JP2788603B2 - Cutter disk device of underground joining shield machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground joint seal for concentrically joining two shield excavators machined excavating tunnels having greatly different diameters in the ground.
The present invention relates to a cutter disk device of a disk drive.

[0002]

2. Description of the Related Art In recent years, the demand for so-called subways, underground passages, and the like, in which railways, roads, and the like are provided in a stratum, has been increasing. Demand for new water, sewage, electricity, telephone lines, etc. is also increasing. Especially in urban development, new construction of sewers, electricity, telephone lines, etc. is rapidly increasing. A shield machine is frequently used as a machine for excavating a tunnel for providing a tunnel. In the tunnel formation by the shield machine, since the shield machine has limitations in the excavable distance and the construction period, a plurality of shafts are provided, and the tunnel is excavated between the shafts to form a continuous tunnel.

On the other hand, even when tunnels are excavated with this shield machine, for example, in the above-mentioned sewerage work, a small-diameter so-called branch pipe is provided on the upstream side, and a large-diameter so-called main pipe is provided on the downstream side. May form a continuous sewer by connecting
In the construction of a telephone line or the like, a continuous wiring path may be formed by providing a so-called main pipe having a large diameter at a supply source and providing a so-called branch pipe having a small diameter at a demand destination and connecting them. Therefore, there is a demand for providing tunnels having different diameters, that is, so-called different diameter tunnels, for providing such sewers and wiring paths.

[0004] However, as described above, tunnel formation by a shield machine requires the provision of a plurality of shafts at the junction, so that if a site is to be secured, a large amount of expense is required to secure the site, and moreover, that site is required. Construction of a shaft and excavation by each shield machine requires a very long construction period and cost. In addition, when installing a tunnel on the sea floor, if the upper part of the junction is underwater, large-scale ground improvement will be performed and the ground will be hardened and the joining work will be performed, requiring a very long construction period and a large amount of cost. Become.

[0005] For this reason, an underground joining method has been developed as a method capable of forming a tunnel in a short period without requiring many shafts.

As a prior art of such an underground joining method, there is an invention described in Japanese Patent Application Laid-Open No. 63-47499. In this invention, two shield machines having the same diameter are opposed to each other while facing a tunnel joint. It is designed to excavate so as to face each other at the joint, inject a solidifying agent near the joint of both shield machines, then disassemble the cutter disk etc. and join the tunnel, and use a shield machine of the same diameter. It can be applied only when joining.

As another joining method of a shield machine, there is an invention described in Japanese Patent Application Laid-Open No. 5-248170. This invention also joins two shield machines of the same diameter.
Reasonable joining is not possible with shield machines of widely different diameters which are the objects of the invention according to this application.

On the other hand, as a prior art of an underground joining method for tunnels having greatly different diameters, there is an invention described in Japanese Patent Publication No. 6-6865. This invention relates to docking of two large-diameter and small-diameter shield machines. The moving outer shell provided in front of the large-diameter shield machine at the point was moved so as to be located on the outer periphery of the small-diameter shield machine, and the space between the movable outer shell and the outer shell of the small-diameter shield machine was solidified by freezing or injection of a chemical solution. Later, the shield machine was dismantled.

[0009] However, the underground joining method for tunnels having different diameters is a method of improving the ground by freezing or injecting a chemical solution at the joint, and also a mortar column by the injection method. There is also a method of hitting pillars,
All of these construction methods require large-scale auxiliary construction methods to improve the ground so that the groundwater does not pass, and require a lot of construction cost and construction period. Also, in this case, since many areas are frozen or improved ground, freezing may cause expansion of frozen soil during freezing and ground subsidence during thawing, etc. Requires chemical injection. Furthermore, in the case of the construction method in which the joint is sealed only by freezing, it is difficult to manage the frozen soil during the dismantling work because the frozen insulation is thawed due to the melting and insulation of the dismantled part generated during the dismantling work of the shield machine after freezing and water leakage occurs. There is a problem, and the conventional method requires a lot of construction cost and time to excavate and connect underground tunnels of different diameters.

In view of the above problems, the invention according to this application has
Providing a cutter disk device of the underground junction shield machine capable of reducing the construction cost by shortening the work period perform waterproofing of the tunnel junction mechanical without the need for auxiliary construction method to ground the junction and purpose.

