JP2012225127A - Shield machine with facilitated recovery work for diversion - Google Patents

Abstract

PROBLEM TO BE SOLVED: To withdraw sections of a shield machine, as many as possible, without disassembling from a shield tunnel to facilitate diversion work.SOLUTION: An inventive shield machine comprises: an outer shell part (skin plates 11, 21); an inner shell part (cutter inner peripheral part 12d, cutter driving part 15, erector device 24) detachably housed in the outer shell part; a gripper unit 40 equipped with a gripper 43, which is movable in the radial direction of an existing shield tunnel, and obtaining reaction force by bringing the gripper 43 into contact with an inner face of the existing shield tunnel; and a traction jack 51 interposed between the inner shell part and the gripper unit 40 and making the inner shell part and the gripper unit 40 move in approaching direction and in separation direction by telescopic motion.

Description

  The present invention relates to a shield machine that facilitates collection work for diversion.

  A shield machine is an excavator for constructing a shield tunnel. The production of this shield machine takes days, and since the shield machine is expensive, the used shield machine is collected and diverted. When collecting shield machines, dividing them into as large units as possible can reduce the man-hours required to produce shield machines at the diversion destination, resulting in a significant cost reduction effect. However, the shield machine does not have a structure suitable for collection, and it is general to cut and disassemble valuable parts such as a drive unit, an erector, and a screw conveyor for each part.

  Patent Document 1 discloses a shield machine improved to be suitable for dismantling. That is, this Patent Document 1 discloses a double-cylinder shield machine composed of an outer cylinder and an inner cylinder, in which the inner cylinder is pulled out and collected from the outer cylinder. Yes. In this shield machine, an inner cylinder is placed on a rail laid in a shield tunnel, and the inner cylinder is recovered by pulling from the rear side with an appropriate pulling means.

JP 2005-133468 A

  In the shield machine described in the above-mentioned patent document, when a widely used wire is used as the pulling means, the wire may be cut during towing. Further, since the pulled out inner cylinder body is run on the rail, the inner cylinder body may come into contact with the inner wall surface of the shield tunnel and cannot be pulled out in a sharply curved section. Furthermore, since the screw conveyor is transported in a state separated from the inner cylinder, separation work in the mine and assembly work at the diversion destination are required, which may increase the number of man-hours for production.

  The present invention has been made in view of such circumstances, and its main purpose is to facilitate the diversion work by pulling out as many portions of the shield machine as possible from the shield tunnel without disassembling.

  In order to achieve the above object, a shield machine of the present invention comprises an outer shell, an inner shell accommodated in the outer shell in a detachable manner, and a gripper movable in the radial direction of an existing shield tunnel. A gripper unit that obtains a reaction force by bringing the gripper into contact with the inner surface of the existing shield tunnel, and is interposed between the inner shell portion and the gripper unit, and the inner shell portion and the gripper unit are brought close to each other by expansion and contraction. And a traction jack that moves in a direction or a separation direction.

  In the shield machine of the present invention, first, the inner shell portion is separated from the outer shell portion, and the gripper is brought into contact with the inner surface of the existing shield tunnel in a state where the traction jack is extended. Thereby, the gripper unit is fixed. Next, the traction jack is operated while the gripper unit is fixed, and the inner shell portion is pulled toward the gripper unit. Thereafter, the contact state of the gripper is released, the towing jack is operated, and the gripper is moved to the start shaft side. By repeatedly performing these steps, the inner shell portion can be pulled out to the start shaft with the decomposition of the inner shell portion kept to a minimum. As a result, when the drawn inner shell portion is diverted to another shield machine, the work can be facilitated.

  In the shield machine described above, the inner shell portion is attached to the end portion on the digging direction side, and a slide support portion that supports the gripper unit in a slidable state is provided on the end portion on the opposite side to the digging direction. And it is preferable to provide the back trolley comprised so that driving | running | working in the said existing shield tunnel is possible. In this case, since the inner shell portion and the gripper unit are attached via the rear carriage capable of traveling in the existing shield tunnel, traveling resistance is reduced and the inner shell portion can be easily pulled out.

