JPH06167192A - Tunnel excavator - Google Patents

Abstract

PURPOSE:To make it possible to easily remove obstacles such as drain materials, etc., built in the ground. CONSTITUTION:In a tunnel excavator providing a cutter head 4 rotated by a cutter head motor 3 to the front of a shield body 1 driven into the ground by a shield jack 2, a plurality of cutter storing chambers 4g are provided to positions different from the center of the cutter head 4 in the cutter head mentioned above. Round edge cutters 18 rotated and driven by a driving motor 23 are provided to the insides of the cutter storing chambers 4g so that they are capable of moving forward of the cutter head 4, the tunnel excavator cuts obstacles such as drain materials, etc., preceding to a cutter 5 provided to the front of the cutter head 4, so that the obstacles can be removed without interrupting excavation work.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tunnel excavator equipped with a round blade cutter for cutting an obstacle such as a drain material laid underground.

[0002]

2. Description of the Related Art Conventionally, a tunnel excavator for excavating a tunnel into the ground has a cutter head, which is rotationally driven by a cutter motor, at the front of a shield body propelled by a shield jack. A large number of cutters are attached to the front surface of the cutter head, and the cutting face in front of the cutter head is excavated as the cutter head rotates, and the excavated earth and sand is opened in the front surface of the cutter head. After being taken into the chamber behind the cutter head through the earth and sand inlet, it is discharged from the chamber by a screw conveyor or the like, and further carried out behind the shield body by the earth discharging device.

On the other hand, when excavating the inside of a landfill with a tunnel excavator, paper drains, packed drains, etc. are laid in the ground to improve the ground, and these are obstacles for excavating the tunnel. Become. The paper drain is a special synthetic fiber on the outside and a board with a width of about 10 cm formed of a polyolefin resin on the inside is placed in the ground to improve the ground, and the packed drain is This is a rod-shaped net body made of polyethylene and having a diameter of about 12 cm and filled with sand, and the ground is improved by laying it in the ground.

[0004]

Conventionally, when an obstacle such as a packed drain or a paper drain is hit during excavation of a tunnel, the cutter head tears off these obstacles and winds them around the cutter to cause an excavation obstacle. . Also, pulling down the sand packed in the drain material may cause ground subsidence, etc.Therefore, the excavation of the tunnel excavator is temporarily stopped, the worker enters in front of the cutter head, and the drain material is manually loaded. Have been removed. For this reason, there is a problem in that the work is dangerous and the excavation of the tunnel is interrupted while the drain material is being removed, resulting in extension of the construction period. The present invention has been made in order to improve such conventional problems, and an object thereof is to provide a tunnel excavator capable of removing obstacles such as drain material by shredding.

[0005]

In order to achieve the above object, the present invention provides tunnel excavation in which a cutter head rotated by a cutter head motor is provided at a front portion of a shield body propelled into the ground by a shield jack. In the machine, a plurality of cutter accommodating chambers are provided in the cutter head at positions radially different from the center of the cutter head, and in these cutter accommodating chambers, a circular blade cutter rotationally driven by a cutter driving motor. Is provided so as to be movable back and forth in a direction orthogonal to the face plate of the cutter head.

[0006]

With the above structure, since the round blade cutter shreds obstacles such as drain material prior to the cutter, even if it hits obstacles such as drain material, the tunnel will not be removed artificially. You can continue to drill.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the drawings. 1 is a sectional view of the tunnel excavator, FIG. 2 is a front view of the same,
3 is a sectional view taken along the line AA of FIG. 2, and FIG. 4 is a sectional view of FIG.
A sectional view taken along the line B is shown. In these drawings, reference numeral 1 denotes a shield body, which is propelled into the ground by a plurality of shield jacks 2 provided along the inner peripheral surface.
A cutter head 4 which is rotationally driven by a cutter head motor 3 is provided at the front part of the shield body 1.

