JPH09291793A - Washing method of injection port member in shield construction method and device thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To wash a hardener feed passage or pipe line so as to prevent blockage due to hardner and smoothly inject succeeding hardener, after injecting hardener from a hardener injection port member mounted on the rear end of a shield machine to the drilled wall side so as to form a hardened layer. SOLUTION: A reciprocating piston 5b is arranged in a hardener injection passage 4 in a hardener injection port member 2, a hardener injection circuit communicating a hardener feed passage 7 to the hardener injection passage 4 side is formed by forward movement of the piston 5b so as to inject the hardener, and by backward movement of the piston 5b, it is changed to a washing circuit communicating a washing water feed passage 6 to the hardener feed passage 7 side so as to wash the inside of the passage by washing water. When washing is difficult by low pressure washing water, pressure oil for operating the piston 5b is forcedly fed to the washing water feed passage 6 side, the harener in the passage is pushed out by high pressure oil, and hence the inside of the passage is washed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield construction method for excavating a tunnel, after forming a hardener layer by supplying a hardener to a tunnel excavation wall surface from a hardener inlet port member attached to a rear end of a shield machine, The present invention relates to a method for cleaning and removing the hardening material remaining in the hardening material injection circuit when the supply of the hardening material to the tunnel excavation wall surface side is stopped, and an apparatus for carrying out the method.

[0002]

2. Description of the Related Art In the shield construction method, a pump installed on the vertical shaft feeds a hardening material such as mortar to the shield excavator side through a feed pipe installed inside the tunnel, and is installed along the tunnel excavation wall surface. A hardened layer that reinforces the excavated wall surface is formed between the segment or the mold and the excavated wall surface by pouring from a hardening material injection port member attached to the rear end of the shield excavator.

The hardening material injection port member has a hardening material injection passage opening rearward toward the tunnel excavation wall surface, a hardening material feeding passage and a cleaning water feeding passage which communicate with the front end side of the hardening material feeding passage. And a piston is disposed in the hardening material injection passage, and the reciprocating motion of the piston cuts off the communication between the cleaning water feeding passage and the hardening material feeding passage, Is connected to the injection passage side, and a cleaning circuit for closing the injection port of the curing material injection passage and communicating the cleaning water supply passage with the curing material supply passage is switched.

When the hardener is backfilled and injected into the excavated wall surface, the piston is moved forward to switch to the hardener injection circuit, and the pump is operated to cure the hardener through the hardener feed pipe arranged in the tunnel. By feeding the material to the hardening material feeding passage of the injection port member, the hardening material is injected from the filling passage to the tunnel excavation wall surface. After the injection of the hardening material and before the next injection work, if the hardening material remaining in the hardening material feeding passage and the pouring passage of the hardening material feeding port member and the filling pipe communicating with the hardening material feeding passage is hardened. Since it is difficult to feed the hardened material, it is necessary to clean the inside of the passage and the inside of the pipe.

When performing this cleaning, the piston is moved back to switch to the cleaning circuit side, and the cleaning water is pressure-fed to the cleaning water supply passage of the hardening material inlet member through the cleaning water supply pipe arranged in the tunnel. Then, the hardening material supply passage is circulated in a direction opposite to that at the time of supplying the hardening material to clean the inside of the supply passage and the hardening material supply pipe.

[0006]

However, if the timing is delayed when the cleaning process is performed after the injection of the hardening material, the hardening material remaining in the hardening material feeding passage and the feeding pipe of the injection port member is hardened. When the inside of the passage or pipe is closed for the first time, the cleaning water is sent by switching to the cleaning circuit to wash and remove the hardened material. It becomes impossible to remove the hardened material by circulating it in the passage or the pipe. Furthermore, the phenomenon of blockage of the hardened material in the pipeline is that when the hardened material is gradually injected during low-speed operation of the shield machine, the hardened material flows through the center of the pipeline and the hardened material stagnates on the pipe wall side. This occurs also in the case where the stagnant hardening material is accumulated, and the stagnant hardening material is accumulated to block the pipeline. As described above, it is impossible to wash and remove the hardening material by feeding the washing water.

