JP2001303894A - Bearing seal structure for cutter drum of shield machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing seal structure for a cutter drum of a shield machine, capable of heightening strength by simplifying the structure, reducing operating time to recover a seal function, and lessening a working load. SOLUTION: The first ring member 53 fitted with the first seal members 51 is mounted on the inner periphery part of an annular recessed part 24 housing the cutter drum 26 and formed in a partition wall 4. The first seal member moving mechanism 49 capable of moving the member 53 with the members 51 by a prescribed short distance backward in an axial direction is mounted in order to recover the seal function. The second ring member 61 fitted with the second seal members 59 is mounted on the outer periphery part of the cutter drum 26. The bearing seal structure is also provided with the second seal member moving mechanism 50 capable of moving the member 61 with members 59 by a prescribed short distance backward in the axial direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing seal structure for a cutter machine of a shield machine, and more particularly, to a structure for simplifying the structure and preventing earth and sand or muddy water from entering the machine body even when used for long distance excavation. TECHNICAL FIELD The present invention relates to a bearing seal structure for a cutter drum of a shield machine capable of preventing the occurrence of a problem.

[0002]

2. Description of the Related Art Shield tunneling machines are used for subways, water and sewage systems, tunnels for power cables and communication cables,
Shield tunnels are used for excavation. Normal shield excavators include a front body, a rear body, a cutter disk, a rotary drive mechanism for a cutter disk, a plurality of shield jacks, an earth removal facility, There is an erector and the like for lining the segment on the inner surface of the tunnel. According to this shield excavator, while generating excavation thrust through the segments covered by the plurality of shield jacks, the cutter disk is rotationally driven to excavate a face and excavate a predetermined length (for one ring). Each time, the segment is lined on the inner surface of the tunnel by an erector, and the tunnel is dug while repeating this.

[0003] A partition defining a chamber is provided on the rear side of the cutter disk, and a cutter drum connected to the cutter disk via a plurality of connecting members is rotatable in an annular concave portion formed in the partition. Is housed in
Equipped with a plurality of seal members for sealing the inner peripheral portion of the cutter drum and a plurality of seal members for sealing the outer peripheral portion of the cutter drum, and has a structure for preventing muddy water and earth and sand from entering the excavator body. I have.

When the excavation distance of the shield excavator is long, if the contact surface of each seal member with the seal lip is worn or the seal member is worn or damaged,
The inner and outer peripheries of the cutter drum cannot be sealed, and earth and sand and muddy water enter the excavator body from the chamber. In recent years, various types of bearing seal structures for cutter drums of shielded excavators that can prevent earth and sand or muddy water from entering the excavator body even when used for long-distance excavation have been proposed and put into practical use. Hei3-111360, Jitsuhei 6
No. 9111).

In the shield machine disclosed in Japanese Patent Publication No. 3-11360, two radially-first seal members for sealing an inner peripheral portion of a cutter drum are provided on an inner peripheral portion and an outer peripheral portion of a seal ring, respectively. A radially two-stage second seal member for sealing the outer peripheral portion of the cutter drum is provided on the inner peripheral portion and the outer peripheral portion of the seal ring, respectively. In the initial stage of excavation, the front end of each seal ring is fixed to the cutter drum with a sealing plate, and the inner seal portion of the first seal member and the outer seal member of the second seal member are used. Prevents earth and sand or muddy water from entering the excavator body.
At the stage where these seal members are worn, the fixing of each seal ring to the sealing plate is released, each seal ring is fixed to the partition wall with the sealing plate, and the earth and sand is inserted into the excavator body using the remaining two stages of sealing members. And muddy water from entering.

In the tunnel excavator disclosed in Japanese Utility Model Publication No. 6-9111, a plurality of first and second seal members for sealing an inner peripheral portion and an outer peripheral portion of a cutter drum, respectively, and a first sliding member which slides on a seal lip of each seal member. 1, a second seal sleeve, and an axial length in which the first seal sleeve is fixed to the inner peripheral wall of the annular recess, and the second seal sleeve is fixed to the inner peripheral portion of the cutter drum. And a plurality of attachment members having different sizes. During long excavation, when the contact surface of the seal sleeve with the seal lip is worn,
The position of the seal sleeve is moved in the axial direction by replacing the mounting members having different lengths, and the non-wearing portion of the seal sleeve is brought into contact with the seal lip. It has been empirically known that the contact surface (metal surface) with respect to the seal lip has a larger wear amount than the seal member.

