JP3253855B2 - Method and apparatus for cleaning inlet member in shield method - Google Patents

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. In the shield construction method, a hardened material is supplied to a tunnel excavation wall surface from a hardened material inlet member mounted on a rear end of a shield machine to form a hardened material layer. The present invention relates to a method for cleaning and removing hardening material remaining in a hardening material injection circuit when supply of hardening material to a tunnel excavation wall surface is stopped, and an apparatus for performing the method.

[0002]

2. Description of the Related Art In the shield method, a hardening material such as mortar is supplied to a shield excavator through a feed pipe provided in a tunnel by a pump disposed on a shaft, and is disposed along a tunnel excavation wall. A hardened layer for reinforcing the excavation wall is formed by injecting a hardened material injection port member attached to the rear end of the shield excavator between the segment or the formwork and the excavated wall.

The hardening material inlet member includes a hardening material injection passage opening rearward toward the tunnel excavation wall surface, a hardening material supply passage communicating with a front end side of the hardening material injection passage, and a washing water supply passage. And a piston is disposed in the hardening material injection passage, and the reciprocating movement of the piston cuts off the communication between the washing water supply passage and the hardening material supply passage, thereby causing the hardening material supply passage. And a cleaning circuit for closing the injection port of the hardening material injection passage and communicating the washing water supply passage with the hardening material supply passage.

When the hardening material is back-filled into the excavation wall, the piston is moved forward to switch to a hardening material injection circuit, and the hardening material is hardened through a hardening material supply pipe disposed in the tunnel by operating a pump. By supplying the material to the hardening material supply passage of the inlet member, the hardening material is injected from the injection passage into the tunnel excavation wall surface. After the injection of the hardening material, before the next injection operation, when the hardening material remaining in the hardening material supply passage and the hardening material supply passage of the hardening material injection member and the injection pipe communicating with the hardening material supply passage is hardened. Since it becomes difficult to feed the hardening 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 backward to switch to the cleaning circuit side, and the cleaning water is pressure-fed into the cleaning water supply passage of the hardening material inlet member through the cleaning water supply pipe provided in the tunnel. Then, the hardening material supply passage is circulated in a direction opposite to the direction in which the hardening material is supplied to clean the supply passage and the hardening material supply pipe.

[0006]

However, after the injection of the hardening material, if the timing is shifted to the cleaning step, the hardening material remaining in the hardening material feeding passage or the feeding pipe of the inlet member hardens. When the passages and pipes are closed for the first time, and the cleaning circuit is switched to the cleaning circuit and the cleaning water is supplied to clean and remove the hardening material, the cleaning water is supplied at the normal cleaning water supply pressure. It becomes impossible to remove the hardening material by flowing through the passage or the pipe. Furthermore, when the hardening material is gradually injected during the low speed operation of the shield machine, the hardening material flows through the center of the pipeline and the hardening material stagnates on the pipe wall side during the low speed operation of the shield machine. This also occurs in a state where the stagnation hardening material is accumulated and blocks the pipeline, and as described above, the hardening material cannot be washed and removed by supplying the cleaning water.

[0007] In addition, the hardened material injected into the tunnel excavation wall from the hardened material injection port member is hardened in a short time so that the hardened material can be efficiently worked on the hardened layer immediately before the hardened material is fed into the injection port member. It is performed to supply the quick-setting material into the feed pipe, but in this case, after the injection of the hardening material, the hardening material in the passage or the pipe starts hardening in a short time of about 10 seconds and the above-mentioned Blockage in passages and pipes is more likely to occur.
In some cases, the removal is not performed sufficiently.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has been made in consideration of the above-described problems. A method and an apparatus for performing the method are provided.

[0009]

According to the present invention, there is provided a method of cleaning an injection port member in a shield method, comprising 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 reciprocation of a piston. This is a method for cleaning the injection port member. Injecting the hardening material by switching to the cleaning circuit that sends low-pressure cleaning water after the hardening material is injected and flowing the cleaning water into the hardening material injection circuit in the opposite direction to the time of the hardening material injection. The inside of the circuit is washed, and high pressure oil is supplied to the washing circuit from the piston driving hydraulic circuit side when the washing cannot be performed with the washing water, and the washing is performed with the high pressure oil.

