JPS6011197Y2 - Large solids discharge device for shield excavator - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a coarse solid matter discharge device for a shield excavator, and its purpose is to effectively discharge coarse solid matter that cannot be transported through pipes in a semi-continuous manner.

Conventionally, coarse solid materials such as gravel, cobblestones, and clay lumps in excavated soil are stored in a storage tank installed in a shield machine, discharged using a rotary valve, or processed using a combination of large-diameter pipes and a crusher. Was.

However, it is not always economical, as it takes a long time to drain the water due to clogging of pipes, entanglements in the storage tank, etc.

The present invention has been devised in view of the above, and embodiments thereof will be described below with reference to FIGS. 1 to 4.

1 is a shield body, 2 is a cutter head, and 3 is a partition wall.

A space between the cutter head 2 and the partition wall 3 is a chamber 4 for taking in excavated earth and sand.

This embodiment shows a mud water pressurizing type shield excavator, and the above-mentioned intake chamber 4 is connected to a mud water adjustment tank 5 on the ground.
Mud water is fed under pressure through a mud water pipe 6, and the mud water pressure in the intake chamber 4 can pressurize the face.

The cutter head 2 is rotatably supported by the shield body 1 and has a sand scraping plate 7 on its back.

8 is a motor for driving the cutter head.

A hopper 9 that opens upward is provided inside the earth and sand intake chamber 4 .

This hopper 9 is fixed to the partition wall 3. Behind the partition wall 3 is an earth removal chamber 10 under atmospheric pressure, and a screw conveyor 11 is disposed between this earth removal chamber 10 and the earth and sand intake chamber 4.

The screw conveyor 11 includes a screw shaft 11A and a cylindrical trough IIB, and as is clear from FIG. It will be done.

This portion is then formed as a screen 12.

Therefore, an inflow chamber 13 for muddy water passing through the screen 12 is formed in the lower part of the screen 12.

The inflow chamber 13 is provided with an agitator 14, and is connected to a drainage pipe 16 for transferring earth and mud as slurry to a treatment tank 15 on the ground.

Note that an injection pipe 17 from the mud feeding water pipe 6 is connected to an intermediate portion within the trough IIB.

18 is a closed tank for storing coarse solids.

This is provided integrally with the trough IIB so as to wrap around the rear end opening 11b of the trough IIB.

The closed tank 18 is provided with a coarse solid material discharge port 18A and an opening/closing lid 19 at the bottom thereof.

In addition, the sealed tank 18 is provided with a water filling pipe 20 from the mud feeding water pipe 6, a drain pipe 21 leading to the mud draining water pipe 16, and an air exhaust pipe 22.

23 is a drive motor for the screw conveyor 11, which is fixed to the closed tank 18.

A cone valve 24 is disposed in the closed tank 18 in opposition to the rear end opening 11b of the trough IIB, and is opened and closed by a cylinder device 25.

26 is a coarse solid matter discharge conveyor, and 27 is a waste truck.

In the above process, the earth and sand excavated by the rotation of the cutter head 2 is taken into the intake chamber 4, scraped up by the scraping plate 7, and thrown onto the screen 12 from the hopper 9.

This earth and sand is separated by a screen 12 into coarse solid matter S and earth, sand and mud.

That is, the muddy water passes through the screen 12 and enters the inflow chamber 1.
3, where the slurry is stirred by an agitator 14 and then transferred to a processing tank 15 through a drainage water pipe 16.

On the other hand, the coarse solids S that do not pass through the screen 12 are moved backward in the trough IIB by the rotation of the screw shaft 11A as the drive motor 23 operates.

In this case, a part of the mud water is sent to the trough II by the injection pipe 17.
By spouting it into B, the separation effect on the screen 12 can be improved.

In addition to or apart from this, if the screw conveyor 11 is tilted as shown in FIG. 2 and a certain gap 8 is formed between the screw shaft 11A and the trough IIB, during the transfer of the coarse solids S. It is also possible to classify solid matter with a smaller diameter than the gap 8 and collapsed clay lumps.

When such a classification effect is provided, small-diameter solids fall through the gap 8 onto the screen 12, and those that pass through the screen 12 are sent from the inflow chamber 13 through the drainage pipe 16 to the treatment tank 15.

When operating the screw conveyor 11 for discharging soil, the sealed tank 18 is filled with muddy water and the cone valve 2 is closed.
4 opens the rear end opening 11b of the trough IIB.

