JP2003343192A - Shield tunneling method and shield device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shield tunneling method and a shield device 1, which can control the pressure of a filler pressurized and injected from the shield device 1. <P>SOLUTION: This shield device 1 is provided with an exhaust port 16 which enables the forced discharge of the filler which is pressurized and injected into a gap between an outer peripheral surface of the shield device 1 and an excavated surface C1 of natural ground, and a forced discharge means 18 for enabling the filler to be forcedly discharged from the exhaust port 16. The filler, which is pressurized and injected into the gap between the outer peripheral surface of the shield device 1 and the excavated surface C1, is forcedly discharged by the shield device 1. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a shield construction method and a shield device. In detail, in the shield construction method and the shield device for filling the filler in the excess moat,
The present invention relates to a shield construction method and a shield device capable of managing the pressure of a squeeze portion during excavation.

[0002]

2. Description of the Related Art Conventionally, a shield method has been known as a method of creating a pipeline such as a tunnel or a tunnel in the ground. In this shield construction method, it is necessary to provide an extra excavation part which is a void necessary for passing the machine between the inner ring difference and the outer ring difference, especially in a curved part excavated by a shield machine that can be formed by excavating a tunnel. is there. The void portion, which is the extra excavation portion, may be required to be filled with a filler in order to prevent the ground material from collapsing due to the nature of the excavated material. Therefore, the applicant proposed in Japanese Patent Application No. 2001-109773 a "shielding method and a shield device" (hereinafter referred to as a conventional example) capable of forming a pipeline such as a tunnel by excavating while filling an appropriate amount of a filler in a slag. did. That is, in the conventional example, [[Claims] [Claim 1] A filler is pressurized and injected into a shield dug portion which is a gap between the outer peripheral surface of the shield device and the ground excavation surface. A shield construction method characterized in that a secondary injection and a secondary injection in which a curing agent for curing the filler is injected under pressure into the dug portion that has been primary injected are performed. [Claim 2] A primary injection for injecting a filling material under pressure into a shield dug portion, which is a void portion between the outer peripheral surface of the shield device and the ground excavation surface, and an extra dug injected further. A shield method characterized by performing a secondary injection in which a curing agent for curing the filler is injected under pressure at a pressure higher than the pressure held by the filler in the primary injection. [Claim 3] The shield margin portion, which is a void portion between the outer peripheral surface of the shield device and the ground excavation surface, has slow-hardening property that hardens with the passage of time, and the time until hardening further depends on the material. A shield construction method that uses a filler that can be set by selection. [Claim 4] The shield excess, which is a gap between the outer peripheral surface of the shield device and the ground excavation surface, has a slow hardening property that hardens over time from the shield machine located in the front part of the shield device. A shield construction method, which comprises firstly injecting a filling material, and then secondarily injecting a quick-linking backfill material into a shield dug portion from a segment ring installed behind a shield machine. [Claim 5] A shield construction method in which a filler is pressure-injected while maintaining a predetermined pressure in a shield dug portion which is a gap between the outer peripheral surface of the shield device and the ground excavation surface. [Claim 6] A primary injection for injecting a filling material under pressure into a shield dug portion, which is a void portion between the outer peripheral surface of the shield device and the ground excavation surface, and a further extra injected dug A shield construction method, characterized in that secondary injection in which a curing agent for injecting a filler into a portion is injected under pressure while maintaining a predetermined pressure. [Claim 7] A pressure sensor for measuring the pressure of a filler injection hole provided in the circumferential direction of the outer periphery of the shield device, and a shield overcut portion which is a gap between the outer peripheral surface of the shield device and the ground excavation surface. And a solenoid valve for controlling the supply of the filling material to the filling material injection hole, and a controller for comparing the pressure information received from the pressure sensor with a predetermined pressure to control the operation of the solenoid valve. . [Claim 8] A shield machine, a segment ring installed at the rear of the shield machine, and a bag formed in a bag shape and installed between the segment ring and the ground surface without shielding the entire outer circumference of the segment ring. And a filling material injection hole provided in the circumferential direction of the outer periphery of the shield machine, and a pressure sensor for measuring the pressure of the shield overdrilled portion which is a gap between the outer peripheral surface of the shield device and the ground excavated surface. A shield machine comprising: a solenoid valve for controlling the supply of the filling material to the filling material injection hole; and a controller for comparing the pressure information received from the pressure sensor with a predetermined pressure to control the operation of the solenoid valve. [Claim 9] A filling material injection hole provided in the circumferential direction of the outer circumference of the shield device, and an injection pressure is measured when the filling material is injected, and a surplus is measured when the injection is stopped. From the pressure sensor that measures the pressure of the part, the solenoid valve that controls the supply of the filling material to the filler injection hole, and the controller that controls the operation of the solenoid valve by comparing the pressure information received from the pressure sensor with the predetermined pressure. Shielding machine characterized by becoming. [Claim 10] The filler is injected into a filler injection hole provided in a circumferential direction of an outer periphery of the shield device, and a shield overexcavation portion which is a gap between an outer peripheral surface of the shield device and a ground excavation surface. If the pressure is measured, the injection pressure is measured, and if the injection is stopped, the pressure sensor that measures the pressure in the dug portion,
A pressure sensor that measures only the pressure in the excess area, a solenoid valve that controls the supply of filling material to the filling material injection hole, and the operation of the solenoid valve that compares the pressure information received from the pressure sensor with a predetermined pressure. A shield machine comprising a controller that operates. As shown in FIG. 8, when the shield machine 111 is excavating, a filler is injected from the shield machine 111 into a gap between the peripheral portion of the shield machine 111 and the ground, and a predetermined pressure is applied to the ground. The mine shaft shape is maintained, and the mine is built by continuously arranging the segments 113 in a cylindrical shape inside the rock mine formed on the rear side of the shield machine 111. Segment 1 to be installed at this time
Numeral 13 is bag-shaped segments 115 and 116 in which a bag-like material 114 is attached to the outer peripheral surface, and the back-filling material is pressure-injected into the bag-shaped material 114 of the back surface and 115 and 116, and the ground and the segment 11 are formed.
It kept a gap with 3. After that, the shield machine 11
In the gap between the surrounding area and the ground, a filler was injected from the shield machine 111 to reinforce the ground.

