JP2001040993A - Method for changing cutter bit and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for changing the cutter bit of a shield machine that is structurally simple enough to allow easy operations and maintenance and a device therefor. SOLUTION: A slide box 26 having a removable lid on its front surface is moved until abutting against a cutter spoke 7, and then the lid is removed and the slide box 26 is pressed against the cutter spoke 7. A water cutoff valve 25 inserted in the slide box 26 is aligned with a cutter bit 11 and fixed to the cutter spoke 7, and a cutter change bar is inserted into the water cutoff valve 45 and connected to the cutter bit 11; the cutter bit 11 is then unlocked and is drawn out of the water cutoff valve 45, together with the cutter change bar, and a new cutter bit 11 is connected to the cutter change bar. The new cutter bit 11 is attached to the cutter spoke 7 through a process that is approximately the opposite of the above process.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for replacing a cutter bit of a shield machine for constructing a linear underground space such as a road, a railroad or the like.

[0002]

2. Description of the Related Art As an example of a cutter bit exchanging device of this type of shield machine, there is a device described in Japanese Utility Model Laid-Open No. 5-32497. This invention is based on a moving bulkhead that is joined to a cut-spoke, a rod guide fixed in the cut-spoke, a rod with a cutter bit slidably provided in the rod guide, and a rod guide with the cutter bit. And a shutter device for opening and closing the inside of a rod guide in which a rod with a cutter bit slides and moves.

[0003] When replacing the cutter bit,
First, the moving bulkhead is joined to the rear of the cut spoke, and the rod with the cutter bit is slid with respect to the rod guide so as to retreat into the machine to a position where the ground water pressure does not leak. After closing the inside of the rod guide in front of and stopping the cutting face side, the cutter bit is removed together with the rod.

[0004] Then, a new rod with a cutter bit is inserted into the rod guide, the shutter device is opened, and the rod with the cutter bit is slid to the face side as it is, so that a predetermined position in the rod guide fixed in the cut-spoke is obtained. And replace the cutter bit (prior art 1).

In Japanese Patent Application Laid-Open No. Hei 3-202593, a partition wall is provided inside the distal end portion of a shield tube, and a radial cut-spoke is formed in front of the partition wall around a cutter shaft. It is rotatably provided, and a plurality of detachable cutter bits are protruded from the cut spokes.Each cut spoke has an outer cylinder that can be pivoted around the axial direction on its outer periphery, and this detachable cutter bit is attached to this outer cylinder. At the same time, a slide box for bit exchange work that is slidable in the front and rear direction toward Katas spokes is provided in a part of the partition wall, and this slide box is advanced, and the back of the Katas spoke is covered by the opening at the tip of the slide box. Discloses a shield propulsion machine in which a cutter bit can be attached and detached through a through hole (prior art 2).

[0006]

The invention of the prior art 1 is as follows.
The structure is complicated because the bulkhead is composed of a fixed bulkhead and a moving bulkhead, and the moving bulkhead is constructed in a movable manner. Further, since a shutter device for exchanging the cutter bit must be provided in the cutter spoke, not only the size of the cutter spoke becomes large, but also the maintenance is difficult.

In the invention of the prior art 2, since the cutter spoke must be pivotable to replace the cutter bit, the structure is complicated and maintenance is difficult.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a method of exchanging a cutter bit of a shield machine and having a simple structure and easy operation and maintenance. is there.

[0009]

According to a method of replacing a cutter bit according to the present invention, a slide box having a detachable lid on a front surface is moved until the slide box comes into contact with a cut spoke.
Removing the lid and crimping the slide box to the cut-spoke; aligning the water-stop valve inserted into the slide box with a cutter bit and fixing the water-stop valve to the cut-spoke; Inserting a replacement bar into the cutter bit and unlocking the cutter bit and unlocking the cutter bit; pulling the cutter bit out of the water stop valve together with the cutter replacement bar; Connecting the cutter bits and mounting the cutter bits on the cutter spokes in a process substantially opposite to the above-described processes.