[0007]

[Problems to be Solved by the Invention]
In the conventional device described in JP-A-360, the number of seal members is required for four stages, so that the number of parts is increased, the seal structure itself is complicated, and the manufacturing cost is increased. Only the front end of each seal ring is fixed to the cutter drum or partition wall with a sealing plate, so the rigidity of the seal ring is low,
In addition, since the seal ring and the two-stage seal member must be disposed in the narrow annular gap, each seal member has a thin structure. Therefore, there is a problem that the strength of the bearing seal structure is reduced. Further, since the seal member can be switched only substantially once, it is not suitable for excavating over a long distance. Furthermore, when the contact surface of the cutter drum and the wall of the annular recess with the seal member is worn, the contact surface must be repaired or replaced when reused.

In the prior art described in Japanese Utility Model Publication No. 6-9111, it is necessary to disassemble the cutter drum in order to relocate the mounting sleeves having different lengths to shift the position of the seal sleeve in the axial direction. Therefore, the work load is large, the work time is long, and the stop time during excavation is long. When a plurality of seal members are worn or damaged, the seal members must be replaced one by one, which lowers the work efficiency. SUMMARY OF THE INVENTION It is an object of the present invention to provide a bearing seal structure for a cutter drum of a shield machine in which the structure is simplified and the strength is enhanced, the working time for restoring the sealing function is reduced, and the working load is reduced. And so on.

[0009]

According to a first aspect of the present invention, there is provided a bearing seal structure for a cutter drum of a shield machine, wherein a cutter disk, a partition wall defining a chamber behind the cutter disk, and a cutter drum formed in the partition wall are accommodated. In a shield machine including an annular concave portion, a plurality of first seal members sealing an inner peripheral portion of the cutter drum, and a plurality of second seal members sealing an outer peripheral portion of the cutter drum, an inner peripheral portion of the annular concave portion A first ring member having a plurality of first seal members mounted thereon, and a first seal member relocated along with the first seal member for a predetermined small distance axially rearward in order to restore the sealing function. A mechanism is provided.

When the shield machine is used for long-distance excavation, the amount of wear of the inner peripheral portion of the cutter drum that slides on the first seal member during excavation becomes more than a predetermined value (for example, about 5 mm or more) in the radial direction. At this stage, the first ring member is moved rearward in the axial direction by a predetermined small distance together with the first seal member by the first seal member transfer mechanism. Then the first
The sealing function of the sealing member is restored, and it is possible to prevent earth and sand and muddy water from entering the excavator body from the inner peripheral portion of the cutter drum. After the excavation is resumed, when the amount of wear on the inner peripheral portion of the cutter drum that slides on the first seal member has reached a predetermined value or more, a relocation operation is performed by the first seal member relocation mechanism in the same manner as described above. If necessary, repeat this relocation work.

In the plurality of second seal members, for example, a seal member transfer mechanism substantially similar to the first seal member transfer mechanism is provided, and the amount of wear of the outer peripheral wall of the partition wall that slides on the second seal member is reduced. By performing the relocation operation in parallel with the relocation operation at the stage where the predetermined value or more is reached, the sealing function of the entire bearing seal in the cutter drum can be restored.

According to a second aspect of the present invention, there is provided a bearing seal structure for a cutter machine of a shield machine according to the first aspect, further comprising a second ring member provided with a plurality of second seal members on an outer peripheral portion of the cutter drum. In order to recover the function, a second seal member transfer mechanism capable of transferring the second ring member together with the plurality of second seal members rearward in the axial direction by a predetermined small distance is provided. Since the second seal member transfer mechanism has substantially the same operation as the first seal member transfer mechanism of the first aspect at the outer peripheral portion of the cutter drum, it has substantially the same operation as the first aspect.

According to a third aspect of the present invention, in the shield excavator bearing seal structure for a cutter drum according to the first or second aspect of the present invention, the partition has an inner peripheral wall forming an inner peripheral portion of the annular concave portion and an outer peripheral portion of the annular concave portion. An outer peripheral wall portion to be formed, the first ring member has a flange portion fixed to a front end thereof and facing a front end of the inner peripheral wall portion, and the first seal member transfer mechanism includes a first ring member having a first ring member. It has a plurality of bolt members for fixing the flange portion to the front end of the inner peripheral wall portion via a spacer.