Therefore, the coarse solids S sent through the trough 11B are sequentially introduced into the closed tank 18 from the rear end opening 11b.

At this time, muddy water corresponding to the volume of the coarse solids S put into the sealed tank 18 flows out from the sealed tank 18 through the trough IIB into the sediment intake chamber 4, so that the muddy water pressure in the intake chamber 4 changes. It will not cause

The fact that the sealed tank 18 is filled with coarse solids S is detected by a level meter, etc. (not shown), and after the tank 18 is filled, the cone valve 2 is opened.
4 to close the rear end opening 11b of the trough IIB, and the mud water pressure in the earth and sand intake chamber 4 is shut off by the cone valve 24.

In this state, the lid 19 is opened, and the coarse solids S inside the closed tank 18 are taken out from the discharge port 18A onto the conveyor 26 and thrown into the slurry truck 27.

In this case, before taking out the muddy water from the sealed tank 18, the muddy water in the sealed tank 18 is drained from the drain pipe 16 through the drain pipe 21.
Try to pull it out inside.

After taking out the coarse solids S, the discharge port 18A is closed with the lid 19, and the inside of the sealed tank 18 is filled with water through the water filling pipe 20. After filling with muddy water, the rear end opening 11b of the trough IIB is opened with the cone valve 24. let

Then, the coarse solids S are again charged into the closed tank 18.

In the above case, the screw shaft 11A is kept rotating continuously even while the rear end opening 11b of the trough IIB is being closed.

This is possible when the amount of coarse solids S to be discharged is small, but if this is done, there is no need to stop excavation even while the coarse solids are being discharged from the closed tank 18.

Normally, the drive motor 23 of the screw conveyor 11 is configured to automatically stop when overloaded, so if a large amount of coarse solid matter is discharged, the rotation may stop during the above-mentioned continuous rotation.

In that case, excavation will be temporarily stopped.

In this way, the coarse solids S can be discharged intermittently.

Note that if the screen 12 becomes clogged, the screw shaft 11A is rotated in the opposite direction to eliminate the problem.

As is clear from the above explanation, according to the present invention, muddy water is injected from the injection pipe toward the coarse solids that have passed through the screen and been sent into the trough, and the jetted muddy water adheres to the coarse solids. The trough is designed to hit the soil that has been carried by the trough and push it back toward the tip of the trough.

Therefore, separation of earth and sand from coarse solids is promoted.

In addition, when a closed tank is filled with coarse solids, first drain the muddy water inside the closed tank into the drainage pipe through the drain pipe, then open the discharge port of the closed tank to remove only the coarse solids inside the tank. It is possible to discharge
It is possible to separate coarse solids S from earth and sand and muddy water.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the present invention, in which FIG. 1 is a vertical sectional view, FIG. 2 is an explanatory view, and FIG. 3 is an enlarged X-axis view of FIG.
4 is an enlarged Y--Y cross-sectional view of FIG. 1. 1...Shield body, 2...Cutter head, 3...Partition wall, 4...Sediment intake chamber, 6...Sludge feeding Water pipe, 9...hopper, 1
0...Earth removal chamber, 11...Screw conveyor, 11A...Screw IJ-L-shaft, 11
B...Trough, 11b...Trough rear end opening, 12...Screen, 13...
Inflow chamber, 16...Drain water pipe, 18...
Sealed tank, 18A...Large solids discharge port, 1
9... Opening/closing lid, 24... Cone valve.

Claims (1)

[Scope of utility model registration request] A screen is provided at the bottom of the tip of the trough of the soil removal screw conveyor provided between the soil intake chamber and the soil discharge chamber, and an inflow chamber for soil and mud that passes through the screen is formed at the bottom of the screen. At the same time, a drainage pipe is connected to the inflow chamber, and a valve for opening and closing the opening of the trough and a closed tank for storing coarse solids are provided at the rear end of the trough, and a sealed tank for storing coarse solids is provided so as to surround the opening. It is equipped with an on-off valve that forms a possible discharge port, branches from the middle of the mud water pipe that connects the sediment intake chamber and the mud water adjustment tank, connects to a suitable position in the middle of the trough, and opens toward the tip of the trough. An injection pipe is provided, a filling pipe with an on-off valve is provided that branches off from the middle of the mud water pipe and is connected to a sealed tank, and a drain pipe with an on-off valve is provided that connects the sealed tank and the mud drainage pipe. A coarse solid material discharge device for a shield tunneling machine.