In the above-described cutter bit replacing method, the cutter bit is replaced in a substantially funnel-shaped box attached to a cutter spoke around the cutter shaft. Further, the cutter shaft was constituted by a substantially funnel-shaped box attached to the cut spokes, and the cutter bit was replaced in this box.

[0011] The cutter bit exchanging device according to the present invention comprises:
A cutter bit having a built-in lock mechanism and detachably attached to the cut-spoke; and a detachable lid on the front surface, the cutter bit being slidably disposed in a guide installed at an opening of the bulkhead, A slide box which is moved to a spoke side to remove the lid, and which is crimped to the cut-spoke; and a water stop which is inserted into the slide box and is removably fixed to the cut-spoke in alignment with the cutter bit. It has a valve and a connecting portion for connecting the cutter bit at a tip end thereof, and a cutter replacement bar inserted into the water stop valve.

[0012] In the above cutter bit exchanging device,
It has a substantially funnel-shaped box disposed around a cutter shaft, one end of which is fixed to the cut spoke and the other end of which is rotatably supported by an opening provided in the bulkhead.
Also, one end of the cutter shaft is fixed to the cut spokes,
It consisted of a substantially funnel-shaped box whose other end was rotatably supported by an opening provided in the bulkhead.

[0013] In the above cutter bit exchanging apparatus, the lock mechanism incorporated in the cutter bit is configured so that the lock is released by connecting a cutter exchanging bar to the cutter bit.

[0014]

[First Embodiment] FIG. 1 is a front view of a first embodiment of the present invention, FIG. 2 is a sectional view taken along line AA of FIG.
FIG. 3 is an enlarged view of a main part of FIG. In the figure, reference numeral 2 denotes a cylindrical frame constituting an outer shell of the shield machine 1,
The bulkhead 3 is provided slightly inside the opening on the face side. 4 has a hydraulic motor and the like,
The cutter shaft 6 protruding to the face side is sealed by an earth and sand seal 5 provided on the bulkhead 3, and a cutter spoke 7 is attached to the cutter shaft 6.

A plurality of cylindrical cutter holders 8 are linearly provided on the cutter spoke 7 from the outer periphery toward the center (hereinafter referred to as a cutter holder row), and the cutter holder rows are radially arranged at substantially equal intervals. A plurality of rows (three rows are shown in the figure) are provided. In each of the cutter holders 8, a cutter bit 11 having a cylindrical shape and having a cutter at a distal end portion is detachably mounted. Reference numeral 9 denotes a pin hole provided on the cutter holder 8 facing the same, and reference numeral 10 denotes a seal member.

In the cutter bit 11, reference numeral 12 denotes a lock mechanism provided therein, which comprises a pair of lock pins 13 and a spring 14 interposed between the lock pins 13, and the lock pins 13 are inserted and retracted freely. , A hydraulic chamber 15 filled with hydraulic oil therein, and a cylinder 1 connected to the hydraulic chamber 15
6, and a connecting portion 17 having a connecting hole 18 provided on the rear side. A rod of a T-shaped piston 19 accommodated in the cylinder 16 is slidably inserted into the connecting hole 18 of the connecting portion 17. It is configured to receive.

When the cutter bit 11 having the above-described lock mechanism 12 is mounted in the cutter holder 8, the lock pin 13 is urged outward by a spring 14 to fit into the pin hole 9 of the cutter holder 8. And cutter bit 11
Is locked in that position, and the hydraulic oil in the hydraulic chamber 15 moves the pinstone 19 in the cylinder 16 to the connecting portion 17 side.

In order to replace the cutter bit 11, the tip of a bit replacement bar, which will be described later, is connected to the connection hole 18 of the connection portion 17.
When inserted into the cylinder, the rod of the piston 19 is pressed and moves in the cylinder 16. As a result, the pressure in the hydraulic chamber 15 rises, and the lock pin 13 is pushed back toward the center portion against the spring 14 to escape from the pin hole 9 to release the lock. As a result, the cutter bit 11 is attached to the cutter holder 8.
In a free state. In the above description, the case where the lock mechanism 12 is provided with the pair of lock pins 13 is shown. However, the number of the lock pins 13 is not limited to one, and may be one or more. Also, instead of the spring 14,
An elastic material such as urethane rubber having a similar function may be used.