Further, in order that the hardening material injected from the hardening material injection port member to the tunnel excavation wall surface may be hardened in a short time so that the work of constructing the hardened layer can be performed efficiently, the hardening material is sent just before the hardening material is sent to the injection port member. The quick-setting material is supplied into the feed pipe, but in this case, after the hardening material is injected, the hardening material in the passage and the conduit starts to cure in a short time of about 10 seconds. Blockages in passages and pipes are more likely to occur, and even if the cleaning work with cleaning water is performed quickly, cleaning of the hardened material,
In some cases, the removal may not be performed sufficiently.

The present invention has been made in view of the above problems, and when the inside of the hardening material passage cannot be washed with washing water, pressure oil is supplied to clean the inlet member in the shield construction method. A method and an apparatus for performing the method are provided.

[0009]

A method for cleaning an injection port member in a shield construction method according to the present invention has a structure which is mounted on a rear end of a shield machine and switches between a hardening material injection circuit and a cleaning circuit by reciprocal movement of a piston. A method of cleaning a pouring member, injecting the curing material by switching to a cleaning circuit that sends low-pressure cleaning water after injecting the curing material and circulating the cleaning water in the curing material injection circuit in a direction opposite to that when the curing material is injected. The inside of the circuit is washed, and when it cannot be washed with washing water, high pressure oil is supplied to the washing circuit from the piston driving hydraulic circuit side to wash with the high pressure oil.

Further, as a cleaning device for carrying out the above method, as described in claim 2, the inlet member attached to the rear end of the shield machine is hardened by opening rearward toward the tunnel excavation wall surface. A material injection passage, a hardening material feeding passage communicating with the front end side of the hardening material feeding passage, and a cleaning water feeding passage for feeding low-pressure washing water are provided, and a high pressure hydraulic pressure is applied to the hardening material feeding passage. A reciprocating piston is provided, and the forward movement of the piston causes the hardening material feed passage to communicate with the hardening material injection passage side to form a hardening material injection circuit. The cleaning water supply passage is configured to communicate with the hardener supply passage side to form a cleaning circuit. Further, the hydraulic circuit for driving the piston is connected to the cleaning water of the inlet member via a switching valve. Connected to the feeding passage Wash water feed passage connected to the supply pipe feeding washing water to those that are supplied configured to be capable of high-pressure oil.

[0011]

When the hardener is injected between the tunnel wall excavated by the shield machine and the segment or the mold to form the hardened layer, the hardener is disposed in the injection passage of the hardener injection port member. After moving the piston forward to switch to the hardening material injection circuit, press the hardening material into the hardening material feed passage provided in the hardening material injection member by pump drive through the hardening material feed pipe installed in the tunnel. Then, the hardening material is back-filled and injected into the tunnel excavation wall surface from the hardening material injection passage through the feeding passage.

Next, when the step of injecting the hardening material is completed, the piston is moved back to switch to the cleaning circuit,
The process moves to the step of removing the hardened material remaining in the passage. In this elimination step, the cleaning water is pumped through a cleaning water supply pipe provided in the tunnel into the cleaning water supply passage provided in the curing material injection port member, and the curing material is injected from the supply passage. It is performed by circulating the hardened material through the passage to the side of the hardened material feeding passage.

Further, when it takes a long time from the injection of the curing material to the start of cleaning, or when the curing speed of the quick-setting material mixed with the curing material is high, the curing material is cured in the passage to wash water. At the supply pressure of 2, the situation that cleaning and removal cannot occur occurs.
In this case, high pressure oil is fed into the cleaning water supply pipe from the driving hydraulic circuit side of the piston in a state where the piston is moved back to the cleaning circuit side as described above, and the hardening material is supplied from the cleaning water supply pipe. Through the cleaning water feed passage of the inlet member, the hard material is pressure-fed to the hard material feed passage by the high hydraulic pressure, and the hard material in the passage is pushed to the hard material feed pipe side, and the inside of the feed pipe is in the opposite direction to the hard material feed direction It is discharged to the outside of the pipeline after being made to flow.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, specific embodiments of the present invention will be described with reference to the drawings. In FIG. 1, 1 is a cutter plate
This is a shield machine for excavating the tunnel T by propelling 1a while rotating it, and an injection port member 2 is fixed to the rear end of the skin plate 1b. This inlet member 2
2 to 5, a Viston chamber 3 and a hardening material injection passage 4 are bored on the same center line across the front and rear end faces in the center portion in the width direction, and the piston chamber 3 is provided with an injection port. Member 2
Of the injection passage 4 is provided in the front half portion side of the tunnel passage and the rear end opening of the injection passage 4 is a gap between the tunnel excavation wall surface t and a segment or formwork (hereinafter, referred to as segment S). To face. Also, the piston chamber 3
A partition wall 3a in which a rod body 5 having a fixed length is slidably inserted is provided in a continuous portion of the injection passage 4 and the injection passage 4. A first piston 5a that slides back and forth in the piston chamber 3 is fixed to the front end of the rod body 5, and a second piston 5b that slides back and forth in the injection passage 4 is fixed to the rear end. There is.