  In the above shield machine, when one end of the tow jack is connected to the slide support portion and the other end of the tow jack is connected to the gripper unit, the tow jack can be expanded and contracted with a simple configuration. Can act on.

  In the shield machine described above, when the inner shell portion is attached to the rear carriage in a swingable state, the angle between the inner shell portion and the rear carriage changes along the curved portion of the shield tunnel. The curve portion can be smoothly advanced.

  In the shield machine described above, when the gripper includes a plurality of sub-grippers arranged in the excavation direction, and the amount of movement of each of the plurality of sub-grippers in the radial direction of the existing shield tunnel can be individually set, Since the amount of movement of the sub-gripper is determined following the curved portion of the tunnel, the necessary reaction force can be easily obtained even in the curved portion.

  According to the present invention, as many portions as possible in the shield machine can be pulled out from the shield tunnel without being disassembled, and the diversion work can be facilitated.

It is sectional drawing of a shield machine. It is a figure explaining the state from which the inner shell part was removed from the outer shell part. The left half is a view as seen from an arrow A in FIG. 1, and the right half is a view as seen from an arrow B in FIG. It is C arrow line view of FIG. It is a figure explaining the bending state of a shield machine, (a) shows the state bent in the left direction toward the shaft, and (b) shows the state bent in the right direction, respectively. It is a figure explaining a gripper unit. It is a figure explaining operation | movement of the gripper unit accompanying the collection | recovery operation | movement of an inner shell part, (a) is the state which the gripper moved to the center side of an apparatus, (b) is the state which the gripper is pressing the tunnel inner surface. Each is shown. (A)-(e) is a figure explaining the collection | recovery operation | movement of an inner shell part in time series. It is a figure explaining a mode that an inner shell part, a back trolley | bogie, and a gripper unit are moving the curve part in a shield tunnel.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, the configuration of the shield machine will be described. The shield machine shown in FIG. 1 includes a front body part 10, a rear body part 20, a rear carriage 30, and a gripper unit 40. In the following description, the excavation direction of the shield machine is also referred to as the front, and the start vertical shaft side opposite to the excavation direction is also referred to as the rear.

  The front trunk portion 10 is a portion located on the front side of the shield machine, and the rear trunk portion 20 is a portion located on the rear side of the shield machine. The front end portion of the rear body portion 20 is fitted inside the rear end portion of the front body portion 10 and is attached in a state where the front body portion 10 and the rear body portion 20 can be bent.

  A cylindrical skin plate 11 as an outer shell portion is provided on the outer peripheral portion of the front barrel portion 10, and a cutter portion 12 is provided on the front end portion of the front barrel portion 10. The cutter unit 12 includes a disk-shaped member 12a provided with a large number of cutter bits, and an arm member 12b that supports the disk-shaped member 12a. The disk-shaped member 12a has a ring-shaped cutter outer peripheral part 12c located on the outer peripheral side, and a disk-shaped cutter inner peripheral part 12d that fits in the inner space of the cutter outer peripheral part 12c. These cutter outer peripheral part 12c and cutter inner peripheral part 12d are integrated by joining means such as welding and bolting, and excavation of the ground is performed in the integrated state.

  As shown in FIG. 2, after completion of excavation, the cutter outer peripheral portion 12c and the cutter inner peripheral portion 12d are separated from each other by cutting the welded portion or removing the bolt. Then, the cutter inner peripheral portion 12d is pulled back to the start shaft side and collected together with the rear carriage 30, the gripper unit 40, and the like. On the other hand, the cutter outer peripheral portion 12c is carried out in a disassembled state. The collection operation after completion of excavation will be described later.

