JPS5918516B2 - shield tunneling machine - Google Patents

Description

[Detailed description of the invention] The present invention relates to a shield tunneling machine.

When excavating ground with highly fluid soil using a mechanical excavation shield, a method is known in which the cutter head is filled with excavated soil and the excavation is carried out while preventing the face from collapsing due to the pressure of the excavated soil.

In this case, it is desirable for the excavated earth and sand discharge means to be provided at the bottom of the shield, avoiding the top of the shield where collapse is most likely to occur, in order to stabilize the face.

However, although providing a means for discharging excavated soil at the bottom of the shield has the above-mentioned advantages, if the excavated ground is compacted, the excavated soil shoved into the cutter head may stick and reach the entrance of the soil discharge device. Since it does not move, it has the disadvantage that it cannot be discharged.

Figure 1 shows a shield excavator with a discharge device for excavated earth and sand placed at the bottom of the shield.

In FIG. 1, 1 is a cutter head, 2 is a center shaft, 3 is a shield body, 4 is a bearing, 5 is a drive gear, 6a is a pinion, 6 is a drive motor, and 7 is an excavated soil discharge device.

In this arrangement, the cutter head 1 is driven by the central shaft 2 supported by a bearing 4, so that the transmitted torque and cutter head 1
The load acting on the shield machine is limited, and since the gear 5 is placed in the center of the shield machine, the space inside the machine is narrow, and the arrangement of the ejection device 7 is also restricted.

The present invention has been made in view of the above circumstances, and its purpose is to prevent the top face of the shield from collapsing while excavating highly fluid soil, as well as to excavate solid ground. The objective is to provide a shield excavator that can also excavate large amounts of water, while also increasing the space inside the machine.

Hereinafter, the present invention will be explained with reference to FIG. 2 and subsequent figures.

In the figure, reference numeral 8 denotes a shield body, and a ring-shaped cutter head support 9, which is a cutter head support structure B, is fixedly installed on the inner circumference of this shield body 8.

A support portion 15 is formed on the inner peripheral portion of the cutter head support 9.

10 in the drawing is a cutter head, and this cutter head 1
0 has a plurality of earth and sand intake ports 11 provided radially, and a plurality of cutters 12 are attached to the side edges of the earth and sand intake ports 11.

A plurality of support legs 13 are fixed to the inner circumferential surface of the cutter head 10, and ring-shaped receiving members 14 are fixed to the ends of these support legs 13.

A ring-shaped receiving member 14 of the cutter head 10 is rotatably supported on the support portion 15 of the cutter head support 9 via inner and outer seals 16a and 16b, respectively, which are a sealing mechanism C.

Further, the inner ring side 17a of the main bearing body 17 is fixed to the cutter head support 9, and the outer ring side 17a of the main bearing body 1T is fixed to the cutter head support 9.
7b is fixed to the ring-shaped receiving member 14, and a gear 18 is formed on the outer ring side 17b.

A drive motor 19 is fixed to the cutter head support 9, and a pinion 20 of the drive motor 19 is connected to the gear 1.
It meshes with 8.

A partition 21 having an opening 27 serving as a manhole for inspecting the inside of the cutter head is provided in the center of the cutter head support 9, and a lid 40 is attached to the partition 21 with bolts so as to close the opening 27. It is.

In the drawing, reference numeral 22 denotes a screw conveyor which is an excavated earth and sand discharge device, and the casing 41 of this excavated earth and sand discharge device is divided into the casing 23 and a rear casing 25, and the front and rear casings 23 and 25 are connected to each other by a flange 24. It is.

Furthermore, seven mounting flange 26 are fixedly installed on the casing 41.

A charging port 42 is provided at the lower part of the cutter head support 9, and the entrance side of an excavated soil discharge device is inserted into this charging port 42, and the excavated soil discharge device is attached to and detached from the support member 43. Possibly supported.

A plurality of protruding members 28 are provided on the back surface of the cutter head 10.
are fixedly installed, and the protruding member 28 and the support leg 1
An earth and sand scooping member 29 is attached to the third and third parts with bolts.

Further, a cylindrical bracket 30, which is a support member E, is attached to the cutter head support 9 with bolts, and this cylindrical bracket 30 is connected to a mounting flange 26 of an excavation earth and sand discharge device with bolts. It's Nishide.

Next, the operation will be explained.

When excavating ground with highly fluid soil, as shown in FIG. Remove the top plate 29.

When the drive motor 19 is rotated in this state, the pinion 2
0. The outer ring side 17b of the main bearing body 17 rotates via the gear 18, and the cutter head 10 rotates via the support legs 13.