[0003]

However, in the conventional example, although the filling material filled between the ground excavated by the shield machine 111 and the peripheral portion of the shield machine 111 is pressure-controlled at the time of injection, Since it is not controlled later, the pressure of the filling material is constant, for example, the pressure held by the filling material when the backfill material is injected into the bag-shaped material 114 of the bagged segments 115 and 116 is locally increased. There was a problem that it could not be kept. Then, when the pressure of the filler becomes high, the ground is pressed more than necessary, which sometimes causes a problem that the ground rises.

Further, when the shield machine 111 has to be stopped for a long period of time, even if the filler is slow-hardening, it will be hardened and the shield machine 111 will be hardened.
Had the problem that he could not dig again.

In order to solve these problems, it is an object of the present invention to provide a shield construction method and a shield device capable of controlling the pressure of the filler injected under pressure from the shield device.

[0006]

Means for Solving the Problems

A shield construction method characterized in that it is possible to forcibly discharge the filler material injected under pressure into the gap between the outer peripheral surface of the shield device and the ground excavation surface,

Further, the filler can be injected under pressure into the gap between the outer peripheral surface of the shield device and the ground excavation surface, and the injected filler can be forcibly discharged,

In addition, when the pressure-injected filler in the gap between the outer peripheral surface of the shield device and the ground excavation surface exceeds a preset upper limit pressure, it can be forcibly discharged to a predetermined pressure. Characteristic shield construction method,

In addition, it is possible to pressurize and inject the filling material into the gap between the outer peripheral surface of the shield device and the ground excavation surface so that the filling material has a predetermined pressure, and the injected filling material exceeds the preset upper limit pressure. In the case, the shield construction method is characterized in that it can be forcibly discharged to a predetermined pressure,

Further, a discharge port for forcibly discharging the filling material injected under pressure is provided in the gap between the outer peripheral surface of the shield device and the ground excavation surface, and a compulsory discharging means for forcibly discharging the filling material from the discharge port. A shield device, characterized in that

A device for excavating by an excavation cutter provided on the front surface, which is connected to a filler injection port provided on the outer peripheral surface of the device and a filler injection port, and is provided in a gap between the outer peripheral surface of the device and the ground excavated surface. An injecting means capable of injecting the filling material under pressure, a forced discharge port provided on the outer peripheral surface of the device, and a filler material, which is connected to the forced discharge port and is injected into the gap between the outer peripheral surface of the device and the excavated ground, is forcibly discharged. A shield device comprising a possible forced discharge means,

A device for excavating forward by an excavation cutter provided on the front surface, which is connected to a filler injection port provided on the front outer peripheral surface of the device and a filler injection port, and an outer peripheral surface of the device and a ground excavation surface. The injection means capable of pressurizing and injecting the filler into the gap, the forced discharge port provided on the outer peripheral surface on the rear side of the device, and the filler injected into the gap between the outer peripheral face of the device and the ground excavation surface connected to the forced discharge port A shield device comprising a forced discharge means capable of forcibly discharging

A device for excavating by a digging cutter provided on the front surface, which is connected to the suction pressure sensor capable of detecting the pressure on the outer peripheral surface of the device, the forced discharge port provided on the outer peripheral surface of the device, and the forced discharge port. The forced discharge means is capable of forcibly discharging the filler injected into the gap between the outer peripheral surface and the rock excavation surface, and the forced discharge means is the gap between the device outer peripheral surface sensed by the suction sensor and the rock excavation surface. When the pressure of the filler injected under pressure exceeds a preset upper limit pressure, the shield device is forcibly discharged to a predetermined pressure,