[0010] Further, as a cleaning apparatus for carrying out the above method, as set forth in claim 2, the injection port member mounted on the rear end of the shield machine has a hardening opening to the rear toward the tunnel excavation wall surface. A hardening material supply passage, a hardening material supply passage communicating with a front end side of the hardening material injection passage, and a washing water supply passage for sending low-pressure washing water, and a high-pressure oil pressure in the hardening material injection passage. A reciprocating piston is provided, and the hardening material supply passage is communicated with the hardening material injection passage side by forward movement of the piston to form a hardening material injection circuit. The washing water supply passage is configured to communicate with the hardening material supply passage side to form a washing circuit, and the hydraulic circuit for driving the piston is connected to the washing water of the inlet member through a switching valve. Connected to the feed 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 a hardened layer is formed by injecting a hardened material between a tunnel wall excavated by a shield machine and a segment or a formwork, the hardened material is disposed in an injection passage of a hardened material injection member. After moving the piston forward and switching to the hardener injection circuit, the hardener is pressed into the hardener feed passage provided in the hardener inlet by the pump drive through the hardener feed pipe installed in the tunnel. Then, the hardening material is injected back into the tunnel excavation wall from the hardening material injection passage through the supply passage.

Next, when the hardening material injection step is completed, the piston is moved backward to switch to the cleaning circuit,
The process proceeds to a step of removing the hardened material remaining in the passage. In this removing step, the cleaning water is pumped through a cleaning water supply pipe provided in the tunnel by a pump into a cleaning water supply passage provided in the hardening material inlet member, and the hardening material is injected from the supply passage. This is performed by circulating through the passage to the hardening material supply passage side.

If a long time is required from the injection of the hardening material to the start of cleaning, or if the hardening speed of the quick-setting material mixed with the hardening material is high, the hardening material hardens in the passage and the washing water is used. A situation occurs in which cleaning and removal cannot be performed with a supply pressure of 1.
In this case, high pressure oil is fed from the hydraulic circuit side for driving the piston into the cleaning water supply pipe in a state where the piston is switched to the cleaning circuit side by the backward movement of the piston as described above, and the hardening material is supplied from the cleaning water supply pipe. The hardening material in the passage is pushed out to the hardening material supply pipe side by the high oil pressure by pressure feeding to the hardening material injection passage through the washing water supply passage of the inlet member, and the inside of the supply pipe is in the opposite direction to the hardening material supply direction. And discharged outside the pipeline.

[0014]

DETAILED 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.
A shield machine for excavating a tunnel T by propelling while rotating a 1a. An inlet member 2 is fixed to a rear end portion of a skin plate 1b. This inlet member 2
As shown in FIG. 2 to FIG. 5, a piston chamber 3 and a hardening material injection passage 4 are formed on the same center line between the front and rear end faces at the center in the width direction, and the piston chamber 3 has an injection port. Member 2
The injection passages 4 are provided on the rear half side, respectively, so that 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, described as a segment S). It is facing. Also, the piston chamber 3
A partition wall 3a through which a rod body 5 having a fixed length is slidably inserted is provided at a portion where the rod body 5 and the injection passage 4 are connected. 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. I have.

Further, a washing water supply passage 6 communicating with the injection passage 4 is provided on one side of the inlet member 2 at the front end side of the injection passage 4, and the washing water supply passage 6 is provided.
On the other side of the injection port member 2 in a portion near the front of the injection passage 4, a hardening material supply passage 7 communicating with an intermediate portion of the injection passage 4 is provided. When the rod 5 is moved forward to position the second piston 5b in the front end of the injection passage on the front side from the hardened material supply passage 7, the washing water supply passage 6
And the hardening material supply passage 7 is cut off to form a hardening material injection circuit in which the hardening material supply passage 7 communicates with the injection passage 4 side. When the cleaning water supply passage 6 is located on the front end opening side of the hardening material injection passage 4, the cleaning water supply passage 6 communicates with the hardening material injection passage 4 to the hardening material supply passage 7. ing.