As the cutter head 10 rotates, the earth and sand excavated by the cutter 12 is taken in through the earth and sand intake port 11 into the intake chamber A formed by the cutter head 10 and the cutter head support structure B.

The entrance side of the excavated earth and sand discharge device is opened at the lower part of this intake chamber A, and the excavated earth and sand is discharged to the rear of the shield excavator by the excavated earth and sand discharge device.

Therefore, when excavating highly fluid soil, filling the intake chamber A with excavated soil allows excavation to be carried out while preventing the face at the top of the shield from collapsing.

In addition, when excavating fixed ground, the lid 40 is removed and the opening 27 is opened, as shown in FIG.
1, insert the inlet side of the excavated soil discharge device into the intake chamber A, and attach the cylindrical bracket 3 to the cutter head support 9.
0 is fixed, and this cylindrical bracket 30 receives the mounting 7 flange 26 to support the excavation earth and sand discharge device. Also, between the projecting member 28 of the cutter head 10 and the support leg 13, a soil scraping member 29 is provided. Attach with bolts.

Further, the charging port 42 is closed with a lid body 44.

In this state, the cutter head 10 is rotated to excavate the earth and sand.

The excavated earth and sand is taken into the intake port A from the earth and sand intake port 11, and as the cutter head 10 rotates, it is scraped up by the scraping member 29 and conveyed to the upper part of the intake chamber A, where it falls by gravity and becomes excavated earth and sand. It is taken into the tip opening 22a of the discharge device and discharged backward.

This makes it possible to excavate the ground that has been fixed.

As described in detail above, the present invention provides a cutter head 10 that is rotatably provided on the cutter head support structure B of the shield body 8 and rotated by a rotational drive means, and a gap between the cutter head support structure B and the cutter head 10. an intake chamber A that is provided at A charging port 42 is provided at the lower part of the chamber A, into which the inlet side of the excavated soil discharge device is removably inserted, and a charging port 42 is provided at the rear center of the intake chamber A, into which the inlet side of the excavated soil discharge device is inserted. and an opening 27 that is closed by a lid when charging into the charging port 42 of the excavated earth and sand discharge device.

A scraping member 2 that is detachably attached to the cutter head 10 and scrapes upward the excavated soil taken into the intake chamber A.
9.

Therefore, the inlet side of the excavated soil discharge device is charged into the charging port 42, and the inlet side of the excavated soil discharge device is inserted into the intake chamber A.
By positioning it at the bottom of the shield, it is possible to fill the intake chamber A with excavated soil and prevent the top face of the shield from collapsing while excavating highly fluid soil. By inserting the entrance side of the excavated soil discharge device into this opening 27 and attaching the scraping member 29 to the cutter head 10, the excavated soil taken into the intake chamber A is scraped up by the scraping member 29. It can be carried into the entrance side of the excavation soil discharge device and discharged backward, making it particularly suitable for excavating compacted ground.

Furthermore, if the inlet side of the excavated earth and sand discharge device is located at the lower part of the intake chamber A, the internal space becomes larger, which is advantageous for excavation work.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of a conventional shield tunneling machine, Fig. 2 is a longitudinal sectional view of an embodiment of the present invention, Fig. 3 is a view taken from the direction of Fig. 2, and Fig. 4 is a longitudinal sectional view of an embodiment of the present invention. Fig. 5 is a perspective view of the cutter head, and Fig. 6 is an explanatory diagram of the configuration of the shield excavator according to the present invention when excavating solidified ground. 10 is a cutter head, 21 is an opening, 42 is a charging port, A
1 is an intake chamber, D is an excavated earth and sand discharge device, and 29 is a raking member.

Claims (1)

[Scope of Claims] 1. A shield main body 80, a cutter head 10 rotatably provided on the cutter head support structure B and rotated by a rotational drive means, and a cutter head 10 provided between the cutter head support structure B and the cutter head 10. An intake chamber A into which excavated earth and sand excavated by the cutter of the cutter head 10 is taken in, and an intake chamber A
The excavated soil discharge device rito discharges the excavated soil taken in to the rear. A charging port 42 provided at the lower part of the intake chamber A and into which the entrance side of the excavated earth and sand discharge device is removably charged, and the intake chamber A.
The cutter head 10 has an opening 27 provided at the center of the rear part thereof, into which the entrance side of the excavated soil discharge device is inserted, and which is closed by a lid when charging into the charging port 42 of the excavated soil discharge device; A shield excavator characterized in that it is equipped with a scraping member 29 that is attached to a scraper member 29 and scrapes up excavated earth and sand taken into the intake chamber A.