JPS606439B2 - Earth removal device for shield excavator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a simulator for a shield tunneling machine.

When performing underground excavation, etc., the quality conditions of the excavated ground are as follows:
In cases where water permeability is high and the groundwater level is high, such as in the sandy rock layer, the excavated ground is likely to be contaminated, and it is often difficult to perform auxiliary excavation.

The present invention enables excavation without the need for auxiliary construction methods even under the above soil conditions, and examples thereof will be described below with reference to FIGS. 1 to 5.

1' is a shield, 2 is a cutter head, 3 is a power cutter head drive device, and 4 is a bulkhead.The front part of this bulkhead 4 is a face pressurizing chamber 5, and the rear part is a discharge chamber 6 under atmospheric pressure. Ru.

A displacement device consisting of a screw conveyor 7 has a face pressure chamber 5.
and the ejector room 6. The casing 8 of the screw conveyor 7 is provided with an excavated soil receiving port 9 at the end of the face pressurizing chamber, and a scarlet port 10 at the end of the pseudo chamber. A cone valve 11 is provided opposite to the artificial earth opening 101. That is, the cone valve 11' is biased in the direction of closing the soil discharge port 10 by a cylinder device or the like (not shown), and due to the biasing force and the soil transfer pressure by the screw conveyor 7, the screw comparator casing near the soil discharge port 10 is The earth and sand compaction part P is formed inside 8, so that the face holding pressure in the face pressure chamber 5 is maintained at the same level as the displacement chamber 6 even in the middle of the day.
Prevent it from being released to the side. Incidentally, the mottling from Hi±Row 0 is carried out against the biasing force of the cone valve 11 while maintaining this pressure. A pair of partition plates 13 are provided at two places in the upper middle part of the earth and sand transfer path 12 inside the screw compare casing 8 in the earth and sand transfer direction, spaced apart from each other.
A and 13B are provided. These partition plates 13A, 13B
can be inserted into and removed from a cutout hole formed in the screw compare casing 8, and when removed, the cutout hole is closed by an appropriate means. Also, the partition plates 13A, 1
The screw blade 14 is cut out at two places corresponding to the insertion position of the screw blade 3B, so that the screw blade 14 is allowed to rotate even when the partition plates 13A and 13B are inserted. . 14A and 148 indicate notches.

Reference numeral 15 indicates an injection material injection pipe leading to the face pressure chamber 5, and reference numeral 16 indicates an injection material leading to the inside of the screw compare casing 8 between the partition plates 13A and 13B, that is, a plasticity improving material required for excavated soil and a scale water permeability material. The improvement material injection pipe 17 is a drive device for the screw conveyor rotating shaft 18.

In the above process, the cutter head 2 is rotated to excavate the ground, and the excavated earth and sand are taken into the face pressure chamber 5, and the injection material m is added and injected into the excavated earth and sand through the injection pipe 15.

In this way, the earth and sand mixed with the injection material m in the face pressurizing chamber 5 is transferred through the earth and sand transfer path 2 inside the casing 8 by the operation of the screw conveyor 7, and
It is compacted in the vicinity of the cone valve by the action of the cone valve turtle blade, and is released and discharged from the Enoki Eshiro 0 to the Enoki E earthen chamber 6 while maintaining the pressure in the face pressurizing chamber 6 at any time. The degree of waterproofness of soil compacted in this way is determined by its compacted area P.
The length can be adjusted to some extent by increasing or decreasing the length by appropriate means. However, if the earth has extremely high water permeability and the proportion of fine particles in the earth and sand is small, such as when the earth is a sandy rock layer, such earth and sand is difficult to be plasticized. Therefore, even if the injection material m is added and injected into the face pressurizing chamber 5, the flow condition is insufficient. As shown in FIG. The transport is carried out in a state where the earth and sand are piled up [accumulation part ○], and the upper part becomes a space or has a coarse density. If such a situation occurs, the injection material M is injected through the injection pipe 16 between the pair of partition plates 13A and 13B. The injection material M thus injected is prevented from flowing out along the upper part of the earth and sand by the partition plates 13A and 13B.
Therefore, it is efficiently mixed into the earth and sand passing through the lower part of the space S between the partition plates 13A and 13. That is, while the screw conveyor 7 is in operation, the lower part of the space S between the pair of partition plates 13A and 13B is the mixing area Z of earth and sand and the injection material M, the area in front of it is the earth and sand transport area Z2, and the area behind it is the area where the sand is mixed. This is the cotton hardening area Z. In this way, the injection material M is mixed, and the earth and sand are compacted well in the vicinity of the artificial entrance 10, and a high water-stopping property is exhibited. Furthermore, the fifth
The figure shows a modification of, for example, the rear part of the pair of partition plates 3A and 3B.

That is, what is shown in the figure is ``In order to completely close the earth and sand transfer path 2 in the screw compare casing 8, partition plates 19 are placed facing each other from the top and bottom of this casing.
A. Wing 98 inserted. If you do it like this~
It is possible to make the mixing state of the earth and sand and the injection material M in the mixing area Z more uniform while preventing groundwater leakage, and it is possible to ensure a higher level of water-stopping performance. "The partition plates 13A and i3B are provided at two locations in the sand transfer direction 12 in the sand transfer direction, and the injection pipe turtle 6 is conveyed between them. However, the present invention is not limited to this. It is also possible to provide partition plates at each location and allow the injection tubes to move between them.As is clear from the above explanation, according to the present invention, the injection material does not flow out wastefully It can be effectively added to soil.

As a result, it can perform well even in soil conditions with low water-stopping properties, such as sandy rock formations, leading to expanded soil adaptability of the shield excavator.

[Brief explanation of drawings]

Figures 1 to 5 show embodiments of the present invention. Figure 1 is an overall vertical sectional view, Figure 2 is a partially enlarged side view, and Figure 3 is a cross section taken along Arrow view, Figure 4 is Y-Y of turtle diagram
The cross-sectional view shown in FIG. 5 shows a modification corresponding to the Y-Y cross-sectional view in the military map. 1... Shield, 2... Cutter head, 3... Cutter head drive device, 5... Face pressure chamber, 6... Exhaust chamber, 7... Screw conveyor 8... Screw Compare casing, 9... Excavation earth and sand reception port, ]0... False earth entrance, 12... Sediment transfer path, 13A, 138... Partition plate, 15, 16... ...Injection tube. Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5

Claims (1)

[Claims] 1. A screw conveyor is provided between the face pressurization chamber and the earth removal chamber under atmospheric pressure, and an excavated earth and sand reception port is provided at the end of the pressurization chamber of the screw conveyor casing, and an earth discharge port is provided at the end of the earth removal chamber. A shield excavator characterized in that partition plates are provided at a plurality of locations in the earth and sand transfer direction at the upper part of the middle part of the earth and sand transfer path inside the casing, and a viscous agent injection pipe is communicated between these partition plates. soil removal equipment.