JPH09273394A - Exclusion method of hardened material in hardened material supply pipe in shield method - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To form a hardening material layer by injecting a hardening material from a rear end of a shield machine into a space between an excavation wall surface and a segment through a pipe lined from a vertical shaft into a tunnel, and then forming a hardening material layer. The hardener remaining in the passage is removed so that the next hardener injection step can be smoothly performed. SOLUTION: A plug is inserted into the pipeline from the vertical shaft side, and then wash water is supplied to the back side of the plug, and the plug is advanced by the feed pressure of the wash water to advance the plug in the tunnel. The remaining hardened material is sent out to the collection pipe side, and the plug and hardened material are sent out to the vertical shaft side through the collection pipe and eliminated.

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 which a hardener is supplied from a segment at the rear end or the frontmost end of the shield machine to a tunnel excavation wall surface to form a hardener layer in the tunnel. The present invention relates to a method for removing a hardened material in a hardened material supply pipe that is piped to a vertical shaft side when the hardened material in the hardened material supply pipe is stopped from being supplied to a tunnel excavation wall surface side.

[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. The hardened layer that reinforces the excavated wall surface is formed by backfilling and injecting a hardening material from the segment at the rear end or the frontmost end of the shield excavator between the segment or the mold and the excavation wall surface.

As a backfilling material injecting means, as described in Japanese Utility Model Publication No. 6-34472, a hardening material is fed from a vertical shaft or from the ground side to the rear end of a shield machine through a tunnel. A supply pipe is installed, and the hardener is transported to the shield machine side through the hardener feed pipe by the operation of the pump, and the hardener is injected from the rear end of the shield machine between the tunnel excavation wall surface and the segment or formwork. The means to do is adopted. Then, after the curing material is injected and cured, until the next injecting work, if the curing material remaining in the curing material supply pipe is cured in the pipe, it becomes difficult to supply the curing material. It is necessary to eliminate the material.

As the removing means, a plug body made of sponge or the like is inserted into the tube on the feed start end side of the hardening material feed tube, and the pump is driven to pump cleaning water to the back side of the plug body. As a result, the sponge is slidably brought into contact with the inner circumferential surface of the hardened material feeding pipe and moved forward so that the hardened material in the feeding pipe is discharged from the tip side of the feeding pipe through the branch pipe into the container installed in the tunnel. I am configuring. On the other hand, for collecting the plug, a short pipe having a diameter larger than that of the feeding pipe is provided at an appropriate position of the hardening material feeding pipe in the tunnel, and the plug moving forward in the hardening material feeding pipe is used for this short pipe. It is carried out by catching it with a wire mesh stretched inside the pipe and opening the short pipe after the cleaning of the feed pipe is completed.

[0005]

However, since the hardened material is discharged into the tunnel, not only is it necessary to perform post-treatment, but also the discharge of the hardened material in the feed pipe is completed, that is, the cleaning of the inside of the pipe is completed. Not only is the operation troublesome because the worker decides when to open the valve by opening and closing a part of the supply pipe and observing the hardened material flowing out from the supply pipe in the tunnel. It is difficult to make an accurate judgment. In addition, since the short pipe is artificially opened after the completion of discharging the hardened material after the plug is taken out from the short pipe, the hardened material is not only removed, but the hardened material is also applied to the tunnel excavation wall surface. There is a problem in that the efficiency of the work is reduced because the feeding process cannot be automated.

The present invention has been made in view of the above problems, and aims to automate the process of cleaning the inside of the feed pipe by eliminating the hardened material in the feed pipe, and by extension, to the hardened material for the tunnel excavation wall surface after washing. Enables the automatic delivery of
Further, the present invention provides a method for removing a hardened material in a hardened material supply pipe in a shield method in which a hardened material or a plug is discharged to a vertical shaft at the time of cleaning the inside of the feed pipe so that the recovery can be performed smoothly.

[0007]

A method of removing a hardened material in a hardened material feeding pipe in a shield construction method according to the present invention is, as described in claim 1, a tunnel machine excavated by a shield machine and a rear end of the shield machine. Or, in the shield construction method of excavating the tunnel while supplying the curing material from the inlet provided in the earliest segment to form the layer of the curing material, the curing material supply pipe communicating from the vertical side to the inlet through the tunnel is provided. The hardener feed pipe near the shield machine is installed and a recovery pipe is placed up to the vertical shaft side to form a hardener layer on the tunnel wall surface, and then a plug is placed inside the hardener feed pipe on the vertical shaft side. By supplying cleaning water to the back side of the stopper, the stopper is pushed to the shield machine side by water pressure, and the hardener remaining in the hardener feed pipe is fed to the recovery pipe side,
The curing material is removed to the vertical shaft side through the recovery pipe, while the plug is sent from the curing material feed pipe to the recovery pipe side and recovered on the vertical shaft side.

