JPH0654078B2 - Tunnel excavator with spiral cutter - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a tunnel machine equipped with a spiral cutter device, and more specifically, to a cutter bit for cutting a face when a tunnel machine is excavated by a shield machine or the like. The present invention relates to a tunnel excavator capable of cutting a hard buried object left in the ground by rotating and revolving a spiral cutter attached to a provided cutter disk.

[Conventional technology]

The reinforced concrete blocks, steel sheet piles, piles, etc. used for the foundation work of railway tracks and buildings, for example, may be buried in the ground in the center of the city and its surroundings.

Therefore, when performing tunnel construction with a tunnel machine such as a shield machine, a residual buried object is often encountered.

When such a buried object appears on the face, the tunnel machine is stopped, the air is blown inside the tunnel to make the face self-supporting, and the worker goes out of the machine to reinforce the ground by chemical injection. After that, the buried object is generally cut with a fusing machine or blown by blasting.

[Problems to be Solved by the Invention]

In the above work, the worker goes out of the machine and cuts and disassembles the buried object by a gas fusing machine, a pick, a blast, etc. in the face with reinforcement by chemical injection and self-sustaining by pressure air. After subdividing, the cut pieces are manually sent to the rear of the tunnel.

As a result, it takes a long time to process the buried object, and the excavation function and the operating rate of the tunnel excavator are reduced, which causes a problem that the construction period of the tunnel excavation becomes long. In addition, a large amount of work is required to treat the buried object, and labor is required for reinforcement work such as pressure and chemical injection as a measure for ensuring the safety of the worker, which increases tunnel excavation costs.

Incidentally, Japanese Patent Publication No. 45-12624 discloses a tunnel machine equipped with a spiral cutter suitable for cutting a face. By rotating the spiral cutter while rotating the cutter disc, it becomes possible to excavate the face with the cutter bit that performs a combined movement due to the revolution of the cutter disc and the rotation of the spiral cutter. ing.

With such a spiral cutter, the cutting face can be smoothly cut and the chips are discharged smoothly, but the cutter bit of the spiral cutter is mainly intended to cut the face face, so that it can exert the function of cutting hard buried objects. It is not normal to cut hard implants. If the cutter bit has a function of cutting a buried object, high wear resistance is required, and there is a disadvantage that cutting quality of a face where there is no buried object results in excessive quality.

Further, the spiral cutter is arranged only on the outer portion in the radial direction of the cutter disc, and even if the hard implant can be cut by the rotation of the spiral cutter, the uncut portion is left at the center of the cutter disc. There are unavoidable drawbacks. Therefore, when a hard buried object is encountered, the excavation is stopped, and the worker who has come out to the cutting face is forced to cut the buried object, causing the same problem as described above.

The present invention has been made in view of the above problems, and an object thereof is to be able to quickly cut and remove with a labor saving when an embedded object appears on a face, and a cutting suitable for the cutting when excavating the face. When using a blade to cut a buried object, use a cutting blade that is suitable for subdividing the hard object, so as to suppress excessive wear of the cutting blade for face and avoid excessive quality. Accordingly, it is an object of the present invention to provide a tunnel excavator equipped with a spiral cutter device capable of improving an excavation function and an operating rate, thereby shortening a tunnel excavation period and reducing the cost required for excavation.

[Means for Solving the Problems]

According to the present invention, a plurality of openings are radially formed in a cutter disk that is rotated by a disk drive source on the front surface of a shield body, and a cutting face cutting bit provided in each of the openings is revolved by the rotation of the cutter disk and excavated. It is applied to tunnel excavators designed to take in scraps from the opening.

The feature is that, with reference to FIG. 1, among the openings 3 of the cutter disk 2, some long openings 3, 3 extending from the substantially central portion of the cutter disk 2 to the vicinity of the peripheral edge are
A cutter drum 13 which is rotated by a drum drive source 15 independent of the disc drive source 4 is arranged over substantially the entire length of the opening 3. On the cutter drum 13, a large number of buried object cutter bits 10a, 10a are arranged in a spiral shape to form the spiral cutter 10.

