JP2003184474A - Structure of shield machine and method for replacing its roller cutter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure of a shield machine capable of performing replacement work for a roller cutter even in a place having much spring water under the sea, and a method for replacing its roller cutter. <P>SOLUTION: This structure of the shield machine is formed by an outer peripheral cutter 11 forming an annular advance surface of the shield machine, and a center cutter 11 disposed inside the outer peripheral cutter. The outer peripheral cutter 11 and the center cutter 21 are capable of rotating and moving in the advancing direction in a body or in a separate body. Each cutter head is provided with a removable type roller cutter projected in the advancing direction, a jack capable of moving the roller cutters 31, 32 is provided on the back of each cutter head, and further a work lock 6 storing roller cutters 31, 32 to perform replacement work is disposed at the back of the center cutter 21. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a shield machine and a method for replacing a roller cutter of the shield machine.

[0002]

2. Description of the Related Art Conventionally, a shield machine a has been used to construct a tunnel in the ground. It is possible to use one unit or a combination of shields of various sizes, and change the cross-sectional shape to be excavated, depending on the intended use of the tunnel to be constructed.

When excavating a sedimentary rock mass with a shield machine a, a roller cutter b is often used in combination with a cutter bit in front of a cutter head c (see FIG. 10). Since the roller cutter b is arranged so as to project to the front,
The wear is severe, and the roller cutter b may have to be replaced by excavation for several hundred meters. For this reason, it is necessary to replace the worn roller cutter b. As a means for that, the shield machine a for excavation is temporarily stopped, then the shield machine a is retracted, and the worker is placed in the space formed between the face and the cutter head c. Then, the roller cutter b was manually replaced (see FIG. 9).

[0004]

The structure of the above-mentioned conventional shield machine and the method for replacing the roller cutter thereof have the following problems. <A> When replacing the roller cutter, a worker comes out in a space formed between the face and the cutter head to perform the replacement work. Therefore, when there is a lot of spring water under the seabed, the roller cutter cannot be replaced, and since it goes out of the shield machine, the worker is at risk of collapsing the ground. <B> Further, in order to ensure the safety of the worker who performs the replacement work outside the shield, the ground may be strengthened by the ground improvement such as the chemical injection method. Therefore, a construction period, a large construction cost, labor, etc. are required, which is not economical. In addition, there is concern about natural destruction due to ground improvement. <C> Furthermore, until the ground is strengthened, work outside the shield involves danger, so ground improvement must be performed from inside the shield machine. Therefore, the work efficiency is low and the construction period is extended. <D> The replacement work of the roller cutter is performed in the space formed between the face and the cutting face by retracting the shield machine that has once advanced in the excavation direction. Therefore, work efficiency is poor.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and it is possible to replace a roller cutter of a shield machine even in a place where the amount of spring water is large, such as below the sea surface. It is an object to provide a structure of a machine and a method of replacing the roller cutter. It is another object of the present invention to provide a structure of a shield machine that can be safely replaced without risk of replacement of the roller cutter, and a method of replacing the roller cutter. In particular, it is an object of the present invention to provide a structure of a shield machine and a method for replacing the roller cutter, which does not require ground reinforcement for replacing the roller cutter, and which saves a construction period or a large construction cost or labor as much as possible. In addition, another object of the present invention is to provide a structure of a shield machine in which natural destruction due to ground improvement or the like for replacing the roller cutter is small and a method for replacing the roller cutter. Another object of the present invention is to provide a structure of a shield machine having a space inside the shield machine sufficient for replacing the roller cutter and a method for replacing the roller cutter. In addition, it is an object of the present invention to provide a structure of a shield machine that does not require a dug in the shield machine and a method of replacing the roller cutter when the roller cutter is replaced.
It is another object of the present invention to provide a structure of a shield machine and a method for replacing the roller cutters, which allows the replacement work of all the roller cutters arranged in the shield cutter to be carried out with a minimum of devices and equipment. The present invention achieves at least one of these objectives.

[0006]

In order to achieve the above-mentioned object, the structure of the shield machine of the present invention has an outer peripheral cutter that forms an excavation surface of the shield machine in an annular shape, and an inner peripheral surface of the outer peripheral cutter. Formed with a central cutter to
In the structure of a shield machine in which the outer peripheral cutter and the central cutter can rotate and move in the excavating direction as a single body or as separate bodies, in the outer peripheral cutter, a plurality of circumferentially arranged detachable detachable protrusions are provided. Is provided with a roller cutter, a rear pull-out jack for moving the roller cutter in the radial direction is provided on the back surface of the central cutter, and a space for carrying out the exchange work by accommodating the roller cutter behind the central cutter. Work locks are in place.

Further, the structure of the shield machine according to the present invention is formed by an outer peripheral cutter forming an excavation surface of the shield machine in an annular shape and a central cutter arranged inside the outer peripheral cutter. In the structure of the shield machine that can be rotated and moved in the excavation direction integrally or separately from the cutter, the central cutter is provided with a detachable roller cutter projecting in the excavation direction that is arranged in a plurality in the circumferential direction, An extruding jack for replacement that moves the roller cutter in the radial direction is provided on the back surface of the outer peripheral cutter, and a work lock, which is a space for accommodating the roller cutter and arranging the exchanging work, is disposed behind the central cutter. .

Further, in the structure of the shield machine of the present invention, the shield machine is formed by an outer peripheral cutter forming an excavation surface in an annular shape and a central cutter arranged inside the outer peripheral cutter, and the outer peripheral cutter and the central cutter are provided. In the structure of the shield machine which can rotate and move in the excavation direction integrally with or separately from, the outer peripheral cutter is provided with a detachable roller cutter projecting in the excavation direction, which is arranged in plural in the circumferential direction. An extruding jack for replacement for moving the roller cutter in the radial direction is provided on the rear surface, and a detachable roller cutter protruding in the excavation direction, which is arranged in the circumferential direction, is provided on the central cutter. A pullout jack for replacement that moves the roller cutter in the radial direction is provided, and in the space where the roller cutter is stored behind the central cutter for replacement work. It is arranged the work lock that.

In particular, the structure of the shield machine of the present invention is
In the structure of the shield machine according to any one of the above,
A transfer jack that can expand and contract in the excavation direction is stored in the work lock, and the roller cutter is incorporated into the work lock by the transfer jack.

Further, the method of replacing the roller cutter of the shield machine structure of the present invention requires the replacement of the roller head, which stops rotation of the cutter head and is arranged on the outer peripheral cutter, by using the structure of the shield machine. The replacement pull-out jacks arranged on the roller cutter and the central cutter are arranged on a straight line by rotation of the cutter head, and the roller head and the replacement cutter are moved by moving the cutter head in one direction of excavation. Place the pull-out jacks on approximately the same plane, pull the roller cutter toward the center by the exchange pull-out jack, store the roller cutter in the work lock, and then replace the roller cutter in the work lock. It is characterized by performing.

Further, the method of replacing the roller cutter of the shield machine structure according to the present invention uses the structure of the shield machine described above to stop the rotation of the cutter head and arrange the center cutter for replacement. The replacement extrusion jacks arranged on the roller cutter and the outer peripheral cutter are respectively arranged in a straight line by the rotation of the cutter head, and the roller cutter and the replacement extrusion are arranged by moving one of the cutter heads in the excavation direction. Arrange the jacks on substantially the same plane, pull the roller cutter toward the outer peripheral cutter by the replacement extrusion jack, align the cutter head surfaces, and push the replacement extrusion jack to lock the roller cutter. Of the roller cutter, and then the roller cutter is housed in the work lock. And characterized by performing the replacement of Rakatta.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

<B> Overall Configuration FIG. 1 is a schematic sectional view of the shield machine. The present invention is
It is a shield machine that consists of a single-circle, substantially circular shield cutter. The structure of the cutter head is roughly classified into an outer peripheral cutter 11 forming an annular shape and a central cutter 21 forming the inner side thereof. At the time of excavation, the outer cutter 11 and the central cutter 21 are integrally rotated by a fixture such as a pin. On the other hand, by removing this fixing tool, the outer peripheral cutter 11 and the central cutter 21 can be rotated separately as separate bodies. Therefore, each cutter can be provided with the outer peripheral drive motor 12 and the central drive motor 22, respectively.

<B> Outer peripheral cutter A plurality of removable roller cutters 31 can be arranged in the outer peripheral cutter 11 in the circumferential direction. This roller cutter 31
Is stored in the cassette 33, and this cassette 3
A cassette groove 35 for accommodating 3 is formed in the front surface of the outer peripheral cutter 11 in the digging direction in the radial direction. Cassette groove 3
No. 5 needs to be opened only in the center direction, and may not be opened in the outward direction. Further, a replacement push-out jack 5 is installed on the back surface of the outer peripheral cutter 11 in the radial direction, and expands and contracts toward the center of the cutter.

<C> Central Cutter In the central cutter 21, a plurality of removable roller cutters 32 can be arranged in the circumferential direction. This roller cutter 32
Is stored in the cassette 33, and this cassette 3
A cassette groove 36 for accommodating 3 is formed on the front surface of the central cutter 21 in the excavation direction in the radial direction. Cassette groove 3
6 need only be open outward and need not be formed up to the center of the central cutter 21. A replacement pull-out jack 4 is installed on the back surface of the central cutter 21 in the radial direction, and is arranged so as to expand and contract toward the outside.

A work lock 6 which is a space for replacing the roller cutters 31 and 32 is provided behind the central cutter 21, and a cylindrical body 81 formed so as to cover the work lock 6 is integrated with the central cutter 2. Can be formed. The central cutter 21 and the tubular body 81 are integrally formed, and can be moved back and forth along the tubular body guide 82 in the excavation direction. Further, only the central cutter 21 can move independently.

<D> Roller cutters The roller cutters 31 and 32 are respectively incorporated in the cassette 33, and a plurality of roller cutters 31 and 32 are arranged in the circumferential direction of the outer cutter 11 and the central cutter 21. The cassette 33 can be fixed to each cutter by a fixing tool such as a pin. The outer shape of the cassette 33 is a cubic three-dimensional shape, and the inner shape has a structure in which the roller cutters 31 and 32 can be easily removed and replaced (see FIG. 4). The roller cutters 31 and 32 are arranged so as to partially project from the cassette 33, and the protruding portions are arranged on the respective cutters in the excavation direction and serve as portions for excavating rock mass. A mechanism for gripping with various jacks can be provided on the bottom surface and the radial side surface of the cassette 33.

If a gap is formed in the radial direction of the cassette groove 35, a cassette 34 without the roller cutter 31 can be incorporated to prevent sand or the like from entering.
The cassette 34, in which the cassette 34 and the roller cutters 31 and 32 are incorporated, may be provided with a mechanism for integrally forming and moving the both in response to a radial force. For example, from the back side of the cassette groove 35 toward the open side, the cassette 3
3, when the cassette 34 is arranged in this order, the cassette 34
When a pulling force is applied to the center of the cassette, the cassette 33 also moves together. In this way, the roller cutters 31 and 32 can be pulled out from the cassette groove 35 and replaced. As a result, the roller cutter 3 can be attached to any place on the shield cutter surface.
1, 32 can be arranged and can be replaced.

<E> Replacement Extraction Jack The replacement extraction jack 4 can be arranged on the back surface of the central cutter 21 in the radial direction. The replacement pull-out jack 4 is expandable and contractable toward the outside of the cutter, and can pull out or push out the roller cutter 31 arranged on the outer peripheral cutter 11 toward the center. Therefore, a mechanism for gripping and detaching the cassette 33 is provided at the tip of the exchange pull-out jack 4.

<F> Replacement Extrusion Jack The replacement extrusion jack 5 can be arranged on the back surface of the outer peripheral cutter 11 in the radial direction. The replacement push-out jack 5 is expandable and contractible toward the center of the cutter, and can pull out or push out the roller cutter 32 arranged in the central cutter 21 toward the outside.
Therefore, a mechanism for gripping and detaching the cassette 33 is provided at the tip of the replacement extruding jack 5.

<G> Work lock The work lock 6 is a work space for replacing the roller cutters 31 and 32, and is arranged behind the central cutter 21 (see FIG. 1). An openable and closable gate can be arranged at the front opening of the work lock 6, so that the work lock 6 can be freely shielded from the outside. Also,
The work lock 6 can also have a mechanism that can move independently in the direction of excavation.

The work lock 6 can be arranged inside a cylindrical body 81 formed so as to cover the periphery of the work lock 6. In addition, the central drive motor 22 that independently rotates the central cutter 21 may be provided inside the cylindrical body 81. Further, the tubular body 81 and the central cutter 21 may be integrally formed so as to be interlocked with the front-back movement of the central cutter 21, or the central cutter 21 may be independently moved. As a mechanism for moving the tubular body 81, for example, a tubular body moving jack 83 that can expand and contract in the digging direction outside the tubular body 81, and a reaction force member 84 that receives the reaction force thereof.
The cylinder 81 can be moved by arranging. That is, the tubular body 81, the work lock 6, and the central cutter 21, which are integrally formed by the extension of the tubular body moving jack 83 having one end fixed, can be moved in the digging direction.
It can also be moved backward by shortening. The mechanism for moving the central cutter 21 does not necessarily have to be the above mechanism.

<H> Delivery Jack The delivery jack 7 is arranged inside the work lock 6 in the direction of excavation, and is arranged so as to project from the opening of the work lock 6 and extend. The delivery jack 7 is
The roller cutters 31 and 32 located in front of the work lock 6 can be housed in the work lock 6, or the newly replaced roller cutter can be pushed out and moved from the work lock 6 to a predetermined position. Therefore, a mechanism for gripping the roller cutters 31, 32 is provided at the tip of the delivery jack 7.

Next, an embodiment of a method for replacing the roller cutter arranged on the outer peripheral cutter using the shield machine of the present invention will be described.

[0025]

[Embodiment 1] <A> Arrangement at a predetermined position The shield machine for excavation is stopped from rotating (see FIG. 2). After stopping the rotation, the fixing tool that connects the cutters to each other is released, and the roller cutter 31 arranged on the outer peripheral cutter 11 and the replacement extraction jack 4 arranged on the back surface of the central cutter 21 are collinearly rotated by the rotation of the cutter. To place. At this time, it is preferable to arrange the roller cutter 31 so as to be located above the cutter head. This is to prevent sand or the like from entering the cassette groove 35 from the excavated surface. <B> Movement of central cutter head Next, the central cutter 21 is moved forward so that the roller cutter 31 arranged on the outer peripheral cutter 11 and the replacement extraction jack 4 arranged on the back surface of the central cutter 21 are flush with each other in the excavation direction. Place (see FIG. 3). The forward movement of the central cutter 21 may be movement accompanied by excavation of rock mass. <C> Movement of roller cutter After that, the fixing of the roller cutter 31 is released from the outer peripheral cutter 11. The withdrawal jack 4 for replacement is extended outward to grip the side surface of the roller cutter 31. The roller cutter 31 is pulled out from the cassette groove 35 and is pulled in on the back surface of the central cutter 21. After that, the front gate of the work lock 6 located behind the central cutter 21 is opened, the delivery jack 7 is extended, and the roller cutter 31 is gripped. At the same time, the grip by the replacement extraction jack 4 is released, and the roller cutter 31
Is taken into the work lock 6. <D> After exchanging the roller cutter into the work lock 6 by the transfer jack 7, the gate located in front of the work lock 6 is closed. Roller cutter 31 taken into the work lock 6
Is removed from the cassette 33 and a new roller cutter 3
Replace with 1 and attach to the tip of the delivery jack 7. The above work is rewound, and the newly replaced roller cutter is arranged at a predetermined position. After the replacement of the roller cutters, the roller cutters 31 arranged on the outer peripheral cutter 11 can be replaced in the same manner by the same procedure.

[0026]

[Embodiment 2] <B> Arrangement at a predetermined position The rotation of the shield machine for excavation is stopped (see FIG. 6). After the rotation is stopped, the fixture for connecting the cutters to each other is released, and the roller cutter 32 arranged on the central cutter 21 and the replacement push-out jack 5 arranged on the rear surface of the outer peripheral cutter 11 are collinearly rotated by the rotation of the cutter. To place. At this time, it is preferable to arrange the roller cutter 32 so as to be positioned below the cutter head. This is to prevent sand or the like from entering the cassette groove 36 from the excavated surface. <B> Movement of central cutter head Next, the central cutter 21 is moved rearward so that the central cutter 21
Then, the roller cutter 32 arranged on the upper side and the replacement pushing jack 5 arranged on the back surface of the outer peripheral cutter 11 are arranged on the same plane (see FIG. 7). <C> Moving the roller cutter After that, the fixing of the roller cutter 32 is released from the central cutter 21. The extruding jack 5 for replacement is extended in the central direction to grip the side surface of the roller cutter 32. Roller cutter 32
After being pulled out from the cassette groove 36 and pulled in on the back surface of the outer peripheral cutter 11, the central cutter 21 is moved forward to align the surfaces of the central cutter 21 and the outer peripheral cutter 11. After that, the roller cutter 32 is pushed to the front of the work lock 6 by the extension of the replacement pushing jack 5. At the same time, the roller cutter 32 is gripped by opening the front gate of the work lock 6 and extending the transfer jack 7. The grip by the replacement extrusion jack 5 is released, and the roller cutter 32 is taken into the work lock 6. <D> The procedure for replacing the roller cutter with a new roller cutter is the same as in the first embodiment.

[0027]

The structure of the shield machine of the present invention and the method for exchanging the roller cutter thereof are as described above, so that the following effects can be obtained. <A> The shield machine of the present invention comprises a cutter head, which is composed of an outer peripheral cutter forming an annular shape and a central cutter forming the inner side thereof. The central cutter can be moved back and forth in the excavation direction, and is a detachable roller. The cutter and a work lock for replacing the roller cutter are arranged behind the central cutter, and the front of the work lock has a structure in which the gate is shut off from the outside. Therefore, it is not necessary to go out of the shield machine to replace a new roller cutter, which allows the roller cutter to be replaced even in a place where there is a lot of spring water, such as under the sea surface, or in an environment with high groundwater. In addition, there is no danger due to the collapse of the ground. <B> The replacement work of the roller cutter can be performed in a work lock provided in the shield machine. Therefore, it is not necessary to go out of the shield machine, and the replacement work can be performed safely. Moreover, since it is not necessary to go out of the shield, it is not necessary to strengthen the ground. As a result, the construction period is shortened, the construction cost is reduced, and the labor is reduced, which is economical. And it is kind to nature. <C> Further, since the replacement space for the roller cutter is provided in the shield machine, a relatively large space can be formed, which leads to an efficient replacement work. <D> The roller cutter that needs to be replaced can be taken into the work lock only by rotating each cutter head and expanding and contracting the jack. Therefore, there is no need to build a replacement work space outside the shield, and no extra movement of the shield body is required. <E> A work lock with a gate that can freely move in and out can be provided inside the shield machine, and its opening is blocked by the gate. Therefore, in the unlikely event that the shield machine breaks down, it is possible to open the gate and exit from the work lock.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of an embodiment of the structure of a shield machine of the present invention.

FIG. 2 is a schematic front view of an embodiment of the structure of the shield machine of the present invention and the method for replacing the roller cutter.

FIG. 3 is a schematic perspective view of an embodiment of the structure of the shield machine of the present invention and the method of replacing the roller cutter.

FIG. 4 is a cross-sectional view of a roller cutter having a shield machine structure according to the present invention.

FIG. 5 is a detailed view of the structure of the shield machine according to the present invention in which the roller cutter is housed in the cutter head.

FIG. 6 is a schematic front view of an embodiment of the structure of the shield machine and the method for replacing the roller cutter of the present invention.

FIG. 7 is a schematic perspective view of an embodiment of the structure of the shield machine and the method for replacing the roller cutter of the present invention.

FIG. 8 is a schematic perspective view of an embodiment of the structure of the shield machine and the method for replacing the roller cutter of the present invention.

FIG. 9 is an explanatory diagram when a roller cutter of a conventional shield machine is replaced.

FIG. 10 is a front view of a conventional shield machine.

[Explanation of symbols]

11 ... Outer cutter 21 ... Central cutter 31 ... Laura cutter 32 ... Roller cutter 4 ... Replacement withdrawal jack 5: Replacement extrusion jack 6 ... Work lock 7 ... Handover jack