In the initial stage of excavation, the flange portion is
The inner peripheral wall is fixed to the front end of the inner peripheral wall with a bolt member via a plurality of overlapped spacers. During the excavation, the amount of wear of the inner peripheral portion of the cutter drum that is in sliding contact with the first seal member is equal to or more than a predetermined value. Once the bolts are reached, remove the bolt member once and
If only the spacers are detached and fixed again with the bolt member, the first ring member can be moved rearward in the axial direction by a predetermined small distance together with the first seal member. Can be repeated.

According to a fourth aspect of the present invention, the cutter drum is connected to the cutter disk via a plurality of connecting members, and each of the connecting members is connected to the cutter drum. A plurality of bolt members fixed to the front end of the second ring member and extending forward through the flange plate; and
A plurality of nut members screwed to the bolt members and rotatably mounted on the flange plate are provided.

In the initial stage of the excavation, for example, the front end of the second ring member is brought into contact with the flange plate of the cutter drum, and during the excavation, the amount of wear on the outer peripheral wall of the partition wall that slides against the second seal member is determined. When the plurality of nut members are rotated by a predetermined pitch at the stage where the value reaches the value or more, the second ring member can be moved rearward in the axial direction by a predetermined small distance together with the second seal member and the plurality of bolt members. Second
The seal function at the outer peripheral portion of the cutter drum can be restored by the seal member transfer mechanism.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. In the present embodiment, the present invention is applied to a bearing seal structure for a cutter drum connected to a cutter disk of a shield machine. First, the overall configuration of the shield machine will be schematically described, and then the bearing seal structure for the cutter drum of the shield machine will be described. The excavation direction is defined as the front, and the left and right toward the front is defined as left and right.

As shown in FIGS. 1 to 3, the shield machine 1 includes a cutter disk 2 and a chamber 3 on its rear side.
, A cylindrical body member 5, a rotary drive mechanism 6 for the cutter disk 2, a plurality of shield jacks 7 for generating excavating thrust, and a segment S on the inner surface of the excavated tunnel. It includes an erector 8 to be worked, a perfect circle holding device 9, an earth discharging facility 10 for discharging the excavated earth and sand, and the like.

The cutter disk 2 will be described.
As shown in FIGS. 1 and 2, the cutter disk 2 includes a center frame 11, a plurality of cutter spokes 12 and 13 extending radially from the center frame 11, a ring frame 14, and an outer periphery having the same diameter as the trunk member 5. A ring 15;
A copy cutter 16 provided on two of the plurality of cutter spokes 13 and capable of advancing to the outer peripheral side of the outer peripheral ring 15; a plurality of roller cutters 17 provided on the other cutter spokes 12; , 13 are provided with a number of cutter bits 18 and the like.

The body member 5 has a partition wall 4, support walls 19 and 20,
The annular webs 21 and 22 and the plurality of brackets 23 are provided. The partition 4 is provided inside the vicinity of the front end of the body member 5 to define the chamber 3, and the partition 4 has an annular recess 24 formed therein. An annular cutter drum 26 is connected to the back surface of the cutter disk 2 via a plurality of connecting members 25, and the cutter drum 26 is housed in the annular recess 24 of the partition wall 4 and is rotatably supported. In the vicinity of the center of the rear surface of the cutter disk 2, a rotary joint 27 that inserts the partition wall 4 is supported, and supplies the hydraulic pressure from the hydraulic supply source to the copy cutter 16 or from the humidifier supply source to the humidifier nozzle 28. Supply mud. A stirring blade 29 for stirring earth and sand in the chamber 3 is fixed to an outer peripheral wall of each connecting member 25.

The partition 4 will be described. The partition 4 includes a central wall portion 30, an inner peripheral wall portion 31 forming an inner peripheral portion of the annular concave portion 24, an outer peripheral wall portion 32 forming an outer peripheral portion of the annular concave portion 24,
It has a support wall portion 33 and the like welded to the body member 5. In addition, a reinforcement frame 34, a motor support frame 35, and the like are joined. Describing the rotation drive mechanism 6, a ring gear 36 is fixed to the rear end of the cutter drum 26, and a plurality of cutter drive motors 37 are provided on the rear side of the partition wall 4 via a motor support frame 35. The pinion at the tip of the output shaft of each cutter drive motor 37 is meshed with the ring gear 36, and the cutter disk 2 is driven to rotate forward and backward by the plurality of cutter drive motors 37.

As shown in FIGS. 1 to 3, a plurality of tail grout seals 38 are provided at the rear end of the body member 5 to prevent earth and sand from entering the shield machine 1. A rear work deck 39 is provided inside the body member 5 near the tail grout seal 38,
The rear work deck 39 is provided with a perfect circle holding device 9 for keeping the segment S in a perfect circle.

