JP3117381B2 - Obstacle cutting device for tunnel excavator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an obstacle cutting device for a tunnel excavator such as a shield excavator.

[0002]

2. Description of the Related Art FIG. 4 shows a general shield machine.
As shown in the figure, a shield machine for excavating the ground is provided with a cutter head 31 at the front of a cylindrical excavator body 30.
Is rotatably mounted. This cutter head 31
Is a cutter bit 3 that excavates the ground (sediment) in front of it
2 are fixed. A ring gear 34 is fixed to a rear portion of the cutter head 31 via an intermediate beam 33, and a drive gear 36 of a cutter turning drive motor 35 attached to the excavator body 30 meshes with the ring gear 34. In the excavator body 30, a chamber 38 is formed between the cutter head 31 and the bulkhead 37. The chamber chamber 38 has a mud pipe 39 and a mud pipe 4
0 is conducted. In the figure, reference numeral 41 denotes a propulsion jack.

Therefore, in order to excavate and form a tunnel, a plurality of propulsion jacks 41 are operated to advance the excavator body (front body) 30 while the cutter head 31 is turned by a cutter turning drive motor 35. Then, the ground is excavated by the cutter bit 32. The earth and sand excavated by the cutter bit 32 is taken into the chamber 38, stirred and mixed with the muddy water from the mud feeding pipe 39, and discharged to the outside by the mud discharging pipe 40.

Meanwhile, in such a shield excavator, there is one in which an obstacle cutting device is assembled to the cutter head 31. For example, as shown in FIG. 5 , a fixed type cutter bit 42 for cutting an obstacle is disposed in front of the cutter head 31 similarly to the cutter bit 32 for earth and sand digging. Was cutting.

[0005]

However, when the cutter bit for cutting the obstacle is fixed on the cutter head and the obstacle is cut by the rotational force of the cutter head, there are the following problems. Was. There is a possibility that the cutter bit for cutting an obstacle will be worn when excavating earth and sand, and cannot be cut when cutting an obstacle. When cutting an obstacle, the cutter bit for earth and sand excavation is damaged, and continuous excavation becomes impossible. When the hardness of the obstacle is high, the biting amount of the bit decreases, so that the cutting speed (digging speed at the time of cutting the obstacle) decreases.

SUMMARY OF THE INVENTION An object of the present invention is to provide an obstacle cutting device for a tunnel excavator capable of improving the cutting efficiency of an obstacle cutting cutter and preventing abrasion and damage.

[0007]

In order to solve the above-mentioned problems, an obstacle cutting device for a tunnel excavator according to the present invention comprises:
In a tunnel excavator in which a cutter head provided with a large number of cutter bits is rotatably mounted at a front portion of an excavator body, an obstruction capable of rotating independently of a cutter bit for earth and sand excavation is provided inside the cutter head. things cutting cutter, the
Equipped parallel to the front of the cutter head, it can move forward and backward,
By rotating the cutter head, the cutting area is
So that it overlaps the cutting range of the cutter for cutting obstacles
In addition, the radial mounting position is determined .

[0008]

[0009]

The obstacle cutting cutter has a structure that can be rotated independently of the cutter head, so that even hard obstacles can be cut at a high speed, thereby increasing the cutting speed. In addition, by making the cutter for obstacle cutting into a structure that can be stored in the cutter head during normal earth and sand excavation, it is possible to prevent wear of the cutter for obstacle cutting due to earth and sand excavation. Of the cutter can be prevented from deteriorating. At the time of cutting the obstacle, the collision between the obstacle and the cutter bit for earth and sand digging can be avoided by projecting the cutter for cutting the obstacle ahead of the cutter bit for earth and sand digging.

[0010] In addition, by rotating the cutter head and selecting a cutter for cutting an obstacle, it becomes possible to cut an obstacle in the entire cross section of the front surface of the cutter head.

[0011]

An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a side sectional view of a main part of a first embodiment in which the obstacle cutting device is applied to a shield machine, FIG. 2 is an overall side sectional view, and FIG. 3 is a front view of a cutter head.

As shown in the figure, a cutter head 6 is rotatably mounted on a front portion of a shield body 13 via an intermediate beam 15 penetrating a bulk head 14. A large number of cutter heads 6 are provided on the front surface of the cutter head 6. Cutter bit 9 for earth and sand excavation
Are fixed, and a number of obstacle cutting cutters 1 are attached to be able to move forward and backward (extend and retract).

That is, the cutter 1 for cutting an obstacle is
The motor 5 is connected to the motor 5 via a speed reducer 4, and the motor 5 is driven to rotate. The rotating shaft 3 is supported by the guide inner cylinder 2 via a bearing 12, and is fixed to the front plate of the cutter head 6.
1 is slidable.

The reduction gear 4 is fixed to a slide base 10 via a bracket, and is slidably connected to a support base 8. The slide base 10 is connected to the tip of the piston rod of the hydraulic jack 7 whose base end is connected to the front plate of the cutter head 6.

Accordingly, the obstacle cutting cutter 1 is driven to rotate independently of the cutter head 6 by the rotation of the motor 5, and moves forward and backward by the expansion and contraction of the hydraulic jack 7, so that when the obstacle is cut, the cutter bit for earth and sand digging is cut. 9 (see a two-dot chain line in FIG. 2), and is stored in the cutter head 6 when excavating earth and sand (see a solid line in FIG. 2).

Further, the cutting position of the obstacle cutting cutter 1 is determined by rotating the cutter head 6 such that the cutting range overlaps with the cutting range of the adjacent obstacle cutting cutter 1 in the radial direction. , So that the cutter head 6 is rotated, and the obstacle cutting cutter 1 is projected.
By appropriately selecting, it is possible to cut an obstacle in the entire cross section of the front surface of the cutter head 6.

[0017]

[0018]

[0019]

[0020]

As described above, according to the present invention, the following effects can be obtained. By rotating the cutter for obstacle cutting at high speed with a single rotating mechanism independent of the cutter head rotating device,
The cutting speed can be increased and the cutting efficiency can be improved. Since the obstacle cutting cutter has a structure capable of being stored in the cutter head, wear and damage of the obstacle cutting cutter during earth and sand excavation can be prevented.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a main part of a first embodiment in which the obstacle cutting device is applied to a shield machine.

FIG. 2 is an overall side sectional view of the same.

FIG. 3 is a front view of the cutter head.

FIG. 4 is a side sectional view of the shield machine.

FIG. 5 is a side sectional view of a conventional cutter head.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Obstacle cutting cutter 2 Guide inner cylinder 3 Rotating shaft 4 Reducer 5 Motor 6 Cutter head 7 Hydraulic jack 8 Supporting gantry 9 Cutter bit for earth and sand cutting 10 Slide gantry 11 Guide outer cylinder 12 Bearing 13 Shield body 14 Bulkhead 15 Intermediate beam

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-7-4181 (JP, A) JP-A-8-189294 (JP, A) JP-A-6-167192 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) E21D 9/08

Claims (1)

(57) [Claims] 1. A tunnel excavator in which a cutter head provided with a number of cutter bits is rotatably mounted on a front portion of an excavator body, wherein a cutter bit for earth and sand excavation is provided inside the cutter head. Equipped with a rotatable obstacle cutting cutter parallel to the front of the cutter head,
Flexible and the cutting range rotates the cutter head
The cutting range of adjacent obstacle cutting cutters
An obstacle cutting device for a tunnel excavator whose radial mounting position is determined to overlap .