JP2015101910A - Shield tunneling machine, and shield tunneling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To favorably control a direction (posture) of a shield tunneling machine.SOLUTION: Chemical injection parts 13b are arranged at a top and bottom and left and right of an external periphery of a rear barrel plate 3b constituting a shield tunneling machine 1, and when bending a front barrel plate 3a of the shield tunneling machine 1 in order to correct a shield tunneling direction (posture) of the shield tunneling machine 1 on the soft cohesive ground, solution-type chemical injection materials are injected into the ground from the chemical injection parts 13b arranged at a side face opposite to the bending direction. By the injection pressure of the solution-type chemical injection materials, the front barrel plate 3a becomes easy to direct an initial bending direction, thereby the shield tunneling direction (posture) of the shield tunneling machine 1 can be favorably corrected.

Description

  The present invention relates to a shield machine and a shield machine method, for example, a technique related to direction (attitude) correction control of a shield machine.

  A shield machine is a device that constructs a tunnel by assembling a segment on the inner periphery of the excavated mine while excavating a natural ground by rotating a cutter board pressed against the face while stabilizing the face. is there.

  The main body of the shield machine has a front body and a rear body. The front body portion is connected to the front end portion of the rear body portion in a refractable state. In the device body, a plurality of folded jacks and shield jacks are arranged between the front body portion and the rear body portion along the circumferential direction of the device body. Generally, the digging direction (posture) of the shield machine is controlled by selecting the bent jack or the shield jack.

  The shield machine is described in, for example, Patent Document 1, and in the shield machine provided with a plurality of middle-folded jacks that flexibly connect the front body portion and the rear body portion, both right and left middle-folding jacks are provided. The structure which refracts the front trunk | drum with respect to a rear trunk | drum centering | focusing on the attachment part of the other middle foldd jack is disclosed by extending one middle bent jack.

JP 2001-20659 A

  By the way, if the fold jack is used to correct the digging direction (posture) of the shield machine in the soft ground, the ground is soft and the front torso does not face the desired direction, and the back torso is also located. As a result of turning in the direction opposite to the initial direction, the shield machine may be easy to meander. In addition, when the shield jack is selected, there is a case where the segment moves (kicks) because the ground is soft.

  Therefore, when correcting the digging direction (posture) of the shield machine in the soft viscous ground, it is easy to bend the front torso by pre-excavating the ground on the refraction direction side of the shield machine, This is dealt with by making the amount of operation of the folding jack more than usual in anticipation of the amount of movement of the torso. However, even in this case, for example, in the case of horizontal correction at the gradient change point, the ability of the folding jack is insufficient, and the digging direction (posture) of the shield machine cannot be corrected sufficiently. is there.

  The present invention has been made from the technical background described above, and an object of the present invention is to provide a technique capable of satisfactorily controlling the digging direction (posture) of the shield machine.

  In order to solve the above-described problem, the shield machine according to the first aspect of the present invention provides a ground on the side surface opposite to the direction of refraction when the front body portion constituting the device body is refracted when controlling the direction of digging. And an injecting means for injecting the injecting material.

  According to a second aspect of the present invention, in the first aspect of the present invention, the injection means is arranged in a state of being distributed along the outer periphery of the device main body on a side surface of the device main body, A plurality of injection parts for injecting the injection material from the side surface of the main body to the ground, and the injection material from the injection parts located on the opposite side to the refractive direction of the front body part among the plurality of injection parts. And a control unit that controls to inject.

  According to a third aspect of the present invention, in the invention of the second aspect, the injection portion is provided at least vertically and horizontally on an outer periphery of a rear body portion that supports the front body portion in a bendable state. It is characterized by.

  According to a fourth aspect of the present invention, in the invention according to the first, second, or third aspect, the injection material is a solution-type chemical liquid injection material.

  Further, in the shield excavation method of the present invention according to claim 5, when the front trunk portion constituting the device main body of the shield excavator is refracted when controlling the excavation direction of the shield excavator, It has the process of inject | pouring an injection material into the ground of an opposite side surface, It is characterized by the above-mentioned.

  According to a sixth aspect of the present invention, there is provided the invention according to the fifth aspect, wherein the device main body is disposed on the side surface of the device main body so as to be distributed along the outer periphery of the device main body. A plurality of injecting portions for injecting the injecting material, and the injection material is controlled to be injected from an injecting portion located on the opposite side to the refractive direction of the front body portion among the plurality of injecting portions And a control unit.

