JP5426271B2 - Cutter maintenance device for shield machine - Google Patents

Description

  The present invention relates to an apparatus for maintaining equipment such as a bit, a copy cutter, and a ground exploration device attached to a cutter frame of a shield machine.

  Maintenance of equipment such as bits, copy cutters, and ground exploration devices attached to the cutter frame of shield machine in the soil is because there is earth and sand water around the cutter frame. It is difficult if you do not.

  Conventionally, as described in Patent Document 1, as a technique for exchanging a bit attached to a cutter frame, a cutter frame is formed hollow, and a center shaft pivotally supported by a partition wall is made hollow. The front end of the shaft is connected to the back part of the hollow cutter frame so that the inside communicates with each other, and the operator passes through the inside of the hollow center shaft from the rear of the partition wall and enters the working space inside the hollow cutter frame to exchange bits. This is known.

  Further, as described in Patent Document 2, a cutter frame is formed in a hollow shape, and a cylinder for a maintenance passage is slidably attached to the partition wall in the front-rear direction, and the cylinder is advanced to move the front end to the cutter frame. An operator who presses against the back of the wall and enters the back of the cutter frame through the cylinder from the rear of the partition wall opens the manhole provided on the back of the work, enters the work space in the cutter frame, and replaces the bit. There is known one that performs maintenance such as a copy cutter.

JP-A-62-111494 Japanese Patent No. 4239975

  By the way, in the former technique, since the operator enters the inside of the hollow cutter frame through the hollow center shaft, the cutter frame is divided into a central cutter frame and an outer cutter frame in the radial direction, It cannot be applied to a so-called multi-cutter shield machine in which these are separately driven to rotate.

  That is, in the case of a multi-cutter shield machine, if the central cutter frame is made hollow and connected to the hollow center shaft, the operator can enter the central cutter frame through the hollow center shaft. Since the cutter frame is separated, even if the outer cutter frame is hollow, an operator in the central cutter cannot enter the outer cutter, and the bit of the outer cutter cannot be exchanged.

  In the latter technique, the maintenance passage cylinder supported by the partition wall is moved forward, its front end is pressed against the back surface of the cutter frame to stop water, and the manhole on the back surface is opened. Therefore, in order to avoid water intrusion into the cutter frame, it is necessary to pay sufficient attention to the water stoppage between the front end of the cylinder and the back part of the cutter frame, and in addition, to slide the cylinder Therefore, the structure becomes complicated and cost increase is inevitable.

  The purpose of the present invention created in view of the above circumstances is that a worker can easily enter the working space in the cutter frame on the outer peripheral side from the pit even if the cutter frame is a multi-cutter in which the cutter frame is divided inward and outward in the radial direction. And it is providing the cutter maintenance apparatus of the shield machine which can prevent the flooding to the working space with a simple structure at low cost.

In order to achieve the above object, a cutter maintenance device for a shield machine according to the present invention is a hollow cutter frame having a work space for maintaining equipment such as a bit, a copy cutter, and a ground exploration device. A swiveling ring disposed behind the cutter frame and driven to rotate by a driving means; and a plurality of swiveling rings attached to the swiveling ring at intervals in the circumferential direction, each extending forward and connected to the cutter frame. An intermediate support member formed therein with a worker passage communicating with the work space, and a rotary partition wall supported by at least one of the intermediate support member and the swivel ring and partitioning the face and the inside of the shaft And an access passage that is provided in the intermediate support member so as to extend rearward of the rotary partition and communicates with the worker passage. An access member which is formed, in the access member, provided located behind the rotary partition wall, and a doorway leading to the access passageway, said cutter frame, connecting the front end of the respective intermediate supporting members ring A hollow intermediate ring having a circumferential passage formed therein and having a circumferential passage communicating with the worker passage, and a plurality of intermediate rings attached to the intermediate ring at intervals in the circumferential direction, each extending in a radial direction. A hollow cutter spoke, and the working space is provided in the cutter spoke in communication with the circumferential passage of the intermediate ring .

  The cutter pork is formed to extend radially outward from a predetermined position between the rotation center of the cutter frame and the rotation outer peripheral end, and is radially inward from the rotation inner peripheral end of the cutter spoke. A hollow central cutter frame in which a central working space for workers is formed is disposed, and a hollow which is rotatably driven by another driving device through the rotating partition wall in a rotatable manner at the back of the central cutter frame. A central access passage connected to the central working space is provided along the axial direction, and the central access passage is located behind the rotating partition wall in the center shaft. You may provide the doorway leading to.