[0011]

In order to achieve the above object, a cutter disk device for an underground joining shield machine according to claim 1 comprises a large-diameter receiving-side shield machine and a small-diameter penetrating-side shield machine. In the cutter disk device of the receiving-side shield machine in the underground bonding shield method of joining concentrically inside, the disk frame of the cutter disk device is formed to have a smaller diameter than the skin plate inner diameter of the receiving-side shield machine. Provide an outer peripheral cutter around the device that can excavate to the outer diameter of the receiving side shield machine ,
A support is provided at the base end of the outer peripheral cutter, and the support is supported.
A support shaft to be held is provided on the disc frame, and the support shaft is rotated.
A drive for rotating the base end of the outer peripheral cutter about the center of movement.
The moving means is provided on the disk frame so that the outer peripheral cutter can be freely protruded / stored.

According to a second aspect of the present invention, there is provided a cutter disk device for an underground joining shield machine, wherein the rotation of the outer peripheral cutter is suppressed in a state where the outer peripheral cutter is protruded in the cutter disk device of the first aspect. Is provided on the disk frame.

[0013]

SUMMARY OF According to the cutter disk apparatus of the underground junction shield machine according to claim 1, the cutter disk device around the cutter disk with a diameter smaller than the skin plate inner diameter of the receiving side shield machine, the proximal end of the outer cutter Section
Support the girder support with the support shaft provided on the disc frame.
Rotate the base end of the outer cutter by the driving means.
For example, the outer peripheral cutter is
-Can be projected or stored from around the disk drive
When the outer peripheral cutter is protruded , the outer peripheral cutter becomes a cutter disk device capable of excavating to the outer diameter of the receiving-side shield machine, and when the outer peripheral cutter is stored in the cutter disk device, the cutter disk device is moved to the receiving side. The cutter disk device of the receiving-side shield machine in the underground joint shield machine that can be smaller in diameter than the skin plate inner diameter of the shield machine.

According to the cutter disk drive underground junction shield machine according to claim 2, it is possible to obtain the effect of the first aspect of the cutter disk device, is protruded to the outer circumferential cutter by Mawaritome means provided on the disc frame Rotation can be suppressed in the state.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the invention according to the present application will be described below with reference to the drawings. FIG. 1 is a diagram showing a cutter disk portion of the underground joining shield machine in the first embodiment,
(a) is a front view, (b) is an AA cross-sectional view. FIG.
(a), (b), (c) is a process diagram showing an underground joining shield method using the shield machine shown in FIG. 1, and FIG. 3 is a sectional view showing a tube seal at the underground joining portion.

As shown in the figure, the skin plate P of the receiving shield machine B1 for excavating the large diameter tunnel is
It has an outside diameter that forms the large diameter tunnel, and has an inside diameter that allows the penetration side shield machine S (see FIG. 2) that excavates the small diameter tunnel to be joined with the large diameter tunnel to penetrate. The inner diameter is smaller than the outer diameter of the penetrating-side shield machine S, and is formed to be substantially the same diameter. Also,
A tube seal 1 is provided at an inner peripheral end of the skin plate P.

This tube seal 1 is provided over the entire periphery of the inner peripheral end of the skin plate P, as shown in the sectional view of the joint shown in FIG. It is provided in Pa. And
The tube seal 1 can be sealed by applying a fluid pressure such as pneumatic pressure, water pressure, or hydraulic pressure from a location (not shown) to the inside thereof.
Is arranged so as to swell, and is housed in the skin plate P and has the same surface as the inner peripheral surface of the skin plate P. In this embodiment, as shown in FIG. Is provided with an inner peripheral ring 2a inside thereof.

Further, inside the skin plate P,
The shield machine structure 2 is provided so as to be relatively movable in the axial direction of the shield machine.
Is configured to be able to retreat while sliding on the inner surface of the skin plate P by driving means (not shown).

In this embodiment, the inner peripheral ring 2a for protecting the surface of the tube seal 1 during normal excavation.
However, the surface of the tube seal 1 may be tightly protected by the shield machine structure 2.

Further, although not shown, the front end of the skin plate P, the body radially outer surface portion of the attachment soil penetration side shield machine S when penetrating the penetrating side shield machine S in the receiving side shield machine B ₁ There are provided a plurality of cleaning nozzles for cleaning the nozzles, and the cleaning nozzles are connected to a cleaning device provided on the shield machine structure 2 side.

[0021] Then, the cutter disk apparatuses D ₁ is provided in front of the shield machine structure 2. Disk frame 3 of the cutting disk apparatuses D ₁ has an outer diameter which is smaller in diameter than the inner diameter of the skin plate P, skin plate P to the disc frame 3
Is provided with an outer peripheral cutter 4 capable of excavating up to the outer diameter of. In this embodiment, although a plurality of provided around the cutter disk apparatuses D ₁ by providing the outer peripheral cutter 4 in the disk frame 3, the number may be suitably determined by the shield machine sizes and excavating the ground, and the like.

The outer peripheral cutter 4 is provided so as to be able to protrude / retract from the periphery of the cutter disk device D _{1. In} the first embodiment, the cutter disk device D _{1 is provided.}
Of the frame member 3a of the disc frame 3 from the side portion of the disk frame 3 so as to protrude or extend therefrom. The configuration in which the outer peripheral cutter 4 is protruded or stored is constituted by a supporting portion 5 provided on the outer peripheral cutter base end portion 4a.
Is rotatably supported by a support shaft 6 provided on a frame member 3a of the disk frame 3, and an arm member 7 is provided on the support portion 5, and the base member 8a is attached to the arm member 7 on the frame member 3a. It is rotated by a tilting jack 8 which is a driving means supported by a shaft. The tilting jack 8 serving as a driving means is preferably a hydraulic cylinder such as a hydraulic cylinder or a pneumatic cylinder because of its simple configuration.

On the other hand, since the outer peripheral cutter 4 functions as a normal excavating cutter for excavating up to the outer diameter of the skin plate P in a protruded state, it must always maintain the protruding state against the excavating force. . Therefore, in this embodiment, a detent pin 9 as detent means for suppressing the rotation of the outer peripheral cutter 4 is provided. The detent pin 9 is configured to be extendable and retractable to the rear side of the outer peripheral cutter 4 by a pin telescopic jack 10 provided on the disk frame 3.
It is configured to prevent rotation by being inserted into a locking hole 4b provided on the back surface of the. If this pin expansion / contraction jack 10 is constituted by a hydraulic drive, the expansion / contraction state can be easily maintained by interrupting the hydraulic circuit.
Simple and preferable in structure. In a state where the outer peripheral cutter 4 is rotated and protruded, one side surface of the outer peripheral cutter 4 is in contact with the frame member 3a, so that the rotation inhibiting effect is also exerted on this surface.

According to the receiving side shield machine B ₁ of the ground bonding shield method of the first embodiment constructed as described above, FIG. 1 and FIG. 2 (a), (b) , as shown in (c) Then, underground joining is performed.

[0025] That is, as shown in FIG. 1, drilled in a state of being protruded to the outer circumferential cutter 4 of the receiving-side shield machine B _1, as shown in FIG. 2 (a), the receiving-side shield machine B ₁ and intrusive When the side shield machine S reaches the joining point, the pin expansion / contraction jack 10 shown in FIG. 1 is contracted to stop the rotation stopping pin 9 to release the engagement with the engaging hole 4b of the outer peripheral cutter 4, and the tilting jack 8 2 by rotating the outer peripheral cutter 4 about the support shaft 6 by the arm member 7.
and stores the cutter disk device D _1, as shown in (b). Thereafter, as shown in FIG. 2 (c), together with the retract along the inner periphery of the skin plate P of the receiving-side shield machine B ₁ and the cutter disk apparatuses D ₁ and the shield machine structure 2, add to this backward movement moving to penetrate the penetration side shield machine S in the receiving side shield machine B ₁ of the skin plate P.
That is, with the front surface of the cutter disk device D ₁ of the receiving-side shield machine B ₁ and the front surface of the cutter disk device of the penetrating-side shield machine S kept at a substantially constant distance, the cutter disk device D ₁ of the receiving-side shield machine B ₁ is maintained. At the same time, the penetration side shield machine S penetrates into the skin plate P at the same time. At this time, the inner peripheral ring 2a is retracted together with the shield machine structure 2, and the tube seal 1 is exposed on the inner peripheral side of the skin plate P. Then, if the tube seal 1 is expanded in this state, the body outer diameter surface portion of the penetration side shield machine S and the inner peripheral portion of the skin plate P are mechanically stopped from water.

As shown in FIG. 3, in the joint portion where the water is stopped by the tube seal 1, the seal portion 1a of the tube seal 1 is in contact with the outer diameter surface of the fuselage of the penetration side shield machine S. Even if water pressure acts, the sealing member 1a acts to increase the sealing effect by pressing the body outer diameter surface of the penetration side shield machine S, so that the water stopping effect can be increased.

Therefore, even when joining tunnels of different diameters, shield machines of different diameters can be easily joined concentrically in the ground without providing a shaft, so that the construction period of the tunnel construction of different diameters is reduced. It is possible to greatly reduce the construction cost as well as the cost.

[0028] In the case where the side over the cutter provided in the cutter disc around the penetration side shield machine S protrudes stores before penetrating the receiving side shield machine B _1.

In the first embodiment, since the outer peripheral cutter 4 is rotated by the tilting jack 8 via the arm member 7, a mechanism for projecting or storing the outer peripheral cutter 4 with a simple structure is provided. be able to.

By the way, the ground junction between the receiving-side shield machine B ₁ and penetrating side shield machine S, the number is also misaligned by joining the tunnel thousands m With the recent sensor technology mm~
It is possible to join with an error of about several tens of mm. Thus, the difference between the outer diameter of the skin plate P inside diameter of the receiving-side shield machine B ₁ and penetrating side shield machine S can be, for example, if there is a difference of about 30 mm, inflated amount of the tube seal 1 also about 2
What is necessary is just about 0 mm-30 mm. The diameter difference and the bulging amount may be set to optimum values depending on the size of the shield machine, excavation conditions, and the like, and are not limited to the above examples.

On the other hand, if there is a difference between the excavation by the receiving-side shield machine B ₁ and the excavation by the penetrating-side shield machine S (for example, several months to several years), the receiving-side shield machine B ₁ after drilling the large diameter tunnel to the joining point in a state of being protruded to the outer circumferential cutter 4 of the cutter disk device D _1, when retracted with shield machine structure 2 stores the outer peripheral cutter 4 to the cutter disk apparatus D ₁ ,
Retracted while injecting a solidifying material such as an alternative to sand in the space at a later date, penetrate the penetration side shield machine S is skin plate P of the receiving-side shield machine B ₁ while excavating the solidifying material such as upon reaching the junction point Then, underground joining may be performed.

[0032] By retracting thus the cutter disk apparatuses D ₁ of the receiving side shield machine B ₁ above, since even if the period differences for receiving side shield machine B ₁ can be dismantled previously The construction period required for tunnel construction can be shortened.

Next, a second embodiment will be described with reference to a front view of an underground joining shield machine shown in FIG. 4A and a sectional view taken along line BB of FIG. 4B. The second embodiment differs from the first embodiment only in the configuration of the cutter disk device. The skin plate P and the shield machine structure 2 of the receiving-side shield machine are the same as those in the first embodiment, and therefore are the same. The components are denoted by the same reference numerals, and description thereof is omitted. In addition, the penetration side shield machine S
Are the same.

As shown in the drawing, a shield machine structure 2 is provided inside the skin plate P of the receiving-side shield machine B ₂ , and a cutter disk device D ₂ is provided in front of the shield machine structure 2. The shield machine structure ₂ together with the cutter disk device D2 is configured to be able to retreat while sliding on the inner surface of the skin plate P by driving means (not shown).

In the cutter disk device D ₂ , similarly to the first embodiment, the outer diameter of the disk frame 11 is formed smaller than the inner diameter of the skin plate P. An outer peripheral cutter 12 capable of excavating to an outer diameter of P is provided.
The number of the outer peripheral cutters 12 may be appropriately determined similarly to the above-described first embodiment.

