JP2003155892A - Tunnel excavator and collection method of the tunnel excavator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To collect structures constituting an excavator to be reutilized in a tunnel excavator and a collection method of the tunnel excavator. SOLUTION: A cutter head 20 is constituted of a cutter head center part 23 and a cutter head outer peripheral part 24. A drive part body 14 equipped with a rotary ring 17, a ring gear 18, a drive motor 21 and the like is detachably mounted on an excavator body 11. The cutter head center part 23 is detachably mounted on the rotary ring 17, and the cutter head outer peripheral part 24 is detachably mounted on the cutter head center part 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tunnel excavator which propels a tunnel excavator to excavate a tunnel having a predetermined length and then separates and recovers constituent members such as a cutter head and the tunnel excavator. Regarding the recovery method, it is suitable for use in a mud pressure shield excavator, a muddy water shield excavator, a tunnel boring machine, and the like.

[0002]

2. Description of the Related Art Generally, in a shield excavator, a disc-shaped cutter head is rotatably mounted on a front portion of a cylindrical excavator body, and the cutter head is rotatably supported by a drive unit. On the other hand, a large number of shield jacks for advancing the excavator body are mounted on the rear part, and an erector device for mounting the segments on the inner wall surface of the existing tunnel is mounted. Therefore, if the shield jack is extended while the cutter head is rotated by the drive device, the excavator body advances due to the reaction force from the existing segment, and a large number of cutter bits attached to the cutter head excavate the ground in front. And tunnels can be formed.

When constructing a tunnel in a predetermined construction section using such a shield excavator, a starting shaft and a reaching shaft are excavated in advance in this construction section, and the shield excavator is carried into the starting shaft. With the excavation reaction force secured in the starting shaft, the ground is penetrated from the starting port to excavate along a predetermined route. Then, when the shield excavator advances to the reaching shaft, the shield main body is pulled out into the reaching shaft from the previously formed reaching port. In this way, a tunnel is constructed at a predetermined position.

By the way, the shield excavator that has reached the reaching shaft is disassembled and a part thereof is collected on the ground, while the rest is buried underground as a tunnel structure. That is, in the shield excavator, first, the cutter head is divided into small pieces by the gas cutting machine, and the crane is pulled up to the ground through the reaching shaft, and then the cutter head driving device is also divided into small pieces by the gas cutting machine. It is pulled up to the ground through the reaching shaft, and the shield jack, the erector device, and the soil discharge device (mud pipe, mud pipe, agitator, screw conveyor, etc.) are removed from the excavator main body and pulled up by the crane. Then, the remaining excavator main body is connected and buried in the existing segment as a part of the tunnel structure. In this case, the cutter head that has been divided and pulled up to the ground and its drive device are scrapped.

[0005]

From the viewpoint of the global environment, the increase of industrial waste due to the scrap processing of the tunnel excavator is not preferable. Further, in terms of manufacturing cost of the tunnel excavator, scrap processing only by excavation work in one section is inefficient, and reuse is desired.

The present invention solves such a problem, and provides a tunnel excavator and a tunnel excavator recovery method capable of recovering and reusing structures constituting an excavator. To aim.

[0007]

In order to achieve the above object, a tunnel excavator according to a first aspect of the present invention is a tunnel excavator in which a cutter head capable of being driven and rotated is attached to a front portion of a main body of the excavator. In an excavator, the cutter head is composed of a separable center portion and an outer peripheral portion located on the outer peripheral side of the central portion, and both of the central portion and the outer peripheral portion are moved from one side to the other side. It is characterized in that a connection pin for connecting is provided.

In the tunnel excavator of the present invention, the central portion of the cutter head is connected to the output transmission portion of the cutter driving device mounted on the excavator body, and the outer peripheral portion is detachably attached to the central portion. It is characterized by being connected to.

According to a third aspect of the present invention, in the tunnel excavator, the cutter driving device has a rotating body rotatably supported at a front portion of the excavator body and a drive motor for driving the rotating body. It is characterized in that the central portion is connected through an intermediate beam extending forward from the rotating body.

