JPH08270386A - Over-cutter device of shield machine - Google Patents

Abstract

PURPOSE: To provide an over-cutter having strength sufficiently bearing an outbreak work at a rock-bed or a hard land-bed, hardly deforming a rod advancing and retreating, and capably of executing outbreak surely and stably. CONSTITUTION: A roller cutter 12 capable of going in and out in the radial direction from the circumferential edge part of a cutter disc 2 of a shield machine is rotatably fitted to the extreme end part of the rod 11a of an expansion jack inner mounted in the radial direction of the cutter disc 2. The extreme end sides of arms 15 are rotatably and pivotally connected to both side brackets of the holding body 13 through pivot pins, and elliptical holes are formed on the basic end parts of the arms 15. By the pivot pins slidably inserted in the lengthwise direction along the elliptical holes, the basic end side of the arms are rotatably pivotally connected to the supporting plate of the entrance 2c of the cutter disc 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield machine equipped with a cutter disk provided in front of a shield machine used for excavating a tunnel so that a cutter bit can be radially moved in and out from a peripheral edge of the cutter disk. The present invention relates to an overcutter device (also referred to as a copy cutter device), and particularly to an overcutter device suitable for excavation (excess digging) in rock or hard land.

[0002]

2. Description of the Related Art In the above-described shield machine, a shield jack is extended while a cutter jack on a front surface of the machine having a cylindrical shield called a shield is extended, and the shield jack is extended behind the shield jack. The tunnel excavation work is performed by advancing with a reaction force against the segment wall or the like. In addition, of the multiple shield jacks, the shield jack in the opposite direction was greatly extended compared to the shield jack in the direction to be curved, so that the excavator body was curved by changing the forward direction. Tunnel excavation becomes possible. In the case of such excavation work, normally, the ground on the side where the excavator curves is extra excavated, that is, overcut. The prior art of this kind of overcutter device includes Japanese Utility Model Application Laid-open No.
No. 598, JP-B-63-3831.
There is an apparatus described in Japanese Patent Laid-Open Publication No. 6-206.

[0003] In the former, a roller cutter (bit) is rotatably held by a holder in an inclined state, and the holder is attached to a front peripheral edge of a cutter disk, and an outer peripheral portion of the roller cutter is attached to a shield excavator body. It has a structure in which a cylinder device that swingably supports the holding body so as to swing freely so as to move in and out is provided.

In the latter, a flat scraper is fixed to the cutter bit of the overcutter device on the surface opposite to the forward direction of the shield machine, in parallel with the cutter disk surface.
It has a structure in which excavation debris during overcut is easily scraped into the cutter chamber.

[0005]

However, each of the above-mentioned conventional overcutter devices has technical problems to be improved in the following points.

[0006] The former is equipped with a roller cutter as a cutter bit, and is suitable for excavation on rock or hard ground. However, the protruding stroke of the roller cutter during overcutting is small, and the excavation efficiency during extra excavation is poor. Further, when the roller cutter is projected outward through the cylinder device, the roller cutter swings around the pivot point, so the direction of the blade changes depending on the degree of projection, and the excavation work is not stable.

In the latter, the structure of the cutter bit is not suitable for hard ground such as rock, and a plate-shaped support member is provided in the center of the bit to support the cutter bit. Is on the tip side of the rod of the telescopic jack and does not support the rod.
The reaction force cannot be sufficiently supported against excavation in rock or hard ground, and for example, the rod is deformed or damaged, so that the rod cannot be advanced or retracted. Further, it is difficult to support a roller cutter suitable for excavating rock with a plate-shaped support member.

The present invention has been made in view of the above-mentioned points, and has a strength enough to withstand the excavation work on a rock or hard ground. It is an object of the present invention to provide an overcutter device for a shield excavator, which can be performed.