  According to the cutter maintenance device of the shield machine according to the present invention, even if the cutter frame is a multi-cutter that divides the cutter frame radially inward and outward, an operator can easily enter the work space in the cutter frame on the outer peripheral side from the pit. In addition, it is possible to prevent inundation of the work space with a simple structure at low cost.

It is explanatory drawing of the shield machine provided with the cutter maintenance apparatus which concerns on one Embodiment of this invention, and is the II sectional view taken on the line of FIG. It is a front view of the shield machine of FIG.

  An embodiment of the present invention will be described with reference to the accompanying drawings.

  As shown in FIGS. 1 and 2, the cutter maintenance device 2 of the shield machine 1 according to the present embodiment is formed in a hollow shape and maintains equipment such as a bit 3, a copy cutter 4, and a ground exploration device. A cutter frame (outer cutter frame) 6 having a working space 5 for rotation, a swiveling ring 8 disposed behind the outer cutter frame 6 and driven to rotate by a driving means 7, and spaced apart from the swiveling ring 8 in the circumferential direction. And an intermediate support member (intermediate beam) 10 that extends forward and is connected to the outer cutter frame 6 and in which a worker passage 9 that communicates with the work space 5 is formed. Yes.

  The cutter maintenance device 2 is supported by at least one of the intermediate beam 10 and the swiveling ring 8, and has a rotating partition 11 formed by partitioning the face and the inside of the pit, and extends to the intermediate beam 10 behind the rotating partition 11. The access member 13 is provided with an access passage 12 communicating with the worker passage 9 therein, and the access member 13 is provided behind the rotating partition wall 11. And a connecting doorway 14.

  The shield machine 1 incorporating such a cutter maintenance device 2 will be described in detail.

  A hollow ring-shaped fixed partition wall 16 is provided on the inner peripheral surface of the cylindrical shield frame 15 constituting the outer shell of the shield machine 1. The fixed partition 16 is formed in the shape of a ring plate and is substantially interposed between the front partition 16a and the rear partition 16b disposed behind the front partition 16a, and between the front partition 16a and the rear partition 16b. And a cylindrical inner peripheral wall 16c. A swiveling ring 8 is rotatably supported by the fixed partition wall 16 via a bearing 17. The swivel ring 8 is a hollow ring body having a rectangular cross section, and a seal 18 is interposed between the swivel ring 8 and the fixed partition wall 16.

  The bearing 17 includes a ring-shaped rotation-side bearing member 17a fixed to the back surface of the swivel ring 8 by a fastening means such as a bolt and a nut, and a ring-shaped fixed-side bearing member fixed to the fixed partition wall 16 by the fastening means. 17b. The fixed side bearing member 17b and the rotation side bearing member 17a are engaged with each other so as to be relatively rotatable. A gear 19 is provided in a ring shape along the circumferential direction on the outer peripheral surface of the rotation-side bearing member 17a, and the pinion of the motor 20 constituting the driving means 7 attached to the fixed partition 16 is provided on the gear 19. 21 is meshed. When the motor 20 is driven, the turning ring 8 rotates.

  A plurality of intermediate beams 10 are attached to the front portion (face side portion) of the swivel ring 8 at intervals in the circumferential direction. In the present embodiment, six intermediate beams 10 are arranged on the swiveling ring 8 at intervals of 60 degrees, but the number of the intermediate beams 10 is not limited to this number. The intermediate beam 10 is formed of a cylindrical body having a circular cross section or a rectangular shape, and one end is attached to the front portion of the swivel ring 8 and the other end is attached to the rear portion (anti-face face side portion) of the outer cutter frame 6. A member passage 9 is formed.

  A plurality of outer cutter frames 6 are attached to a hollow intermediate ring 6a formed in a ring shape by connecting the front ends of the intermediate beams 10 and a front portion of the intermediate ring 6a at intervals in the circumferential direction, and extend radially. And hollow cutout pork 6b, 6c. A circumferential passage 5a communicating with the worker passage 9 in the intermediate beam 10 is formed along the circumferential direction of the intermediate ring 6a.

  The cutter spokes 6b and 6c extend from the intermediate ring 6a not only radially outward but also radially inward by a predetermined length and from the intermediate ring 6a only radially outward. It consists of two types of short cut spokes 6c. When viewed from the front, the long cutter spoke 6b is arranged so as to overlap the intermediate beam 10, and the short cutter spoke 6c is arranged between the intermediate beams 10.