In the tunnel excavator according to the invention of claim 4, a connecting jack having the connecting pin is provided on either one of the central portion and the outer peripheral portion of the cutter head, and the connecting pin is detachably connectable to the other. It is characterized in that a connection block having holes is provided.

The tunnel excavator according to a fifth aspect of the invention is characterized in that a driving force transmission path is provided inside the connection pin.

In the tunnel excavating machine according to a sixth aspect of the present invention, the driving force transmission path is a hydraulic pipe for driving a copy cutter mounted on an outer peripheral portion of the cutter head.

According to a seventh aspect of the tunnel excavating machine of the present invention, the outer peripheral portion of the cutter head has a ring shape and is separable into a plurality of pieces in the circumferential direction.

Further, in the method for collecting a tunnel excavator according to the invention of claim 8, the tunnel excavator is propelled to excavate the tunnel, and when the cutter head penetrates the reaching shaft, the rotation of the cutter head is stopped, and then, first, , The connecting pin between the center of the cutter head and the outer periphery of the cutter head is pulled out, the outer periphery of the cutter head is separated from the center of the cutter head and recovered on the ground through the reaching shaft, and then the center of the cutter head is excavated by the excavator. It is characterized in that it is separated from the main body and collected on the ground through the reaching shaft.

According to a ninth aspect of the present invention, there is provided a method of recovering a tunnel excavator, wherein after the tunnel excavator propels and rotates a cutter head to excavate a tunnel for a predetermined distance, rotation of the cutter head is stopped, and then the cutter is first cut. Pull out the connecting pin that connects the center of the head and the outer periphery of the cutter head,
The outer peripheral portion of the cutter head is separated from the central portion of the cutter head, and then the central portion of the cutter head and the cutter driving device are separated from the excavator body and collected on the ground through an existing tunnel at the rear, and then the cutter. The feature is that the outer peripheral portion of the head is collected on the ground through an existing tunnel at the rear.

[0016]

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

FIG. 1 is a front view of a tunnel excavator according to an embodiment of the present invention, FIG. 2 is a schematic sectional view of the tunnel excavator of the present embodiment, FIG. 3 is a front view of the center of the cutter head, and FIG. 4 is a cutter. FIG. 5 is a front view of the outer peripheral portion of the head, FIG. 5 is a cross section showing a connecting portion between the central portion of the cutter head and the outer peripheral portion of the cutter head, FIG. 6 is a sectional view of a connecting jack, and FIG. A cross section is shown.

In the tunnel excavator of this embodiment, as shown in FIGS. 1 and 2, the excavator main body 11 has a cylindrical shape, and a pair of front and rear bulkheads 12 and 13 are formed at the front end thereof. A drive unit main body 14 is fixed to the flange portions of 12 and 13 by a plurality of bolts 15, and a rotary ring 17 as an output transmission unit is rotatably supported on the drive unit main body 15 by a bearing 16. A ring gear 18 is fixed to the rear part of the rotary ring 17, while a cutter head 20 is mounted to the front part via a plurality of intermediate beams 19. Further, a plurality of drive motors 21 are mounted on the drive unit main body 14, and drive gears 22 of the respective drive motors 21 mesh with the ring gear 18, and the drive unit main body 14, the rotary ring 17, and the ring gear 1
8, the drive motor 21 and the like constitute a cutter drive device. Therefore, when the drive motor 21 is driven to rotate the drive gear 22, the cutter head 20 can be rotated via the ring gear 18 and the rotary ring 17.