The spiral formed by the buried object cutter bits 10a, 10a is a cutter drum 1 whose rotation is stopped at a predetermined position.
When it is discontinuous on the face facing the cutting face 3 and there is no buried object in the cutting face 9, by burying the spiral discontinuous portion 10m (see FIG. 3) of the cutter bit 10a for a buried object toward the cutting face 9, the buried face is buried. Cutting face cutter bit 2a in a state in which the object cutter bit 10a is not projected from the cutter face 10A.
When the cutting face 9 is cut by (see FIG. 2) and there is a buried object on the cutting face 9, the spiral cutter 10 is revolved and rotated by the rotation of the cutter disc 2 and the cutter drum 13, and any one of the cutter disc surfaces is rotated. The buried object appearing at the place can be cut by the buried object cutter bits 10a, 10a which project from the cutter face 10A and rotate.

The feature of the second invention is that in addition to the above configuration,
In the spiral cutter 10, a peripheral cutter 21 that moves forward and backward in the radial direction of the cutter disk 2 and rotates integrally with the cutter drum 13 is provided at a tip portion 13 of the cutter drum 13.
b.

A plurality of peripheral cutter bits 21 are provided around the peripheral cutter 21.
a and 21a are arranged, and the arrangement is discontinuous on the face facing the face of the cutter drum 13 whose rotation is stopped at a predetermined position. When there is no buried object in the cutting face 9, the discontinuous part 21m (see FIG. 3) of the spiral discontinuous portion 10m of the buried object cutter bit 10a and the peripheral cutter bit 21a is arranged on the cutting face 9. By facing, the cutting face 9 is cut by the cutting face cutting bit 2a in a state in which the buried object cutting bit 10a and the peripheral cutting bit 21a are not projected from the cutting faces 10A, 21A.

On the other hand, when there is a buried object in the face 9, the spiral cutter 10 and the peripheral cutter 21 are revolved and revolved by the rotation of the cutter disk 2 and the cutter drum 13, so that any place on the cutter disk surface or the outer circumference of the cutter disk 2 can be obtained. Cutter faces 10A and 21 even for buried objects appearing in the vicinity
A cutter bit 10a for a buried object which protrudes from A and rotates,
10a and the peripheral cutter bits 21a, 21a enable cutting.

[Work]

When the drum drive source 5 is stopped and the disc drive source 4 is rotated, the cutter disc 2 rotates and the cutting face cutter bit 2a excavates the cutting face 9. At that time, since the spiral cutter 10 which rotates together with the cutter disk 2 does not rotate, the face 9 is not excavated by the spiral cutter 10.

When a buried object appears on the face 9, the drum drive source 15 is rotated to rotate the spiral cutter 10 and rotate the spiral cutter 1.
In addition to rotation, 0 revolves along with the rotation of the cutter disk 2 to cut a hard buried object.

Any buried object appearing on any part of the cutter disk surface will be cut by the buried object cutter bit 10a protruding and rotating from the cutter face 10A, during which the face cutter bit 2a can cut a hard buried object. Absent.

While such an operation is repeated, cutting of a hard buried object by the cutting face cutter bit 2a is avoided, and the tunnel machine 1 can excavate a tunnel efficiently.

In the second invention, when the drum drive source 15 is stopped and the disk drive source 4 is operated, the peripheral cutter 21 is left retracted inward in the radial direction of the shield body 1A. Moreover, both the spiral discontinuity portion 10m of the buried object cutter bit 10a and the discontinuity portion 21m of the arrangement of the peripheral cutter bit 21a are faced to the face 9.

Therefore, the spiral cutter 10 and the peripheral cutter 2
Since No. 1 does not protrude from the cutter faces 10A and 21A, only the cutting face cutter bit 2a excavates the cutting face 9.

When the buried object appears on the face, rotate the drum drive source 15,
Moreover, the peripheral cutter 21 is advanced outward in the radial direction of the shield body 1A. The spiral cutter 10 and the peripheral cutter 21 revolve along with the rotation of the cutter disk 2 in addition to the rotation, and the embedded cutter bit 10 and the peripheral cutter bit 21a protruding from the cutter faces 10A and 21A cut the embedded object. However, the cutting face cutter bit 2a does not cut a hard buried object in the meantime.

〔The invention's effect〕

According to the present invention, a cutter disk of a tunnel machine,
A spiral cutter is provided that has a cutter drum with a spirally mounted cutter bit mounted radially, and the cutter drum is driven by a drum drive source independent of the disc drive source that rotates the cutter disc. By the rotation of the blade and the revolution of the spiral cutter by the rotation of the cutter disc, the spiral cutter can cut the buried object appearing on the face. Therefore, the wear of the cutting blade bit for a face, which is not suitable for cutting a hard buried object, is reduced, while the cutting tool bit for a buried object suitable for cutting is quickly cut and subdivided.