Reference numeral 25 denotes a box-like guide having a rectangular cross section and a front and rear opening which is provided in the opening 3a of the bulkhead 3 above the cutter shaft 6, and 26 is slidably disposed in the guide 25. A slide box 30 having substantially the same shape as that of the guide 25 is a drive device that is made of, for example, a fluid pressure jack and slides the slide box 26 back and forth along the guide 25.

A flange 27 having an earth and sand seal 28 is provided at the face side opening of the slide box 26, and a lid 29 inserted from the rear side opening is fixed to this flange 27 by bolts. Closes the opening 3a of the bulkhead 3. As shown in FIG. 4, the slide box 26 is desirably large enough to accommodate all the cutter bits 11 of each cutter holder row. Further, the cross-sectional shapes of the guide 25 and the slide box 26 are not limited to a quadrangle, but may be other shapes such as a circular cross-section and an ellipse as long as they can surround the cutter bit 11 to be replaced.

FIG. 5 shows an example of the driving device 30 for the slide box 26. Reference numeral 31 denotes a reaction force bracket attached to the side wall of the guide 25 by welding, screws, or the like. The reaction force bracket 31 has, for example, a hydraulic jack 32 attached thereto. It is connected to. Reference numeral 34 denotes a control unit of the hydraulic jack 32.

According to the driving device 30 configured as described above, the slide box 26 can be slid along the guide 25 by moving the operating rod 33 forward or backward by the control unit 34. The driving device 3 is shown in the figure.
0 is provided on one side wall of the guide 25,
In order to slide the slide box 26 smoothly, it is desirable to provide the slide box 26 on both side walls of the guide 25. Although the case where the driving device 30 is provided on the side wall of the guide 25 is shown, the driving device 30 may be provided on the top plate or the bottom plate or both the top plate and the bottom plate of the guide 25, and further, instead of the fluid pressure jack, an electric type May be provided.

Reference numeral 41 denotes a kneading blade 42 provided in the excavating chamber 40, and an agitator attached to the bulkhead 3; 43, a mud pipe for discharging the excavated mud to the outside;
Reference numeral 4 denotes a manhole provided in the cut-spoke 7, and 45 denotes a water stop valve.

Next, an example of a procedure for replacing the cutter bit 11 according to the embodiment configured as described above will be described. (1) Rotate the cutter spoke 7 to position the cutter bit 11 to be replaced on the front surface of the slide box 26.

(2) As shown in FIG. 6, the slide box 26 is advanced along the guide 25 by the drive unit 30, and the flange 27 is brought into contact with the inner surface of the cut spoke 7. (3) In this state, as shown in FIG. 7, the lid 29 is removed from the flange 27 of the slide box 26, and the flange 27 is crimped to the cut spoke 7. At this time, since the earth and sand seal 28 is provided on the flange 27, earth and sand do not enter the machine.

(4) Next, as shown in FIGS. 7 and 8,
A water stop valve 45 in a closed state is inserted into the slide box 26, and its tip is aligned with and abutted on the cutter bit 11 to be replaced, and its flange 46 is fixed to the inner surface of the cut spoke 7 with a bolt. The water passage 47 of the water stop valve 45 has an inner diameter substantially equal to or slightly larger than the outer diameter of the cutter bit 11.

(5) Next, as shown in FIG. 9, the bit replacement bar 50 is inserted into the water passage 47 of the water stop valve 45 to the position of the seal member 48, and the water stop valve 45 is opened. Then, the bit replacement bar 50 is pushed into the water passage 47, and its tip is inserted into the connection hole 18 of the connection portion 17 of the cutter bit 11 as shown in FIG.
It rotates and makes the connection part 17 hold. (6) As a result, the piston 19 is pushed into the cylinder 16, so that the pressure in the hydraulic chamber 15 increases, and the lock pin 13 is retracted against the urging force of the spring 14 to be separated from the pin hole 9, unlock.

(7) Then, as shown in FIG. 11, if the bit replacement bar 50 is retracted, the cutter bit 11 moves in the water passage 47 together with the bit replacement bar 50 and is pulled out. The water shutoff valve 45 is closed when the cutter bit 11 passes. When the cutter bit 11 is pulled out from the water stop valve 45, the bit replacement bar 50 is rotated 90 ° in the opposite direction, and is removed from the cutter bit 11.