The front surface of the cutter head 4 is shown in FIG.
Is formed by a plurality of spokes 4a in the radial direction.
The front of the cutter head on both sides of these spokes 4a.
A number of more protruding cutters 5 are radially spaced
It is attached and these are accompanied by the rotation of the cutter head 4.
I will excavate the face in front of the cutter head 4 with the cutter 5.
The soil excavated by the cutter 5 is
From the earth and sand intake 4b opened between the spokes 4a,
Inside the chamber 1a having a closed structure provided behind the head 4
Incorporated into the cutter head 4 and projected on the rear surface of the spoke 4a of the cutter head 4.
After being stirred by the stirring blade 6
Is discharged from the inside of the chamber 1a by the ear 7 and further illustrated.
It is carried out to the rear of the shield body 1 by a non-excavator.
It is like this.

On the other hand, each spoke 4a of the cutter head 4
On the front surface, a rectangular opening 4c is formed at a position where the distance from the center of the cutter head 4 is sequentially changed in the radial direction. Inside the openings 4c, as shown in FIG. 7, a gate 10 that is opened and closed by a gate jack 9 in the longitudinal direction of the spokes 4a is provided to open and close the openings 4c. Inside the opening 4c, a guide 4d for guiding the opening and closing of the gate 10, an opening / closing lid 11 and a spoke 4a.
A round blade cutter accommodating chamber 4g is formed by a blocking plate that traverses the blade.

The opening / closing lid 11 has a base end pivotally attached to a bracket 4f projecting from a rear surface plate 4e of the spoke 4a by a pin 12 and pivoted about the pin 12 to open a cutter accommodating chamber 4g. It can be opened.
The cutter accommodating chamber 4g is provided for each opening 4c of each spoke 4a, and the arm 14 formed of a chain case is installed therein.

An input shaft 16 and an output shaft 17 which are interlocked via a chain 15 are rotatably supported by the arm 14 so as to be parallel to the radial direction of the cutter head 4, and one end of the output shaft 17 is supported. A circular saw blade-shaped cutter 18 provided with a large number of chips 18b is detachably attached around the disk 18a as shown in FIG.
The round blade cutter 18 has a circular plate 1 as shown in FIG. 5B for improving the wear resistance of the lower part of the neck of the tip 18b.
The plate thickness t of 8a is formed thicker than that of a normal concrete cutter.

On the other hand, the input shaft 16 is rotatably supported by the opening / closing lid 11 via a bearing 20, and the arm 14 is centered on the input shaft 16 and shown by a solid line in FIG. The input shaft 16 is rotatable in the range of the protruding position, and one end of the drive shaft 22 is connected to one end of the input shaft 16 via a separable universal joint 21. The other end of the drive shaft 22 is connected to a cutter drive motor 23 mounted near the gate jack 9 through a universal joint 24 so that the cutter drive motor 23 can rotationally drive the round blade cutter 18. ing.

In FIG. 1, reference numeral 25 indicates that muddy water or water is jetted toward the round blade cutter 18 accommodated in the cutter accommodating chamber 4g, so that the periphery of the constantly rotating round blade cutter 18 is not filled with misalignment. With such a spray nozzle, it is possible to prevent unnecessary wear of the round blade cutter 18.

The operation will be described next. When excavating a tunnel in the ground such as a landfill, first, the cutter head 4 is rotated by the cutter head motor 3 while the shield body 1 is propelled into the ground by the shield jack 2. Let
The face in front of the cutter head 4 is excavated by the cutter 5.
At this time, the opening 4c on the front surface of the spoke 4a is closed by the gate 10, and the round blade cutter 18 is stored in the cutter accommodating chamber 4g.

Next, when an obstacle such as a pack drain or a paper drain laid in the underground is hit,
Open the gate 10 with the gate jack 9 and input shaft 1
6, the arm 14 is rotated to the position shown in FIG.
From the openings 4c of the spokes 4a, the cutter drive motor 23
The circular blade cutter 18 rotated by is projected. Then, as the cutter head 4 rotates, the drain material, which is an obstacle, is cut prior to the cutter 5. The cut drain material is taken into the chamber 1a having a closed structure from the earth and sand inlet 4b together with the earth and sand excavated by the cutter 5, and then discharged from the chamber 1a by the screw conveyor 7 and further by an earth discharging device (not shown). It is carried out to the rear.