There is no need for the worker to go out of the machine as in the past, and the labor is saved by eliminating the work such as air pressure inside the tunnel mine to make the face independent and chemical injection to reinforce the ground. Is planned. Due to the existence of the buried cutter bit, high wear resistance is no longer required for the face cutter bit,
By properly using the cutter bit depending on the presence or absence of a buried object, it is possible to suppress the wear of the cutting face cutter bit and significantly extend the life. As a result, the operating rate and excavation function of the tunnel machine are improved, and the construction period and cost of tunnel excavation can be shortened.

In the second invention, in addition to the configuration of the first invention, a peripheral cutter that advances and retreats in the radial direction of the tunnel machine is provided at the tip portion of the cutter drum, and is attached to the cutter drum and the peripheral cutter. Since the cutter bit is removed around a part, if there is a buried object on the cutting face, rotate the spiral cutter and peripheral cutter to reduce the burden on the cutting face cutting bit, and there is no buried object on the cutting face. In this case, the cutter bits for the buried object and the peripheral cutter bit are not projected from the cutter face, so that the cutter bits can be used properly.

Due to the presence of the embedded cutter bit and the peripheral cutter bit, it is possible to cut and remove the obstruction in a wide range including the embedded matter appearing in the vicinity of the outer periphery of the cutter disk. As a result, the operating rate and excavation function of the tunnel machine are enhanced, and the shortening of the construction period and the reduction of the construction cost are significantly promoted.

〔Example〕

Hereinafter, the present invention will be described in detail based on its embodiments with reference to the drawings. FIG. 1 is a front sectional view of a tunnel excavator 1 such as a shield excavator equipped with the spiral cutter device of the present invention. This is the shield body 1
A plurality of openings 3, 3 of the cutter disk 2 rotated by the disk drive source 4 in front of A (see FIG.
Individual pieces) are formed radially, and the cutting face cutter bits 2a, 2a (see FIG. 2) provided in each of the openings 3 are revolved by the rotation of the cutter disk 2 so that the excavated slits are taken in from the openings 3. Has become.

The cutter disk 2 is rotated by the power from a hydraulic motor, which is a disk drive source 4, being transmitted through a ring gear 6, a rotating member 7, and an arm 8 which mesh with a pinion 5. When the cutter bit 2a for cutting face cuts the face 9 by the rotation of the cutter disk 2, the excavated earth and sand is taken into the inside of the shield body 1A through the opening 3 and conveyed to the rear of the tunnel by a conveyor or a mud pipe not shown. It has become.

As shown in FIG. 2, among the openings 3, 3 of the cutter disk 2, some long openings 3, 3 extending from the substantially central portion of the cutter disk 2 to the vicinity of the peripheral edge are independent of the disk drive source 4. The cutter drum 13 rotated by the drum driving source 15 (see FIG. 1) is arranged over substantially the entire length of the opening 3.

That is, a plurality of sets (four sets in the drawing) of rotatable cutter drums 13 are arranged in an X-shape of the radiation, and a large number of cutter bits 10a, 10 for the buried objects are arranged on the cutter drums 13.
a is arranged in a spiral shape, and the spiral cutter 10
Are configured. And each cutter drum 13 has a first
Four gears that mesh with the main bevel gear 11 shown (shown as 1
It is connected to the individual bevel gear 12 and can rotate.

In this example, the cutter drum 13 is formed by an inner peripheral side drum 13A and an outer peripheral side drum 13C, and an inner peripheral side drum 13B and an outer peripheral side drum 13D, which are divided in the radial direction. Are connected via.

By the way, the inner drum 13 located near the machine axis 1m
The lengths of A and 13B are different from each other so that the positions of the connecting members 20 are not the same in the radial direction. That is, the connecting member 20 has the embedded cutter bit 10a.
Is not attached, so drums 13A, 1
By changing the length of 3B, the uncut portion of the buried object appearing on the face 9 is not left.

Inside the bulkhead 14 which is integral with the shield body 1A, a hydraulic motor as a drum drive source 15 which is separate from the hydraulic motor 4 for driving the disk is attached. The power of the hydraulic motor 15 is transmitted to the main bevel gear 11 via the main shaft gear 17 and the main shaft 18 meshing with the pinion 16, and is transmitted to the pair of cutter drums 13 via the respective bevel gears 12. Is capable of spinning.