A device for excavating by an excavation cutter provided on the front surface, which is connected to a filler injection port provided on the outer peripheral surface of the device and a filler injection port, and is provided in a gap between the outer peripheral surface of the device and the ground excavated surface. An injecting means capable of pressurizing and injecting the filler, a suction pressure sensor capable of detecting the pressure on the outer peripheral surface of the device, a forced discharge port provided on the outer peripheral face of the device, and an outer peripheral face of the device and a ground excavated surface connected to the forced discharge port And a forced discharging means capable of forcibly discharging the filling material injected into the gap between the filling means and the filling means. The filling means can fill the filling material with a predetermined pressure, and the forced discharging means is the outer circumference of the device sensed by the suction sensor. When the pressure of the filling material pressurized and injected into the gap between the surface and the ground excavation surface exceeds a preset upper limit pressure, the shield device is forcibly discharged to a predetermined pressure,

A device for excavating forward by an excavation cutter provided on the front side, which is connected to a filler injection port provided on the front outer peripheral surface of the device and a filler injection port, and an outer peripheral surface of the device and a ground excavation surface. The injection means capable of pressurizing and injecting the filling material into the gap, the suction pressure sensor capable of sensing the pressure on the rear outer peripheral surface of the device, the forced discharge port provided on the outer peripheral surface of the device, and the outer peripheral surface of the device connected to the forced discharge port. The filling material injected into the gap between the ground excavation surface and the forced discharge means capable of forcibly discharging the filling material, and the filling means can fill the filling material at a predetermined pressure.
The forced discharge means forcibly discharges a predetermined pressure when the pressure of the filling material injected into the gap between the outer peripheral surface of the device sensed by the suction sensor and the ground excavation surface exceeds a preset upper limit pressure. A shield device characterized by

[0017] is provided. The operation of the present invention is as follows. The shield device is excavated by a front excavation cutter. Then, the injection means injects the filler into the gap between the shield device and the ground excavation surface from the filler injection port provided on the outer peripheral surface of the shield device.

When the filler injected into the gap between the shield device and the ground excavation surface is removed, the forced discharge means forcibly sucks the injected filler material from the forced discharge port provided on the outer peripheral surface of the shield device. Discharge. As a result, the filler injected into the gap between the shield device and the ground excavation surface can be forcibly removed.

Further, in the shield device in which the filler injection port is provided in front of the outer peripheral surface of the shield device and the forced discharge port is provided in the rear of the outer peripheral surface of the shield device, when the filler is injected, the shield device and the ground are introduced from the front of the device. Inject into the gap on the excavated surface of the mountain,
When discharging the filler injected into the gap between the shield device and the ground excavation surface, it is forcibly discharged from the rear of the device. As a result, at the time of injecting the filler, the filler will be filled into the gap between the shield device and the ground excavation surface shortly after excavation at the front of the shield device, and the addition to the excavated ground excavation surface will be completed. Smooth pressure reinforcement. Furthermore, when the filling material is forcibly discharged, since the forced discharge port is at the rear of the device, the pressure in the gap between the shield device and the ground excavation surface can be made stable across the shield device.

Further, in the shield device provided with the suction pressure sensor for sensing the pressure on the outer peripheral surface, the pressure of the filler injected under pressure by the suction pressure sensor into the gap between the outer peripheral surface of the device and the ground excavation surface is preset. When the upper limit pressure is exceeded, the forced discharge means forcibly discharges the filling material from the forced discharge port to a predetermined pressure.
This makes it possible to adjust the pressure of the injected filler to a predetermined pressure.

Furthermore, in addition to the forced suction when the pressure exceeds a predetermined pressure by the suction sensor, the filling means fills the filling material from the filling material inlet into the gap between the shield device and the ground excavation surface with a predetermined pressure. To do. Thereby, it becomes possible to inject with a better pressure even when injecting the filler. By providing the filler injection port in front of the shield device and the forced discharge port and suction sensor behind the shield device, the pressure of the filler injected into the gap between the shield device and the ground excavation surface can be maintained over the entire shield device. , Can be in better condition.

[0022]

Embodiments of the present invention will be described below with reference to the drawings. 1 is an explanatory diagram showing an embodiment of the present invention, FIG. 2 is a partial detailed explanatory diagram of FIG. 1, FIG. 3 is a central longitudinal sectional explanatory diagram of FIG. 2, and FIG. 4 is another exemplary embodiment. 6 is an explanatory view showing a form, FIG. 5 is a cross-sectional explanatory view explaining an internal mechanism of the embodiment of the present invention, and FIG.
FIG. 7 is an explanatory view showing a state of excavation, and FIG. 7 is an explanatory view of a central longitudinal section of FIG.

