JPH0646098U - Tunnel excavator - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a tunnel excavator in which a worker can safely perform round blade cutter replacement work by allowing workers to enter the spokes provided in the cutter head. [Construction] In a tunnel excavator in which a cutter head 4 rotated by a cutter head motor 3 is provided in a front portion of a shield body 1 propelled into the ground by a shield jack 2, a cross-sectional area is formed in front of the cutter head 4. A plurality of large and hollow spokes 4a are provided in the radial direction, a hollow shaft 4h having a large diameter is integrally provided with the cutter head 4 at the center of the cutter head 4, and each of the spokes 4 is provided.
A round-blade cutter 18 is provided in the inside of a so as to be able to move forward and backward in front of the cutter head. When the round-blade cutter 18 is damaged or worn, an operator enters the spoke 4a and the round-blade cutter 1
8 can be exchanged safely.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a tunnel excavator in which a worker can enter a spoke of a cutter head to perform work.

[0002]

[Prior art]

 Conventionally, a tunnel excavator for excavating a tunnel into the ground has a cutter head, which is driven to rotate by a cutter motor, in front of a shield body propelled by a shield jack. In addition, a plurality of spokes are provided in the radial direction on the front surface of the cutter head, and a large number of cutters are attached to both sides of these spokes, and the face in front of the cutter head is excavated as the cutter head rotates. At the same time, the excavated earth and sand are taken into the chamber behind the cutter head through the earth and sand inlet on the front of the cutter head, and then discharged from the chamber by the screw conveyor, etc. It is configured to be carried out rearward.

On the other hand, when excavating a tunnel in the ground such as a landfill, a paper drain or a packed drain laid in the ground for ground improvement becomes an obstacle, which hinders the excavation. The paper drain is a special synthetic fiber on the outside and a board with a width of about 10 cm, which is made of polyolefin resin on the inside, is placed in the ground to improve the ground, and the packed drain is It is a rod-shaped net body made of polyethylene and having a diameter of about 12 cm, which is filled with sand, and is laid in the ground to improve the ground. Therefore, a tunnel excavator has been proposed in which a round blade cutter is provided in the spokes of the cutter head so that the drain material can be cut off by the round blade cutter prior to the cutter.

[0004]

[Problems to be solved by the device]

 However, in a conventional tunnel excavator, the cross-sectional area of the spokes is small, so if the round-blade cutter becomes worn or damaged, the operator has to go out in front of the cutter head and replace the round-blade cutter. There was a problem with work that was dangerous. In addition, in order for the worker to go out in front of the cutter head, in order to prevent the face from collapsing and water from coming out, it is necessary to use auxiliary construction methods such as pressurizing the inside of the cutter head and improving the ground of the face. However, due to the combined use of this auxiliary construction method, there were problems such as a longer construction period and higher costs. The present invention has been made to solve the above-mentioned conventional problems, and an object thereof is to provide a tunnel excavator in which an operator can enter the spokes and work by enlarging the cross-sectional area of the spokes. It is what

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, this invention is a tunnel excavator in which a cutter head rotated by a cutter head motor is provided in the front part of a shield body propelled into the ground by a shield jack, in front of the cutter head. A plurality of hollow spokes with a large cross-sectional area are provided in the radial direction, a hollow shaft with a large diameter is integrated with the cutter head at the center of the cutter head, and a round blade cutter is provided in each spoke. It is provided so that it can move forward and backward in front of the head.

[0006]

[Action]

 With the above configuration, if the round blade cutter is damaged or worn, an operator can enter the spokes and replace the round blade cutter, so the replacement work can be performed safely, and the falling face and falling water can be prevented. There is no need to use auxiliary construction methods together.

[0007]

【Example】

 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, and FIG. 3 is an enlarged view of a circle A in FIG. In these figures, 1 is 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.

As shown in FIG. 2, the front surface of the cutter head 4 is formed by a plurality of spokes 4a in a radial direction, and has a hollow shape with a large cross section so that an operator can enter inside and work. Has become. A large number of cutters 5 are mounted on both sides of these spokes 4a at intervals in the radial direction, and as the cutter head 4 rotates, these cutters 5 excavate the face in front of the cutter head 4. The soil excavated by the cutter 5 is taken into the chamber 1a of the closed structure provided behind the cutter head 4 through the earth and sand inlets 4b opened between the spokes 4a, and the spokes 4a of the cutter head 4 are removed. After being stirred by a stirring blade 6 projecting from the rear surface, it is discharged from the chamber 1a by a screw conveyor 7 and further discharged to the rear of the shield body 1 by an unillustrated earth discharging device. At the center of the cutter head 4, a hollow cylindrical hollow shaft 4h having a large diameter is provided integrally with the cutter head 4.