Further, a cleaning water supply passage 6 communicating with the injection passage 4 is provided at one side of the injection port member 2 on the front end side of the injection passage 4, and the cleaning water supply passage 6 is provided.
On the other side of the injection port member 2 in the front portion of the injection passage 4, a hardening material feeding passage 7 communicating with the middle portion of the injection passage 4 is provided. Then, when the rod body 5 is moved forward to position the second piston 5b from the hardening material feeding passage 7 in the front end portion of the injection passage on the front side, the cleaning water feeding passage 6
And the hardening material feed passage 7 are cut off to form a hardening material injection circuit in which the hardening material feed passage 7 is connected to the injection passage 4 side, and the rod body 5 is moved back to move the second piston 5b. Is located on the front end opening side of the curing material injection passage 4, a cleaning circuit is formed by connecting the cleaning water supply passage 6 from the curing material injection passage 4 to the curing material supply passage 7 side. ing.

The rod body 5 having the first and second pistons 5a and 5b is reciprocated back and forth by a piston driving hydraulic circuit installed at a proper position inside the shield machine 1 outside the hardening material inlet member 2 or inside the tunnel T. Be moved. As shown in FIG. 1, the piston driving hydraulic circuit includes a piston forward pressure oil supply pipe 8a and a piston backward movement pressure oil supply pipe 8b which communicate with a hydraulic pump of a hydraulic unit 8 as a hydraulic pressure supply source. These supply pipes 8a and 8b are connected and communicated with the front and rear chambers of the hardening material injection port member 2 in the piston chamber 3 with the first piston 5a interposed therebetween.

On the other hand, a hardening material tank containing a water tank 11 and a hardening material M such as mortar on the shaft side of the tunnel T at the start of excavation or outside the shaft, that is, on the shaft side of the shield machine 1.
12 are installed, and the rear ends of the cleaning water feed pipe 9 and the hardening material feed pipe 10 are connected and communicated with the water tank 11 and the hardening material tank 12, respectively. Through the tunnel T, the cleaning water feed passage 6 and the hardening material feed passage 7 provided in the hardening material injection port member 2 attached to the rear end of the shield machine 1 are connected and communicated with each other.

Further, on the side of the shield machine 1, the washing water feed passage 6 and the intermediate portion of the piston return pressure oil supply pipe 8b in the hydraulic circuit are connected by a connecting pipe 15 provided with a switching valve 13 and a check valve 14. This connecting pipe 15 is connected and communicated
An opening / closing valve 16 is provided at an appropriate position on the piston return pressure oil supply pipe 8b from the inlet to the hydraulic port of the inlet member 2, and an opening / closing valve 17 is provided on the flush water supply pipe 9 until reaching the connection pipe 15. It is provided.

In the line of the hardening material feed pipe 10,
A first valve 18 is provided in the vicinity of the injection port member 2 and the shield machine 1 on the rear side of the first valve 18 is provided.
An electromagnetic densitometer 19 connected to a controller for transmitting a signal for opening and closing each valve described later is provided in the line of the feed pipe 10 in the tunnel T in the vicinity thereof, and further, in front of the densitometer 19. Separator 20 in the line of hardening material feed pipe 10
The separator 20 divides the feed pipe 10 into a feed pipe 10 side communicating with the shield machine 1 side and a first branch pipe 22 side communicating with a recovery pipe 21 side described later. The first branch pipe 22 is provided with a third valve 23.

