JP3747012B2 - Shielding method, shield device, and filler pressure control device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shield method and a shield device. More specifically, the present invention relates to a shield method and a shield apparatus that can manage the pressure of an extra moat portion during excavation in a shield method and a shield device that fills the extra moat portion with a filler.
[0002]
[Prior art]
Conventionally, a shield method is known as a method for creating a pipe such as a tunnel or a tunnel in the ground.
In this shield method, it is necessary to provide an extra excavation part, which is a gap necessary for passing the machine between the inner ring difference and the outer ring difference, particularly in the curved part excavated by a shield machine that can be formed by excavating a tunnel. is there. In order to avoid the collapse of the natural ground due to the nature of the excavated natural ground, it may be necessary to fill the void which is the surplus excavated portion with a filler. Therefore, the applicant proposed in Japanese Patent Application No. 2001-109773 “Shield Method and Shield Device” (hereinafter referred to as a conventional example) capable of forming a conduit such as a tunnel by digging while filling an appropriate amount of filler in the extra moat. did.
That is, the conventional example is
“[Claims]
[Claim 1] Primary injection for pressurizing and injecting a filler into a shield surplus portion, which is a gap between the outer peripheral surface of the shield device and a natural ground excavation surface, and further surplus excavated primary. And a secondary injection for pressurizing and injecting a curing agent for curing the filler into the part.
[Claim 2] Primary injection for pressurizing and injecting a filler into the shield surplus portion, which is a gap between the outer peripheral surface of the shield device and the ground excavation surface, and the surplus excavation after the primary injection And a secondary injection in which a curing agent for curing the filler in the part is injected under pressure at a pressure larger than the pressure held by the filler for the primary injection.
[Claim 3] The shield surplus portion, which is a gap between the outer peripheral surface of the shield device and the ground excavation surface, has a slow-curing property that cures with time, and further increases the time until the material is cured. A shielding method characterized by using a filler that can be set by selection.
[Claim 4] The shield surplus portion, which is a gap between the outer peripheral surface of the shield device and the ground excavation surface, has a slow hardness that hardens with time from a shield machine located in front of the shield device. A shielding method characterized by firstly injecting a filler, and then secondarily injecting a quick-set backering material into a shield excavation from a segment ring installed behind the shield machine.
[Claim 5] A shield construction method in which a filler is pressurized and injected into a shield surplus portion, which is a gap between the outer peripheral surface of the shield device and a ground excavation surface, while maintaining a predetermined pressure.
[Claim 6] Primary injection for pressurizing and injecting a filler into the shield surplus portion, which is a gap between the outer peripheral surface of the shield device and the ground excavation surface, and the surplus excavation after the primary injection A shield method characterized by performing a secondary injection for pressurizing and injecting a curing agent for curing the filler into the part while maintaining a predetermined pressure.
[Claim 7] A pressure sensor for measuring a pressure of a filler injection hole provided in a circumferential direction of the outer periphery of the shield device and a shield excavation portion which is a gap between the outer peripheral surface of the shield device and the natural excavation surface. And a solenoid valve for controlling the supply of the filler to the filler injection hole, and a controller for controlling the operation of the solenoid valve by comparing pressure information received from the pressure sensor with a predetermined pressure. .
[Claim 8] A shield machine, a segment ring installed at the rear of the shield machine, and a bag that is formed in a bag shape and is not covered between the segment ring and the ground surface without shielding the entire outer periphery of the segment ring. A pressure sensor for measuring the pressure of the shield excavation part, which is a gap between the outer peripheral surface of the shield device and the natural excavation surface, and a filler injection hole provided in the circumferential direction of the outer periphery of the shield machine A shield machine comprising: an electromagnetic valve for controlling the supply of a filler to the filler injection hole; and a controller for controlling the operation of the electromagnetic valve by comparing pressure information received from a pressure sensor with a predetermined pressure.