The rod body 5 having the first and second pistons 5a and 5b is reciprocated back and forth by a hydraulic circuit for driving a piston installed in an appropriate place in the shield machine 1 outside the hardening material inlet member 2 or in the tunnel T. Be moved. As shown in FIG. 1, the piston drive hydraulic circuit includes a piston forward movement hydraulic oil supply pipe 8a and a piston return movement hydraulic oil supply pipe 8b which communicate with a hydraulic pump of a hydraulic unit 8, which is a hydraulic supply source. These supply pipes 8a and 8b are connected to and communicate with the front and rear chambers of the hardening material inlet member 2 in the piston chamber 3 with the first piston 5a interposed therebetween.

On the other hand, a hardened material tank in which a water tank 11 and a hardened material M such as mortar are accommodated in the shaft or the ground outside the excavation start side of the tunnel T, that is, on the shaft side with respect to the shield machine 1.
A washing water supply pipe 9 and a rear end of a hardening material supply pipe 10 are connected to and connected to the water tank 11 and the hardening material tank 12, respectively. The washing water supply passage 6 and the hardening material supply passage 7 provided in the hardening material inlet member 2 mounted on the rear end of the shield machine 1 are connected to and communicate with each other through the tunnel T.

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

In the line of the hardening material supply pipe 10,
A first valve 18 is provided in the vicinity of the inlet member 2 and a shield machine 1 at the rear side of the first valve 18.
An electromagnetic densitometer 19 connected to a controller that transmits a signal for opening and closing each valve, which will be described later, is provided in the line of the feed pipe 10 in the tunnel T in the vicinity of the concentrator 19. Separator 20 in the line of hardened material feed pipe 10
The separator 20 branches the feed pipe 10 into a feed pipe 10 that leads to the shield machine 1 and a first branch pipe 22 that leads to a collecting pipe 21 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 supply pipe 10 communicating from the separator 20 to the shield machine 1 side, and a second branch pipe 22 'communicating with a recovery pipe 21 described later is connected and communicated. In addition, fourth and fifth valves 25 and 26 are provided in the feed pipe 10 on both the front and rear sides of the second branch pipe 22 '. The collection pipe 21 connecting and communicating the first and second branch pipes 22 and 22 ′ is connected through a tunnel T to a vacuum pump 38 installed in a shaft or on the shaft or the like on the ground through a vacuum tank 39. are doing. The feed pipe 10 from the separator 20 to the shield machine 1
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 boundary of the separator 20. I have. 1st branch pipe
The diameter of 22 is equal to the diameter of the feed pipe 10 up to the separator 20 and the feed pipe
A plug (not shown), which flows down 10 and will be described later, passes through. Further, the recovery pipe 21 has a larger diameter than the feed pipe 10 up to the separator 20, and has a front end provided with an inflow port through which the atmosphere flows.

On the other hand, the hardening material supply pipe 10 provided in the tunnel T is connected to and communicates with a discharge side of a first pump 27 installed in the shaft or on the ground via a sixth valve 28 on the shaft side. And the pump 27 is
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 other end of the connecting pipe 31 is in communication with the water tank 11.

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

Reference numeral 40 denotes a line of the supply pipe 10 between the first valve 18 and the fourth valve 25 provided on the hardening material supply pipe 10 in the vicinity of the injection port member 2 on the shield machine 1 side. A mixer interposed and arranged in a state, a check valve 41
The quick-setting material supply pipe 42 having a connection 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. It is configured as follows.

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

In order to inject a hardening material such as mortar as a backing material into the gap between the segment S and the tunnel excavation wall surface t, first, the hydraulic unit 8 of the hydraulic circuit is operated and the piston forward pressure is set. Pressurized oil is supplied to the oil supply pipe 8a, and the rod body 5 in the inlet member 2 is moved forward to make the hardened material supply passage 7 communicate with the injection passage 4 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 connection pipe 15 is closed. Further, the first and second branch pipes 22, 22 'of the recovery pipe 21
Second and third valves 23 and 24 provided on the hardening material supply pipe
An eighth valve 30 provided on a connecting pipe 31 between the tank 10 and the water tank 11,
After closing the ninth and tenth valves 32 and 33 provided on the bypass pipe 34 side and opening the other valves, and then operating the first pump 27, the hardening in the hardening material tank 12 is started. The material M is pressure-fed to the feed pipe 10 by the pump 27,
Material supply passage 7 of inlet member 2 through mixer 40
And a certain amount is injected from the injection passage 4 into the gap,
Will be filled.