The buried object cutter bit 10a is removed around a part thereof as shown in FIG. That is, the spiral formed by the buried object cutter bits 10a, 10a is discontinuous on the face facing the face of the cutter drum 13 whose rotation is stopped at a predetermined position. When the cutter drum 13 is rotated to face the discontinuous portion 10m of the spiral to the face 9, the buried cutter bit 10a will be in a retracted position and should not be projected from the cutter face 0A (see FIG. 1). You can

If there is no buried object on the face 9, a cutter bit 10 for buried object
If a is not projected from the cutter face 10A, the face 9 will not be excavated by the embedded cutter bit 10a.

On the other hand, when the cutter drum 13 is rotated, even the buried object cutter bits 10a partially discontinuously arranged are revolved by the rotation of the cutter disk 2 and rotated by the drum driving source 15 so that the face 9 is cut. It is possible to easily cut an embedded object appearing anywhere on the surface of the cutter disk. As shown in FIG. 2, since the cutter drum 13 is located in the opening 3 radially arranged in the cutter disk 2, the cut-out subdivided burial material is passed through the opening 3 to the inside of the shield body 1A. Can be taken into.

As shown in FIG. 1, there is a center disk cutter 13M mounted on a main shaft 18 rotating about a machine shaft 1m at the inner side in the radial direction of the spiral cutter 10, that is, at the center of the cutter disk 2. It is designed to rotate with 2. A center cutter bit 13a having the same shape as the buried object cutter bit 10a is attached to the center disk cutter 13M and is always projected forward from the cutter face 10A of the cutter disk 2. As a result, regardless of the presence or absence of the buried object in the face 9, the face 9 can be cut to cut the buried object.

By the way, when there is no buried object in the face 9, the buried object cutter bit 10a is the cutter face 10A as described above.
The center disk cutter 13M rotates together with the cutter disk 2 although it does not protrude further (see FIG. 3) and does not rotate. However, since the center disc cutter 13M excavates the face 9, the center disc cutter 13M lags the rotation of the cutter disc 2 due to excavation resistance because the center disc cutter 13M excavates the face 9.

At that time, the rotational force in the direction opposite to the rotation of the main bevel gear 11
And is transmitted to the hydraulic motor 15 to cause reverse rotation. By the reverse rotation of the main bevel gear 11, the bevel gear 1
When the cutter drum 13 is reversely rotated through 2, the buried object cutter bit 10a projects from the cutter face 10A.

In order to prevent this, a stopper (not shown) for advancing and retracting by a hydraulic jack is provided at the center of the cutter disc 2, and when the hydraulic jack is extended, the center disc cutter 13M and the cutter disc 2 are inserted through the stopper. And are designed to be integrated. As a result, there is no delay in the rotation of the center disk cutter 13M, and the buried object cutter bit 10a does not protrude from the cutter face 10A.

On the other hand, the four bevel gears 12 housed in the gear box 19 are connected via a shaft, and the inner drums 13A, 13A
B is rotated by the driving force of the hydraulic motor 15. The outer peripheral drums 13C and 13D, which are located far from the axle 1m, are configured to rotate integrally with the inner peripheral drums 13A and 13B via the connecting member 20.

The tip of the spiral cutter 10 having such a structure, that is, the tip portions 13 of the outer drums 13C and 13D, respectively.
At b, a peripheral cutter 21 is provided which advances and retreats in the radial direction of the cutter disk 2. The peripheral cutter 21 is displaced by a cylinder mechanism (not shown) mounted inside the connection member 20, but is integrated with the cutter drum 13 so as not to rotate.

Therefore, when the driving force from the hydraulic motor 15 is transmitted via the cutter drum 13, the buried objects located outside the diameter of the shield body 1A are arranged in a plurality of peripheral cutters around the peripheral cutter 21. It can be cut by the bits 21a and 21a.

The peripheral cutter bits 21a, 21a are partially removed around the same as the embedded cutter bit 10a of the spiral cutter 10. That is, as shown in FIG. 3, the arrangement of the peripheral cutter bits 1a and 21a is discontinuous on the face facing the face of the cutter drum 13 whose rotation is stopped at a predetermined position. When the cutter drum 13 is rotated so that the discontinuous portion 21m of the array faces the face 9, the peripheral cutter bit 21a is in a retracted state and can be prevented from protruding from the cutter face 21A (see FIG. 1). it can.