In the above method, as described in claim 2, the first portion is provided at the front end portion of the hardening material feed pipe rather than the recovery pipe branch portion.
A valve is provided and a second valve or a third valve is provided in the recovery pipe so that the first valve is closed and the second valve or the third valve is opened when cleaning the inside of the hardening material supply pipe. ing. Further, as described in claim 3, in the above method, a cleaning water supply port communicating with the hardening material injection port is provided, and the cleaning water supply pipe is provided in the cleaning water supply port through the tunnel from the vertical shaft side. And the cleaning water is supplied to the recovery pipe from the hardening material supply pipe communicating with the hardening material injection port through the cleaning water supply port.

A fourth aspect of the present invention is an invention different from the method for removing the hardened material in the hardened material feeding pipe in the shield construction method described above, in which the rear end of the shield machine or the rear end of the shield machine is formed on the tunnel wall excavated by the shield machine. In a shield construction method in which a hardening material is supplied from an injection port provided in the earliest segment to form a hardening material layer and a tunnel is excavated, a hardening material having a first valve communicating with the injection port from the vertical shaft side through the tunnel A feed pipe is provided, a recovery pipe is connected to the inlet, the recovery pipe is placed through the tunnel to the vertical shaft side, a hardening material layer is formed on the tunnel wall surface, and then the hardening material is fed on the vertical shaft side. By inserting the plug into the pipe and supplying washing water to the back side of the plug, the plug is pushed hydraulically to the shield machine side and the hardened material remaining in the hardened material feed is sent to the recovery pipe side. While eliminating the stiffeners on the pit side through the recovery pipe, it is characterized in that the recovering in vertical shaft side feed the plug body from the hardened material feed pipe to the recovery pipe side.

In the method according to claim 1 or 4, the invention according to claim 5 is such that a hardening material passage and a plug passage are provided in the tunnel at the rear side of the first valve of the hardening material feeding pipe. And a stopper passage of the separator are connected to and communicated with the recovery pipe through a branch pipe having a third valve. Further, as a preferable structure of the means for collecting the stopper and the means for discharging the hardened material, as described in claim 6, a recovery pipe having an air intake port opened at the front end and a vacuum pump interposed at the rear end. The stopper is captured and collected in the vacuum pump via the above, and the hardening material is discharged backward.

The structure of the separator is claim 7.
As described in (1), the separator is composed of a short pipe having a diameter larger than that of the hardening material feeding pipe at the rear of the separator, and the hardening material feeding pipe at the front end of the separator is provided at the rear end of the hardening material feed pipe at the rear end. The material feed pipe is connected and communicated with each other, and an inlet and an outlet are provided respectively, and a rear end of the branch pipe having a diameter substantially the same as that of the hardened material feed pipe is watertightly penetrated and projected from the front end to the inside. The inside of the projecting end is used as a plug passage, and its opening is exposed from the outlet to the inlet on the rear side, and the space from the inlet to the outlet is formed in the hardening material passage. .
Further, in the invention according to claim 8, the hardener feed pipe on the rear side of the separator is provided with an electromagnetic densitometer of the hardener to discriminate between the cleaning water and the hardener so that the valve It is designed to switch automatically.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The operation of the method described in claim 1 will be described. The hardening material is injected between the tunnel wall excavated by the shield machine and the segment or the mold to cure the method. When forming a layer, the first valve provided on the feeding end side of the hardening material feeding pipe is opened, while the second valve provided on the recovery pipe branched from this hardening material feeding pipe is opened. In the closed state, the hardening material is fed from the inside or outside of the shaft to the hardening material feeding pipe, and the hardening material is back-filled and injected from the inlet provided at the rear end of the shield machine.

Next, when the step of injecting the hardening material is completed, the step of removing the hardening material remaining in the hardening material supply pipe is started. In this step, first, while closing the first valve,
After opening the second valve on the side of the recovery pipe and inserting the plug into the pipe on the feed start end side of the hardening material feed pipe, washing water is fed into the feed pipe. Then, the plug moves forward in the pipe while slidingly contacting the inner wall of the feed pipe due to the pressure-feeding pressure of the wash water, and pushes the hardened material remaining in the feed pipe toward the recovery pipe while sending the hardened material through the recovery pipe. It is removed to the vertical shaft and the inside of the hardening material feed pipe and the recovery pipe is washed with washing water. On the other hand, the plug is also sent to the vertical shaft and removed.