1 is a shield device according to an embodiment of the present invention. The shield device 1 is, as shown in FIG.
A desired excavation shaft C is excavated by a shield excavator 2 that excavates the underground by a excavation cutter provided on the front surface to form a tunnel, and a segment ring S is sequentially placed at the end of excavation.
Is a device for excavating the shield pit A by installing. The shield device 1 includes a shield machine 2 and a segment ring S.
It consists of and. Then, the shield machine 2 is rotated in such a manner that the outer shell 3 becomes the outermost wall when excavating the horizontal shaft C and receives an external force from the horizontal shaft C, and the opening of the outer shell 3 is closed at the tip of the external shell 3. A hydraulic motor that is a cutter driving means, a screw conveyor unit that is an excavating soil discharging means that discharges the excavated soil excavated by the excavating cutter 4, and an excavated horizontal shaft C. The erector that fixes the segment ring S to the inner wall to construct the shield pit S, and the shield jack that is the digging means that obtains the reaction force that advances the shield digger 2 from the segment ring S are fixed and configured. The shield device 1 is not a description of the excavation of the shield machine 2 according to the embodiment.
Since the description is about the filling of the filling material to be injected under pressure into the outer body peripheral portion, the devices relating to the excavation will not be described in detail and the illustration thereof will be omitted. In this embodiment, the shield machine 2 can be bent at an intermediate portion of the outer shell 3, and the shield machine 2 can be bent, so that the excavation diameter of the curved portion of the shield pit A can be made smaller. Of course, the shield machine 2 may be composed of the outer case 3 which cannot be bent.

Reference numeral 3a is a filler backflow prevention device. The filler backflow prevention device 3a is installed over the outer circumferential surface of the outer barrel 3 on the excavation side, and is provided so as to contact the natural excavation surface C in a ring shape from the outer barrel 3 to the rearward side of the excavation. The filling material backflow prevention device 3a prevents the filling material filled in the shield extra trench C2, which is a gap between the outer shell 3 behind the filling material backflow prevention device 3a and the natural ground excavation surface C, from wrapping around to the excavation cutter 4 side. This is a device for preventing, and it is possible to keep contact with the natural excavation surface C so that the filler does not rotate toward the excavation cutter 4 at least with a predetermined pressure of the filler with which the shield excess portion C2 is filled.

In this embodiment, the segment ring S
Is fixed by combining the ring pieces of the segment ring S formed by dividing the shield pit A into 6 in the excavated horizontal shaft C, and continuously fixing the ring pieces in the horizontal shaft C in the excavation direction. Make up. In this embodiment,
The segment ring S is formed by combining the ring pieces divided into six, but depending on the diameter of the shield pit A to be constructed, etc., the number of ring pieces can be selected from three or nine, and other segments can be selected. The ring S may be formed.

The details of constructing the segment ring S in the shield shaft A will be described below. The segment ring S is
As shown in FIG. 2, the shield device 1 is sequentially installed behind the shield machine 2 to form a cylindrical shape. A plurality of segment rings S are continuously connected. The segments constituting the segment ring S include a normal segment S1 whose outer surface is exposed to the metal surface, a bag-like segment S3 in which a bag-like object S2 is attached to the outer peripheral surface of the metal surface and is inflated as necessary, and a bag A bag-like object S2 smaller than the attached segment S3 is formed on the outer peripheral surface and is inflated as necessary, and the segment S3 and S4 with the bag can be selectively used depending on the shield pit C to be excavated. The bag segments S3 and S4 are bag-like objects S
2 is installed between the segment ring S and the ground excavation surface C1.

For example, when the segment ring S is formed by the ordinary segment S1 and the partially opened bagged segment S4, as shown in FIGS.
An open portion S5 that is opened is formed between the segment ring S and the ground excavation surface C. Although not shown, the opening S5 is not formed when the segment ring S is formed of the bag-equipped segment S3 over the entire circumference in the outer peripheral direction.

As described above, the shield pit A has the shield device in the state where the space between the excavated natural ground excavation surface C1 and the segment ring S is formed by the bag-shaped material S2 including the bag segment S3 and the bag segment S4. 1 to rock excavation surface C
A filler is pressure-injected into the gap between 1 and the segment ring S to impregnate the ground excavation surface C to reinforce and to form the segment ring S and the ground excavation surface C by fixing.

Therefore, the filling material pressure injection mechanism of the shield device 1 will be described below. Reference numeral 5 is a filler injection port. A plurality of filler injection ports 5 are provided on the outer peripheral surface of the shield device 1 at regular intervals.

The filler injection port 6 is also provided on the outer peripheral surface of the segment ring S at regular intervals. Alternatively, the filler injection port 6 is installed only in a necessary portion of the segment ring S, and the filler injection pipe 9 provided in the shield device 1 is installed.
A filler may be conveyed by connecting and connecting a pipe from the pipe. From the filler injection port 6, a filler or a curing agent is injected instead of the filler.

Reference numeral 7 is a filler injection pipe, 8 is a solenoid valve, 9 is a filler injection pipe, and 10 is a distribution pipe. The filling material injection pipe 7 is connected to an injection pump (not shown) on the upstream side to convey the filling material. The filler injection pipe 9 is connected to the filler supply pipe 7 on the upstream side via a solenoid valve 8. The downstream side of the distribution pipe 10 is divided by the distribution pipe 10. The opening of the distribution pipe 10 is formed with the filler injection port 5 or the filler injection port 6. Further, the check valve 1 is provided at the filler injection port 5 and the filler injection port 6.
1 is set. Therefore, the shield moat portion C2, which is a space between the outer peripheral surface of the shield device 1 and the ground excavation surface C1,
Filler injection port 5 and checkpoint 6 provided with check valve 11
Is in an open state.

Reference numeral 12 is a pressure detecting hole. Pressure detection hole 1
2 is a distribution pipe in which the check valve 11 is not installed.

Reference numerals 13 and 14 are pressure sensors. The pressure sensor 13 is connected to the filler injection pipe 9 and can detect the pressure in the filler injection pipe 9. Therefore, the pressure sensor 13 can detect the pressure of the filler injected under pressure from the filler injection port 5 via the inside of the injection pipe 9. The pressure sensor 14 can directly detect the pressure in the shield extraneous portion C2, which is a space between the outer peripheral surface of the shield device and the ground excavation surface 21, without the interposition of the filler injection pipe 9.

In this embodiment, the pressure sensors 13, 1
Although a plurality of 4 are provided, as shown in FIG. 5, when the filling material is injected by one injection pump (not shown),
Only one pressure sensor 13 may be provided and the pressure sensor 14 may not be provided, and the injection pressure may be measured when the filling material is injected, and the pressure outside the shield machine may be measured when the filling material is not injected. Further, although a plurality of pressure sensors 14 are provided in this embodiment, only one pressure sensor 14 may be provided so as to measure the pressure of the sunk portion C2 outside the shield device 1 of the pressure sensor 13. Furthermore, the pressure sensor 14 and the pressure detection hole 12 may be freely installed regardless of the position of the filler injection tube 9.

When the pressure sensor 13 and the pressure detection hole 12 are combined only with the injection device, for example, when the permeability of the ground is large, the detection hole is located far away from the ground of the filling material. It may not be possible to control the pressure drop due to osmosis. Therefore, the pressure control can be performed over the entire length of the shield device by installing it at a free position and installing a plurality of injection holes according to the nature of the ground.

The pressure sensor 14 and the pressure detection hole 12 are freely installed regardless of the position of the filler injection pipe 9. That is, the filling material injection pipe 9 can measure the injection pressure when the filling material is being injected, and can measure the pressure of the sunk portion C2 when the injection is stopped, and each has two roles. The pressure sensor 13 that fulfills the above is installed. As shown in FIG. 5, a pressure sensor 14 for measuring only the pressure of the sunk portion C2 is installed, and the pressure sensor 14 and the pressure detection hole 12 are freely installed regardless of the position of the filler injection pipe 9. May be.

By installing a plurality of pressure sensors 13 and 14 at arbitrary positions, it becomes possible to detect the pressure according to the nature of the natural ground. Reference numeral 15 is a control device. The control device 15 includes a control means such as a computer device, and the pressure sensor 13, the pressure sensor 14,
The solenoid valve 8 is connected to an infusion pump (not shown). The control device 15 can control the operations of the injection pump (not shown) and the solenoid valve 8 by comparing the predetermined pressure stored in advance with the pressure information received from the pressure sensors 13 and 14.

Infusion pump (not shown) in this embodiment
As the filler supplied from the filler to the filler injection ports 5 and 6,
There is a filling material / hardening agent, etc., and as the filling material supplied from the injection pump (not shown) to the filling material injection hole 5, a cement-based or slag / lime-based material is used as a hardening agent, and gelation occurs. Promotes lime, gypsum, inorganic salts, etc. as accelerators.

Further, as the material having slow hardening property, for example, lignin sulfonic acid type, hydroxycarboxylic acid type,
Acids containing oxycarboxylic acid as a main component are used.

In this embodiment, as the curing agent supplied from the injection pump to the filler injection port 6, water glass, aluminum salt solution or the like is used. As a quick-setting backfill material,
A cement-based or slag / lime-based material is used as a hardening agent, and a clay mineral such as bentonite is used to improve fluidity. Further, in order to provide the instantaneous binding property, for example, a mixture of water glass type silicic acid is used. The curing time is selected by selecting the mixing ratio of these fillers and curing agents.

A primary injection for injecting a filler material into a shield extra part C2 which is a space between the outer peripheral surface of the shield device 1 and the ground excavation surface C1 and a shield extra part C2 for the primary injection. In the case of performing the secondary injection in which the curing agent for curing the filler is injected under pressure at a pressure higher than the pressure held by the filler in the primary injection, in the shield moat portion C2, 1
By injecting the hardening agent for the secondary injection at a pressure higher than the pressure held by the filling material for the next injection, the penetration of the hardening agent into the ground becomes easy. It is possible to cure the filler without removing the filler that has been primarily injected into the overdug portion.

A filler having a slow-hardening property that hardens with the passage of time is first injected from the shield machine 2 into the shield margin C2 which is a space between the outer peripheral surface of the shield device 1 and the ground excavation surface C1. Then, when the shield construction method is used in which the flashing backing material is secondarily injected from the segment ring S installed at the rear of the shield machine 2 into the shield excess excavation portion C2, depending on the situation of the ground, slow-acting filling is performed. The material permeates into the ground and is pre-pressurized to prevent the formation of voids when the filling material hardens, so that the material permeates into the ground.