  As shown in FIG. 1, a front shell middle shell portion 13 is attached along the inner surface of a skin plate 11 included in the front barrel portion 10. As shown in FIG. 3, the front shell middle shell portion 13 is a steel ring-shaped member, and is provided over the entire circumference of the skin plate 11. The front shell middle shell portion 13 of the present embodiment has a two-layer structure laminated in the radial direction. That is, it has the outer peripheral side front shell middle shell part 13a located on the outer peripheral side and the inner peripheral side front trunk middle shell part 13b located on the inner peripheral side. As shown in FIG. 1, a plurality of middle-folded jacks 14 are attached to the inner peripheral side front trunk middle shell portion 13 b toward the rear side.

  A cutter driving unit 15 that rotationally drives the cutter unit 12 is provided in the inner circumferential space of the front shell middle shell unit 13. As shown in FIGS. 1 and 3, the cutter drive unit 15 has a plurality of cutter drive motors 15a, transmits rotational force via the arm member 12b, and rotates the disk-like member 12a. The arm member 12 b is a plate-like member that protrudes rearward from the back surface of the cutter inner peripheral portion 12 d and is provided to attach the disk-like member 12 a to the cutter driving portion 15.

  As shown in FIG. 3, a plurality of conveying rollers 16 are provided on the outer peripheral surface of the lower half of the cutter driving unit 15 toward the outside. In the present embodiment, a total of ten conveying rollers 16 are provided, one in the direction of 3 o'clock and 9 o'clock of the timepiece and 4 in the direction of 5 o'clock and 7 o'clock. These transport rollers 16 are attached so as to be movable in the radial direction. That is, the roller jack 16a is attached so as to be able to advance and retract by expansion and contraction. During excavation of the ground, the roller jack 16a is contracted and the wheels 16b are housed. In addition, FIG. 3 has shown the accommodation state of the wheel part. At the time of collection to be described later, the roller jack 16a is extended so that the wheels 16b are in contact with the inner surface of the existing shield tunnel T. The amount of expansion / contraction of the roller jack 16a is appropriately adjusted so that the wheel 16b is in contact with the inner surface of the shield tunnel T. And in order to suppress the damage with respect to the inner surface of the shield tunnel T, the wheel 16b is produced with elastic materials, such as urethane rubber.

  As shown in FIG. 1, a cylindrical skin plate 21 as an outer shell portion is also provided on the outer peripheral portion of the rear trunk portion 20, and a rear trunk middle shell portion 22 is provided at the front end portion of the rear trunk portion 20. . As shown in FIG. 4, the rear trunk middle shell portion 22 is a steel ring-shaped member and is provided over the entire circumference of the skin plate 21. The rear trunk middle shell portion 22 is partitioned into a plurality of small chambers, and a shield jack 23 is accommodated in each small chamber. These shield jacks 23 obtain reaction force from the existing shield tunnel T, and propel the shield machine by extending from the contracted state.

  As shown in FIG. 1, an erector device 24 is provided in the inner peripheral space of the rear trunk middle shell portion 22. The erector device 24 is a mechanism for gripping a segment for assembling the shield tunnel T and transferring it to a predetermined angular position. There are various types of the erector device 24. As shown in FIG. 4, the illustrated erector device 24 has a ring-shaped support frame 24a, a rotating frame 24b, a drive motor 24c, and a gripping mechanism 24d. is doing. The support frame 24a is configured as a link-like frame that supports the rotating frame 24b in a rotatable state. The rotating frame 24b is made of a substantially U-shaped member, and is supported in a rotatable state on an inner peripheral portion of the supporting frame 24a. A plurality of drive motors 24c are provided on the support frame 24a, and generate power for rotating the rotating frame 24b. The gripping mechanism 24d is a mechanism for gripping the segment.