As a means for recovering this stopper, the invention according to claim 5 is provided.
When the structure described in claim 7 is adopted, if the plug reaches the separator while the hardening material in the hardening material feed pipe is sent to the recovery pipe side through the plug by the cleaning water, the hardening pipe is connected to the feed pipe. While the plug is fed into the opening end of the branch pipe projecting into the separator through the inlet of the separator, the hardening material is supplied to the outer peripheral surface of the opening end of the branch pipe and the inner surface of the separator by pumping wash water. Through the outlet provided in the peripheral wall of the separator into the front feed pipe, and is discharged to the vertical shaft side through the recovery pipe as described above. This removal is forcibly sucked and removed by operating the vacuum pump provided on the terminal end side of the recovery pipe, and the plug body introduced into the branch pipe is the third provided on the branch pipe. By opening the valve, it is captured and collected in the tank on the pump side by the suction force of the vacuum pump.

Further, when an electromagnetic concentration meter for the hardening material is provided at an appropriate position on the hardening material feeding pipe on the rear side of the separator,
When the stopper passed through the separator, it was possible to detect by the densitometer that the inside of the feed pipe had changed from the hardening material to the cleaning water, and the hardening material was removed, that is, the inside of the feeding pipe was cleaned. It is possible to automatically determine whether or not each valve is to be automatically switched between the time of supplying the hardening material and the time of cleaning the inside of the pipe by the electric signal from the densitometer.

Further, as described in claim 3, a cleaning water supply pipe communicating with the cleaning water supply port provided at the rear end of the shield machine through the tunnel from the vertical shaft is provided separately from the hardening material supply pipe. By arranging it, if cleaning water is sent under pressure to this supply pipe, the cleaning water will flow from the above-mentioned curing material supply pipe communicating with the curing material injection port through the supply port to the recovery pipe, and will be recovered from the curing material injection port. The inside of the passage leading to the pipe can be cleaned.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, specific embodiments of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 is a shield machine for excavating a tunnel T by propelling the cutter plate 1a while rotating it, and an injection port member 3 is fixed to the rear end of the skin plate 1b. On the other hand, inside the vertical shaft on the starting side of the excavation of the tunnel T or outside the ground, that is, the shield machine 1
On the other hand, a hardening material tank 2 containing a hardening material M such as mortar is installed on the vertical shaft side, and the rear end of the hardening material feed pipe 4 is connected to and communicated with the hardening material tank 2. The material feeding pipe 4 is connected through the tunnel T to a hardening material passage 3a, which will be described later, provided in the injection port member 3 of the shield machine 1, and is in communication therewith. The inlet member 3 may be provided in the frontmost segment following the shield machine.

In the line of the hardening material feed pipe 4,
A first valve 5 is provided in the vicinity of the injection port member 3 fixed to the shield machine 1, and a tunnel T in the vicinity of the shield machine 1 on the rear side of the first valve 5 is provided.
Electromagnetic densitometer 6 connected to a controller that sends a signal to open and close each valve described later in the line of the supply pipe 4 inside
Is provided, and further, the feed pipe 4 on the front side of the densitometer 6 is provided.
A separator 7 is provided in the line of the feed pipe 4 that connects the feed pipe 4 to the shield machine 1 side and a first branch pipe 9 side that leads to a recovery pipe 8 side described later. Has been branched into. The first branch pipe 9 is provided with a third valve 13.

A second valve 10 is provided at an appropriate position of the feed pipe 4 leading from the separator 7 to the shield machine 1 side, and a second branch pipe 9'which connects the rear end side to a recovery pipe 8 which will be described later is connected and communicated. In addition, the fourth and fifth valves 11 and 12 are provided at the front and rear sides of the feed pipe 4 which sandwich the second branch pipe 9 '. The collection pipe 8 connecting and communicating these first and second branch pipes 9 and 9'communicates through a vacuum tank 15 to a vacuum pump 14 installed inside the shaft through the tunnel T or on the shaft side such as on the ground. are doing. The diameter of the feed pipe 4 from the separator 7 to the shield machine 1 and the second branch pipe 9'is smaller than the diameter of the feed pipe 4 to the separator 7, and the hardening that flows through the feed pipe 4 is performed. Material is separator 7
At the boundary, the flow velocity is increased. The diameter of the first branch pipe 9 is equal to the diameter of the feed pipe 4 up to the separator 7, and a plug V described later flowing down the feed pipe 4 passes through. Furthermore, the recovery pipe 8
Has a diameter larger than that of the feed pipe 4 up to the separator 7, and is provided at its front end with an inflow port through which atmospheric air flows.