The cutter head 20 comprises a cutter head central portion 23 and a cutter head outer peripheral portion 24 located on the outer peripheral side of the cutter head central portion 23, and the cutter head central portion 23 is attached to the rotary ring 17. The cutter head outer peripheral portion 24 is detachably attached to the cutter head central portion 23. That is, as shown in FIGS. 2 and 3, the cutter head center portion 23 is
The plurality of spokes 26 are radially connected to each other, and the tips of the respective spokes 26 are connected to the plurality of connecting rings 27. The fishtail bit 28 is fixed to the center portion 25, and a large number of spokes 26 are provided on the front surface of each spoke 26. The leading bit 29 is fixed, and the cutter bits 30 are fixed on both sides of each spoke 26. A rotary joint 31 is attached to the center of the drive unit main body 14, and electric wiring, a hydraulic hose and the like (not shown) are housed inside.

On the other hand, as shown in FIGS. 2 and 4, in the cutter head outer peripheral portion 24, a plurality of spokes 32 corresponding to the respective spokes 26 of the cutter head central portion 23 are connected by a connecting ring 33.
The leading bits 34 are fixed to the front surface of each spoke 32, and the cutter bits 35 are fixed on both sides. The copy cutter 36 can be retracted from the tip of one or two spokes 29 by a hydraulic jack 37. Although the cutter head outer peripheral portion 24 has a ring shape, it may be separable into a plurality of pieces in the circumferential direction in consideration of recoverability.

In the cutter head center portion 23, the intermediate beam 19 is detachably attached to the rotary ring 17 by a plurality of bolts 38. Further, the cutter head outer peripheral portion 24 is attachable to and detachable from the cutter head central portion 23 by a connecting pin 45 described later.

That is, as shown in FIGS. 2, 5 and 6, a hydraulic connection jack 40 is attached to the end plate 39 at the tip of each spoke 26 at the center 23 of the cutter head.
It is fixed by 1. The connecting jack 40 has a hollow casing 42 in which a piston 44 integrated with a drive rod 43 is movably fitted, and a connecting pin 45 is provided at a tip portion thereof.
Are integrally formed. Then, the connection pin 45 can be retracted by supplying and discharging the hydraulic pressure to and from the oil chambers 42a and 42b in the casing 42 defined by the piston 44. On the other hand, on the outer peripheral portion 24 of the cutter head, a connection block 47 is fixed to the end plate 46 at the base end portion of each spoke 32 by a mounting bolt (not shown), and the connection pin 45 of the connection jack 40 is attached to this connection block 47. A connection hole 48 that can be engaged and disengaged is formed.

Then, the drive rod 43 and the connecting pin 45
A plurality of insertion holes 49, 50 as driving force transmission paths are provided therein.
Is provided. These insertion holes 49, 50 are hydraulic pipes for driving the hydraulic jack 37 of the copy cutter 36, and have pipe ports 49a, 49b, 50a, 5 at their ends.
0b is provided and a connection hose 51 for supplying and discharging hydraulic pressure
a, 51b, 52a, 52b are connectable.
In the present embodiment, the drive rod 43 and the connecting pin 4
Although the plurality of insertion holes 49 and 50 formed in 5 are hydraulic pipes for the copy cutter 36, they may be used as power cable arrangement holes for various sensors and mud material supply holes.

Further, as shown in FIGS. 1 and 2, a plurality of shield jacks 53 are arranged along the circumferential direction in the rear portion of the excavator main body 11, and the shield jacks 53 are arranged side by side. By pushing against the existing segment S constructed on the inner peripheral surface of the tunnel which is extended backward in the excavation direction, the excavator body 11 can be advanced by its reaction force. Further, a swivel ring 55 is supported on the rear end of the excavator body 11 via a support bracket 54 so that the swivel ring 55 can be driven and swung.
An erector device 56 for assembling is installed.

Further, a plurality of tail packings 57 that are in close contact with the outer peripheral surface of the existing segment S are attached to the rear end portion of the excavator main body 11 to prevent infiltration of mud or muddy water into the excavator main body 11. It is blocking. Also, the excavator body 11
A screw conveyor 58 is tilted forward, and is held in this tilted state by a support rod 59. The tip end of the screw conveyor 58 communicates with the chamber 60 through the openings of the bulkheads 12 and 13. The excavated earth and sand can be discharged to the outside.