On the other hand, when the circular blade cutter 18 is stored in the cutter accommodating chamber 4g after passing through the formation provided with the drain material as described above, the gate jack 9 is used to store the gate 10.
To close. In addition, a round blade cutter 18 in the cutter accommodating chamber 4g
After being stored, the ejection nozzle 2 is rotated while rotating as necessary.
Since it is further washed by muddy water and water jetted from 5,
Maintenance work becomes easier.

[0017]

As described in detail above, according to the present invention, since the front of the cutter head is provided with the round blade cutter for cutting obstacles such as drain material prior to the cutter for excavating the face, it is Even if you hit the drain material while excavating in the ground of a landfill where a packed drain or paper drain was laid, you can continue the excavation as it is, and you can interrupt the excavation as in the past and let the operator remove the artificial drain material. No removal work is required. As a result, the work safety and the construction period can be shortened, and the cutter does not pull in the drain material or the sand packed in the drain material, so that the ground subsidence does not occur. Also, by storing the round blade cutter in the cutter storage chamber after passing obstacles such as drain material, the round blade cutter will not be damaged or unnecessarily worn by rocks, etc. You will be able to improve.

[Brief description of drawings]

FIG. 1 is a sectional view of a tunnel excavator according to an embodiment of the present invention.

FIG. 2 is a front view of a tunnel excavator according to an embodiment of the present invention.

3 is a sectional view taken along the line AA of FIG.

4 is a cross-sectional view taken along the line BB of FIG.

FIG. 5 (a) is a plan view of a round blade cutter provided in a tunnel excavator according to an embodiment of the present invention. (B) It is the same sectional view.

FIG. 6 is an operation explanatory view of the round blade cutter provided in the tunnel excavator according to the embodiment of the present invention.

7 is a cross-sectional view taken along the line CC of FIG.

[Explanation of symbols]

 1 Shield main body 2 Shield jack 3 Cutter head motor 4 Cutter head 4c Opening 4g Cutter storage chamber 5 Cutter 9 Gate cylinder 10 Gate 18 Round blade cutter 23 Cutter drive motor 25 Jet nozzle

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Norio Itoi 5-8-4 Nishi-Kamata, Ota-ku, Tokyo (72) Inventor Hidekazu Aoki 2-2-1-10 Nishi, Private Section, Katano City, Osaka Prefecture (72) Inventor Hideki Hagiwara, Shimizuura 1-3-2 Shibaura, Minato-ku, Tokyo (72) Inventor Hiroyuki Kawaguchi 1-2-3 Shibaura, Minato-ku, Tokyo Shimizu Construction, Inc. (72) Inventor, Hiroshi Tate In Shimizu Construction Co., Ltd. 1-3-2 Shibaura, Minato-ku, Tokyo (72) Inventor Sadahiro Taniguchi 1-3-2 Shimizu Co., Ltd. Minato-ku, Tokyo

Claims (4)

[Claims] 1. A tunnel excavator having a cutter head 4 rotated by a cutter head motor 3 at a front portion of a shield body 1 propelled into the ground by a shield jack 2. Storage room 4g
And a round blade cutter 18 which is rotationally driven by a cutter driving motor 23 is provided in the cutter accommodating chamber 4g so as to be able to move forward and backward in front of the cutter head 4. 2. The cutter accommodating chamber 4g is a cutter head 4
2. The tunnel excavator according to claim 1, wherein the tunnel excavator is provided in the cutter head 4 at a position different in distance from the center of the. 3. A front opening 4c of the cutter accommodating chamber 4g,
The tunnel excavator according to claim 1, further comprising a gate 10 that is opened and closed by a gate cylinder 9. 4. The tunnel excavator according to claim 1, wherein a jet nozzle 25 for jetting water toward the round blade cutter 18 is provided in the vicinity of the round blade cutter 18 housed in the cutter housing chamber 4g.