On the other hand, the hardening material feed pipe 4 provided in the tunnel T is connected and communicated with the discharge side of the first pump 16 installed in the shaft or on the ground via the sixth valve 17 on the shaft side. While this pump 16 is operating,
Through a feed pipe section having a seventh valve 18. Further, the feed pipe 4 between the pump 16 and the seventh valve 18
One end of a connecting pipe 20 having an eighth valve 19 is connected to the portion,
While communicating, the other end of the connecting pipe 20 communicates with a water tank 21 installed in the shaft or on the ground.

Further, both ends of a bypass pipe 24 having a ninth valve 22 and a tenth valve 23 are communicated with the portion of the feed pipe 4 on both sides of the sixth valve 17, and the ninth and tenth valves are connected.
An insertion pipe 25 of a plug V having an eleventh valve 44 is connected and communicated with a bypass pipe portion between the valves 22 and 23. Further, the rear end of the cleaning water supply pipe 26 is connected to and communicates with the water tank 21, and the cleaning water supply pipe 26 is disposed in the tunnel T via the second pump 27, and the front end thereof is shielded. The injection port member 3 of the machine 1 is connected to and communicates with a cleaning water passage 3b described later.

As shown in FIGS. 2 to 5, in the injection port member 3, a viston chamber 31 and a hardening material injection port 32 are formed on the same center line in the center portion in the width direction between the front and rear end faces. The piston chamber 31 is provided on the front half side of the injection port member 3, and the injection port 32 is provided on the rear half side thereof, and the injection port 32 is formed into a tunnel excavation wall surface t and a segment or form (hereinafter, referred to as a segment) S. It faces the gap between. Further, a partition wall 34, through which a rod body 33 having a certain length is slidably inserted, is provided at the connecting portion of the piston chamber 31 and the injection port 32.

A piston chamber 31 is provided at the front end of the rod body 33.
A first piston 35 that slides back and forth inside is fixed, and a second piston 36 that slides back and forth inside the injection port 32 is fixed to the rear end portion. A pressure oil port 37 that communicates from the lower surface of the injection port member 3 into the piston chamber 31 with the first piston 35 interposed therebetween,
38 is drilled and is connected to a pressure oil supply source (not shown) through pipes 50 and 51.

The above-mentioned hardening material passage 3a and the washing water passage 3b are provided in the injection port member 3, and one end of the hardening material passage 3a is located at the middle portion of the injection port 32, that is, the forward movement start end position. The second piston 36, which is on standby, is communicated with the rear space of the second piston 36, and the other end of the second piston 36 is opened to the inner surface of the injection port member 3 so as to be connected and communicated with the hardening material supply pipe 4 as described above. on the other hand,
One end of the cleaning water passage 3b communicates with the inside of the front end portion of the injection port 32, that is, the back side of the partition wall 34, and the other end is opened to the inner surface of the injection port member 3 as described above. The supply pipe 26 is connected and communicated. A small-diameter confirmation rod 39 is integrally provided at the center of the front end surface of the rod body 33 so as to project forward.

Further, in the structure of the separator 7, as shown in FIG. 6, the container body is formed of a short pipe having a diameter larger than that of the hardening material feeding pipe 4, and the front end small diameter opening portion and the peripheral wall portion thereof are formed. The opening formed in the hard material introduction port 7a and the discharge port 7b are formed, and the opposite opening ends of the cut-off portions of the hardening material supply pipe 4 are connected to and communicate with the introduction port 7a and the discharge port 7b, respectively. As a result, the structure is arranged in the line of the hardening material feeding pipe 4. Further, the rear end of the branch pipe 9 is watertightly penetrated from the front end of the separator 7 so as to project to the rear side of the outlet 7b, so that the opening of the protruding end is introduced into the inlet 7a.
And the inside of this protruding end is formed as a plug passage 9a. On the other hand, the internal space extending from the inlet 7a to the outlet 7b is formed in the hardening material passage 7c. This hardener passage
The passage width of 7c is made smaller than the diameter of the plug body V so that the plug body V does not enter the passage side.