[Claim 9] The filler injection hole provided in the circumferential direction of the outer periphery of the shield device, and the injection pressure is measured when the filler is injected, and the injection is stopped when the injection is stopped. A pressure sensor for measuring the pressure of the part, an electromagnetic valve for controlling the supply of the filling material to the filler injection hole, and a controller for controlling the operation of the electromagnetic valve by comparing pressure information received from the pressure sensor with a predetermined pressure A shielding machine characterized by
[Claim 10] Filler is injected into a filler injection hole provided in the circumferential direction of the outer periphery of the shield device and a shield excavation portion which is a gap between the outer peripheral surface of the shield device and the ground excavation surface. The pressure sensor that measures the injection pressure when the injection is stopped, the pressure sensor that measures the pressure of the surplus area, the pressure sensor that measures only the pressure of the surplus area, and the filler injection hole A shield machine comprising: an electromagnetic valve that controls the supply of a filler to a gas; and a controller that controls the operation of the electromagnetic valve by comparing pressure information received from a pressure sensor with a predetermined pressure. ]
As shown in FIG. 8, when the shield machine 111 digs, a filler is injected from the shield machine 111 into the gap between the shield machine 111 and the surrounding ground to apply a predetermined pressure to the ground. In addition, the shape of the shaft of the underground mine is maintained, and the mine is constructed by continuously arranging the segments 113 in a cylindrical shape inside the underground mine formed on the rear side of the shield machine 111. At this time, the segment 113 to be installed is a bag-attached segment 115 and 116 with a bag-like object 114 attached to the outer peripheral surface, and a backfill material is pressurized and injected into the bag-like substance 114 of the back surface 115 and 116. A gap with the segment 113 was maintained. Thereafter, the gap between the periphery of the shield machine 111 and the natural ground was reinforced by injecting filler from the shield machine 111.
[0003]
[Problems to be solved by the invention]
However, in the conventional example, the filling material filled between the natural ground excavated by the shield machine 111 and the periphery of the shield machine 111 is pressure-controlled at the time of injection, but is not controlled after the injection. There is a problem that the pressure of the filler cannot be kept constant, for example, the pressure held by the filler when the backfill material is injected into the bag-like material 114 of the segments 115 and 116 is locally increased. did. When the pressure of the filler is increased, there is a case where the ground is raised more than necessary and sometimes the ground is raised.
[0004]
Furthermore, when the case where the shield machine 111 has to be stopped for a long period of time has occurred, there is a problem that even if the filler is slow-hardening, the shield machine 111 is hardened and the shield machine 111 cannot be dug again. .
[0005]
In order to solve these problems, an object of the present invention is to provide a shield method and a shield device capable of controlling the pressure of a filler injected by pressure from the shield device.
[0006]
[Means for Solving the Problems]
This invention
[0009]
  In the device used for the shield method that injects the filler into the gap between the outer peripheral surface of the shield device and the ground excavation surface that occurs in the surplus,
  The segment ring is provided with a discharge port capable of forcibly discharging the filler injected into the gap between the segment ring behind the shield device and the ground excavation surface, and the filler is forcibly sucked from the discharge port. A pressure control device for the filler, characterized by providing forcible discharge means capable of being discharged
[0010]
  as well as,
  In the device used for the shield method that injects the filler into the gap between the outer peripheral surface of the shield device and the ground excavation surface that occurs in the surplus,
A pressure sensor for sensing the pressure of the injected filler near the outer peripheral surface of the segment ring behind the shield device, and the filler connected to a forced discharge port provided in the segment ringForcible discharge means that can be forcibly discharged.The pressure of the filler sensed by the pressure sensor isWhen it exceeds a preset upper limit pressure, it is forcibly discharged so that it becomes a predetermined pressure.Filling material pressure control device,
[0011]
  as well as,
  Filler is injected into the gap between the outer peripheral surface of the shield device and the ground excavation surface that occurs in the extra excavation, and the bag-like material of the bag with the segment ring is inflated by the backing material at a position away from the shield device. In the equipment used in the construction method,
The suction pump for discharging the filler from a discharge port provided in a segment ring other than the segment ring with the bag, and the pressure of the filler near the outer peripheral surface of the segment ring is increased by inflating the bag-like material. A pressure sensor for detecting the pressure of the filler, and when the value of the pressure sensor exceeds a predetermined value, the pressure control device for the filler that operates the suction pump to lower the pressure of the filler to a predetermined pressure,
[0012]
  as well as,
  The pressure sensor and the forced discharge means;PreparedA shield device comprising either a filler pressure control device or a filler pressure control device comprising the suction pump and the pressure sensor;
[0013]
  as well as,
  It is a device that excavates with a digging cutter provided on the front surface, and it is connected to the filler inlet provided on the outer peripheral surface of the device and the filler is injected into the gap between the outer peripheral surface of the device and the natural excavation surface. Possible injection means and behind the deviceA forced discharge means connected to a forced discharge port provided in the constructed segment ring and capable of forcibly sucking and discharging the injected filler;A shield device characterized by
[0014]
  as well as,
  It is a device that excavates with a digging cutter provided on the front surface, and it is connected to the filler inlet provided on the outer peripheral surface of the device and the filler is injected into the gap between the outer peripheral surface of the device and the natural excavation surface. Possible injection means;Pressure sensor for sensing the pressure of the injected filler near the outer peripheral surface of the segment ring constructed at the rear of the deviceWhen,The filler connected to a forced discharge port provided in the segment ringForcible discharge means capable of forcibly discharging
  The injection means can be filled with the filler at a predetermined pressure, and the forced discharge meanspressure sensorPerceiveSaid fillerWhen the pressure exceeds the preset upper limit pressure, the shield device is forcibly discharged so as to be a predetermined pressure,
[0017]
I will provide a. The operation of the present invention is as follows.