  Inside each of the long and short cut spokes 6b and 6c, a working space 5 is formed along the longitudinal direction of each spoke to communicate with the circumferential passage 5a in the intermediate ring 6a. The work space 5 is a space for maintaining equipment such as the bit 3, the copy cutter 4 and the ground exploration device provided in the long and short cut spokes 6b and 6c.

  For example, the bit 3 is inserted into a mounting hole formed in the front part of the long and short cut spokes 6b and 6c, and can be attached and detached by pulling out backward from the work space 5. Specifically, the mounting hole is provided with a shutter that closes the mounting hole in front of the bit 3 that is being pulled out before the bit 3 is completely pulled out from the mounting hole to the rear working space 5, and the bit 3 is completely pulled out. The shutter prevents the water from entering from the mounting hole.

  The copy cutter 4 digs out from the outer peripheral end of the long cutter pork 6b by a hydraulic jack so as to dig out the inside of the curve during curve excavation, and is detachable from the work space 5. A shutter similar to the shutter provided in the mounting hole of the bit 3 described above is provided in the protruding hole formed in the long cutter pork 6b so that the copy cutter 4 appears and disappears. Prevents water from entering and exiting holes when pulled out. The copy cutter 4 may be provided on the short cut spoke 6c.

  The natural ground exploration device searches an obstacle or space in the natural ground ahead using ultrasonic waves or electromagnetic waves. Although not shown in the drawings, such a ground exploration device is provided in one of the long and short cut spokes 6b and 6c, and is detachable (replaceable) inside the work space 5.

  In addition, handrails, ladders, steps, and the like (not shown) are provided inside the long and short cut spokes 6b and 6c as scaffolds or clues for workers.

  The long cutter spokes 6 b and the short cutter spokes 6 c are alternately arranged in the rotational circumferential direction of the outer cutter frame 6, and their outer peripheral ends are connected by a ring 22. A kneading blade 23 is provided on the back surface of the long and short cut spokes 6 b and 6 c, and a fixed stirring rod 24 is provided on the front surface of the fixed partition wall 16.

  A rotating partition wall 11 that partitions the face and the inside of the pit is disposed on the radially inner side and the axially rear side of the outer cutter frame 6. The rotary partition 11 is formed in a substantially cylindrical shape, and its rear end is liquid-tightly attached to the swiveling ring 8, and the rotary partition 11 is attached in a liquid-tight manner to the front end of the side rotary partition 11a that is formed in a substantially disc shape. And a front rotating partition wall 11b. The rotating partition 11 rotates integrally with the outer cutter frame 6 and partitions the face and the underground in cooperation with the fixed partition 16.

  The intermediate beam 10 is provided with a hollow access member 13 that extends from the front of the rotating partition 11 to the inner side in the radial direction and extends to the rear of the rotating partition 11. The access member 13 is notched on the outer periphery of the front rotating partition wall 11b described above. An access passage 12 that communicates with the worker passage 9 in the intermediate beam 10 is formed inside the access member 13.

  In the access member 13, an entrance / exit 14 connected to the access passage 12 is opened on the rear surface behind the rotating partition 11. The entrance / exit 14 is provided with a lid 25 that can be opened and closed. When the lid 25 is opened, the space behind the rotary partition 11 communicates with the work space 5 in the outer cutter frame 6 through the access passage 12, the worker passage 9, and the circumferential passage 5a.

  A hollow central cutter frame 26 is disposed flush with the outer cutter frame 6 on the radially inner side of the outer cutter frame 6. The central cutter frame 26 is disposed radially inward from the radially inner peripheral ends of the long and short cutter spokes 6b and 6c constituting the outer cutter frame 6, and a center block 26a disposed at the rotation center, The center block 26a has a plurality of central cutter spokes 26b that are radially attached at intervals in the circumferential direction.

  The center block 26a and the central cutter pork 26b are both formed hollow, and a central working space 27 for workers is formed inside them. The central work space 27 is a space for maintaining equipment such as a bit 28 and a ground exploration device provided in the central cutter pork 26b.

  The bit 28 provided in the central cutter spoke 26b can be exchanged from within the central work space 27 in the same manner as the bit 3 of the outer cutter frame 6. In addition, the ground excavation device of the central cutter frame 26 is detachable inside the central work space 27 in the same manner as the ground excavation device of the outer cutter frame 6. Note that it is sufficient that the ground exploration device is provided on at least one of the outer cutter frame 6 and the central cutter frame 26.