Reference numeral 40 communicates with the line of the feed pipe 4 between the first valve 5 and the fourth valve 11 provided in the hardening material feed pipe 4 near the injection port member 3 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.

A method of forming a hardened layer on the tunnel excavation wall surface by using the hardener supply pipe line and the wash water supply pipe line configured as described above, and a method of removing the hardener in the pipe and cleaning 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.

To inject a hardening material such as mortar as a backing material into the space between the segment S and the tunnel excavation wall surface t, the recovery pipe 8 is provided with first and second branch pipes 9 and 9 '. The second and third valves 10, 13 which are installed, the hardening material feed pipe 4 and the water tank
After the eighth valve 19 provided on the connecting pipe 20 between the two and the ninth and tenth valves 22 and 23 provided on the bypass pipe 24 side are closed and the other valves are opened, First
When the pump 16 is operated, the hardening material M in the hardening material tank 2 is pressure-fed to the feeding pipe 4 by the pump 16, and the hardening material passage of the injection port member 3 is passed from the hardening material passage 7c in the separator 7 through the mixer 40. It flows into 3a, and a certain amount is injected and filled from the injection port 32 into the above-mentioned void.

At this time, when the hardened material 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 injected as described above. A hardened material layer that is fed to the injection port 32 side of the member 3 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 instead 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. After the completion of the injection of the hardening material into the void, a tunnel of a certain length is excavated. During 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 passage 3a in the injection port member 3 and the hardening material feed pipe 4 are introduced. Hardener remains, and if this hardener adheres to the injection passage 3a, the hardener feed pipe 4 and the like and hardens, it will hinder the injection, so after the completion of the injection of the hardener into the void, this residual The hardening material is washed and removed with washing water.

The removing method is as follows. First, the inside of the pipe between the mixer 40 and the curing material passage 3a in the injection port member 3 in which the curing material whose curing speed is accelerated by the mixing of the quick-setting material remains. After that, the hardened material supply pipe 4 in which the quick-setting material is not mixed
Clean the inside. For cleaning the hardener passage 3a side, the first valve 5, the fourth valve 11, and the second valve 10 are opened, and the third valve is opened.
13 and the fifth valve 12 are closed and the rod body 33 in the injection port member 3 is moved forward so that the hardening material passage 3a and the washing water passage 3b are in communication with each other as shown in FIG. .

When the second pump 27 is operated in this state,
Cleaning water from the water tank 21 flows into the hardening material passage 3a from the washing water passage 3b of the inlet member 3 through the feeding pipe 26, and further from the hardening material passage 3a to the tip side of the hardening material feeding pipe 4. The hardener remaining in the second branch pipe 9'provided with the fourth valve 11 and the second valve 10 through the mixer 40 and remaining in the pipeline between them flows to the recovery pipe 8 side by the washing water. Extruded,
Washed. At this time, by operating the vacuum pump 14 installed on the vertical shaft side, the hardened material extruded to the recovery pipe 8 side can be promptly removed to the vertical shaft side.

Next, in order to remove the hardened material remaining in the hardened material feeding pipe 4 and clean the inside of the hardened material feeding pipe 4, first,
The 11th valve 44 is installed in the plug insertion tube 25 communicating with the bypass tube 24.
After inserting the plug V into the bypass pipe portion between the ninth valve 22 and the tenth valve 23, the eleventh valve 44 is kept closed and provided in the hardening material feeding pipe 4 on the tunnel T side. Sixth provided between the fifth valve 12 and the bypass pipe 24
Close the valve 17 and the seventh valve 18 on the hardener layer side to
When the first pump 16 is operated with the valve 13 and the eighth to tenth valves 19, 22, 23 opened, the connecting pipe from the water tank 21.
Cleaning water is supplied to the hardening material supply pipe 4 through 20.

This wash water is supplied from the 10th valve side to the bypass pipe.
It flows under pressure, and the back surface of the plug body V is pressed by the water pressure so that the plug body V enters the hardening material feed pipe 4 through the ninth valve 22 and moves forward while sliding inside the feed pipe 4. The hardened material remaining in the feed pipe 4 is pushed forward, flows out to the first branch pipe 9 provided with the third valve 13, is pushed out to the recovery pipe 8, and is discharged to the vertical shaft side. During this time, the plug V reaches the separator 7 and enters the passage 9a of the first branch pipe 9 projecting into the separator 7, while the plug V enters the hardening material feed pipe 4 in the tunnel T. When passing through the electromagnetic densitometer 6 provided, it is detected that the inside of the feed pipe 4 is changed from the hardening material to the washing water by the concentration diameter 6.

