JP2002266592A - Shield machine and method for exchanging cutter bits of shield machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for exchanging cutter bits of a shield machine, which can safely exchange a wide range of cutter bits with efficiency. SOLUTION: A shield main body 1 of the shield machine includes a cutter withdrawing mechanism 11 for withdrawing a cutter head 4 having cutter spokes 7A, 7B into a pressure chamber 2 along a shield axial center O. A pressure bulkhead 3 in the shield main body has an operation partitioning body 20 which houses therein the expandable spoke 7B, and allows therein exchange of the cutter bits 8. Further, the operation partitioning body 20 has a front aperture 23 formed in front thereof, and front shutters 26 arranged therein. The front aperture 23 allows insertion of the expandable spoke 7B thereinto. The front shutters 26 can open/close the front aperture 23 before or after housing of the expandable spoke 7B. Further, the front shutters 26 are each provided with a front gate 31 of an arched cross section, which is rotatable about an axial center in a radial direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield excavator capable of exchanging worn cutter bits during excavation and a cutter bit exchanging method for the shield excavator.

[0002]

2. Description of the Related Art In a conventional shield machine, an excavating cutter head is rotatably arranged at a front portion of a shield body.
Some cutter spokes provided in the cutter head in the radial direction are provided with a number of cutter bits for excavating the ground. This cutter bit wears as the excavation work progresses, and particularly, the cutter bit on the outer peripheral side is severely worn, so that cutting may not be possible during the excavation. In this case, the ground in front of the cutter head is frozen and solidified to remove earth and sand, and an operator has to enter the front of the cutter head to perform a replacement operation.

[0003] Since this replacement operation involves danger, it is described in Japanese Patent No. 273892 as a method for safely performing the replacement operation.
No. 7 has been proposed. In this conventional example, the exchange chamber is mounted on the back of the outer peripheral part of the cutter head, and the cutter frame on the front of the exchange chamber is made to be retractable to the rear, so that a worker can slide in and out of the exchange chamber from the partition wall side. It is installed freely, and at the time of replacement, an operator enters the replacement room from the slide gate and replaces the cutter bit of the cutter frame that has been tilted backward.

[0004]

However, in the above-mentioned conventional structure, since the exchange chamber is provided on the back of the cutter head, there is a possibility that the flow of the sediment taken in may be reduced. For this reason, there is a problem in that the exchange chamber is formed in a narrow space and the workability is poor, and the cutter frame that can be collapsed is limited to a small one.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and to provide a shield excavator capable of safely and efficiently replacing a wide range of cutter bits and a method of exchanging cutter bits in the shield excavator.

[0006]

According to a first aspect of the present invention, there is provided a pressure chamber formed by a partition at a front portion of a shield main body, and a rotatably disposed front portion of the pressure chamber. The cutter excavator comprising the cutter head and a plurality of cutter spokes which are provided on the cutter head in a radial direction so as to protrude from a central member and to which a large number of cutter bits are attached. A work compartment where the cutter bit can be replaced is installed, and an opening for inserting a cut-spoke, and an opening before and after accommodating the cut-spoke are opened and closed at the front of the work compartment. A cutter capable of accommodating the cutter spoke in the working compartment by allowing the cutter head to retreat into the pressure chamber along the shield axial direction in the shield body. The withdrawal mechanism and work station body so as to protrude along the shield axial direction is provided with a least one of which can accommodate partition body projecting mechanism cutter spokes work station body.

In the above construction, when the cutter bit is worn out during excavation, the intended cut-spoke and the work compartment are opposed to each other back and forth, and the opening of the work compartment is opened by the opening / closing device. The cutter head is moved backward by the retreat mechanism, or the work compartment is moved forward by the compartment projecting mechanism, and the cut spokes are stored in the work compartment through the opening. Then, after the opening is closed by the opening / closing device, the worker enters the work compartment and replaces and performs maintenance and inspection of the cutter bit of the cut spoke.

Therefore, the inspection and replacement work can be performed safely in the work compartment separated from the pressure chamber to which the face holding pressure is applied, and the work compartment installed on the partition has little effect on the flow of excavated soil. Because it can be formed large,
A wide range of cutter bits of the cutter spokes housed in the working compartment can be replaced and serviced at once.

According to a second aspect of the present invention, in the configuration of the first aspect, the opening is formed by a front opening formed on the front surface of the work compartment and an end opening formed on the shield axis side. The front gate is divided into two parts, left and right, moved to the left and right sides, and the front opening can be opened and closed.
A turning plate is provided on the end face opening side of the left and right front gates, and a cutout portion is formed which is fitted to the cut spokes housed in the turning plate.

[0010] According to the above construction, since the cutout portion which is fitted to the cut-spoke is formed in the rotary plate portion of the front gate, the front gate is closed after the cut-spoke is accommodated in the work compartment. At the same time as the opening is closed, the remaining end opening where the Katas spokes are fitted can be closed, and the work compartment containing the Katas spokes and the pressure chamber can be shut off to prevent infiltration of earth and sand or muddy water. , Can be safely replaced and inspected.

According to a third aspect of the present invention, in the configuration of the second aspect, a slide gate is provided which is capable of opening and closing an end face opening by moving back and forth in a shield axial direction, and a closing position of the end face opening of the slide gate. And a rotation locking portion for holding the front gate in a closed state.

According to the above configuration, the opening and closing of the front gate can be restricted by the rotation locking portion, and the front gate can be prevented from being opened due to erroneous operation or friction with earth and sand. According to a fourth aspect of the present invention, in the configuration according to the first aspect, the opening is configured by a front opening formed on the front surface of the work compartment and an end opening formed on the shield axis side. The front gate is constituted by a single arc-shaped gate plate which can be opened and closed by rotating around a radial axis, and a cut-spoke is accommodated in the end face opening side of the gate plate. And a rotary closing part capable of closing the front part of the end face opening.

According to the above construction, the gate plate having the arc-shaped cross section can cope with the collapse pressure of the high-pressure face. In addition, the rotation end closing portion provided on the gate plate can close the remaining end face opening where the Katas spoke is fitted, and the inside of the working compartment containing the Katas spoke and the pressure chamber holding the face collapse earth pressure. To prevent intrusion of earth and sand or muddy water, and perform safe replacement and inspection work.

According to a fifth aspect of the present invention, in the configuration according to any one of the first to fourth aspects, the Kata's spoke to be replaced with a cutter bit is made extendable and retractable, and the Kata's spoke including the outer end is accommodated in the work compartment. It is configured to be possible.

According to the above configuration, by making the cut spokes extendable, the outermost cutter bit, which is the most worn, can be easily replaced. Claim 6
The method of exchanging a cutter bit in the shield machine described above is a shield machine in which a cutter head having a plurality of radially protruding cutter spokes is rotatably arranged at the front of the shield body, and is provided on the cutter spoke. When replacing the cutter bit, at least one of the working section installed on the partition wall at the front of the shield body and the cutter head is moved in the shield axis direction, and the cutter spoke is accommodated in the working section, and the cutter is inserted. The bit is replaced.

According to the above construction, at the time of replacing the cutter bit, at least one of the working section and the cutter head is moved in the axial direction of the shield to accommodate the cutter spoke in the working section and perform the replacing operation. Therefore, a safe and wide range of cutter bits can be replaced at a time, and the replacement work can be performed efficiently in a short time.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Here, a first embodiment of a shield machine according to the present invention will be described with reference to FIGS.

As shown in FIGS. 1 to 3, a pressure chamber 2 for holding a face collapse earth pressure is provided at a front portion of a cylindrical shield body 1.
And a pressure partition (partition) 3 that forms
A cutter head 4 that is rotatable around a shield axis O is disposed at the front of the shield body 1. The cutter head 4 is rotatably supported by a bearing cylinder 5 arranged at the axial center of the pressure bulkhead 3 via a turning shaft 6, and extends in a radial direction from the center member 4 a at a constant angle to form a large number of cutter bits. Plural (six in the figure) Katas pork 7A, 7B having 8
Is provided.

Of these cut-spokes 7A and 7B,
For example, half of each of them is formed in a fixed spoke 7A having a short length that can be accommodated in the pressure chamber 2, and the rest is between an extended position reaching the outer peripheral position of the shield body 1 and a contracted position that can be accommodated in the pressure chamber 2. The spokes 7B are configured to extend and contract between the spokes 7B. The telescopic spoke 7B is provided with a shaft 7
A fixed cylinder 7b is fixed to the shaft center side of a through a neck part 7d, and a movable cylinder 7c is slidably arranged in the radial direction on the outer peripheral side of the shaft part 7a, and includes an internal hydraulic jack and the like. The movable cylinder 7c is slid by the cutter expansion / contraction drive device (not shown), and the expansion / contraction spokes 7B are expanded / contracted between the extension position and the contraction position. A number of cutter bits 8 are attached to the front and left and right side surfaces of the fixed cylinder 7b and the movable cylinder 7c, respectively.

A cutter retreat mechanism 11 and a cutter driving device 12 are provided in the atmosphere chamber 9 behind the pressure partition 3, and a work compartment 20 is provided on the pressure partition 3. The cutter driving device 12 includes a ring gear 13 provided at the rear of the turning shaft 6 on the atmosphere chamber 9 side, and a plurality of driving motors 15 having a driving pinion 14 meshing with the ring gear 13. Further, the cutter retreat mechanism 11 is mounted on the pressure bulkhead 3 to support the bearing cylinder 5 movably in the shield axis O direction, and a support frame 16 for holding the drive motor 15 in the shield axis O direction. , And a plurality of cutter retreat driving devices (eg, hydraulic jacks) 18 connected between the pressure partition 3 and the support frame 16, and the entire cutter head 4 is placed in the pressure chamber 2. Can be retracted.

As shown in FIGS. 4 to 8, the working compartment 20 has a compartment main body 21 protruding toward the pressure chamber 2 at a compartment compartment notch 22 formed above the pressure bulkhead 3. As shown in FIG. The partition body 21 is formed in a box shape having left and right side walls 21a, 21b, a bottom plate 21c, and a top plate 21d, and has a front opening 23 and a rear entrance 25 formed therein. Further, an end opening 24 is formed in the bottom plate 21c of the partition body 21 so as to be continuous with the front opening 23, and the retractable spokes 7B in a shortened state are inserted from the front opening 23 into the end opening 24 to be expanded and contracted. The neck 7d of the spoke 7B is positioned at the end opening 24.
Is fitted to. A front opening / closing device (opening / closing device) 26 is installed in the front opening 23, and an end face opening / closing device (opening / closing device) 27 is provided in the end opening 24. Further, the rear entrance 25 is formed so as to allow an operator to enter and exit by communicating with the atmosphere chamber 9 and is provided with a rear hatch 28 that can be opened and closed. Although not shown, a muddy water discharger for discharging muddy water that has entered the partition body 21 is also provided.

The front opening / closing device 26 is divided into two parts, left and right, a pair of left and right front gates 31 which can be moved to the left and right sides along the bending direction and can be opened and closed, and a front opening / closing driving device 32 for opening and closing these front gates 31. It is composed of These front gates 31 include a pair of left and right front plates 31a having an arc-shaped cross section along the rotation direction that covers the front opening 23, and a fan-shaped plate (rotating plate portion) attached to the upper side and the lower side of the front plate 31a. ) 31b, and the ends of both fan-shaped plates 31b are rotatably supported via support pins 31c. The front opening / closing drive device 32 is formed of, for example, a hydraulic cylinder, and is connected between the partition body 21 and the sector plate 31b to expand and contract, thereby opening and closing the front plate 31a about the support pin 31c along the main station direction. Can be done. Further, on the inner surfaces of the left and right fan-shaped plates 31b corresponding to the end openings 24, neck notches (notches) 33 that can be externally fitted to the neck 7d of the telescopic spokes 7B are formed at opposing positions. .

The end face opening / closing device 27 is a slide plate (slide gate) that is slidably arranged in the direction of the shield axis O along the inner surface of the sector plate 31b on the bottom side.
34, and an end surface opening / closing drive device 35 that slides the slide plate 34. The slide plate 34 is formed in a flat plate shape so as to cover the end opening 24 and the notch 33 for the neck.
Is composed of a hydraulic cylinder or an electric jack.

Further, as shown in FIG.
Is provided at the closed position, and the opening engagement portion 36 is provided with an engagement rail 36a protruding from the inner surface of the sector plate 31b and an outer engagement surface of the slide plate 34, respectively. The front gate 31 can be opened and stopped while the slide plate 34 closes the notch 33 for the neck.

The back hatch 28 is attached to the partition body 21 via a hinge so as to be openable and closable, and is closed by a known fixing tool such as a fixing bolt. In the above configuration, when the cutter bit 8 is worn by the shield machine during the excavation of the tunnel and the excavation speed is reduced, the excavation is stopped first, and when the excavated soil is solid, the pressure chamber 2 is formed by the excavator.
Remove a certain amount of earth and sand. In the case of muddy water, the target telescopic spokes 7B
Is stopped, and the retractable jacks 18 of the cutter retracting mechanism 11 are driven to retract the cutter head 4 into the pressure chamber 2 after all the retractable spokes 7B are contracted. At the same time, after the slide plate 34 is retracted by the end face opening / closing device 27 to release the front gate 31 from being opened by the opening / locking portion 36, the front gate 31 is opened by the front opening / closing device 26,
A desired telescopic spoke 7B is inserted into the work compartment 20 through the front opening 23 and the end opening 24. Next, the front opening / closing driving device 32 is driven to close the front gate 31, and the neck cutout portion 33 of the fan-shaped plate 31b is fitted to the neck portion 7d of the extendable spoke 7B. Thereby, the pressure chamber 2 side and the inside of the partition main body 21 are shut off.

When the excavated soil is muddy water, the muddy water that has entered the work compartment 20 is discharged by the muddy water discharging device. Then, the back hatch 28 is opened to remove the solid earth and sand that has flowed into the work compartment 20, and the worker who has entered the work compartment 20 performs inspection and replacement work of the cutter bit 8.

Here, by using a well-known technique, the fixed cylinder 7b of the movable spoke 7B is configured to be rotatable about the axis of the spoke, so that the cutter bit 8 can be exchanged with the cutter bit 8 facing the rear side. Can be performed, and workability can be improved.

When the replacement operation is completed, the rear hatch 28 is closed, the front gate 31 is opened, the cutter head 4 is moved forward by the cutter retreat mechanism 11, and the telescopic spokes 7B
From the work compartment 20. Next, the cutter head 4 is rotated by a predetermined angle, the next telescopic spoke 7B is arranged in front of the work compartment 20, and the cutter bit 8 is replaced in the same procedure.

In this way, all the spokes 7B
After the cutter bit 8 is replaced, the cutter head 4 is returned to the excavation position by the cutter retreat mechanism 11, and the front opening 23 is opened by the front opening / closing device 26 and the end opening device 24.
Then, the end opening 24 is closed, and the excavation operation is restarted.

According to the above embodiment, the work compartment 20 is installed on the pressure bulkhead 3 and the cutter retreat mechanism 11
As a result, the cutter head 4 is retracted, and the telescopic spokes 7B are inserted into the work compartment 20, and the maintenance inspection of the telescopic spokes 7B and the replacement work of the cutter bit 8 can be performed in the work compartment 20, so that this inspection and The replacement work can be performed safely in a short time. In addition, since the work compartment 20 is installed on the pressure bulkhead 3, the flowability of the excavated earth and sand is hardly hindered. Therefore, the work compartment 20 having a size capable of accommodating the entire retractable spoke 7B in the contracted state is provided. It is possible to work on the entire cutter bit 8 of the telescopic spokes 7B at a time, so that a wide working range can be secured, and work can be performed more efficiently.

The cutter bit 8 of the fixed spoke 7A
Was not exchanged, but the excavation ability was sufficiently obtained only by replacing the cutter bit 8 of the telescopic spoke 7B.
Half of cutter bits 8 considering down time and parts cost
Has been replaced. Of course, all of the cutter bits 8 can be replaced with telescoping spokes 7B and most of the cutter bits 8 can be replaced. Even if the fixed spokes 7A are long enough to move to the pressure chamber 2, the working compartment 20 And the cutter bit 8 can be exchanged.

Further, a plurality of work compartments 20 may be installed. In this case, replacement of the cutter bit 8 and maintenance and inspection work time can be further reduced, and each of the extension spokes 7B to be replaced can be provided. By installing the work compartment 20, work can be performed without rotating the cutter head.

Next, a second embodiment of the shield machine according to the present invention will be described with reference to FIGS. The same members as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

In the previous embodiment, the front opening / closing device 26 having a pair of left and right front gates 31 is provided in the front opening 23 of the work compartment 20, whereas in the second embodiment, the front opening / closing device 26 is provided in the left / right direction. 1 that can be turned to open and close the front opening 23
A front opening / closing device 41 having a plurality of front gates 42 is provided.

That is, the front opening / closing device 41 is a single front gate 42 having an arc-shaped cross section capable of rotating in the left / right direction to open and close the front opening 23, and a front opening / closing driving device for driving the front gate 42 to open and close. (Such as a hydraulic jack) 43. The front gate 42 is connected to the front opening 23.
An arc-shaped front plate 42a for covering the
a fan-shaped guide plate 42b attached to the upper side of the a and rotatably supported by the rotation shaft 44;
5 and an arc-shaped plate 42c that covers the front part of the end opening 24. The front opening / closing drive device 43 includes a door opening / closing motor 43a and the door opening / closing motor 43a.
a and a rotation transmission shaft 43b for linking and rotating the rotation shaft 44
The rotating shaft 44 is rotated by a door opening / closing motor 43a via a wrapping transmission mechanism 43b to rotate the front gate 42
Can be rotated left and right to open and close the front opening 23.

The end opening 24 formed in the bottom plate 21c is formed in a polygonal shape into which the neck 7d of the telescopic spoke 7B can be fitted. In addition, the front surface of the neck 7d is formed in an arc shape so as to be along the inner edge of the arc plate 42c, so that the telescopic spokes 7B are formed.
When the arc-shaped plate 42c is closed after the is fitted, the arc-shaped plate 42c closes the rest of the end face opening 24. Also, in the end face opening 24,
A slide plate 34 guided in the front-rear direction along the shield axis O via a rail, and an end face opening / closing drive device (a hydraulic jack or the like) 35 for driving the slide plate 34 back and forth to open and close the end face opening 24. Is provided.

According to the above configuration, the front opening / closing driving device 43
The front gate 42 is opened to open and close the front opening 23, and the arc-shaped plate 42c of the front gate 42 further covers the front part of the end face opening 24 of the neck 7d fitted into the end opening 24. The cutter bit 8 can be replaced and inspected while being shielded from the pressure chamber 2 in the work compartment 20. Therefore, the same operation and effect as those of the first embodiment can be obtained.

Further, a third embodiment will be described with reference to FIGS. The same members as those in the above embodiment are denoted by the same reference numerals, and description thereof will be omitted. In the previous embodiment, only the cutter head 4 is retracted and the work compartment 20
However, in the third embodiment, the cutter head 4
The retreat is made a small distance away from the face, and conversely, the working compartment 20 is moved by the compartment projecting mechanism 50 to the pressure chamber 2.
By moving the cutter head 4 forward to the side, the cutter head 4 is housed in the work compartment 20.

That is, the partition body projecting mechanism 50 is provided with a guide cylinder 51 which slidably supports the work partition body 20 forward along the shield axis O in the partition notch 22 of the pressure partition wall 3. The work compartment 20 is slidably fitted into the guide cylinder 51 via a guide member and a seal member (not shown). On the back side of the work compartment 20, there is provided a compartment projecting drive device 52 composed of a hydraulic cylinder or an electric jack for driving the work compartment 20 out and back.

The structure of the work compartment 20 is the same, but at the retracted position, the guide tube 51 allows the end opening 24 to be opened.
Is closed, the end face opening / closing device 27 is not provided. In the above configuration, when the cutter bit 8 is worn and the excavation speed is reduced during excavation of the tunnel by the shield machine, excavation is stopped. When the excavated earth and sand is solid, a predetermined amount of earth and sand in the pressure chamber 2 is removed by the earth removal device, and in the case of muddy water, the target telescopic spokes 7B To stop. Then, after the retractable spokes 7B are contracted, the cutter head 4 is retreated to the pressure chamber 2 side by the cutter retreat mechanism 11 to retreat from the face. Next, the work compartment body 20 is moved forward by the compartment body projecting drive device 52 to project into the pressure chamber 2, and further, the slide plate 34 is retracted by the end face opening and closing device 27, and then the front gate 31 is moved by the front opening and closing device 26. Is released, and the work compartment 20 is further moved forward, whereby the telescopic spokes 7B are fitted into the work compartment 20 through the front opening 23 and the end face opening 24. Further, the front opening / closing drive device 32 is driven to close the front gate 31, and the neck notch 33 of the fan-shaped plate 31b is fitted to the neck 7d of the extendable spoke 7B. Thereby, the pressure chamber 2 side and the inside of the work compartment 20 are shut off.

When the excavated soil is muddy, the work compartment 2
The muddy water that has entered 0 is discharged by the muddy water discharger. Then, the back hatch 28 is opened to remove the earth and sand that has flowed into the work compartment 20, and a worker enters the work compartment 20, and the cutter bit 8 is inspected and replaced.

According to the above-described embodiment, in addition to the functions and effects of the first and second embodiments, the depth of the pressure chamber 2 is made small so that the retreat amount of the cutter head 4 is slightly away from the face. It is possible to carry out replacement maintenance work while the cutter head 4 has the function of retaining the cutting face.

[0043]

As described above, according to the first aspect of the present invention, when the cutter bit is worn during excavation, the target cut-spoke and the work compartment body are opposed to each other and opened and closed. The opening of the work compartment is opened by the device, and the cutter head is retracted by the cutter retreat mechanism, or the work compartment is moved forward by the compartment projecting mechanism, and the cut-spoke is stored in the work compartment through the opening. I do. Then, after the opening is closed by the opening / closing device, the worker enters the work compartment and replaces and performs maintenance and inspection of the cutter bit of the cut spoke.

Therefore, the inspection and replacement work can be performed safely in the work compartment separated from the pressure chamber to which the face holding pressure is applied, and the work compartment installed on the partition has little effect on the flow of excavated earth and sand. Because it can be formed large,
A wide range of cutter bits of the cutter spokes housed in the working compartment can be replaced and serviced at once.

According to the second aspect of the present invention, since the notch portion which is fitted to the cut-spoke is formed in the rotary plate of the front gate, the front gate is inserted after the cut-spoke is accommodated in the work compartment. Can be closed at the same time as the front opening is closed, and at the same time the remaining end opening where the Katas spokes are fitted can be closed. Intrusion can be prevented, and replacement and inspection work can be performed safely.

According to the third aspect of the invention, the opening and closing of the front gate can be restricted by the rotation locking portion, and the opening of the front gate due to erroneous operation and friction with earth and sand can be prevented.

According to the fourth aspect of the present invention, the gate plate having the arc-shaped cross section can cope with the high-pressure face collapsed earth pressure. In addition, the rotation end closing portion provided on the gate plate can close the remaining end face opening where the Katas spoke is fitted, and the inside of the working compartment containing the Katas spoke and the pressure chamber holding the face collapse earth pressure. To prevent intrusion of earth and sand or muddy water, and perform safe replacement and inspection work.

According to the fifth aspect of the present invention, by making the cut spokes extendable, the outermost cutter bit having the largest wear can be easily replaced. According to the cutter bit exchanging method in the shield excavator according to claim 6, at the time of exchanging the cutter bit, at least one of the working section and the cutter head is moved in the shield axis direction to move the cutter spoke into the working section. Since the replacement operation is performed while being housed in the body, the cutter bit can be replaced safely and widely over a single time, and the replacement operation can be performed efficiently in a short time.

[Brief description of the drawings]

FIG. 1 is an overall side sectional view showing a first embodiment of a shield machine according to the present invention.

FIG. 2 is an overall front view of the shield machine.

FIG. 3 is an overall plan sectional view of the shield machine.

FIG. 4 is a plan sectional view showing a working section of the shield machine.

FIG. 5 is a side sectional view showing a working section of the shield machine.

FIG. 6 is a plan sectional view showing an open state of the work compartment.

FIG. 7 is a plan cross-sectional view showing a state where the cutter head is housed in the work compartment.

FIG. 8 is a side sectional view showing a state where the cutter head is accommodated in the work compartment.

FIG. 9 is a transverse sectional view showing an end face opening of the work compartment.

FIG. 10 is a plan sectional view of a working section showing a shield machine according to a second embodiment of the present invention.

FIG. 11 is a side sectional view showing a working section of the shield machine.

FIG. 12 is a plan sectional view showing an open state of the work compartment.

FIG. 13 is a side cross-sectional view showing a cutter head housed state of the work compartment.

FIG. 14 is an overall side sectional view showing a third embodiment of a shield machine according to the present invention.

FIG. 15 is an overall plan sectional view of the shield machine.

FIG. 16 is a side sectional view showing a working section of the shield machine.

FIG. 17 is a plan sectional view showing a working section of the shield machine.

FIG. 18 is a plan sectional view showing the opened state of the work compartment.

FIG. 19 is a side cross-sectional view showing a cutter head housed state of the work compartment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shield main body 2 Pressure chamber 3 Pressure bulkhead 4 Cutter head 7A, 7B Cutter spoke 7d Neck part 8 Cutter bit 11 Cutter retreat mechanism 12 Cutter drive device 20 Work compartment 21 Partition chamber 23 Front opening 24 End opening 25 Back entrance 26 Front opening / closing device 27 End opening / closing device 28 Back hatch 41 Front opening / closing device 42 Front gate 42c Arc-shaped plate 43 Front opening / closing drive device 50 Partition body projection mechanism 51 Guide cylinder 52 Partition projection drive device

Claims (6)

[Claims] 1. A pressure chamber formed by a partition at a front portion of a shield main body, a cutter head rotatably disposed at a front portion of the pressure chamber, and a cutter head protruding radially from a center member at the cutter head. A shield excavator equipped with a plurality of cutter spokes to which a large number of cutter bits are attached, wherein a work compartment is provided on the partition wall, in which the cutter bits can be exchanged while accommodating the cutter bits, and At the front part of the partition, an opening through which a cut-spoke can be inserted, and an opening / closing device that can open and close the opening before or after accommodating the cut-spoke, respectively, are provided. A cutter retracting mechanism capable of retracting the cut-spoke into the working compartment by allowing the working compartment to retract along the shield and the working compartment protruding along the shield axis direction. Shield machine is characterized by providing at least one of which can accommodate partition body projecting mechanism in the work compartment body Tasupoku. 2. An opening is constituted by a front opening formed on the front surface of the work compartment and an end opening formed on the shield axis side, and the front gate is divided into two parts on the left and right sides. And the front opening is configured to be openable and closable, and a turning plate portion is provided on the end face opening side of the left and right front gates, and a cutout portion is formed to be externally fitted to the cut spokes accommodated in the turning plate portion. The shield machine according to claim 1, wherein the shield machine is used. 3. A closing gate for reciprocating in a direction of a shield axis and capable of opening and closing an end face opening, wherein the front gate is kept closed at a closed position of the end face opening of the slide gate. The shield machine according to claim 2, further comprising a portion. 4. An opening comprising a front opening formed on the front surface of the work compartment and an end opening formed on the shield axis side, wherein the front gate is formed around a radial axis. A gate plate having an arc-shaped cross section that can be rotated to open and close a front opening can be configured, and a front portion of an end opening that accommodates a cut-spoke can be closed at an end opening side of the gate plate. The shield machine according to claim 1, further comprising a rotation closing portion. 5. A cut-spoke, which is to be replaced with a cutter bit, is configured to be extendable and contractable so that a cut-spoke including an outer end side can be accommodated in a work compartment. The shield machine described. 6. A shield excavator in which a cutter head having a plurality of radially projecting cutter spokes is rotatably arranged at a front portion of a shield body, and when a cutter bit provided on the cutter spoke is replaced. Move at least one of the work compartment installed on the bulkhead in front of the shield body and the cutter head in the direction of the shield axis to house the cutter spoke in the work compartment and replace the cutter bit. A cutter bit replacement method for a shield machine.