A second valve 24 is provided at an appropriate position of the hardening material feed pipe 10 leading from the separator 20 to the shield machine 1 side, and a second branch pipe 22 'leading to a recovery pipe 21 described later is connected and communicated. At the same time, fourth and fifth valves 25, 26 are provided at the front and rear sides of the feed pipe 10 sandwiching the second branch pipe 22 '. The recovery pipe 21 connecting and communicating these first and second branch pipes 22 and 22 'communicates through a vacuum tank 39 to a vacuum pump 38 installed in the vertical shaft through the tunnel T or on the vertical shaft side such as the ground. are doing. In addition, the feed pipe 10 from the separator 20 to the shield machine 1
And the diameter of the second branch pipe 22 'is smaller than the diameter of the feed pipe 10 up to the separator 20, so that the hardening material flowing through the feed pipe 10 increases the flow velocity at the separator 20. There is. First branch pipe
The diameter of 22 is equal to the diameter of the feed pipe 10 to the separator 20,
A plug body (not shown), which will be described later, flowing down 10 passes through. Further, the recovery pipe 21 has a diameter larger than that of the feed pipe 10 up to the separator 20, and the front end thereof is provided with an inflow port through which the atmosphere flows.

On the other hand, the hardening material feed pipe 10 provided in the tunnel T is connected to the discharge side of the first pump 27 installed in the shaft or on the ground via the sixth valve 28 on the shaft side. At the same time, this pump 27
Through a feed pipe section having a seventh valve 29. Further, the feed pipe 10 between the pump 27 and the seventh valve 29
One end of a connecting pipe 31 having an eighth valve 30 is connected to the portion,
The connection pipe 31 communicates with the water tank 11 at the other end.

Further, both ends of a bypass pipe 34 having a ninth valve 32 and a tenth valve 33 are connected to the portion of the supply pipe 10 on both sides of the sixth valve 28, and the ninth and tenth valves are connected.
An insertion pipe 36 of a plug having an eleventh valve 35 is connected and communicated with a bypass pipe portion between the valves 32 and 33. Further, the cleaning water supply pipe 9 is arranged in the tunnel T via the second pump 37, and the front end thereof is connected to and communicates with the cleaning water supply passage 6 of the injection port member 2 of the shield machine 1. There is.

Reference numeral 40 communicates with the line of the feed pipe 10 between the first valve 18 and the fourth valve 25 provided in the hardening material feed pipe 10 in the vicinity of the injection port member 2 on the shield machine 1 side. With the mixer installed and arranged in this state, the check valve 41 is added to the mixer 40.
The quick-setting material supply pipe 42 having the above is connected and communicated, and the quick-setting material for hardening the hardening material in a short time is supplied from the supply pipe 42 to the hardening material flowing in the mixer 40 through the check valve 41. Is configured as follows.

The formation of a hardened layer on the wall surface of the tunnel excavation by using the hardener supply pipe line and the wash water supply pipe line configured as described above, and the method of removing the hardener in the pipe and cleaning the inside of the pipe will be described. . First, as is well known, excavation of a tunnel by the shield machine 1 is performed while rotating the cutter plate 1a, and the segment S is assembled on the rear side according to excavation of the tunnel of a certain length.

In order to inject a hardening material such as mortar into the gap between the segment S and the tunnel excavation wall surface t as a backfill material, first, the hydraulic unit 8 of the hydraulic circuit is operated to move the piston forward pressure. Hardened material in which pressure oil is supplied to the oil supply pipe 8a, the rod body 5 in the injection port member 2 is moved forward, and the hardening material feed passage 7 is communicated with the injection passage 4 side as shown in FIG. Switch to the injection circuit. The on-off valve 16 in the hydraulic circuit is opened and the switching valve 13 in the connecting pipe 15 is closed. Further, the first and second branch pipes 22 and 22 'of the recovery pipe 21
Second and third valves 23 and 24 provided in the
An eighth valve 30 provided on a connecting pipe 31 between the water tank 10 and the water tank 11,
After the ninth and tenth valves 32 and 33 provided on the bypass pipe 34 side are closed and the other valves are opened, the first pump 27 is operated to cure the hardening material tank 12. The material M is pumped by the pump 27 to the feed pipe 10, and the separator 20
Through the mixer 40 from the hardener feed passage 7 of the inlet member 2
To a certain amount from the injection passage 4, and is injected into the void portion,
Will be filled.

At this time, when the hardener passes through the mixer 40, it is mixed with the quick-setting material supplied to the mixer 40 through the quick-setting material supply pipe 42 in the mixer 40, and then the injection port is added as described above. A hardening material layer that is fed to the injection passage 4 side of the member 2 and injected into the gap between the segment S and the tunnel excavation wall surface t, and then hardens in a short time and integrally adheres to the segment S and the tunnel excavation wall surface t. Form M.