Here, the tunnel excavation work by the tunnel excavator of the above-described embodiment and the recovery work of the tunnel excavator after excavation will be described.

In order to excavate and form a tunnel, as shown in FIGS. 1 and 2, first, a starting shaft having a predetermined depth is excavated at an excavation start position, and a tunnel excavator is carried into the starting shaft and driven. While the cutter head 20 is being rotated by the motor 21, the shield jack 53 is extended to obtain an excavation reaction force from the inside of the starting shaft to advance the excavator main body 11, and the vertical wall of the starting shaft is excavated to start tunnel excavation work. . Then, as the ground is excavated by the cutter head 20, the excavated soil is discharged from the chamber 60 to the outside by the screw conveyor 58, and the segment S is assembled in a ring shape by the erector device 56 to construct a tunnel.

On the other hand, at the end of excavation in the construction section, a reaching shaft with a predetermined depth is excavated, and a tunnel constructed from the starting shaft by the tunnel excavator is made to reach this reaching shaft. In this case, it is necessary to excavate the reaching shaft according to the size of the cutter head 20 or the like to be separated and collected. Then, when the tunnel construction of the predetermined construction section is completed and the cutter head 20 of the tunnel excavator penetrates the reaching shaft, the rotation of the cutter head 20 by the drive motor 21 is stopped,
The tunnel excavator is dismantled and the components are recovered from the reaching shaft.

That is, when the front end of the excavator body 11 penetrates the reaching shaft, the rotation of the cutter head 20 is stopped. In this state, each connection jack 4 of the cutter head center portion 23
0 to drive the drive rod 43 to contract, and the connection hole 48 of each connection block 47 fixed to the cutter head outer peripheral portion 24.
Pull out the connection pin 45 from. Then, the connection between the cutter head central portion 23 and the cutter head outer peripheral portion 24 is released, and as shown in FIG. 7, the cutter head outer peripheral portion 24 is removed from the cutter head central portion 23 and is not laid in the reaching vertical shaft. This cutter head outer peripheral portion 24 is moved forward by a dedicated jack along the rail. Then, a hanging jig (not shown) is attached to the cutter head outer peripheral portion 24, a rope lowered from a crane installed on the ground into the reaching shaft is connected, and the cutter head outer peripheral portion 24 is pulled up to the ground by this crane. to recover. in this case,
If the cutter head outer peripheral portion 24 is separable in the circumferential direction, it is lifted to the ground by a crane and recovered in the divided state.

Next, the bolts 38 are loosened to remove the cutter head center portion 23 from the rotary ring 17, and the cutter head center portion 23 is moved forward along the rail.
Then, a hanging jig (not shown) is attached to the cutter head central portion 23, a rope lowered from the crane installed on the ground into the reaching shaft is connected, and the cutter head central portion 23 is pulled up to the ground by this crane. to recover.

Next, the bolts 15 are loosened to remove the drive unit body 14 (cutter drive device) from the excavator body 11, and the drive unit body 14 is moved forward along the rails. Then, a hanging jig is attached to the drive unit main body 14, a rope lowered from the crane into the reaching shaft is connected, and the cutter head is pulled up to the ground by this crane to be collected. In this case, if the diameter of the reaching shaft is sufficient, the cutter head center portion 23 and the driving portion main body 14 may be integrally pulled up and collected.

After the cutter head 20 and the cutter driving device are removed from the excavator main body 11 and collected as described above, the shield jack 53, the erector device 56, the screw conveyor 58, various sensors and the like are subsequently removed and collected. Then, the excavator main body 11 remaining in the ground is joined to the existing segment S by welding or concrete placing and used as a tunnel structure.

As described above, in the tunnel excavator of this embodiment, the cutter head 20 is connected to the cutter head center portion 23.
And the cutter head outer peripheral portion 24, and the rotary ring 1
7, the drive unit main body 14 on which the ring gear 18, the drive motor 21 and the like are mounted, is detachable from the excavator main body 11,
The cutter head central portion 23 is attachable to and detachable from the rotary ring 17, and the cutter head outer peripheral portion 24 is attachable to and detachable from the cutter head central portion 23.

Therefore, after the tunnel excavation work is completed, the cutter head outer peripheral portion 24, the cutter head central portion 23, and the drive portion main body 14 are sequentially separated from the excavator main body 11, and these are recovered from the reaching vertical shaft to the ground by a crane. It becomes possible to reuse, and by reusing the cutter head 20, the drive motor 21 and the like, it is possible to reduce the manufacturing cost of the excavator and suppress an increase in industrial waste due to scrap processing. . Furthermore, the excavator main body can be separated when necessary and can be recovered from the reaching shaft and reused.

When the cutter head 20 is recovered, the worn fish tail bit 28, the preceding bits 29 and 34, the cutter bits 30 and 35, and the copy cutter 3 are worn.
6 may be replaced, and the drive unit main body 14 including the drive motor 21 may be slightly maintained. When the drive unit main body 14 is reused, the number of the drive motors 21 to be mounted may be changed according to the required output that differs depending on the diameter of the excavation tunnel and the type of excavated ground.

Further, in the present embodiment, the connection jacks 40 capable of retracting the connection pins 45 are mounted on the spokes 26 of the cutter head central portion 23, while the cutter head outer peripheral portion 24.
Connection hole 48 in which the connection pin 45 can be engaged and disengaged with the spoke 32
The connection block 47 having the is attached. Therefore, the cutter head center portion 23 can be obtained by simply driving the connecting jack 40 and pulling out the connecting pin 45 engaged with the connecting hole 48.
The cutter head outer peripheral portion 24 can be disengaged, and the cutter head outer peripheral portion 24 can be easily removed from the cutter head central portion 23. The disassembling work may be performed by remotely operating the connection jack 40, and the worker does not need to enter the face or the chamber 60, and the work safety can be sufficiently ensured.

Further, a plurality of insertion holes 49 and 50 are provided in the drive rod 43 and the connection pin 45.
It is possible to use 9, 50 as hydraulic pipes for driving the copy cutter 36, holes for arranging power cables for various sensors, holes for supplying mud material, and the like. Therefore, when dismantling the cutter head outer peripheral portion 24 with respect to the cutter head central portion 23,
Separation work of hydraulic pipes, power cables, mud supply pipes, etc. becomes easy.

In the above-described embodiment, the reaching shaft is excavated together with the starting shaft in advance, and after the completion of the tunnel construction, the cutter head 20 and the like are disassembled and collected from the reaching shaft to the ground. , It can also be recovered by returning to the starting shaft. That is, after excavating the tunnel for a predetermined distance, after the rotation of the cutter head 20 is stopped, first, the connection jack 40 pulls out the connection pin 45 from the connection hole 48, and the cutter head center portion 23 and the cutter head outer peripheral portion 2
The engagement with 4 is released, and the cutter head outer peripheral portion 24 is removed from the cutter head central portion 23. Subsequently, the cutter head center portion 23 and the drive portion main body 14 are arranged in this order in the excavator main body 11
Remove from. Here, from the excavator main body 11 to the shield jack 53, the elector device 56, the screw conveyor 5
8. Remove various sensors, etc., carry them by a carriage that is movably supported in the existing tunnel, and collect them from the starting shaft. Further, the cutter head outer peripheral portion 24, the cutter head central portion 23, and the cutter head outer peripheral portion 24 are similarly transported by the transport carriage and recovered from the starting shaft.

Although the cutter head outer peripheral portion 24 has a ring shape in the above embodiment, it may be divided into two or three or more parts. In this case, one member should be lightweight. With this, the recovery work becomes easy and the starting shaft and the reaching shaft can be made small in diameter. Further, although the excavator main body 11 is buried to form a tunnel structure, the segments may be assembled up to the reaching vertical shaft by the erector device 56 and joined together to recover the segment from the reaching vertical shaft to the ground.

[0040]

As described above in detail in the embodiments, according to the tunnel excavator of the first aspect of the invention, the cutter head mounted to the front portion of the excavator main body so as to be rotatable can be used as a central portion. After the tunnel excavation work is completed, since it is composed of the outer peripheral portion located on the outer peripheral side of the central portion, and the connecting pin which moves from one side of the central portion and the outer peripheral portion to the other side to connect the two is provided. , The outer peripheral part of the cutter head is separated from the excavator body and can be easily recovered on the ground for reuse, and it is possible to reduce the manufacturing cost of the excavator in which the recovered members are reused and scrap. It is possible to suppress the increase of industrial waste due to treatment, and
By simply moving the connecting pin, the engagement between the central part and the outer peripheral part can be released, and the outer peripheral part can be easily removed. Furthermore, during this dismantling work, the operator does not have to enter the face, and the workability and Work safety can be improved.

According to the tunnel excavator of the second aspect of the invention, the central portion of the cutter head is connected to the output transmission portion of the cutter driving device mounted on the excavator body, and the outer peripheral portion is detachably connected to the central portion. Therefore, the central portion and the outer peripheral portion can be easily attached and detached, and the workability of the cutter head recovery operation can be improved.

According to the tunnel excavator of the third aspect of the invention, the cutter driving device has a rotating body rotatably supported on the front part of the excavator body and a drive motor for driving the rotating body. Since the central portion is connected through the intermediate beam extending forward from the center portion, the work of removing the central portion and the outer peripheral portion is performed in the chamber, and the workability of the cutter head recovery operation can be improved.

According to the tunnel excavator of the fourth aspect of the present invention, the connecting jack having the connecting pin is provided on either the central portion or the outer peripheral portion of the cutter head, and the other connecting hole is provided with the connecting pin which can be engaged and disengaged. Since we have a connection block with
The workability of attaching and detaching the central portion and the outer peripheral portion of the cutter head can be improved with a simple configuration.

According to the tunnel excavator of the fifth aspect of the present invention, since the driving force transmission path is provided inside the connecting pin, when removing the outer peripheral portion from the central portion of the cutter head, hydraulic pipes, electric power cables, etc. Removal work can be performed simultaneously and easily, and workability can be improved.

According to the tunnel excavator of the sixth aspect of the invention, since the driving force transmission path is the hydraulic pipe for driving the copy cutter mounted on the outer peripheral portion of the cutter head,
The structure can be simplified and workability can be improved.

According to the tunnel excavator of the seventh aspect of the invention, since the outer peripheral portion of the cutter head is formed into a ring shape and can be separated into a plurality of pieces in the circumferential direction, the recovery work is facilitated by reducing the weight of the recovery member. The starting shaft and the reaching shaft can have a small diameter.

According to the method of collecting a tunnel excavator of the present invention, the tunnel excavator is propelled to excavate the tunnel, and when the cutter head penetrates the reaching shaft, the rotation of the cutter head is stopped. First, the connecting pin between the center of the cutter head and the outer periphery of the cutter head is pulled out, the outer periphery of the cutter head is separated from the center of the cutter head and collected on the ground through the reaching shaft, and then the center of the cutter head is excavated. Since it was separated from and collected on the ground through the reaching shaft, the cutter head can be easily disassembled and collected, and the cutter head can be reused,
It is possible to reduce the manufacturing cost of an excavator that reuses the collected cutter head, and to suppress an increase in industrial waste due to scrap processing.

According to the method of recovering a tunnel excavator of the present invention, when the tunnel excavator propels and rotates the excavator to excavate a tunnel for a predetermined distance, the cutter head is stopped from rotating, and then the cutter head is stopped. The connecting pin that connects the central portion and the cutter head outer peripheral portion is pulled out, the cutter head outer peripheral portion is separated from the cutter head central portion, and then the cutter head central portion and the cutter driving device are separated from the excavator main body and rear The cutter head is collected on the ground through the existing tunnel, and then the outer periphery of the cutter head is collected on the ground through the existing tunnel behind, so the cutter head can be easily disassembled and collected, and the cutter head can be reused. This makes it possible to reduce the manufacturing cost of an excavator that reuses the collected cutter head, and at the same time, scrap processing is possible. It is possible to suppress the increase of industrial waste by.