The outer peripheral cutter 12 is provided so as to be able to protrude / retract from the periphery of the cutter disk device D _{2. In} this embodiment, each frame member of the disk frame 11 is also provided from the side of the cutter disk device D _2. 11a
It is configured to be able to protrude or to be stored on an external extension line. Outer peripheral cutter 12 in the second embodiment
Is projected or stored in the outer peripheral cutter base end 12.
a rotatably supported by a support shaft 14 provided on a frame member 11a of the disk frame 11, and a support shaft 13 provided on one side rear portion of the base end portion 12a. The rotary shaft 15 is rotated by a tilting jack 16 which is a driving means which is rotatably supported on the base end 16a of the frame member 11a. 11b is a guide member at the tip of the tilting jack 16. The tilting jack 16 is also preferably a hydraulic cylinder such as a hydraulic cylinder or a pneumatic cylinder because of its simple configuration.

On the other hand, also in the second embodiment, a rotation stopping means for suppressing the rotation of the outer peripheral cutter 12 against the excavating force in a state where the outer peripheral cutter 12 is projected is provided. This detent means includes a U-shaped detent member 17 having a parallel surface 13a formed at the support portion 13 of the outer peripheral cutter 12a, and having a parallel surface 17a at its tip which can be fitted into the parallel surface 13a. It is configured by providing a slide jack 19 for sliding the member 17 along a guide member 18 provided on the inner surface of the frame member 11a. Note that a base end 19a of the slide jack 19 is supported by the frame member 11a.

Accordingly, if the rotation preventing member 17 is fitted into the support portion 13 with the outer peripheral cutter 12 protruding, the rotation of the outer peripheral cutter 12 is controlled by the rotation of the outer peripheral cutter 12 and the guide member 18 of the disk frame 11. Since suppression is performed by the frame member 11a, it is possible to easily counter a large excavation reaction force. Also in the second embodiment, in the state where the outer peripheral cutter 12 is rotated and protruded, the outer peripheral cutter 1
2 is in contact with the frame member 11a,
Also in this aspect, a rotation suppressing effect is exhibited.

[0039] According to the receiving side shield machine B ₂ of the ground bonding shield method of the second embodiment constructed as described above, FIG. 4 and FIG. 5 (a), (b) , as shown in (c) Then, underground joining is performed.

[0040] That is, as shown in FIG. 4, drilled in a state of being protruded to the outer circumferential cutter 12 of the receiving-side shield machine B _2, as shown in FIG. 5 (a), the receiving-side shield machine B ₂ and intrusive When the side shield machine S reaches the joining point, the locking member 17 is retracted along the guide member 18 by the slide jack 19 shown in FIG. by reducing the 16 stored in the cutter disk apparatus D in _2, as shown in Figure by rotating the outer peripheral cutter 12 by the rotation about the supporting portion 13 by rotating the rotating shaft 15 5 (b). And
As shown in FIG. 5C, the cutter disk device D ₂
Accepting shield and with retracting along the shield machine structure 2 in skin plate P inner periphery of the receiving side shield machine B _2, the penetration side shield machine S and Tsuido the retracting movement of the cutter disc device D ₂ skin plate P of the machine B ₂
When the tube seal 1 provided on the inner periphery of the skin plate P of the receiving-side shield machine B ₂ is expanded in this state, the outer peripheral surface of the body of the penetrating-side shield machine S and the inner periphery of the skin plate P are expanded. Water can be stopped mechanically with the part.

Accordingly, even when joining tunnels of different diameters, the tunnels can be joined concentrically in the ground without providing a shaft, so that the construction period of the tunnels of different diameters is greatly reduced and the construction cost is greatly reduced. Can be reduced.

[0042] Incidentally, waterproofing effect tube seal 1 is the same as the first embodiment described above, also, the excavation by the receiving-side shield machine B ₂ by drilling and penetrating side shield machine S occurs a period to the difference In this case, the same operation as in the first embodiment may be performed.

According to the shield method in which the small-diameter penetrating-side shield machine S penetrates into the large-diameter receiving-side shield machines B ₁ and B ₂ and is joined underground as in the first and second embodiments described above. As shown in the side sectional view of FIG.
_1, since the tube seal 1 provided in the peripheral skin plate P of B ₂ can be water stopping mechanical in between the fuselage outer diametric surface of the penetrating end shield machine S, concentric different-diameter tunnel in the ground It is possible to shorten the construction period of the tunnel construction of the different diameter by connecting to the upper part, and to reduce the construction cost.

In the first and second embodiments described above, the outer peripheral cutters 4 and 12 are stored in different directions from each other, but the storing direction may be determined according to use conditions and the like.

[0045]

The invention according to the present application is configured as described above, and has the following effects.