When a mold is used in place of the segment S, the hardening material injected into the space between the mold and the wall surface of the tunnel excavation reaches a certain strength, and the mold is moved forward and backward until it hardens. To reciprocate. This reciprocating motion is shield machine 1
It can be done by a jack connected to the form on the side.

After the hardening material injected and filled into the void is hardened, a shield machine 1 is used to excavate a tunnel of a certain length again. The tunnel of a certain length is excavated after the injection of the hardening material into the void is completed. Then, while performing the next hardening material injection work, or while the shield machine 1 is stopped due to a failure of a device such as a shield machine, the hardening material injection passage 4 in the injection port member 2
The hardener remains in the hardened material feed passage 7 and the hardened material feed pipe 10, and the hardened material adheres to the injection passage 4, the feed passage 7, the hardened material feed pipe 10, etc. and hardens. This hinders the injection, so after the completion of the injection of the hardening material into the void, the residual hardening material is washed and removed with washing water.

The removal method is as follows: First, in the pipe line between the hardening material feed passage 7 in the injection port member 2 and the mixer 40 in which the hardening material whose hardening speed is accelerated by the mixing of the quick-setting material remains. After cleaning, the inside of the hardening material supply pipe 10 in which the quick-setting material is not mixed is cleaned. The cleaning of the hardening material supply passage 7 side is performed by opening the first valve 18, the fourth valve 25, and the second valve 24 and closing the third valve 23 and the fifth valve 26, and at the same time, the hydraulic pressure of the hydraulic circuit. The unit 8 is actuated to supply pressure oil to the piston return pressure oil supply pipe 8b, and the rod body 5 in the injection port member 2 is moved backward to move the hardening material feed passage 7 as shown in FIG. The washing circuit is connected to the washing water supply passage 6. In this case as well, the open / close valve 16 in the hydraulic circuit is opened and the switching valve 13 in the connecting pipe 15 is closed.

When the second pump 37 is operated in this state,
The cleaning water from the water tank 11 flows through the supply pipe 9 from the cleaning water supply passage 6 of the injection port member 2 to the hardener supply passage 7 through the hardener injection passage 4, and is further cured from the hardener supply passage 7. The second branch pipe 2 in which the fourth valve 25 to the second valve 24 are provided through the mixer 40 in the pipe line on the tip side of the material feeding pipe 10.
The hardener that flows through 2'and remains in the pipeline between them is extruded by the wash water toward the recovery pipe 21 and washed. At this time, if the vacuum pump 38 installed on the vertical shaft side is operated, the hardened material extruded to the recovery pipe 21 side can be promptly removed to the vertical shaft side. The above second pump
37 is a high-pressure turbine pump, which can be washed by pumping wash water with a water pressure of 10 to ²⁰ Kgf / cm ² =.

Next, if it takes a long time from the injection of the curing material to the start of cleaning, particularly in the curing material feeding pipe for mixing the quick-setting material with the curing material or the curing material injection passage 4 of the injection port member 2. In addition, the hardening material hardens in the hardening material supply passage 7, and the hardening material cannot be washed and removed even by the pressure of the washing water by the high-pressure pump as described above. Such a situation occurs even when the shield machine 1 is operated at a low speed with a low excavation speed. That is, since the injection amount of the hardening material decreases at low speed operation, the so-called piping phenomenon occurs in which the hardening material mixed with the quick-setting material stagnates in the outer peripheral portion of the feeding pipeline or passage and flows in the central portion. However, the hardening material that does not flow adheres to and accumulates on the inner wall of the passage, which is a tube wall, and eventually closes.

Therefore, when the above-mentioned situation in which the cleaning water cannot be washed and removed by the supply pressure of the cleaning water as described above occurs, as described below, the hydraulic pressure higher than the pressure of the cleaning water (210 Kgf / cm ² ). Is used to clean and remove the hardened material in the feeding pipelines and passages. That is, the on-off valve in the hydraulic circuit
While closing the valve 16, the switching valve 13 in the connecting pipe 15 is opened, and the on-off valve 17 in the cleaning water supply passage 6 is closed, and the hardening material supply passage 7 and the cleaning water supply passage are connected as described above. When the high pressure oil is pressure-fed from the hydraulic unit 8 to the piston return pressure oil supply pipe 8b in the state where the cleaning circuit is connected to the supply passage 6, the pressure oil is transferred from the connection pipe 15 to the cleaning water supply pipe 9. Inflowing from the cleaning water supply pipe 9 to the cleaning water supply passage 6 of the inlet member 2.
After being pressure-fed in, it flows into the hardening material feeding passage 7 through the hardening material injection passage 4, and further from this hardening material feeding passage 7 through the mixer 40 in the conduit on the tip side of the hardening material feeding pipe 10. Second branch pipe 2 provided with fourth valve 25 to second valve 24
The hardener injection passage 4 and the hardener feed passage 7 that flow in the 2 '
The hardened material remaining in the hardened material feeding pipe line between the inside and the second branch pipe 22 'is pushed out to the recovery pipe 21 side by pressure oil to be washed and removed.

