JP3500082B2 - Tunnel excavator - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tunnel excavator such as a tunnel boring machine or a shield excavator that excavates the ground to construct a tunnel.

[0002]

2. Description of the Related Art A general tunnel boring machine is
A cutter head that can be driven and rotated is attached to the front of the cylindrical front body, and a large number of roller cutters for excavating rock are attached to the front of the front head, and the front body is pressed against the inner wall surface of the existing tunnel. Then, a front gripper for holding the front body in position is attached. Further, a rear body is connected to a rear portion of the front body via a plurality of thrust jacks, and a rear gripper for pressing the inner wall surface of the existing tunnel and holding the rear body in position is attached to the rear body.

Therefore, when the rear gripper holds the rear body in position while the front gripper releases the position of the front body, the thrust heads are driven to rotate while the plurality of thrust jacks are extended. The front body moves forward while excavating the rock in front. Then, when the thrust jack extends for a predetermined stroke, the front gripper holds the front body in position while the rear gripper releases the position of the rear body, and in this state,
When the plurality of thrust jacks are contracted, the rear body is pulled toward the front body to move forward. After that, in the same manner as described above, the rear gripper holds the position of the rear body while the front gripper releases the position of the front body, and the plurality of thrust jacks are extended while driving the cutter head to excavate the rock mass in front. By repeating this, a tunnel of a predetermined length is constructed.

However, in such a conventional tunnel boring machine, the cutter head has a disk shape and is rotatably mounted on the front body of the machine. The rock is excavated by pressing the cutter against the rock in front to form a tunnel. Therefore, the rolling distance of the roller cutter on the outer peripheral side farther from the center of rotation of the cutter head increases, and the wear of these roller cutters is remarkable. on the other hand,
Since the rotation diameter of the roller cutter on the rotating side of the cutter head is small, these roller cutters are likely to be damaged by rocking the rock on the side surface.

Further, tunnels to be excavated and formed include those used by railways and automobiles, as well as underpasses in stations, sewers, etc. The cross section of the tunnel is not only circular but also elliptical, square, horseshoe-shaped, etc. Has become.
However, the conventional TBM described above cannot excavate and form a tunnel having such an irregular cross section.

An example of an excavable tunnel having an irregular cross section is disclosed in Japanese Patent Laid-Open No. 5-321588. "Underground excavator" disclosed in this publication
Arranges a rectangular cutter head frame in the front part of the shield cylinder, arranges a plurality of roller cutters on the cutter head frame at predetermined intervals, and mounts rotating bodies at the four corners of the shield cylinder to remove the eccentric portion. The cutter head frame is connected to the support shaft. Therefore, when the rotating bodies are synchronously rotated by the drive motor, the supporting shaft is rotated, whereby the cutter head frame is rotated in parallel link, and a tunnel having a rectangular cross section can be excavated.

[0007]

However, in the "underground excavator" of the above-mentioned publication, when the shield cylinder moves forward while the cutter head frame rotates, it rotates on the front surface of the cutter head frame. The freely mounted roller cutter is pressed against the face to crush the face and excavate the tunnel. Since this roller cutter is mounted using the pedestal, it cannot be mounted along the outer peripheral portion of the cutter head frame. Therefore, an excavator different from the roller cutter, such as a cutter bit, is fixed to the outer peripheral portion of the cutter head frame. Then, the excavation resistance increases and the excavation efficiency decreases, and since the excavation tool is fixed, wear and damage occur and replacement is required, which not only leads to high cost,
There is a problem that the excavation workability is reduced.

The present invention is intended to solve such a problem, and it is possible to properly excavate a tunnel having a predetermined cross section without attaching a special excavator to the outer peripheral portion and prevent early wear or damage of the cutter. The purpose of the present invention is to provide a tunnel excavator.

[0009]

In order to achieve the above object, a tunnel excavator according to the invention of claim 1 has a tubular excavator main body and a cutter head mounted on the front part of the excavator main body. A first cutter attached to a substantially central portion of the front surface of the cutter head and capable of excavating the front ground; and a front cutter which is pivotally attached to the outer peripheral portion of the front surface of the cutter head at an angle to one to excavate the front ground. a second cutter, an eccentric oscillating drive mechanism for eccentrically oscillating the cutter head relative to the excavator body within the excavating surface, the eccentric rocking by eccentric swinging drive mechanism when the eccentric orbiting movement of the cutter head The rotational force of the dynamic drive mechanism is
2 Transmitted to the cutter and rotated so as to face the inside and outside of the excavation surface
It is characterized by comprising a second cutter rotating mechanism for making it move and a propulsion means for moving the excavator body forward.

Further, in the tunnel excavator according to the invention of claim 2, the second cutter rotating mechanism is a crankshaft of the eccentric rocking drive mechanism rotatably connected to the cutter head, and the crankshaft. A drive gear fixed to the second cutter, a driven gear fixed to the rotating shaft of the second cutter, and a connecting gear drivingly connecting the drive gear and the driven gear.

Further, in the tunnel excavator according to the invention of claim 3, the second cutter rotating mechanism is a crankshaft of the eccentric rocking drive mechanism rotatably connected to the cutter head, and the crankshaft. A drive pulley fixedly attached to the second pulley;
It is characterized by having a driven pulley fixedly connected to the rotary shaft of the cutter and a transmission belt drivingly connecting the drive pulley and the driven pulley.

[0012]

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 schematic cross-sectional view of a tunnel boring machine as a tunnel excavator according to a first embodiment of the present invention, FIG. 2 is a front view of the tunnel boring machine of the present embodiment, and FIG. 3 is an eccentric rocking motion of a cutter head. Is a front view of a tunnel boring machine, FIG. 4 is a schematic view showing a second cutter rotating mechanism, and FIG. 5 is a VV cross section of FIG.

In the tunnel boring machine (hereinafter, referred to as TBM) of the present embodiment, as shown in FIGS. 1 and 2, the excavator main body is composed of a front body 11 and a rear body 12 each having a cylindrical shape. The front outer circumference of the rear body 12 is relatively movable in the front-rear direction to the inner rear surface of the front body 11, and
It is fitted so as to be relatively rotatable in the circumferential direction. Cutter head 1
Reference numeral 3 denotes a disk-shaped member having a smaller diameter than the front body 11 and the rear body 12, and has a first roller cutter 14 as a first cutter and a second roller cutter as a second cutter, which shears and fractures the rock in front of the front portion. 15 is attached. This first
The roller cutter 14 is rotatably attached to the pedestal 16,
The pedestal 16 is fixed to a substantially central portion of the cutter head 13. On the other hand, the second roller cutter 15 is rotatably attached to the base 17 so as to be rotatable, and the base 17 is pivotally attached to the outer peripheral portion of the cutter head 13.

The cutter head 13 has a front body 11
On the other hand, it is supported by the eccentric rocking drive mechanism 18 so as to be eccentrically rockable in the excavation plane orthogonal to the excavation direction. That is,
Four electric or hydraulic drive motors 19 are fixed to a substantially central portion of the front case 11, and a speed reducer 20 is connected to each drive motor 19. A rotating body 21 rotated by a drive motor 19 is mounted in front of each speed reducer 20, and each rotating body 19 is connected to a cutter head 13 via a crankshaft 22. Therefore, each drive motor 1
9 and drives the rotating force of the rotating body 2 through the speed reducer 20.
1 to rotate the rotating body 21, the cutter head 13 can be eccentrically oscillated in the excavation plane via the crankshaft 22, that is, it can revolve without rotating.

When the cutter head 13 is eccentrically rocked in the excavation plane by the eccentric rocking drive mechanism 18, the second roller cutter 15 is pivoted by the second roller cutter pivot mechanism 23 in the excavation plane. It is designed to face outward. That is, as shown in FIGS. 4 and 5, the crankshaft 22 of the rotating body 19 is rotatably supported by the cutter head 13 via the bearing 24, and the drive gear 25 is fixedly connected thereto. On the other hand, the rotary shaft 26 fixed to the pedestal 17 of the second roller cutter 15
Is rotatably supported by the cutter head 13 via a bearing 27, and a driven gear 28 is fixed to the cutter head 13. A connecting gear 29 that drives and connects the drive gear 25 and the driven gear 28 is located between the drive gear 25 and the driven gear 28, and an integral rotating shaft 30 is rotatably supported by the cutter head 13 via a bearing 31. Further, the driven gears 28 of the respective second roller cutters 15 disposed adjacent to the outer peripheral portion of the cutter head 13 are connected to each other by the connecting gear 3.
The two are drive-connectable to each other.

Therefore, when the cutter head 13 is eccentrically oscillated in the excavation plane by the eccentric oscillating drive mechanism 18, the rotating body 21 and the crankshaft 2 are accompanied by the oscillating motion of the cutter head 13.
2 rotates relative to each other, the rotational force of the crankshaft 22 is transmitted to the second roller cutter 15 (base 17) via the drive gear 25, the connecting gear 29, and the driven gear 28, and further adjacent to the second roller cutter 15 via the connecting gear 32. Each second roller cutter 15
It is transmitted to the (pedestal 17) to rotate each second roller cutter 15. In this case, the second roller cutter 15 also makes one revolution with respect to one revolution of the cutter head 13. That is, when the cutter head 13 is below the front body 11 (within the excavation surface), as shown by the solid line in FIG. 3, each second roller cutter 15 faces downward. Then, as the cutter head 13 swings, each second roller cutter 15 also rotates, and the cutter head 13 moves the front head 1 as shown by the chain double-dashed line in FIG.
When it is diagonally upward and to the left of 1 (within the excavation plane), each second roller cutter 15 faces diagonally upward and to the left and right. That is, each of the second roller cutters 15 rotates so as to always face the side where the outer circumference of the cutter head 13 and the outer circumference of the front body 11 are in contact with each other.

As shown in FIG. 1, the front body 11 is provided with a bulkhead 33 for partitioning the cutter head 13 side and the drive motor 19 side so that the shear generated by excavation does not enter inside. A chamber 34 is formed between the cutter head 13 and the bulk head 33. A belt conveyor (not shown) for discharging the slip to the outside is attached to the chamber 34, and the belt conveyor extends rearward in the front body 11 and the rear body 12.

Further, a plurality of thrust jacks 35 as a propulsion means are provided between the front body 11 and the rear body 12. The thrust jacks 35 are expanded and contracted by supplying and discharging hydraulic pressure, one end of which is swingably supported by a spherical bearing 36 fixed to the front case 11, and the other end of which is fixed to the rear case 12. It is swingably supported by a spherical bearing 37. The thrust jacks 35 are arranged adjacent to each other. For example, one thrust jack 35 adjacent to each other is inclined to one side in the circumferential direction of the cutter head 13, and the other thrust jack 35 is the cutter head 13. The parallel link mechanism 3 is provided by inclining to the other side in the circumferential direction and being arranged in a truss shape as a whole.
Make up eight. The parallel link mechanism 38
The number of thrust jacks 35 constituting the
Books, eight, twelve, or more,
It may be appropriately set according to the size of the tunnel boring machine.

Therefore, by expanding and contracting the drive rods of the thrust jacks 35 of the parallel link mechanism 38, the relative positions of the front body 11 and the rear body 12 in the front-rear direction can be changed, and the rear body 12 can be moved. By extending each thrust jack 35 so that it cannot move into the existing tunnel, the rear body 1
The front body 11 can be moved forward with respect to 2, while the rear body 12 can be moved forward with respect to the front body 11 by making the front body 11 immovable in the existing tunnel and contracting the thrust jacks 35. . Further, by changing the operation stroke of the thrust jacks 35 in each set, the cutter head 13 can be moved in the circumferential direction together with the front body 11 with respect to the rear body 12. Further, by changing the operation stroke of the thrust jack 35 for each set, the rear body 1
Bending the front body 11 together with the cutter head 13 for 2,
The digging direction can be changed.

Further, the front body 11 is equipped with a front gripper (not shown) for pressing the inner wall surface of the existing tunnel to hold the front body 11 in position. On the other hand, the rear body 12 is also equipped with a rear gripper 39 which presses against the inner wall surface of the existing tunnel and holds the rear body 12 in position. Also,
A plurality of shield jacks 40 as a propelling means are arranged side by side in the circumferential direction on the rear part of the rear body 12, and the shield jacks 40 are pressed against a segment (not shown) assembled on the inner wall surface of the existing tunnel, The front body 11 and the rear body 12 can be moved forward by the reaction force. In addition,
An erector device (not shown) for assembling the segments is mounted on the rear body 12.

Here, a tunnel excavation method using the above-described tunnel boring machine of the present embodiment will be described.

As shown in FIG. 1, the rear gripper 39 is pushed outward and the outer peripheral surface is pressed against the inner wall surface of the tunnel formed by excavation, so that the drive motor 19 is driven while the rear case 12 is held immovable. Then, the rotor 21 is rotated via the speed reducer 20, and the thrust jacks 35 of the parallel link mechanism 38 are extended while the cutter head 13 is eccentrically rocked within the excavation plane via the crankshaft 22. Then, while the rear gripper 39 receives the excavation reaction force, the cutter head 13 moves forward together with the front body 11 with respect to the rear body 12, and the roller cutters 14 and 15 of the eccentric rocking cutter head 13 shear and break the rock mass. Then, excavate this bedrock.

When the cutter head 13 is swung by the eccentric swing driving mechanism 18, the second roller cutter 15 located on the outer peripheral portion of the cutter head 13 is
Is rotated so that the outer circumference of the front body 11 and the outer circumference of the front body 11 face each other. Therefore, each second roller cutter 15 is attached to the front body 11
The rock mass corresponding to the outer periphery of the
The cutter head 13 can excavate a tunnel having the same shape as the front body 11.

At the same time as the cutter head 13 is swung by the eccentric swing driving mechanism 18, the operating strokes of the thrust jacks 35 in each set of the parallel link mechanism 38 are changed to change the front trunk 11 with respect to the rear trunk 12. Alternatively, the rock head may be excavated by shearing and breaking the rock bed by each roller cutter 14 of the cutter head 13 that reciprocally rotates with eccentric rocking by reciprocally rotating the cutter head 13 in the circumferential direction.

When the cutter head 13 excavates the rock bed as the thrust jacks 35 extend in this way, a tunnel having a diameter substantially the same as the diameter of the cutter head 13 and the front body 11 and the rear body 12 is excavated. Become. At this time, by changing each operation stroke of each thrust jack 35, the front body 11 is bent with respect to the rear body 12, and the direction of the cutter head 13 can be changed to change the tunnel excavation direction. Then, when each thrust jack 35 extends for a predetermined stroke, the driving of the thrust jack 35 is stopped, the front gripper is pushed out, and the outer peripheral surface is pressed against the inner wall surface of the tunnel formed by excavation.
While holding 1 unmovable, the rear gripper 39 is retracted to make the rear body 12 movable. In this state, by contracting the thrust jacks 35 of the parallel link mechanism 38, the rear body 12 is pulled toward the front body 11 and moved forward to bring them closer.

Then, again, the rear gripper 39 is pressed against the inner wall surface of the tunnel to hold the rear body 12, while the position holding by the front gripper is released, and the cutter head 13 is eccentrically swung in the same manner as described above while the parallel movement is performed. By advancing the front body 11 and the cutter head 13 by the link mechanism 38, the rock mass is crushed by the roller cutters 14 and 15, and a tunnel of a predetermined length is excavated by repeating this operation. In addition, this cutter head 1
The shear generated by the rock excavation of the roller cutters 14 and 15 of No. 3 is taken into the chamber 34 and discharged to the outside by the belt conveyor.

As described above, in the TBM of this embodiment, the cutter head 13 is eccentrically oscillated within the excavation surface by the eccentric oscillating drive mechanism 18, and the second roller cutter rotating mechanism 23 is used by the second roller cutter. By rotating 15 so that the outer circumference of the cutter head 13 and the outer circumference of the front body 11 are in contact with each other, and at the same time, the parallel link mechanism 38 press-contacts the cutter head 13 to the rock in front, whereby each roller cutter 14 moves forward. The approximately central portion of the rock is excavated, and each roller cutter 15 excavates the outer peripheral portion of the rock in front. Therefore, it is possible to properly excavate a tunnel having the same shape as the front body 11 and the rear body 12 without fixing a special excavator to the outer peripheral portion of the cutter head 13. In addition, the cutter head 13
It is possible to excavate a tunnel having a cross section larger than that of the cutter head 13 without increasing the size of the drive motor 19 or the like, and the excavation resistance acts on each of the roller cutters 14 and 15 almost uniformly to prevent early wear or damage. It never happens.

In the TBM of this embodiment, the parallel link mechanism 38 is used as the propulsion means for the front case 11 and the rear case 12, but the excavated ground is soft and the rear gripper 39 is pressed against the inner wall surface of the tunnel. When the excavation reaction force cannot be obtained, the front jack 11 and the rear torso 12 are moved forward by obtaining the excavation reaction force from the existing segment using the shield jack 40 and the erector device mounted on the rear portion of the rear torso 12. You can also

FIG. 6 is a schematic view showing a second cutter rotating mechanism in a tunnel boring machine as a tunnel excavator according to a second embodiment of the present invention, and FIG. 7 is a sectional view taken along line VII-VII of FIG. It should be noted that members having the same functions as those described in the above-described embodiment are designated by the same reference numerals, and redundant description will be omitted.

In the TBM of the present embodiment, as shown in FIGS. 6 and 7, the second roller cutter 15 has the second roller cutter 15 when the cutter head 13 is eccentrically rocked within the excavation plane by the eccentric rocking drive mechanism 18. It is adapted to be rotated by the roller cutter rotating mechanism 51 so as to face outward in the excavation surface. That is, the crankshaft 22 of the rotating body 19 is rotatably supported by the cutter head 13 via the bearing 24, and the drive pulley 52
Is consolidated. On the other hand, the rotary shaft 26 fixed to the pedestal 17 of the second roller cutter 15 is rotatably supported by the cutter head 13 via a bearing 27, and the driven pulley 53 is fixedly attached thereto. Then, the drive pulley 52 and the driven pulley 5
3 is an endless transmission belt 54 for drivingly connecting the two.
Is hung around. Further, the driven pulleys 52 of the respective second roller cutters 15, which are arranged adjacent to the outer peripheral portion of the cutter head 13, are driven by the transmission belt 55 so as to be drive-coupled to each other.

Therefore, when the cutter head 13 is eccentrically oscillated in the excavation plane by the eccentric oscillating drive mechanism 18, the rotating body 21 and the crankshaft 2 are accompanied by the oscillating operation of the cutter head 13.
As a result, the rotational force of the crankshaft 22 is transmitted to the second roller cutter 15 (base 17) via the drive pulley 52, the transmission belt 54, and the driven pulley 53.
Further, it is transmitted to the adjacent second roller cutters 15 (bases 17) via the transmission belt 55, and the respective second roller cutters 1
Rotate 5. In this case, the second roller cutter 15 also makes one revolution with respect to one revolution of the cutter head 13. In this case, each of the second roller cutters 15 rotates so as to always face the side where the outer circumference of the cutter head 13 and the outer circumference of the front body 11 are in contact with each other.

As described above, in the second roller cutter rotation mechanism 51 applied to the TBM of this embodiment, the eccentric oscillating drive mechanism 18 causes the cutter head 13 to eccentrically oscillate within the excavation plane, and By the two-roller cutter rotating mechanism 51, the second roller cutter 15 is rotated so as to face the side where the outer circumference of the cutter head 13 and the outer circumference of the front body 11 are in contact,
At the same time, the parallel link mechanism 38 enables the cutter head 1
By pressing 3 to the rock in front, each roller cutter 14
Excavates the approximately central part of the rock mass in front, and each roller cutter 15
Excavates the outer periphery of the rock ahead. Therefore, it is possible to properly excavate a tunnel having the same shape as the front body 11 and the rear body 12 without fixing a special excavator to the outer peripheral portion of the cutter head 13. Then, the second roller cutter rotating mechanism 51
By using the pulleys 52 and 53 and the belts 54 and 55 for the rotor, the degree of freedom of the arrangement position of the second roller cutter 15 with respect to the rotating body 21 and the crankshaft 22 is increased, and the shape and size of the cutter head 13 can be changed. On the other hand, the number of second roller cutters 15 and the mounting positions thereof can be easily designed.

In each of the above-mentioned embodiments, the drive source of the second cutter rotating mechanism 23, 51 is the eccentric rocking drive mechanism 18, but a separate drive source is separately provided to the cutter head 13. The drive may be controlled so as to be synchronized with the swing of the.

In each of the above-described embodiments, the cutter head 13 is eccentrically oscillated so that the circular cross-section tunnel having a diameter substantially larger than the diameter of the cutter head 13 is substantially the same as the diameter of the front body 11 and the rear body 12. However, by forming the cutter head 13 into an elliptical shape, a quadrangular shape, a horseshoe shape, or the like, a tunnel having an irregular cross section can be excavated.

Further, in each of the above-mentioned embodiments, the tunnel excavator of the present invention has been described by using the tunnel boring machine for crushing rock to excavate a tunnel.
The present invention is not limited to this type of excavator, and can also be applied to a shield excavator for excavating soft and high-moisture ground, and as a matter of course, the same effect as described above can be obtained. You can

[0037]

As described above in detail in the embodiments, according to the tunnel excavator of the invention of claim 1, the first cutter is provided substantially in the center of the front face of the cutter head mounted on the front part of the excavator body. And a second cutter which is inclined to one side is pivotally attached to the outer peripheral portion of the front surface, the eccentric oscillating drive mechanism allows the cutter head to eccentrically oscillate in the excavation plane, and the second cutter rotating mechanism causes the cutter to rotate. During the eccentric rocking motion of the head, the rotational force of the eccentric rocking drive mechanism is transmitted to the second cutter.
Since the cutting head reaches the inside and outside of the excavation surface , the cutter head eccentrically swings within the excavation surface by the eccentric swing drive mechanism, and the second cutter rotates by the second cutter rotation mechanism to move inside and outside the excavation surface. When the excavator body moves forward, the cutters of the cutter head will surely excavate a proper excavation range, and without fixing a special excavator to the outer periphery of the cutter head, It is possible to properly excavate the tunnel and prevent early wear and damage of the cutter.

According to the tunnel excavator of the second aspect of the present invention, the second cutter rotating mechanism is fixedly connected to the crankshaft of the eccentric rocking drive mechanism rotatably connected to the cutter head. On the other hand, since the driven gear is fixedly coupled to the rotary shaft of the second cutter and the drive gear and the driven gear are drive-connected by the connecting gear, the second cutter can be easily synchronized with the cutter head with a simple structure. It can rotate and
The drive can be controlled with high accuracy.

According to the third aspect of the tunnel excavator of the present invention, the second cutter rotating mechanism is fixed to the crankshaft of the eccentric rocking drive mechanism rotatably connected to the cutter head. On the other hand, since the driven pulley is fixedly coupled to the rotary shaft of the second cutter and the drive pulley and the driven pulley are drivingly connected by the transmission belt, the position of the second cutter relative to the rotating body and the crankshaft can be freely set. The greater the
It is possible to easily design the number and the mounting position of the second cutters with respect to changes in the shape and dimensions of the cutter head.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a tunnel boring machine as a tunnel excavator according to a first embodiment of the present invention.

FIG. 2 is a front view of the tunnel boring machine of the present embodiment.

FIG. 3 is a front view of a tunnel boring machine showing an eccentric swing motion of a cutter head.

FIG. 4 is a schematic view showing a second cutter rotation mechanism.

5 is a sectional view taken along line VV of FIG.

FIG. 6 is a schematic view showing a second cutter rotating mechanism in a tunnel boring machine as a tunnel excavator according to a second embodiment of the present invention.

7 is a sectional view taken along line VII-VII of FIG.

[Explanation of symbols]

11 front torso 12 rear body 13 cutter head 14 First roller cutter 15 Second roller cutter 18 Eccentric swing drive mechanism 19 Drive motor 21 rotating body 22 crankshaft 23 Second cutter rotation mechanism 25 drive gear 28 Driven gear 29, 32 coupling gear 35 Thrust jack (propulsion means) 38 Parallel Link Mechanism (Propulsion Means) 40 Shield jack (propulsion means) 51 Second cutter rotation mechanism 52 Drive pulley 53 Driven pulley 54,55 transmission belt

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Tomohiro Akagi, Tomohiro Akagi 2-1-1, Niihama, Arai-cho, Takasago, Hyogo Prefecture Mitsubishi Heavy Industries, Ltd. Takasago Research Institute (72) Yoshihiro Oishi 2-5-1 Marunouchi, Chiyoda-ku, Tokyo No. Mitsubishi Heavy Industries Ltd. (72) Inventor Tsutomu Tomizawa 1-24-4 Shinkawa, Chuo-ku, Tokyo Otoyo Construction Co., Ltd. (72) Inventor Kazuhiko Kanai 1-24-4 Shinkawa, Chuo-ku, Tokyo Otoyo Construction Co., Ltd. In-company (72) Inventor Haruo Hasegawa 1-24-4 Shinkawa, Chuo-ku, Tokyo Inside Daitoyo Construction Co., Ltd. (56) Reference JP-A-10-238286 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E21D 9/087

Claims (3)

(57) [Claims] 1. A tubular excavator main body, a cutter head attached to a front portion of the excavator main body, and a first excavator capable of excavating a ground in front of the cutter head, which is attached to a substantially central portion of a front surface of the excavator main body.
A cutter, and a second cutter that is pivotally attached to the outer peripheral portion of the front surface of the cutter head in one direction and is capable of excavating the ground in front,
An eccentric oscillating drive mechanism for eccentrically oscillating the cutter head relative to the excavator body within the excavating surface, the eccentric rocking by eccentric swinging drive mechanism when the eccentric orbiting movement of the cutter head
The excavation is transmitted by transmitting the rotational force of the dynamic drive mechanism to the second cutter.
A tunnel excavator, comprising: a second cutter rotating mechanism that rotates so as to face the inside and outside of the cutting surface; and a propulsion unit that advances the excavator body. 2. The tunnel excavator according to claim 1, wherein the second cutter rotating mechanism includes a crankshaft of the eccentric rocking drive mechanism that is rotatably connected to the cutter head, and the crankshaft. A tunnel excavator, comprising: a drive gear that is fixedly coupled, a driven gear that is fixed to a rotating shaft of the second cutter, and a connecting gear that drive-connects the drive gear and the driven gear. 3. The tunnel excavator according to claim 1, wherein the second cutter rotation mechanism includes a crankshaft of the eccentric rocking drive mechanism that is rotatably connected to the cutter head, and the crankshaft. A drive pulley fixedly connected to the second drive pulley;
A tunnel excavator comprising: a driven pulley fixed to a rotary shaft of a cutter; and a transmission belt drivingly connecting the drive pulley and the driven pulley.