JP4498227B2 - Bit exchanging device for shield machine - Google Patents

Description

  The present invention relates to an exchanging apparatus for exchanging worn bits such as a preceding bit for excavation, a drill bit for excavating a ground, a roller bit for excavating a rock in a shield machine during tunnel excavation.

  Conventionally, there are, for example, Patent Documents 1 and 2 as replacement devices for worn cutter bits. Patent Document 1 discloses that a cutter pork can be tilted between a standing posture and a backward inclined posture (bending posture) from the rotation center side, and the front end portion of the cutter pork is tilted from a manhole formed in a partition wall ( It is disclosed that a bit is exchanged by being exposed to the atmosphere chamber side).

Further, in Patent Document 2, all cutter spokes are configured to be foldable rearward around the base end, a unit storage chamber is formed in the shield body, and after the cutter pork is folded, the cutter head is retracted backward. A configuration is disclosed in which the excavation bit of the cutter pork is exchanged in the unit storage chamber.
JP2002-13391 JP 2002-194994 A

  However, in Cited Documents 1 and 2, since the cutter spoke is bent and tilted, the area of the member supporting the face surface is reduced, the earth retaining action is reduced, and the risk of ground collapse may occur.

  The present invention solves the above-mentioned problems and provides a excavation bit exchanging device for a shield machine capable of exchanging a cutter bit safely and quickly while ensuring a sufficient earth retaining action when exchanging the cutter bit. With the goal.

According to the first aspect of the present invention, the shield main body is provided with a pressure partition that forms a pressure chamber at the front and an air chamber at the rear, and the cutter head is rotatably disposed at the front of the pressure chamber. A bit exchange device for a machine , provided on a spoke body constituting the cutter head and supported to be tiltable around an axis on the outer peripheral side, and tilting the guide member backward from within the spoke body a guide tilting apparatus capable, the guide member, integral with the mounting member having a bit for drilling provided detachably from freely in and free end slides in the longitudinal direction, is formed in the pressure bulkhead Te, a free end portion which can face the opening of the guide member which is inclined to the rear, opening and closing the gate device can freely open and close the opening provided in the pressure bulkhead, setting the atmospheric chamber side of the opening A sealed box that is disposed on a straight line along the length direction of the guide member tilted rearward and can store the mounting member, and the opening between the guide member and the sealed box via the opening. And a bit push / pull device capable of extracting / pushing the mounting member .

According to a second aspect of the present invention, in the configuration of the first aspect, the sealed box and the bit pushing / pulling device are detachably attached to the pressure bulkhead corresponding to the opening .

According to a third aspect of the invention, in the structure according to claim 1 or 2, provided tiltably the guide member about the axis of the tangential direction, the openings, the left and right cutter head rotation axis of the pressure bulkhead The pressure partition formed in at least one of the above and having the opening is inclined from the rotation axis side of the cutter head to the outer rear part.

According to a fourth aspect of the present invention, in the configuration according to any one of the first to third aspects, the excavation bit is selected from a preliminary bit for excavation, a drill bit for ground excavation, and a roller bit for rock excavation It is.

Invention smell of claim 1 wherein Te, as the purpose of the spoke main body is located corresponding to the opening of the pressure bulkhead, and stops the rotation of the cutter head. Then, from the spoke main body by a guide tilting device a guide member is tilted, are opposed to the free end into the opening, opening the opening portion by the opening and closing gate device, the bit push-pull device, with the used bits from the guide member The mounting member is slid along the linear direction and pulled out from the opening to the collection box. Closing the opening, a member Mounting of collection boxes, and replaced with new bits with the mounting member. Further, the opening is opened, and the mounting member is pushed out from the collection box through the opening by the bit pushing / pulling device, and is slid and mounted on the guide member along the linear direction . Next, the guide member is tilted forward and installed in the original spoke body.

Therefore, the guide tilting device leaves the spoke main body and tilts the guide member backward, whereby the earth retaining action can be secured by the spoke main body and the face face can be prevented from collapsing. In addition, the bit push-pull device slides the mounting member from the guide member inclined backward and pulls it out from the opening into the collection box, so it can be safely replaced in the atmospheric chamber with the pressure chamber and atmospheric chamber shut off. Work can be performed, and the earth pressure in the pressure chamber can be maintained to prevent the face from collapsing. Also, a tilting of the guide member by the guide tilting device, is automatically performed and a withdrawal-pushing of the mounting member by the bit push-pull device, can reduce the replacement time, it can be carried out safely replacement.

