JP2588649Y2 - 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 a tunnel excavator in which a worker can enter a spoke of a cutter head and work.

[0002]

2. Description of the Related Art Conventionally, a tunnel excavator for excavating a tunnel into the ground is provided with a cutter head which is rotated and driven by a cutter motor at a front portion of a shield body driven by a shield jack. A plurality of spokes are provided on the front surface of the cutter head in the radial direction, and a large number of cutters are mounted on both sides of the spokes, and the face in front of the cutter head is excavated with the rotation of the cutter head. At the same time, the excavated earth and sand is taken into the chamber behind the cutter head from the earth and sand intake opening opened in the front of the cutter head, and then discharged from the chamber by a screw conveyor or the like. It is configured to be carried backward.

On the other hand, when a tunnel is excavated in the ground such as a landfill, a paper drain or a pack drain laid in the ground to improve the ground becomes an obstacle and hinders the excavation. Note that the paper drain is a special synthetic fiber on the outside, and a board of about 10 cm in width formed of a polyolefin resin on the inside, which is intended to improve the ground by driving the board into the ground. A rod-shaped net made of polyethylene and filled with sand in a cylinder having a diameter of about 12 cm, which is laid underground to improve the ground. For this reason, there has been proposed a tunnel excavator in which a round blade cutter is provided in a spoke of a cutter head so that a drain material can be cut off before the cutter by the round blade cutter.

[0004]

However, in the conventional tunnel excavator, when the round blade cutter is worn or damaged due to the small cross-sectional area of the spokes, an operator goes forward of the cutter head and goes out of the round blade cutter. Had to be replaced, and there was a problem with danger in the work. In addition, in order for the worker to go forward of the cutter head, in order to prevent the face from collapsing and running out of water, the inside of the cutter head must be compressed and auxiliary construction methods such as improving the ground of the face must be used together, Due to the use of this auxiliary construction method, there were also problems such as a longer construction period and higher costs. The present invention has been made in order to improve the above-mentioned conventional problems, and has an object to provide a tunnel excavator in which a worker can enter a spoke and work by increasing a sectional area of the spoke. It is assumed that.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a tunnel excavator having a cutter head rotated by a cutter head motor at the front of a shield body propelled into the ground by a shield jack. In the machine, the cutter head has a large cross-sectional area, and is constituted by a plurality of hollow radial spokes and a hollow shaft having a large diameter at the center portion, and the spokes and the hollow space of the hollow shaft communicate with each other to form an integrated structure, A closed accommodation chamber having a round blade cutter opening and retracting hole is provided in a plurality of spokes.

[0006]

[Function] When the round blade cutter is broken or worn due to the above configuration, an operator can enter the spoke and replace the round blade cutter, so that the replacement work can be performed safely, and the falling of the face and the outflow of water can be prevented. It is not necessary to use an auxiliary construction method to perform the same.

[0007]

An embodiment of the present invention will be described in detail with reference to the drawings. 1 is a sectional view of a tunnel excavator, FIG. 2 is a front view of the same,
FIG. 3 is an enlarged view in the circle A of FIG. In these figures, 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 that is driven to rotate by a cutter head motor 3 is provided at a front portion of the shield body 1.

The front surface of the cutter head 4 is formed by a plurality of spokes 4a in a radial direction as shown in FIG. 2, and has a hollow shape having a large cross-sectional area so that an operator can work inside. ing. A large number of cutters 5 are mounted on both sides of the spokes 4a at intervals in the radial direction. With the rotation of the cutter head 4, the cutter 5 excavates a face in front of the cutter head 4. The earth and sand excavated by the cutter 5 is taken into a chamber 1a having a closed structure provided behind the cutter head 4 from an earth and sand intake 4b opened between the spokes 4a, and is formed on the rear surface of the spoke 4a of the cutter head 4. After being agitated by the protruding agitating blades 6, it is discharged from the chamber 1a by the screw conveyor 7, and further carried out to the rear of the shield main body 1 by an unshown discharging device. 1c indicates a manhole. A large-diameter cylindrical hollow shaft 4h is provided at the center of the cutter head 4.
Are provided integrally with the cutter head 4.