When it is detected by the densitometer 6 that the hardened material is changed to washing water, a signal sent from the densitometer 6 immediately causes the second valve to pass through the controller.
By opening 10 and the fifth valve 12 and closing the third valve 13, the wash water flows from the separator 7 to the second branch pipe 9 ', and the hardening material therein is automatically discharged to the recovery pipe 8. At this time, the plug V faces the passage 9a of the separator 7. After that, when the fifth valve 12 is closed and the third valve 13 is opened,
The residual hardened material together with the plug V is completely and automatically discharged from the first branch pipe 9. At this time, the feed pipe 4 from the separator 7 to the front side
Also, since the diameter of the second branch pipe 9'is made small, the flow rate of the washing water becomes high, and the residual hardened material can be completely washed without the plug V.

The hardened material in the first branch pipe 9 is discharged by
When it is detected by the densitometer 6 that the hardened material is changed to the cleaning water, the plug body V is discharged from the first branch pipe 9 into the recovery pipe 8 after a while. The residual hardened material inside may be washed. When the residual hardened material and the plug V are discharged to the recovery pipe 8, the vacuum pump 14 that has been operated in advance captures the residual hardened material and the plug V in the vacuum tank 15 on the vertical shaft side through the recovery pipe 8 and can be retained and removed. The cleaning of the inside of the sixth valve 17 provided in the feed pipe 4 between the bypass pipes 24 is performed by feeding the plug V to the feed pipe 4 side, and then cleaning the ninth and the ninth pipes in the bypass pipe 24. Ten
This is done by closing the valves 22 and 23 and opening the sixth valve 17. Also, the second branch pipe 9'and the second
When the inside of the injection member 3 is cleaned by using the above-mentioned cleaning water supply pipe 26 without providing the valve 10, the third valve 13 is opened and the sixth valve 17 is closed so as to be located in front of the separator 7. The hardening material in the feed pipe 4 may be passed through the first branch pipe 9 to be washed.

In the above embodiment, the tip of the hardener feed pipe 4 provided with the mixer 40 from the hardener passage 3a in the injection port member 3 using the wash water feed pipe 26. Although the cleaning process and the cleaning process for the other pipe parts of the hardening material supply pipe 4 are separately performed, the cleaning material supply pipe 26 is not used, and the curing material supply pipe 4 is used for the injection port member. Hardener passage 3a in 3
It is possible to configure the pipelines so that the hardening material in all the pipelines up to is simultaneously washed with washing water.

FIG. 7 is a diagram of the pipeline. The pipeline shown in FIG. 1 differs from the pipeline shown in FIG. 1 in that the cleaning water feed pipe 26 provided with the second pump 27 is not provided, the separator 7 and the mixer. Without providing the fourth and fifth valves 11 and 12 in the feeding pipe between 40, and the above second
Connect the front end of the recovery pipe 8 provided with the valve 10 to the fourth valve 11
The difference is that the front end of the recovery pipe 8 is connected and communicates with the cleaning water passage 3b of the injection port member 3 without being connected and communicated with the line of the hardening material feeding pipe 4 between the fifth valve 12 and the fifth valve 12. However, since the other configurations are the same as those in FIG. 1, the same reference numerals are given to the same portions and the description thereof will be omitted.

With this configuration, when the pump 16 is operated, the valves are opened and closed when the hardening material is pressure-fed from the hardening material tank 2 through the hardening material supply pipe 4 to the hardening material passage 3a of the injection port member 3. The state is the same as that described in FIG. Next, the hardening material feed pipe 4 is washed with cleaning water.
When cleaning the hardened material passage 3a of the injection port member 3 from the inside, the eleventh valve 24 is passed through the plug insertion tube 25 communicating with the bypass pipe 24 and the bypass pipe between the ninth valve 22 and the tenth valve 23. After inserting the plug body V into the portion, the eleventh valve 24 is kept closed and the sixth valve 17 provided between the first valve 5 and the bypass pipe 24 and the seventh valve on the side of the hardening material tank 2
The valve 18 is closed, the third valve 13 is opened, and the first piston 35 is operated to move the second piston 36 rearward near the outlet of the hardening material passage 3a.