The shield device is advanced by a front excavation cutter. And an injection | pouring means inject | pours a filler into the clearance gap between a shield apparatus and a natural ground excavation surface from the filler injection port provided in the outer peripheral surface of a shield apparatus.
[0018]
When removing the filler injected into the gap between the shield device and the ground excavation surface, the forced discharge means forcibly sucks and discharges the filler injected from the forced discharge port provided on the outer peripheral surface of the shield device. Thereby, it becomes possible to forcibly remove the filler injected into the gap between the shield device and the ground excavation surface.
[0019]
Further, in the shield device in which the filler inlet 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 excavation surface from the front of the device. When the filler injected into the gap between the shield device and the gap between the shield device and the ground excavation surface is discharged, it is forcibly discharged from the rear of the device. As a result, when filling the filler, the filler is filled in the gap between the shield device and the ground excavation surface soon after excavation from the front of the shield device. Pressure reinforcement can be performed smoothly. Further, when the filler is forcibly discharged, the forcible outlet is located behind the apparatus, so that the pressure in the gap between the shield apparatus and the ground excavation surface can be stabilized between before and after the shield apparatus.
[0020]
Further, in a shield device provided with a suction pressure sensor that senses the pressure on the outer peripheral surface, the suction pressure sensor sets an upper limit pressure that is preset by the pressure of the filler injected into the gap between the device outer peripheral surface and the natural excavation surface. When the pressure exceeds the limit, the forced discharge means forcibly discharges the filler from the forced discharge port to obtain a predetermined pressure. As a result, the pressure of the injected filler can be adjusted to a predetermined pressure.
[0021]
Furthermore, in combination with the forced suction when the pressure exceeds a predetermined pressure by the suction sensor, the injection means fills the filler from the filler inlet into the gap between the shield device and the ground excavation surface with a predetermined pressure. Thereby, it becomes possible to inject at a better pressure even at the time of filling the filler.
Then, the filler injection port is provided in front of the shield device, and the forced discharge port and the suction sensor are provided in the rear of the shield device, so that the pressure of the filler injected into the gap between the shield device and the ground excavation surface is spread over the entire shield device. Can be in a better state.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
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. FIG. 5 is a cross-sectional explanatory view illustrating an internal mechanism according to an embodiment of the present invention, FIG. 6 is an explanatory view illustrating an excavation state, and FIG. 7 is a central vertical cross-section of FIG. It is explanatory drawing.
[0023]
Reference numeral 1 denotes a shield device according to an embodiment of the present invention. As shown in FIG. 1, the shield apparatus 1 excavates a desired horizontal pit C by a shield excavator 2 that excavates the ground by a excavating cutter provided on the front surface to form a mine shaft, and sequentially segments the excavation end points. It is an apparatus for installing the ring S and excavating the shield mine A. The shield device 1 includes a shield machine 2 and a segment ring S. The shield machine 2 is rotated so as to close the opening of the outer body 3 at the tip of the outer body 3 and the outer body 3 that receives the external force from the side shaft C as an outermost wall when excavating the side shaft C. The excavation cutter 4 includes a hydraulic motor that is a cutter driving means, a screw conveyor unit that is an excavation soil carrying means for discharging excavation soil excavated by the excavation cutter 4, and an excavated horizontal pit C. An erector that builds the shield mine S by fixing the segment ring S to the inner wall, and a shield jack that is a digging means that obtains a reaction force for advancing the shield machine 2 from the segment ring S is fixed. It is not a description of the excavation of the shield machine 2 according to the embodiment, but a description of the filling of the filler that is injected into the outer periphery of the shield device 1 under pressure. It omitted also shown with no detail about device. In this embodiment, the shield machine 2 can be bent at the middle part of the outer trunk 3, and the shield machine 2 can be bent, so that the excavation diameter of the curved portion of the shield tunnel A can be made smaller. Of course, the shield machine 2 may comprise an outer cylinder 3 that cannot be bent.
