JP2598303B2 - Continuous injection system for lining resin - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to lining repair of existing pipes, such as gas pipes and water pipes laid underground, in which uniform resin lining is applied to the pipe inner surfaces as they are laid. ,
The present invention relates to an apparatus for continuously injecting lining resin for supplying resin to the existing pipe.

[Prior art]

In general, existing pipes laid underground, such as gas pipes and water pipes, may have corrosion holes and loosened joints due to aging, causing leaks. 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 pipe at one end of the existing pipe is filled with a liquid resin group so as to fill and close the inside of the pipe, and the resin group is filled with a predetermined low-pressure gas. A lining repair method for the inner surface of the pipe was proposed, in which the inner surface of the pipe was lined with a required thickness. 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 low-pressure gas is supplied into the existing pipe. Then, when the resin group flows in the existing pipe and the resin is consumed in the lining of the pipe inner surface, the resin is again filled into the launcher from the resin tank, the resin group is formed in the launcher, and the existing resin pipe is formed again with the low-pressure gas. Supply into the pipe. By repeating such an operation, the inner surface of the existing pipe is repaired for a predetermined length.

[Problems to be solved by the invention]

In such a lining repair method for the inner surface of the pipe, the time during which the launcher is filled with resin from the resin tank is:
Resin lining work will be substantially interrupted,
Wastes time. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an apparatus for continuously injecting a lining resin capable of supplying a resin group to an existing pipe without waiting for a resin supply to a launcher.

[Means for Solving the Problems]

For this reason, in the present invention, the outlet passage of the resin tank is branched into two, each of which communicates with each of the filling cylinders via the on-off valve, and one end of the filling cylinder is connected to the low-pressure gas via the on-off valve. The other end of the filling cylinder is communicated with a supply launcher via an opening / closing valve, and the other end of the filling cylinder is filled with a resin for lining from a resin tank. The filling cylinder is communicated with the low-pressure gas supply device and the launcher, and the resin group in the filling cylinder is sent into the existing pipe via the launcher,
The switching control of the open / close valve is performed so as to perform resin lining on the inner surface of the pipe.

[Action]

Therefore, in the process in which the resin group of one of the filling cylinders is sent at a predetermined low-pressure gas through the supply launcher into the existing pipe, and is being used for the resin lining of the inner surface of the pipe, the other filling cylinder is lined with the resin from the resin tank. Since the resin is filled to form a resin group, as soon as the resin is consumed in the lining of the inner surface of the pipe, the open / close valve is switched, and the low-pressure gas is supplied to the filled cylinder, The lining resin can be fed into the existing piping via the launcher, and the lining work on the inner surface of the pipe starts. Therefore, the conventional waste time required for filling the launcher with the resin is omitted, and the usable time can be effectively used for the lining work.