The filler to be filled in the shield margin portion C2, which is the space between the outer peripheral surface of the shield device 1 and the ground excavation surface C1, has a slow-hardening property that hardens with the passage of time, and until it hardens further. When the time can be set by selecting the material, the time until the filler injected into the shield dug portion C2 is hardened can be appropriately set by selecting the material.

Primary injecting the filler material is performed in the shield moat C2, which is a space between the outer peripheral surface of the shield device 1 and the ground excavation surface 21, and the shield moat is further injected. When performing the secondary injection of injecting the curing agent to the C2 under pressure and the secondary injection while maintaining the respective predetermined pressures, the filler is cured without removing the primary injection material into the shield margin C2. In addition to this, it is possible to inject the filler into the shield margin C2 at a predetermined pressure.

When the control device 15 controls the operation of the solenoid valve 8 by comparing the pressure information received from the pressure sensor 13 with a predetermined pressure, when the pressure detected by the pressure sensor 13 is higher than the predetermined pressure, an electromagnetic The valve 8 is closed to stop the injection of the filling material into the shield margin portion C2. When the pressure becomes equal to or lower than a predetermined pressure, the solenoid valve 8 is opened and the filler is injected into the shield excavation portion C2. Therefore, the control device 15
By controlling the solenoid valve 8 with, it becomes possible to efficiently inject the filler into the shield trench C2, and it is possible to maintain the pressure outside the shield machine 2 within a certain range.

Reference numeral 16 is a forced discharge port, 17 is a filler suction pipe, 18 is a suction pump, 19 is a suction pressure sensor, and 20 is a check valve. Forced outlet 1
As shown in FIGS. 6 and 7, 6 is opened in a segment ring S formed in the rear part of the shield machine 2.

The forced discharge port 16 may be provided in a plural number or a single number. In this embodiment, five locations are provided on the same segment ring S, but the number of the forcible discharge ports 16 provided may be different depending on the shield pit A to be excavated and is not particularly limited.

The filler suction pipe 17 is provided with a forced discharge port 16.
And the suction pump 18 are connected to each other and installed inside the segment ring S.

The suction pump 18 is installed in the segment ring S and is connected to the control device 15. Then, the suction pump 18 operates according to an instruction signal from the control device 15. The filling material suction pipe 17 is installed in the segment ring S, and the filling material suction pipe 16 is provided for forcing the filling material filled in the shield excess portion C2, which is a gap between the ground excavation surface C and the shield device 1, from the forced discharge port 16. Can be aspirated via.

The suction pressure sensor 19 is installed in the middle portion of the filling material suction pipe 17, and can measure the pressure according to an instruction from the control device 15 and also has the control device 15.
Is connected so that the sensed pressure information can be output. Then, the suction pressure sensor 19 can detect the pressure in the shield trench C2, which is the pressure outside the forced discharge port 16. Therefore, the suction pressure sensor 19 is installed relatively close to the forced suction port 16 side of the filler suction pipe 17. When a plurality of the forced discharge ports 16 are installed, a plurality of the suction pressure sensors 19 may be installed in accordance with the installation of the forced discharge ports 16. By installing a plurality of the suction pressure sensors 19, the control device 15 can more accurately control the pressure in the shield pit C2. In addition to being measurable, it is possible to detect the pressure difference due to the shield extra portion C2.

Next, the operation of this embodiment will be described. It should be noted that in the description, the shield extra portion C shown in FIG.
In the description, it is assumed that the shielding material C2a of 2 is completely filled with the filler and cured.

While the shield machine 2 is excavating, the filler is injected from the filler injection port 5 provided in the shield machine 2.
At this time, the injection pressure is controlled by the control device 15 by the pressure of the shield excavator C2 which is the peripheral portion of the shield machine 2 detected by the pressure sensors 13 and 14, and the solenoid valve 8 is opened and closed during injection. The filler will be injected into the shield trench C2.

The filling pressure of the filler is such that the pressure measured by the pressure sensors 13 and 14 at the shield margin C2 falls within a predetermined pressure range. This predetermined pressure is, for example, when the face soil pressure is P0 and the predetermined pressure is P1,

P0-0.1 (Mpa) ≤P1≤P0 +
0.1 (Mpa)

The pressure is such that, and the pressure is controlled to fall within this pressure range. As the filler to be injected at this time, a slow-curing, slow-hardening filler having a relatively slow curing speed, which matches the digging speed of the shield machine 2, is adopted.

When this slow-hardening filler is injected, the bag segment S3a including the shield moat C2a that has been injected and cured has already been cured, so that the bag segment S3b, which is in front of the bag segment S3a, is In the state, the filling material is filled with a predetermined pressure and is not cured.