[0024]
3a is a filler backflow prevention device. The filler backflow prevention device 3a is installed on the outer circumferential surface of the outer trunk 3 on the digging side, and is projected from the outer trunk 3 to the rear side of the digging in a ring shape so as to contact the natural ground excavation surface C. The filler backflow prevention device 3a detects that the filler filled in the shield extra excavation portion C2 that is the gap between the outer trunk 3 and the ground excavation surface C behind the filler backflow prevention device 3a goes to the excavation cutter 4 side. It is a device that prevents the filler material from contacting the ground excavation surface C so that the filler material does not turn to the excavation cutter 4 side at least at a predetermined pressure of the filler material filled in the shield surplus portion C2.
[0025]
In this embodiment, the segment ring S is combined and fixed in the horizontal shaft C in which the ring pieces of the segment ring S having a circular arc shape obtained by dividing the shield shaft A into 6 parts are excavated, and the direction of the excavation in the horizontal shaft C is determined. The shield mine A is configured by continuously fixing to the bottom. In this embodiment, the segment ring S is formed by combining each of the six divided ring pieces. However, depending on the diameter of the shield mine A to be constructed, the number of ring pieces can be divided into three or nine parts. The number may be selected to form the segment ring S.
[0026]
Below, the detail which constructs | assembles the segment ring S in the shield mine A is demonstrated.
As shown in FIG. 2, the segment ring S is sequentially installed behind the shield machine 2 by the shield device 1 and formed in a cylindrical shape. A plurality of segment rings S are connected in series.
The segment constituting the segment ring S includes an ordinary segment S1 in which the outer periphery of the metal surface is exposed, a segment S3 with a bag in which a bag-like object S2 is attached to the outer peripheral surface of the metal surface, and is inflated as necessary. A bag-like object S2 smaller than the attached segment S3 is formed from the attached bag segment S4 attached to the outer peripheral surface and inflated as necessary, and the attached bag segments S3 and S4 can be selectively used by the shield mine C to be excavated. The segment S3 with bag and S4 make the bag-like thing S2 install between the segment ring S and the natural ground excavation surface C1.
[0027]
For example, when the segment ring S is formed by the ordinary segment S1 and the partially opened bagged segment S4, as shown in FIG. 2 and FIG. Is formed with an open part S5. Although not shown, when the segment ring S is formed of the bag-attached segment S3 over the entire circumference in the outer peripheral direction, the opening S5 is not formed.
[0028]
Thus, the shield mine A is formed from the shield device 1 in a state where the space between the excavated natural ground excavation surface C1 and the segment ring S is formed by the bag-like segment S3 and the bag-like object S2 of the bag-attached segment S4. A filler is pressurized and injected into the gap between the mountain excavation surface C1 and the segment ring S to impregnate the natural excavation surface C, and the segment ring S and the natural excavation surface C are fixed.
[0029]
Therefore, the filler pressurization and injection mechanism of the shield device 1 will be described below.
5 is a filler inlet. A plurality of filler inlets 5 are provided on the outer peripheral surface of the shield device 1 at regular intervals.
[0030]
Reference numeral 6 denotes a filler inlet, but a plurality of the filler rings are provided on the outer peripheral surface of the segment ring S at regular intervals. Alternatively, the filler injection port 6 may be installed only at necessary portions of the segment ring S, and a filler may be connected by extending a pipe from a filler injection pipe 9 provided in the shield device 1. A curing agent is injected from the filler inlet 6 instead of the filler or the filler.
[0031]
7 is a filler injection pipe, 8 is a solenoid valve, 9 is a filler injection pipe, and 10 is a distribution pipe. The filler injection pipe 7 is connected to an injection pump (not shown) on the upstream side to convey the filler. The filler injection pipe 9 is connected to the filler supply pipe 7 on the upstream side via the electromagnetic valve 8. The downstream of the distribution pipe 10 is divided by the distribution pipe 10. The opening of the distribution pipe 10 is formed by the filler inlet 5 or the filler inlet 6. Furthermore, a check valve 11 is provided at the filler inlet 5 and the filler inlet 6. Therefore, the filler filling hole 5 and the filler filling hole 6 provided with the check valve 11 are opened in the shield extra excavation part C2 which is a gap between the outer peripheral surface of the shield device 1 and the ground excavation surface C1. State.
