JPS6040711Y2 - Earth removal device for shield excavator - Google Patents

Description

[Detailed description of the invention] The present invention relates to an earth removal device for a shield excavator, and its purpose is to remove coarse solids (such as clay lumps and cobblestones) from earth excavation. The purpose of this method is to discharge coarse solid matter, especially cobblestones, etc. very naturally.

Conventional shield tunneling machines use a screw conveyor as their continuous soil removal device.

Screw conveyors employed for the purpose of continuous earth removal are equipped with an outer blade screw, that is, a helical blade around a rotating shaft, inside a cylindrical casing.

The particle size of the coarse solids that can be discharged in this type of earth removal device is limited to approximately 1n of the outer diameter of the helical blade due to the space occupied by the rotating shaft (shaft cross-sectional area).

Therefore, it is difficult to discharge larger particles such as boulders.

As a solution to this drawback, a so-called ribbon screw shown in FIG. 1 has been proposed.

That is, in the ribbon screw 1, a ribbon 2 in the form of a spiral band is used, and the ribbon 2 is housed in a cylindrical drum 3 over its entire length, and its tip is connected to the excavated earth and sand intake chamber of the shield excavator. (Face pressure chamber: Pressure chamber)
It extends to the rear of the chute 5 provided in the chute 4.

In such a device, depending on the height of the ribbon 2, the size of the coarse solid matter S such as boulders that can be accommodated in the drum 3 can be adjusted to a considerable extent, and as a result, the drum 3
It has the advantage of being able to reduce the outer diameter of the.

However, the dirt and sand are not taken in well at the dirt and sand intake port 6 of the ribbon screw 1.

For this reason, the fluid (muddy water, etc.) F is flowed out toward the earth and sand intake port 6, and taken in by the flow velocity.

Therefore, a fluid pump P is required.

Note that 7 is a soil container.

This invention involves taking in soil and sand into the ribbon screw.
We are proposing something that does not require extra operations or equipment, and examples thereof will be described below with reference to FIGS. 2 and 3.

10 is a shield body, 11 is a cutter head, and 12 is an enclosure, and the enclosure 12 is integrated with the cutter head 11 to form an excavated soil intake chamber 13 therein, and a drive source 14.
is linked to.

The cutter head 11 is rotatably supported by the shield body 10 via an enclosure 12, a bearing 15, and the like.

The excavated soil intake chamber 13 is opposed to the face during earth excavation, and has a hopper 16 with an open top inside.
will be provided.

17 is a ribbon screw.

The ribbon screw 17 connects the cylindrical drum 18 and this drum 1.
8 and a spiral band-like body 19 (hereinafter referred to as ribbon) which is internally arranged in the shape of internal teeth.

Reference numeral 20 denotes an enclosure casing, which is connected to the rear of the hopper 16, and has a rotary valve 21 at the lower part of the rear end.
will be provided.

The drum 18 of the ribbon screw 17 is rotatably supported by the surrounding casing 20 via a bearing 22, a seal 23, etc.

The tip of the ribbon 19 of the ribbon screw 17 extends into the hopper 16 .

This extended portion 19A is made of a material having greater strength and rigidity than the adhesive ribbon 19 within the drum 18.

A screen (grid, net, etc.) 24 is provided along the outer periphery of the lower half of this extended portion 19A, and this screen 24
As a result, a receiving chamber 25 for receiving small particle size solids is formed at the inner bottom of the hopper 16 .

This receiving chamber 25 is connected to a motor 26 .

An agitator 27 is provided, and the base of a mud drain pipe 28 is connected near the agitator 27.

Note that 29 is a mud water pipe connected to the excavated soil intake chamber 13;
30 is a gate device for opening and closing the hopper opening, 31
is a rotary drive device operatively connected to the drum 18 via a gear mechanism 32, which is fixed to the positioning casing 20.

32 is an earth and sand conveyor.

In the above, the excavated soil taken into the excavated soil intake chamber 13 enters the hopper 16, and then is transferred on the screen 24 by the ribbon extending portion 19A of the ribbon screw 17, which is rotated by the rotation drive device 31. It is then sent into the drum 18, and further into the rotary valve 21 from the rear end, and then discharged onto the conveyor 32 by the actuation of the valve 21.

At this time, on the screen 24, only the fine particle size solids flow into the receiving chamber 25 through the screen 24, and after being stirred by the agitator 27, are sent in the form of a slurry through the drainage pipe 28.

FIG. 3 shows a system in which a pressure tank 33 such as a container is connected to the enclosure casing 20 to collect coarse solid matter S such as gravel and boulders.

Incidentally, if the particle size of the coarse solids that can be transferred by the ribbon screw 17 is d1, and the inner diameter of the drum 18 is D1 and the height of the ribbon 19 is h, then d=D-h.

In this case, in the conventionally used outer blade screw, if the rotating shaft diameter is S1 and the spiral blade diameter is as follows, d=(D-5)×2.

As is clear from the above explanation, according to the present invention, the tip of the spiral strip built in the cylindrical drum extends into the hopper in the excavated soil intake chamber, so that the screw of the extended portion The action allows the excavated earth and sand to be mechanically transported into the drum, thereby eliminating the need for special operating equipment.

In addition, as in the embodiment described with reference to FIG. 2, by providing a screen along the ribbon extension, this screen not only functions as a fine grain preliminaries, but also as a clay crusher and a clay transporter. It also works effectively for this purpose.

In the illustrated example, a muddy water type shield tunneling machine has been described, but the present invention can be applied to other systems.

For example, it is effective when removing plasticized earth and sand.
In this case, the mud water pipe shown in FIG. 2 is not required.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view of a conventional example, FIG. 2 is a sectional view of an embodiment of the present invention, and FIG. 3 is a partial sectional view of a modified example. 10... Shield body, 13... Excavation earth and sand intake chamber, 16... Hopper, 17...
・Ribbon screw, 18... Cylindrical drum, 1
9... Spiral strip (ribbon), 19A...
...Ribbon extension part, 31...Rotation drive device.

Claims (1)

[Scope of utility model registration request] A hopper with an open top is provided inside the excavated soil intake chamber facing the face, and a cylindrical drum with a spiral band inside is rotatably connected to the rear of this hopper, and the tip of the spiral band is connected to the top of the hopper. An earth removal device for a shield excavator, characterized in that the earth removal device extends into a hodopa, and the cylindrical drum is interlocked and connected to a rotational drive device.