At this time, when the hardened material passes through the mixer 40, the hardened material 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 mixed as described above. The hardened material layer which is fed into the injection passage 4 side of the member 2 and is injected into the gap between the segment S and the tunnel excavation wall surface t and then hardens in a short time and is integrally fixed 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 hardened material injected into the gap between the mold and the tunnel excavation wall reaches a certain strength, and the mold is moved back and forth until it hardens. To reciprocate. This reciprocating motion is a shield machine 1.
This can be done with a jack connected to the formwork on the side.

After the hardening material injected and filled into the gap is hardened, a tunnel of a certain length is excavated again by the shield machine 1. After the injection of the hardening material into the gap is completed, a tunnel of a certain length is excavated. Then, while performing the next hardening material injection operation, or while the shield machine 1 is stopped due to a failure of the shield machine or the like, the hardening material injection passage 4 in the inlet member 2 is formed.
The hardening material remains in the hardening material supply passage 7 and the hardening material feeding pipe 10, and the hardening material adheres to the injection passage 4, the feeding passage 7, the hardening material feeding pipe 10, and hardens. This hinders the injection, so that after the injection of the hardening material into the space is completed, the residual hardening material is washed and removed with washing water.

The removal method is as follows. First, the hardening material whose curing speed has been accelerated by mixing of the quick-setting material remains in the pipe between the hardening material feeding passage 7 in the inlet member 2 and the mixer 40. After cleaning, the inside of the hardened material supply pipe 10 in which the quick-setting material is not mixed is washed. 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, closing the third valve 23 and the fifth valve 26, and the hydraulic circuit of the hydraulic circuit. The unit 8 is operated to supply pressure oil to the piston return movement pressure oil supply pipe 8b, and the rod body 5 in the injection port member 2 is moved backward to return the hardened material supply passage 7 as shown in FIG. And a washing circuit in which the washing water supply passage 6 is communicated with the washing circuit. In this case as well, the on-off valve 16 in the hydraulic circuit is opened and the switching valve 13 in the connection pipe 15 is closed.

When the second pump 37 is operated in this state,
Wash water from the inside of the water tank 11 flows from the wash water supply passage 6 of the inlet member 2 through the supply pipe 9 into the hardener supply passage 7 through the hardener injection passage 4, and further hardens from the hardener supply passage 7. The second branch pipe 2 provided with the second valve 24 from the fourth valve 25 through a mixer 40 in the pipe on the tip side of the material feeding pipe 10.
The hardening material flowing through the inside of the 2 ′ and remaining in the pipeline between them is pushed out to the recovery pipe 21 side by the washing water and washed. At this time, if the vacuum pump 38 installed on the shaft side is operated, the hardened material extruded toward the recovery pipe 21 can be quickly removed to the shaft side. The second pump
Reference numeral 37 denotes a high-pressure turbine pump, which can wash by pumping the washing water with a water pressure of 10 to ²⁰ kgf / cm ² =.

Next, if it takes a long time from the injection of the hardening material to the start of the cleaning, the hardening material feeding conduit for mixing the quick-setting material into the hardening material and the hardening material injection passage 4 of the injection port member 2 are required. In addition, the hardening material is hardened in the hardening material supply passage 7, and the hardening material cannot be washed and removed even with 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 operating at a low speed with a low excavation speed. In other words, during low-speed operation, the injection amount of the hardening material decreases, so that the hardening material mixed with the quick-setting material stagnates in the outer peripheral portion of the feed pipe or passage and flows in the central portion, so-called piping phenomenon occurs. However, the hardened material that does not flow adheres and accumulates on the inner wall of the passage such as the tube wall, and eventually becomes blocked.

Therefore, when the above-mentioned situation in which cleaning and removal cannot be performed with the supply pressure of the cleaning water as described above occurs, as described below, the hydraulic pressure (210 kgf / cm ² ) higher than the pressure of the cleaning water. Is used to wash and remove the hardening material in the feed pipes and passages. That is, the on-off valve in the hydraulic circuit
While closing 16, the switching valve 13 in the connection pipe 15 is opened to close the on-off valve 17 in the cleaning water supply passage 6, and the hardening material supply passage 7 and the cleaning water supply When high pressure oil is pressure-fed from the hydraulic unit 8 to the piston return pressure oil supply pipe 8b in a state where the cleaning circuit is switched to the washing circuit communicating with the supply passage 6, the pressure oil is sent from the connection pipe 15 to the washing water supply pipe 9 The cleaning water supply pipe 6 of the inlet member 2 flows from the cleaning water supply pipe 9
After being sent into the hardening material supply passage 7 through the hardening material injection passage 4, the hardening material is further fed into the hardening material supply passage 10 through the mixer 40 in the pipe on the distal end side of the hardening material supply pipe 10. The second branch pipe 2 provided with the fourth valve 25 to the second valve 24
2 ′, the hardening material injection passage 4 and the hardening material feeding passage 7
The hardening material remaining in the hardening material supply pipe inside and inside 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 hardening material feed pipe 10 until the quick-setting material is mixed, the hardening material remaining in the hardening material feed pipe 10 is eliminated and the inside of the feed pipe 10 is washed. First, after inserting a plug (not shown) into the bypass pipe portion between the ninth valve 32 and the tenth valve 33 through the eleventh valve 35 into the plug insertion pipe 36 communicating with the bypass pipe 34, 11th valve
With the 35 closed, a fifth valve 26 provided on the hardening material feed pipe 10 on the tunnel T side, a sixth valve 28 provided between the bypass pipes 34 and a seventh valve 29 on the hardening material layer side
Are closed, and the third valve 23, the eighth to tenth valves 30, 32, 33
When the first pump 27 is operated in a state where is opened, the washing water is supplied from the water tank 11 to the hardening material supply pipe 10 through the connecting pipe 31.

This washing water flows under pressure from the tenth valve 33 side into the bypass pipe 34, and the back surface of the plug is pressed by the water pressure so that the plug enters the hardening material supply pipe 10 through the ninth valve 32, The hardening material remaining in the feed pipe 10 is pushed forward while sliding in the feed pipe 10, flows out to the first branch pipe 22 provided with the third valve 23, and is pushed out to the recovery pipe 21. Is removed to the shaft. During this time, when the plug passed through the electromagnetic densitometer 19 provided in the hardening material feed pipe 10 in the tunnel T, the density meter 19 changed the inside of the feed pipe 10 from hardening material to washing water. That is detected.

When the change from the hardened material to the washing water is detected by the densitometer 19, the signal transmitted from the densitometer 19 immediately passes through the controller to the second valve.
By opening 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 collection pipe 21. At this time, the plug faces the plug receiving port of the separator 20. Thereafter, when the fifth valve 26 is closed and the third valve 23 is opened, the residual hardening 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 reduced, the flow rate of the washing water increases, and the residual hardened material is completely washed even without a plug. can do.

The discharge of the hardening material in the first branch pipe 22 is as follows.
When it is detected by the densitometer 19 that the hardening material has been changed to the washing water, the plug body is put into the first branch pipe after a while.
Since the residual hardening material in the second branch pipe 22 ′ may be washed after being discharged from the pipe 22 into the recovery pipe 21. When the residual hardening material and the plug are discharged to the recovery pipe 21, the vacuum pump 38, which has been operated in advance, is captured through the recovery pipe 21 in the vacuum tank 29 on the shaft, and can be retained and removed.

To clean the inside of the sixth valve 28 provided in the feed pipe 10 between the bypass pipes 34, the plug is sent to the feed pipe 10 side, and then the ninth valve 28 in the bypass pipe 34 is washed. 10th valve
This is performed by closing 32 and 33 and opening the sixth valve 28. Further, when the inside of the injection member 2 is washed using the above-mentioned washing water supply pipe 9 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 supply pipe 10 ahead of the separator 20 may be passed through the first branch pipe 22 for cleaning.

The plug which has reached the inside of the separator 20 enters the branch pipe 22 as in the above embodiment, while the hardening material flows from the feed pipe 10 through the passage in the hardening material inlet member 2 as described above. Collection pipe
Outflow to 21. At this time, if the vacuum pump 38 is operated together with the first pump 27, the hardened material can be smoothly removed through the collection pipe 21 toward the shaft. In addition, concentration meter
Detection of when the elimination of the hardener is completed by 19, and
Automatic switching of each valve by an electric signal from the densitometer 19 is the same as in the above embodiment. In addition, the stopper body can be used not only when the hardening material in the tube is removed by the washing water as described above, but also when the hardening material is fed again into the feeding pipe 10 filled with the washing water. . At this time, the plug passes through the densitometer 19 and enters the first branch pipe 22, and when the densitometer 19 detects that the washing water has changed to a hardening material, the hardening material flows in the direction of the inlet member 2. Operate the valve.
As described above, the substance flowing in the tube can be identified by the densitometer 19, and the signal can be used to automatically operate the valve.

[0039]

As described above, according to the present invention, the injection port which is mounted at 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 reciprocating the piston. When cleaning the member, switch to the cleaning circuit after the hardening material is injected, and wash the inside of the hardening material injection circuit by flowing the washing water in the hardening material injection circuit in the opposite direction to the time of the hardening material injection, and wash with the cleaning water. When cleaning is not possible, high pressure oil is supplied to the cleaning circuit from the hydraulic circuit for driving the piston and the cleaning is performed by 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 hardener remaining in the hardener injection passage and hardener feed passage in the inlet member, which is difficult to wash and remove with the wash water, is pushed out to the hardener feed pipe side with a higher pressure oil than the wash 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 smoothly and smoothly injecting hardening material into the tunnel excavation wall while reliably preventing the hardening material from being blocked in the hardening material supply passage and pipeline. It is.

[Brief description of the drawings]

FIG. 1 is a piping diagram from a shaft to a shield machine,

FIG. 2 is a longitudinal sectional side view of an inlet member mounted on a rear end of the shield machine.

FIG. 3 is a longitudinal front view thereof,

FIG. 4 is a cross sectional view thereof,

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shield machine 2 Injection member 4 Hardening material injection passage 5a, 5b Piston 6 Cleaning water supply passage 7 Hardening material supply passage 8 Hydraulic unit 8a, 8b Pressure oil supply tube 9 Cleaning water supply tube 10 Hardening material supply tube

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-8-218780 (JP, A) JP-A-2-8500 (JP, A) JP-A-6-117193 (JP, A) (58) Field (Int. Cl. ⁷ , DB name) E21D 11/00

Claims (2)

(57) [Claims] 1. A method for 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. The washing circuit is switched to the washing circuit, and the washing water is caused to flow in the hardening material injection circuit in the opposite direction to the hardening material injection circuit to wash the inside of the hardening material injection circuit. A high-pressure oil is supplied to a cleaning circuit from a side and the high-pressure oil is used for cleaning, and a method of cleaning an inlet member in a shield method. 2. An injection port member mounted at the rear end of the shield machine has a hardening material injection passage opening rearward toward a tunnel excavation wall surface, and a hardening material supply passage communicating with a front end side of the hardening material injection passage. And a washing water supply passage for sending low pressure washing water, and a piston reciprocating by high pressure oil pressure is provided in the hardening material injection passage, and the hardening material is moved forward by the piston. The supply passage communicates with the hardening material injection passage to form a hardening material injection circuit, while the piston moves backward to connect the cleaning water supply passage to the hardening material supply passage to form a cleaning circuit. Further, the hydraulic circuit for driving the piston is connected to a washing water supply pipe connected to the washing water supply passage of the injection port member through a switching valve to the washing water supply passage. It is configured to supply high-pressure oil An apparatus for cleaning an inlet member in a shield method.