  As shown in FIG. 1, the rear end portion of the bent jack 14 is attached to a support frame 24a. That is, the cutter driving unit 15 and the erector device 24 are attached by a plurality of middle-folding jacks 14. And the bending state between the cutter drive part 15 and the erector apparatus 24 can be adjusted by adjusting the expansion-contraction amount of each middle folding jack 14. FIG. For example, as shown in FIGS. 5 (a) and 5 (b), it can be bent left and right in the pull back direction (upward in the figure). It can also be bent in the vertical direction.

  As shown in FIGS. 1 and 5, a plurality of conveying rollers 25 are provided in the lower half of the support frame 24a. A plurality of the transport rollers 25 are provided in the direction of 3 o'clock, 9 o'clock, 5 o'clock, and 7 o'clock of the timepiece, similarly to the transport roller 16 provided in the cutter driving unit 15. The transport roller 25 also includes a roller jack 25a and a urethane wheel 25b, and supports the wheel 25b so that the wheel 25b can be advanced and retracted by expansion and contraction of the roller jack 25a.

  As shown in FIG. 1, a connecting frame 26 is provided from the erector device 24 toward the rear side. The connection frame 26 is a part for connecting to the rear carriage 30. In this embodiment, a pin coupling portion PJ is provided on each of the rear end portion of the connection frame 26 and the rear carriage 30 and is attached so as to be rotatable with respect to each other. Thereby, as shown in FIG. 5, the erector apparatus 24 and the back trolley | bogie 30 are connected in the state which can be swung to right and left.

  Further, the screw conveyor SC is disposed from the lower end of the cutter driving unit 15 toward the obliquely upward side on the rear side. This screw conveyor SC is an apparatus for carrying out excavated earth and sand facing back. In the illustrated shield machine, the screw conveyor SC, the cutter inner peripheral portion 12d of the cutter portion 12, the cutter driving portion 15, and the erector device 24 constitute an inner shell portion, and the front barrel portion 10 is detachable. And the outer shell portion of the rear trunk portion 20 (that is, the skin plates 11 and 21). And this inner shell part will be collect | recovered integrally after completion of excavation (it mentions later).

  Next, the rear carriage 30 and the gripper unit 40 will be described. The rear carriage 30 shown in FIGS. 1 and 5 is a carriage pulled by the front trunk section 10 and the rear trunk section 20, and is equipped with necessary equipment such as an operation panel. At the bottom of the rear carriage 30, a transfer roller 31 that is in contact with the inner surface of the shield tunnel T is provided. The transport roller 31 is configured in the same manner as the transport roller 16 provided in the cutter driving unit 15. That is, when the roller jack 31a expands and contracts, the urethane wheel 31b travels along the inner surface of the shield tunnel T.

  As described above, the pin coupling portion PJ is provided at the front end portion of the rear carriage 30 and is coupled to the connection frame 26 by pins. On the other hand, a slide support portion 32 protrudes rearward from the rear end portion of the rear carriage 30. As shown in FIG. 1, the slide support portion 32 is a member that supports the gripper unit 40 in a state in which the gripper unit 40 is movable in the front-rear direction, and is configured by a steel frame assembled in a rectangular frame shape, for example.

  As shown in FIG. 6, the gripper unit 40 includes a sliding frame 41, a gripper fixing frame 42, and a gripper 43. The sliding frame 41 is a portion that slides with respect to the slide support portion 32. In the present embodiment, the slide frame 41 is made of a rectangular tube member that surrounds the slide support portion 32 from the outer peripheral side. The gripper fixing frame 42 is a cylindrical member provided between the gripper 43 and the sliding frame 41. The gripper fixing frame 42 of this embodiment is made of a cylinder having an octagonal cross section.

  The sliding frame 41 is attached to the gripper fixing frame 42 via connecting members 44 provided on the upper surface and the lower surface of the sliding frame 41, respectively. The fixing part of the gripper fixing frame 42 in the connecting member 44 is constituted by a rotating shaft. And the fixing | fixed part which the upper connection member 44 has and the fixing | fixed part which the lower connection member 44 has are arrange | positioned coaxially. Therefore, as shown in FIG. 5, the gripper fixing frame 42 is attached so as to be rotatable about the fixing portion of the connecting member 44.

