JPS6043518B2 - Sediment separation and lifting method - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method for separating earth and sand.

For example, in the shield method, excavated earth and sand discharged from a shield excavator is transported and lifted by a slider.

However, the excavated soil contains water and a paste-like plastic fluidization improver (hereinafter referred to as slurry).
If the excavated soil is dumped in this state, the slurry will also be dumped, resulting in waste, and if the excavated soil is transported while still containing moisture, the transportation efficiency will be low and it will be uneconomical. Therefore, the present invention provides a method for separating and lifting earth and sand that eliminates the above-mentioned drawbacks.

That is, the present invention includes a cylindrical casing that is rotatably supported on a support base, a rotatable central shaft that is disposed within the casing concentrically with the casing, and a central shaft that is inserted into the casing and that is rotatable. A separator lifting device has a ribbon-shaped screw that is rotatably fitted onto the outside of the casing, and a rotary drive device that separately rotates the ribbon-shaped screw, a central shaft, and a cylindrical casing. After positioning the ribbon-shaped screw, the central shaft, and the cylindrical casing in arbitrary directions, the inside of the cylindrical casing is placed inside the earth and sand lifted by the ribbon-shaped screw, and the central shaft is placed inside the cylindrical casing. Liquid is injected from a plurality of nozzles, and the fine soil and liquid are separated and dropped downward through the gap between the ribbon-shaped screw and the central shaft and the gap between the ribbon-shaped screw and the cylindrical casing, and the remaining part is excavated. ±This is a soil separation method characterized by lifting the sand.

Hereinafter, one embodiment of the present invention will be described based on FIGS. 1 to 4.

1 is a shield excavator that is excavating a tunnel; 2 is an earth removal device that conveys excavated soil taken into the pressure chamber 3 of the shield excavator 1 to an atmospheric pressure chamber 4; and 5 is an earth removal device that is discharged from the earth removal device 2. This is a conveyor for loading excavated soil onto the Zuritoro 6.

Then, the excavated earth and sand is thrown into a bit 8 formed at the bottom of the shaft 7 by the slider 6. An earth and sand separation and lifting device 9 is disposed within the vertical pile 7, and excavated earth and sand containing liquid (water, slurry, etc.) in the bit 8 is lifted to the ground. When the soil is lifted, the liquid and fine soil contained in the excavated soil are separated and dropped. The soil separation and lifting device 9 will be explained in detail below.

10 is a cylindrical casing rotatably supported via a bearing 12 on a support stand 11 provided on the ground, and the upper end is supported by the bearing 1.
2, and a first large gear 13 is attached thereto, and the first large gear 13 is operatively connected to a first rotational drive device 15 via a pinion 14.

The first rotary drive device 15 includes a fixed casing 1 which will be described later.
It is supported by 7. The lower portion of the cylindrical casing 10 is supported by the inner wall of the vertical pile 7 via a bearing 16, and its lower end is located within the bit 8. The cylindrical casing 10 is supported in an appropriate and optimal manner depending on the length and inclination of the cylindrical casing 10. 1
A fixed casing 7 is supported on the ground via a support stand 18, and its lower end is fitted onto the cylindrical casing 10 via a bearing 19.

In addition, 20 is a cylindrical casing 10 and a fixed casing 17.
This is a sealing material interposed between the Reference numeral 21 denotes a ribbon-shaped screw disposed over the entire length inside the cylindrical casing 10, and a rotating cylinder 22 is attached to the upper end of the ribbon-shaped screw.

The ribbon-shaped screw 21 is rotatably supported by the fixed casing 17 via the rotary cylinder 22 and is rotationally driven. That is, the upper part of the rotating cylinder 22 is inserted through the center of the support plate 23 fixed in the fixed casing 17, and the second large gear 24 is attached to the outer periphery of the upper end.
The large gear 24 is supported by a support plate 23 via a bearing 25 and is connected to a second rotary drive device 27 via a pinion 26.
is linked to. Reference numeral 28 denotes a central shaft inserted inside and over the entire length of the ribbon-shaped screw 21, the upper end of which passes through the rotating cylinder 22 and is located above, and a third large gear 29 is attached to the upper end. It is being

The center shaft 28 is rotatably supported on the second large gear 24 via a bearing 30 provided under the third large gear 29, and a pinion meshed with the third large gear 29. It is operatively connected to a third rotary drive device 32 via 31 . Further, a hole 33 opening at the upper end in the axial direction is bored in the central shaft 28 with an appropriate length, and nozzles 34 communicating with the hole 33 are installed at a plurality of suitable locations in the vertical direction of the central shaft 28 in the circumferential direction. A plurality of openings are opened on the outer surface in each direction. 35 is a rotary joint 36 at the upper end of the hole 33.
A hose connected through the hole 33 of the central shaft 28
The purpose is to supply water to the

Note that the second and third rotation drive devices 27 and 32 are supported by the upper end of the fixed casing 17. A gap a is provided between the inner surface of the cylindrical casing 10 and the outer surface of the ribbon-shaped screw 21, and a gap b is provided between the inner surface of the ribbon-shaped screw 21 and the outer surface of the central shaft 28. . Each of the gaps A and b is sized to allow passage of the liquid in the excavated soil and fine-grained soil. 37
is on the side wall of the fixed casing 17 and on the cylindrical casing 10
A discharge chute provided between the upper end and the support plate 23,
This is for guiding the excavated earth and sand lifted up by the ribbon-shaped screw 21 into the hopper 38.