[0009]

In order to achieve the above object, the overcutter device of the present invention comprises: a) a shield excavator equipped with a cutter bit in a radial direction from a peripheral edge of a cutter disk of a shield excavator. In the overcutter device of the machine, b) a roller cutter is used as the cutter bit, and this roller cutter is rotatably attached to the rod tip portion of the telescopic jack installed in the radial direction of the cutter disc, and c) the attachment portion Both sides and both sides of the roller cutter entrance / exit of the cutter disk are connected by arms, respectively, and d) the connecting portion of each arm is rotatably supported, and e) at least one connecting portion of the arm is It is configured to be movable in a predetermined length in the longitudinal direction.

According to a second aspect of the present invention, f) one end of the arm is pivotally connected with a pin, an oval hole is formed in the other end of the arm, and the arm can slide along the oval hole. It may be pivotally connected with a pin.

As described in claim 3, g) a scraper cutter can be attached to the arms on both sides.

According to a fourth aspect of the present invention, in a) an overcutter device for a shield machine having a cutter bit that can be freely moved in and out from a peripheral edge of a cutter disk of the shield machine, b) a roller as the cutter bit. Using a cutter, this roller cutter is rotatably attached to the rod tip part of the telescopic jack installed in the radial direction of the cutter disc, and c) both sides of the attachment part and both sides of the roller cutter entrance / exit of the cutter disc. May be connected by respective arms, and both side connecting parts of each arm may be pivotally supported d '), and e') the arms may be configured to be extendable and retractable in the longitudinal direction by a predetermined length.

[0013]

According to the overcutter device of the present invention having the above construction, the rod of the telescopic jack is extended at the time of overcutter, and the roller cutter at the tip is projected in the radial direction from the peripheral edge of the rotating cutter disk. Since the both sides of the roller cutter and both sides of the entrance and exit of the roller cutter are supported by the respective arms, the rod is reinforced, and the roller cutter is securely held at the projecting position. When the roller cutter comes into contact with the natural ground and the overexcavation work is started, with respect to the contact of the front surface of the roller cutter, both arms support the excavation reaction force,
The excavation reaction force when one side surface of the roller cutter contacts the ground and rotates is mainly supported by the arm on the rotation direction side. As a result, the excavation reaction force conventionally supported entirely by the rod is shared by the arm, and the load acting on the rod is reduced. Therefore, even when performing an excavation work on hard ground such as rock or hard ground, deformation of the rod of the telescopic jack and damage to the roller cutter due to the deformation of the rod are prevented.

According to the overcutter device of the second aspect, when the rod of the telescopic jack is extended, at the same time as the roller cutter mounting portions at the ends of the arms on both sides move forward,
The pin relatively slides along the longitudinal direction of the oval hole, and the arm is stretched between the roller cutter mounting portion at the tip of the rod and the side of the roller cutter entrance and exit of the cutter disk, so that a load is applied to the roller cutter. When actuated, it holds the roller cutter in place and supports and reinforces the rod. On the other hand, when the rod is contracted, the roller cutter attachment parts of the arms on both sides retract, and at the same time the pins relatively slide along the longitudinal direction of the oval hole so that the base ends of the arms expand to both sides. It slides on and is stored in the cutter disk.

According to the third aspect of the present invention, when the rod is extended and the roller cutter projects radially from the peripheral edge of the cutter disk, the scraper cutter also projects from the peripheral edge of the cutter disk. In this state, when the cutter disc rotates, the ground is also scraped off by the scraper cutter, and the soil excavated by the roller cutter and accumulated in the rotation direction side of the cutter disc is guided by the scraper cutter, It is taken in (in the cutter chamber of the shield machine).

According to the overcutter device of the fourth aspect, the arms on both sides hold the roller cutter in the overdrilling work position and support the rod by an action substantially similar to that of the device of the first aspect at the time of overcutting. Although the load is reduced by the device of the present invention, there is a difference that the arm itself extends when the rod extends and returns to the original state when the rod contracts.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an overcutter device according to the present invention will be described below with reference to the drawings.

FIG. 1 schematically shows a front end portion of a shield machine equipped with an overcutter device of the present embodiment.
It is the OO sectional view taken on the line of (a). 2 (a) is a front view showing a part of the cutter disk of FIG. 1, and FIG. 2 (b) is a view in the direction a of FIG. 2 (a). FIG. 3A is an enlarged front view showing a tip portion of the overcutter device, and FIG. 3B is a view taken along line bb of FIG. 3A.

As shown in FIG. 1, a cutter disc 2 having two face plates 2a is rotatably provided on a front end face of a shield machine 1 at an interval in front and rear. As shown in FIG. 2, the cutter disk 2 has a cross-shaped opening 3 formed radially from the center. A pair of parallel frames 4 are disposed in the opening 3, and a large number of cutter bits 5 are planted at intervals along the outer edge of each frame 4. A plurality of pairs of orthogonal frames 6 are arranged between the frames 4 at intervals in the longitudinal direction, and a roller cutter 7 is rotatably supported between the frames 6 of each pair. .

An opening 8 is formed between the openings 3 near the outer peripheral edge of the cutter disk 2, and a pair of parallel frames 9 are also arranged in the opening 8, and along the outer edge of each frame 9. A number of cutter bits 10 are implanted at intervals. In the space between the face plates 2a in the frame 9, a hydraulic expansion / contraction jack 11 is pivotally attached to the support member 2b at its base end side as shown in FIG. 1 so that it can be extended outward in the radial direction of the cutter disk 2. It is distributed. An entrance / exit 2c for the rod 11a of the telescopic jack 11 to enter and exit is provided on the outer peripheral edge of the cutter disk 2, and an overcut roller cutter 12 is attached to the tip of the rod 11a. As shown in FIG. 3, the roller cutter 12 is rotatably supported in a holding body 13 provided with a bearing (not shown) by tilting forward and downward, and the lower end of the holding body 13 is attached to the tip of a rod 11a. Fixed.

A pair of pentagonal support plates 14 are disposed on both sides of the entrance 2c of the cutter disk 2 at an interval in the front and rear, respectively.
The base end side of 5 is pivotally connected by a pivot pin 16 so as to be rotatable. In this example, an oval hole 17 is formed at the base end of the arm 15, and the pivot pin 16 is slidably inserted in the longitudinal direction along the oval hole 17. The distal end of the arm 15 is pivotally connected to brackets 18 on both sides of the holder 13 by pivot pins 19, respectively. Each arm 1
A slightly triangular scraper cutter 20 is fixed to the tip of the intermediate position 5 with a stopper 20a so as to protrude radially outward.

As shown in FIG. 3 (b), the holder 13 has a projection 13a projecting from the front surface thereof.
When 1a is fully contracted, it is guided and pulled in by the front and rear face plates 2a, and the protrusion 13a contacts the upper end of the front face plate 2a as shown in FIG. Then, in this state, the roller cutter 12 and the scraper cutter 20 are completely drawn into the cutter disk 2 and stored. On the other hand, when the rod 11a of the telescopic jack 11 is fully extended,
The roller cutter 12 and the scraper cutter 20 protrude from the outer peripheral edge of the cutter disk 2, so that the excavation work can be performed. Further, in this state, the arm 15 advances to the maximum with respect to the pivot pins 16 of the support plates 14 on both sides, and the oblong hole 1
The pivot pin 16 contacts the base end of the arm 7, and each arm 15 is stretched. Therefore, the roller cutter 12 is supported at three points, namely, the lower rod 11a and the arms 15 on both sides,
Holds firmly in place. Note that reference numerals 21 and 22 in FIG. 1 denote roller cutters, respectively.

Although one embodiment of the overcutter device has been described above, the overcutter device of the present invention can be implemented as follows.

1) An elliptical hole 17 is formed on the tip end side of the arm 15, and the base end side is rotatably connected to the support plate 14 by a pivot pin 16.

2) The arm 15 is divided into two parts in the longitudinal direction, and the divided arms are connected so as to be extendable and contractible in the longitudinal direction to form an arm. Both ends of the arm are pivotally connected to the bracket 18 and the support plate 14, respectively. Connect rotatably with support pins.

3) Attach the scraper cutter 20 to the arm 1
Remove from 5.

[0027]

As is apparent from the above description,
The overcutter device of the present invention has the following excellent effects.

(1) Excavation reaction force that acts on the rod of the telescopic jack is shared by the arm, and the load on the rod is reduced, so even if extra excavation work is performed on hard ground such as rock or hard ground The deformation of the jack rod and the damage of the roller cutter due to the deformation of the rod are prevented. Excavation can be performed reliably and stably even on rock or hard ground.

(2) In the apparatus according to the second aspect, the pin relatively slides along the longitudinal direction of the oval hole corresponding to the forward / backward movement of the rod of the telescopic jack, the arm moves smoothly, and When cutting, securely support and reinforce the rod.

(3) In the device according to the third aspect, the scraper cutter also protrudes from the peripheral edge of the cutter disk at the time of overcut, and scrapes the ground to assist the excavation work and guides the earth and sand excavated by the roller cutter. To facilitate incorporation into the cutter disk.

(4) The device according to the fourth aspect has a structural difference that the arm expands and contracts in accordance with the advance and retreat of the roller cutter, but the effect of the above (1) is the same as in the device according to the first aspect. is there.

[Brief description of drawings]

FIG. 1 schematically shows a front end portion of a shield machine equipped with an overcutter device according to an embodiment of the present invention.
It is the OO sectional view taken on the line of (a).

2 (a) is a front view showing a part of the cutter disk shown in FIG. 1, and FIG. 2 (b) is a view taken in the direction of arrow a in FIG. 2 (a).

3 (a) is an enlarged front view showing a tip portion of the overcutter device, and FIG. 3 (b) is a view taken along the line bb of FIG. 3 (a).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shield excavator 2 Cutter disk 2c entrance and exit 4.6 frame 11 Telescopic jack 11a rod 12 Roller cutter 13 Holder 14 Support plate 15 Arm 16/19 Pivot pin 17 Oval hole 20 Scraper cutter

Claims (4)

[Claims] 1. An overcutter device for a shield excavator provided with a cutter bit so as to be able to freely enter and exit in a radial direction from a peripheral portion of a cutter disk of the shield excavator, wherein a roller cutter is used as the cutter bit, and the roller cutter is used as the cutter. Rotatably attached to the rod end of a telescopic jack installed in the radial direction of the disk, both sides of the mounting portion and both sides of the roller cutter entrance and exit of the cutter disk are connected by arms, respectively, and each arm is connected. An overcutter device for a shield excavator, wherein the portion is rotatably pivotally supported, and at least one connecting portion of the arm is configured to be movable by a predetermined length in the longitudinal direction of the arm. 2. An arm is pivotally connected at one end with a pin, an oval hole is formed at the other end of the arm, and the arm is pivotally connected along a pin slidable along the oval hole. 2. An overcutter device for a shield machine according to claim 1. 3. The overcutter device for a shield machine according to claim 1, wherein a scraper cutter is attached to each of the arms on both sides. 4. An over-cutter device for a shield excavator provided with a cutter bit so as to be able to freely enter and exit in a radial direction from a peripheral portion of a cutter disk of the shield excavator, wherein a roller cutter is used as the cutter bit. Attached rotatably to the rod end of a telescopic jack housed in the radial direction of the disc, both sides of the mounting portion and both sides of the roller cutter entrance and exit of the cutter disc are connected by arms, and both sides of each arm. An overcutter device for a shield excavator, characterized in that the connecting portion is rotatably pivotally supported and the arm is configured to be extendable and retractable in a longitudinal direction thereof by a predetermined length.