According to the second aspect of the present invention, the collection box and the bit push-pull device only when replacing, by attaching a pressure bulkhead which corresponds to the opening, it is possible to effectively utilize the space in the air chamber.

According to the invention described in claim 3 , by providing the opening on the left or right side of the cutter head rotation axis, the spoke body can be stopped in a horizontal posture and the guide member can be tilted in the horizontal direction. An extra load such as a load can be reduced, the strength of replacement parts and the power required for replacement can be reduced, and the replacement device can be reduced in weight and size.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Embodiment 1]
As shown in FIGS. 1 and 2, this shield machine has a pressure partition 2 near the front of a shield body 1 having a cylindrical skin plate 1 a, and a face collapse earth pressure at the front of the pressure partition 2. Is formed, and an air chamber 4 is defined in the rear portion of the pressure partition 2. The pressure bulkhead 2 is shielded by a central front wall 2A perpendicular to the shield axis O, a truncated cone-shaped inclined wall 2B inclined rearwardly outward from the central front wall 2A, and an outer peripheral portion of the inclined wall 2B. The outer peripheral rear wall 2C, which is perpendicular to the axis O and connected to the skin plate 1a, and the lower part of the inclined wall 2B are notched to secure the connecting surface of the earth removing device 5, and are connected from the central front wall 2A to the outer peripheral rear wall 2C. And a horizontal wall 2D.

  A cutter head 6 disposed at the front portion of the shield body 1 so as to be rotatable around the shield axis O has a leg portion 7 protruding rearward from the outer peripheral portion, and the rear end of the leg portion 7 has a swivel bearing 8. Via the outer peripheral rear wall 2C and the skin plate 1a.

  A plurality of cutter driving devices 9 for driving the cutter head 6 are installed on the rear surface of the outer peripheral rear wall 2C. The cutter driving device (hydraulic or electric motor with a speed reducer) 9a, A ring internal gear 9b attached to the rear portion and a drive pinion 9c that is rotationally driven by the cutter driving device 9a and meshes with the ring internal gear 9b.

  The earth removing device 5 includes a cylindrical casing 5a penetrating the lower part of the outer peripheral rear wall 2C, a ribbon screw 5b that is rotatably disposed in the casing 5a and can transport gravel having a large diameter, and a ribbon screw 5b. And a screw rotation drive device (not shown) for rotating and holding the earth pressure in the casing 5a while holding the earth pressure while transporting excavated sediment and gravel to the rear by the ribbon screw 5b. It consists of a screw feeder that discharges to the chamber 4. Reference numeral 10 denotes a propulsion jack that propels the shield body 1 using the assembled lining segment as a reaction force receiver.

  As shown in FIG. 3, the cutter head 6 is adopted corresponding to a hard ground with many rocks and the like, and a plurality of cutter spokes (spoke members) extending in a radial direction from a center member 6k having a center bit 6m. ) 6c, 6f, a cutter face plate 6g provided between the cutter porks 6c, 6f, and an earth and sand intake 6j. Further, the replaceable leading bit (excavation bit) 6a and the excavation bits 6b on both sides thereof are provided on the cutter pork 6c, and the roller bit 6d and the excavation bit 6b for excavating the rock mass are provided on the other cutter pork 6f. Further, the cutter face plate 6g and the sub-spoke 6h have a drill bit 6b and a roller bit 6d. Further, a copy cutter 6i for excavation is provided at a predetermined position on the outer peripheral portion.

  The bit exchanging device 11 according to this embodiment includes constituent members of the exchangeable cutspoke 6c, an opening 12 provided in the inclined wall 2B of the pressure bulkhead 2, and an opening / closing gate device 13 for opening and closing the opening 12. A sealed recovery box 14 that is pivotably attached to the atmosphere chamber 4 from the opening 12, and a bit push / pull device 15 that puts and removes the preceding bit 6 a between the cutter spoke 6 c and the recovery box 14. It has.

The bit exchanging device 11 according to this embodiment includes constituent members of the exchangeable cutspoke 6c, an opening 12 provided in the inclined wall 2B of the pressure bulkhead 2, and an opening / closing gate device 13 for opening and closing the opening 12. And a sealed recovery box (sealed box) 14 that is rotatably attached to the atmosphere chamber 4 from the opening 12 and a bit push / pull for inserting / removing the preceding bit 6a between the cutter spoke 6c and the recovery box 14 Device 15.

  That is, the spoke body 21 for exchanging bits has a storage space 21a whose front and rear surfaces are open from the central portion to the outer peripheral end side, and a guide member 22 is disposed in the storage space 21a. A bracket 25 protrudes from the rear surface of the outer peripheral end of the guide member 22, and the bracket 25 and the support body of the leg portion 7 of the spoke body 21 are rotatably supported via a tangential tilt pin 26. The guide member 22 is configured to be detachable rearward from the storage space 21a. The guide tilting device 24 comprises a hydraulic or electric jack, the jack body is rotatably supported by the leg 7, and the output rod is pin-connected to the free end side (inner end side) of the guide member 22. ing. As a result, when the cutter head 6 is stopped at a predetermined position, the guide tilting device 24 is contracted and the guide member 22 is rotated backward about the tilting pin 26 to be detached from the storage space 21a. The free end can be opposed to the opening 12.

  The guide member 22 is formed with a slide recess 22a whose front surface and free end side are open, and a guide rail 22b in the length direction projects from the left and right opposing surfaces of the slide recess 22a. An attachment member 23 is mounted on the slide recess 22a. A slide groove 23a is formed in the attachment member 23 so as to be slidably fitted to the guide rail 22b. The attachment member 23 can be detached from the free end portion. It is configured. A bit lock device 27 is provided at the free end of the guide member 22 to prevent the attachment member 23 from coming off at the mounting position.

  As shown in FIG. 8, in the bit lock device 27, a lock claw 27a is rotatably supported via a pin 27e in the width direction of the guide member 22, and a lock claw is provided by a spring 27f interposed in the pin 27e. 27a is urged to rotate in a direction approaching the attachment member 23 side indicated by an arrow. A lock groove 27b into which the lock claw 27a can be fitted is formed on the rear surface of the inner end portion of the mounting member 23. The locking claw 27a is fitted in the locking groove 27b and has a receiving surface 27c that is substantially perpendicular to the sliding direction to prevent the mounting member 23 from sliding toward the free end side, and an outer end side of the mounting member 23. An inclined surface 27d that allows sliding is formed. Therefore, when the mounting member 23 is inserted into the slide recess 22a from the free end portion, the insertion is permitted by overcoming the lock claw 27a by the inclined surface 27d, and the mounting member 23 that has reached the mounting position by the receiving surface 27c is prevented from coming off. is doing.

By the way, an unlocking mechanism 29 for releasing the locking claw 27a from being removed is provided at the inner end of the mounting member 23. The unlocking mechanism 29 is formed with a latching recess 28 for pushing and pulling the mounting member 23 on the front surface of the inner end portion of the mounting member 23. The bottom surface of the latching recess 28 and the top surface of the lock groove 27b. An insertion hole 29a is formed between the release rod 29b and the release rod 29b. The release rod 29b is urged toward the latching recess 28 by a coil spring 29c, and the passive end protrudes. As a result, a claw portion 33a of a latching claw 33 to be described later is fitted into the latching recess 28, whereby the release rod 29b is pushed through the passive end, and the lock claw 27a is pushed out from the lock groove 27b by the operating end. Thus, the lock of the mounting member 23 can be released.

The inclined wall 2B provided with the opening 12 is formed along the tangential direction of the locus of the free end when the guide member 22 is rotated, and the guide member is substantially perpendicular or perpendicular to the opening 12. 22 can be stopped oppositely. The open / close gate device 13 disposed in the opening 12 and capable of holding the earth pressure of the pressure chamber 3 is slidably disposed on the rear surface of the inclined wall 2B on the rear surface side of the atmospheric chamber 4 via a shutter guide. The shutter plate 13a and an open / close jack 13b that opens and closes the opening 12 by sliding the shutter plate 13a. A guide member fixing device that positions and fixes the free end portion of the inclined guide member 22 at a position facing the opening 12 may be provided.

  The collection box 14 is a hermetically sealed box that can accommodate the mounting member 23 and can hold the earth pressure of the pressure chamber 3, and when the bit is replaced, the opened front end faced the opening 12 and the inclined wall 2B Mounted on the atmosphere chamber 4 side. In this collection box 14, for example, the upper open / close lid 14a is openable / detachable via a fastener such as a bolt, and the extracted mounting member 23 is taken out and stored, and replaced with a new mounting member 23 with a leading bit 6a. Can do. And the protruding item | line part 14d which guides the attachment member 23 via the slide groove 23a is protrudingly provided by the pulling-pull direction on the opening-and-closing lid 14a of the collection | recovery box 14, and the inner surface of a baseplate. Further, as shown in FIG. 7B, a cleaning pipe 14b is connected to the rear end portion of the collection box 14, and an insertion port 14c is formed on the rear end surface.

  The bit push / pull device 15 automatically pulls and pulls the mounting member 23 between the guide member 22 and the collection box 14 and collects it, and the collection is arranged so as to be slidable from the insertion port 14c of the collection box 14. A rod 31, a recovery jack 32 that drives the recovery rod 31 to be moved back and forth, and a hooking / removing device 34 that rotates and engages and disengages the hooking claw 33 provided at the front end of the recovery rod 31. It is equipped with. Note that a seal member (not shown) that seals the gap with the recovery rod 31 is provided at the insertion port 14c of the recovery box 14, and the pressure chamber 3 is opened by the recovery box 14 with the open / close gate device 13 opened. The earth pressure can be maintained and flooding can be prevented.

  The recovery jack 32 has a jack body 32a attached along the length direction of the recovery box 14, and a front end portion of an output rod 32b connected to a rear end portion of the recovery rod 31 via a rear connection member 32c. A latching claw 33 is rotatably supported at the front end portion of the recovery rod 31 via a support pin 33a in the width direction, and the claw portion 33a is formed so as to be fitted into the latching recess 28. The hooking / unloading device 34 includes a hooking / removing jack 34a, an intermediate lever 34b, and an operating rod 34c. The hooking / removing jack 34a is supported by the rear connecting member 32c, and the intermediate lever 34b is supported by the rear connecting member 32c. The bracket is rotatably supported via a support shaft 34d in the width direction. The output end of the hooking / removing jack 34a is connected to the passive end of the intermediate lever 34b, and the rear end of the operating rod 34c is connected to the operating end of the intermediate lever 34b. The actuating rod 34 c is disposed in a connecting hole formed in the length direction of the collecting rod 31 so as to be able to move out of the operating rod 31 a, and the front end is pin-connected to the free end side of the latching claw 33.

Therefore, when the free end portion of the guide member 22 is stopped opposite to the opening portion 12 and the opening / closing gate device 13 is opened to connect the collection box 14 and the pressure chamber 3, the collection jack 32 of the bit push-pull device 15. And the front end portion of the recovery rod 31 protrudes into the opening 12. Then, the hooking / removing jack 34a of the hooking / unloading device 34 is advanced, the hooking claw 33 is laid down via the intermediate lever 34b and the operating rod 34c, and the hooking portion 33a is fitted into the hooking recess 28 and attached to the recovery rod 31. The member 23 is connected. At the same time, the release rod 29b is pushed out by the claw portion 33a to release the lock claw 27a from the lock groove 27b, and the bit lock device 27 is released by the lock release mechanism 29 to release the attachment member 23. Further, the recovery jack 32 is advanced, and the mounting member 23 is pulled out from the guide member 22 through the opening 12 to the recovery box 14 and recovered. The mounting member 23 of the recovery box 14 and replaced with a new leading bit 6a with mounting member 23, mounting the new mounting member 23 to the guide member 22 in the reverse order.

This will be described with reference to the bit exchange operation in the above embodiment.
1) When the shield machine reaches the bit exchange point, the target cutter pork 6c is stopped according to the corresponding position of the opening 12. Then, the guide tilting device 24 rotates the guide member 22 backward about the tilting pin 26 to disengage it from the spoke body 21, and stops the free end portion of the guide member 22 facing the opening 12.

  At this time, in the pressure chamber 3, the plastic filler is injected into the excavated earth and stirred, and the guide member 22 is tilted in a soft state. In addition, what is necessary is just to incline the guide member 22 in the space which discharged | emitted excavated earth and sand with the earth removal apparatus 5, when the ground is stable and there is no spring water.

  2) After opening and closing the gate device 13 to connect the pressure chamber 3 and the recovery box 14, the recovery rod 31 is moved closer to the guide member 22 by the recovery jack 32 of the bit push-pull device 15, The recovery rod 31 and the attachment member 23 are coupled by fitting the portion 33 a into the latching recess 28. At the same time, the bit lock device 27 is released by the lock release mechanism 29.

  3) The recovery jack 32 is advanced to retract the recovery rod 31, and the attachment member 23 is pulled out from the guide member 22 and accommodated in the recovery box 14 through the opening 12. After the opening 12 is closed by the opening / closing gate device 13, the opening / closing lid 14a is opened, the latching claw 33 is detached from the latching recess 28, and the worn attachment member 23 with the leading bit 6a is newly attached with the leading bit 6a. The mounting member 23 is replaced, and the latching claw 33 is fitted into the latching recess 28 to close the open / close lid 14a.

  4) The open / close gate device 13 is opened, the recovery jack 32 is contracted to move the recovery rod 31 forward, the new mounting member 23 is pushed out from the recovery box 14, and the slide member 22 a of the guide member 22 is inserted through the opening 12. Insert into and load. When the attachment member 23 reaches the attachment position, the attachment member 23 is prevented from being detached by the lock claw 27 a of the bit lock device 27. After the latching claw 33 is detached from the latching recess 28 and the recovery rod 31 is retracted, the opening 12 is closed by the open / close gate device 13.

5) The guide member 22 is rotated forward by the guide tilting device 24 and fitted into the storage space 21 a of the spoke body 21.
According to the above embodiment,
a) The spoke body 6c is left facing the face surface during the replacement work, and the guide member 21 is tilted rearward, so that the face face can be held and a soil retaining effect can be achieved.

  b) Since the attachment member 23 with the leading bit 6a is pulled out from the guide member 21 to the collection box 14 through the opening 12 and is collected and pushed in, the excavation bit can be exchanged safely. Further, since the mounting member 23 is linearly pulled out from the guide member 22 to the collection box 14, and is replaced by being pushed in, the occurrence of troubles is reduced.

  c) Since the worn leading bit 6a is replaced with the mounting member 23, the replacement work can be performed in a short time. Moreover, it can replace | exchange for the attachment member 23 from which the kind and arrangement | positioning of the advance bit 6a prepared previously differ, and can respond easily to the ground which excavates from now on.

  d) Since the opening 12 is arranged on the side of the shield axis O and the mounting member 23 is pulled out and pushed in a direction inclined with respect to the shield axis in a substantially horizontal plane, the space of the atmosphere chamber 4 can be used effectively. The removal of other members is unnecessary, and the captain does not become long. Furthermore, since the mounting member 23 is pulled out and pushed in a substantially horizontal plane, there is little interference with the earth removing device 5 (particularly with a small diameter specification), and less driving force is required for drawing and pushing compared to the inclined direction. The strength can also be reduced.

e) Since the recovery box 14 is attached to the opening 12 only at the time of bit replacement and is always removed, other work can be easily performed without squeezing the space in the atmosphere chamber 4. It can be carried out.
[Embodiment 2]
The second embodiment relates to a roller bit exchanging apparatus for excavating a rock, and will be described with reference to FIGS. In addition, about the same member as Embodiment 1, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The spoke body 41 for exchanging bits has a storage space 41a formed along the center, and a guide member 42 is disposed in the storage space 41a. A bracket 25 protrudes from the rear surface of the outer peripheral end of the guide member 42, and the bracket 25 and a support body of the leg portion 7 of the spoke body 41 are rotatably supported via a tangential tilt pin 26. The guide member 42 is configured to be detachable rearward from the storage space 41a.

The guide member 42 is formed with a guide groove portion 42a whose front surface and free end side are open, and the protruding strip portion 43a of the mounting member 43 having the roller bit 6d is slidable along the groove portion 42a. It is accommodated so as to be removable from the end. A bit lock device 27 is provided at the free end of the guide member 42 to prevent the attachment member 43 from coming off at the mounting position.

  According to the above-described configuration, the rock bit excavation roller bit 6d worn during excavation can be replaced in the same procedure as in the first embodiment, and the same operational effects as in the first embodiment can be achieved.

Of course, the preceding bit 6a and the roller bit 6d can be exchanged, and the exchange operation can be carried out by distributing to the same opening 12 or the left and right openings 12 respectively.
[Embodiment 3]
The third embodiment is a bit exchanging device for excavation bits, which will be described with reference to FIG. In addition, about the same member as Embodiment 1, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The spoke body 51 of the cutter spoke 6c is provided with a guide member 52 that is externally fitted to the left and right side surfaces and the rear surface so as to be detachable rearward, and the bracket 25 projects from the rear surface of the outer peripheral end of the guide member 52. The bracket 25 and the support body of the leg portion 7 of the spoke body 51 are rotatably supported via the tilt pin 26, and the guide member 52 is configured to be detachable rearward.