[Brief description of drawings]

FIG. 1 is a front view of a tunnel excavator according to an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view of the tunnel excavator of the present embodiment.

FIG. 3 is a front view of a central portion of a cutter head.

FIG. 4 is a front view of the outer peripheral portion of the cutter head.

FIG. 5 is a cross-sectional view showing a connecting portion between a central portion of the cutter head and an outer peripheral portion of the cutter head.

FIG. 6 is a sectional view of a connection jack.

FIG. 7 is a schematic cross-sectional view of the tunnel excavator with the cutter head outer peripheral portion removed.

[Explanation of symbols]

11 Excavator body 12,13 Bulkhead 14 Drive unit body 15 volts 17 Rotating ring (output transmission part) 19 Intermediate beam 20 cutter head 21 Drive motor 23 Center of cutter head 24 Cutter head outer circumference 26,32 spokes 36 Copy cutter 37 hydraulic jack 38 Volts 40 connection jack 45 connection pin 47 connection block 48 connection holes 49,50 insertion holes 53 Shield jack (propulsion jack) 56 Erector device

Claims (9)

[Claims] 1. A tunnel excavator in which a cutter head capable of being driven and rotated is mounted on a front portion of a cylindrical excavator body, and the cutter head is located at a central portion at which the cutter head can be divided and on an outer peripheral side of the central portion. A tunnel excavator, comprising a peripheral portion, and provided with a connecting pin that moves from one side of the central portion and the peripheral portion to the other side to connect them. 2. A center portion of the cutter head is connected to an output transmission portion of a cutter driving device mounted on the excavator body, and an outer peripheral portion of the cutter head is detachably connected to the center portion. A tunnel excavator characterized by that. 3. The cutter driving device according to claim 2, further comprising a rotating body rotatably supported on a front portion of the excavator main body and a drive motor for driving the rotating body, and the front side of the rotating body. A tunnel excavator characterized in that the central portion is connected through an intermediate beam extending to the. 4. The connection jack according to claim 1, wherein a connection jack having the connection pin is provided on one of a central portion and an outer peripheral portion of the cutter head, and a connection hole on which the connection pin is detachable. Tunnel excavator characterized by having a block. 5. The tunnel excavator according to claim 1, wherein a driving force transmission path is provided inside the connection pin. 6. The tunnel excavator according to claim 5, wherein the driving force transmission path is a hydraulic pipe for driving a copy cutter mounted on an outer peripheral portion of the cutter head. 7. The tunnel excavator according to claim 1, wherein an outer peripheral portion of the cutter head has a ring shape and is separable into a plurality of pieces in a circumferential direction. 8. A pin for connecting a central portion of the cutter head and an outer peripheral portion of the cutter head after stopping rotation of the cutter head when the tunnel head is driven to excavate the tunnel and the cutter head penetrates the reaching shaft. To separate the outer periphery of the cutter head from the center of the cutter head and collect it on the ground through the reaching shaft, and then separate the center of the cutter head from the excavator body and collect it on the ground through the reaching shaft. A method for collecting a tunnel excavator characterized by. 9. A connecting pin for connecting a central portion of the cutter head and an outer peripheral portion of the cutter head after stopping the rotation of the cutter head after excavating the tunnel for a predetermined distance by the cutter head propelling and rotating the tunnel excavator. , The cutter head outer peripheral portion is separated from the cutter head central portion, then the cutter head central portion and the cutter driving device are separated from the excavator main body, and collected on the ground through an existing tunnel behind, A method for collecting a tunnel excavator, characterized in that the outer peripheral portion of the cutter head is collected on the ground through an existing rear tunnel.