  Inside the center block 26a and the central cutter spoke 26b, handrails, ladders, steps, etc. (not shown) that serve as scaffolds or clues for workers are provided.

  A plurality of kneading blades 29 extending toward the rotary partition wall 11 (front rotary partition wall 11b) are attached to the back surface portion of the central cutter pork 26b at intervals in the radial direction. The kneading blades 29 on the outer peripheral side are attached so as to incline radially outward in order to stir the earth and sand behind the long cutter pork 6b of the outer cutter frame 6.

  A hollow center shaft 30 is mounted on the back surface of the center block 26 a of the center cutter frame 26. A central access passage 31 connected to the central work space 27 is formed in the center shaft 30 along the axial direction.

  The center shaft 30 penetrates the rotary partition wall 11 in a rotatable manner, and is pivotally supported coaxially with the swiveling ring 8 on a partition wall 32 disposed behind the rotary partition wall 11. The partition wall 32 is attached to the fixed partition wall 16, and partitions an oil bath (oil tank) 44 in cooperation with the inner peripheral wall 16 c of the fixed partition wall 16 and the rotating partition wall 11.

  A hole is formed at the center of the rotary partition 11, and a cylindrical body 34 through which the center shaft 30 is inserted is attached to the hole. A bearing 35 that pivotally supports the center shaft 30 and a seal 36 that is in sliding contact with the outer peripheral surface of the center shaft 30 are provided on the inner peripheral surface of the cylindrical body 34. A hole is also formed in the center of the partition wall 32, and a cylindrical body 37 into which the center shaft 30 is inserted is attached to this hole. A bearing 38 that pivotally supports the center shaft 30 is provided on the inner peripheral surface of the cylindrical body 37.

  On the rear outer peripheral surface of the center shaft 30, an entrance / exit 39 that is located behind the rotating partition wall 11 and the partition wall 32 and is connected to the central access passage 31 is opened. A lid 40 is provided at the entrance / exit 39 so as to be openable and closable. When the lid 40 is opened, the space in the mine behind the partition wall 32 communicates with the central work space 27 in the central cutter frame 26 via the central access passage 31.

  A drive gear 41 is mounted on the center shaft 30 between the rotary partition wall 11 and the partition wall 32, and a pinion 43 of a motor 42 constituting a drive device 33 attached to the partition wall 32 is attached to the drive gear 41. Meshed. The motor 42 that rotationally drives the center shaft 30 is independent of the motor 20 that rotationally drives the swivel ring 8 described above. When this motor 42 is driven, only the center shaft 30 is rotated, and only the central cutter frame 26 is rotationally driven.

  The rotation speed of the central cutter frame 26 is set to be higher than the rotation speed of the outer cutter frame 6. This is because the peripheral speed (cutting speed) of the bit 28 of the central cutter frame 26 is brought close to the peripheral speed (cutting speed) of the bit 3 of the outer cutter frame 6. Further, the rotation direction of the central cutter frame 26 may be opposite to the rotation direction of the outer cutter frame 6. This is because the relative speed difference between the central cutter pork 26b of the central cutter frame 26 and the front rotary partition 11b of the rotary partition 11 becomes large, and the adhesion of earth and sand between them can be suppressed.

  An oil tank 44 is formed between the partition wall 32 and the rotating partition wall 11. The oil in the oil tank 44 lubricates the gears 19, 41, the pinions 21, 43 and the like as the turning ring 8 turns. The oil level 45 in the oil tank 44 is set below the entrance / exit 46 disposed in the upper part of the partition wall 32 (for example, vertically above the center shaft 30). This is to prevent oil from flowing out when the lid 47 provided at the entrance / exit 46 is opened.

  The radial position (distance from the center shaft 30) of the entrance / exit 46 of the partition wall 32 is substantially coincident with the radial position of the entrance / exit 14 of the access member 13. This is because the swiveling ring 8 is rotated so that the doorway 14 faces the doorway 46.

  A soil removal device (screw conveyor) 48 is attached to the fixed partition wall 16. The earth removal device 48 is for removing earth and sand in a cutter chamber (earth and sand taking-in chamber) 49 in front of the fixed partition wall 16 and the rotary partition wall 11 and behind the outer cutter frame 6 and the central cutter frame 26. In addition, the soil removal apparatus 48 is not restricted to a screw conveyor, A transmission / drainage pipe | tube may be sufficient.

  The shield frame 15 is provided with an erector for assembling the segments into a ring shape, and a plurality of shield jacks for taking the reaction force from the existing segments and moving the shield frame 15 forward.

  The operation of the cutter maintenance device 2 of the shield machine 1 according to this embodiment will be described.

  The shield machine 1 shown in FIGS. 1 and 2 rotates the outer cutter frame 6 by a motor 20 and rotates the central cutter frame 26 by another motor 42, and presses the shield jack against an existing segment to extend. By doing, dig a natural mountain. During the excavation, the lid 25 provided at the entrance 14 of the access member 13 and the lid 47 provided at the entrance 46 of the partition wall 32 are both closed. This prevents oil in the oil tank 44 from entering the work space 5 in the outer cutter frame 6 from the entrance / exit 14 via the access passage 12 and the worker passage 9 and from the entrance / exit 46 to the partition wall 32. It is prevented from flowing out into the pit behind. Further, the lid 40 provided at the entrance / exit 39 on the outer peripheral surface of the rear portion of the center shaft 30 is not used and is closed.

  When maintenance (replacement, inspection) such as the bit 3, the copy cutter 4 and the ground exploration device attached to the outer cutter frame 6 is performed, first, the outer cutter frame 6 is appropriately rotated so that one of the access members 13 The provided entrance / exit 14 is made to oppose the entrance / exit 46 provided in the upper part of the partition wall 32, and the rotation position of the outer cutter frame 6 is fixed at that position by rotating the motor 20 or the like. Thereafter, the lid 47 of the entrance / exit 46 of the partition wall 32 is opened from the inside of the pit, and the lid 25 of the entrance / exit 14 of the access member 13 is opened. Thereby, the space in the mine behind the partition wall 32 communicates with the access passage 12 inside the access member 13 through the upper space of the oil tank 44.

  Here, since the access member 13 is formed so as to extend rearward from the intermediate beam 10 toward the partition wall 32, the distance between the entrance 14 of the access member 13 and the entrance 46 of the partition wall 32 is so large. In other words, the worker can easily cross over. In addition, by opening the lid 25 so as to be tilted to the front in the same manner as the lid 47, the lid 25 becomes a bridge that bridges the entrances 14 and 46.

  A worker who has entered the access passage 12 in the access member 13 through the entrance 46 of the partition wall 32 and the entrance / exit 14 of the access member 13 from the inside of the mine shaft is surrounded by the worker passage 9 in the intermediate beam 10 and the inner ring 6a. The working space 5 in the long and short cut spokes 6b, 6c is reached through the direction passage 5a, and the equipment such as the bit 3, the copy cutter 4 and the ground exploration device provided in the spokes 6b, 6c is exchanged and inspected. At this time, the rotation of the central cutter frame 26 is stopped.

  In the present embodiment, since the intermediate beam 10 is disposed on the back surface of the long cutter spoke 6b, the worker in the worker passage 9 of the intermediate beam 10 can quickly work the work space 5 in the long cutter spoke 6b. 2 and through the circumferential passage 5a in the intermediate ring 6a as shown by the broken line arrow in FIG. 2, the work space 5 in the adjacent short-cut spoke 6c or further in the adjacent long-cut spoke 6b It is possible to enter the work space 5.

  According to the cutter maintenance device 2 according to the present embodiment, the work space 5 in the outer cutter frame 6 includes a worker passage 9 for the intermediate beam 10, an access passage 12 for the access member 13, an entrance / exit 14 for the access passage 12, and a partition. The structure communicates with the space in the mine behind the partition wall 32 through the entrance 46 of the wall 32. Therefore, only by opening the lid 47 of the entrance / exit 46 and the lid 25 of the entrance / exit 14, the space in the mine and the work space 5 in the outer cutter frame 6 communicate with each other, so that the workers in the mine can easily and quickly make the outer cutter frame 6 It is possible to enter the work space 5 inside. As a result, the work time required for maintenance can be shortened, leading to a shortened construction period.

  In addition, the structure for communicating the space in the mine and the work space 5 in the outer cutter frame 6 as described above is achieved only by opening the two lids 47 and 25, as described in Patent Document 2 described above. In addition, there is no need for a large-scale mechanism in which the maintenance passage cylinder slidably supported by the partition wall is advanced by the actuator and pressed against the back surface of the cutter frame. Therefore, compared with the thing of patent document 2, a structure becomes remarkably simple and becomes very low-cost.

