JPS6136631Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an earth removal device for a shield excavator.

Conventionally, a screw conveyor type has been used as an earth removal device for a shield excavator. According to this screw conveyor type, as shown in FIG. As shown in A of the figure,
There was a drawback that the earth and sand adhered to and grew on the screw blades 2 and the rotating shaft 1, and rotated together with the screw blades 2, making it difficult to discharge the earth and sand.

Therefore, the present invention provides an earth removal device for a shield excavator that can eliminate the above-mentioned drawbacks.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. 11 is a shield main body, 12 is a cutter head provided at the front of the shield main body 11 and made rotatable by a rotation drive device 13;
14 is a pressure chamber formed within the cutter head 12;
Reference numeral 15 denotes an earth removal device for discharging excavated earth and sand taken into the pressure chamber 14 to the atmospheric pressure chamber 16 side. The earth removal device 16 has screw blades of a screw conveyor type earth removal device formed into a coil shape, and the stirring shaft of the stirring blade provided in the pressure chamber is separate from the coiled screw blade (also referred to as a ribbon screw). It is provided inside the coiled screw blade and at the rotational axis of the coiled screw blade. To explain in detail below, reference numeral 17 denotes a discharge port 1 whose front end opens into the pressure chamber 14 and whose rear end opens into the atmospheric pressure chamber 16.
This is a cylindrical casing having a diameter of 8, and a coiled screw blade 19 is disposed over substantially the entire length inside the casing. The coiled screw blade 19 is rotationally driven via a rotating ring 20 fixed to the outer periphery of its rear end. That is, external teeth 21 are provided on the outer periphery of the rotating ring 20, and the external teeth 21 are interlocked and connected to a rotational drive device 23 via a pinion 22. In addition,
24 is a bearing of the rotating ring 20, and 25 is a sealing material arranged on both sides of the bearing 24. Further, 26 has a stirring blade 27 at its tip for stirring the inside of the pressure chamber 14, and is separate from the coiled screw blade 19 and inside the coiled screw blade 19.
The stirring shaft is provided at the rotational axis of the shaft, and its tip is rotatably supported by a bracket 28 projecting into the pressure chamber 14, and its rear end projects outside the cylindrical casing 17 via a sheath tube 29. bearing 30
It is rotatably supported by and operatively connected to a rotational drive device 33 via a large gear 31 and a pinion 32. Note that 34 is an injection pipe for plastic fluidizing material (for example, slurry) connected to the rear end of the stirring shaft 26 via a rotary joint 35;
This is for injecting slurry into the pressure chamber 14 through the inside of the stirring shaft 26. Therefore, the stirring shaft 26
is hollow and its front end is opened into the pressure chamber 14. 36 is a gate that opens and closes the discharge port 18 of the cylindrical casing 17; 37 is the gate 3;
This is a cylinder device that operates 6.

According to the above configuration, the excavated soil taken into the pressure chamber 14 is mixed and stirred with a plastic fluidized material (for example, slurry) by the stirring blade 27, and then is moved to the cylindrical casing 17 by the coiled screw blade 19. The excavated soil is sent to the rear space 38, where a sand plug capable of resisting groundwater pressure and collapsed soil pressure is formed, and the gate 36 of the discharge port 18 is opened to discharge the excavated soil onto a discharge conveyor (not shown). Ru. By the way, since the coiled screw blade 19 and the stirring shaft 26 can be rotated separately, if their rotational speeds and rotation directions are made different so that they have relative speeds to each other, they can be rotated independently of the conventional screw blade and stirring shaft 26. Unlike those with an integrated shaft,
It is possible to prevent excavated soil from adhering to the surrounding area. Further, when the rotational speed or rotation direction of the stirring blade 27 at the tip of the stirring shaft 26 and the coiled screw blade 19 are different, the effect of stirring the excavated earth and sand in the pressure chamber 14 is improved. Further, when the stirring shaft 26 is stopped, the excavated earth and sand are easily discharged due to the coefficient of friction between the inner surface of the cylindrical casing 17 and the outer surface of the stirring shaft 26. Particularly, when the coiled screw blade 19 and the stirring shaft 26 rotate in opposite directions, it is more effective to discharge the excavated earth and sand. In addition, this soil removal device can also be applied to sticky agitation transfer other than shield tunneling machines.
It can also be applied to vertical transport.

As described above, according to the earth removal device for a shield excavator of the present invention, the screw blades of the screw conveyor type earth removal device are formed into a coil shape, and the stirring shaft is installed separately from the coiled screw blade inside the screw conveyor type earth removal device. Moreover, since it is provided at the center of the rotation axis of the coiled screw blade, the rotational speed and rotation direction of the coiled screw blade and the stirring shaft can be made different.
Therefore, unlike a case in which the screw blade and the stirring shaft are integrated, for example, it is possible to prevent the excavated earth and sand from adhering to the coiled screw blade and the stirring shaft, thereby improving the discharge efficiency of the excavated earth and sand.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the - arrow in FIG. 1, and FIG. 3 is a longitudinal sectional view of a main part of a conventional example. 11...Shield body, 14...Pressure chamber, 15
... Earth removal device, 16 ... Atmospheric pressure chamber, 17 ... Cylindrical casing, 19 ... Coil screw blade, 2
3... Rotation drive device (coiled screw blade), 26... Stirring shaft, 27... Stirring blade, 33
...Rotary drive device.

Claims (1)

[Scope of utility model registration request] The screw blades of a screw conveyor-type soil removal device for discharging excavated soil from the pressure chamber of the shield excavator to the atmospheric pressure chamber are formed into a coil shape, and the screw blades are inserted into the cylindrical casing of the soil removal device and are inserted into the pressure chamber. A stirring shaft with a stirring blade at the tip that stirs the
An earth removal device for a shield excavator, characterized in that it is provided separately from and inside the coiled screw blade and at the rotational axis of the coiled screw blade.