In this state, an instantaneous binding backing material is injected into the bag-attached segment S3b to form the bag-attached segment S3.
Similarly to a, the ground excavation surface C is reached and hardened. Then,
The filler in the shield moat C2b between the bag segment S3a and the bag segment S3b is prevented by the bag segment S3b from entering the shield moat C2c that is further in front.

When the quick-setting backing material is injected into the bag-like material S2 of the bag-equipped segment S3b, the pressure of the filling material filled in the shield moat portion C2b and the shield moat portion C2c becomes the bag-like material. When the pressure in the shield trench C2 exceeds the pressure range of the predetermined pressure due to the expansion of S2, such as when it exceeds the pressure range of the predetermined pressure expressed by the mathematical expression, the suction pressure sensor 19 detects the pressure. Since it is sensing, a pressure signal exceeding the pressure range is output to the control device 15.

Then, in the control device 15, since the pressure exceeds the predetermined pressure, the suction pump 18 is instructed to suction. The suction pump 18 starts suction. Then, the filler in the shield excess portion C2 is sucked from the forced discharge port 16.

Since the suction pump 18 sucks, the pressure in the shield trench C2 drops, and eventually reaches a predetermined pressure. Then, since the control device 15 inputs the pressure signal which has become the predetermined pressure sensed by the suction pressure sensor 19, the control device 15 instructs the suction pump 18 to end the suction. Then, the suction pump 18 ends the suction.

By this series of operations, the pressure in the shield trench C2 can be maintained within a predetermined pressure range.

The control device 15 is the suction pump 1
The pressure at which suction by 8 ends is not the upper limit of the pressure range of the predetermined pressure, but is set to P1 of the above-described mathematical expression, so that immediately after the end of suction by the suction pump 18, the pressure reaches the upper limit of the pressure range of the predetermined pressure. It is possible to avoid the phenomenon of exceeding.

As described above, when the shield machine 2 is constructing the segment ring S while excavating, it is possible to set the pressure of the shield digging portion C2 within a predetermined pressure range. If the pressure range of the predetermined pressure is reduced, the number of operations of the suction pump 18 increases, but better pressure control becomes possible.

Incidentally, the case where the pressure of the filling material in the shield extra portion C2 becomes lower than the lower limit of the pressure range of the predetermined pressure is carried out by the conventional technique, so that it will not be described in detail, but the pressure sensor 13 and the pressure sensor are not described in detail. When the measured pressure of 14 is equal to or lower than the lower limit of the pressure range of the filling material, the control device 15 controls the opening degree of the solenoid valve 8 to shield the shield margin until the filling material pressure reaches the predetermined pressure. Fill C2 with more filler.

Next, due to the exchanging of the excavation cutter 4 or the failure of the drive unit of the shield machine 2, the shield machine 2 cannot be stopped in the shield pit A during excavation for a long time.
If it is necessary to stop the above, if the filler filled in the shield extra-cavity portion C2 is hardened although it is a slow-hardening filler, there is a problem that the shield machine 2 cannot dig again. The case of avoiding this problem will be described below.

When the shield machine 2 is stopped for a long period of time, the control device 15 is operated and the suction pump 18 is operated to suck the slow-hardening filler filled in the shield trench C2 from the forced discharge port 16. On the other hand, the non-curable filler is filled from the filler injection port 5 and the filler injection port 6 by an injection pump (not shown). At this time, the control device 15 keeps the pressure inside the shield trench C2 within a predetermined pressure range based on the values of the respective pressure signals input from the pressure sensor 13, the pressure sensor 14, and the suction pressure sensor 19. Filling and suction at the same time.

By continuing this work, the slow-hardening filling material filled in the shield moat C2 eventually replaces the non-hardening filler, and the filling material in the shield moat C2 does not harden, so that the shield digging progresses. Machine 2 can be driven again and restarting the excavation.

[0068]

Therefore, according to the present invention, the pressure of the filling material with which the shield moat is filled can be maintained at a predetermined pressure, so that the excavation cutter that goes beyond the uplift of the ground and the filling material backflow prevention device. It is possible to solve the problem caused by the pressure of the filler being too high, such as the wraparound of the filler to the side.

Further, while it is possible to fill a new filling material while sucking the filling material filled in the shield dug portion and control the pressure at the time of suction and filling, while keeping the pressure in the shield dug portion at a predetermined pressure. The filler once filled can be replaced with a new filler, and even if the excavation of the shield device in the shield pit A is stopped, it is possible to prevent the filler from hardening around the shield device.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention.

FIG. 2 is a partial detailed explanatory diagram of FIG.

FIG. 3 is an explanatory view of a vertical section in the center of FIG.

FIG. 4 is an explanatory diagram showing another embodiment of FIG.

FIG. 5 is a sectional explanatory view illustrating an internal mechanism according to the embodiment of the present invention.

FIG. 6 is an explanatory diagram showing a digging state.

7 is an explanatory view of a vertical cross section of FIG.