[0046] wherein, according to the cutter disk apparatus of the underground junction shield machine according to claim 1, the cutter disk device around the cutter disk with a diameter smaller than the skin plate inner diameter of the receiving side shield machine, the proximal end of the outer cutter Department
Around the support shaft that supports the support part provided at the center of rotation
The cutter can be easily protruded or stored, and if the outer peripheral cutter is protruded, the outer peripheral cutter becomes a cutter disk device capable of excavating up to the outer diameter of the receiving-side shield machine. If stored, the cutter disk device becomes a cutter disk device of the receiving side shield machine in the underground joining shield machine that can make the diameter of the cutter plate device smaller than the inner diameter of the skin plate of the receiving side shield machine. if penetration of the shield machine, it is possible to reduce the construction cost by shortening the construction period of the different diameter tunnel construction by in earth bonding.

[0047] According to the cutter disk drive underground junction shield machine according to claim 2, together with the effect of the first aspect of the cutter disk device, it is protruded to the outer circumferential cutter by Mawaritome means provided on the disc frame If the rotation is suppressed in this state, it is easy to maintain the projecting state against the excavation force acting on the outer peripheral cutter, and it is possible to shorten the construction period of tunnel work of different diameter and reduce the construction cost. Become.

[Brief description of the drawings]

FIG. 1 is a drawing showing a cutter disk portion of an underground joining shield machine of a first embodiment according to the present application, (a) is a front view, and (b) is a cross-sectional view along AA.

FIGS. 2 (a), (b), and (c) are process diagrams showing an underground bonding shield method using the underground bonding shield machine shown in FIG.

FIG. 3 is a sectional view showing a tube seal at an underground joint.

FIGS. 4A and 4B are views showing a cutter disk portion of an underground joining shield machine according to a second embodiment of the present application, wherein FIG. 4A is a front view and FIG.

5 (a), (b), and (c) are process diagrams showing an underground joining shield method using the underground joining shield machine shown in FIG.

FIG. 6 is a side sectional view showing a shield machine that is joined underground by the underground joining shield method according to the present application.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Tube seal 2 ... Shield machine structure 3 ... Disc frame 4 ... Outer peripheral cutter 5 ... Support part 6 ... Support shaft 7 ... Arm member 8 ... Tilt jack 9 ... Detent pin 10 ... Pin telescopic jack 11 ... Disc frame 12 ... outer peripheral cutter 13 ... supporting portion 14 ... supporting shaft 15 ... pivot shaft 16 ... tilting jack 17 ... Mawaritome member 18 ... guide member 19 ... slide jack P ... skin plate S ... penetrating side shield machine B _1, B ₂ ... accepting Shield machine D ₁ , D ₂ … Cutter disk device

──────────────────────────────────────────────────続 き Continued on the front page (72) Muneo Yoshimura, Inventor Kashima Construction Co., Ltd. 1-2-7 Moto-Akasaka, Minato-ku, Tokyo (72) Inventor Toshikazu Satta 1-2-7, Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Yasuhiro Ueki 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Masayuki Bito 1-3-8 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. Tokyo Branch (72) Inventor Takeshi Nakagawa 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (56) References JP-A-6-73976 (JP, A) 4-55594 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) E21D 9/06 301 E21D 9/12

Claims (2)

(57) [Claims] 1. A cutter disk device of a receiving-side shield machine in an underground joining shield method in which a large-diameter receiving-side shield machine and a small-diameter penetrating-side shield machine are concentrically joined underground. The disk frame is formed to have a diameter smaller than the inner diameter of the skin plate of the receiving-side shield machine, and an outer peripheral cutter capable of excavating up to the outer diameter of the receiving-side shield machine is provided around the cutter disk device.
A support portion is provided at the base end of the cutter, and a support for supporting the support portion is provided.
A support shaft is provided on the disk frame, and the support shaft is
Drive means for rotating the base end of the outer peripheral cutter
A cutter disk device for an underground joining shield machine, wherein an outer peripheral cutter is provided on a disk frame so as to be able to protrude / retract freely. In a state in which wherein is protruded outer peripheral cutter, cutter of claim 1 Symbol placement of underground junction shield machine, characterized in that a Mawaritome means for inhibiting the rotation of the outer circumferential cutter disk frame Disk device.