - (1), Ql, p, pl at time T1 when the resin group starts to be fed by low pressure gas
By measuring, 11 can be found from equation (1). Here, iQl of the gas flowing into the service tube B is
It is obtained by the difference between the measured values F1 and F2 of the flowmeters 24 and 25. In this case, if quality 1 flowmeters are used as the flowmeters 24 and 25, calculations will be easier because there will be no influence of gas temperature. Moreover, here 21 is the position of the resin group at time T1,
PO and PI are the measured values of the pressure gauges 26 and 27, and D is the inner diameter of the lining of the service pipe B. Similarly, pressure P2 and inflow amount Q at time T2
If the position of the resin group obtained by measuring and calculating 2 is set to 12, the flow velocity V of the resin group becomes -8/Δt. However, ΔJl=12-Jt1 Δt=T2-TI. Therefore, the predetermined time interval Δt is set by the tarok of the oscillator in the control unit 23, and the amount of inflow gas flowing into the pipe from the flowmeter 24, 25 and the pressure gauge 26 are measured each time.
．． The respective pressures are measured from 27, and the flow i adjustment valves 19 and 31 are controlled by ff1lJ so that each instantaneous resin flow rate (2) is maintained at a constant predetermined value. In service pipe B, the length of the resin aggregate decreases because it is consumed in lining the inner surface of the pipe, but since the flow velocity is constant, the pressure of the pressurized gas decreases approximately linearly (No. 9 (see figure). t! before the resin lining of the inner surface of the service tube B is completed over the entire length of the tube! When one polymer group of resin is consumed, the resin group length gradually becomes shorter, and at the same time, the pressure of the pressurizing gas to keep the resin flow rate constant decreases almost linearly, and when the resin group length reaches 0, Naturally, the pressure of the pressurized gas is also atmospheric pressure. The inflow amount Q of gas up to this point, the length up to the position where the resin lining is finished, the elapsed time to, etc. are stored in the memory, and the opening/closing cock 20 is closed. At the same time, an appropriate notification means is used to instruct the operator to replace the filling cylinder in order to continue the resin lining work on the service pipe B, or to complete the resin lining work (when blowing into the branch pipe A or wood pipe). If the resin lining work is to be continued, at this stage, the connecting bodies 2 and 22 are removed and the empty filling cylinder is replaced with the newly filled filling cylinder 1. Then, the opening/closing cock 20 is opened again to feed the resin mass in the filling cylinder 1 into the in-service pipe B, and according to the result calculated by the control unit 23, the resin mass is transferred into the Hongnai pipe while maintaining the resin flow distance ■. Let it flow in B. At this time, while the lining resin group moves at a predetermined speed in the previously lined pipe, the film thickness of the lining inside the pipe remains unchanged, so the length of the resin group does not decrease, and the pressure of the pressing gas increases. is also held at a substantially constant value. After the resin group reaches the unlined position at the end of the pipe B, the resin is consumed by the lining, the length of the resin group 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 becomes approximately 2to, and the length to the end position of the lining also becomes 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 service tube B is completed and the length of the VA resin block still remains and it reaches the connection point with the branch pipe, the resin block flows into the branch pipe, and the flow resistance of the resin block in the pipe B suddenly increases. Therefore, the pressing force controlled by the control unit 23 also rapidly decreases to atmospheric pressure. Further, the elapsed time until the pressing force decreases to atmospheric pressure is also shorter than the expected (nXt) (n-1)t+M<(!!7't) (see FIG. 9). That is, due to the sudden decrease in pressing force and the difference between the elapsed time and the predicted elapsed time, t! ! It is determined that the fat mass has reached the inside of the branch pipe, and the lining repair for the corresponding service pipe B is completed. In this way, it can be determined that the repair lining of pipe B has been completed, but if the resin is injected and the lining is performed once again using pressurized gas, the time required to reach the branch pipe will be the same as the previous time (n -1 ) t+t'.In this way, by making the repair lining time the same each time, it is also possible to determine whether the resin group has reached the branch pipe. In this way, after sequentially lining the service pipes B with resin, each service pipe B is lined with an appropriate amount of IJiI.
If the intrusion prevention measures are omitted, for the branch pipe A, as shown in Fig. 8, the filling cylinder 1 is connected to the open end of the branch pipe A via the connection port body 2, and the other end of the filling cylinder 1 is connected to the connection port. The supply pipe 21 is connected through the body 22, and low-pressure gas is sent to send the resin mass into the branch pipe A. Under the control of the control unit 23, resin lining is performed in the same manner as described above. In addition, in the above-mentioned embodiment, anticipating the case where it is impossible to carry the filling cylinder 1 into the standing pipe C during the filling interval 1, the elbow 28 is prepared and the filling cylinder 1 is inserted into the branch pipe A.
This makes connection work easier. In the figure, reference numeral 29 is a receiver connected to the opposite end of the branch pipe A, and 30 is a receiver tank for storing the residual resin discharged to the receiver 29 at the end of resin lining. In the above embodiment, when the resin injector 10 fills the filling space 1 with resin, the compressor 14. Although an air tank 16 and the like are prepared, pressurized air is branched from the supply device E, which is used when supplying the resin mass of the filling cylinder 1 to the existing piping and repairing the lining of the inner surface of the pipe, to supply the resin to the filling cylinder 1. Of course, it may also be used as pressurized air for resin filling.

【Effect of the invention】

The present invention has been described in detail above, and by filling the resin for lining between fillings and making it into a cassette, it is possible to eliminate wasted time for resin supply when repairing the lining of the inner surface of a pipe, and to limit the amount of time wasted. This means that the available pot life can be effectively utilized. Further, even in small work sites where resin tanks, liners, etc. cannot be brought in, it is possible to improve work efficiency by allowing resin to be supplied at intervals between fillings.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the structure of the filling cylinder in the repair method of the present invention, Fig. 2 is a configuration diagram showing the work process of filling the filling cylinder with resin, Fig. 3 is a longitudinal sectional view of the main part, and Fig. 4 is a longitudinal sectional view of the main part. The figure is a longitudinal cross-sectional view of the cassette-shaped filling space, Figure 5 is a schematic configuration diagram of the preparation stage showing the repair section of the existing piping, and Figure 6 is a schematic configuration diagram showing the state of the resin lining for service pipe B. , Fig. 7 is a configuration diagram showing the low-pressure gas supply device, and Fig. 8 shows the support.
A schematic configuration diagram showing the state of resin lining for iA,
FIG. 9 is a time chart showing the repeated state of resin lining. DESCRIPTION OF SYMBOLS 1... Filling cylinder, 2... Connection port body, 10... Resin tank, 11... Output nozzle, 14... Compressor, 15... Flow rate adjustment valve, 16... Air tank,
17...Compressor, 18...Air tank, 19
...Flow rate adjustment valve, 20...Opening/closing cock, 21.
... Supply pipe, 22 ... Connection port body, 23 ... Control unit, 24.25 ... Flow meter, 26.27.
...Pressure gauge. Patent applicant Hatsuko Co., Ltd. Agent Patent attorney Nobu Kobashi Kazu

Claims (1)

[Claims] 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. In the surface lining repair method, resin for lining is filled in advance into a cassette-type filling cylinder, one end of the filling cylinder is removably connected to one end of the existing piping, and a low-pressure gas supply pipe is detachably connected to the other end. A method for repairing the lining of the inner surface of a pipe, characterized in that the inner surface of the existing pipe is lined by connecting the filling cylinder to the inside of the existing pipe and pressurizing the resin mass with the low-pressure gas into the existing pipe.