If there is no buried object in the face 9, if the peripheral cutter bit 21a is not projected from the cutter face 21A, the face 9 and the inner circumferential surface of the tunnel will not be excavated as in the case of the embedded tool bit 10a. .

By the way, the discontinuous portion 1 of the buried cutter bit 10a
It is needless to say that 0 m and the discontinuous portion 21 m of the peripheral cutter bit 21 a are arranged at the same position, and the discontinuous portions 10 m and 21 m are faced to the face 9 by rotating the main shaft 18. Done.

That is, a rotary position detector (not shown) for detecting a predetermined position in the cross section of the main shaft 18 is provided, and when the main shaft 18 is stopped when the predetermined position is detected, the embedded cutter bit 10a. Can be stopped from the cutter face 0A at a position where the peripheral cutter bit 21a does not project from the cutter face 31A.

The tunnel machine 1 equipped with the spiral cutter device having such a configuration can excavate the tunnel by cutting the buried object appearing on the face 9 as follows.

The hydraulic motor 4 shown in FIG. 1 is operated, the driving force is transmitted to the pinion 5, the ring gear 6, the rotating member 7 and the arm 8, and the cutter disk 2 is rotated. If there is no buried object in the cutting face 9, the buried product cutter bit 10a of the spiral cutter 10 and the peripheral cutter bit 21a of the peripheral cutter 21 are operated so as not to rotate, while the discontinuous portions 10m and 21m are cut face. The cutter faces 10A and 21A are arranged so as not to project from the cutter faces 10A and 21A (see FIG. 3).

In addition, the center disk cutter 13M and the cutter disk 2
Are integrated by the above-mentioned stopper, rotation delay due to excavation resistance generated when the center disk cutter 13M excavates the face 9 is prevented, and the spiral cutter 1
0 buried object cutter bit 10a and peripheral cutter 21
The peripheral cutter bit 21a of the cutter face 10A, 2
It is maintained in a state of being retracted from 1A.

In this state, the cutting face cutting bit 2a and the center cutting bit 13a excavate the cutting face 9 and press the segment ring with a shield jack (not shown) to move the shield excavator 1 forward. The excavated earth and sand is taken into the inside of the shield body 1A through the opening 3 of the cutter disk 2 and sent to the rear of the tunnel by a conveyor or a mud pipe not shown.

When a buried object such as a reinforced concrete block or a steel sheet pile appears on the face 9, the stopper is disengaged, and the hydraulic motor 15 for driving the cutter drums 13, 13 is rotated. The driving force is transmitted to the four branch shafts via the pinion 16, the main shaft gear 17, the main shaft 18, the main bevel gear 11 and the bevel gear 12 shown in FIG. 1, and as the branch shafts rotate, the spiral cutter 10, 10 and the peripheral cutters 21 and 21 rotate.

Therefore, the cutter disk 2 and the cutter drum 13
The spiral cutter 10 revolves and rotates about its own axis, and any buried object appearing on any part of the cutter disk surface is cut by the buried object cutter bits 10a, 10a protruding from the cutter face 10A and rotating.

Furthermore, if necessary, the cylinder drum (not shown) rotates the cutter drums 13C and 13D to rotate the peripheral cutter 2.
1 is advanced to the outside of the cutter disk 2 in the radial direction. As a result, the revolving and rotating peripheral cutter 21 quickly cuts and subdivides the buried object located outside the cutter disk 2.

The cut pieces are taken into the shield body 1A from the opening 3 together with the earth and sand and transported to the rear of the tunnel. When this buried object disappears, the peripheral cutter 21 is retracted by the cylinder mechanism and returned to the above-mentioned state. Face 9
If the above-described operation is repeated depending on the presence or absence of the buried object, the excavating function and the operating rate of the shield excavator 1 can be enhanced. That is, the cutting face cutting bit 2a and the buried object cutting bit 10a or the peripheral cutting bit 21a are used properly, the cutting face cutting bit 2a does not cut a hard buried object, and the wear is reduced, so that the construction period of tunnel excavation is reduced. And the excavation cost can be reduced.