When the pump 16 is operated in this state,
Cleaning water is supplied from the water tank 21 to the hardening material supply pipe 4 through the connecting pipe 20, and the cleaning water is supplied from the 10th valve side to the bypass pipe 24.
As in the above embodiment, the back surface of the plug V is pressed by the water pressure, and the plug V enters the hardening material feed pipe 4 through the ninth valve 22 and slides in the feed pipe 4. While moving forward, the hardened material remaining in the feed pipe 4 is pushed forward. When the densitometer 6 detects that the plug V has reached the separator 7 and entered the passage 9a of the branch pipe 9 projecting into the separator 7, the first valve 5 is immediately recalled and the third valve 13 is detected. Close. Then, the hardening material in the pipe line in front of the separator 7 is
After the cleaning water flows from the hardening material injection passage 3a of the injection port member 3 to the cleaning water passage 3b, it flows in the recovery pipe 8 and is discharged to the vertical shaft side.

The plug V which has reached the inside of the separator 7 enters the passage 9a of the branch pipe 9 as in the above embodiment, while the hardening material is the passage 9a.
As described above, it flows through the passage 7c on the outer peripheral side of the feeding pipe 4 through the passage in the hardening material injection port member 3 and flows out to the recovery pipe 8. At this time, vacuum pump together with the first pump 16
If 14 is operated, the hardened material can be smoothly removed to the vertical shaft side through the recovery pipe 8. The detection at the time when the removal of the hardened material is completed by the densitometer 6 and the automatic switching of each valve by the electric signal from the densitometer 6 are the same as in the above embodiment. The plug V is used not only when the hardening material in the pipe is removed by the cleaning water as described above, but also when the hardening material is fed again into the feeding pipe 4 filled with the cleaning water. it can. Also at this time, when the plug V passes through the densitometer 6 and enters the passage 9a of the first branch pipe 9 and the densitometer 6 detects that the washing water is changed to the hardened material, the hardened material of the inlet member 3 is detected. Operate the valve to flow in the direction. In this way, the substance flowing in the tube can be identified by the densitometer 6, and the valve can be automatically operated by the signal.

[0043]

As described above, according to the method for eliminating the hardened material in the feed pipe in the shield construction method of the present invention, the hardened material is supplied from the vertical shaft to the tunnel wall excavated by the shield machine through the hardened material feed pipe. After forming the hardening material layer, the plug is inserted into the feed pipe and the cleaning water is supplied to the back side of the plug to set the hardening material remaining in the hardening material feed pipe and the inside of the feeding pipe. It is possible to reliably remove the precipitate of No. 2 through the collection pipe communicating with the tip side of the feed pipe, and moreover,
Since it is eliminated in the vertical shaft or on the ground side, it is possible to eliminate the trouble of post-treatment of the hardened material, and to easily collect the plug body so that the next work can be carried out smoothly.

Furthermore, a separator for the hardening material and the plug is provided in the conduit of the hardening material feed pipe in the tunnel, and the plug passage in this separator is communicated with the recovery pipe side. By this, the plug can be taken into the recovery pipe side without sending it to the hardener injection passage side provided at the rear end of the shield machine that cannot pass through, and the hardener injection passage side can be reliably washed with only cleaning water. It is possible.

Further, by interposing and disposing a concentration meter of the curing material in the curing material supply pipe in the rear tunnel of the separator, it is possible to control the quality of the curing material flowing in the curing material supply pipe. Not only the cleaning water and the curing material can be distinguished by the densitometer, but it is detected that the inside of the curing material feed pipe has been cleaned by the cleaning water and the signal from the densitometer is transmitted to the valve pipe. The valve in the road can be automatically switched, the hardening material can be supplied to the tunnel excavation wall surface, and the washing process with washing water can be automated, so that the workability of tunnel construction can be improved.

[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 provided in a 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 the hardening material passage and the washing water passage are in communication with each other,

FIG. 6 is a longitudinal side view of the separator,

FIG. 7 is a piping diagram showing another embodiment of the present invention.

[Explanation of symbols]

 1 shield machine 2 hardening material tank 3 injection member 4 hardening material feeding pipe 5 first valve 6 concentration meter 7 separator 8 recovery pipe 9 branch pipe 10 second valve 13 third valve 16 pump 21 water tank 32 injection port V plug Body t tunnel excavation wall

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Collection Minoru 2-10-9 Izumi, Suginami-ku, Tokyo (72) Inventor Yuichi Manji 2-220 Kosugicho, Nakahara-ku, Kawasaki (72) Inventor Hiroshi Wada Osaka 2-2-2 Matsuzaki-cho, Abeno-ku, Osaka-shi Okumura-gumi, a stock company (72) Inventor Takeshi Hayashi 2-2-2 Matsuzaki-cho, Abeno-ku, Osaka-shi Okumura-gumi (72) Inventor Shoichi Arai Chiyoda, Tokyo 1-6-1, Otemachi, Ward Daiheiyo Kiko Co., Ltd.