On the other hand, each spoke 4a of the cutter head 4
On the front surface, a rectangular opening 4c is opened at a position where the distance from the center of the cutter head 4 is sequentially changed. As shown in FIG. 3, a gate 10 which is opened and closed in the longitudinal direction of the spoke 4a by a gate jack 9 is provided inside the opening 4c, and a guide 4d for guiding the opening and closing of the gate 10 is provided at the tip of the guide 4d. The tip of the opening / closing lid 11 is in contact with the lid.

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

An input shaft 16 and an output shaft 17 interlocked via a chain 15 are rotatably supported on the arm 14 so as to be parallel to the radial direction of the cutter head 4. , A circular saw-shaped circular blade cutter 18 is detachably mounted.

The input shaft 16 is rotatably supported by the opening / closing lid 11 via a bearing, and the arm 14 is rotatable around the input shaft 11 in a range from the position where the round blade cutter is stored to the position where the round blade cutter is stored. In addition, one end of the input shaft 16 is connected to one end of a drive shaft 22 via a detachable universal joint 21. The other end of the drive shaft 22 is connected via a universal joint 24 to a cutter drive motor 23 mounted near the gate jack 9, so that the round blade cutter 18 can be driven to rotate by the cutter drive motor 23. ing.

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

Next, when the vehicle hits an obstacle such as a packed drain or a paper drain laid in the ground during excavation,
The gate 10 is opened by the gate jack 9 and the input shaft 1
The arm 14 is rotated about the center 6, and the round blade cutter 18 rotated by the cutter driving motor 23 projects from the opening 4 c of the spoke 4 a. 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 hermetically sealed chamber 1a through the earth and sand intake port 4b together with the earth and sand excavated by the cutter 5, then discharged from the chamber 1a by the screw conveyor 7, and further discharged by the earth discharging device (not shown). It is carried out backward.

On the other hand, if the round blade cutter 18 is damaged by colliding with an old seawall or a rock while cutting an obstacle, or is worn due to long-time use, the round blade cutter 18 is moved to the cutter housing 4 g.
And the gate 10 is closed, and the worker
From the manhole described above, advance into the spokes 4a, go to the front of the cutter housing chamber 4g, and open the opening / closing lid 11. Since the spokes 4a have a large cross-sectional area, the spokes 4a can be easily moved to the cutter housing chamber 4g side, and the opening / closing lid 11
Is opened, the round blade cutter 18 attached to the output shaft 17 is replaced with a new round blade cutter 18 and then the open / close lid 11 is replaced.
Is closed, and the round blade cutter 18 is advanced to the face side again, so that the excavation work can be resumed.

[0016]

As described in detail above, the present invention increases the cross-sectional area of the spokes provided radially on the front surface of the cutter head so that an operator can easily enter the spokes. Even if the round blade cutter provided inside is broken or worn out, the worker can enter the spoke and replace it, and it is necessary for the worker to go out of the cutter head and work as before. Absent. As a result, it is possible to replace the round blade cutter in a short time and safely, and it is not necessary to use an auxiliary method to prevent the face from collapsing or running out of water, so the construction period can be shortened and costs can be reduced. become.

[Brief description of the 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 one embodiment of the present invention.

FIG. 3 is an enlarged view of the inside of an A circle in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shield body 2 Shield jack 3 Cutter head motor 4 Cutter head 4a Spoke 4h Hollow shaft 18 Round blade cutter

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hidekazu Aoki 2-2-1-10 Nishibu, Katano-shi, Osaka (72) Inventor Hideki Hagiwara 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Hiroyuki Kawaguchi 1-2-3 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Hiroshi Tate 1-2-3 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Person Yoshihiro Taniguchi 1-2-3 Shibaura, Minato-ku, Tokyo Shimizu Corporation (56) References JP-A-62-111494 (JP, A) JP-A-62-197597 (JP, A) JP-A Sho 62-220695 (JP, A) (58) Field surveyed (Int. Cl. ⁶ , DB name) E21D 9/08

Claims (1)

(57) [Scope of request for utility model registration] A tunnel excavator provided with a cutter head (4) rotated by a cutter head motor (3) at the front of a shield body (1) propelled into the ground by a shield jack (2) . A plurality of hollow radial spokes (4 ) having a large cross-sectional area and a hollow
a) and a hollow shaft (4h) having a large diameter at the center portion, and the spokes (4a) and the hollow space of the hollow shaft (4h) communicate with each other to form an integrated structure.
(4a) Seal with round blade cutter (18) opening and closing hole in (4a)
A tunnel excavator characterized by having a closed accommodation room (4 g) .