In the above-described embodiment, the buried object cutter bit 10 is used.
Although the a and peripheral cutter bits 21a are rotated in one direction for cutting (see FIG. 2), it is mentioned that a reversible cutter bit for bidirectional cutting can be adopted. There is no end.

[Brief description of drawings]

FIG. 1 is a front longitudinal section of a shield machine equipped with the spiral cutter device of the present invention, which is taken along line II in FIG.
FIG. 2 is a front view of the cutter disk, FIG. 3 is a layout view of a buried cutter bit or a peripheral cutter bit according to the present invention, and FIG. 4 is a cutter bit attached to a cutter drum. FIG. 1 ... Tunnel excavator (shield excavator), 1A ... Shield body, 2 ... Cutter disc, 2a ... Facet cutter bit, 3 ... Opening, 4 ... Disc drive source (hydraulic motor), 9 ... ... face, 10 ... spiral cutter, 1
0A: Cutter face, 10a: Cutter bit for buried object, 10m: Discontinuous portion of spiral, 13, 13
A to 13D ... Cutter drum, 13b ... Tip part, 1
5 ... Drum drive source (hydraulic motor), 21 ... Peripheral cutter, 21A ... Cutter face, 21a ... Peripheral cutter bit, 21m ... Discontinuous portion of array.

Claims (2)

[Claims] 1. A plurality of openings are radially formed in a cutter disk which is rotated by a disk drive source on the front surface of a shield body, and a cutting face cutting bit provided in each of the openings is revolved by the rotation of the cutter disk. In a tunnel excavator adapted to take in excavated slits from the opening, the disk drive is provided in some of the openings of the cutter disk extending from a substantially central portion of the cutter disk to a vicinity of a peripheral edge. A cutter drum that is rotated by a drum drive source independent of the source is arranged over substantially the entire length of the opening, and a large number of buried object cutter bits are spirally arranged on the cutter drum to form a spiral cutter. The spiral formed by the above-mentioned buried object cutter bit is
If the face of the cutter drum, whose rotation is stopped at a predetermined position, is discontinuous on the face facing the face and there is no buried object, the discontinuity part of the spiral of the cutter bit for buried object is directed to the face. , Cutting the cutting face with the cutting face cutting bit in a state where the cutting face cutting tool bit does not protrude from the cutter face, and if there is a buried face on the cutting face, revolve the spiral cutter by rotating the cutting disc and the cutting drum. And a tunnel excavator equipped with a spiral cutter device, which is capable of rotating and rotating an embedded object appearing anywhere on the surface of a cutter disk by the embedded cutter bit for rotation protruding from the cutter face. . 2. A plurality of openings are radially formed in a cutter disk that is rotated by a disk drive source on the front surface of the shield body, and a cutting face cutter bit provided in each of the openings is revolved by the rotation of the cutter disk. In a tunnel excavator adapted to take in excavated slits from the opening, the disk drive is provided in some of the openings of the cutter disk extending from a substantially central portion of the cutter disk to a vicinity of a peripheral edge. A cutter drum that is rotated by a drum drive source independent of the source is arranged over substantially the entire length of the opening, and a large number of buried object cutter bits are spirally arranged on the cutter drum to form a spiral cutter. The spiral formed by the above-mentioned buried object cutter bit is
The rotation of the cutter drum is stopped at a predetermined position and is discontinuous at the face facing the face, and the spiral cutter has a peripheral cutter that moves forward and backward in the radial direction of the cutter disk and rotates integrally with the cutter drum. A plurality of peripheral cutter bits are provided around the peripheral cutter at the tip of the cutter drum, and the arrangement is on the face facing the face of the cutter drum whose rotation is stopped at a predetermined position. When the face is discontinuous and there is no buried object, the discontinuity part of the spiral of the cutter bit for the buried object and the discontinuity part of the arrangement of the peripheral part cutter bit are directed to the face, and When the cutting face is cut with the cutting face cutting bit in a state where the cutting bit and the peripheral cutting bit are not projected from the cutting face, and there is a buried object in the cutting face,
The spiral cutter and the peripheral cutter are revolved and rotated by the rotation of the cutter disk and the cutter drum, and any buried matter appearing anywhere on the cutter disk surface or in the vicinity of the outer circumference of the cutter disk is rotated by projecting from the cutter face. A tunnel excavator equipped with a spiral cutter device characterized in that it can be cut by a material cutter bit and a peripheral cutter bit.