Reference numeral 39 denotes a tank installed on the ground, in which the liquid and fine earth and sand in the bit 8 are recovered via a pump 40 and piping 41, and the liquid is adjusted so as to be reused as slurry.

That is, a thickener, bentonite, etc. are added to the recovered liquid, and clay lumps and coarse particles in the fine earth and sand are removed. 42 is a slurry injection pipe whose one end is connected to the tank 39 and the other end is connected to the pressure chamber 3 of the shield tunneling machine 1, and 43 is a pump provided midway through the slurry injection pipe 42.

Next, a method for separating and lifting earth and sand will be explained.

The excavated earth and sand taken into the pressure chamber 3 is mixed with slurry, and then conveyed to the bit 8 at the bottom of the vertical pile 7 by the earth removing device 2, the conveyor 5, and the slippery 6 and gated. The excavated earth and sand put into the bit 8 is lifted up by a ribbon-shaped screw 21. At this time, the excavated earth and sand lifted inside the cylindrical casing 10 by the ribbon-shaped screw 21,
Water is injected from a nozzle 34 provided on the central shaft 28)
As a result, fine-grained soil in the excavated soil is washed downward. The fine earth and sand and the liquid (sludge and water) in the excavated earth separate and fall into the bit 8 from the gaps A and b. Then, only the remaining excavated soil with relatively large particle size and low moisture content is separated and lifted. By the way, as shown by the arrows in FIG. 4, the cylindrical casing 10, the ribbon-shaped screw 21, and the central shaft 28 are arranged so that the rotation directions and rotation speeds thereof are alternately different, so that excavated earth and sand will not adhere to them. There is.
Incidentally, the fine-grained earth and sand and liquid that have separated and fallen onto the bit 8 are transferred to an above-ground tank 39 by a pump 40 and reused as slurry. In the above-mentioned embodiment, an explanation has been given of the case in which a slider is used to convey the excavated earth and sand into the bit, but a pumping tube 44 may be used, for example, as shown in FIG. 5. Further, in the above embodiments, a shield tunneling machine has been described, but it can also be used, for example, when lifting excavated earth from a place where there is groundwater, or when unloading damp bulk cargo from a ship. As described above, according to the earth and sand separation and lifting method of the present invention, excavated earth and sand are lifted up using a ribbon-shaped screw, and water is injected onto the excavated earth and sand from the nozzle on the central axis, so that, for example, The liquid containing slurry and fine-grained soil can be separated and dropped downward, and only the remaining soil with a low moisture content can be lifted up, increasing the transport efficiency. The slurry can be reused.

[Brief explanation of drawings]

Fig. 1 is an overall longitudinal sectional view of an embodiment of the present invention, Fig. 2 is an enlarged sectional view of the main part, Fig. 3 is an enlarged view of part I in Fig. 2, and Fig. 4 is an enlarged view of part I in Fig. 2. The arrow view and FIG. 5 are longitudinal sectional views of a shield tunneling machine in another embodiment. 9... Earth separation device, 10... Cylindrical casing, 11... Support stand, 15... First rotary drive device, 21... ...Ribbon-shaped screw, 24...Second large gear, 27...
Second rotary drive device, 28... center, 32...
...Third rotary drive device, 33 ... Hole, 34
······nozzle.

Claims (1)

[Claims] 1. A cylindrical casing rotatably supported on a support base,
A rotatable central shaft disposed within the casing and concentric with the casing, a ribbon-shaped screw inserted into the casing and rotatably fitted onto the central shaft, and these ribbon-shaped screws and the central shaft. After positioning the tip of the separating soil lifting device having a rotary drive device that separately rotates the cylindrical casing and the cylindrical casing within the soil to be lifted, the ribbon-shaped screw, the center shaft, and the cylindrical casing are moved in arbitrary directions. The cylindrical casing is rotated, and liquid is injected from a plurality of nozzles drilled in the central shaft into the earth and sand lifted up by the ribbon-shaped screw in the cylindrical casing, and the fine-grained earth and the liquid are transferred to the ribbon-shaped screw. A method for separating and lifting earth and sand, characterized in that the remaining excavated earth is lifted up by separating and dropping the earth and sand downward from a gap between a ribbon-shaped screw and a central shaft and a gap between a ribbon-shaped screw and a cylindrical casing.