[0032]
Reference numeral 12 denotes a pressure detection hole. The pressure detection hole 12 is a distribution pipe in which the check valve 11 is not installed.
[0033]
Reference numerals 13 and 14 denote pressure sensors. The pressure sensor 13 is connected to the filler injection tube 9 and can detect the pressure in the filler injection tube 9. Therefore, the pressure sensor 13 can detect the applied pressure of the filler that is pressurized and injected from the filler inlet 5 via the injection tube 9. The pressure sensor 14 can directly detect the pressure of the shield extra excavation portion C <b> 2, which is a gap between the outer peripheral surface of the shield device and the natural ground excavation surface 21, without going through the filler injection pipe 9.
[0034]
In this embodiment, a plurality of pressure sensors 13 and 14 are provided. However, as shown in FIG. 5, when the filling material is injected by one injection pump (not shown), the pressure sensor 13 is provided. Only one may be provided, and the pressure sensor 14 may not be provided, and the injection pressure may be measured when the filler is injected, and the pressure outside the shield machine may be measured when the injection is not performed. 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 digging 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.
[0035]
If the pressure sensor 13 and the pressure detection hole 12 are only combined with the injection device, for example, when the permeability of the natural ground is large, it is caused by the penetration of the filler into the natural ground at a place where the detection hole is separated. The pressure drop may not be managed. Therefore, by installing at a free position, pressure management is possible over the entire length of the shield device by installing a plurality of injection holes in accordance with the nature of the natural ground.
[0036]
The pressure sensor 14 and the pressure detection hole 12 are freely installed regardless of the position of the filler injection tube 9. That is, the filling material injection pipe 9 can measure the injection pressure when the filling material is injected, and can measure the pressure of the extra moat C2 when the injection is stopped. Is installed. In addition, as shown in FIG. 5, a pressure sensor 14 for measuring only the pressure in the overfill 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.
[0037]
By installing a plurality of pressure sensors 13 and 14 at free positions, it becomes possible to detect pressure according to the nature of the natural ground.
Reference numeral 15 denotes a control device. The control device 15 includes control means such as a computer device, and is connected to the pressure sensor 13, the pressure sensor 14, the electromagnetic valve 8, and an infusion pump (not shown). The control device 15 can control the operation of the infusion pump (not shown) and the electromagnetic valve 8 by comparing the predetermined pressure stored in advance with the pressure information received from the pressure sensors 13 and 14.
[0038]
In this embodiment, the filler supplied from the injection pump (not shown) to the filler inlets 5 and 6 includes a filler and a curing agent, and the filler injection hole from the injection pump (not shown). As the filler supplied to 5, a cement-based or slag / lime-based material is used as a hardening developing material, and lime, gypsum, inorganic salts and the like are promoted as a gelation accelerator.
[0039]
In addition, as materials for imparting slow hardness, acids having, as main components, lignin sulfonic acid type, hydroxycarboxylic acid type, oxycarboxylic acid type and the like are used.
[0040]
In this embodiment, water glass, an aluminum salt solution, or the like is used as the curing agent supplied from the injection pump to the filler inlet 6.
As the quick-set backfilling material, a cement-based or slag / lime-based material is used as a hardening-generating material, and a material using a clay mineral such as bentonite is used in order to improve fluidity. Moreover, in order to give instantaneous setting property, what mixed water glass type silicic acid, for example is used.
The curing time is selected by selecting the mixing ratio of these fillers and curing agents.
[0041]
The primary injection for pressurizing and injecting filler into the shield extra excavation portion C2 which is the gap between the outer peripheral surface of the shield device 1 and the natural ground excavation surface C1, and the filler in the shield extra excavation portion C2 that is further injected primary. In the case of performing the secondary injection in which the curing agent for curing is pressurized and injected at a pressure larger than the pressure held by the filler of the primary injection, the pressure that the filler of the primary injection holds in the shield overfill portion C2. By injecting the secondary-curing hardener with a large pressure, the hardener can easily penetrate into the natural ground.
It is possible to harden the filler without removing the filler that is primarily injected into the overburden.