The shield jack 7 will be described.
A plurality of shield jacks 7 are arranged rearward at appropriate intervals in the circumferential direction in the vicinity of the center in the axial direction inside the body member 5, and the jack bodies of the shield jacks 7 are fixed to the partition wall 4, and It is supported by the annular webs 21 and 22 in a penetrating manner. A spreader 41 is pin-connected to the tip of the rod of each shield jack 7 via an eccentric fitting 40. The rod of each shield jack 7 is extended, and the spreader 41 is brought into contact with the front end of the segment S lining the inner surface of the tunnel to press it, thereby generating a digging thrust.

The erector 8 will be described. The erector 8 includes a rotating drum 42, an
A plurality of brackets 23 are provided with support rollers 45, respectively, and the rotating drum 42 is rotatably supported by the plurality of support rollers 45. Each time one ring is excavated in the tunnel, the segment S is assembled by the erector 8 over the entire periphery of the tunnel wall of one ring. Discharge equipment 1
To explain 0, the earth discharging facility 10 includes a screw conveyor 46, a hopper 47, and the like. The screw conveyor 46 rotationally drives the auger 48, a pair of hydraulic cylinders for driving the auger 48 forward and backward, and the auger 48. Motor and an opening / closing gate for discharging earth and sand (both not shown).

Next, the bearing seal structure for the cutter drum will be described. As shown in FIGS. 1 and 4, the bearing seal structure for a cutter drum has a first seal member transfer mechanism 49 and a second seal member transfer mechanism 50 for restoring the sealing function. The first seal member transfer mechanism 49 will be described. As shown in FIGS. 4 to 6, a plurality of first seal members 51 and an annular seal pressing member 52 are alternately mounted on the inner peripheral portion of the annular concave portion 24. The first ring member 53
Is provided, and the first ring member 53 is
In addition, it is configured such that it can be relocated a predetermined small distance rearward in the axial direction together with the seal pressing member 52. The first seal member 5
Grease 54 is filled between the first and first seal pressing members 52 and the inner peripheral portion of the cutter drum 26.

The first ring member 53 has a flange 55 fixed to the front end thereof and opposed to the front end of the inner peripheral wall 31. The first seal member transfer mechanism 49 uses the flange 55 as a plurality of spacers. A plurality of bolt members 57 are provided at appropriate intervals in the circumferential direction and fixed to the front end of the inner peripheral wall portion 31 via 56. In the initial stage of excavation, excavation is carried out with a plurality of spacers 56 provided, and in the course of excavation, the amount of wear of the inner peripheral portion of the cutter drum 26 that comes into sliding contact with the first seal member 51 is greater than or equal to a predetermined value in the radial direction. At this stage, one spacer 56 is removed, and the first ring member 53 is moved rearward in the axial direction by a predetermined small distance together with the first seal member 51. Thereafter, this transfer operation is repeated. Reference numeral 58 indicates a diagonal member for reinforcement.

The second seal member transfer mechanism 50 will be described. As shown in FIGS. 4, 7, and 8, a plurality of second seal members 59 and an annular seal pressing member are provided on the outer peripheral portion of the cutter drum 26. A second ring member 61 on which the second ring members 60 are alternately provided is provided, and the second ring member 61 can be moved rearward in the axial direction by a predetermined small distance together with the second seal member 59 and the seal pressing member 60. The grease 62 is filled between the second seal member 59 and the seal pressing member 60 and the outer peripheral wall of the partition wall 4.

Each of the connecting members 25 includes a cutter drum 26.
The second seal member transfer mechanism 50 has a plurality of bolt members 64 and a plurality of nut members 65 screwed to the bolt members 64, respectively. That is, a plurality of bolt members 64 are fixed to the front end of the second ring member 61 in the circumferential direction by screwing and welding,
Each bolt member 64 is configured to extend forward through the flange plate 63. Each nut member 65 includes a nut portion 65a at the front end, and a cylindrical portion 6 connected to the nut portion 65a.
5b, a flange portion 65c externally fitted and fixed to the rear end of the cylindrical portion 65b.
The nut member 65a and the flange portion 65c sandwich the flange plate 63 so as to be rotatable, and the bolt member 64 is screwed thereto.

