JPH0131680Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is designed to scrape and compact the soil removed by a screw into the center of the shield excavation of a water-retaining sand and gravel layer containing boulders and large-diameter gravel, and to remove mud that flows out with groundwater through the central cavity. For the purpose of blocking the flow, the outer edge of the screw is equipped with a soil consolidation blade that points towards the center, and the inner edge is equipped with a blade to prevent earth from flowing out, which flows together with groundwater. It concerns soil equipment.

In order to make it easier to remove cobblestones and large-diameter gravel from the excavated soil when excavating the ground using the conventional shield method,
Screw conveyors that do not have a spindle in the center have been proposed, but such screw conveyors with only screw blades without a spindle have a large cavity in the center, so excavated earth and sand can be washed away together with groundwater. Furthermore, mud and slurry agents injected for the purpose of water stoppage and lubrication during excavation of the earth have disadvantages such as leakage because the balance with groundwater is not maintained.

In order to eliminate these drawbacks, the present invention provides blades on part or all of the outer edge of the screw to scrape up the discharged soil, and also provides soil flow prevention blades on the inner edge to consolidate the discharged soil. At the same time, water is pushed back to prevent excess water from flowing out and to maintain the required pressure against the ground.The structure is explained with reference to the embodiment shown in the drawings. 1 is the shield machine body; A cutter drum 4 equipped with a cutting machine 3 with appropriate bits arranged radially on the front and a cutter bucket belt 2 on the rear is rotatable around the cutter drum 4 by a radial bearing 5 and the rear by a thrust bearing 6. The cutter drum 4 is supported and rotated by a hydraulic motor 9 via a gear 8 meshing with a tooth ring 7 provided around the cutter drum 4. The earth removal device 10 is connected to the cutter drum 4 of the shield machine constructed as described above through a screw conveyor trough 11 at the center thereof, and a screw 12 is installed at the center of the screw conveyor trough 11 and driven by a screw rotation hydraulic motor 13. A bearing device 14 is supported so as to drive the screw 12, and earth and sand cut by a cutting machine 3 is carried out by the screw 12 and discharged through a discharge port 15. An opening/closing valve 16 is provided at the outlet 15 for the purpose of shutting off water in the ground, and a belt conveyor 17 is provided below this outlet to carry the excavated earth out of the mine.

The present invention relates to a mechanism for preventing soil and water from flowing against the screw 12 in the soil removal device constructed as described above. That is, on the outside of a part or the whole of the screw 12 which does not have a central axis, there is a consolidation blade 18 formed with a slope corresponding to the inner surface of the screw conveyor trough 11 to scrape the earth and sand toward the center. Further, a soil outflow prevention blade 19 is formed protruding toward the center on the inner cavity side.

By configuring the screw 12 as described above, the outer consolidation blades 18 can gather and consolidate the earth and sand in the center, and also serve as a water stop to prevent groundwater from flowing out. By reducing the resistance of contact friction between the screw conveyor trough 11 and the screw conveyor trough 11, earth can be smoothly discharged by the screw. In addition, the mud, slurry, etc. injected into the cutter drum that are about to flow out along with the groundwater along the internal cavity of the screw are combined with the consolidation action of the soil and sand by the outflow prevention blade 19 and the consolidation blade, and the slurry is injected. It has practical effects such as being able to prevent the outflow of liquids and the like and reduce the amount of injection slurry and the like.

[Brief explanation of the drawing]

FIG. 1 is a cutaway side view showing an embodiment of the device of the present invention, FIG. 2 is a partially cutaway side view of a screw conveyor, and FIG. 3 is a partially cutaway front view showing the structure of the screw. 1... Shield machine body, 2... Cutter bucket, 3... Cutting machine, 4... Cutter drum, 5
... Radial bearing, 6 ... Thrust bearing, 7 ... Gear ring, 8 ... Gear, 9 ... Hydraulic motor, 10 ... Earth removal device, 11 ... Screw conveyor trough, 12 ... Screw, 13 ... ... Hydraulic motor, 14 ... Bearing device, 15 ... Discharge port, 16 ... Opening/closing valve, 17 ... Belt conveyor, 18 ... Consolidation blade, 19 ... Sediment outflow prevention blade.

Claims (1)

[Scope of utility model registration request] In an earth removal device using a screw conveyor that does not have a central axis in a shield excavation device for excavating a standing water sand and gravel layer containing boulders, large-diameter gravel, etc., the outer edge of this earth removal screw 12 has an inner surface of the screw conveyor trough 11. In the part corresponding to the area, there is a raking blade 18 for compaction of earth and sand that forms a slope toward the center and for water stopping.
At the same time, the inner edge is provided with a water-stop blade for preventing earth and sand from flowing out in the earth pressure type shield construction method, which is formed by protruding toward the center a sediment-flow prevention blade 19 having a slope continuous with the slope on the inner surface. Screw type soil removal device.