JP2001323781A - Cutter bit exchanging mechanism for shield machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bit exchanging mechanism for a shield machine, which carries out inspection and repair of the entire cutter portion, to thereby enable the shield machine to carry out long-distance excavation. SOLUTION: The cutter bit exchanging mechanism for the shield driving machine, carries out exchange of the cutter bit 12 for the shield driving machine 1, or maintenance of a cutter front end inclusive of a cutter spoke 11 and a cutter rotation shaft 8. According to the cutter bit exchanging mechanism, a cutting face partition wall 21 having a slit 19 for passing the cutter front end to a front surface of a bulk head 6 of the shield driving machine 1, is arranged in a manner approaching and separating from the bulkhead 6. Further, the spoke 11 is formed such that its peripheral edge can recede/protrude in a radial direction, and the cutter 7 is arranged in a manner being movable in an axial direction of the shield driving machine 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield bit exchanging mechanism of a shield excavator for exchanging a cutter bit of a shield excavator or performing maintenance of a cut spoke.

[0002]

2. Description of the Related Art In recent years, various mechanisms for exchanging a cutter bit of a shield machine have been developed, for example, one disclosed in Japanese Patent Application Laid-Open No. H8-21188.

This bit exchanging mechanism is applied to a shield machine in which a face plate is formed around a cutter, and only the cutter and the cutter bit are retracted between the face plate and the bulkhead while leaving the cutter face plate at the front. In that space, bit exchange was performed.

A bit exchange mechanism applicable to a shield excavator in which a cutter bit is provided on a cutter spoke extending radially from a cutter rotation axis is disclosed in Japanese Patent Laid-Open No. 3-2.
No. 02593 was disclosed.

[0005] In this bit exchange mechanism, the cutter bit is rotated to turn the cutter bit backward, and the work chamber is slid from the bulkhead side to the cutter bit, where the bit exchange is performed. Was.

[0006]

However, in the above-described bit exchange mechanism, the center of the cutter and the face plate (Japanese Patent Laid-Open No.
In the case of the bit exchange mechanism disclosed in Japanese Patent Application Laid-Open No. 21188), the cutter bit can be inspected and replaced because it remains in the front face portion, but the entire cutter portion including the central portion of the cutter and the face plate is inspected and repaired. There was a problem that long-distance excavation was not possible.

Accordingly, the present invention has been devised to solve the above-mentioned problem, and an object of the present invention is to provide a shield excavator capable of performing inspection and repair of the entire cutter portion and enabling long-distance excavation. A bit exchange mechanism.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the invention according to claim 1 is for replacing a cutter bit of a shield machine or performing maintenance of a cutter front end including a cutter spoke and a cutter rotating shaft. In the cutter bit exchanging mechanism of the shield machine, in the front surface of the bulkhead of the shield machine, a face partition having a slit for passing the cutter front end portion is provided so as to be able to approach and separate from the bulkhead, Is formed so as to be able to protrude and retract in the radial direction, and the cutter is provided so as to be movable in the axial direction of the shield machine.

According to the above construction, by passing the cutter front end through the slit of the face bulkhead, the cutter front end can be positioned in the space between the face bulkhead and the bulkhead. However, work such as cutter bit replacement can be performed from the front of the cutter. Accordingly, not only inspection and replacement of the cutter bit, but also inspection and repair of the entire cutter portion including the center portion of the cutter can be performed, and long-distance excavation can be performed.

According to a second aspect of the present invention, a shield excavating device including the bulkhead, the cutter and a screw conveyor for discharging excavated soil is provided slidably in an axial direction in a shield frame of the shield excavator. When the cutter bit is replaced, a telescopic cylinder is provided that slides the shield excavating device rearward, moves the front end of the cutter through the slit of the face partition, and moves it behind the face partition.

In the invention according to claim 3, the telescopic cylinder slides the shield excavating device forward to allow the front end of the cutter to pass through the slit of the face partition when the excavation is restored after the cutter bit is replaced. The lever is moved forward of the face partition.

[0012] In the invention according to claim 4, the face partition wall has:
At the time of excavation recovery after the end of the cutter bit exchange, there is provided traction means for sliding the face partition rearward to pass the front end of the cutter through the slit of the face bulkhead and positioned in front of the face bulkhead. .

According to a fifth aspect of the present invention, in the shield excavating apparatus, the shield excavating machine has an inner cylinder and an outer cylinder, and has a center-folding jack for folding the inner cylinder and the outer cylinder. The telescopic cylinder to be slid is also used as the middle folding jack.

According to a sixth aspect of the present invention, a shield excavating device including the bulkhead, the cutter and a screw conveyor for discharging excavated soil is provided slidably in an axial direction in a shield frame of the shield excavator. The above-mentioned face bulkhead is slidably provided up to the front end of the hood of the shield machine, and when replacing the cutter bit,
Sliding means for sliding the face partition to the front end of the hood of the shield machine is provided, and the shield machine is slid rearward to allow the cutter front end to pass through the slit of the face bulkhead to form the face partition. The telescopic cylinder is provided for moving backward.

According to a seventh aspect of the present invention, the bulkhead and the cutter are slidably provided in an axial direction in a shield frame of a shield machine, and an opening of a screw conveyor for discharging excavated soil is provided with the face. A telescopic cylinder is provided on the partition wall, and when exchanging the cutter bit, the bulkhead and the cutter are slid rearward, and the cutter front end is passed through the slit of the face partition wall and moved to the rear of the face partition wall. In addition, there is provided an elevating means for elevating the rear of the screw conveyor to prevent interference with the cutter device.

In the invention according to claim 8, the screw conveyor is supported on the face partition wall by a spherical joint,
The rear end is raised.

According to a ninth aspect of the present invention, a closing plate for covering the slit is provided on the slit of the face partition wall so as to be freely opened and closed.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a sectional view showing a first embodiment of a cutter bit exchange mechanism of a shield machine according to the present invention.
FIG. 2 is a front view of FIG.

In the embodiment shown in FIG. 1, a description will be given of an example in which such a cutter bit exchanging mechanism is applied to a center-bent shield excavator.

First, the overall configuration of the shield machine will be described with reference to FIG.

The shield machine 1 includes a shield frame 2
The inner cylinder 3 and the outer cylinder 4 which constitute the above. The outer cylinder 4 is disposed in front of the inner cylinder 3 and is slidably connected to the inner cylinder 3. Between the inner cylinder 3 and the outer cylinder 4, a center bending jack 5 extending in the axial direction is bridged at a predetermined pitch, and at the time of curve construction, the outer cylinder 4 is slid with respect to the inner cylinder 3 as appropriate. The shield frame 2 is bent.

In the vicinity of the inner front end of the outer cylinder 4, there is provided a bulkhead 6 for partitioning the inside of the shield machine 1 from the outside.

The bulkhead 6 is provided with a cutter device 7. The cutter device 7 includes a cutter rotating shaft 8 that penetrates the center of the bulkhead 6, a drive motor 9 that rotates the cutter rotating shaft 8, and a cutter shaft 7 extending radially from the front end of the cutter rotating shaft 8 at an equal angular pitch. It has a plurality (three in the present embodiment) of cutout spokes 11 arranged. On the front surface of the cutter spoke 11, a plurality of cutter bits 12 for excavating a face are provided.

At the front end of the cutter rotating shaft 8, there is provided an additive inlet 14 for injecting an additive necessary for excavation into the face.

At the lower part of the bulkhead 6, a screw conveyor 16 for carrying the excavated earth and sand to the rear of the tunnel 15 is provided.
Is provided.

An erector 18 for assembling the segment 17 is provided on the inner rear side of the shield frame 2.

Incidentally, in the present invention, the outer peripheral end of the cut spoke 11 is formed so as to be able to protrude and retract in the radial direction. Further, a cutter device 7 is provided movably in the axial direction of the shield machine 1.

Specifically, a part (in this embodiment, 2
The book's cut-spoke 11 has a fixed portion 23 on the center side thereof.
Is formed such that the outer peripheral end thereof is located inside the outer cylinder 4 when viewed from the front, and a moving part 24 that protrudes and retracts in the radial direction is provided at the outer peripheral end of the fixed part 23. The outermost cutter bit 12a is provided on the front surface of the moving portion 24.

The moving part 24 of the cut spoke 11 moves in and out in the radial direction by the expansion and contraction of a telescopic cylinder (not shown) provided in the fixed part 23 along the radial direction.

The other cut-spoke pork (shown on the lower side in the figure) 11 has an outer peripheral end whose outer end is viewed from the front.
It is formed so that it may become inside. This cutter spoke 11 is provided with a copy cutter 25. When a sharp curve is constructed, the cutter cylinder 26 is provided with a telescopic cylinder 26 provided radially inside the cutter spoke 11 so as to protrude outward in the radial direction to reduce excess digging. It is supposed to do.

The bulkhead 6 is provided slidably with respect to the outer cylinder 4 in the longitudinal direction of the shield machine 1. At the rear, one end of the center-folding jack 5 is fixed.

The expansion and contraction of the middle folding jack 5 causes the bulkhead 6 to slide in the axial direction of the shield excavator 1, and the shield excavator 22 such as the cutter device 7 and the screw conveyor 16 provided on the bulkhead 6 to move. As a result, the face partition 21 described later is provided so as to be relatively close to and separated from the bulkhead 6.

That is, the center bending jack 5 functions as a telescopic cylinder for sliding the shield excavating device 22.

A cutter device 7 is provided on the front surface of the bulkhead 6.
19 for passing through the front end of the plate (see FIG. 2)
Is provided.

As shown in FIG. 2, the face partition 21 is formed in a disk shape and fixed inside the outer cylinder 4. The slit 19 is formed such that a portion where the cutter rotating shaft 8 and the cut-spoke 11 are located is open when viewed from the front (in the present embodiment, in a substantially Y-shape).

Inside the face partition 21, a closing plate 27 for covering the above-mentioned slit 19 is provided so as to be freely opened and closed. The closing plate 27 is divided at the center in the width direction of the slit 19 with the axis of the face partition 21 as a center.
V-shaped inner obturator 28 along the edge of 9
And an outer closing plate 29 that covers the outer side of the inner closing plate 28 in the radial direction.

The inner closing plate 28 is provided so as to be slidable in the radial direction, and is moved by an open / close telescopic cylinder 31 arranged along the radial direction.

The outer closing plate 29 is provided so as to be slidable in the circumferential direction on the inner side of the periphery of the face partition 21 and is moved by an opening / closing telescopic cylinder 32 arranged along the circumferential direction to form the inner closing plate. The opening 28 on the outside in the radial direction that occurs when the slider 28 slides to the center side is closed.

The inner closing plate 28 and the outer closing plate 29 are arranged offset from each other in the thickness direction (the front-back direction of the shield machine 1), and can be wrapped when the slit 19 is opened. .

A hydraulic hose insertion tube 38 for accommodating a hydraulic hose 37 connected to the opening and closing telescopic cylinders 31 and 32 is provided on the rear surface of the face partition 21.

As shown in FIG. 4, the hydraulic hose insertion tube 38 is slidably supported in the axial direction by a ring-shaped seal member 40 provided in a through hole 39 of the bulkhead 6.

Since the face 33 and the space 33 for bit replacement can be mechanically shut off entirely by the provision of the closing plate 27, it is provided when excavated earth and sand is relatively soft and water flows out. If the excavated soil is relatively hard and has no water, the closing plate 27 may not be provided.

Next, the operation of the cutter bit exchanging mechanism of the shield excavator having the above configuration will be described while explaining the operation of the shield excavator at the time of exchanging the cutter bit.

First, the steps in the case where the excavated soil is relatively hard will be described with reference to FIG.

When replacing the cutter bit 12 or performing maintenance on the cutter front end including the cutter spoke 11 and the cutter rotating shaft 8, first, the moving portion 24 of the cutter spoke 11 is moved inward in the radial direction, and the outer cylinder is moved. 4 and the cutter rotating shaft 8 is rotated so that the position of the cut-spoke 11 matches the position of the slit 19 of the face partition 21.

Then, the center bending jack 5 which is a telescopic cylinder is retracted, and the cutter device 7 is moved together with the bulkhead 6.
Excavating device 22 including screw and screw conveyor 16
Is slid backward inside the outer cylinder 4.

As a result, the cutter front end composed of the cutter spoke 11 and the cutter rotating shaft 8 passes through the slit 19 of the face partition 21 and moves to the rear of the face partition 21.

Then, an operator enters a space 33 with the cutter device 7 behind the face partition 21 from a manhole (not shown) provided in the bulkhead 6 and
Replacement of 2 or cutter spoke 11 and cutter rotating shaft 8
Maintenance of the cutter front end including

At this time, the worker can work from the front of the cutter device 7 without the earth and sand behind the face partition 21 which is cut off from the face at a section other than the slit 19 of the face partition 21. Therefore, the cutter bit 12 can be easily and reliably replaced, and work on the front surface of the cutter rotating shaft 8 and the cutter spoke 11 becomes possible.
Inspection and repair of the entire cutter can be performed. Therefore, long-distance excavation of the shield machine 1 becomes possible.

FIGS. 6 and 7 are cross-sectional views showing the operation of the shield machine 1 at the time of excavation recovery after the cutter bit 12 has been replaced.

In FIG. 6, the middle bending jack 5 which has been retracted when the cutter bit 12 is replaced is extended, and together with the bulkhead 6, the cutter device 7 and the screw conveyor 16 are extended.
Is slid forward inside the outer cylinder 4.

Thus, the front end of the cutter device 7
After passing through the slit 19 of the face partition 21, it moves forward and returns to the excavation state again. At this time, Katas Spoke 1
The first moving unit 24 is projected outward in the radial direction.

In this case, since the rear end of the outer cylinder 4 is located at the front end of the inner cylinder 3, the shield frame 2 can be bent immediately after resuming the excavation, and a sharp curve can be formed. .

On the other hand, in FIG. 7, the hydraulic pipe insertion pipe 37 provided in the face partition 21 is provided with a traction means 34 for drawing the face partition 21 and the outer cylinder 4 rearward.
Without changing the position of the cutter device 7, the cutting partition 21 is moved backward by the traction means 34 so that the front end of the cutter device 7 is
It relatively passes through the slit 19 of the face bulkhead 21, moves forward, and returns to the excavation state again. At this time, the moving part 24 of the cut spoke 11 is made to protrude radially outward.

It should be noted that even when the excavated soil is relatively hard, a filler may be injected into the face.

In this case, the filler is injected from the additive inlet 14 into the face portion, and while maintaining the pressure of the filled filler at a constant level, the face is held, and the middle folding jack 5 which is a telescopic cylinder is retracted. Then, the shield excavating device 22 including the cutter device 7 and the screw conveyor 16 together with the bulkhead 6 is slid rearward inside the outer cylinder 4.

After the sliding of the shield excavating device 22 is completed, the work space 3 is moved from a manhole (not shown) provided in the screw conveyor 16 and the bulkhead 6.
After discharging the filler in the work space 3, the worker replaces the cutter bit 12 or cuts the cut spoke 11 in the work space 33.
And maintenance of the cutter front end including the cutter rotating shaft 8.

The excavation restoration work is performed in the same process as the excavation restoration work when the excavated earth and soil described later is relatively soft.

Next, steps in the case where the excavated earth and sand are relatively soft will be described with reference to FIGS.

In this case, first, as shown in FIG. 8, the moving portion 24 of the cut-spoke 11 is moved radially inward to be disposed inside the outer cylinder 4 and the additive injection port 1 is moved.
4 and the filler 35 is injected. The filler 35 is made of a relatively soft material in the form of a gel in consideration of recovery from the excavation. By rotating the cutter rotating shaft 8, the position of the cut spoke 11 is matched with the position of the slit 19 of the face partition 21.

Then, the center bending jack 5 which is a telescopic cylinder is retracted, and the cutter device 7 is moved together with the bulkhead 6.
Excavating device 22 including screw and screw conveyor 16
Is slid backward inside the outer cylinder 4.

As a result, the front end of the cutter including the cutter spoke 11 and the cutter rotating shaft 8 passes through the slit 19 of the face partition 21 and moves to the rear of the face partition 21.

Then, the closing plate 27 of the face partition 21 is moved to close the slit 19 (see FIG. 3). Thereby, the working space 33 behind the face partition 21 is provided.
In addition, intrusion of earth and sand and water from the face 36 can be prevented.

When the shield excavating device 22 is slid, the filler 35 flows into the rear of the face partition 21 as well.
After the slit 19 is closed, the worker who has entered the work space 33 from the manhole scrapes the screw into the screw conveyor 16 and exchanges the cutter bit 12 or cuts the spokes 1.
The maintenance of the cutter front end including the cutter shaft 1 and the cutter rotating shaft 8 is performed.

At the time of excavation restoration, as shown in FIG. 9, the filler 35 is injected in advance into the working space 33 so that the earth and sand water of the face flows from the slit 19 of the face partition 21 and the face does not collapse. And fill it so that there are no voids. Then, each closing plate 27 is moved so that
6 or 7 described above after opening the slit 19 of FIG.
The same steps as described above are performed. At this time, the filler 35 corresponding to the moving amount of the shield machine 22 is discharged from the screw conveyor 16 while maintaining the face while keeping the pressure of the filler 35 constant.

Since the filler 35 is a relatively soft material in the form of a gel, it can be easily discharged by the screw conveyor 16 and the cutter spoke 11 and the cutter rotating shaft 8 can be slid forward without fail. .

FIG. 10 is a sectional view showing a second embodiment of the cutter bit exchanging mechanism of the shield machine according to the present invention, and a sectional view showing the operation thereof.

The shield machine 41 of the second embodiment
The face partition 21 of the shield machine 1 of FIG. 1 is fixed to the outer cylinder 4, while the face partition 21 is moved in the axial direction in the outer cylinder 4 forming a part of the shield frame 2. Are provided so as to be freely slidable.

A telescopic cylinder 43 extending in the axial direction, penetrating the bulkhead 6 and connected to the inner cylinder 3 is provided on the rear surface of the face partition 21. Telescopic cylinder 43
Is slidably supported in a through hole 44 of the bulkhead 6 via a seal member (not shown). When the telescopic cylinder 43 is extended, the face partition 21 is
However, it slides to the front end of the outer cylinder 4.

The other components are the same as those shown in FIG.

Next, the operation of the cutter bit exchanging mechanism of the shield excavator having the above-described configuration will be described while describing the operation of the shield excavator at the time of exchanging the cutter bit according to the present embodiment.

As shown in FIG. 10 (b), first, the moving portion 24 of the cut-spoke 11 is moved inward in the radial direction.
In addition to being arranged inside the outer cylinder 4,
Is adjusted to the position of the slit 19 of the face partition 21, and the face partition 21 is slid to the front end of the outer cylinder 4.

Then, as shown in FIG. 10C, the center bending jack 5 which is an extendable cylinder is retracted, and the shield excavating device 22 including the cutter device 7 and the screw conveyor 16 together with the bulkhead 6 is moved to the outer cylinder. Slide back inside 4.

As a result, the front end of the cutter comprising the cutter spoke 11 and the cutter rotating shaft 8 passes through the slit 19 of the face partition 21 and moves to the rear of the face partition 21.

Then, an operator enters the space 33 with the cutter device 7 behind the face partition 21 from a manhole (not shown) provided in the bulkhead 6 and
Replacement of 2 or cutter spoke 11 and cutter rotating shaft 8
Maintenance of the cutter front end including

In this embodiment, similarly to the shield machine 1 shown in FIG. 1, the cutter bit 12 can be easily and reliably replaced, and the work on the front surface of the cutter rotating shaft 8 and the cutter spoke 11 can be performed. And the following operation and effect can be obtained in addition to the operation and effect that the entire cutter portion can be inspected and repaired.

By moving the face partition 21 forward, the retreat distance of the shield excavating device 22 can be shortened. Accordingly, the length of the shield machine 41 can be shortened, and the turning radius of the curve construction can be further shortened.

FIG. 11 is a sectional view showing a third embodiment of the cutter bit exchanging mechanism of the shield machine according to the present invention, and a sectional view showing the operation thereof.

The shield machine 51 according to the third embodiment
The shield excavator 1 of FIG. 1 slides the cutter device 7 backward inside the outer cylinder 4 on the entire shield excavation device 22 including the screw conveyor 16 and the like, while the screw conveyor 16 is The screw conveyor 16 is not slid, but only the cutter device 7 and the bulkhead 6 are slid rearward.

In order to prevent the screw conveyor 16 from interfering with the cutter device 7 that slides rearward, the screw conveyer 16 passes through a spherical joint 52 that is an elevating means for elevating the rear side.
It is supported by the bulkhead 6.

As shown in FIG. 12, the spherical joint 52 is attached to a bracket 54 provided in an opening 53 at the lower end of the face partition 21. Spherical joint 52
Is composed of a concave support portion 55 on the bracket 54 side and a convex support portion 56 on the screw conveyor 16 side.
A seal member 57 is provided on the support surface of the concave support portion 55.

Since the opening 53 of the screw conveyor 16 is formed at the lower end of the face partition 21, the slit 19 is formed.
Has an opening 5 compared to the shield machine 1 of FIG.
It is formed in a rotated position avoiding 3.

The other components are the same as those of the shield machine 1 shown in FIG.

Next, the operation of the cutter bit exchanging mechanism of the shield excavator having the above-described configuration will be described while describing the operation of the shield excavator at the time of exchanging the cutter bit according to the present embodiment.

As shown in FIG. 11 (b), first, the moving portion 24 of the cut-spoke 11 is moved inward in the radial direction.
It is arranged inside the outer cylinder 4.

Then, the center bending jack 5 which is a telescopic cylinder is retracted, and the cutter device 7 is moved together with the bulkhead 6.
Is slid backward inside the outer cylinder 4.

At this time, since the screw conveyor 16 is supported by the spherical joint 52, the screw conveyor 16 can be lowered rearward to prevent interference with the cutter device 7.

As a result, the front end of the cutter comprising the cutter spoke 11 and the cutter rotating shaft 8 passes through the slit 19 of the face partition 21 and moves to the rear of the face partition 21.

Then, an operator enters the space 33 with the cutter device 7 behind the face partition 21 from a manhole (not shown) provided in the bulkhead 6, and
Replacement of 2 or cutter spoke 11 and cutter rotating shaft 8
Maintenance of the cutter front end including

In the present embodiment, similarly to the shield machine 1 shown in FIG. 1, the cutter bit 12 can be easily and reliably replaced, and the work on the front surface of the cutter rotating shaft 8 and the cutter spoke 11 can be performed. And the following operation and effect can be obtained in addition to the operation and effect that the entire cutter portion can be inspected and repaired.

The screw conveyor 16 is moved to the bulkhead 6
By providing the face partition 21 located further forward, the efficiency of discharging excavated earth and sand can be improved. Also, by sliding only the cutter device 7 and the bulkhead 6 rearward without sliding the screw conveyor 16, the sliding of the cutter device 7 can be performed with a smaller stress as compared with the shield machine shown in FIG. And the structure can be simplified since there are few slide parts.

[0093]

In summary, according to the present invention, not only the replacement of the cutter bit, but also the inspection and repair of the entire cutter portion can be performed, and the excellent effect that long-distance excavation by the shield excavator becomes possible. Demonstrate.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of a cutter bit exchange mechanism of a shield machine according to the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is a front view showing a face partition wall in a state where a slit is closed.

FIG. 4 is a sectional view showing a hydraulic hose insertion tube.

FIG. 5 is a sectional view showing the operation of the shield machine when the cutter bit is replaced.

FIG. 6 is a cross-sectional view showing the operation of the shield machine at the time of recovery from the excavation.

FIG. 7 is a sectional view showing the operation of the shield machine at the time of excavation recovery.

FIG. 8 is a cross-sectional view showing the operation of the shield machine when replacing the cutter bit when closing the slit.

FIG. 9 is a sectional view showing the operation of the shield machine when the cutter bit is replaced when the slit is closed.

FIG. 10 is a sectional view showing a second embodiment of a cutter bit exchanging mechanism of a shield machine according to the present invention, and a sectional view showing its operation.

FIG. 11 is a sectional view showing a third embodiment of a cutter bit exchanging mechanism of a shield machine according to the present invention, and a sectional view showing an operation thereof.

FIG. 12 is an enlarged sectional view showing a spherical joint.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shield excavator 2 Shield frame 3 Inner cylinder 4 Outer cylinder 5 Center bending jack (telescopic cylinder) 6 Bulkhead 7 Cutter device 8 Cutter rotation shaft 11 Cutter spokes 12 Cutter bit 16 Screw conveyor 19 Slit 21 Face partition wall 22 Shield excavation device 27 Obstruction plate 41 Shield excavator 51 Shield excavator 52 Spherical joint (elevation means)

Claims (9)

[Claims] 1. A cutter bit exchanging mechanism for a shield excavator for exchanging a cutter bit of a shield excavator or for maintaining a front end of a cutter including a cutter spoke and a cutter rotating shaft. A face partition having a slit for passing the front end of the cutter is provided so as to be able to approach and separate from the bulkhead, an outer peripheral end of the cutter spoke is formed so as to be able to protrude and retract in a radial direction thereof, and the cutter is a shield excavator. A cutter bit exchanging mechanism for a shield excavator, wherein the cutter bit exchanging mechanism is provided so as to be movable in the axial direction of the cutter. 2. A shield excavating device including the bulkhead, the cutter and a screw conveyor for discharging excavated soil is provided slidably in an axial direction in a shield frame of the shield excavator. 2. A cutter bit exchange for a shield machine according to claim 1, further comprising a telescopic cylinder which slides a shield excavating device rearward to move the front end of the cutter through a slit of the face bulkhead and move it behind the face bulkhead. mechanism. 3. The telescopic cylinder slides the shield excavating device forward at the time of excavation recovery after the cutter bit replacement is completed, so that the front end of the cutter passes through the slit of the face bulkhead and the front of the face bulkhead. 3. The cutter bit exchanging device for a shield machine according to claim 2, wherein the cutter bit is moved. 4. When the excavation is restored after the cutter bit is exchanged, the cutting bulkhead is slid rearward so that the front end of the cutter passes through the slit of the cutting bulkhead and is positioned in front of the cutting bulkhead. 3. The cutter bit exchanging device for a shield machine according to claim 2, further comprising a traction means for positioning. 5. The shield excavator has an inner cylinder and an outer cylinder, and has a center-folding jack for bending the inner cylinder and the outer cylinder in a middle direction. The cutter bit exchanging mechanism for a shield machine according to any one of claims 2 to 4, wherein the cutter bit is also used for the middle folding jack. 6. A shield excavation device including the bulkhead, the cutter and a screw conveyor for discharging excavated soil is provided slidably in an axial direction in a shield frame of the shield excavator, and the face partition wall is provided with:
Sliding means is provided to be slidable to the front end of the hood of the shield excavator, and when the cutter bit is replaced, slide means for sliding the face partition to the front end of the hood of the shield excavator is provided, and the shield excavating device is slid backward. 2. A cutter bit exchanging mechanism for a shield machine according to claim 1, further comprising a telescopic cylinder for moving the front end of the cutter through the slit of the face partition and moving the cutter rearward of the face partition. 7. The bulkhead and the cutter are slidably provided in an axial direction within a shield frame of a shield machine, and an opening of a screw conveyor for discharging excavated soil is provided in the face partition wall. At the time of bit replacement, the bulkhead and the cutter are slid rearward, and a telescopic cylinder is provided for moving the cutter front end through the slit of the face bulkhead and moving behind the face bulkhead. 2. A cutter bit exchanging mechanism for a shield machine according to claim 1, further comprising an elevating means for elevating and preventing interference with the cutter device. 8. The cutter bit exchanging device for a shield machine according to claim 7, wherein the screw conveyor is supported on the face partition wall by a spherical joint, and a rear end thereof is raised. 9. The slit of the face partition wall, wherein a closing plate for covering the slit is provided so as to be openable and closable.
A cutter bit exchanging device for a shield machine according to any one of the above.