Next, the operation of the above-described bearing seal structure for a cutter drum will be described. Shield machine 1
Is used for excavation over a long distance, the first seal member transfer mechanism 49 is provided when the amount of wear of the inner peripheral portion of the cutter drum 26 that comes into sliding contact with the first seal member 51 during the excavation reaches a predetermined value or more in the radial direction. Accordingly, the first ring member 53 is moved rearward in the axial direction by a predetermined small distance together with the first seal member 51 and the seal pressing member 52. That is, one spacer 56 of the plurality of spacers 56 is removed from each bolt member 57, and the first ring member 53 is moved rearward by the thickness of one spacer 56.

Then, the sealing function of the first sealing member 51 is restored, and it is possible to prevent earth and sand or muddy water from entering the excavator body from the inner peripheral portion of the cutter drum 26. At the stage where the amount of wear of the inner peripheral portion of the cutter drum 26 that comes into sliding contact with the first seal member 51 after the restart of the excavation has reached the predetermined value or more, one spacer 56 is removed from each bolt member 57 in the same manner as described above. The first ring member 53 is moved rearward by the thickness of one spacer 56 to restore the sealing function. In the following, if the excavation distance becomes longer, this relocation operation is repeated to recover the sealing function.

In the second seal member 59, as shown in FIGS. 7 and 8, the front end of the second ring member 61 is brought into contact with the flange plate 63 of the connecting member 25 in the initial stage of excavation. When the nut portions 65a of the plurality of nut members 65 are synchronously rotated by a predetermined pitch when the amount of wear of the outer peripheral wall portion 32 of the partition wall 4 that comes into sliding contact with the second seal member 59 reaches or exceeds the predetermined value, the second ring The member 61 is
The seal member 59 and the plurality of bolt members 64 can be moved rearward by a predetermined small distance in the axial direction rearward, and the second seal member transfer mechanism 50 can recover the sealing function at the outer peripheral portion of the cutter drum 26. In the following, if the excavation distance becomes long, this relocation operation is repeated to recover the sealing function.

According to the bearing seal structure for the cutter drum described above, the first seal member transfer mechanism 49 moves the first ring member 53 together with the first seal member 51 rearward in the axial direction to recover the sealing function. As a result, the structure is simplified, and it is not necessary to dismantle the cutter drum 26 when the first ring member 53 is relocated, so that the work load can be reduced. Moreover, the first ring member 53 itself serves as a strength member, which can increase the strength. Since the first ring member 53 is relocated by a predetermined small distance, the number of relocations can be increased, so that the total life of the sealing function can be extended and the excavation distance can be remarkably extended.

Further, the seal function of the outer peripheral portion of the cutter drum 26 is restored by the second seal member transfer mechanism 50, and the inner seal portion of the cutter drum 26 is sealed by the first seal member transfer mechanism 49 almost in parallel with this. Since the function is restored, the sealing function of the entire bearing seal in the cutter drum 26 can be restored. Also, the second
When the ring member 61 is relocated, there is no need to dismantle the cutter drum 26, and the work load can be reduced. Also, the first ring member 53 and the second ring member 61
The first seal member 51 and the second seal member 59 can be exchanged by pulling the first seal member 51 toward the chamber 4.
At this time, the flange plate 63 is to be removed.

Next, a modified embodiment in which this embodiment is partially modified will be described. 1) The shield machine may be provided with only one of the first seal member transfer mechanism and the second seal member transfer mechanism. 2) Spacers 5 to be superimposed in the initial stage of excavation
It is also possible to increase the number of sheets 6 from that of the embodiment. In this case, each bolt member 57 to be fixed must be long. In addition, without departing from the spirit of the present invention, it is possible to implement the above-described embodiment with various modifications.

[0035]

According to the first aspect of the invention, the first ring member can be moved rearward in the axial direction together with the first seal member by the first seal member transfer mechanism, so that the sealing function can be restored. Moreover, the structure is simplified, and the first
It is not necessary to dismantle the cutter drum when transferring the ring member, and the work load can be reduced. Moreover, the ring member itself serves as a strength member, which can increase the strength. Since the first ring member is relocated a predetermined small distance, the number of relocations can be increased, so that the life of the sealing function can be extended and the excavation distance can be significantly extended.

According to the second aspect of the present invention, the seal function of the outer peripheral portion of the cutter drum is restored by the second seal member transfer mechanism, and the inner peripheral surface of the cutter drum is substantially paralleled by the first seal member transfer mechanism. Since the sealing function of the section is restored, the sealing function of the entire bearing seal in the cutter drum can be restored. Other Claim 1
It has the same effect as.