  According to a seventh aspect of the present invention, in the invention according to the sixth aspect, the injection portion is provided at least vertically and horizontally on an outer periphery of a rear body portion that supports the front body portion in a bendable state. It is characterized by.

  The invention according to claim 8 is the invention according to claim 5, 6 or 7, characterized in that the injection material is a solution type chemical injection material.

  According to the first aspect of the present invention, a sufficient reaction force can be taken when the front body portion is refracted, so that the digging direction (posture) of the shield machine can be controlled well.

  According to the second aspect of the present invention, a sufficient reaction force can be taken when the front body portion is refracted, so that the digging direction (posture) of the shield machine can be controlled well.

  According to invention of Claim 3, it becomes possible to control the digging direction (attitude) of a shield machine with a simple structure favorably.

  According to the fourth aspect of the present invention, since the injection material does not adhere to the shield machine, the work for controlling the direction (posture) of the shield machine can be performed satisfactorily.

  According to the fifth aspect of the present invention, a sufficient reaction force can be taken when the front body portion is refracted, so that the digging direction (posture) of the shield machine can be well controlled.

  According to the sixth aspect of the present invention, since a sufficient reaction force can be taken when the front body portion is refracted, it is possible to favorably control the digging direction (posture) of the shield machine.

  According to the seventh aspect of the invention, it is possible to satisfactorily control the digging direction (posture) of the shield machine with a simple structure.

  According to the eighth aspect of the present invention, since the injection material does not adhere to the shield machine, it is possible to perform the work of controlling the digging direction (posture) of the shield machine well.

It is the principal part block diagram which looked through the inside of the shield machine which concerns on one embodiment of this invention from the side. It is a front view of the cutter head of the shield machine of FIG. The left half is a partial front view as seen from the arrow direction of the A1-A1 line of the shield machine in FIG. 1, and the right half is a partial front view as seen from the arrow direction of the line A2-A2 in the shield machine of FIG. It is the front view which showed the installation position of the chemical | medical solution injection | pouring part of the shield machine of FIG. (A), (b) is a top view in the correction process of the digging direction (posture) of a general shield machine. (A)-(c) is a top view in the correction process of the digging direction (attitude | position) of the general shield machine in a soft viscous ground. (A)-(c) is a top view in the correction process of the digging direction (attitude | position) of another general shield machine in a soft viscous ground. (A)-(c) is a top view in the correction process of the digging direction (posture) of the shield machine of FIG. 1 in a soft viscous ground.

  Hereinafter, an embodiment as an example of the present invention will be described in detail with reference to the drawings. Note that components having the same function are denoted by the same reference symbols throughout the drawings for describing the embodiment, and the repetitive description thereof will be omitted.

  First, the structural example of the shield machine of this Embodiment is demonstrated with reference to FIGS. FIG. 1 is a main part configuration diagram showing the inside of the shield machine of the present embodiment as seen through the side, FIG. 2 is a front view of the cutter head of the shield machine of FIG. 1, and the left half of FIG. 3 is a partial front view of the shield machine from the arrow direction of the A1-A1 line, FIG. 3 is a partial front view of the shield machine from the arrow direction of the A2-A2 line of FIG. 1, and FIG. It is the front view which showed the installation position of the chemical | medical solution injection | pouring part of this shield machine.

  The shield machine 1 according to the present embodiment, for example, generates mud pressure by digging in a state in which the chamber 4 between the cutter head (cutter board) 2 and the device body 3 is filled with mud, and the mud It is a mud pressure shield excavator that excavates with the pressure opposed to the earth pressure of the face. In addition, the mud in the chamber 4 is generated by injecting an additive into the earth and sand excavated by the cutter head 2 and kneading, and has impermeableness and plastic fluidity (property that can be freely deformed and moved). have.

  The operation of the shield machine 1 is controlled by an operator in a cab in a succeeding carriage (not shown) disposed behind the shield machine 1. Moreover, the whole operation | movement of the shield machine 1 is controlled by the control part provided in the cab.

  Further, the tunnel constructed by the shield machine 1 is not particularly limited. For example, the tunnel is a relatively small diameter tunnel such as a water tunnel, a sewage tunnel, or a cable tunnel. The segment outer diameter Rt is, for example, about 2150 mm.

  The cutter head 2 constituting the shield machine 1 is a member for excavating the face of a natural mountain, and is installed on the front surface of the equipment body 3 so as to be rotatable in the forward and reverse directions along the circumferential direction of the equipment body 3. Yes.