FIG. 8 Conventional example diagram

[Explanation of symbols]

A shield pit C side pit C1 Ground excavation surface C2 shield overhang S segment ring S1 Normal segment S2 bag S3 bag segment S4 bag segment S5 open part 1 Shield device 2 shield machine 3 outer body 3a Filler backflow prevention device 4 drilling cutter 5 Filling material injection port 6 Filling material injection port 7 Filling material injection pipe 8 solenoid valve 9 Filling material injection pipe 10 minute piping 11 Check valve 12 Pressure detection hole 13 Pressure sensor 14 Pressure sensor 15 Control device 16 Forced outlet 17 Filling material suction pipe 18 Suction pump 19 Suction pressure sensor

Claims (10)

[Claims] 1. A shield construction method characterized in that it is possible to forcibly discharge a filler material injected under pressure into the gap between the outer peripheral surface of the shield device and the ground excavation surface. 2. A shield construction method characterized in that the filler can be injected under pressure into the gap between the outer peripheral surface of the shield device and the ground excavation surface, and the injected filler can be forcibly discharged. 3. When the filler injected under pressure into the gap between the outer peripheral surface of the shield device and the ground excavation surface exceeds a preset upper limit pressure, it can be forcibly discharged to a predetermined pressure. Characteristic shield construction method. 4. The filler can be pressurized and injected into the gap between the outer peripheral surface of the shield device and the rock excavation surface so that the filler has a predetermined pressure, and the injected filler exceeds a preset upper limit pressure. In some cases, the shield construction method is characterized in that it can be forcibly discharged to a predetermined pressure. 5. A forced discharge means capable of forcibly discharging the filler injected under pressure in the gap between the outer peripheral surface of the shield device and the ground excavation surface and forcibly discharging the filler from the outlet. A shield device characterized by being provided. 6. A device for excavating by a digging cutter provided on a front surface, comprising a filler injection port provided on an outer peripheral surface of the device,
An injection means that is connected to the filler injection port and can inject the filler under pressure into the gap between the outer peripheral surface of the device and the ground excavation surface, a forced discharge port provided on the outer peripheral surface of the device, and an outer periphery of the device connected to the forced discharge port. A shield device comprising: a forced discharging means capable of forcibly discharging the filler injected into the gap between the ground surface and the ground excavation surface. 7. A device for excavating forward by an excavation cutter provided on a front surface, comprising a filler injection port provided on the front outer peripheral surface of the device and a filler injection port, and an outer peripheral surface of the device and a ground excavation surface. An injection means capable of injecting a filler into the gap of
It is composed of a forced discharge port provided on the outer peripheral surface on the rear side of the device, and a forced discharge means connected to the forced discharge port and capable of forcibly discharging the filler injected into the gap between the outer peripheral surface of the device and the ground excavation surface. Characteristic shield device. 8. A device for excavating by an excavation cutter provided on the front surface, the device being connected to a suction pressure sensor capable of sensing the pressure on the outer peripheral surface of the device, a forced discharge port provided on the outer peripheral face of the device, and a forced discharge port. The forced discharge means is capable of forcibly discharging the filler injected into the gap between the outer peripheral surface and the rock excavation surface, and the forced discharge means is the gap between the device outer peripheral surface sensed by the suction sensor and the rock excavation surface. A shield device, wherein when the pressure of the filler injected under pressure exceeds a preset upper limit pressure, the filler is forcibly discharged to a predetermined pressure. 9. A device for excavating by an excavation cutter provided on a front surface, comprising a filler injection port provided on an outer peripheral surface of the device,
An injection means that is connected to the filling material injection port and can inject the filling material into the gap between the outer peripheral surface of the device and the ground excavation surface, a suction pressure sensor that can detect the pressure of the outer peripheral surface of the device, and an outer peripheral surface of the device. It comprises a forced discharge port provided, and a forced discharge means connected to the forced discharge port and capable of forcibly discharging the filler injected into the gap between the device outer peripheral surface and the ground excavation surface. It is possible to fill at a predetermined pressure specified, and the forced discharge means is provided when the pressure of the filler injected under pressure into the gap between the device outer peripheral surface sensed by the suction sensor and the rock excavation surface exceeds the preset upper limit pressure. Is a shield device that is forcibly discharged to a predetermined pressure. 10. An apparatus for excavating forward by an excavation cutter provided on the front surface, comprising a filler injection port provided on the front outer peripheral surface of the device, and a filler injection port, and an outer peripheral surface of the device and a ground excavation surface. The injection means capable of pressurizing and injecting the filling material into the gap, the suction pressure sensor capable of sensing the pressure on the rear outer peripheral surface of the device, the forced discharge port provided on the outer peripheral surface of the device, and the outer peripheral surface of the device connected to the forced discharge port. The filling material injected into the gap between the ground excavation surface and the forced discharge means capable of forcibly discharging the filling material, and the filling means can fill the filling material at a predetermined pressure.
The forced discharge means forcibly discharges a predetermined pressure when the pressure of the filling material injected into the gap between the outer peripheral surface of the device sensed by the suction sensor and the ground excavation surface exceeds a preset upper limit pressure. A shield device characterized by: