JP2020197094A - Shield boring machine and method of removing bearing portion of shield boring machine - Google Patents

Abstract

To provide a shield boring machine that can easily perform the work for removing a bearing portion.SOLUTION: A shield excavator 100 comprises a cutter head 20 that rotates around a central axis A to excavate earth and sand, a movable partition wall 30 that supports the cutter head 20 and rotates together with the cutter head 20, a movable ring member 40 connected to the movable partition wall 30 so as to extend rearward from the movable partition wall 30, a fixed partition wall 12 fixedly provided on an outer peripheral side with respect to the movable partition wall 30, a bearing portion 50 that rotatably supports the movable ring member 40. The movable ring member 40 includes a connection fixing portion 41 that is connected and fixed to the fixed partition wall 12 when the bearing portion 50 is removed.SELECTED DRAWING: Figure 4

Description

The present invention relates to a shield excavator and a method of removing a bearing portion of the shield excavator.

Conventionally, a shield boring machine is known (see, for example, Patent Document 1).

In Patent Document 1, a cutter head that rotates around the central axis to excavate earth and sand, a movable partition wall that is arranged at the rear end of the chamber and supports the cutter head and rotates together with the cutter head, and a movable partition wall that rotates behind the movable partition wall are provided. A movable ring member fixed to the movable partition wall, a fixed partition wall arranged at the rear end of the chamber and fixedly provided on the outer peripheral side with respect to the movable partition wall, and a bearing portion that rotatably supports the movable partition wall. The shield excavator to be equipped is disclosed. The shield excavator of Patent Document 1 is configured to connect and fix the outer peripheral side portion of the movable partition wall and the fixed partition wall at the time of dismantling. After that, the bearing portion is configured to be removed from the movable partition wall fixed to the fixed partition wall.

Japanese Patent No. 4915949

However, in Patent Document 1, when the bearing portion is removed from the movable partition wall when the shield excavator is disassembled, the outer peripheral side portion of the movable partition wall arranged at the rear end of the chamber and the fixed partition wall are connected and fixed. It is configured in. For this reason, when connecting and fixing the movable partition wall and the fixed partition wall in order to remove the bearing portion, it is necessary to perform the fixing work while avoiding the movable ring member provided behind the movable partition wall. There is an inconvenience that it is difficult to easily fix the fixed partition wall. As a result, there is a problem that it is difficult to easily remove the bearing portion.

The present invention has been made to solve the above-mentioned problems, and one object of the present invention is a shield excavator and a shield excavator capable of easily performing an operation for removing a bearing portion. Is to provide a method of removing the bearing portion of the above.

In order to achieve the above object, the shield excavator in the first aspect of the present invention includes a cutter head that rotates around the central axis to excavate earth and sand, and a movable partition wall that supports the cutter head and rotates together with the cutter head. , A movable ring member connected to the movable partition wall so as to extend rearward from the movable partition wall, a fixed partition wall fixedly provided on the outer peripheral side of the movable partition wall, and a bearing portion that rotatably supports the movable partition wall member. The movable ring member includes a connection fixing portion which is connected and fixed to the fixing partition wall when the bearing portion is removed.

In the shield excavator according to the first aspect of the present invention, as described above, the movable ring member extending rearward from the movable partition wall is provided with a connection fixing portion that is connected and fixed to the fixed partition wall when the bearing portion is removed. Thereby, when the bearing portion is removed, the connection fixing portion of the movable ring member connected to the movable partition wall so as to extend rearward from the movable partition wall can be connected and fixed to the fixed partition wall. As a result, the cutter head and the movable partition wall can be fixed to the fixed partition wall via the movable ring member, so that it is not necessary to perform the fixing work while avoiding the movable ring member. As a result, the work for removing the bearing portion can be easily performed. As a result, the bearing can be easily removed in order to replace the bearing while the cutter head is in the earth and sand, or to remove the bearing and use it in another shield boring machine.

In the shield excavator according to the first aspect, preferably, the cutter drive portion for rotationally driving the cutter head, the mounting portion for which the bearing portion is mounted, and the mounting hole for mounting the cutter drive portion are included, and the bearing portion and the cutter are included. A plate-shaped support portion that supports the drive unit and extends in a direction substantially perpendicular to the central axis is further provided, and the connection fixing portion of the movable ring member is viewed in the central axis direction when the bearing portion is removed. , It is fixed to the fixed partition wall at a position overlapping the mounting hole of the support part. With this configuration, by removing the cutter drive portion from the support portion that supports the bearing portion, the connection fixing portion of the movable ring member can be easily accessed from the mounting hole of the cutter drive portion. Thereby, the work of fixing the movable ring member to the fixed partition wall can be performed more easily.

In the shield excavator according to the first aspect, preferably, the fixed partition wall surrounds the outer periphery of the movable ring member and includes a cylindrical cylindrical portion extending so as to project rearward in the central axis direction, and the movable ring member and the cylinder. Further provided with a seal arranged so as to be sandwiched in the radial direction with the portion, the connection fixing portion of the movable ring member is connected and fixed in the central axis direction with respect to the cylindrical portion when the bearing portion is removed. To. With this configuration, when the connection fixing portion of the movable ring member and the cylindrical portion of the fixed partition wall are connected and fixed, the movable ring different from the radial direction in which the seal is sandwiched between the movable ring member and the cylindrical portion. The movable ring member and the cylindrical portion can be connected and fixed in the direction of the central axis of the member. As a result, when the connection fixing portion of the movable ring member and the cylindrical portion of the fixed partition wall are connected and fixed, the seal arranged so as to be sandwiched in the radial direction between the movable ring member and the cylindrical portion is crushed and deformed. Since it is possible to suppress the movement, the movable ring member can be fixed to the fixed partition wall while maintaining the airtightness by the seal.

In a shield excavator having a structure in which the fixed partition wall includes a cylindrical portion, preferably, the connection fixing portion of the movable ring member is attached to the end portion on the bearing portion side in the central axis direction of the cylindrical portion when the bearing portion is removed. It is fixed. With this configuration, the connection fixing portion of the movable ring member can be fixed to the rear end portion of the cylindrical portion on the bearing portion side in the central axis direction, so that when the movable ring member is fixed to the fixed partition wall, it can be fixed. , The work can be performed from the rear of the cylindrical part. As a result, it is not necessary to avoid the cylindrical portion and perform the work, so that the work of fixing the movable ring member to the fixed partition wall can be performed more easily.

In this case, preferably, the connection fixing portion is provided at the end portion of the movable ring member on the bearing portion side. With this configuration, the connection fixing portion provided at the rear end on the bearing portion side in the central axis direction of the movable ring member can be fixed to the cylindrical portion, so that the movable ring member is fixed to the fixed partition wall. At that time, the work can be performed from the rear of the movable ring member. As a result, it is not necessary to avoid the movable ring member and perform the work, so that the work of fixing the movable ring member to the fixed partition wall can be performed more easily.

In a shield excavator having a structure in which the fixed partition wall includes a cylindrical portion, preferably, the connecting and fixing portions of the movable ring member are arranged at predetermined intervals with respect to the cylindrical portion in the central axis direction, and the bearing portion. When removing, a spacer is inserted between the connection fixing portion and the cylindrical portion, and the movable ring member is fixed to the cylindrical portion. With this configuration, even when the connection fixing portion of the movable ring member and the cylindrical portion are fastened and fixed, it is possible to suppress a large fluctuation in the distance between the movable ring member and the cylindrical portion in the central axis direction. , It is possible to suppress the change in the state of the seal arranged so as to be sandwiched in the radial direction between the movable ring member and the cylindrical portion. As a result, the movable ring member can be fixed to the fixed partition wall while maintaining the tightness of the seal more reliably.

The method of removing the bearing portion of the shield excavator in the second aspect of the present invention is a movable partition connected to the movable partition so as to extend rearward from the movable partition that rotates with the cutter head that rotates around the central axis and excavates the earth and sand. The ring member is connected and fixed to a fixed partition wall fixedly provided on the outer peripheral side with respect to the movable partition wall, and then the bearing portion that rotatably supports the movable ring member is removed from the movable ring member.

In the method of removing the bearing portion of the shield excavator according to the second aspect of the present invention, the work for removing the bearing portion can be easily performed by the above configuration as in the first aspect.

According to the present invention, as described above, the work for removing the bearing portion can be easily performed.

It is the figure which looked at the shield excavator by one Embodiment from the rear. It is a schematic vertical sectional view of the shield excavator along the line II-II of FIG. It is an enlarged view around the bearing part of the shield excavator according to one Embodiment. It is a figure for demonstrating the fixing work of the movable ring member of a shield excavator by one Embodiment. It is an enlarged view for demonstrating the fixing work of the movable ring member of a shield excavator according to one Embodiment. It is a figure for demonstrating the fixing of the movable ring member which looked at the shield excavator from the rear by one Embodiment. It is a figure which showed the spacer of the shield boring machine by one Embodiment. It is a figure for demonstrating the removal work of the bearing part of the shield excavator by one Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

The shield excavator 100 according to the embodiment of the present invention will be described with reference to FIGS. 1 to 8.

(Overall configuration of shield boring machine)
As shown in FIGS. 1 and 2, the shield excavator 100 includes a tubular body 10, a cutter head 20, a movable partition wall 30, a movable ring member 40, a bearing portion 50, a cutter drive portion 60, and the like. A support portion 70, a seal 80, and an earth removal device 90 are provided.

In FIGS. 1 and 2, a medium-diameter type shield boring machine 100 that employs a central support method as a support method for the cutter head 20 is illustrated. In the central support system, the cutter head 20 is attached to the rotationally driven annular movable ring member 40 by a movable partition wall 30 extending in the central axis A direction (X direction). The movable ring member 40 is rotatably supported by the bearing portion 50.

The body 10 of the shield excavator 100 is formed in a cylindrical shape extending in the front-rear direction (X direction). The body 10 is provided with a chamber 11 on the front side (X1 direction side) in the excavation direction. The front side of the body 10 is closed by the fixed partition wall 12 and the movable partition wall 30, and is separated from the rear side (X2 direction side) of the body 10. The chamber 11 is a space surrounded by the cutter head 20, the inner wall of the body 10, the movable partition wall 30, and the fixed partition wall 12. The fixed partition wall 12 is fixed to the inside of the body 10. Further, the fixed partition wall 12 is provided so as to extend inward from the body 10. Further, the fixed partition wall 12 is formed in an annular shape. Further, the fixed partition wall 12 is fixedly provided on the outer peripheral side with respect to the movable partition wall 30.

The body 10 is provided with a support portion mounting portion 13 for mounting the support portion 70. The support portion mounting portion 13 is arranged behind the fixed partition wall 12 (in the X2 direction). The support portion mounting portion 13 is fixed to the inside of the body 10. Further, the support portion mounting portion 13 is provided so as to extend inward from the body 10. Further, the support portion mounting portion 13 is formed in an annular shape.

The fixed partition wall 12 includes a cylindrical cylindrical portion 121 that surrounds the outer periphery of the movable ring member 40 and extends so as to project rearward in the central axis A direction (X2 direction).

The cutter head 20 is formed in a circular shape when viewed from the excavation direction (X direction), and is configured to rotate around the central axis A. The cutter head 20 is rotationally driven around the central axis A by applying a drive torque through the bearing portion 50, the movable ring member 40, and the movable partition wall 30 by the cutter drive unit 60. The cutter head 20 rotates around the central axis A to excavate earth and sand.

The cutter head 20 has an excavation tool 21 such as a cutter bit or a disc cutter which is an excavation blade on an excavation surface in front of the excavation direction. The excavated soil scraped by the cutter bit or the like enters the chamber 11 inside the cutter head 20. The excavated soil in the chamber 11 is conveyed to the inside of the body 10 through the fixed partition wall 12 by the soil discharging device 90, and is discharged to the outside of the tunnel. In the case of an earth pressure shield, the soil discharge device 90 is configured by a screw conveyor or the like, and in the case of a muddy water shield, it is composed of a pipe or the like that discharges excavated soil slurried by the muddy water sent into the chamber 11. .. The excavated soil in the chamber 11 generates mud pressure in the chamber 11 by controlling the amount of discharged soil by the soil discharging device 90.

The movable partition wall 30 has the shape of the side surface of the truncated cone. Further, the movable partition wall 30 supports the cutter head 20. Further, the movable partition wall 30 is configured to rotate together with the cutter head 20. One end (X1 direction side end) of the movable partition wall 30 is attached to the cutter head 20, and the other end (X2 direction side end) is attached to the movable ring member 40.

The movable partition wall 30 is formed in a substantially truncated cone-shaped cylinder extending so as to spread rearward (X2 direction) along the central axis A direction. Further, the movable partition wall 30 is provided with a flange-shaped annular mounting portion 30a extending inward in the radial direction from the outer peripheral portion on the rear side (X2 direction side). Further, a plurality of reinforcing ribs 31 extending radially in the radial direction are provided on the inner peripheral surface (surface on the X2 direction side) of the movable partition wall 30.

The movable ring member 40 is attached to the rear surface (the surface on the X2 direction side) of the annular attachment portion 30a of the movable partition wall 30. Further, the movable ring member 40 is provided so as to extend rearward from the movable partition wall 30. The movable ring member 40 is configured to rotate together with the cutter head 20 and the movable partition wall 30. The movable ring member 40 is provided with a flange-shaped partition wall mounting portion 40a on the front side (X1 direction side). Further, the movable ring member 40 is provided with a flange-shaped bearing mounting portion 40b on the rear side (X2 direction side).

In the movable ring member 40, a partition wall mounting portion 40a provided at one end (X1 direction side end) is attached to the annular mounting portion 30a of the movable partition wall 30, and is provided at the other end (X2 direction side end). The bearing mounting portion 40b is mounted on the outer ring side portion 50a (gear tooth side) of the bearing portion 50. That is, in the movable ring member 40, the partition wall mounting portion 40a is fastened and fixed to the annular mounting portion 30a of the movable partition wall 30 by a plurality of fastening members 42 (screw members). Further, in the movable ring member 40, the bearing mounting portion 40b is fastened and fixed to the outer ring side portion 50a of the bearing portion 50 by a plurality of fastening members 43 (screw members).

The bearing portion 50 rotatably supports the movable ring member 40. The bearing portion 50 includes an inner ring side portion 50b fixed to the support portion 70 and an outer ring side portion 50a that is rotatable with respect to the inner ring side portion 50b. Gear teeth for transmitting the drive of the cutter drive unit 60 are provided on the outer peripheral portion of the outer ring side portion 50a of the bearing portion 50. The gear teeth of the bearing portion 50 are meshed with the teeth of the gear 61 that transmits the rotation of the cutter drive portion 60.

The cutter drive unit 60 is configured to rotationally drive the cutter head 20. The cutter drive unit 60 is, for example, a hydraulic motor. Further, as shown in FIG. 1, a plurality (8) of cutter drive units 60 are provided. Specifically, four cutter drive units 60 are provided on the Y1 direction side and four on the Y2 direction side with the central portion interposed therebetween. Further, the plurality of cutter drive units 60 are controlled so as to be driven synchronously.

As shown in FIG. 2, the support portion 70 is configured to support the bearing portion 50 and the cutter drive portion 60. Further, the support portion 70 is formed in a plate shape extending in a substantially vertical direction (YZ direction) with respect to the central axis A. Further, the support portion 70 includes a mounting portion 71 to which the bearing portion 50 is mounted and a mounting hole 72 to which the cutter drive portion 60 is mounted. Further, the support portion 70 is fastened and fixed to the support portion mounting portion 13 by a plurality of fastening members 73. Further, the inner ring side portion 50b of the bearing portion 50 is fastened and fixed to the support portion 70 by a plurality of fastening members 74. Further, the cutter drive unit 60 is fastened and fixed to the support portion 70 by a plurality of fastening members 62.

The seal 80 is arranged so as to be sandwiched in the radial direction between the movable ring member 40 and the cylindrical portion 121. The seal 80 is configured to seal between the rotating portion (movable ring member 40) and the fixed portion (fixed partition wall 12) so that the earth and sand of the chamber 11 does not flow into the body 10. The seal 80 is provided in an annular shape on the outside of the movable ring member 40 and on the inside of the cylindrical portion 121. Further, the seal 80 has an annular shape extending in the central axis A direction.

Here, in the present embodiment, as shown in FIG. 3, the movable ring member 40 includes a connection fixing portion 41 which is connected and fixed to the fixing partition wall 12 when the bearing portion 50 is removed. Specifically, the connection fixing portion 41 of the movable ring member 40 is connected and fixed to the cylindrical portion 121 in the central axis A direction (X direction) when the bearing portion 50 is removed. Further, when the bearing portion 50 is removed, the connection fixing portion 41 of the movable ring member 40 is attached to the end portion on the bearing portion 50 side (end portion on the X2 direction side) in the central axis A direction (X direction) of the cylindrical portion 121. On the other hand, it is fixed. When the bearing portion 50 is removed, the connection fixing portion 41 of the movable ring member 40 is fastened and fixed to the cylindrical portion 121 of the fixing partition wall 12 by a plurality of fastening members 44 (see FIGS. 4 and 5). Further, the connection fixing portion 41 is provided so as to project toward the outer peripheral side of the bearing mounting portion 40b.

Further, the connection fixing portion 41 is provided at an end portion (end portion on the X2 direction side) of the movable ring member 40 on the bearing portion 50 side. Further, the connection fixing portion 41 of the movable ring member 40 is arranged at a predetermined interval L with respect to the cylindrical portion 121 in the central axis A direction (X direction). Then, when the bearing portion 50 is removed, a spacer 45 (see FIGS. 4 and 5) is inserted between the connection fixing portion 41 and the cylindrical portion 121, and the movable ring member 40 is fixed to the cylindrical portion 121. .. As shown in FIG. 5, the spacer 45 has a predetermined thickness t. However, t ≦ L. Further, as shown in FIG. 7, the spacer 45 is provided with a recess 451 that avoids the fastening member 44.

Further, as shown in FIG. 6, the connection fixing portion 41 of the movable ring member 40 overlaps with the mounting hole 72 of the support portion 70 when viewed in the central axis A direction (X direction) when the bearing portion 50 is removed. Is fixed to the fixed partition wall 12.

(How to remove the bearing of the shield tunnel boring machine)
Next, a method of removing the bearing portion 50 of the shield excavator 100 will be described.

The method of removing the shield excavator 100 is to move the movable ring member 40 connected to the movable partition wall 30 so as to extend rearward from the movable partition wall 30 that rotates together with the cutter head 20 that rotates around the central axis A to excavate earth and sand. It is connected to and fixed to a fixed partition wall 12 fixedly provided on the outer peripheral side with respect to the partition wall 30. After that, the bearing portion 50 that rotatably supports the movable ring member 40 is removed from the movable ring member 40.

Specifically, first, the rotation of the movable ring member 40 (cutter head 20) is stopped so that the connection fixing portion 41 of the movable ring member 40 is fastened and fixed to the cylindrical portion 121 of the fixed partition wall 12. .. Then, as shown in FIGS. 4 to 6, the cutter drive unit 60 is removed from the mounting hole 72 of the support unit 70. This makes it possible to easily access the connection fixing portion 41 from the mounting hole 72.

Next, the fastening member 44 is inserted into the connection fixing portion 41 and the cylindrical portion 121. Then, the spacer 45 is inserted between the connection fixing portion 41 and the cylindrical portion 121 so that the fastening member 44 fits into the recess 451 of the spacer 45. After that, the connection fixing portion 41 is fastened and fixed to the cylindrical portion 121 by the fastening member 44.

As a result, the cutter head 20 is fixed to the fixed partition wall 12 via the movable ring member 40. As a result, the posture of the cutter head 20 can be maintained even if the bearing portion 50 that rotatably supports the cutter head 20 is removed from the cutter head 20 (movable ring member 40).

Next, the fixing between the bearing portion 50 and the movable ring member 40 is released. Specifically, the plurality of fastening members 43 are pulled out, and the fastening is released. Further, the fixing between the support portion 70 and the support portion mounting portion 13 is released. Specifically, the plurality of fastening members 73 are pulled out, and the fastening is released. As a result, as shown in FIG. 8, the bearing portion 50 and the support portion 70 can be removed.

(Effect of this embodiment)
In this embodiment, the following effects can be obtained.

In the method of removing the shield excavator 100 and the bearing portion 50 in the present embodiment, as described above, the movable ring member 40 extending rearward (X2 direction) from the movable partition wall 30 is attached to the fixed partition wall 12 when the bearing portion 50 is removed. A connection fixing portion 41 to be connected and fixed is provided. As a result, when the bearing portion 50 is removed, the connection fixing portion 41 of the movable ring member 40 connected to the movable partition wall 30 so as to extend rearward from the movable partition wall 30 is connected to and fixed to the fixed partition wall 12. Can be done. As a result, the cutter head 20 and the movable partition wall 30 can be fixed to the fixed partition wall 12 via the movable ring member 40, so that it is not necessary to perform the fixing work while avoiding the movable ring member 40. As a result, the work for removing the bearing portion 50 can be easily performed. As a result, the bearing portion 50 can be easily removed in order to replace the bearing portion 50 or to remove the bearing portion 50 and use it in another shield excavator 100 while the cutter head 20 is in the earth and sand. ..

Further, in the present embodiment, as described above, the bearing portion 50 and the cutter drive portion 60 are supported, and a plate-shaped support portion 70 extending in a direction substantially perpendicular to the central axis A is provided. Further, when the bearing portion 50 is removed, the connection fixing portion 41 of the movable ring member 40 is fixed to the fixing partition wall 12 at a position overlapping the mounting hole 72 of the support portion 70 when viewed in the central axis A direction (X direction). .. As a result, by removing the cutter drive unit 60 from the support portion 70 that supports the bearing portion 50, the connection fixing portion 41 of the movable ring member 40 can be easily accessed from the mounting hole 72 of the cutter drive portion 60. As a result, the work of fixing the movable ring member 40 to the fixed partition wall 12 can be performed more easily.

Further, in the present embodiment, as described above, the fixed partition wall 12 includes a cylindrical cylindrical portion 121 that surrounds the outer circumference of the movable ring member 40 and extends so as to project rearward (X2 direction) in the central axis A direction. .. Further, a seal 80 arranged so as to be sandwiched in the radial direction is provided between the movable ring member 40 and the cylindrical portion 121. Further, when the bearing portion 50 is removed, the connection fixing portion 41 of the movable ring member 40 is connected and fixed to the cylindrical portion 121 in the central axis A direction (X direction). As a result, when the connection fixing portion 41 of the movable ring member 40 and the cylindrical portion 121 of the fixed partition wall 12 are connected and fixed, the radial direction in which the seal 80 is sandwiched between the movable ring member 40 and the cylindrical portion 121 is The movable ring member 40 and the cylindrical portion 121 can be connected and fixed in the direction of the central axis A of different movable ring members 40. As a result, when the connection fixing portion 41 of the movable ring member 40 and the cylindrical portion 121 of the fixed partition wall 12 are connected and fixed, they are arranged so as to be sandwiched in the radial direction between the movable ring member 40 and the cylindrical portion 121. Since it is possible to prevent the sealed seal 80 from being crushed and deformed, the movable ring member 40 can be fixed to the fixed partition wall 12 while maintaining the airtightness of the seal 80.

Further, in the present embodiment, as described above, when the bearing portion 50 is removed from the connection fixing portion 41 of the movable ring member 40, the bearing portion 50 side (X2 direction side) in the central axis A direction of the cylindrical portion 121 Fix to the end. As a result, the connection fixing portion 41 of the movable ring member 40 can be fixed to the rear end portion of the cylindrical portion 121 on the bearing portion 50 side in the central axis A direction, so that the movable ring member 40 is fixed to the fixed partition wall 12. When doing so, the work can be performed from the rear of the cylindrical portion 121. As a result, it is not necessary to avoid the cylindrical portion 121 for the work, so that the work of fixing the movable ring member 40 to the fixed partition wall 12 can be performed more easily.

Further, in the present embodiment, as described above, the connection fixing portion 41 is provided at the end portion of the movable ring member 40 on the bearing portion 50 side (X2 direction side). As a result, the connection fixing portion 41 provided at the rear end on the bearing portion side in the central axis A direction of the movable ring member 40 can be fixed to the cylindrical portion 121, so that the movable ring member 40 can be fixed to the fixed partition wall 12. When fixing, the work can be performed from the rear of the movable ring member 40. As a result, it is not necessary to avoid the movable ring member 40 and perform the work, so that the work of fixing the movable ring member 40 to the fixed partition wall 12 can be performed more easily.

Further, in the present embodiment, as described above, the connection fixing portion 41 of the movable ring member 40 is arranged at a predetermined interval L with respect to the cylindrical portion 121 in the central axis A direction (X direction). Further, when removing the bearing portion 50, a spacer 45 is inserted between the connection fixing portion 41 and the cylindrical portion 121 to fix the movable ring member 40 to the cylindrical portion 121. As a result, even when the connection fixing portion 41 of the movable ring member 40 and the cylindrical portion 121 are fastened and fixed, it is possible to suppress a large fluctuation in the distance between the movable ring member 40 and the cylindrical portion 121 in the central axis A direction. Therefore, it is possible to suppress the change in the state of the seal 80 arranged so as to be sandwiched in the radial direction between the movable ring member 40 and the cylindrical portion 121. As a result, the movable ring member 40 can be fixed to the fixed partition wall 12 while maintaining the airtightness of the seal 80 more reliably.

(Modification example)
It should be noted that the embodiments and modifications disclosed this time are exemplary in all respects and are not considered to be restrictive. The scope of the present invention is shown by the scope of claims rather than the description of the above-described embodiment, and further includes all modifications (modifications) within the meaning and scope equivalent to the scope of claims.

For example, in the above embodiment, the shield boring machine is a central support type shield boring machine, but the present invention is not limited to this. The shield excavator of the present invention may be applied to a shield excavator of various support methods such as a center shaft support system, an outer peripheral support system, and an intermediate support system other than the above support system.

Further, in the above embodiment, an example of a configuration in which the shield excavator is provided with eight cutter drive units is shown, but the present invention is not limited to this. In the present invention, the shield excavator may be provided with one cutter drive unit, or may be provided with a plurality of cutter drive units other than eight.

Further, in the above embodiment, an example of a configuration in which the bearing portion and the support portion that supports the bearing portion are connected and removed is shown, but the present invention is not limited to this. In the present invention, with the cutter head (movable ring member) fixed to the fixed partition wall, the support portion may be removed first, and then the bearing portion may be removed.

Further, in the above embodiment, an example of the configuration in which the movable partition wall is formed in the side surface shape of the truncated cone is shown, but the present invention is not limited to this. In the present invention, the movable partition wall may be formed in a disk shape at the rear end of the chamber.

12 Fixed bulkhead 20 Cutter head 30 Movable bulkhead 40 Movable ring member 41 Connection fixing part 45 Spacer 50 Bearing part 60 Cutter drive part 70 Support part 71 Mounting part 72 Mounting hole 80 Seal 100 Shield excavator 121 Cylindrical part A Center axis

Claims (7)

A cutter head that rotates around the central axis to excavate earth and sand,
A movable bulkhead that supports the cutter head and rotates with the cutter head,
A movable ring member connected to the movable partition wall so as to extend rearward from the movable partition wall,
A fixed partition wall fixedly provided on the outer peripheral side with respect to the movable partition wall,
A bearing portion that rotatably supports the movable ring member is provided.
The movable ring member is a shield excavator including a connection fixing portion that is connected and fixed to the fixed partition wall when the bearing portion is removed. A cutter drive unit that rotationally drives the cutter head,
A plate-like shape that includes a mounting portion to which the bearing portion is mounted and a mounting hole to which the cutter drive portion is mounted, supports the bearing portion and the cutter drive portion, and extends in a direction substantially perpendicular to the central axis. With a support part,
According to claim 1, the connection fixing portion of the movable ring member is fixed to the fixing partition wall at a position overlapping the mounting hole of the support portion when viewed in the central axis direction when the bearing portion is removed. The shield excavator described. The fixed partition wall includes a cylindrical cylindrical portion that surrounds the outer periphery of the movable ring member and extends so as to project rearward in the central axis direction.
Further provided with a seal arranged so as to be sandwiched in the radial direction between the movable ring member and the cylindrical portion.
The shield excavator according to claim 1 or 2, wherein the connection fixing portion of the movable ring member is connected and fixed to the cylindrical portion in the central axis direction when the bearing portion is removed. The shield excavation according to claim 3, wherein the connection fixing portion of the movable ring member is fixed to the end portion of the cylindrical portion on the bearing portion side in the central axis direction when the bearing portion is removed. Machine. The shield excavator according to claim 4, wherein the connection fixing portion is provided at an end portion of the movable ring member on the bearing portion side. The connection fixing portion of the movable ring member is arranged at a predetermined distance from the cylindrical portion in the central axis direction.
According to any one of claims 3 to 5, when the bearing portion is removed, a spacer is inserted between the connection fixing portion and the cylindrical portion to fix the movable ring member to the cylindrical portion. Described shield excavator. A movable ring member connected to the movable partition wall so as to extend rearward from the movable partition wall that rotates together with a cutter head that rotates around the central axis to excavate earth and sand is fixedly provided on the outer peripheral side with respect to the movable partition wall. Connect to the fixed bulkhead and fix it
After that, a method of removing the bearing portion of the shield excavator, in which the bearing portion that rotatably supports the movable ring member is removed from the movable ring member.

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