(8) Next, mounting of the new cutter bit 11 on the cutter holder 8 is performed in a procedure substantially opposite to the above-described procedure for pulling out the cutter bit 11. That is, as shown in FIG. 11, the cutter bit 11 locked at the tip of the bit replacement bar 50 is inserted into the water passage 47 of the water stop valve 45 in the closed state up to the position of the seal member 48, and stopped. The water valve 45 is opened.

(9) Next, as shown in FIG. 10, the bit replacement bar 50 is pushed into the water passage 47 of the water stop valve 45, and the cutter bit 11 is inserted into a predetermined position in the cutter holder 8. Then, the bit replacement bar 50 is rotated 90 ° in the opposite direction to disengage the engagement with the connecting portion 17, and as shown in FIG. 9, the bit replacement bar 50 is pulled out from the water stop valve 45, and at the same time, the water stop valve 45 is closed.

As a result, the pinstone 19 of the lock mechanism 12 moves to the connecting portion 17 side, and the lock pin 13 is urged by the spring 14 to move forward with the decrease of the oil pressure in the hydraulic chamber 15, and the lock holder 8 is moved forward. The cutter bit 11 is fitted into the pin hole 9 to lock the cutter bit 11 at that position.

(10) Next, as shown in FIGS. 8 and 7, the bolt of the flange 46 is removed, and the water stop valve 45 is taken out of the slide box 26. (11) Further, the lid 29 is fixed to the flange 27 of the slide box 26 which is crimped to the cut spoke 7 with a bolt, and the opening is closed. (12) When the slide box 26 is retracted to the position of the bulkhead 3 by the drive device 30, the replacement of the cutter bit 11 is completed.

As is apparent from the above description, according to the present embodiment, cutter bits can be easily converted by a simple structure and a simple procedure. In addition, a lock mechanism is built into the cutter bit, and the lock mechanism is operated by the cutter replacement bar to lock or unlock the cutter bit to the cutter holder, so that the cutter bit can be easily and reliably replaced. It can be carried out.

FIGS. 12 and 13 are schematic views showing another example of the lock mechanism 12 of the cutter bit 11. FIG. In FIG. 12, reference numeral 20 denotes a movable element slidably disposed in the cutter bit 11 and comprising a cylindrical portion and a frustoconical portion following the cylindrical portion.
4a is a spring interposed between the movable element 20 and the inner wall of the cutter bit 11. In the drawing, the spring 14a
Shows a case where no load is applied. For example, the rear side of the movable element 20 (the communication portion 17) is provided on the inner wall of the cutter bit 11.
A stopper may be provided to restrict the movement of the spring 14a, and a slight load may be applied to the spring 14a. Reference numeral 13 denotes a lock pin whose lower end is in contact with the slope of the movable element 20, and is urged by a spring 14b interposed between the movable pin 20 and the inner wall of the cutter bit 11 to be constantly pressed against the slope. 21 is the movable element 2
This is an operating rod provided between the first connector 0 and the connecting portion 17.

In the lock mechanism 12 of the cutter bit 11 as described above, in the state shown in the figure, the lock pin 13 is pushed up on the slope of the movable element 20 and fits into the pin hole 9 of the cutter holder 8 described above. Is locked in that position. As described above, when the bit replacement bar 50 is inserted into the connection hole 18 of the connection portion 17 and connected, the operating rod 2
1 is pressed to move the movable element 20 to the left in the drawing against the spring 14a. As a result, the lock pin 13 descends along the slope of the movable element 20, separates from the pin hole 9 of the cutter holder 8, and the lock is released.

When the cutter bit 11 is installed in the cutter holder 8 and the bit replacement bar 50 is removed from the connecting portion 17, the movable element 20 is urged by the spring 14a to move forward, and the lock pin 13 moves along the slope. The cutter bit 11 is inserted into the pin hole 9 of the cutter holder 8 to lock the cutter bit 11 at that position.

In the cutter bit 11 of FIG. 13, reference numeral 22 denotes a movable member housed in the cutter bit 11, and a spring 14a is interposed between the end of the movable member and the inner wall of the cutter bit 11. Although the figure shows a case where the spring 14a is in a no-load state, for example, a stopper for regulating the movement of the movable member 22 toward the connecting portion 17 is provided on the inner wall of the cutter bit 11, and the spring 14a is slightly May be applied. Reference numeral 23 denotes a lever constituting a link mechanism, one end of which is rotatably fixed to the movable member 22 and the other end of which is rotatably fixed to the lock pin 13. Reference numeral 21 denotes an operating rod provided between the movable member 22 and the connecting portion 17.

In the lock mechanism 12 of the cutter bit 11 as described above, the lock pin 13 is pushed up by the link mechanism in the state shown in FIG.
And is locked at that position of the cutter bit 11. When the bit replacement bar 50 is inserted into the connection hole 18 of the connection portion 17 and connected, the operating rod 21 is pressed to move the movable member 22 to the left in the drawing against the spring 14a. As a result, the lock pin 13 side of the lever 23 descends, and the lock pin 13 separates from the pin hole 8 of the cutter holder 8,
The lock is released.

When the cutter bit 11 is installed in the cutter holder 8 and the bit replacement bar 50 is removed from the connecting portion 17, the movable member 22 is urged by the spring 14a to move forward, whereby the tip of the lever 23 is moved. Ascend to lock pin 13
Is fitted into the pin hole 9 of the cutter holder 8 to lock the cutter bit 11 at that position.

FIG. 14 shows another embodiment of the present invention. In this embodiment, a driving device 30 for a slide box 26 is installed on a main body, and its operation rod is connected to the slide box 2.
6 is connected to the ceiling and floor plate or both side walls so that it can slide back and forth along the guide 25. The operation and effect of this embodiment are the same as those of the above-described exchange device.

[Embodiment 2] As described above, the slide box 26 is desirably large enough to accommodate all the cutter bits 11 of the cutter holder row. Bit 1
In some cases, it is difficult to capture 1. The present embodiment deals with such a case. As shown in FIG. 15, two openings 3a and 3b are provided in the bulkhead 3 above the cutter shaft 6 to provide guides 25a and 3b, respectively.
25b, and slide boxes 26a and 26b are slidably disposed in the guides 25a and 25b.

Slide box 2 in the present embodiment
Since the structures of 6a and 26b, the driving means, the procedure for replacing the cutter bit 11, and the like are almost the same as those in the first embodiment, the description is omitted.

[Embodiment 3] The present embodiment also relates to a cutter bit 11 exchanging device when all the cutter bits 11 in the cutter holder row cannot be taken in by one slide box 26. In FIG. 16, reference numeral 35 denotes a box having a substantially funnel shape, a flange 36 provided on the small-diameter portion side, a skirt portion formed on the large-diameter portion side, and a support portion 37 provided at the tip end.

The box 35 is disposed inside the excavation chamber 40 on the outer periphery of the cutter shaft 6 and has a flange 36.
Is fixed to the inner surface of the Katas Spoke 7 with bolts, etc.
A support 37 is provided in the opening 3 b provided in the bulkhead 3, and is rotatably supported by the bulkhead 3 via a seal member 38. Therefore, since the inside of the box 35 and the inside of the bulkhead 3 are reliably shut off from the excavation chamber 40 by the box 35, mud does not enter.

In the present embodiment configured as described above, the cutter bit 11 on the outer peripheral side of the
Is the slide box 26 as in the first embodiment.
The cutter bit 11 provided on the center side is replaced by using
Is exchanged by using a water stop valve 45 inserted in the box 35 and a cutter exchanging bar 50 inserted into the box 35 in substantially the same procedure as in the first embodiment.

[Fourth Embodiment] FIG. 17 is a longitudinal sectional view of the fourth embodiment. In the figure, 35a is formed in a substantially funnel shape, a flange 36a is provided on the small diameter portion side, and a support portion 37a is formed on the large diameter portion side by a cylindrical skirt portion. Is a box also serving as a cutter shaft to which the external gear 39 is attached.