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Mitsuhiko Ota             1-25-1 Nishi-Shinjuku, Shinjuku-ku, Tokyo Taisei             Construction Co., Ltd. (72) Inventor Itsuo Hirano             1-25-1 Nishi-Shinjuku, Shinjuku-ku, Tokyo Taisei             Construction Co., Ltd. (72) Inventor Masatoshi Kimura             1-25-1 Nishi-Shinjuku, Shinjuku-ku, Tokyo Taisei             Construction Co., Ltd. (72) Inventor Takanobu Miki             11-11 Kitahamacho, Chita City, Aichi Prefecture Ishikawajima Harima             Heavy industry Aichi factory (72) Inventor Hiroyuki Ito             11-11 Kitahamacho, Chita City, Aichi Prefecture Ishikawajima Harima             Heavy industry Aichi factory (72) Inventor Nakajima Univ.             11-11 Kitahamacho, Chita City, Aichi Prefecture Ishikawajima Harima             Heavy industry Aichi factory (72) Inventor Makoto Sugimori             11-11 Kitahamacho, Chita City, Aichi Prefecture Ishikawajima Harima             Heavy industry Aichi factory F term (reference) 2D054 AC02 AD07 BA06 BB02 BB06                       BB07

Claims (6)

[Claims] 1. A shield machine is formed by an outer peripheral cutter forming a ring-shaped excavation surface and a central cutter arranged inside the outer peripheral cutter. The outer peripheral cutter and the central cutter are rotated integrally or separately. In a structure of a shield machine capable of moving in a digging direction, the outer peripheral cutter is provided with a plurality of detachable roller cutters protruding in the digging direction arranged in the circumferential direction, and the roller cutter is provided on the back surface of the central cutter. The structure of the shield machine is characterized in that a replacement pull-out jack that moves in a radial direction is provided, and a work lock that is a space for accommodating the roller cutter and performing a replacement work is disposed behind the central cutter. 2. A shield machine is formed by an outer peripheral cutter forming an excavation surface in an annular shape and a central cutter arranged inside the outer peripheral cutter, and the outer peripheral cutter and the central cutter are rotated integrally or separately. In the structure of a shield machine that can move in the excavation direction, the central cutter is provided with a plurality of detachable roller cutters protruding in the excavation direction, which are arranged in the circumferential direction, and the roller cutter is provided on the back surface of the outer peripheral cutter. The structure of the shield machine is characterized in that an extruding jack for replacement that moves in the radial direction is provided, and a work lock, which is a space for accommodating the roller cutter and performing an exchanging operation, is arranged behind the central cutter. 3. The structure of the shield machine according to claim 1, wherein the central cutter is provided with a plurality of detachable roller cutters projecting in an excavating direction, which are arranged in the circumferential direction, and the rear surface of the outer cutter is provided with the detachable roller cutter. The structure of the shield machine, which is equipped with a replacement extrusion jack that moves the roller cutter in the radial direction. 4. The structure of the shield machine according to any one of claims 1 to 3, wherein a transfer jack capable of expanding and contracting in the excavation direction is stored in the work lock, and the work lock is provided by the transfer jack. The structure of the shield machine, characterized by incorporating the roller cutter inside. 5. A method of replacing a roller cutter of the outer peripheral cutter by using the structure of the shield machine according to claim 1, 3, or 4, wherein rotation of a cutter head is stopped, and the outer peripheral cutter is stopped. The replacement pullout jacks to be arranged in the roller cutter and the central cutter that need to be replaced are arranged on a straight line by the rotation of the cutter head, and by moving one of the cutter heads in the excavation direction, The roller cutter and the replacement extraction jack are arranged on substantially the same plane, and the roller cutter is pulled toward the center by the replacement extraction jack, and then the roller cutter is housed in the work lock, A method for replacing a roller cutter of a shield machine, wherein the roller cutter is replaced with a new one. 6. A method of replacing a roller cutter of the central cutter by using the structure of the shield machine according to claim 2, wherein rotation of a cutter head is stopped, and the central cutter is rotated. The replacement extrusion jack to be arranged on the roller cutter and the outer peripheral cutter that need to be arranged are respectively arranged on a straight line by rotation of the cutter head, and by moving one of the cutter heads in the excavation direction, The roller cutter and the replacement extruding jack are arranged on substantially the same plane, and after pulling the roller cutter to the outer peripheral cutter by the replacement extruding jack, the respective cutter head surfaces are aligned to extrude the replacement extruding jack. Move the roller cutter to the front of the work lock, and then store the roller cutter in the work lock. And performing replacement of the roller cutter in the working lock, how to exchange the roller cutters of a shield machine.