[0042]
A filler having a slow-hardening property that hardens with time from the shield machine 2 is first injected into the shield extra excavation portion C2, which is a gap between the outer peripheral surface of the shield device 1 and the natural excavation surface C1, and then the shield. When the shield construction method is used in which the instantaneous backing material is secondarily injected from the segment ring S installed at the rear of the excavator 2 into the shield excavation C2, depending on the conditions of the natural ground, the slow-acting filler may be It penetrates into a mountain and pressurizes in advance so as not to form a void when the filler is cured.
[0043]
The filler that fills the shield extra excavation portion C2 that is the gap between the outer peripheral surface of the shield device 1 and the natural excavation surface C1 has a slow-curing property that cures over time, and the time until further curing is made of the material Can be set by selecting the material, it is possible to appropriately set the time until the filler injected into the shield surplus portion C2 is cured by selecting the material.
[0044]
A primary injection in which a filler is pressurized and injected into the shield extra excavation portion C2, which is a gap between the outer peripheral surface of the shield device 1 and the natural ground excavation surface 21, is performed, and the primary injection of the shield extra excavation portion C2 is further filled. When the secondary injection for pressurizing the curing agent for curing the agent is performed while maintaining a predetermined pressure, it is possible to cure the filler without removing the primary injected filler in the shield overfill portion C2. At the same time, it becomes possible to inject the filler into the shield extra excavation C2 at a predetermined pressure.
[0045]
When the pressure information received from the pressure sensor 13 is compared with a predetermined pressure and the operation of the electromagnetic valve 8 is controlled by the control device 15, if the pressure detected by the pressure sensor 13 is higher than the predetermined pressure, the electromagnetic valve 8 is The injection of the filler into the closed shield surplus portion C2 is stopped. When the pressure is lower than the predetermined pressure, the electromagnetic valve 8 is opened and the filler is injected into the shield excavation C2. Therefore, by controlling the solenoid valve 8 with the control device 15, it becomes possible to efficiently inject the filler into the shield surplus portion C2, and to keep the pressure outside the shield machine 2 within a certain range. .
[0046]
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. As shown in FIGS. 6 and 7, the forced discharge port 16 is opened to a segment ring S formed at the rear portion of the shield machine 2.
[0047]
A plurality of forced discharge ports 16 may be installed, or a single forced discharge port 16 may be provided. In this embodiment, five locations are provided in the same segment ring S, but the number of forced discharge ports 16 may be different depending on the shield mine A to be excavated, and there is no particular limitation.
[0048]
The filler suction pipe 17 is installed inside the segment ring S by connecting the forced discharge port 16 and the suction pump 18.
[0049]
The suction pump 18 is installed in the segment ring S and connected to the control device 15. The suction pump 18 operates according to an instruction signal from the control device 15. The filler suction pipe 17 is installed in the segment ring S, and the filler suction pipe 17 is filled with the filler filled in the shield excavation C2 which is the gap between the natural ground excavation surface C and the shield device 1 from the forced discharge port 16. Can be aspirated via.
[0050]
The suction pressure sensor 19 is installed at an intermediate portion of the filler suction pipe 17 and is connected to be capable of measuring pressure according to an instruction from the control device 15 and outputting sensed pressure information to the control device 15. Then, the suction pressure sensor 19 can detect the pressure of the shield extra excavation portion C2, which is the pressure outside the forced discharge port 16. Accordingly, the suction pressure sensor 19 is installed on the relatively forced discharge port 16 side of the filler suction pipe 17. If a plurality of forced discharge ports 16 are installed, a plurality of suction pressure sensors 19 may be installed in accordance therewith. By installing a plurality of suction pressure sensors 19, the control device 15 can more accurately control the pressure in the shield extra-cavity C <b> 2. While being able to measure, the pressure difference by the part of the shield extra moat part C2 can be detected.
[0051]
Next, the operation of this embodiment will be described. In the description, it is assumed that the filling and curing of the filler are completed in the shield extra moat C2a shown in FIG.
[0052]
During the excavation of the shield machine 2, the filler is injected from the filler inlet 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 excavation part C2 which is the periphery of the shield machine 2 detected by the pressure sensors 13 and 14, and the electromagnetic valve 8 is opened and closed at the time of injection. A filler will be injected into the shield extra moat C2.