Next, in the curing material supply pipe 10 until the quick-setting material is mixed, the curing material remaining in the curing material supply pipe 10 is removed and the inside of the supply pipe 10 is cleaned. First, after inserting the plug (not shown) into the bypass pipe portion between the ninth valve 32 and the tenth valve 33 through the eleventh valve 35 in the plug insertion pipe 36 communicating with the bypass pipe 34, 11th valve
The valve 35 is kept closed and the fifth valve 26 provided on the hardening material supply pipe 10 on the tunnel T side, the sixth valve 28 provided between the bypass pipes 34, and the seventh valve 29 on the hardening material layer side.
Closed, the third valve 23, the eighth to tenth valves 30, 32, 33
When the first pump 27 is actuated in the open state, cleaning water is supplied from the water tank 11 to the hardening material supply pipe 10 through the connecting pipe 31.

This wash water is forced to flow into the bypass pipe 34 from the tenth valve 33 side, the back surface of the plug is pressed by the water pressure, and the plug enters the hardening material feed pipe 10 through the ninth valve 32. While sliding in the feed pipe 10, it moves forward to push the hardened material remaining in the feed pipe 10 to flow out to the first branch pipe 22 provided with the third valve 23, and then to the recovery pipe 21. Is removed to the vertical shaft side. During this time, when the plug passed through the electromagnetic densitometer 19 disposed in the hardening material feed pipe 10 in the tunnel T, the densitometer 19 changed the inside of the feeding pipe 10 from the hardening material to the cleaning water. To be detected.

When it is detected by the densitometer 19 that the hardened material is changed to washing water, a signal sent from the densitometer 19 immediately causes the second valve to pass through the controller.
By opening the valve 24 and the fifth valve 26 and closing the third valve 23, the washing water flows from the separator 27 to the second branch pipe 22 '.
And the hardened material therein is automatically discharged to the recovery pipe 21. At this time, the plug faces the plug receiving port of the separator 20. After that, when the fifth valve 26 is closed and the third valve 23 is opened, the residual hardened material together with the plug is completely and automatically discharged from the first branch pipe 22. At this time, since the diameters of the feed pipe 10 and the second branch pipe 22 'on the front side from the separator 20 are made small, the flow rate of the washing water is increased, and the residual hardened material is completely washed without the plug body. can do.

Incidentally, the discharge of the hardening material in the first branch pipe 22 is
When it is detected by the densitometer 19 that the hardened material has changed to cleaning water, the stopper will be replaced by the first branch pipe after a while.
Since it is discharged into the recovery pipe 21 from 22, the residual hardened material in the second branch pipe 22 ′ may be washed thereafter. When the residual hardener and the plug are discharged into the recovery pipe 21, the vacuum pump 38 that has been operated in advance captures the residual hardened material and the plug through the recovery pipe 21 into the vacuum tank 29 on the vertical shaft side, and retains and removes them.

In order to clean the inside of the sixth valve 28 provided in the feed pipe 10 between the bypass pipes 34, the plug body is fed to the feed pipe 10 side, and then the ninth valve in the bypass pipe 34, 10th valve
This is done by closing 32 and 33 and opening the sixth valve 28. Further, when the inside of the injection member 2 is cleaned by using the cleaning water supply pipe 9 described above without providing the second branch pipe 22 'and the second valve 24, the third valve 23 is opened and the sixth valve is opened. By closing 28, the hardening material in the feed pipe 10 in front of the separator 20 may be passed through the first branch pipe 22 to be washed.