  The type of the cutter head 2 is, for example, a disk-like spoke type. That is, as shown in FIG. 2, the cutter head 2 has an outer periphery that connects a central hub portion 2a, four spoke portions 2b that extend radially from the hub portion 2a toward the outer periphery, and a tip portion of the spoke portion 2b. A ring portion 2c and a through hole 2d formed between these members are provided.

  A center bit 5a is installed on the front surface (surface facing the face) of the hub portion 2a. A plurality of bits 5b and a scraper tooth 5c are installed on the front surface of each spoke 2b.

  The hub portion 2a and the spoke portion 2b are provided with an additive injection portion (not shown). This additive injection part is a part for injecting an additive (mud clay material) such as bentonite toward the face. As the additive, for example, a bubble material may be used instead of bentonite, or both a bentonite and a bubble material may be used.

  In addition, a bit 5d and a copy cutter 5e are installed in the outer ring portion 2c. The bit 5d has a role of cutting obstacles. Further, the copy cutter 5e has a role of performing excavation at the time of sharp curve construction, attitude control of the shield machine 1 and the like.

  Furthermore, as shown in FIG. 1, a mixing blade 6 is installed on the back surface of the cutter head 2. The kneading blade 6 is formed, for example, in a cylindrical shape, and has a role of stirring and mixing the earth and sand in the chamber 4 and the additive when the cutter head 2 rotates.

  On the other hand, as shown in FIG. 1, the apparatus main body 3 constituting the shield machine 1 includes a front body plate (front body part) 3a, a rear body plate (rear body part) 3b behind it, and a tail behind the body. And a seal 3c.

  The front trunk plate 3 a and the rear trunk plate 3 b are formed of, for example, a cylindrical steel plate, and are portions that form the outer shape of the device main body 3 and form a hollow space inside the device main body 3. The front body plate 3a and the rear body plate 3b are engaged with each other when the spherical bearing portion at the tip of the rear body plate 3b is in contact with the inner peripheral surface of the front body plate 3a on the rear end side of the front body plate 3a. Has been.

  The tail seal 3c is a sealing member that prevents groundwater and the like from entering the apparatus main body 3 from the rear part of the apparatus main body 3 during excavation work, and the inner periphery of the rear cylinder plate 3b at the rear end of the rear cylinder plate 3b. It is installed in a frame shape along.

  On the front side of the front body plate 3a, a partition wall 7 that divides the hollow space in the device main body 3 into the face side and the machine interior is installed at a position retracted inward of the device main body 3 from the front surface. The chamber 4 is provided on the face side of the partition wall 7, that is, between the cutter head 2 and the partition wall 7. The chamber 4 takes in the earth and sand excavated by the cutter head 2 through the through hole 2 d of the cutter head 2.

  In the shield machine 1, the cutter drive body 8, the bent jack 9 a, the shield jack 9 b, the screw conveyor 10, the erector 11, the earth pressure detection unit 12, the additive material injection unit 13 a, and the chemical solution injection unit ( An injection part) 13b and the like are installed.

  The cutter driver 8 is a motor (drive source) that rotates the cutter head 2 in the forward and reverse directions. Here, the outer periphery support drive system is illustrated as a cutter drive system. That is, a plurality of cutter driving bodies 8 are arranged side by side along the circumferential direction of the cutter head 2 in the vicinity of the outer periphery in the front of the cutter head 2 (see the left half of FIGS. 1 and 3).

  The bent jack 9a is a device that connects the front body plate 3a and the rear body plate 3b and corrects the propulsion direction and posture of the shield machine 1. A plurality of middle-folded jacks 9a are arranged side by side along the circumferential direction of the device body 3 so as to straddle the boundary between the front body plate 3a and the rear body plate 3b in the device body 3 (FIGS. 1 and 3 Refer to the left half).

  By supplying pressure oil to the bent jack 9a and propelling the shield machine 1 in a state where the front body plate 3a and the rear body plate 3b are refracted in a predetermined direction and angle, the shield machine 1 The propulsion direction and attitude can be controlled.

  The shield jack 9b is a device that generates a propulsive force for advancing the shield machine 1 by applying a reaction force to the segment SG installed behind the device body 3. A plurality of shield jacks 9b are arranged side by side along the circumferential direction of the equipment body 3 so as to straddle the boundary between the front body plate 3a and the back body plate 3b in the equipment body 3 (FIGS. 1 and 3). See right half).

  The segment SG is a member that covers the inner periphery of the excavation mine, and a plurality of segments SG are installed along the circumferential direction of the excavation mine. The segment SG is composed of, for example, a steel box segment or a concrete segment. In addition, the width (dimension along the longitudinal direction of the excavation mine) of the segment SG is, for example, about 1000 mm, and the height (thickness) is, for example, about 75 mm.

  The screw conveyor 10 is a device for discharging the earth and sand taken into the chamber 4 to the outside of the machine. The screw conveyor 10 is disposed at a position slightly higher than the center in the height direction of the device main body 3 behind the device main body 3 from the earth and sand taking-in end portion 10 a that penetrates the partition wall 7 and is disposed in the chamber 4 at the bottom of the device main body 3. It is provided in a state of continuously extending obliquely upward toward the discharge end portion 10b.

  The erector 11 is an assembly device that holds the segment SG, turns in the inner circumferential direction of the excavation mine, and transfers it to an assembly position in the inner circumferential direction of the excavation mine. The erector 11 is installed in the rear trunk plate 3b so as to be rotatable along the circumferential direction of the excavation pit by a hydraulic motor 11m for driving the erector (see the right half side in FIG. 3).

  The earth pressure detection unit 12 (see FIG. 1) is a sensor that detects the mud pressure in the chamber 4. The shield machine 1 performs excavation work while maintaining the stability of the face by managing the mud pressure in the chamber 4 detected by the earth pressure detector 12.

  The additive injection part 13a is a part for injecting the additive (mud clay material) described above into the outer periphery and face of the shield machine 1. This additive injection part 13a is arrange | positioned in multiple places along the circumferential direction of the front trunk | drum plate 3a.

  The chemical solution injection part (injection means) 13b is a solution type described later on the ground opposite to the refraction direction of the front body plate 3a of the shield machine 1 when controlling the direction (posture) of the shield machine 1. This is the part for injecting the chemical injection material.

  As shown in FIG. 4, the chemical liquid injector 13 b is arranged in a state of being distributed at, for example, four locations on the inner circumference of the rear trunk plate 3 b. Each chemical solution injection part 13b is connected to a common chemical solution supply part (injection means) through a pipe (injection means) not shown. A switching valve (injection means) (not shown) is connected in the middle of each pipe. By controlling the opening / closing operation of the switching valve by the control unit (injecting means) in the cab of the succeeding carriage, it is selected which of the four liquid injection parts 13b is supplied with the solution type chemical injection material. The Further, the supply of the solution type chemical solution injection material from the chemical solution supply unit to each chemical solution injection unit 13b is performed by a hydraulic pump or the like (not shown). In addition, arrow B1 of FIG. 4 has shown the injection direction of the solution type chemical | medical solution injection material.

  The number of the chemical solution injection portions 13b is not limited to the above, and can be variously changed. However, if the number of the chemical solution injection portions 13b is excessively large, the number of pipes and switching valves increases, which may increase the size of the equipment and complicate the in-flight facilities. On the other hand, the chemical solution injection part 13b is arranged at four locations, so that the digging direction (posture) of the shield machine 1 can be controlled well, the structure can be simplified, and the size of the equipment and the complexity of the in-machine equipment can be avoided. can do.

  The above-described solution-type chemical solution injection material is, for example, a material that can arbitrarily adjust the solidification time, and mainly includes a water glass-based chemical solution. This solution type chemical solution injection material has a gel time as short as about 5 to 15 seconds, and the gel time can be easily adjusted by blending. In addition, when the suspension type chemical solution injection material is used, there is an adverse effect of adhering to the shield machine 1, whereas the solution type chemical solution injection material has almost no single strength, so the front body plate 3a and the back body plate There is no harmful effect such as adhesion to 3b. Furthermore, since the solution-type chemical solution injection material is solidified after elapse of a predetermined time, the strength of the ground can be ensured. Moreover, the solution-type chemical injection material has a small contact resistance with respect to the shield machine 1 even after solidification, and does not hinder the digging operation of the shield machine 1.

  In the plane of the partition wall 7, an additive material injection portion (not shown) is installed. The additive material injection portion of the partition wall 7 is a portion for injecting the additive material (mud clay material) into the chamber 4.

  Next, a general shield machine direction (posture) correction control studied by the inventors will be described with reference to FIGS. FIGS. 5A and 5B are plan views in a process of correcting the digging direction (posture) of a general shield machine.

  FIG. 5A illustrates a case where the shield machine 1 is slightly shifted to the left with respect to the drilling plan line CL (left meander). The front trunk plate 3a of the shield machine 1 faces forward as indicated by an arrow B2.

  In order to correct the left meandering state, as shown in FIG. 5 (b), the left bent jack of the shield machine 1 is extended in the direction of arrow B3. As a result, the front trunk plate 3a of the shield machine 1 turns to the right as indicated by the arrow B4, and the tip (cutter head) of the shield machine 1 moves to the right. It can be corrected.

  Next, FIGS. 6A to 6C are plan views of a general shield machine in a digging direction (posture) correction process in a soft viscous ground. In FIGS. 6B and 6C, the ground G1 and G2 are hatched.

  FIG. 6A illustrates the case where the shield machine 1 is meandering to the left as in FIG. 5A. Here, as shown in FIG. 6 (b), if the middle folding jack on the left side of the shield machine 1 is extended in the direction of the arrow B3 in the same manner as described above, the ground G1 on the side surface of the rear trunk plate 3b is soft. As a result of the trunk plate 3a not facing right and the rear trunk plate 3b facing left, the shield machine 1 is more likely to meander to the left.

  Therefore, as shown in FIG. 6 (c), when the correction is made by the shield jack of the shield machine 1, the ground G2 on the side surface of the segment SG which is the reaction force of the shield jack is soft and moves to the left (kicked). As a result, the correction of the excavation direction (posture) of the shield machine 1 may become more difficult.

  Next, Fig.7 (a)-(c) is a top view in the correction process of the digging direction (attitude | position) of another general shield machine in a soft viscous ground. In FIGS. 7B and 7C, the ground G1 and the extra excavation area D are hatched.

  FIG. 7A illustrates a case where the shield machine 1 is meandering to the left, as described above. Here, as shown in FIG. 7B, an excavation region D corresponding to the length of the front trunk plate 3a is formed on the ground on the right side of the front trunk plate 3a so that the front trunk plate 3a can easily face right. In addition, expecting the amount of the rear body plate 3b facing left, the middle folding jack on the left side is extended in the direction of arrow B3 more than usual. As a result, as shown in FIG. 7C, the front shell plate 3a of the shield machine 1 faces right as indicated by the arrow B5, and the tip (cutter head) of the shield machine 1 moves to the right. The digging direction (posture) of the digging machine 1 can be corrected.

  However, even in this case, for example, in the case of correcting the meandering in the horizontal direction at the gradient change point, the ability of the folding jack is insufficient. For example, the stroke of the bent jack is 30 mm in the vertical direction, and if 20 mm is required in the vertical direction for changing the gradient, only 10 mm can be used for left and right correction. For this reason, the digging direction (posture) of the shield machine 1 may not be properly corrected.

  Next, an example of direction (posture) correction control in the shield machine 1 according to the present embodiment will be described with reference to FIG. FIGS. 8A to 8C are plan views during the direction (posture) correction control process of the shield machine according to the present embodiment in the soft and viscous land. In FIGS. 8B and 8C, the injection region of the solution type chemical solution injection material is hatched.

  FIG. 8A illustrates a case where the shield machine 1 is meandering to the left, as described above. In the present embodiment, similarly to the above, the left bent jack 9a (see FIG. 1 and the like) of the shield machine 1 is extended to refract the front trunk plate 3a in the right direction, and as shown in FIG. As shown by the arrow B6, the chemical injection portion 13b on the outer peripheral side surface on the left side of the rear body plate 3b of the shield machine 1 (opposite to the refraction direction of the front body plate 3a of the shield machine 1) (FIGS. 1 and 4)) Inject the solution type chemical injection material into the ground. Thereby, since the injection pressure of the solution type chemical solution injection material is applied to the left side surface of the rear cylinder plate 3b, the front cylinder plate 3a can easily face the right side. Further, since the rear end of the rear trunk plate 3b is restrained by the segment SG, it does not move. As a result, as shown in FIG. 8 (c), the front trunk plate 3a of the shield machine 1 turns to the right as shown by the arrow B5, and the tip (cutter head 2) of the shield machine 1 moves to the right. The digging direction (posture) of the shield machine 1 can be corrected satisfactorily.

  That is, in the present embodiment, the digging direction (posture) of the shield machine 1 is controlled by the injection pressure of the solution type chemical solution injection material from the chemical solution injection part 13b located on the opposite side to the digging direction of the shield machine 1. By doing so, the digging direction (posture) of the shield machine 1 can be well corrected even at the gradient change point of the soft and viscous ground.

  Moreover, since the solution type chemical solution injection material does not adhere to the shield machine 1 by using the solution type chemical solution injection material as the injection material injected from the chemical solution injection unit 13b, the digging direction (posture) of the shield machine 1 is corrected. The work to do can be performed satisfactorily.

  Moreover, since the solution type chemical solution injection material is solidified after elapse of a predetermined time, it is possible to ensure the strength of the ground on the outer periphery of the excavation. Moreover, the solution-type chemical injection material has a small contact resistance with respect to the shield machine 1 even after solidification, and does not hinder the digging operation of the shield machine 1.

  In addition to the slope change point, the upper and lower digging directions (postures) of the shield machine 1 are properly corrected when the capability of the right-and-left middle bending jack 9a is used up to the upper limit during the sharp curve construction. In the situation where there is little room for selection of the bent jack 9a and the shield jack 9b, the digging direction (posture) of the shield machine 1 can be corrected satisfactorily.

  Furthermore, since the excavation work or the like can be reduced when the excavation direction (posture) of the shield machine 1 is corrected, the excavation direction (posture) correction operation of the shield excavator 1 can be facilitated. . Moreover, the tunnel excavation construction period by the shield machine 1 can be shortened.

  As mentioned above, the invention made by the present inventor has been specifically described based on the embodiment. However, the embodiment disclosed in this specification is an example in all respects and is limited to the disclosed technology. It should be considered not a thing. That is, the technical scope of the present invention should not be construed restrictively based on the description in the above-described embodiment, but should be construed according to the description of the scope of claims. All modifications are included without departing from the technical scope equivalent to the described technique and the gist of the claims.

  For example, in the above-described embodiment, the case where it is applied to the outer periphery support drive type shield machine has been described. However, the present invention is not limited to this and can be variously modified. For example, the center shaft drive method and the intermediate support drive method It may be applied to other shield machines.

  Further, in the above-described embodiment, the case has been described in which the bent jack is extended and the solution type chemical injection material is injected into the ground opposite to the refraction direction of the front trunk portion, but the present invention is not limited thereto. For example, prior to refracting the front torso, after injecting a solution-type chemical injection material into the ground opposite to the refraction direction of the front torso and curing the ground, the bent jack was extended and cured. It is also possible to make the jack bendable by taking the reaction force from the ground.

  In the above description, the case where the present invention is applied to a mud pressure shield shield machine has been described. However, the present invention is not limited to this. For example, the present invention is applied to a muddy water chamber provided in the apparatus main body behind the cutter head. The mud pump pumps mud water, and makes the pressure of the mud water in the mud chamber equal to the earth pressure and groundwater pressure of the face. It can also be applied to other shield machines such as a muddy water shield machine.

DESCRIPTION OF SYMBOLS 1 Shield machine 2 Cutter head 3 Main body 3a Front trunk plate 3b Rear trunk plate 3c Tail seal 4 Chamber 9a Middle bending jack 9b Shield jack 13a Additive injection part 13b Chemical liquid injection part SG Segment

Claims (8)

  A shield machine having injection means for injecting an injection material into the ground on the side surface opposite to the direction of refraction when the front body part constituting the apparatus main body is refracted when controlling the direction of excavation. The injection means includes
A plurality of injection portions that are arranged in a distributed manner along the outer periphery of the device main body on the side surface of the device main body, and inject the injection material into the ground from the side surface of the device main body;
Of the plurality of injection units, a control unit that controls to inject the injection material from an injection unit located on the opposite side to the refractive direction of the front body part;
The shield machine according to claim 1, comprising:   3. The shield machine according to claim 2, wherein the injection part is provided at least vertically and horizontally on an outer periphery of a rear body part that supports the front body part in a freely refracting state.   The shield machine according to claim 1, 2 or 3, wherein the injection material is a solution type chemical injection material.   A step of injecting an injection material into the ground on the opposite side to the direction of refraction when refracting the front body part constituting the device body of the shield machine during control of the direction of the shield machine. Shield digging method. A plurality of injection portions that are arranged in a distributed manner along the outer periphery of the device main body on the side surface of the device main body, and inject the injection material into the ground from the side surface of the device main body;
Of the plurality of injection units, a control unit that controls to inject the injection material from an injection unit located on the opposite side to the refractive direction of the front body part;
The shield excavation method according to claim 5, further comprising:   7. The shield digging method according to claim 6, wherein the injection part is provided at least vertically and horizontally on an outer periphery of a rear trunk part that supports the front trunk part in a state where it can be bent.   The shield drilling method according to claim 5, 6 or 7, wherein the injection material is a solution type chemical injection material.

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