  As shown in FIG. 6, the gripper 43 protrudes outward from the upper surface, the lower surface, and the left and right side surfaces of the gripper fixing frame 42. That is, each gripper 43 is provided at intervals of 90 degrees. The gripper 43 includes a gripper jack 43a and a gripper shoe 43b.

  The gripper jack 43a is a part that moves the gripper shoe 43b in the forward and backward direction by expansion and contraction. That is, the gripper shoe 43 b is moved to the inner surface side of the shield tunnel T by extending the contracted gripper jack 43 a. On the other hand, the gripper shoe 43b is moved to the gripper fixing frame 42 side by contracting the extended gripper jack 43a.

  The gripper shoe 43b is a member that abuts against the shield tunnel T and functions as a slip stopper so that the gripper 43 does not slip when the inner shell is recovered after excavation of the shield tunnel T. That is, the gripper unit 40 is fixed to the shield tunnel T by further pressing the gripper shoe 43b toward the shield tunnel side by the gripper jack 43a in a state where the gripper shoe 43b is in contact with the inner surface of the shield tunnel T.

  When the gripper jack 43a is contracted from the state in which the gripper shoe 43b is in contact with the inner surface of the shield tunnel T, the gripper shoe 43b is separated from the inner surface, and a space can be formed between the two. Thereby, the gripper unit 40 can be moved inside the shield tunnel T. When constructing the shield tunnel T, it is necessary to secure a space through which the segments pass. For this reason, the gripper 43 (lower gripper 43U) attached to the lower surface of the gripper fixing frame 42 may be configured to be detachable and removed when the shield tunnel T is constructed to secure a space through which the segment passes.

  As shown in FIG. 1, each gripper 43 includes a plurality of sub-grippers 43 c arranged in the excavation direction. Each of these sub-grippers 43c is composed of a set of a gripper jack 43a and a gripper shoe 43b, and the amount of movement of the gripper shoe 43b (that is, the amount of movement of the shield tunnel T in the radial direction) can be set individually. Accordingly, the amount of movement of the sub gripper 43c is determined following the curved portion of the shield tunnel T, and a necessary reaction force can be easily obtained even in the curved portion.

  A pulling jack 51 is provided inside the slide support portion 32. The pulling jack 51 is a member that is interposed between the inner shell portion and the gripper unit 40 and moves the inner shell portion and the gripper unit 40 in the proximity direction or the separation direction by expansion and contraction. In the present embodiment, as shown in FIG. 6, a pair of left and right traction jacks 51 are provided. As shown in FIG. 1, the front end of the tow jack 51 is connected to the slide frame 41 of the gripper unit 40, and the rear end is connected to the slide support portion 32. For this reason, the gripper unit 40 moves on the slide support part 32 according to the expansion / contraction state of the tow jack 51. For example, when the tow jack 51 is in a contracted state, the gripper unit 40 is located at the rear end portion of the slide support portion 32. On the contrary, when the traction jack 51 is in the extended state, the gripper unit 40 is located at the front end portion (that is, the end portion on the rear carriage 30 side) of the slide support portion 32.

  Next, the work by the shield machine having the above configuration will be described. This shield machine is characterized by a collection operation after the construction of the shield tunnel T is completed. For this reason, the collection | recovery operation | work of a shield machine is demonstrated.