Claims (8)

[Claims] 1. A shield construction method in which a hardening material is supplied to a wall surface of a tunnel to be excavated by a shield machine from an injection port provided at a rear end of the shield machine or an earliest segment to form a hardening material layer, and the tunnel is advanced. , A hardening material feed pipe communicating from the vertical shaft side through the tunnel to the above-mentioned inlet is arranged, and a recovery pipe is branched from the hardening material feed pipe in the vicinity of the shield machine to the vertical shaft side. After forming the hardener layer, insert the plug into the hardener feed pipe on the vertical shaft and supply cleaning water to the back side of the plug to push the plug to the shield machine side with water pressure and cure. The hardened material remaining in the material feed pipe is sent to the collection pipe side, and the hardened material is removed to the vertical shaft side through the collection pipe, while the plug is sent from the hardened material feed pipe to the collection pipe side and collected on the vertical shaft side. Characteristic sea Hardened material removal method in the hardened material supply pipe in the construction method. 2. When cleaning the inside of the hardening material supply pipe, a first valve is provided at the front end of the recovery material branch of the hardening material supply pipe, and a second valve or a third valve is provided in the recovery pipe. The method for removing a hardening material in a hardening material supply pipe according to claim 1, wherein the first valve is closed while the second valve or the third valve is opened. 3. A cleaning water supply port communicating with the hardening material injection port is provided, and a cleaning water supply pipe arranged through the tunnel from the vertical shaft is communicated with the cleaning water supply port to cure through the cleaning water supply port. The method for removing hardened material in a hardened material supply pipe according to claim 1, wherein cleaning water is supplied from the hardened material supply pipe communicating with the material injection port to the recovery pipe. 4. A shield construction method in which a hardening material is supplied to a tunnel wall excavated by a shield machine from an injection port provided at a rear end of the shield machine or at a frontmost segment to form a hardening material layer, and the tunnel is advanced. A hardening material feed pipe having a first valve communicating with the inlet from the vertical shaft through the tunnel and a recovery pipe communicating with the inlet to the vertical shaft through the tunnel Then, after forming a hardening material layer on the tunnel wall surface, a plug is inserted into the hardening material feeding pipe on the vertical shaft side, and cleaning water is supplied to the back side of the plug so that the plug is hydraulically shielded. Pushes to the side and sends the hardened material remaining in the hardened material feed to the collection tube side, and removes the hardened material to the pit side through the collection tube, while sending the plug from the hardened material feed pipe to the collection tube side and the pit side Collect with A method for removing a hardened material in a hardened material supply pipe in a shield construction method, which is characterized in that 5. A separator having a hardening material passage and a plug passage is disposed behind the first valve of the hardening material feed pipe in the tunnel, and the stopper passage of the separator is provided as a first passage. The method for eliminating a hardened material in a hardened material supply pipe in a shield construction method according to claim 1 or 4, wherein the recovery material is connected and communicated with the recovery tube through a branch pipe having three valves. 6. An air intake is opened at a front end of the plug, and the stopper is captured and collected in the vacuum pump through a recovery pipe having a vacuum pump at the rear end, and the hardening material is discharged backward. The method for eliminating a hardened material in a hardened material supply pipe according to the seal construction method according to claim 1 or 4. 7. The separator comprises a short pipe having a diameter larger than that of a hardening material feed pipe located rearward of the separator, and a hardening material feed pipe located forward of the separator at a rear end of the peripheral wall portion. An inlet and an outlet that connect and communicate the rear hardening material supply pipe are provided respectively, and the rear end of the branch pipe having the same diameter as the hardening material supply pipe is penetrated watertightly from the front end to the inside. The projecting end portion is formed as a plug passage, and its opening is exposed from the outlet to the inlet on the rear side, and a space portion from the inlet to the outlet is formed in the hardening material passage. The method for removing a hardened material in a hardened material supply pipe in the shield construction method according to claim 5, wherein 8. A valve is automatically switched by arranging and interposing a magnetic concentration meter for a hardening material in a hardening material feed pipe on the rear side of the separator to distinguish between cleaning water and the hardening material. Claim 1 or claim 4 characterized in that
A method for removing a hardened material in a hardened material supply pipe in the shield construction method as described above.