JP2000008779A - Shield machine for rectangular tunnel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make overbreak of corner parts of a rectangular tunnel possible by providing a copy cutter device to one of a pair of planetary cutters which revolve with rotation synchronously with a disc and excavate the rectangular- section tunnel by the rotation speed ratio of revolution to rotation. SOLUTION: A cutter disc 2 for a shield machine 1 is provided with a disc main body 4, a pair of planetary cutters 5, and a cutter drum. A main cutter 4a is provided in the front end of the disc main body 4 so as to be rotated integrally. The respective planetary cutters 5 are rotated on their own axis interlocked with the disc main body 4. The outline shape of the planetary cutter 5 is formed into a leaf shape based on the speed of the revolution and the rotation of the planetary cutter 5 and a plurality of cutter bits 5a are projectingly provided along the external shape of the leaf at prescribed intervals. A first copy cutter device 51 is provided in one of a pair of the planetary cutters 5 so as to perform overbreak of the four corners of the rectangular tunnel outward and a second copy cutter device is provided to the other so as to perform overbreak of the adjacent to the both sides of the corners outward, thereby eliminating any necessity of enlarging the device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield tunneling machine for a rectangular tunnel, and more particularly, to a machine for excavating a tunnel having a rectangular cross section by providing a disk body with a planetary cutter which revolves while rotating in synchronization with the rotation of the disk body. The present invention relates to a planetary cutter provided with a copy cutter device.

[0002]

2. Description of the Related Art A shield excavator is widely used as a drilling device for constructing various shield tunnels (water and sewage tunnels, subway tunnels, communication cable tunnels, tunnels for common ditch, etc.) by a shield method. ing. A typical shield machine is configured to excavate a circular section tunnel. However, in recent years, a shield tunneling machine for a rectangular tunnel capable of excavating a tunnel having a rectangular cross section has been proposed and studied for practical use.

For example, in a shield machine described in Japanese Patent Application Laid-Open No. H10-61382, a body member having a rectangular cross section on a front side and a shield frame having a rectangular cross section connected to a rear end are provided as skin plates. A cutter disk, and a cutter rotation driving means for driving the cutter disk to rotate. The cutter disk is mounted on the disk body and the disk body, and a pair of planets revolve while rotating in synchronization with the rotation of the disk body. And a cutter.

[0004] A planetary gear mechanism for rotating the planetary cutter in conjunction with the rotation of the disk body is provided, and the contour of the planetary cutter is formed in accordance with the ratio between the rotational speed and the revolutional speed of the planetary cutter to obtain a rectangular shape. The cross section tunnel can be excavated. In this shield machine, the ratio between the rotation speed and the revolution speed of the planetary cutter is set to 4: 1, and a circular cross section at the center of the tunnel is excavated by the main cutter of the disk body. The part is excavated with a pair of planetary cutters.

[0005] The shield excavator is provided with a copy cutter device for excavating an outer peripheral portion of the tunnel when the tunnel is excavated in a curved shape. A conventional copy cutter device includes a copy cutter and a hydraulic cylinder that drives the copy cutter forward and backward, and is mounted on one of the cutter spokes of a cutter disk. No specific copy cutter device has been proposed for the shield tunneling machine for a rectangular tunnel disclosed in the above publication.

Therefore, similarly to a conventional ordinary shield machine, a plurality of main cutter spokes are provided on a cutter disk, and a copy cutter device is provided on any of the main cutter spokes. By performing the stroke control of the hydraulic cylinder of the copy cutter device so as to be adapted, it is conceivable that the copy cutter device performs overdigging over the entire circumference of the rectangular cross-section tunnel.

[0007]

As described above, in the shield tunneling machine for a rectangular tunnel, when the main cutter spoke is provided with a copy cutter device, the projecting length of the copy cutter device at each corner of the rectangular cross-section tunnel is reduced. Since the size of the copy cutter becomes very large, if the copy cutter body is made thick and has high rigidity, and the size of the main cutter spokes is increased accordingly, the copy cutter device and the cutter disk become large, and the production cost becomes high.

SUMMARY OF THE INVENTION It is an object of the present invention to realize a copy cutter device capable of rationally excavating a corner of a tunnel in a shield tunneling machine for a rectangular tunnel, and rationally exposing a portion near both sides of the corner of the tunnel. The objective is to realize a copy cutter device that can be dug, and to realize a copy cutter device that can rationally dug the straight lines at the top, bottom, left, and right of a tunnel.

[0009]

According to a first aspect of the present invention, there is provided a shield tunneling machine for a rectangular tunnel, comprising: a cutter disk; and a cutter rotation driving unit for rotating the cutter disk. The cutter disk is mounted on the disk body and the disk body. And a pair of planetary cutters that revolve while rotating in synchronization with the rotation of the disk main body, and a planetary gear mechanism that rotates the planetary cutter in synchronization with the rotation of the disk main body. In a shield machine capable of excavating a rectangular cross-section tunnel formed according to the ratio between the rotation speed and the revolution speed of the planetary cutter, one of the planetary cutters can be dug outside the corner of the rectangular cross-section tunnel. A first copy cutter device is provided.

When the cutter disk is driven to rotate by the cutter rotation driving means during tunnel excavation, the disk body rotates and the planetary cutter revolves while rotating through the planetary gear mechanism, so that the contour shape of the planetary cutter is changed. When properly set, the tunnel having a rectangular cross section is excavated when the ratio between the rotation speed of the planetary cutter and the rotation speed of the planetary cutter is 4: 1.

[0011] Since one of the pair of planetary cutters is provided with the first copy cutter device capable of excavating the corners of the tunnel with a rectangular cross section outward, the tunneling direction of the tunnel is changed to the left or right. When the first copy cutter device is switched to the digging position in the case of bending in the upward direction, the four corners of the tunnel are dug out to the outside. As described above, since the first copy cutter device is provided in the planetary cutter for excavating the corner of the tunnel and the vicinity thereof, the copy cutter device is enlarged without the projection stroke of the copy cutter device becoming excessively large. Not even.

According to a second aspect of the present invention, there is provided a shield tunnel machine for a rectangular tunnel, wherein
The present invention is characterized in that a pair of second copy cutter devices are provided, which are capable of excavating outside portions near both sides of the corners of the rectangular cross-section tunnel. When the pair of second copy cutter devices is switched to the excavation position in the case where the excavation direction of the tunnel is curved leftward or rightward, extraneous portions near both sides of the four corners of the tunnel are externally dug. .

As described above, since the pair of second copy cutter devices is provided on the planetary cutter for excavating the corner of the tunnel and the vicinity thereof, the projecting stroke of the copy cutter device does not become excessive, and the copy is performed without excessively increasing the copy stroke. There is no increase in the size of the cutter device. Moreover, since the first copy cutter device is provided on one planetary cutter and the pair of second copy cutter devices is provided on the other planetary cutter,
The excavation load of the pair of planetary cutters can be made as uniform as possible.

According to a third aspect of the present invention, there is provided a shield tunnel machine for a rectangular tunnel according to the second aspect of the present invention, wherein a plurality of main cutter spokes are provided on the disk main body, and one of the main cutter spokes is a straight line in the vertical and horizontal directions of the tunnel having a rectangular cross section. A main copy cutter device is provided, which can be dug outside. When the disk body rotates, the plurality of main cutter spokes also rotate to excavate a circular cross section of the rectangular cross section tunnel. When the main copy cutter device is switched to the excavation position when bending the tunnel excavation direction, the upper, lower, left and right straight portions of the rectangular cross-section tunnel are dug outside.

The upper, lower, left and right straight portions of the rectangular cross section tunnel
In view of the fact that the main section is not greatly separated from the outer circumference of the circular section, a main copy cutter device is provided on any of the main cutter spokes so that the upper, lower, left and right linear sections of the rectangular section tunnel can be dug outside. Therefore, the protrusion stroke of the main copy cutter device does not become excessive, and the size of the main copy cutter device does not increase.

According to a fourth aspect of the present invention, there is provided a shield tunnel machine for a rectangular tunnel according to the second aspect, wherein the first copy cutter device has a copy cutter and a first hydraulic cylinder for driving the copy cutter forward and backward. The second copy cutter device includes a copy cutter and a second hydraulic cylinder that drives the copy cutter forward and backward. When performing overhaul, first,
The second hydraulic cylinder switches the first and second copy cutter devices to the digging positions and performs digging.

According to a fifth aspect of the present invention, there is provided a shield tunnel machine for a rectangular tunnel according to the third aspect, wherein the main copy cutter device has a main copy cutter and a main hydraulic cylinder for driving the main copy cutter forward and backward. A control means for controlling the stroke of the hydraulic cylinder is provided.

When the main copy cutter device corresponds to one end of the upper, lower, left and right straight portions of the rectangular cross-section tunnel during the overrun, the advance stroke of the main hydraulic cylinder is maximized, and then the center of the straight portion is adjusted. , The advance stroke is gradually reduced, and the advance stroke is gradually increased from the center of the straight portion to the other end of the straight portion. In this manner, it is possible to dig the parallel section of the rectangular section tunnel in parallel with the upper, lower, left and right straight portions.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. As shown in FIGS. 1 and 2, the shield machine 1 according to this embodiment has a shield frame 1a as a trunk member and a trunk member 1b in front of the shield frame 1a. The body member 1b is connected to the body member 1b via a center bent portion and a plurality of center bent jacks 30. The cutter disk 2 is provided on the front side of the body member 1b. The cutter disk 2 includes a disk body 4, a pair of planetary cutters 5 mounted on the disk body 4, and an annular cutter drum 3 connected to the disk body 4 via a plurality of connecting members 4b. .

A cutter rotation drive mechanism 6 for rotating the disk body 4 and the cutter drum 3 is provided. A main cutter 4a is provided at the front end of the disk body 4, and the main cutter 4a rotates integrally with the disk body 4. It is configured to be. A planetary gear mechanism 7 for rotating each planetary cutter 5 in synchronization with the rotation of the disk main body 4, that is, the rotation of the cutter drum 3, is provided inside the cutter drum 3.
The planetary cutter 5 is formed in a leaf shape according to the ratio between the rotation speed and the revolution speed of the planetary cutter 5. Each planetary cutter 5
A plurality of cutter bits 5a are protruded at predetermined intervals along the leaf-shaped outer shape of the tree, and an opening 5b for introducing earth and sand excavated by each cutter bit 5a into the chamber 8 is provided.
Are also formed. Of course, the main cutter 4a also has a plurality of cutter bits 4c protruding from the outer shape and the front surface thereof at predetermined intervals.

As shown in FIGS. 2 to 4, a partition wall structure 9 is provided behind the cutter disc 2 and is integrally fixed to the body member 1 b with a chamber 8 interposed therebetween. A horizontal cylindrical body 10, a central wall 10a for closing the front end of the cylindrical body 10, and an opening wall 11 extending radially outward from the peripheral edge of the rear end of the cylindrical body 10 to the trunk member 1b; It is composed of The planetary gear mechanism 7 includes a sun gear 12 and a pair of idle gears 1 meshed with the sun gear 12.
3 and a pair of planetary gears 14 meshed with a pair of idle gears 13, respectively. The sun gear 12 is formed along the outer periphery of the cylindrical body 10, and the planetary gears 14 and the idle gear 13
They are rotatably supported via bearings 15, 15, respectively.

The planetary cutter 5 and the planetary gear 14 are connected to each other by a planetary shaft 16, and the rotational driving force of the planetary gear 14 is transmitted to the planetary cutter 5 via the planetary shaft 16. Rear end 16a of planet shaft 16 and planet gear 1
4 is connected to the planetary shaft 1 by a spline connection.
6 and the planetary cutter 5 are connected via bolts. The planetary shaft 16 and the planetary gear 14 are arranged on the same axis, and the planetary shaft 16 is arranged parallel to the axis of the disk main body 4. The planet housing 1 is connected to the planet shaft 16 via a plurality of bearings 17.
The planet housing 18 is connected to a tip 3 a on the outer peripheral side of the cutter drum 3. The rear end 16a of the planet shaft 16 and the planet gear 14 may be connected via a connection mechanism equivalent to spline connection instead of spline connection.

As shown in FIGS. 4 to 7, the cutter rotation drive mechanism 6 includes a rear end side of the cutter drum 3 and an opening wall 11.
Ring gear 19 having an internal gear 19a provided between
And a plurality of cutter drive motors 20 for rotating the ring gear 19. The ring gear 19 is fixed to the cutter drum 3 and is supported on the opening wall 11 via a swing bearing 19b. Each cutter drive motor 20 is, for example, a hydraulic motor, and a pinion gear 20 a fixed to the motor shaft meshes with the ring gear 19. As the slewing bearing 19b, for example, a tapered roller bearing that can tolerate both a radial load and an axial load is employed. The inner ring of the slewing bearing 19b is formed integrally with the ring gear 19, and the outer ring of the slewing bearing 19b is connected to the opening wall 11 via a bolt.

The ring gear 19 rotates by receiving the rotational driving force of the cutter driving hydraulic motor 20, and the ring gear 19 rotates.
The cutter drum 3 and the disk main body 4 are configured to rotate integrally with the cutter drum 3. Bearings 17 that support each planet shaft 16 include a self-aligning roller bearing 17a as a radial bearing that supports a front end portion of the shaft 16, a thrust self-aligning roller bearing 17b as a thrust bearing,
It comprises a self-aligning roller bearing 17a as a radial bearing for supporting the rear end of the shaft 16, and a spacer 21 is also provided.

The earth load acting on the planetary cutter 5 is mainly an axial load, and is transmitted from the front end 16b of the planetary shaft 16 to the planetary housing 18 via the spacer 21 and the thrust self-aligning roller bearing 17b. Is transmitted from the planetary housing 18 to the slewing bearing 19b via the outer periphery of the cutter drum 3, and is transmitted from the slewing bearing 19b to the opening wall 11, and the earth load is finally transmitted from the opening wall 11 to the shield jack 22. It is configured to be transmitted. The plurality of shield jacks 22 are for generating thrust for excavation, and each shield jack 22 is disposed rearward, and a spreader 22b is provided at the tip of the rod via an eccentric fitting 22a. The shield jacks 22 are connected to each other to generate a digging thrust by applying a reaction force to the segments 34 lining the inner surface of the tunnel.

When the excavation direction of the rectangular tunnel is to be curved, it is necessary to oversize the outer shape of the tunnel. As a result, as shown in FIGS. 4a is provided with a main copy cutter device 50, and each planetary cutter 5 has a first,
Second copy cutter devices 51 and 52 are provided. As shown in FIGS. 8 and 9, the main copy cutter device 50 is provided in one of a pair of cylindrical main cutter spokes 53 provided in the disk main body 4, and mainly includes a cutter unit serving as a main copy cutter. And a main hydraulic cylinder 55 for moving the cutter unit 54 out and back. The cutter portion 54 is provided so as to be able to protrude radially outward from the inside of the main cutter spoke 53, and in particular, four sides of the outer shape of the rectangular cross-section tunnel (that is, the upper, lower, left, and right straight portions of the rectangular cross-section tunnel) are outsided. it can. Further, the cutter portion 54 is connected to a cylinder body 55a of the main hydraulic cylinder 55 via a connecting tool such as a bolt, and is provided so as to be appropriately replaced when worn. The rod portion 55b of the main hydraulic cylinder 55 is connected to an inner diameter wall portion 53a inside the main cutter spoke 53 via a pin 56 so that the cylinder body 55a slides inside the main cutter spoke 53.

Next, a hydraulic system for supplying and discharging hydraulic pressure to and from the main copy cutter device 50 will be described. 12 to 1
As shown in FIG. 4, a swivel joint 24 is provided at the center of the center wall 10a, and a center member 25 extending rearward from the disk main body 4 is provided. The swivel joint 24 and the center member 25 have a plurality of oil passages 26
A grease introduction passage 27 is provided, and one side of a part of the oil passage 26 is guided to the main hydraulic cylinder 55 of the main copy cutter device 50 through the center member 25 and the inside of the disk main body 4. In addition, as described later,
The remaining oil passage 26 is formed by the center member 25 and the planet housing 1.
8 and the planetary copy cutter devices 51 and 52 are guided through the interior of the planetary shaft 16.

As shown in FIG. 15, the main hydraulic cylinder 55 is connected to a hydraulic control circuit 57, and the hydraulic control circuit 57 controls the retracting direction of the cutter unit 54 and the stroke amount, that is, the retracting amount of the cutter unit 54. The exit speed is controlled. The hydraulic control circuit 57 includes a hydraulic supply source (including an oil tank 67, a hydraulic pump 60, a pump drive motor 61, a filter 66, and the like) and oil passages 65a, 65b, 55c, and 55d extending from the hydraulic supply source to the hydraulic cylinder 55.
And an electromagnetic proportional flow control valve 59 interposed in the oil passage 65a.
And the electromagnetic directional control valve 5 interposed in the oil passages 65a and 65b.
8, a flow control valve amplifier 62 for driving the electromagnetic proportional flow control valve 59, and a volume unit including, for example, six volumes (variable resistances) A to F having different resistance values for adjusting the drive signal supplied to the pump 62 63, a control device 64, a rotation detector 64a for detecting a rotation amount of the disk main body 4, and the like. The resistances of the volumes A to F can be adjusted manually, for example, from the outside.

The rotation detector 64a includes a rotary encoder incorporated in one of the cutter drive motors 20 for detecting the rotation amount of the pinion gear 20a, a rotary encoder for detecting the rotation of the rotating member of the swivel joint 24, and the like. The control device 64 has a microcomputer and a control program previously input and stored in the microcomputer. The control device 64 obtains a rotation phase angle from a predetermined origin position of the disk main body 4 based on a detection signal from the rotation detector 64a, and sets a drive signal to be supplied to the amplifier 62 based on the rotation phase angle. Then, a drive signal is supplied to one of the selected volumes A to F. Further, the control device 64 outputs a drive signal for controlling the electromagnetic direction switching valve 58 to the electromagnetic direction switching valve 58 based on the rotation phase angle. At this time, the control device 64
Is a predetermined angle of the cutter section 54, that is, the vertical and horizontal linear positions of the rectangular cross-section tunnel (for example, (1) to
In (9)), different drive signals are output to the electromagnetic directional control valve 58.

Next, the first copy cutter device 51 will be described. As shown in FIGS. 8 and 10, a copy cutter spoke 5 </ b> A is provided in one of the planetary cutters 5 and along the long axis direction of the leaf shape in a front view. The first copy cutter device 51 is provided in the copy cutter spoke 5A, and mainly includes a cutter unit 69 as a copy cutter and a first hydraulic cylinder 70 for moving the cutter unit 69 back and forth. The cutter portion 69 has a leaf-shaped rotation axis center O in a front view.
b along the long radius side in the long axis direction and protrude radially outward from inside the copy cutter spoke 5A, and particularly at the four corners of the rectangular cross section tunnel (that is, four corners of the rectangular cross section tunnel). Corners) can be dug outside.
Further, the cutter section 69 is connected to the cylinder body 70a side of the first hydraulic cylinder 70, and is provided so as to be appropriately replaced when worn. The rod portion 70b of the first hydraulic cylinder 70 is connected to the copy cutter spoke 5A via a connector, and the first hydraulic cylinder 70 slides the cylinder body 70a within the copy cutter spoke 5A.

Next, the second copy cutter device 52 will be described. As shown in FIG. 11, the copy cutter spokes 5B, 5B are positioned inside the other planetary cutter 5 and extend along the major axis of the long axis of the leaf shape in a front view.
Approximately 60 forward and reverse with respect to the center of the planetary cutter 5
Each is provided in the degree direction. The pair of second copy cutter devices 52 are provided in each copy cutter spoke 5B and mainly include a cutter unit 71 as a copy cutter.
And the second hydraulic cylinder 7 for moving the cutter unit 71 back and forth.
2, respectively. Each cutter unit 71
Are approximately 60 degrees in the forward and reverse directions from the approximate center of the leaf shape in a front view, and each copy cutter spoke 5
B and 5B are provided so as to be able to protrude radially outward from the inside, so that the outer shape of the rectangular cross-section tunnel, in particular, the vicinity of four corners (that is, the vicinity of both sides of the four corners of the rectangular cross-section tunnel) can be dug outside. Further, each cutter portion 71 is connected to the cylinder body 72a side of the second hydraulic cylinder 72, and is provided so as to be appropriately replaced when worn. Second hydraulic cylinder 72
The rod part 72b is a copy cutter spoke 5B
And the cylinder body 72a is slid in the copy cutter spoke 5B.

Next, each of the first and second copy cutter devices 5
A hydraulic system for supplying and discharging the hydraulic pressure to 1, 52 will be described. Each of the first and second hydraulic cylinders 70 and 72 in each of the first and second copy cutter devices 51 and 52 includes a solenoid valve (not shown), and this solenoid valve is connected via a connection pipe. It is connected to a hydraulic pump 60. This solenoid valve is connected to each cutter unit 6
It has a function to change the exit direction of 9, 71, each of the first and second
Ports of hydraulic cylinders 70 and 72 (IN side, OUT side)
Side) via the oil passages 26, 26, respectively.
The other side of each of the tubes 6 and 26 is guided through a joint and a connecting pipe (neither is shown).

With respect to the earth removal facility, a screw conveyor 28 is provided rearward from a central wall portion 10a for closing the front end of the cylindrical body 10, and the screw conveyor 28 communicates with the chamber 8 to remove the soil in the chamber 8. -The earth and sand transported to a belt conveyor (not shown) in the field frame 1a and conveyed to the belt conveyor are conveyed to the rear in the tunnel by the belt conveyor or the conveyance cart, and conveyed to the ground.

The erector device 33 for attaching a segment to the inner surface of a tunnel having a rectangular cross section will be described. An annular frame 31 is fixed to the inner peripheral portion of the shield frame 1a, and a guide ring 32 is fixed to the annular frame 31 via a plurality of brackets. The erector frame 35 of the erector device 33 is connected to the guide ring 3 via a plurality of guide rollers.
2, the erector frame 35 has an erector main body 37 attached to the erector frame 35, and a rotator drive unit including a drive motor 36 for driving the erector frame 35 to rotate is also provided.

In the above-mentioned planetary gear mechanism 7, the ratio between the revolution speed and the revolution speed of the planetary cutter 5 is determined by the sun gear 1
2. It can be set arbitrarily by adjusting the gear ratio of the idle gear 13 and the planetary gear 14. In an excavator that excavates a tunnel having a rectangular cross section as in the shield excavator according to the present embodiment, the sun gear 12 and the idle gear 12 are set so that the ratio between the revolution speed and the revolution speed of the planetary cutter 5 is 1: 4. 1
3. The number of teeth of the planet gear 14 is set. Therefore, each of the planetary cutters 5 rotates once when the disk body 4 rotates a quarter turn. The rotation directions of the disk body 4 and the planetary cutter 5 are opposite.

By forming the contour shape of the planetary cutter 5 in a leaf shape as described above in a front view, the corners of the rectangular cross section can be excavated by each of the planetary cutters 5, so that the tunnel having the rectangular cross section can be excavated. Here, the reason why the outline shape of the planetary cutter 5 in a front view is formed in a leaf shape of a tree will be described. As shown in FIG. 16, the rectangular cross-sectional shape of the tunnel is a square h as indicated by a virtual line. In order to excavate this square section tunnel with the shield excavator 1, when the planetary cutter 5 rotates while revolving, it must draw a locus that is always inscribed in the square h. Therefore, when the planetary cutter 5 rotates four times while revolving once,
The locus of the farthest point from the orbital center O of the planetary cutter 5 is
The contour shape of the planetary cutter 5 is determined so as to draw a square h.

Now, assuming that the revolution locus of the rotation center Ob of the planetary cutter 5 is a circle K (shown by a virtual line), a point m1 on the circle K
, M2, ..., the angle of the planetary cutter 5 is θ (θ = 1
5 °) shows the position of the rotation center Ob of the planetary cutter 5 at each angle θ when rotated by 5 °. Point P on square h
, P2,... Are points m1, m2,.
Is a point where a straight line connecting the center of revolution and the center of revolution O intersects the square h.

When the rotation center Ob of the planetary cutter 5 is at the position of the point m1, the radius of the planetary cutter 5 must be equal to the point m1 on the circle K to be inscribed with the square h. It must be a straight line length n1 connecting the point P1 on h. Further, when the planetary cutter 5 moves from the position of the point m1 to the position of the point m2 by revolving at an angle θ, the radius of the planetary cutter 5 is set to It must be a straight line length n2 connecting m2 and the point P2 on the square h.

Similarly, when the planetary cutter 5 moves to the position of the point m3, the radius of the planetary cutter 5 is not the straight line length n3 connecting the point m3 on the circle K and the point P3 on the square h. No. On the other hand, the planetary cutter 5 rotates by an angle of 4θ while revolving by an angle of θ. Therefore, as described above,
By sequentially determining the radius length of the planetary cutter 5, the contour shape of the planetary cutter 5 is determined, and thus the planetary cutter 5 is determined.
Has a leaf shape of a tree.

Next, the operation of the shield machine 1 described above will be described. At the time of normal excavation in which a tunnel having a rectangular cross section is excavated in a straight shape, when the cutter drive motor 20 is driven while generating a thrust for excavation from the plurality of shield jacks 22, the pinion gear 20a
Rotates, the ring gear 19 rotates, and the cutter drum 3
Rotates, and the planet housing 18 and the disk body 4 rotate integrally with the cutter drum 3. The rotation of the disk body 4 causes the main cutter 4 a and a pair of planetary cutters 5 to rotate about the center of the disk body 4. As a result, a tunnel having a circular cross section is excavated by the rotation of the main cutter 4a.

On the other hand, the planetary cutter 5 is
The disk rotates (revolves) around the center of the disk main body 4 due to the rotation of the disk body 4. That is, due to the rotation of the disk body 4, the idle gear 13 meshed with the sun gear 12 rotates while rotating about the center of the disk body 4. The rotation of the idle gear 13 causes the planetary gear 14 to rotate, and the planetary shaft 16 rotates integrally with the planetary gear 14, and the planetary cutter 5 rotates by the rotation of the planetary shaft 16.

Now, the ratio of the revolution speed and the revolution speed of the planetary cutter 5 is set to 1: 4, so that the planetary cutter 5 can rotate the disc main body 4 while the disc body 4 makes one revolution. It rotates four times in the opposite direction. In this way, by rotating the planetary cutter 5 while revolving, the planetary cutter 5 rotates and revolves while always inscribed in a square.
Therefore, the outer periphery of the tunnel having a circular cross section is excavated into a rectangular cross section by the planetary cutter 5 which rotates and revolves, and a tunnel having a rectangular cross section is excavated. In this way, the excavation is stopped every time a predetermined one ring is excavated, and the segment is attached to the latest excavated one ring portion of the inner surface of the tunnel using the erector device 33.
The excavation is resumed by reversing the direction of rotation of.

As shown in FIG. 17, when the tunnel digging direction is curved to the left or right, the first and second copy cutter devices 51 and 52 and the main copy cutter device 50 are left over. The disc body 4 and the planetary cutter 5 are rotated. Then, the upper, lower, left, and right outer lines of the rectangular cross-section tunnel are dug outside. That is, in the first copy cutter device 51 of the one planetary cutter 5, the pump drive motor 61
, The hydraulic pump 60 is operated, and when the solenoid valve receives the extension signal and switches to the extension position, the cylinder body 70a slides. Then, the cutter portion 69 protrudes from the copy cutter spoke 5A (this protruding position is an excavation position). Of course, in this state, the disk body 4 and the planetary cutter 5 are rotating. Accordingly, one corner of the tunnel is dug out by the cutter 69. Hereinafter, the second corner portion, the third corner portion, and the fourth corner portion are sequentially dug. Of course, the depth of the overhang is determined by the cutter portion 69 that can obtain the predetermined overhang depth.
Is selected.

In the second copy cutter device 52 of the other planetary cutter 5, the hydraulic pump 60 is operated by the pump drive motor 61, and when the solenoid valve receives the extension signal and switches to the extension position, each cylinder body 72a Slides. Then, each cutter portion 71 simultaneously projects from the copy cutter spoke 5B (the projecting position is an excavation position). Of course, in this state, the disk body 4 and the planetary cutter 5 are rotating. Accordingly, each of the cutter portions 71 digs the vicinity of both sides of one corner of the tunnel to the outside. Below, the third corner,
Excavation in the vicinity of both sides of the fourth corner is sequentially performed. Of course,
As for the depth of the overhang, the cutter unit 71 is selected so that a predetermined overhang depth can be obtained.

As shown in FIG. 18, in the main copy cutter device 50, when sequentially excavating a predetermined excavation width in a counterclockwise direction, the pump drive motor 61 is driven to operate the hydraulic pump 60. When the main copy cutter device 50 reaches the position (1), the electromagnetic directional control valve 58
Is switched to the extension position in response to the extension signal, the cylinder body 70a slides, and the cutter portion 54 projects from the main cutter spoke 53 by the maximum amount.

When the tip of the cutter unit 54 reaches the position (2), the volume A of the volume unit 63 is selected, and a drive signal is supplied to the electromagnetic proportional flow control valve 59 via the volume A to control the volume. The flow rate in the valve 59 is controlled. In this state, the electromagnetic direction switching valve 58 is controlled to the retreat position to gradually retreat the cutter part 54, and while the cutter disc 2 rotates about 10 degrees, the cutter part 54 It moves almost linearly from (2) to (3).

When the cutter section 54 reaches the position (3),
When the volume B is selected, the flow rate in the control valve 59 is controlled by the drive signal and the volume B in the same manner as described above.
Is gradually retracted, and while the cutter disk 2 rotates about 10 degrees, the cutter section 54 moves almost linearly from (3) to (4). When the cutter unit 54 reaches the position (4), the volume C is selected, the flow rate in the control valve 59 is controlled by the drive signal and the volume C in the same manner as described above, and the electromagnetic directional control valve 58 is controlled to the retreat position. To gradually retract the cutter section 54, and the cutter disc 2
During the rotation by one degree, the cutter unit 54 moves almost linearly from (4) to (5).

When the cutter unit 54 reaches the position (5),
The volume D is selected, the flow rate in the control valve 59 is controlled by the drive signal and the volume D, and the electromagnetic direction switching valve 58 is switched to the extended position to gradually extend the cutter unit 54, and the cutter disk 2 rotates about 10 degrees. In the meantime, the cutter section 54 moves almost linearly from (5) to (6). Similarly, when the cutter unit 54 reaches the position (6), the volume E is selected, the flow rate of the control valve 59 is controlled by the drive signal and the volume E, and the electromagnetic directional control valve 58 is controlled to the extended position. The cutter portion 54 is gradually extended, and the cutter portion 54 moves substantially linearly from (6) to (7) while the cutter disk 2 rotates about 10 degrees.

When the cutter unit 54 reaches the position (7), the volume F is selected, the flow rate of the control valve 59 is controlled by the drive signal and the volume F, and the electromagnetic directional control valve 58 is controlled to the extended position. The cutter portion 54 is gradually extended, and while the cutter disk 2 rotates about 10 degrees, the cutter portion 54 moves almost linearly from (7) to (8). Next, when the cutter unit 54 reaches the position (8), the electromagnetic directional switching valve 58 is held at the retreat position, the cutter unit 54 is driven to retreat, and is kept in the maximum retreat state. Thereafter, when the cutter unit 54 reaches the position corresponding to the above (1) in the straight portion on the left side of the tunnel, the same control as described above is executed, and the remaining portion is dug for the straight portion on the left side of the tunnel.

According to the shield excavator 1, in the main copy cutter device 50 and the first and second copy cutter devices 51 and 52, the rod portion of the hydraulic cylinder is set to the fixed side, and the rod portion of each hydraulic cylinder is connected to the cylinder body side. Although the cutter unit is connected, the cutter unit may be connected to each rod unit side while the cylinder body side is fixed. According to the shield machine 1, the volume 63 is provided so as to apply the six types of signals A to F to the electromagnetic proportional flow control valve 59. However, even if these six types of signals are further increased. Well, in some cases, it can be reduced. Further, instead of the volume 63 and the amplifier 62, a microcomputer may be used to constitute the above-described hydraulic control circuit.

[0051]

According to the first aspect of the present invention, one of the pair of planetary cutters is provided with the first copy cutter device capable of excavating the corner of the rectangular cross-section tunnel outward. Therefore, the four corners of the rectangular cross-section tunnel can be dug outside, and the first copy cutter device is provided on the planetary cutter for excavating the corners of the tunnel and the vicinity thereof. There is no increase in the stroke, no increase in the size of the copy cutter device, and no increase in the size of the cutter disk.

According to the second aspect of the present invention, the other planetary cutter is provided with a pair of second copy cutter devices capable of excavating the vicinity of both sides of the corner of the tunnel having the rectangular cross section outward. The protrusion stroke of the cutter device does not become excessive, and the size of the copy cutter device does not increase. In addition, since the first copy cutter device is provided on one planetary cutter and the pair of second copy cutter devices is provided on the other planetary cutter, the digging load of the pair of planetary cutters can be made as uniform as possible. The other effects are the same as those of the first aspect.

According to the third aspect of the present invention, any one of the main cutter spokes is provided with the main copy cutter device capable of excavating the upper, lower, left and right linear portions of the rectangular cross-section tunnel outward. The protrusion stroke does not become excessive, the size of the main copy cutter device does not increase, the size of the cutter disk does not increase, and the manufacturing cost of the cutter disk does not increase. Other effects are the same as those of the second aspect.

According to the fourth aspect of the present invention, the first copy cutter device has a copy cutter and a first hydraulic cylinder for driving the copy cutter forward and backward, and the second copy cutter device has a copy cutter. Since the first and second hydraulic cylinders are used to switch the first and second copy cutter devices to the remaining positions, the first and second hydraulic cylinders can be used to carry out the extra work. . Other effects are the same as those of the second aspect.

According to the fifth aspect of the present invention, a main copy cutter device has a main copy cutter and a main hydraulic cylinder for driving the main copy cutter forward and backward.
Since the control means for controlling the stroke of the main hydraulic cylinder is provided, it is possible to dig in parallel to the upper, lower, left and right linear portions of the rectangular cross-section tunnel. The other effects are the same as those of the third aspect.

[Brief description of the drawings]

FIG. 1 is a schematic front view of a shield tunnel machine for a rectangular tunnel according to an embodiment of the present invention.

FIG. 2 is a vertical sectional side view of the shield machine.

FIG. 3 is a schematic front view of a planetary gear mechanism of the shield machine.

FIG. 4 is an enlarged view of a main part of FIG. 2;

FIG. 5 is an enlarged view of a main part of FIG. 2;

FIG. 6 is an enlarged view of a main part and a planetary idle gear of FIG. 2;

FIG. 7 is an enlarged view of a main part of FIG. 2;

FIG. 8 is a vertical sectional side view of a cutter disk and a copy cutter device.

FIG. 9 is a schematic front view of a cutter disk.

FIG. 10 is a sectional view of a planetary cutter and its copy cutter device.

FIG. 11 is a sectional view of a planetary cutter and its copy cutter device.

FIG. 12 is a longitudinal sectional side view of an oil passage and the like of the copy cutter device.

FIG. 13 is a schematic front view of a main part of the cutter disk.

FIG. 14 is a sectional view taken along line AA of FIG.

FIG. 15 is a configuration diagram of a hydraulic system of the main copy cutter device.

FIG. 16 is an explanatory diagram of a contour shape of a planetary cutter of a shield machine.

FIG. 17 is an explanatory diagram of an excavation by a shield machine.

FIG. 18 is an explanatory diagram of cutter section position control when the main copy cutter apparatus digs over.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shield excavator 2 Cutter disk 4 Disk main body 5 Planetary cutter 6 Cutter rotation drive means 7 Planetary gear mechanism 50 Main copy cutter device 51 First copy cutter device 53 Main cutter spoke 55 Main hydraulic cylinder 57 Hydraulic control circuit 69 Cutter Part 70 first hydraulic cylinder 71 cutter part 72 second hydraulic cylinder

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Mitsuo Shimizu 1-3-1 Higashikawasakicho, Chuo-ku, Kobe Kawasaki Heavy Industries, Ltd. Kobe Head Office (72) Inventor Tamotsu Munakata 1-1-1, Higashikawasakicho, Chuo-ku, Kobe-shi No. 3 Kawasaki Heavy Industries, Ltd.Kobe Head Office (72) Inventor Masayoshi Ishida 1-7-1 Kyobashi, Chuo-ku, Tokyo Inside Toda Construction Co., Ltd. (72) Inventor Makoto Enkawa 1-chome, Kyobashi, Chuo-ku, Tokyo No. 7-1 Toda Ken Construction Co., Ltd. (72) Inventor Takuya Okuni 1-7-1 Kyobashi, Chuo-ku, Tokyo (72) Inside Toda Construction Co., Ltd. (72) Jun Takahashi 1-7 Kyobashi, Chuo-ku, Tokyo No. 1 Toda Ken Construction Co., Ltd. No. 17 Co., Ltd. Toneuchi Co., Ltd. (72) Inventor Akira Yamada 1-6-17 Meguro, Meguro-ku, Tokyo F-term (Reference) 2D054 AA05 AB05 AC01 AD19 BA07 BA09 BA23 BA25 BB02 CA04 DA02 DA03 DA17 GA25 GA33 GA38 GA49 GA72 GA81

Claims (5)

[Claims] A cutter disk; and a cutter rotation driving means for rotating the cutter disk. The cutter disk is mounted on the disk body and the disk body, and revolves while rotating and rotating in synchronization with the rotation of the disk body.
It has a pair of planetary cutters, and has a planetary gear mechanism that rotates the planetary cutters in conjunction with the rotation of the disk body, and the contour shape of the planetary cutters depends on the ratio of the planetary cutter's rotation speed and revolution speed. A shield excavator capable of excavating a rectangular cross-section tunnel by forming a first copy cutter device on one of the planetary cutters, which is capable of excavating a corner of the rectangular cross-section tunnel outward. Tunnel shield machine. 2. A pair of second planetary cutters capable of excavating outside portions near both sides of corners of a rectangular cross section tunnel to the other planetary cutter.
The shield excavator for a rectangular tunnel according to claim 1, wherein a copy cutter device is provided. 3. A disk drive according to claim 1, wherein a plurality of main cutter spokes are provided on the disk body, and one of the main cutter spokes is provided with a main copy cutter device capable of excavating the upper, lower, left and right straight portions of the tunnel having a rectangular cross section outward. The shield tunneling machine for a rectangular tunnel according to claim 2, wherein: 4. The first copy cutter device has a copy cutter and a first hydraulic cylinder that drives the copy cutter forward and backward, and the second copy cutter device moves the copy cutter and the copy cutter forward and backward. The shield tunnel machine for a rectangular tunnel according to claim 2, further comprising a second hydraulic cylinder to be driven. 5. The main copy cutter device includes a main copy cutter and a main hydraulic cylinder for driving the main copy cutter forward and backward, and further includes control means for controlling a stroke of the main hydraulic cylinder. A shield tunneling machine for a rectangular tunnel according to claim 3.