JP2898968B1 - Shield excavator for free section tunnel - Google Patents

Abstract

An object of the present invention is to provide a shield excavator for a free-section tunnel, in which earth and sand can be efficiently taken into a chamber, and a transmission system for transmitting a driving force to a planetary cutter is simplified and reduced in size. A partition structure (9) is provided behind a cutter disk (2) with a chamber (8) therebetween. A planetary gear mechanism (7) includes a sun gear (12) fixed to the partition structure (9) and an idle gear (13) meshed with the sun gear (12). A planetary gear 16 meshed with the idle gear 13 and a planetary shaft 16 for transmitting the rotational driving force of the planetary gear 14 to the planetary cutter 5, and rotating the rear end of the planetary shaft 16 and the planetary gear 14 with each other. The provision of the spline connection for transmitting the connection enables the excavation of the tunnel with a rectangular cross section, and the planetary gear mechanism 7 is isolated from the chamber 8 near the partition wall structure and is provided in conjunction with the rotation of the disk body 4. The restriction on the sediment inlet adjacent to the front side of the chamber 8 is reduced, the opening ratio can be increased, and the sediment can be efficiently taken into the chamber 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield excavator for a free-section tunnel, and more particularly, to excavating a free-section tunnel by providing a disk body with a planetary cutter that revolves while rotating in synchronization with its rotation. About what you did.

[0002]

2. Description of the Related Art There is a shield excavator as an excavator used when a tunnel such as a subway or a water supply and sewage system is constructed by a shield method. The shield machine is generally capable of excavating a circular tunnel. However, in recent years, a shield machine for a rectangular tunnel capable of excavating a rectangular tunnel (hereinafter, simply referred to as a shield machine) has been developed. For example, a shield machine described in JP-A-10-61382 will be described. As shown in FIGS. 9 and 10, the shield machine has a shield frame 10 having a rectangular cross section.
0 and a body member 110, and a cutter disk 101 is provided at a tip end of the body member 110. The cutter disk 101 has a disk body 102, and excavates by rotating the cutter disk 101.

[0003] A cutter disk 101 includes a center cutter 103 that rotates about a rotation center 102a of a disk body 102, and a rotation center 102 that rotates the disk body 102.
and a pair of planetary cutters 104 that revolve around the planetary shaft 115 while revolving around a. The outline shape of the planetary cutter 104 when viewed from the front is defined by the planetary cutter 104.
The tunnel having a rectangular cross section can be excavated by forming the rotation speed according to the ratio between the rotation speed and the revolution speed and appropriately setting the ratio between the rotation speed and the revolution speed.

The disk body 102 has a rotation center 1
02a is formed to extend rearward from the center housing 105a.
7 and the housing 107 via the bearing 106
It is supported by. A flange-shaped isolation wall 1 extends radially outward from the outer peripheral edge on the rear end side of the housing 107.
08 are formed integrally with the housing 107 and the partition wall 1
08 is formed integrally with the body member 110. The shield frame 100 and the body member 110 are connected to each other via a middle bent portion and a plurality of middle bent jacks, and a plurality of shield jacks 109 for generating thrust for excavation are also provided.

[0005] A central wall 111 is fixed to the separating wall 108, a plurality of cutter driving motors 112 are fixed to the central wall 111, a pinion gear 113 is provided on a motor shaft of the motor 112, and a center frame 105 is provided.
A gear 105a is formed on the outer periphery of the rear end of the
The pinion gear 113 of the motor 112 meshes with 05a. Thus, the center frame 105 is rotationally driven by the driving force of the cutter driving motor 112.

A bearing 1 is provided on the outer peripheral side of the disk body 102.
A planetary shaft 115 rotatably supported via the first and second shafts 14 and 114 is positioned 180 degrees parallel to the center frame 105 with respect to the axial center 102a of the bit body 102 in a front view.
A pair of planetary cutters 104, each disposed at a degree symmetrical position.
Are fixed to the tip of each planetary shaft 115.
A planetary gear 116 is fitted around the center of each planetary shaft 115 in the longitudinal direction. ing. Each planet idle gear 117 has a bearing 1
18. A sun gear 120 is formed around the idle shaft 119 rotatably supported via 118, and a sun gear 120 is formed on the outer peripheral portion of the distal end of the housing 107. Each planetary idle gear 117 meshes with the sun gear 120, respectively. ing.

According to this shield excavator, the drive motor 112 is driven to drive the center frame 105.
Then, the disk body 102 rotates. Disk body 102
Rotates, the center cutter 103 rotates, and the planetary idle gear 117 revolves around the sun gear 120 (self-revolution). When the planetary gear 116 rotates with the rotation and rotation of the planetary idle gear 117, each planetary cutter 104 rotates (rotates and rotates) while revolving around the sun gear 120. The contour shape of the planetary cutter 104 when viewed from the front is formed according to the ratio between the rotation speed of the planetary cutter 104 and the revolution speed, and the ratio of the rotation speed and the revolution speed of the planetary cutter 104 is appropriately set. The tunnel can be excavated with a rectangular cross section.

[0008]

However, according to the shield machine described above, the disk body 102 and the partition wall 10
Since the planetary idle gear 117 and the planetary gear 116 are incorporated on the front side in the chamber, which is an annular space formed between the planetary gear 8 and the planetary gear 8, it is difficult to enlarge the chamber.
The intake of earth and sand into the chamber is restricted, and the aperture ratio in the cutter disk 101 is reduced. Therefore, the excavated earth and sand cannot be efficiently taken into the chamber, and it is difficult to enhance the excavation performance. Also, the sun gear 120 is
Since it is arranged near the center of the axis of the center frame 105 and is arranged on the front side in the chamber, the area of the opening of the earth and sand at the center of the cutter disc 101 cannot be made large, and therefore the center of the cutter disc 101 Cannot be taken into the chamber efficiently.

As described above, since the earth and sand cannot be efficiently taken into the chamber, the earth and sand cannot be smoothly introduced from the chamber into the screw conveyor. Therefore, this shield machine has a limited flowability. There is a problem that it can be applied only to excavation of the soil ground.

Therefore, in order to increase the aperture ratio of the cutter disk, a planetary gear mechanism for rotating the planetary cutter is arranged on the rear side of the chamber, and the planetary gear and the planetary shaft are pin-joined with a universal joint, It has also been considered to connect the planetary shaft and the planetary cutter with a universal joint pin. However, in this structure, the transmission system for transmitting the rotational driving force for rotation to the planetary cutter has a complicated structure, and the durability is poor. An object of the present invention is to provide a shield tunneling machine for a free-section tunnel, in which earth and sand can be efficiently taken into a chamber.
And simplification of the driving force transmission system for rotating the planetary cutter so that the durability is excellent.

[0011]

According to a first aspect of the present invention, there is provided a shield tunneling machine for a tunnel having a free cross section, comprising: a cutter disk; and a cutter rotation driving means for driving the cutter disk to rotate. Equipped with a planetary cutter that revolves while rotating in synchronization with the rotation of the disk body, and a planetary gear mechanism that rotates the planetary cutter in conjunction with the rotation of the disk 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 a cutter, a partition structure is provided behind a cutter disk with a chamber therebetween, and the planetary gear mechanism is provided. Has a sun gear fixed to the partition wall structure, an idle gear meshed with the sun gear,
A planetary shaft having a planetary gear meshed with the idle gear; transmitting a rotational driving force of the planetary gear to a planetary cutter; and connecting a rear end of the planetary shaft and the planetary gear so that the rotational driving force can be transmitted. A spline connection or a connection mechanism equivalent thereto is provided.

By excavating a circular cross section by the disk body of the cutter disk and excavating a plurality of corners of the free cross section via the planetary cutter, a tunnel having a free cross section can be excavated. A sun gear of a planetary gear mechanism for rotating the planetary cutter is provided in a partition structure separating the chamber, and a planetary gear mechanism including a sun gear, an idle gear, and a planetary gear is disposed near the partition structure, and the chamber The restriction on the sediment intake on the front side of the lands is reduced, and the aperture ratio can be increased. Thereby, earth and sand can be efficiently taken into the chamber. Furthermore, since the rear end of the planetary shaft and the planetary gear are connected by a spline connection or a connection mechanism equivalent thereto, the rotational driving force of the planetary gear can be reliably transmitted to the planetary shaft. The planetary gear and the planetary gear can be arranged substantially on the same axis.

According to a second aspect of the present invention, there is provided a shield excavator for a free section tunnel according to the first aspect of the present invention, wherein the cutter rotation driving means includes a ring gear fixedly mounted on a disk body and a plurality of ring gears for rotating the ring gear. And a cutter drive motor. The ring gear rotates by receiving the driving force of the cutter driving motor, and can rotate the disk body.

According to a third aspect of the present invention, there is provided a shield excavator for a free section tunnel, wherein the ring gear comprises:
The present invention is characterized in that the bearing is supported via a roller bearing capable of allowing a radial load and an axial load. The ring gear rotates by receiving the driving force of the cutter driving motor,
Rotate the cutter disc. The ring gear is capable of transmitting an axial load such as an earth load or a thrust for excavation acting on the ring gear from the cutter disk and transmitting the load to the partition wall structure.

According to a fourth aspect of the present invention, there is provided a shield excavator for a free-section tunnel according to the third aspect of the present invention, further comprising a planet housing provided on the planet shaft, and transmitting a soil load acting on the planet cutter from the planet shaft to the planet housing. A bearing that transmits the earth load from the planetary housing to the partition structure. The earth load acting on the planetary cutter can be transmitted from the planetary shaft to the planetary housing via the bearing, transmitted from the planetary housing to the ring gear, and transmitted to the partition structure.

According to a fifth aspect of the present invention, there is provided a shield excavator for a free section tunnel according to the fourth aspect, wherein the bearing is a thrust self-aligning roller bearing or a roller bearing capable of at least allowing an axial load. Things. An axial load can be transmitted from the inner ring of the bearing to the outer ring.

In a sixth aspect of the present invention, the planetary shaft is disposed in parallel with the axis of the disk body, and the front end of the planetary shaft is fixed to the planetary cutter. It is characterized by the fact that it is connected together. The transmission system for transmitting the rotational driving force in the order of the planetary gear, the planetary shaft, and the planetary cutter is simplified.

According to a seventh aspect of the present invention, there is provided a shield excavator for a free section tunnel according to any one of the first to sixth aspects, wherein an aperture ratio of the cutter disk is arbitrarily set. is there. Since the aperture ratio can be set arbitrarily, the aperture ratio can be set large, the excavation efficiency can be increased, and shield excavation can be performed even for various types of soil.

[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, a shield machine 1 according to this embodiment excavates a square-section tunnel (sometimes referred to as a rectangular-section tunnel) as an example of a free-section tunnel. The shield machine 1 includes a shield frame 1a as a trunk member and a trunk member 1b in front of the shield frame 1a.
a and the body member 1b are connected to each other via a middle bent portion and a plurality of middle bent jacks 30. The cutter disk 2 is
It is arranged on the front end 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. I have.

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.

As shown in FIGS. 3 and 4, on the rear side of the cutter disk 2, there is provided a partition structure 9 integrally fixed to the body member 1b with a chamber 8 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 slewing bearing 19 has a function of rotating the inner ring 19b by receiving the rotational driving force of the cutter driving hydraulic motor 20, and is configured so that the cutter drum 3 and the disk main body 4 rotate integrally with the inner ring 19b. ing. Bearings 17 supporting each planet shaft 16 include a self-aligning roller bearing 17a as a radial bearing for supporting a front end portion of the shaft 16, a thrust self-aligning roller bearing 17b as a thrust bearing, and a rear end of the shaft 16. A self-aligning roller bearing 17a as a radial bearing for supporting the portion is provided, 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. Each shield jack 22 is disposed rearward, and a spreader 22b is connected to a tip of the rod via an eccentric fitting 22a. Then, the shield jacks 22 generate a digging thrust by applying a reaction force to the segments 34 lining the inner surface of the tunnel.

By the way, when the excavation direction of the rectangular tunnel is curved, it is necessary to oversize the outer shape of the tunnel. As shown in FIGS. 1, 2 and 5, And a copy cutter 23A in the main cutter 4a.
The one planetary cutter 5 is provided with a pair of copy cutters 23B, and the other planetary cutter 5 is provided with a copy cutter 23C. The copy cutter device 23A includes a cutter unit 2 that can protrude radially outward.
3a and a hydraulic cylinder 2 for moving the cutter unit 23a back and forth
3b. The copy cutter 23
B and 23C have the same structure.

The copy cutters 23A, 23B, 23
A hydraulic system for supplying and discharging hydraulic pressure to C will be described. A swivel joint 24 is provided at the center of the center wall 10a, and a center member 2 extending rearward from the disc body 4 is provided.
The swivel joint 24 and the center member 25 are provided with a plurality of oil passages 26 and a grease introduction passage 27. Some oil passages 26 are guided to the copy cutter 23A through the center member 25 and the inside of the disk main body 4, and the remaining oil passages 26 are copied through the center member 25, the planet housing 18 and the inside of the planet shaft 16. The cutters 23B and 23C are guided.

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 soil and 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 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-described 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 front view in the shape of a tree leaf as described above, a corner having a rectangular cross section can be excavated by each planetary cutter 5, so that a tunnel having a 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. 8, the rectangular cross-sectional shape of the tunnel is a square h as indicated by a virtual line. In order to excavate this square cross section tunnel with the shield machine 1, when the planetary cutter 5 rotates while revolving around, this square h is always used.
You must draw a trajectory that inscribes the. 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 (indicated 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.

Here, 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 and the square to make the planetary cutter 5 inscribe 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 the angle θ, the radius of the planetary cutter 5 must be set at the point on the circle K in order for the planetary cutter 5 to be inscribed in the square h. 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. The excavation is stopped every time a predetermined one ring is excavated, and a segment is attached to the latest excavated one ring portion of the inner surface of the tunnel using the erector device 33. Thereafter, the rotation direction of the cutter disk 2 is changed. The excavation is restarted by reversing.

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 between 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 body 4 in one rotation while the disc body 4 makes one rotation. 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.

When bending the tunnel excavation direction,
The excavation with the copy cutters 23A and 23B protruding is performed, and at the same time, the body member 1b is excavated while being directed in the excavation direction with respect to the shield frame 1a via the center bending jacks 30 on both right and left sides. And dig into the shape.

According to the shield machine 1 described above,
Since the disk body 4 is equipped with the pair of planetary cutters 5, a tunnel having a rectangular cross section can be excavated by the main cutter 4a and the planetary cutters 5. The sun gear 12 of the planetary gear mechanism 7 is provided on the cylindrical body 10 of the partition wall structure 9 separating the chamber 8, and the planetary gear mechanism 7 is disposed near the partition wall structure 9. The restriction on the intake of the cutter disk is reduced, and the cutter disk 2
Can be increased, and the aperture ratio is set to 60% or more. Then, the shape of the main cutter 4 a in the cutter disk 2 when viewed from the front can be made a slim structure with a high degree of freedom, and the earth and sand can be efficiently taken into the chamber 8.

The planetary shaft 16 is arranged in parallel with the axis of the cutter disc 2, and the rear end 16a of the planetary shaft 16 and the planetary gear 14 are connected by a spline connection or a connection mechanism equivalent thereto. Therefore, the planetary shaft 16 and the planetary gear 14 can be arranged on the same axis, and the rotational driving force of the planetary gear 14 can be reliably and efficiently transmitted to the planetary shaft 16, and the driving system that transmits the rotation driving force to the planetary cutter 5. Can have a simple structure and excellent durability.

Further, as the bearing for supporting the ring gear 19, a tapered roller bearing capable of permitting both a radial load and an axial load is employed, so that the open disk 11 receives the earth load (load in the axial direction) from the cutter drum 3 and receives the load.
Can be transmitted to Since the planetary housing 18 and the thrust self-aligning roller bearing 17b are provided, the earth load acting on the planetary cutter 5 can be removed from the planetary shaft 16 via the thrust self-aligning roller bearing 17b.
And transmitted from the planetary housing 18 to the ring gear 19 via the cutter drum 3 and transmitted to the opening wall 11 as described above. Of course, the excavating thrust by the plurality of shield jacks 22 can also be transmitted to the cutter disk 2 through a path reverse to the above-described path for transmitting the earth load.

According to the shield machine 1, the rear end portion 16 a of the planetary shaft 16 and the planetary gear 14 are connected by a spline connection, but a connection mechanism equivalent to the spline connection may be adopted. . According to the shield machine 1, tapered roller bearings are used as the slewing bearings 19, but self-aligning roller bearings may be used depending on the maximum axial load. Further, in the shield machine 1, the thrust self-aligning roller bearing 17b is employed, but a tapered roller bearing may be employed instead of the thrust self-aligning roller bearing.

As a mechanism for connecting the rear end of the planetary shaft 16 to the planetary gear 14, in addition to the spline connection, a connection equivalent to a spline connection such as inserting a rectangular section shaft into a rectangular section hole of the planetary gear. A mechanism can also be employed. The shield machine 1 includes a pair of planetary cutters 5.
Although the case where it equips with was explained as an example, one planetary cutter 5 may be provided in the shield machine. Further, in the shield machine, an earth pressure type shield is provided as an example of an earth discharging facility. However, the shield machine can be applied to a muddy water shield, in which case, instead of the earth discharging facility, a mud discharging machine is used. Equipment is applied. In addition, it is needless to say that the present invention can be embodied in a form in which various parts are added to each part of the shield machine without departing from the spirit of the present invention.

When the ratio between the rotation speed and the revolution speed of the planetary cutter is set to 4: 1, a square section is set, when set to 3: 1, a triangular section is set, and when set to 2: 1, a rectangular section is set. When the ratio is set to 5: 1, a regular pentagonal tunnel can be excavated. However, it is assumed that the contour shape of the planetary cutter is appropriately set according to the cross-sectional shape of the tunnel to be excavated, that is, the ratio between the rotation speed and the revolution speed of the planetary cutter.

[0045]

According to the first aspect of the present invention, a tunnel having a rectangular cross section can be excavated by the disk body of the cutter disk and the planetary cutter, and the planetary gear mechanism for rotating the planetary cutter in synchronization with the rotation of the disk body. The sun gear is arranged on the partition structure located behind the cutter disk with the chamber separated, and the planetary gear mechanism is arranged near the partition structure, so that the chamber can be formed large and the soil on the front side of the chamber can be formed. The restriction on the intake is reduced, the opening ratio of the cutter disk is increased, and the excavated earth and sand can be efficiently taken into the chamber. Therefore,
It can also be used for excavation of soil made of soil with poor fluidity.

Since the rear end of the planetary shaft and the planetary gear are connected by a spline connection or a connection mechanism equivalent thereto, the planetary shaft and the planetary gear can be arranged on the same axis, and the rotational driving force of the planetary gear can be set. Can be reliably and efficiently transmitted to the planetary shaft, and the structure of the drive system for transmitting the rotation driving force to the planetary cutter can be simplified and the durability can be improved.

According to the second aspect of the present invention, the cutter disk can be rotated by the cutter rotation driving means having the ring gear fixedly mounted on the disk main body and the plurality of cutter driving motors. The other effects are the same as those of the first aspect.

According to the third aspect of the present invention, the ring gear
Since the bearing is supported via a roller bearing capable of allowing a radial load and an axial load, the axial load acting on the ring gear from the cutter disk can be supported via the roller bearing. Other effects are the same as those of the second aspect.

According to the fourth aspect of the present invention, the planetary housing is provided, and the earth load acting on the planetary cutter is transmitted from the planetary shaft to the planetary housing via the bearing, and transmitted from the planetary housing to the partition structure via the ring gear. be able to. The other effects are the same as those of the third aspect.

According to the fifth aspect of the present invention, since the bearing of the fourth aspect is a thrust self-aligning roller bearing or a roller bearing capable of at least allowing an axial load, the same effect as that of the fourth aspect is ensured. . The other effects are the same as those of the fourth aspect.

According to the sixth aspect of the present invention, the planetary shaft is disposed parallel to the axis of the disk body, and the front end of the planetary shaft is fixedly connected to the planetary cutter. The structure of the drive system for transmitting the rotation driving force can be simplified and the durability can be improved.
The other effects are the same as those of the fourth aspect.

According to the invention of claim 7, since the aperture ratio of the cutter disk is arbitrarily set, the aperture ratio can be increased and excavated earth and sand can be efficiently taken into the chamber. Therefore, it is possible to cope with the excavation of the ground made of the soil having poor fluidity. In addition, the same effect as any one of the first to sixth aspects is obtained.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view of a shield tunnel machine for a rectangular tunnel according to an embodiment of the present invention.

FIG. 2 is a schematic front 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 sectional view of a main part of FIG.

FIG. 5 is an enlarged view of a main part of FIG. 1;

FIG. 6 is an enlarged view of a main part and a planetary idle gear of FIG. 1;

FIG. 7 is an enlarged view of a main part of FIG. 1;

FIG. 8 is an explanatory diagram of a contour shape of a planetary cutter of the shield machine.

FIG. 9 is a longitudinal sectional side view of a main portion of a conventional rectangular tunnel shield machine.

FIG. 10 is a front view of the shield machine shown in FIG. 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shield excavator 2 Cutter disk 4 Disk main body 5 Planetary cutter 6 Cutter rotation drive mechanism 7 Planetary gear mechanism 9 Partition structure 12 Sun gear 13 Idle gear 14 Planetary gear 16 Planetary shaft 17b Thrust self-aligning roller bearing 18 Planetary housing 19 Ring gear 20 Cutter drive hydraulic motor

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tamotsu Munakata 1-3-1 Higashikawasaki-cho, Chuo-ku, Kobe Kawasaki Heavy Industries, Ltd. Kobe Head Office (72) Inventor Akio Shiseki 1-7-7 Kyobashi, Chuo-ku, Tokyo No. 1 Toda Construction Co., Ltd. (72) Inventor Seiichi Matsushita 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (72) Jun Takahashi 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (72) Inventor Takuya Okuni 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (72) Inventor Akira Nishimura 1-6-1-17 Meguro, Meguro-ku, Tokyo Toneuchi Co., Ltd. (72) Inventor Taro Watanabe 1-6-17 Meguro, Meguro-ku, Tokyo, Japan Toneuchi Co., Ltd. (72) Inventor Akira Yamada 1-6-17 Meguro, Meguro-ku, Tokyo Tone, Ltd. (56) Reference Patent flat 10-61382 (JP, A) (58 ) investigated the field (Int.Cl. ^6, DB name) E21D 9/08

Claims (7)

(57) [Claims] 1. A planetary machine comprising a cutter disk and cutter rotation driving means for driving the cutter disk to rotate, wherein 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. A cutter and a planetary gear mechanism that rotates the planetary cutter in conjunction with the rotation of the disk body,
In a shield machine capable of forming a contour shape of a planetary cutter in accordance with a ratio between the rotation speed and the revolution speed of the planetary cutter to excavate a free-section tunnel, a partition wall is provided with a chamber behind a cutter disk. A planetary gear mechanism having a sun gear fixed to the partition wall structure, an idle gear meshed with the sun gear, and a planetary gear meshed with the idle gear. A planetary shaft for transmitting to a planetary cutter, and a spline coupling or a coupling mechanism equivalent thereto for coupling the rear end of the planetary shaft and the planetary gear so as to be able to transmit a rotational driving force. Shield machine. 2. The freedom according to claim 1, wherein the cutter rotation driving means includes a ring gear fixedly mounted on the disk body and a plurality of cutter driving motors for rotating the ring gear. Shield tunneling machine for sectional tunnels. 3. The shield machine according to claim 2, wherein the ring gear is supported via a roller bearing capable of allowing a radial load and an axial load. 4. A planetary housing provided on the planetary shaft, a bearing for transmitting a soil load acting on a planetary cutter from the planetary shaft to the planetary housing is provided, and the soil load is transmitted from the planetary housing to the partition structure. The shield machine for a free-section tunnel according to claim 3, wherein the shield machine is configured as described above. 5. The shield machine according to claim 4, wherein the bearing is a thrust self-aligning roller bearing or a roller bearing capable of tolerating at least an axial load. 6. The free cross-section according to claim 4, wherein the planetary shaft is disposed parallel to an axis of a disk body, and a front end of the planetary shaft is fixedly connected to a planetary cutter. Tunnel shield machine. 7. The tunnel machine according to claim 1, wherein an aperture ratio of the cutter disk is arbitrarily set.