In the box 35a, a flange 36a is attached to the outer periphery of the central portion of the inner surface of the cut spoke 7 by a bolt or the like, and the support portion 37a is a cylindrical portion protruding from the outer periphery of the central opening of the bulkhead 3 toward the face. On the outer circumference of 3a,
It is rotatably supported via a bearing 38a. 3b is provided between the bulkhead 3 and the cutter box 7,
A front end plate that rotatably supports the box 35 a via the seal member 38, and forms a housing 55 for a gear mechanism between the front end plate and the bulkhead 3. Reference numeral 56 denotes a gear housed in the housing chamber 55 and meshes with the external gear 39 provided in the box 35a. Reference numeral 57 denotes a driving device of the gear 56.

In the present embodiment configured as described above, the external gear 3 is driven by the driving device 57 via the gear 56.
9. By rotating the box 35a, the box 3
The cut-spoke 7 attached to 5a can be rotated. Then, the cutter bit 11 on the outer peripheral side of the cut-spoke 7 is replaced by using the slide box 26 in the same manner as in the first embodiment, and the cutter bit 11 provided on the center portion side is inserted into the box 35a. Using the water valve 45 and the cutter replacement bar 50 inserted therein, replacement is performed in substantially the same procedure as in the first embodiment.

In the above description of the third and fourth embodiments, the case where the boxes 35 and 35a are formed in a substantially funnel shape is shown. However, the boxes 35 and 35a must be circular in the portion supported by the bulkhead 3. However, the other portions can have any suitable shape such as a cylindrical shape, a conical shape, a polygonal conical shape, and the like.

Although the embodiment of the present invention has been described above, the shield machine for embodying the present invention is not limited to the illustrated machine, but can be applied to a shield machine having another structure.

[0051]

According to the present invention, there is provided a method for replacing a cutter bit, comprising the steps of: moving a slide box until it comes into contact with a cut-spoke, removing a cover provided on a front surface, and pressing the slide-box on a cut-spoke; A step of aligning the inserted water stop valve with the cutter bit and fixing it to the cut-spoke; a step of inserting a cutter replacement bar into the water stop valve to connect to the cutter bit and unlocking the cutter bit; A step of pulling out the bit from the water stop valve together with the cutter replacement bar, and a step of connecting a new cutter bit to the cutter replacement bar and attaching the cutter bit to the cut-spoke by a process substantially opposite to the above steps. Therefore, the cutter bit can be replaced very easily and reliably.

Further, in the above-mentioned cutter bit replacing method, the cutter bit is replaced in a substantially funnel-shaped box attached to the cutter spoke around the cutter shaft, or the cutter bit is attached to the cutter spoke. Since the cutter bit is constituted by a funnel-shaped box and the cutter bit is exchanged in the box, the cutter bit attached to a place where the cutter bit cannot be taken into the slide box can be easily exchanged.

The cutter bit exchanging device according to the present invention comprises:
A cutter bit with a built-in lock mechanism and detachably attached to the Kata's spoke, and a detachable lid on the front side, slidably arranged in a guide installed in the opening of the bulkhead, The slide box which is removed by moving the lid and crimped to the Katas spokes, a water stop valve inserted into the slide box and aligned with the cut bit and detachably fixed to the Katas spokes, Since a cutter replacement bar having a connection portion with the cutter bit and being inserted into the water stop valve is provided, the cutter bit can be reliably replaced by a simple structure and operation, and maintenance is easy.

In the above cutter bit exchanging device,
A substantially funnel-shaped box is provided around the cutter shaft, one end of which is fixed to the cut-spoke and the other end is rotatably supported by an opening provided in the bulkhead. Since it consisted of a nearly funnel-shaped box fixed to the spokes and the other end rotatably supported by the opening provided in the bulkhead, the cutter bit provided on the center side of the cut-spoke that could not be taken into the slide box It can be easily and reliably replaced in the box.

Further, in the above cutter bit changing device, the lock mechanism incorporated in the cutter bit is configured so that the lock is automatically released by connecting the cutter replacement bar to the cutter bit. Locking and unlocking of the cutter bit to the cut-spoke can be performed very easily and reliably.

[Brief description of the drawings]

FIG. 1 is a front view of a shield machine according to Embodiment 1 of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an enlarged view of a main part of FIG. 2;

FIG. 4 is an explanatory diagram showing a relationship between a cutter bit and a slide box.

FIG. 5 is a perspective view of an example of a drive device of the slide box.

FIG. 6 is an operation explanatory view of the first embodiment.

FIG. 7 is an operation explanatory diagram of the first embodiment.

FIG. 8 is an operation explanatory view of the first embodiment.

FIG. 9 is an operation explanatory view of the first embodiment.

FIG. 10 is an operation explanatory diagram of the first embodiment.

FIG. 11 is an operation explanatory view of the first embodiment.

FIG. 12 is a schematic view showing another example of a cutter bit locking mechanism.

FIG. 13 is a schematic diagram showing another example of a cutter bit locking mechanism.

FIG. 14 is a longitudinal sectional view of another example of the first embodiment.

FIG. 15 is a longitudinal sectional view of the second embodiment of the present invention.

FIG. 16 is a longitudinal sectional view of Embodiment 3 of the present invention.

FIG. 17 is a longitudinal sectional view of Embodiment 4 of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shield machine 3 Bulkhead 6 Cutter shaft 7 Cutter spoke 8 Cutter holder 11 Cutter bit 12 Lock mechanism 25 Guide 26 Slide box 29 Lid 30 Drive 35 Box 45 Water stop valve 50 Bar for cutter replacement

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Shuichi Hara 1534-1, Yotsuku-cho, Nishinasuno-machi, Nasu-gun, Tochigi Prefecture Goyo Construction Co., Ltd. (72) Inventor Hideaki Okada Nishinasuno-cho, Nasu-gun, Tochigi 1534-1, Yotsucho Goyo Construction Co., Ltd. Technical Research Institute F-term (reference) 2D054 AC01 BA07 BB07

Claims (7)

[Claims] 1. A step of moving a slide box having a detachable lid on the front surface until it comes into contact with the cut-spoke, removing the lid and crimping the slide box to the cut-spoke, and inserting the slide box into the slide box. Aligning the water stop valve with the cutter bit and fixing the water stop valve to the cutter spoke; inserting a cutter replacement bar into the water stop valve and connecting to the cutter bit, and unlocking the cutter bit. Withdrawing the cutter bit together with the cutter replacement bar from the water stop valve, connecting a new cutter bit to the cutter replacement bar,
Attaching the cutter bit to the cutter spoke by a process substantially opposite to the above steps. 2. A method for exchanging cutter bits according to claim 1, wherein the cutter bits are exchanged in a substantially funnel-shaped box attached to the cutter spoke around the cutter shaft. 3. The cutter bit replacement method according to claim 1, wherein the cutter shaft is constituted by a substantially funnel-shaped box attached to the cutter spoke, and the cutter bit is replaced in the box. 4. A cutter bit which has a built-in lock mechanism and is detachably attached to a cut-spoke, and has a detachable lid on a front surface thereof, and is slidable in a guide installed in an opening of a bulkhead. A slide box which is disposed, moves to the cut-spoke side, removes the lid, and is crimped to the cut-spoke; and a slide box which is inserted into the slide box, is aligned with the cutter bit, and is attached to and detached from the cut-spoke. A watertight valve that is fixed so as to be fixed, and a cutter replacement bar that has a connection portion with the cutter bit at a distal end thereof and that is inserted into the watertight valve. apparatus. 5. A substantially funnel-shaped box disposed around a cutter shaft, one end of which is fixed to a cut-spoke and the other end of which is rotatably supported by an opening provided in a bulkhead. The cutter bit exchanging device according to claim 4. 6. The cutter shaft according to claim 4, wherein the cutter shaft is formed as a substantially funnel-shaped box having one end fixed to the cut spoke and the other end rotatably supported by an opening provided in the bulkhead. Cutter bit replacement device. 7. A lock mechanism built in a cutter bit,
7. A cutter bit exchanging device according to claim 4, wherein a lock is released by connecting a cutter exchanging bar to said cutter bit.