  Further, the cutter maintenance device 2 has a structure in which the outer cutter frame 6, the intermediate beam 10, and the access member 13 are integrated by welding or the like, and a worker passage is integrally formed in a liquid-tight manner therein. It has become. Therefore, the possibility of inundation into the work space 5 in the outer cutter frame 6 is extremely small as compared to the case in which the cylinder is pressed against the back portion of the cutter frame to ensure water stop as described in Patent Document 2. Become.

  On the other hand, when maintenance (replacement, inspection) such as the bit 28 and the ground exploration device attached to the central cutter frame 26 is stopped, the rotation of the central cutter frame 26 is stopped and the doorway opened to the outer peripheral surface of the rear portion of the center shaft 30 Open the lid 40 of 39. As a result, the space in the mine behind the partition wall 32 communicates with the central work space 27 in the central cutter frame 26 via the central access passage 31 in the center shaft 30.

  Therefore, workers in the mine can enter the central access passage 31 in the center shaft 30 through the entrance / exit 39 and enter the central work space 27 in the central cutter frame 26. The worker who has entered the central working space 27 performs maintenance (replacement and inspection) on the bits 28 and the ground exploration device provided on the central cutter frame 26. At this time, the rotation of the outer cutter frame 6 is stopped.

  Thus, according to the cutter maintenance device 2 of the shield machine 1 according to the present embodiment, even a multi-cutter in which the cutter frame is divided into the outer cutter frame 6 and the central cutter frame 26 in the radial direction inside and outside can be operated. An operator can easily enter the work space 5 in the outer cutter frame 6 from the inside of the pit and can prevent water from entering the work space 5 in the outer cutter frame 6 with a simple structure at low cost. In addition, a worker can easily enter the central work space 27 in the central cutter frame 26.

  Therefore, equipment such as the bits 3 and 28, the copy cutter 4 and the ground exploration device provided on the outer cutter frame 6 and the central cutter frame 26 can be properly maintained, and can cope with long-distance excavation.

DESCRIPTION OF SYMBOLS 1 Shield machine 2 Cutter maintenance device 3 Bit 4 Copy cutter 5 Work space 5a Circumferential passage 6 Cutter frame (outer cutter frame)
6a Intermediate ring 6b Katsuta pork (Long Katus pork)
6c Cutter Pork (Short Cutter Pork)
7 Drive means 8 Swivel ring 9 Worker passage 10 Intermediate support member (intermediate beam)
DESCRIPTION OF SYMBOLS 11 Rotating partition 12 Access passage 13 Access member 14 Entrance / exit 26 Central cutter frame 27 Central work space 30 Center shaft 31 Central access passage 33 Another drive device 39 Entrance / exit

Claims (2)

A cutter frame that is hollow and has a work space for maintaining equipment such as a bit, a copy cutter and a ground exploration device inside;
A swivel ring disposed behind the cutter frame and driven to rotate by drive means;
A plurality of intermediate support members attached to the swivel ring at intervals in the circumferential direction, each extending forward and connected to the cutter frame, and having a worker passage formed therein and communicating with the work space; ,
A rotating partition wall supported by at least one of the intermediate support member and the swivel ring and formed by partitioning a face and a pit;
An access member provided in the intermediate support member so as to extend rearward from the rotating partition wall, and an access passage communicating with the worker passage is formed therein;
The access member is provided behind the rotating partition wall, and includes an entrance / exit that leads to the access passage ,
The cutter frame is
A hollow intermediate ring formed in a ring shape connecting the front ends of each intermediate support member, and having a circumferential passage communicating with the worker passage inside;
A plurality of circumferentially spaced intermediate rings, each having a hollow cut spoke extending in the radial direction;
A cutter maintenance device for a shield machine, wherein the working space is provided inside the cutter pork so as to communicate with a circumferential passage of the intermediate ring . The cutter pork is formed to extend radially outward from a predetermined position between the rotation center of the cutter frame and the rotation outer peripheral end,
A hollow central cutter frame in which a central working space for workers is formed inside is arranged radially inward from the rotation inner peripheral end of such a cutter pork,
A hollow center shaft is provided on the back surface of the central cutter frame so as to pass through the rotary partition wall in a rotatable manner and is driven to rotate by another driving device.
A central access passage connected to the central work space is provided in the center shaft along the axial direction.
The center shaft is provided behind the rotating partition wall and provided with an entrance / exit leading to the central access passage.
The cutter maintenance apparatus of the shield machine according to claim 1 .

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