According to the third aspect of the present invention, in the initial stage of excavation, if the flange portion is fixed to the front end of the inner peripheral wall portion via a plurality of stacked spacers with a bolt member, the spacer can be replaced with a spacer. Since a series of relocation operations can be repeated by the number of sheets, and the number of relocations can be increased,
The service life of the sealing function can be extended, and the excavation distance can be significantly extended. The other effects are the same as those of the first or second aspect.

According to the fourth aspect of the present invention, for example, the front end of the second ring member is brought into contact with the flange plate of the cutter drum, and the amount of wear on the outer peripheral wall of the partition wall that slides on the second seal member is reduced to a predetermined value. When the plurality of nut members are rotated by a predetermined pitch at the stage reaching the above, the second ring member can be moved rearward in the axial direction by a predetermined small distance together with the second seal member and the plurality of bolt members. The seal function at the outer peripheral portion of the cutter drum can be restored by the two seal member transfer mechanism. The other effects are the same as those of the third aspect.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a shield machine according to an embodiment of the present invention.

FIG. 2 is a front view of a cutter disk.

FIG. 3 is a longitudinal sectional view showing an erector, a perfect circle holding device, and the like.

FIG. 4 is a longitudinal sectional view of a main part of a bearing seal structure for a cutter drum.

FIG. 5 is an enlarged sectional view of the first seal member transfer mechanism before the first ring member is transferred.

FIG. 6 is a diagram corresponding to FIG. 5 after the first ring member is relocated.

FIG. 7 is an enlarged sectional view of the second seal member transfer mechanism before the transfer of the second ring member.

FIG. 8 is a view corresponding to FIG. 7 after the second ring member is relocated.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shield excavator 2 Cutter disk 3 Chamber 4 Partition wall 24 Annular recess 25 Connecting member 31 Inner peripheral wall part 32 Outer peripheral wall part 26 Cutter drum 49 1st seal member transfer mechanism 50 2nd seal member transfer mechanism 51 1st seal member 53 1st Ring member 55 Flange portion 56 Spacer 57 Bolt member 59 Second seal member 61 Second ring member 63 Flange plate 64 Bolt member 65 Nut member

 ──────────────────────────────────────────────────続 き Continued on front page (72) Inventor Kenichi Oride 8 Harima-machi, Harima-cho, Kako-gun, Hyogo Inside Harima Plant of Kawasaki Heavy Industries, Ltd. F term in Kawasaki Heavy Industries, Ltd. Harima Plant (reference) 2D054 AD11 BB02 BB10 3J006 AE15 AE37 AE51 3J043 AA16 BA08 CA02 DA09 DA10

Claims (4)

[Claims] 1. A cutter disk, a partition wall defining a chamber on a rear side thereof, an annular recess formed in the partition wall for receiving a cutter drum, a plurality of first seal members for sealing an inner peripheral portion of the cutter drum, and In a shield machine comprising a plurality of second seal members for sealing an outer peripheral portion of a cutter drum, a first ring member provided with a plurality of first seal members is provided on an inner peripheral portion of the annular concave portion, and a sealing function is provided. The first ring member can be relocated a predetermined small distance rearward in the axial direction together with the first seal member to recover the first ring member.
A bearing seal structure for a cutter drum of a shield machine, wherein a seal member transfer mechanism is provided. 2. A second ring member having a plurality of second seal members attached to an outer peripheral portion of the cutter drum, and the second ring member is axially mounted together with the plurality of second seal members in order to restore a sealing function. The second that can be moved a predetermined small distance backward
2. A seal member transfer mechanism is provided.
3. A bearing seal structure for a cutter drum of a shield machine described in (1). 3. The partition has an inner peripheral wall forming an inner peripheral part of the annular concave part and an outer peripheral wall part forming an outer peripheral part of the annular concave part, and the first ring member is fixed to a front end part thereof and has an inner peripheral part. The first seal member transfer mechanism has a plurality of bolt members for fixing the flange portion of the first ring member to the front end of the inner peripheral wall portion via a spacer, the flange portion facing the front end of the peripheral wall portion. The bearing seal structure for a cutter drum of a shield machine according to claim 1 or 2, wherein: 4. The cutter drum is connected to a cutter disk via a plurality of connection members, each of the connection members has a flange plate fixed to a front end of the cutter drum, and the first seal member transfer mechanism includes: A plurality of bolt members fixed to the front end of the second ring member and extending forward through the flange plate; and a plurality of nut members screwed to the bolt members and rotatably mounted on the flange plate, respectively. The bearing seal structure for a cutter drum of a shield machine according to claim 3, further comprising: