JP2592421Y2 - Deformed shield excavator - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention uses a cutter head corresponding to a deformed cross section when excavating a tunnel, and allows a tunnel having a cross section corresponding to the deformed cutter head to be directly excavated. About the machine.

[0002]

2. Description of the Related Art A conventional general shield excavator has a cylindrical shield body. A cutter head is attached to a front end face of the excavator, and the cutter bit is provided on the surface of the cutter head by rotating the cutter head. It is designed to excavate mountains. Then, the excavated earth and sand is taken into the shield chamber and carried out by a screw conveyor. In such a shield excavator, the excavation cross section has to be a circular cross section determined by the rotation of the cutter head, and any cross section cannot be excavated.

[0003] In view of the above, in the case of excavation of a cocoon-shaped tunnel such as a double-lane tunnel or a double-track tunnel, a circular shield digging of a large section including the cocoon-shaped section is performed, or a shield excavator is used. Is proposed in which a cocoon-shaped tunnel section is excavated by using a multi-layer type. For example, in a method called the DOT shield method, a plurality of spoke type cutter heads are provided, adjacent cutter heads are engaged with each other like gears, synchronously controlled, and the face is excavated on the same plane as in the conventional circular cross section. The mud pressure type modified section shield excavator is used. In addition, there is a construction method known as an MF (multi-face) shield construction method. Using a muddy-type irregular-section shield excavator in which cutter heads are superimposed with a phase difference in front and rear, the rotation direction of each cutter head can be freely set. By controlling the attitude of the shield excavator by changing to, the eyebrows section is excavated at once.

[0004]

However, in the above-mentioned conventional method of excavating a special section, a circular excavation section is basically connected, and a shield excavation is actually performed directly in an arbitrary cross section. There was a problem that it was not possible.

[0005] In particular, since the excavated cross section is of a cocoon shape in which a circular cross section is overlapped, a recess that cannot be excavated is formed in the lap portion, so that the propulsion direction is restricted, and the propulsion direction is limited. There was a problem that was difficult to move. For curve excavation, this type of excavator is provided with a copy cutter as an overhanging device on the outer periphery of the cutter head, which is actually a short stroke, and is a shield excavator for ordinary single circular section excavation. However, since the cutter cannot reach the outer edge of the recess, a practical effect cannot be expected in the above-mentioned shield excavator having the irregular cross section.

In the case of digging an elliptical shape, a horseshoe shape, an arched shape, an oval shape, a rectangular shape, or a square shape, the tunnel section should be excavated in a large section including these sections. At present it is inevitable.

SUMMARY OF THE INVENTION The present invention focuses on the above-mentioned conventional problems, and provides a deformed section shield excavator in which a deformed section other than a circle can be directly shielded by a cutter head corresponding to the section shape. With the goal.

[0008]

To achieve the above object, according to the solution to ## modified cross-section shield excavating machine according to the present invention has a profile cutter head corresponding to the irregular cross section to be excavated,
A pair of rotary driving devices are provided at target positions from the center of the deformed cutter head, and each rotary driving device is fixed to the shield main body side and includes a drum support unit having a rotary driving unit,
A first eccentric drive drum which is eccentrically arranged with respect to the center of rotation of the drum support and is driven to rotate; A second eccentric drum for adjusting the amount of eccentric rotation about the driven shield side is mounted, and the deformed cutter head is mounted on the front surface of the second eccentric drum.

[0009]

According to the above construction, the first eccentric drive drum is driven to rotate around the center of the drum support. However, since the first eccentric drive drum is eccentric from the center of the drum support (eccentric amount e ₁ ), it is eccentrically rotated. Further, the second eccentric drum attached to the first eccentric driving drum is further eccentric from the rotation center of the first eccentric driving drum (eccentric amount e ₂ ). Therefore, the first eccentric drive drum is rotated eccentrically by rotating the first eccentric drive drum on the drum support portion side, and the shield side is rotated by rotating the second eccentric drum by a predetermined angle by the drive means of the first eccentric drive drum. The amount of eccentric rotation about the center can be adjusted. By providing a pair of these rotary driving devices and rotating them synchronously, the supported cutter head rotates eccentrically in accordance with the amount of eccentricity of the first eccentric driving drum, and the eccentricity rotates by rotating the second eccentric drum by a predetermined angle. The amount can be adjusted. That is, the cutter head is eccentric in the radial direction with respect to the center of the shield.
The plane can be moved within the range of (e ₁ + e ₂ ). As a result, the cutter head rotates eccentrically with respect to the shield center in the same state as supported by the parallel link mechanism,
The excavation is to be performed on the ground in a plane vibration state. Therefore, it is possible to excavate a cross section of an irregular shape according to the outer shape of the cutter head. In addition, since the amount of eccentricity is variable, the excavation range of the irregular cross section can be changed.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a shielded excavator according to the present invention.

FIGS. 1 and 2 show the overall construction of a shielded excavator having a modified cross section according to an embodiment. FIG.
FIG. 2 is a partial sectional front view in which a half of the cutter head is cut away and a sectional view in which the cutter head is removed. This example is for directly excavating an arched tunnel. This shield excavator includes a shield machine main body 12 having a cutter head 10 at a front end. The cutter head 10 has a shape similar to the cross section of the tunnel to be excavated, and the shield machine main body 12 has an arched cross section corresponding to the cross section of the tunnel to be excavated. A bulkhead 14 is formed on the front body side of the shield machine main body 12 so as to partition the inside of the main body 12 back and forth. The bulkhead 14 has a pair of circular through holes in the horizontal direction with the shield center _CS as a center. Are formed at target positions, and these are used as bearing portions to form a pair of rotary drive devices 16 (16R, 16L).
Is attached.

The structure of each rotary drive 16 will be described mainly with reference to FIG. The rotation drive device 16 includes a drum support 18 fixedly attached to the through hole. The drum supporting portion 18 is configured as a ring-shaped bearing member having a bearing groove 20 formed in a substantially U-shaped cross section. A ring gear of a first eccentric drive drum described later is fitted into the bearing groove 20 and rotated. It will support as much as possible. A main drive motor 22 is attached to the back side of the drum support 18 to provide rotational drive, and the gear 24 rotated by the main drive motor 22 faces the bearing groove 20.
It is designed to mesh with the ring gear inserted.

A first eccentric drive drum 26 having a circular plate shape is rotatably mounted on the front portion of the drum support portion 18. The first eccentric drive drum 26 has a ring gear 28 protruding from the back side thereof, and the ring gear 28 is fitted into the bearing groove 20 of the drum support 18. At this time, the rotation center of the ring gear 28 coincides with the center of the first eccentric drive drum 26, but the first eccentric drive drum 26
An eccentric bearing portion 30 that is eccentric by _one and rotatably supports a second eccentric drum described later is attached. The eccentric bearing portion 30 is formed in a ring shape having a U-shaped cross section with an open front end face, and eccentrically rotates the second eccentric drum. Thus, the center of rotation C _D1 of the drum support 18 and the center C _E1 of the eccentric bearing 30 of the first eccentric drive drum 26 are configured to be eccentric by e ₁ . A drive motor 32 is attached to the inner peripheral surface of the eccentric bearing 30, and the eccentric bearing 30
The ring gear of the second eccentric drum mounted on the rotator is driven to rotate.

As described above, the second eccentric drum 34 for supporting the cutter head 10 is mounted on the front surface of the first eccentric drive drum 16 which is eccentrically mounted on the bulk head 14 of the shield machine main body 12. I have. A ring gear 36 mounted on an eccentric bearing 30 eccentrically mounted on the first eccentric drive drum 26 is mounted on the back surface of the second eccentric drum 34, and the ring gear 36 is rotated by the drive motor 32. I have to. At this time, the center of rotation of the ring gear 36 coincides with the center of the second eccentric drum 34, but the second eccentric drum 34 has an eccentric circumferential groove eccentric from the center of the ring gear 36 by e ₂ to support the cutter head 10. 38 are formed. The eccentric circumferential groove 38 is formed in a ring shape having a U-shaped cross section with an open front end surface (the center C _E2 of the circumferential groove 38), and rotates the cutter head 10 around the center C _E1 around the second eccentric drum 34. It is adapted to be eccentrically rotated radius e _2.

A pair of ring sleeves 40 are provided on the back surface of the cutter head 10 and are mounted in eccentric circumferential grooves 38 of the second eccentric drum 34 in each rotary drive.

Because of this, the cutter head 10
Is driven by the main drive motor 22 on the drum support portion 18 side, according to the amount of eccentricity e ₁ of the eccentric bearing portion 30 in the first eccentric drive drum 26 from the rotation center CD ₁ of the drum support portion 18. It is eccentrically rotated. The amount of rotation eccentricity can be changed by adjusting the amount of eccentricity e ₂ of the second eccentric drum 34 with respect to the first eccentric drive drum 26 by rotating the motor 32. That is, with respect to the center of the shield (substantially the center C _D1 of the drum support 18),
The rotational eccentricity of the cutter head 10 can be set in the range of (e ₁ ± e ₂ ), and if the eccentric amounts e ₁ and e ₂ are set to be equal, it can be adjusted in the range of 0 to 2e ₁ .

The cutter head 10 is provided with a cutter bit on its front surface, and the cutter head 10 is eccentrically rotated to excavate the front face. Further, the inside of the shield machine main body 12 between the bulkhead 14 and the cutter head 10 is a shield chamber 42 serving as a space for taking in excavated earth and sand. The screw conveyor 44 is exposed to this to discharge excavated earth and sand.
A shield jack 46 is provided on the back surface of the bulkhead 14 in the shield machine main body 12, and the shield jack 46 is extended while supporting a segment 48 formed on the rear side as a reactive force, thereby propelling the shield excavator. ing.

The excavating operation of the shield excavator thus configured is as follows. That is, when excavating an arch-shaped tunnel, a structure is adopted in which the cutter head 10 is attached to the shield body 12 corresponding to this shape. A pair of driving devices 16 for rotatingly driving the cutter head 10 are connected to the back of the cutter head 10 from a center to a target position. In such a state, the rotary drive 16
Drive. Now the center C _D1 of the drum supporting device 18 second
When the main motor 22 of the drum supporting device 18 is driven while the center C _E2 of the eccentric drum 34 is matched, the first eccentric driving drum 26 rotates and the eccentric bearing 30 rotates eccentrically, but the second eccentric drum 34 does not rotate. From this state, the drive motor 32 of the first eccentric drive drum 26
To drive the first eccentric drum 34 to be eccentric with respect to the first eccentric driving drum 26, the second eccentric drum 34 generates an eccentric amount with respect to the drum supporting portion 18 according to the rotation angle thereof,
It is eccentrically rotated. By synchronously rotating the rotation driving devices 16R and 16L attached to the cutter head 10, the cutter head 10 rotates eccentrically. Therefore, as shown in the right half of FIG. 2A, the bit provided on the surface of the cutter head 10 makes a circular motion according to the amount of eccentricity, and as a result, it is possible to excavate the ground. And
When the amount of eccentricity is maximized (e ₁ + e ₂ ), the cutter head 10
Of the shield body 12 is rotated while protruding from the outer edge of the shield main body 12 by a predetermined amount, and this range can be enlarged and excavated. This also enables curved excavation.

The amount of eccentric rotation of the cutter head 10 can be arbitrarily set by driving the drive motor 32 of the first eccentric drive drum 26 and adjusting the rotation angle of the second eccentric drum 34, as shown in FIGS. This is also possible by the method shown in FIG.

FIG. 4 shows the first eccentric drive drum 2
6 and the second eccentric drum 34 are connected to each other by a connecting pin 50 provided at an eccentric position,
The drive cylinder 52 is attached to this and the point target position. The cylinder 52 is disposed along the surface of the drums 26 and 34 along the surface thereof.
6, 34 are rotated around the connecting pin 50. The amount of eccentricity can be adjusted by the amount of rotation about the connecting pin 50 as in the above embodiment.

FIG. 5 shows a slide type configuration in which a long groove 54 is formed on one of the first eccentric drive drum 26 and the second eccentric drum 34, and a slider 56 adapted to the long groove 54 is mounted on the other. Both are slidable along the joint surface. Driving may be performed by a cylinder 58 attached to one of the drums. In this case as well, the relative movement of the second eccentric drum 34 is possible, and the eccentric amount can be adjusted to an arbitrary amount.

[0022]

As described above, according to the deformed section shield excavator according to the present invention, a deformed cutter head corresponding to the deformed section to be excavated is provided, and a target position from the center of the deformed cutter head is provided. Are provided with a pair of rotary drive units, each rotary drive unit is fixed to the shield body side and provided with a drum support unit and a rotary drive unit, and is eccentrically arranged with respect to the rotation center of the drum support unit and is driven to rotate. A first eccentric drive drum and a shield side mounted on and driven to be eccentrically rotatable with respect to the center of rotation of the first eccentric drive drum.
A second eccentric drum that adjusts the amount of eccentric rotation about the center is mounted, and the modified cutter head is mounted on the front surface of the second eccentric drum. It is possible to excavate a deformed section directly by using the, without using multiple cutter heads, using a complicated rotary drive mechanism, and because there is no unexcavated part that hinders excavation,
The effect that it is possible to excavate a tunnel with a deformed section very efficiently is obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view of a shield excavator according to an embodiment.

FIG. 2 is a front view of the shield excavator in which a cutter head half is omitted, and a front view in which a cutter head front is omitted.

FIG. 3 is an exploded perspective view of a portion of a rotary drive device by the same device.

FIG. 4 is an exploded perspective view of another modification of the rotary drive unit.

FIG. 5 is an exploded perspective view of still another modification of the rotary drive unit.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Cutter head 12 Shield machine main body 14 Bulk head 16 (16R, 16L) Rotation drive device 18 Drum support part 20 Bearing groove 22 Main drive motor 24 Gear 26 First eccentric drive drum 28 Ring gear 30 Eccentric bearing part 32 Drive motor 34 Second Eccentric drum 36 Ring gear 38 Eccentric circumferential groove 40 Ring sleeve 42 Shield chamber 44 Screw conveyor 46 Shield jack 48 Segment

Claims (1)

(57) [Scope of request for utility model registration] The present invention has a deformed cutter head corresponding to a deformed section to be excavated, and a pair of rotary driving devices are provided at a target position from the center of the deformed cutter head. A first eccentric drive drum that is eccentrically arranged with respect to the center of rotation of the drum support and is driven to rotate, and a front portion of the first eccentric drive drum Is eccentric about the shield side that is driven by being mounted eccentrically rotatable with respect to its rotation center
A deformed shield excavator, comprising: a second eccentric drum for adjusting the amount of rotation, and a cutter head mounted on a front surface of the second eccentric drum.