JPS6357599B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a closed-type shield excavator that pressurizes the front surface of a cutter to prevent ground collapse.

This type of shield excavator needs to remove earth while maintaining the blockage condition, and conventionally a rotary leaf feeder was installed under the rear end of the screw conveyor to maintain pressure. The feeder is (1) located below the screw conveyor;
(2) Pressurized air or muddy water pressure acts directly, which limits the work space and prevents smooth work when transporting and assembling segments.
There were drawbacks such as the large air blow and the risk of making an explosion noise and scattering the soil during discharge.

Therefore, in recent years, a structure in which rotary leaf feeders are arranged concentrically around the rear end of a screw conveyor has been proposed. This structure is excellent in terms of securing work space, but (1) Since it is concentric with the screw conveyor, the space from the introduction part into the feeder to the discharge part is constant, and the discharge is blocked. (2) Since the outer casing of the screw conveyor also serves as the inner wall of the rotary leaf feeder, it is impossible to drain water inside the feeder. There were other drawbacks.

This invention was made in view of the above points, and by arranging a rotary leaf feeder eccentrically with the annular inner wall around the rear end discharge part of the screw conveyor, the working space below the rear end of the screw conveyor is saved. After securing sufficient soil, it will be possible to smoothly discharge, especially large-diameter gravel, and if a slit is formed in the annular inner wall, this slit will allow water to drain during soil discharge and degassing under reduced pressure. Therefore, the present invention aims to provide a closed-type shield tunneling machine that can reliably prevent the generation of explosive noise.

Embodiments of the present invention will be described below based on the drawings.

Reference numeral 1 denotes a shield frame, and a cutter chamber 2 sealed airtightly or watertightly with a seal 3 is formed on the inside front surface of the frame 1, and a cutter disk 4 is disposed in the cutter chamber 2. Reference numeral 5 denotes a feed pipe with one end opened into the cutter chamber 2, and the feed pipe 5 sends pressurized air or pressurized muddy water into the cutter chamber 2.
The inside of the cutter chamber 2 is pressurized.

Reference numeral 6 denotes a screw conveyor, and the front end of the casing 7 of this screw conveyor 6 is opened in the cutter chamber 2, and the front end of the screw 7' fitted in the casing 7 is exposed from the opening, and the front end of the screw conveyor 6 is opened inside the cutter chamber 2. protrudes to. Further, the casing 7 is inclined upward toward the rear, and has a discharge port 8 at the lower part of the rear end.

9 is a rotary leaf feeder, and 10 is an annular inner wall of the feeder 9. The rotary leaf feeder 9 and the inner wall 10 are arranged eccentrically with respect to the axis of the conveyor 6 around the rear end discharge port 8 of the casing 7 of the screw conveyor. Arrange. Note that although the eccentric direction and eccentric distance are not particularly limited, here, the eccentricity is horizontally eccentric to one side. (See Figure 2) The rotary leaf feeder 9 is equipped with a plurality of partition blades 11 at equal intervals, and the inner end of each partition blade 11 slides and rotates while being connected to the periphery of the annular inner wall 10 to maintain the closed state. It is designed to hold.

Reference numeral 12 denotes an inlet opened in the inner wall 10, which communicates with the outlet 8 of the screw conveyor 6.
13 is a discharge port similarly opened in the inner wall 10, which is located at a symmetrical position with respect to the feeder 9 rotation center of the inlet 12;
That is, it is located at the upper right position in FIG. 2, and the chute 14 is suspended below the discharge port 13.
The lower end of the chute 14 opens onto the front end of the belt conveyor 15.

Further, a slit 16 mainly for draining water is formed between the inlet 12 and the outlet 13 of the inner wall 10, and the water filtered by the slit 16 is drained through a drain pipe 17. There is. 1
8 is a drive machine for the screw conveyor 6, and 19 is a drive machine for the rotary feeder 9, each of which is independent, so that the optimum rotation speed can be set according to the soil discharge situation.

Therefore, in the above-described shield excavator, the earth and sand excavated by the cutter disk 4 in a closed state is conveyed rearward by the screw conveyor 6, passes from the discharge port 8 to the inlet port 12, and enters the rotary leaf feeder 9. The patient was transferred to the hospital while remaining in an occluded state. Next, while the rotary leaf feeder 9 is being rotated, the earth and sand in the rotary feeder 9 is drained through the slit 16 in the inner wall 10, and at the same time, it is depressurized and degassed to release the blocked state. The soil is discharged onto the conveyor 15 and carried out. Note that the passage from the discharge port 13 of the rotary leaf feeder 9 to the chute 14 has a considerably enlarged area compared to the discharge port 13 because the rotary leaf feeder 9 is eccentric to the screw conveyor 6. Since the discharge of earth and sand is smooth and arching does not occur, and the air is removed in advance through the slits 16 in the inner wall, explosion noise and the scattering of earth and sand caused by this are reliably prevented.

In this way, the shield excavator of the present invention has a rotary leaf feeder arranged eccentrically with the annular inner wall around the rear end discharge port of the screw conveyor, and the rotary leaf feeder is used to remove the screw conveyor from the side. Since the soil can be discharged while maintaining the blockage state of the screw conveyor, ample working space is secured compared to the conventional structure in which a rotary leaf feeder is suspended below the rear end of the screw conveyor. In addition, since the discharge port of the rotary leaf feeder can be expanded, the discharge of soil and sand is extremely smooth, especially even large-diameter gravel that is close to the indoor effective diameter of the rotary leaf feeder. By forming slits in the annular inner wall, not only can the drained soil be drained, but air can also be removed from the slits, preventing the generation of explosion noises. This can completely prevent the discarded soil from scattering.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is a longitudinal cross-sectional view, and FIG. 2 is a cross-sectional view taken along the line A--A in FIG. 1. 1... Shield frame, 2... Cutter room,
3...Seal, 4...Cutter disk, 5...
Feed pipe, 6...Screw conveyor, 7...Casing, 7'...Screw, 8...Discharge port, 9
... Rotary feeder, 10 ... Annular inner wall,
11... Partition blade, 12... Inlet, 13... Outlet, 14... Chute, 15... Belt conveyor, 16... Slit, 17... Drain pipe, 18,
19...Driver.

Claims (1)

[Scope of Claims] 1. In a shield excavator with a closed structure in which earth and sand excavated by a cutter mechanism installed at the tip of the shield frame is conveyed rearward by a screw conveyor, a rear end discharge of the screw conveyor is provided. A rotary leaf feeder having partition blades protruding inwardly eccentrically from the outlet is arranged around the outlet, and an annular inner wall to which the inner ends of the partition blades are slidably joined is arranged inside the feeder. A shield excavator characterized by: 2. The shield excavator according to claim 1, wherein a slit is formed at a suitable location between the feeder inlet and the outlet in the annular inner wall.