On the other hand, on the front surface of each spoke 4a of the cutter head 4, a rectangular opening 4c is formed at a position where the distance from the center of the cutter head 4 is sequentially changed. Inside the openings 4c, as shown in FIG. 3, there are provided gates 10 which are opened and closed in the longitudinal direction of the spokes 4a by a gate jack 9 and guides for opening and closing the gates 10. The tip of the opening / closing lid 11 contacts the tip of 4d.

The opening / closing lid 11 is pivotally attached by a pin 12 to a bracket 4f projecting from a rear surface plate 4e of the spoke 4a by a pin 12, and by rotating the pin 12 as a center, a cutter accommodating chamber 4g. 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 inside thereof.

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 the output shaft 17 A circular saw cutter 18 having a circular saw shape is detachably attached to one end.

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

To explain the operation, when excavating a tunnel in the ground such as a landfill, first, while the cutter head 4 is rotated by the cutter head motor 3, the shield main body 1 is propelled to the ground by the shield jack 2. Then, the face in front of the cutter head 4 is excavated by the cutter 5. At this time, the openings 4c on the front surface of the spokes 4a are 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 packed drain or a paper drain laid in the underground is hit, the gate 10 is opened by the gate jack 9, and the arm 14 is rotated around the input shaft 16. Then, the round blade cutter 18 rotated by the cutter driving motor 23 is projected from the opening 4c of the spoke 4a. Then, as the cutter head 4 rotates, the drain material, which is an obstacle, is cut ahead of the cutter 5. The cut drain material is taken into the chamber 1a having a closed structure through 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 discharged earth (not shown). It is carried out rearward by the device.

On the other hand, when the round blade cutter 18 collides with an old revetment or rock during the cutting of an obstacle and is damaged, or is worn due to long-term use, the round blade cutter 18 is stored in the cutter accommodating chamber 4g, The gate 10 is closed, and an operator enters through the manhole of the hollow shaft 4h, advances into the spoke 4a, reaches the front of the cutter accommodating chamber 4g, and opens the opening / closing lid 11. Since the spokes 4a have a large cross-sectional area, they can easily move to the cutter accommodating chamber 4g side, and when 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. After exchanging with the cutter 18, the opening / closing lid 11 is closed and the round blade cutter 18 is re-advanced to the cutting face side, whereby the excavation work can be restarted.

[0016]

[Effect of device]

 As described in detail above, this invention is provided in the spoke because the spokes provided on the front surface of the cutter head in the radial direction have a large cross-sectional area so that the operator can easily insert the spoke into the spoke. Even if the round-blade cutter is damaged or worn, the operator can enter the spoke and replace it, eliminating the need for the operator to work in front of the cutter head as in the past. This makes it possible to safely replace the round blade cutter in a short time, and at the same time, it is not necessary to use an auxiliary construction method to prevent the collapse of the face and water outflow, which shortens the construction period and saves costs. You will be able to plan.

[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.

FIG. 3 is an enlarged view of a circle A in FIG.

[Explanation of symbols]

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

 ─────────────────────────────────────────────────── ─── 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, Katano-shi, Osaka Prefecture (72) Inventor Hideki Hagiwara, Shimizuura 1-3-2 Shibaura, Minato-ku, Tokyo (72) Inventor Hiroyuki Kawaguchi 1-2-3 Shibaura Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Hiroshi Tate Inside Shimizu Co., Ltd. 1-32 Shibaura, Minato-ku, Tokyo (72) Creator Sadahiro Taniguchi Inside Shimizu Co., Ltd. 1-3-2 Shibaura, Minato-ku, Tokyo

Claims (2)

[Scope of utility model registration request] 1. A tunnel excavator in which a cutter head 4 rotated by a cutter head motor 3 is provided in front of a shield body 1 propelled into the ground by a shield jack 2, and the cross sectional area of the cutter head 4 is A plurality of large and hollow radiating spokes 4a and a hollow shaft 4h having a large diameter at the center are used to form the spokes 4a and the hollow shaft 4h.
A tunnel excavator characterized in that the hollow spaces of the above are communicated with each other to form an integrated structure. 2. A circular blade cutter 18 in a plurality of spokes 4a.
2. The tunnel excavator according to claim 1, further comprising a sealed accommodation chamber 4g having a port for receiving and exiting.