  First, refer to FIG. When the shield tunnel T is constructed, the rear trunk middle shell portion 22 is disassembled and carried out. Then, the outer peripheral side front trunk middle shell part 13a and the inner peripheral side front trunk middle shell part 13b are separated. Separation of the outer peripheral side front shell middle shell portion 13a and the inner peripheral side front shell middle shell portion 13b is performed by, for example, removing a fixing bolt. Furthermore, the cutter outer peripheral portion 12c and the cutter inner peripheral portion 12d of the disc-like member 12a are separated. This separation operation is performed by cutting with a burner or removing a fixing bolt. As a result, the inner shell portion (cutter inner peripheral portion 12d, cutter drive portion 15, erector device 24, screw conveyor SC) of the shield machine is separated from the outer shell portion (each skin plate 11, 21), and the rear carriage 30 and the gripper are separated. It becomes movable with the unit 40.

  Thereafter, the gripper jack 43a is extended while the tow jack 51 is contracted. As a result, as shown in FIGS. 7A and 7B, the gripper shoe 43b located at a position away from the inner surface of the shield tunnel T is brought into contact with the inner surface of the shield tunnel T and pressed from the gripper jack 43a. Thus, the gripper unit 40 is fixed to the shield tunnel T. When the gripper unit 40 is fixed, the tow jack 51 is extended. Thereby, as shown in FIG. 2, the inner shell part is moved to the rear side (starting shaft side) together with the rear carriage 30.

  Thereafter, the movement of the inner shell and the like by the tow jack 51 and the movement of the gripper jack 43a are alternately repeated. For example, as shown in FIG. 8A, by retracting the traction jack 51 while the gripper jack 43a is contracted, the gripper unit 40 is moved to the rear of the slide support portion 32 without changing the position of the inner shell. It can be moved to the end. And as shown in FIG.8 (b), the gripper unit 40 can be fixed to the shield tunnel T by extending | stretching the gripper jack 43a from this state. Furthermore, as shown in FIG.8 (c), an inner shell part etc. are moved to the back side by extending the traction jack 51 in the state which fixed the gripper unit 40. FIG. When the inner shell or the like is moved, the gripper jack 43a is contracted as shown in FIG. 8 (d), and the traction jack 51 is contracted as shown in FIG. 8 (e).

  Note that, in the curved portion of the shield tunnel T, as shown in FIG. 9, the rear carriage 30 and the inner shell portion are connected in a swingable state by the pin coupling portion PJ. Bend together. Here, the curvature of the curve portion is a curvature that can be excavated by a shield machine. Since the traveling direction is only reversed at the time of recovery of the inner shell portion, etc., the inner shell portion and the like can surely pass through this curved portion.

  Further, in the gripper unit 40, each gripper 43 includes a plurality of sub-grippers 43c arranged in the digging direction, so that the extension amount of the gripper jack 43a of each sub-gripper 43c is adjusted along the inner surface of the shield tunnel T. As a result, the gripper unit 40 can be reliably fixed in the shield tunnel T even in the curved portion. In addition, since the sliding frame 41 and the gripper fixing frame 42 are rotatably attached, the fixing can be reliably performed also in this respect.

  As described above, according to the shield machine of the present embodiment, the rear carriage 30, the gripper unit 40, and the traction jack 51 are provided on the rear side of the inner shell portion, and the inner shell portion is moved to the start shaft by these mechanisms. Can be moved. That is, most of the cutter unit 12 excluding the cutter outer peripheral part 12c, the cutter drive unit 15, the erector device 24, and the screw conveyor SC can be moved to the start shaft without disassembling. Thereby, when diverting the inner shell part, the rear carriage 30 or the like to another shield machine, the work can be facilitated.

  Further, since the inner shell portion and the gripper unit 40 are attached via the rear carriage 30 capable of traveling in the existing shield tunnel T, traveling resistance is reduced and the inner shell portion can be easily pulled out.

  The above description of the embodiment is for facilitating the understanding of the present invention, and does not limit the present invention. The present invention can be changed and improved without departing from the gist thereof, and the present invention includes equivalents thereof. For example, you may comprise as follows.

  In the shield machine described above, the traction jack 51 is arranged on the slide support portion 32 and the inner shell portion and the gripper unit 40 are moved. However, the arrangement location of the traction jack 51 is not limited to the slide support portion 32. As long as the inner shell and the gripper unit 40 can be moved, they may be arranged at other positions. In short, the tow jack 51 only needs to be interposed between the inner shell portion and the gripper unit 40.

  In the shield machine described above, the gripper unit 40 and the inner shell portion are connected via the rear carriage 30 provided with the slide support portion 32. Here, in the case of a small shield machine in which the operation panel or the like is provided integrally with the inner shell portion, the slide support portion 32 is provided at the rear end of the inner shell portion, and the gripper unit 40 and the traction jack 51 are provided. It may be attached.

  In the above-described shield machine, the connecting frame 26 of the inner shell portion and the rear carriage 30 are connected by the pin connecting portion PJ so that they can be swung, but other connecting mechanisms can be used as long as they can be swung in a swingable state. Good.

  The above-described shield machine has been illustrated as an example of constructing a shield tunnel T having a curved portion. However, in the case of a straight shield tunnel T, a swing coupling portion such as a pin coupling portion PJ is unnecessary. Moreover, although the structure divided | segmented into the some sub gripper 43c was illustrated regarding the gripper 43, if it is the linear shield tunnel T, it is not necessary to divide | segment into the sub gripper 43c.

DESCRIPTION OF SYMBOLS 10 ... Front trunk | drum, 11 ... Cylindrical skin plate, 12 ... Cutter part, 12a ... Disk-shaped member, 12b ... Arm member, 12c ... Cutter outer peripheral part, 12d ... Cutter inner peripheral part, 13 ... Front trunk | shell inner shell part, 13a ... Outer peripheral front shell middle shell, 13b ... Inner peripheral front shell middle shell, 14 ... Folding jack, 15 ... Cutter driving part, 15a ... Cutter driving motor, 16 ... Conveying roller, 16a ... Roller jack, 16b ... Wheel, 20 ... Rear trunk, 21 ... Cylindrical skin plate, 22 ... Rear trunk middle shell, 23 ... Shield jack, 24 ... Elector device, 24a ... Support frame, 24b ... Rotating frame, 24c ... Drive motor, 24d ... gripping mechanism, 25 ... transport roller, 25a ... roller jack, 25b ... urethane wheel, 30 ... rear carriage, 31 ... transport roller, 31a ... roller jack, DESCRIPTION OF SYMBOLS 1b ... Wheel, 40 ... Gripper unit, 41 ... Sliding frame, 42 ... Gripper fixed frame, 43 ... Gripper, 43U ... Lower gripper, 43a ... Gripper jack, 43b ... Gripper shoe, 43c ... Sub gripper, 44 ... Connecting member, 51 ... Towing jack, PJ ... Pin joint, SC ... Screw conveyor

Claims (5)

The outer shell,
An inner shell housed in the outer shell in a detachable manner;
A gripper unit comprising a gripper movable in the radial direction of the existing shield tunnel, and obtaining a reaction force by bringing the gripper into contact with the inner surface of the existing shield tunnel;
A traction jack that is interposed between the inner shell portion and the gripper unit and moves the inner shell portion and the gripper unit in a proximity direction or a separation direction by expansion and contraction;
Shield machine characterized by having.   The inner shell portion is attached to the end portion on the digging direction side, and a slide support portion for supporting the gripper unit in a slidable state is provided on the end portion on the opposite side to the digging direction, and the existing shield The shield machine according to claim 1, further comprising a rear carriage configured to be able to travel in the tunnel.   The shield machine according to claim 2, wherein one end of the tow jack is connected to the slide support portion and the other end of the tow jack is connected to the gripper unit.   4. The shield machine according to claim 2, wherein the inner shell portion is attached to the rear carriage in a swingable state. 5. The gripper includes a plurality of sub-grippers arranged in the excavation direction,
5. The shield machine according to claim 1, wherein each of the plurality of sub-grippers can individually set a movement amount in a radial direction of the existing shield tunnel. 6.

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