  Guide dovetail groove portions 52a are respectively formed in the length direction on the left and right side surfaces of the guide member 52, and mounting members 53 having excavation bits 6b are slidably accommodated in the dovetail groove portions 52a and are detachable from the free end portions. Has been. A bit lock device 27 is provided at the free end of the guide member 52 to prevent the attachment member 53 from coming off at the mounting position.

  According to the said structure, the excavation bit 6b which excavates the ground worn in the middle of excavation can be replaced | exchanged in the same procedure as Embodiment 1, and there can exist an effect similar to Embodiment 1. FIG.

  Note that the bit exchange devices of the first, second, and third embodiments can be provided integrally or selectively in the same shield machine. At this time, the openings 12 may also be formed on the left and right sides of the inclined wall 2B of the pressure partition 2.

1 is a plan sectional view of a shield machine according to a first embodiment of a cutter bit exchanging device for a shield machine according to the present invention. It is side surface sectional drawing of the shield machine. It is a front view of the shield machine. It is AA sectional drawing shown in FIG. It is BB sectional drawing shown in FIG. (A) and (b) are plane sectional views showing exchange work of a bit exchange device of the shield machine, respectively. (A) and (b) are the expanded plane sectional view and front sectional drawing which show the exchange operation | work of a bit exchange device, respectively. It is an expanded sectional view showing the bit lock device and lock release mechanism of the bit exchange device. FIG. 7 is a partial front view of a cutter head, showing Embodiment 2 of a bit exchanging device for a shield machine according to the present invention. (A) is a plane cross-sectional view of the cutter pork of the shield machine, (b) is a CC cross-sectional view shown in (a). (A) and (b) are plane sectional views showing exchange work of the bit exchange device, respectively. Embodiment 3 of the bit exchange apparatus of the shield machine according to the present invention is shown, (a) is a plan view of a cutter pork, (b) is a sectional view taken along the line DD shown in (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shield body 2 Pressure bulkhead 2B Inclined wall 3 Pressure chamber 4 Atmosphere chamber 5 Earth removal device 6 Cutter head 6a Leading bit 6b Drilling bit 6c Cutspoke 6d Roller bit 6f Cutspoke 6j Sediment intake 7 Leg part 8 Swivel bearing 9 Cutter drive Device 11 Bit exchange device 12 Opening portion 13 Opening / closing gate device 14 Collection box 14a Opening / closing lid 15 Bit push / pull device 21 Spoke body 21a Storage space 22 Guide member 22a Slide recess 23 Mounting member 24 Guide tilting device 26 Tilt pin 27 Bit lock device 27a Lock claw 27b Lock groove 28 Locking recess 29 Lock release mechanism 29b Release rod 31 Recovery rod 32 Recovery jack 33 Locking claw 34 Hooking device 41 Spoke body 41a Storage space 42 Guide member 43 Guide member 51 Spoke 51a receiving space 52 guide member 53 attachment member

Claims (4)

A shield excavator bit exchange device in which a shield body is provided with a pressure bulkhead that forms a pressure chamber at the front and an air chamber at the rear, and a cutter head is rotatably disposed at the front of the pressure chamber. ,
A guide member provided on a spoke main body constituting the cutter head and supported to be tiltable around an outer peripheral axis , and a guide tilting device capable of tilting the guide member rearward from the spoke main body ;
An integral mounting member having a bit for excavation provided in the guide member so as to be slidable in its length direction and detachable from the free end side;
An opening formed in the pressure bulkhead and capable of facing the free end of the guide member inclined rearward;
An open / close gate device provided in the pressure partition wall and capable of freely opening and closing the opening;
A sealed box that is provided on the atmosphere chamber side of the opening and is arranged on a straight line along the length direction of the guide member that is tilted rearward, and capable of storing the mounting member, and the guide member and the sealed box A bit exchanging device for a shield machine, comprising: a bit pushing and pulling device capable of extracting / pushing the mounting member through the opening . The bit exchanging device for a shield machine according to claim 1 , wherein a sealed box and a bit pushing / pulling device are detachably attached to the pressure bulkhead corresponding to the opening . Provided tiltably the guide member about the axis of the tangential direction,
An opening is formed in at least one of the left side and the right side of the cutter head rotation axis of the pressure bulkhead;
The bit exchanging device for a shield machine according to claim 1 or 2, wherein the pressure bulkhead in which the opening is formed is inclined outwardly from the rotation axis side of the cutter head. The bit exchanging device for a shield machine according to any one of claims 1 to 3, wherein the bit for excavation is selected from a preceding bit for excavating, a drill bit for excavating the ground, and a roller bit for excavating the rock.

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