【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 tank, which has a cylindrical shape in which a plunger 2 is provided. A liquid resin for lining is stored in the tank 1.
It communicates with the on-off valves 4 and 5 through the outlet passage 3 branched into two. The resin for the lining is, for example, a room temperature two-part curable resin prepared by mixing a main agent and a curing agent, and the main agent is mainly composed of an unsaturated polyester resin, a vinyl ester resin, an epoxy resin, a urethane resin, or the like. The composition has a thixotropic property by adding a pigment, a thixotropic agent and the like (for example, a TI value of 6 at 300,000 cps). The open / close valves 4 and 5 communicate with one side of the base end side of the cylindrical filling cylinders 6 and 7, respectively, and the base ends of the filling cylinders 6 and 7 supply low-pressure gas through the open / close valves 8 and 9 respectively. The tip is connected to a supply launcher 11 configured in a Y-shape via gate-type opening / closing valves 8a and 9a. The low-pressure gas supply device 10 includes a compressor 12, an air tank 13, and flow control valves 14, 15, and a pipe communicating with the resin tank 1 via a three-way switching valve 16 provided on the output side of the compressor 12. Road 17, and
The pipe 17 is provided with a flow control valve 18. Also,
The low-pressure gas supply device includes flow meters 19 and 20 and a pressure gauge 2
1, 22 are provided, and the detection signal is supplied to the control unit 23. Further, the control unit 23 is provided with the flow meters 19, 2
0, by performing calculations in accordance with the output information of the pressure gauges 21 and 22 and the control program to control the flow rate adjustment valves 14, 15, 18 and further the opening / closing valves 4, 5, 8, 9, 8a, 9a. Has become. When performing lining repair using the apparatus of the present invention, the existing pipe A such as a branch pipe or a main pipe (which can also be applied to a service pipe) is divided into repair sections of a predetermined length, and both ends thereof are opened. In order to do so, uprights B and C as shown in FIG. 2 are formed at corresponding locations, and the end of the existing pipe A is opened by removing or cutting the flange. Further, with respect to the service pipe D connected to the existing pipe A, the meters are removed and the ground end is opened. Then, pressurized air is passed through the branch pipe A and the service pipe D to remove dust and the like inside. Next, for example, the internal pipe D is resin-lined in advance (the resin lining method for the existing pipe described below can be applied as it is), and then an appropriate resin intrusion prevention measure is prepared for the resin lining of the existing pipe A. Keep in mind. Thus, the supply launcher 11 is connected to the existing pipe A, and a lining work start command is given to the control unit 23 by a switching operation or the like. The above control unit
In the initial stage 23, one of the open / close valves 4 and 8a is opened first to adjust the opening of the flow control valve 18, and the three-way switching valve is opened.
16, and pressurized gas (for example, pressurized air) generated by the operation of the compressor 12 is passed through the pipe 17 to the resin tank 1.
And the plunger 2 is operated to fill the filling cylinder 6 with the lining resin, and a resin group is formed therein. When the required filling amount calculated from the time and the adjustment value of the flow control valve is reached, the control unit 23 closes the open / close valve 4 and opens the open / close valve 8. 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 control valve 14, and
Press the resin group inside the existing piping A via the launcher 11.
The lining is performed on the inner surface of the tube with a film thickness corresponding to the flow speed of the resin. At this time, the open / close valve 8a is open, and the open / close valves 5, 9, 9a are closed. When the resin group has passed through the launcher 11, the open / close valves 5 and 9a are opened, and the resin in the resin tank 1
The filling cylinder 7 is filled with the pressurized air supplied through the pipe 17. When the 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) of the compressor 12 is supplied to the air tank 13. As described above, the supply control of the low-pressure gas (for example, low-pressure air) via the filling cylinder 6 is performed by the control unit 23 during and after the filling of the filling cylinder 7 with the resin. In this case, the calculation basis in the control unit 23 depends on the following formula. First, the amount of low-pressure gas flowing into the existing pipe A (diameter D)
Q1, since the relationship of the pressure P ₁ (e.g., 0.6 kg / cm ²⁾ if ^{π / 4 · D 2 · l} 1 · P 1 = Q 1 · P 0 ... (1), the resin group by the low-pressure gas By measuring Q ₁ , P ₀ , and P ₁ at the feed start time T ₁ , from equation (1), l ₁
You can know. Here, the amount Q _{1 of} gas flowing into the existing pipe A is defined as the measured values F ₁ and F ₂ of the flow meters 19 and 20.
Is obtained by the difference In this case, if a mass flow meter is used for the flow meters 19 and 20, there is no influence of the gas temperature, so that the calculation is easy. Here, 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 21 and 22, and D is the existing pipe A
Is the inner diameter of the lining. 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. Here, Δl = l ₂ −l ₁ Δt = T ₂ −T ₁ . Therefore, the predetermined time interval Δt is set by the clock of the oscillator in the control unit 23, and each time,
The flow rate regulating valves 14, 15 are measured so that the resin flow velocity V at each moment is maintained at a predetermined value by measuring the amount of gas flowing into the pipe from 19, 20 and the pressure from the pressure gauges 21, 22.
Is controlled. In the existing pipe A, the length of the resin group decreases because it is consumed for lining to the inner surface of the pipe, but since the flow velocity is constant, the pressure of the pressurized gas drops substantially linearly (third pipe).
See figure). As the resin of the resin group is consumed, the resin group leader gradually
At the same time, the pressure of the pressurizing gas for maintaining the resin flow velocity constant also decreases substantially linearly, and the resin group length becomes zero.
Then, the pressure of the pressurized gas also becomes the atmospheric pressure. When the resin group is consumed before the resin lining in the existing pipe A is completed, or when the resin group is led out into the receiver 24 at the other end of the existing pipe A and received in the receiver tank 25, the low-pressure gas is discharged from the pipe. And a sharp drop in pressure occurs. At this point, the control unit 23
Length l to the position where the resin lining has been completed, the amount of gas at the time Q, and the elapsed time t ₀ is stored in the memory, closing the on-off valve 8. Next, the opening and closing valves 9 and 9a are opened, and the resin group filled in the filling cylinder 7 is opened with a low-pressure gas.
Through the existing pipe A. Then, the on-off valve 4 is opened again, and the three-way switching valve 16 is switched, so that the compressor
Twelve pressurized air is supplied to the resin tank 1 via the pipe line 17, and the resin is filled in the filling cylinder 6. When filling is completed, open / close valve 4
Is closed, and the three-way switching valve 16 is switched to supply the compressed air of the compressor 12 to the air tank 13. Then, based on the result of the calculation, the control unit 23 feeds into the existing pipe A through the resin group launcher 11 in the filling cylinder 7, and at this time, the lining resin group is supplied to the existing pipe A which was previously lined. While moving through the inside at a predetermined speed V, the film thickness of the lining in the tube does not change, so that the pressure of the pressurized gas is maintained at a substantially constant value without reducing the length of the resin group. However, after the resin group reaches a position where the pipe A has not yet been lined, the resin is consumed by the lining, and the length of the resin group is reduced. Therefore, the lining is performed while the pressure of the pressurized gas gradually decreases. The progress is the same as described above. In this case the resin leader becomes substantially 0, the pressure of the pressure gas is atmospheric pressure again becomes substantially 2t ₀ elapsed time up to this time, also the length of the end position of the lining is substantially 2l. In this way, the lining length is successively extended while repeating the lining by filling and pressing the resin. When the lining of the existing pipe A is completed and the resin group reaches the open end with the length of the resin group still remaining, the resin group
And the flow resistance of the resin group in the pipe A sharply decreases, so that the pressing force controlled by the control unit 23 also sharply decreases to atmospheric pressure. Also, the elapsed time until the pressing force decreases to the atmospheric pressure is (n-1) t + t '(where t'<t) shorter than the expected (n.times.t) (third).
See figure). That is, it is determined that the resin group has reached the inside of the receiver 24 from the sudden decrease in the pressing force and the difference between the elapsed time and the estimated elapsed time, and the lining repair for the existing pipe A is terminated.