[0053]
The filler injection pressure is filled so that the measured pressure of the filler measured by the pressure sensors 13 and 14 in the shield surplus portion C2 is within a predetermined pressure range. For example, when the face pressure is P0 and the predetermined pressure is P1,
[0054]
P0−0.1 (Mpa) ≦ P1 ≦ P0 + 0.1 (Mpa)
[0055]
The pressure is controlled to be within this pressure range.
As the filler injected at this time, a slow-curing slow-hardening filler having a relatively slow curing speed in accordance with the digging speed of the shield machine 2 is employed.
[0056]
When this slow-hardening filler is injected, the filler segment S3a including the portion of the shield extra moat C2a that has already been injected and hardened is hardened. Is filled at a predetermined pressure and is not cured.
[0057]
In this state, a backing material that has a quick setting property is injected into the segment S3b with bag, and reaches the ground excavation surface C like the segment S3a with bag to be cured.
Then, the filler in the shield additional moat C2b between the bag-attached segment S3a to the bag-attached segment S3b is prevented from entering the shield extra moat C2c which is on the near side by the bag-attached segment S3b.
[0058]
Then, when the instantaneous backing material is injected into the bag-like material S2 of the bag-attached segment S3b, the pressure of the filler filled in the shield extra moat portion C2b and the shield extra moat portion C2c causes the bag-like material S2 to expand Therefore, when the pressure of the shield extra-cavity C2 exceeds the pressure range of the predetermined pressure, such as when the pressure range of the predetermined pressure expressed by the mathematical formula is exceeded, the suction pressure sensor 19 detects the pressure. Therefore, a pressure signal exceeding the pressure range is output to the control device 15.
[0059]
Then, the control device 15 instructs the suction pump 18 to perform suction because the pressure becomes equal to or higher than the predetermined pressure.
The suction pump 18 starts suction. Then, the filler in the shield extra excavation C2 is sucked from the forced discharge port 16.
[0060]
Since the suction pump 18 performs suction, the pressure of the shield extra excavation C2 decreases and eventually reaches a predetermined pressure.
Then, since the control device 15 inputs the pressure signal that 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.
[0061]
With this series of operations, the pressure of the shield extra excavation C2 can be maintained within a predetermined pressure range.
[0062]
Note that the pressure at which the control device 15 finishes the suction by the suction pump 18 is not the upper limit of the pressure range of the predetermined pressure, but is set to P1 in the above-described formula, so that the pressure immediately after the suction by the suction pump 18 is finished. It is possible to avoid the phenomenon that exceeds the upper limit of the pressure range of the predetermined pressure.
[0063]
As described above, when the shield machine 2 constructs the segment ring S while excavating, it is possible to set the pressure of the shield extra excavation 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 is increased, but better pressure control is possible.
[0064]
In addition, since it is performed by the prior art when the filling material pressure of the shield extra excavation part C2 is equal to or lower than the lower limit of the pressure range of the predetermined pressure, the measurement of the pressure sensor 13 and the pressure sensor 14 is not described in detail. When the pressure falls below the lower limit of the pressure range of the predetermined pressure, the control device 15 controls the opening degree of the electromagnetic valve 8 and fills the shield surplus portion C2 until the filler pressure reaches the predetermined pressure. Fill with more agent.
[0065]
Next, when excavation cutter 4 is replaced or when the driving unit of shield machine 2 is broken, shield machine 2 must be stopped for a long period of time in shield tunnel A during excavation. However, if the filler filled in the shield overfill portion C2 is hardened although it is a slow-hardening filler, the shield machine 2 cannot dig again. A case where this problem is avoided will be described below.
[0066]
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 extra excavation C2 from the forced discharge port 16. The non-curable filler is filled from the filler inlet 5 and the filler inlet 6 by an injection pump (not shown). At this time, the control device 15 keeps the pressure in the shield extra excavation C2 within a predetermined pressure range based on the values of the pressure signals input from the pressure sensor 13, the pressure sensor 14, and the suction pressure sensor 19. In this way, filling and suction are performed simultaneously.
[0067]
By continuing this work, the slow-hardening filler that has been filled in the shield overfill portion C2 is eventually replaced with a non-hardening filler, and the filler filled in the shield overfill portion C2 is not cured. It can be driven again and resumes digging.
[0068]
【The invention's effect】
Therefore, according to this invention, it is possible to keep the pressure of the filler filled in the shield surplus portion at a predetermined pressure, so that the filler on the excavation cutter side beyond the ground uplift and the filler backflow prevention device can be maintained. It is possible to eliminate problems caused by the pressure of the filler being too high, such as wraparound.