The plug reaching the separator 20 enters the branch pipe 22 as in the above embodiment, while the hardening material flows from the feeding pipe 10 through the passage in the hardening material inlet member 2 as described above. Recovery pipe
Spill to 21. At this time, by operating the vacuum pump 38 together with the first pump 27, the hardened material can be smoothly removed to the vertical shaft side through the inside of the recovery pipe 21. A densitometer
Detection when the elimination of the hardened material is completed by 19, and
The automatic switching of each valve by the electric signal from the densitometer 19 is the same as in the above embodiment. Further, the stopper can be used not only when the hardened material in the pipe is removed by the wash water as described above, but also when the hardened material is fed again into the feed pipe 10 filled with the wash water. . Also at that time, the stopper passes through the densitometer 19 and enters the first branch pipe 22, and when the densitometer 19 detects that the washing water is changed to the hardened material, the hardened material flows toward the inlet member 2. Operate the valve.
Thus, the concentration meter 19 can identify the substance flowing in the tube, and the signal can automatically operate the valve.

[0039]

As described above, according to the present invention, the injection port is attached to the rear end of the shield machine and has a structure for switching between the hardening material injection circuit and the cleaning circuit for sending low-pressure cleaning water by the reciprocating motion of the piston. When cleaning the material, switch to the cleaning circuit after injecting the hardening material and let the washing water flow in the hardening material injecting circuit in the direction opposite to the direction in which the hardening material is injected to wash the inside of the hardening material injecting circuit. When cleaning cannot be performed, high-pressure oil is supplied from the piston driving hydraulic circuit side to the cleaning circuit to perform cleaning with the pressure oil.Therefore, a hydraulic circuit for operating the piston that switches between the hardening material injection circuit and the cleaning circuit is used. The hardened material remaining in the hardened material injection passage or the hardened material feeding passage in the inlet member, which is difficult to clean and remove with washing water, is pushed out to the hardened material feeding pipeline side by the pressure oil having a pressure higher than that of the washing water. This It can be, which the curing material passage inlet in member can wash easily and efficiently, therefore,
It is possible to improve the workability of tunnel construction by reliably and sequentially injecting the hardened material into the tunnel excavation wall surface while reliably preventing the hardened material from being blocked by the hardened material in the hardened material feeding passage or pipe. Is.

[Brief description of drawings]

[Figure 1] Piping diagram from the shaft to the shield machine,

FIG. 2 is a vertical sectional side view of an injection port member attached to the rear end of the shield machine,

FIG. 3 is a vertical sectional front view thereof,

FIG. 4 is a cross sectional view thereof,

FIG. 5 is a cross-sectional view showing a state in which a hardening material passage and a washing water passage are communicated with each other.

[Explanation of symbols]

 1 shield machine 2 inlet member 4 hardening material injection passage 5a, 5b piston 6 cleaning water feeding passage 7 hardening material feeding passage 8 hydraulic unit 8a, 8b pressure oil supply pipe 9 washing water feeding pipe 10 hardening material feeding pipe

Claims (2)

[Claims] 1. A method of cleaning an injection port member, which is mounted on a rear end of a shield machine and has a structure for switching between a hardening material injection circuit and a cleaning circuit by reciprocating movement of a piston, wherein low pressure cleaning water is used after the hardening material is injected. The cleaning circuit is sent to the hardener injection circuit to wash the hardener injection circuit by circulating it in the opposite direction to the hardener injection circuit. A method for cleaning an injection port member in a shield construction method, comprising: supplying high-pressure oil from a side to a cleaning circuit to perform cleaning with the high-pressure oil. 2. An injection port member attached to a rear end of the shield machine is a hardening material injection passage opening rearward toward a wall surface for excavating a tunnel, and a hardening material feed passage communicating with a front end side of the hardening material injection passage. And a cleaning water supply passage for supplying low-pressure cleaning water, and a piston that reciprocates by high-pressure hydraulic pressure is arranged in the hardening material injection passage, and the hardening material is moved forward by the piston. The feeding passage is communicated with the hardening material injection passage side to form a hardening material injection circuit, while the return movement of the piston causes the cleaning water feeding passage to communicate with the hardening material feeding passage side to form a washing circuit. Further, the hydraulic circuit for driving the piston is connected to a cleaning water supply pipe communicating with the cleaning water supply passage of the inlet member via a switching valve to connect the cleaning water supply passage to the cleaning water supply passage. High pressure oil can be supplied A cleaning device for an inlet member in a shield construction method, which is characterized in that