【The invention's effect】

The present invention has been described in detail above, and in the process of performing the lining in which the resin group of one of the filling cylinders is sent with a low-pressure gas into the existing pipe through the supply launcher, the other filling cylinder is filled with resin. Is filled, so that the resin group of this filling cylinder is alternately sent into the existing piping, so that the conventional waste time required for filling the launcher with the resin can be omitted, and the usable time can be effectively used for the lining work. .

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic configuration diagram showing one embodiment of the present invention, FIG. 2 is a schematic configuration diagram showing a state of lining repair of an existing pipe, and FIG. 3 is a repeated state of a resin lining. It is a time chart shown. 1 ... Resin tank, 2 ... Plunger, 3 ... Outlet passage, 4,5,8,8a, 9,9a ... Open / close valve, 10 ... Low-pressure gas supply device.

Claims (1)

(57) [Claims] 1. A low-pressure gas supply device which branches an outlet passage of a resin tank into two and communicates with each of the filling cylinders via an opening / closing valve, and one end of the filling cylinder via an opening / closing valve. And the other end of the above-mentioned filling cylinder is communicated with a supply launcher via an opening / closing valve, and while one of the filling cylinders is being filled with a resin for lining from a resin tank, the other filling cylinder is being filled. Is connected to the low-pressure gas supply device and the launcher, and the resin group in the filling cylinder is sent into the existing piping via the launcher, and the switching control of the open / close valve is performed so as to perform resin lining of the pipe inner surface. Continuous injection device for lining resin