[0069]
In addition, it is possible to fill with a new filler while sucking the filler filled in the shield overfill part, and the pressure at the time of suction and filling can be controlled, so the shield overfill part is filled once while keeping the pressure at a predetermined pressure. The filler can be replaced with a new filler, and even when the shield apparatus stops being digged in the shield mine A, it is possible to prevent the filler from being hardened around the shield apparatus.
[Brief description of the 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 diagram of the central longitudinal section of FIG.
FIG. 4 is an explanatory diagram illustrating another embodiment of FIG.
FIG. 5 is a cross-sectional explanatory view illustrating the internal mechanism of the embodiment of the present invention.
FIG. 6 is an explanatory diagram showing the state of excavation
7 is an explanatory diagram of the central longitudinal section of FIG. 6;
FIG. 8 Conventional example diagram
[Explanation of symbols]
    A Shield mine
    C horizontal shaft
    C1 ground excavation surface
    C2 Shield Yobori
    S Segment ring
    S1 Normal segment
    S2 Bag
    S3 segment with bag
    S4 segment with bag
    S5 opening part
    1 Shield device
    2 shield machine
    3 outer trunk
    3a Filler backflow prevention device
    4 Drilling cutter
    5 Filler inlet
    6 Filler inlet
    7 Filler injection pipe
    8 Solenoid valve
    9 Filler injection pipe
    10 minutes piping
    11 Check valve
    12 Pressure detection hole
    13 Pressure sensor
    14 Pressure sensor
    15 Control device
    16 Forced outlet
    17 Filler suction pipe
    18 Suction pump
    19 Pressure sensor

Claims (6)

In the device used for the shield method that injects the filler into the gap between the outer peripheral surface of the shield device and the ground excavation surface that occurs in the surplus,
The segment ring is provided with a discharge port capable of forcibly discharging the filler injected into the gap between the segment ring behind the shield device and the ground excavation surface, and the filler is forcibly sucked from the discharge port. And a forcible discharge means that can be discharged. In the device used for the shield method that injects the filler into the gap between the outer peripheral surface of the shield device and the ground excavation surface that occurs in the surplus,
A pressure sensor for sensing the pressure of the injected filler near the segment ring outer peripheral surface behind the shield device, and a forced discharge means connected to a forced discharge port provided in the segment ring and forcibly discharging the filler. And a forcible discharge means forcibly discharges the filler so as to become a predetermined pressure when the pressure of the filler detected by the pressure sensor exceeds a preset upper limit pressure. Filler is injected into the gap between the outer peripheral surface of the shield device and the ground excavation surface that occurs in the extra excavation, and the bag-like material of the bag with the segment ring is inflated by the backing material at a position away from the shield device. In the equipment used in the construction method,
The suction pump for discharging the filler from a discharge port provided in a segment ring other than the segment ring with the bag, and the pressure of the filler near the outer peripheral surface of the segment ring is increased by inflating the bag-like material. A pressure sensor for detecting the pressure of the filler, and when the value of the pressure sensor exceeds a predetermined value, the suction pump is operated to lower the pressure of the filler to a predetermined pressure. A shield device comprising the pressure control device according to claim 2 .   It is a device that excavates with the excavation cutter provided on the front, and the filler is injected into the gap between the filler inlet provided on the outer peripheral surface of the device and the filler outer peripheral surface and the ground excavation surface. And a forcible discharge means connected to a forced discharge port provided in a segment ring constructed at the rear of the apparatus and capable of forcibly sucking and discharging the injected filler. Characteristic shield device. It is a device that excavates with a digging cutter provided on the front surface, and it is connected to the filler inlet provided on the outer peripheral surface of the device and the filler is injected into the gap between the outer peripheral surface of the device and the natural excavation surface. Possible injection means, a pressure sensor for sensing the pressure of the injected filler in the vicinity of the outer peripheral surface of the segment ring constructed at the rear of the apparatus, and forcing the filler connected to a forced outlet provided in the segment ring And forced discharge means that can discharge
The injection means can fill the filling material with a predetermined pressure, and the forced discharge means forcibly discharges the filling material so that it becomes a predetermined pressure when the pressure of the filling material detected by the pressure sensor exceeds a preset upper limit pressure. A shield device characterized by:

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