JPS5820895A - Hydraulic control type mud pressure shield engineering method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention uses a screw conveyor to discharge the waste in the excavated soil intake chamber corresponding to the face in the Tonosho shield, suppresses collapse of this face by water pressure, and utilizes water flow. In the Shoshiki shield, which excavates while carrying out waste, a waste removal port and a pressure water supply port are installed at the rear of this screw conveyor, and a control valve is connected to the waste removal port to connect to a sediment settling tank with a partition. The water is discharged into the settling chamber, and the water separated from this settling tank K is sent to the pressure water supply port by a pump through a regulating valve, and this pressurized water is used as suppression water and waste discharge to the face. Configuring the shape and controlling this water flow pressureK
Therefore, the present invention relates to the water pressure controlled Tonosho shield construction method, which is characterized by controlling the water pressure of the screw conveyor and the face, and the screw conveyor's waste extraction port during excavation in a water retention layer or a pressurized water layer during Tonosho shield construction. This makes difficult flood control treatment easier.

Conventional shield construction methods of this type include, for example, the face mud pressurization method, the method of equipping the scrap conveyor's waste outlet with rotary pulp, or the method of connecting slurry transport equipment, etc. However, with the face mud pressurization method, The method is to send clay soil to the face and stir it at the same time as excavation to give fluidity and watertightness to the waste, and then pull it out with a screw conveyor, but this method has the disadvantage of requiring expensive materials for clay soil. . In addition, with the method of equipping the waste removal port with rotary pulp, soil is continuously removed while partially blocking the inside and outside of the screw conveyor. There are disadvantages such as high replacement costs required for replacement.Also, in the slurry transportation method, the slurry pump is transported from the screw conveyor to the outside of the mine, and soil and water are separated and treated outside the mine. Each has its own drawbacks, such as high costs and running costs.

In order to eliminate such drawbacks and perform the work efficiently, the present invention provides a sediment settling tank with a partition between the shield screw conveyor and the waste loading device at the rear of the mine, and the sediment settling tank is One side is used as a separate ice chamber, and a submersible pump is installed, the outlet of which is connected to the water supply port of the screw conveyor via a regulating valve, and a regulating valve is connected to the sludge discharge port of the screw conveyor on the other hand. Attach the provided sludge drainage pipe and open it to the sedimentation chamber of the sedimentation tank, and then use the screw conveyor KJ. This is a 5K construction method in which a circulation circuit is formed to pressure feed the screw conveyor using a submersible pump, and the water pressure inside the screw conveyor and the amount of waste discharge are adjusted by the adjustment 9t"K, and the construction method is implemented. To explain the drawing as an example, (11 is the sum of the shield body and the cutter drum (3) with 1 bit (2)...
1 is arranged to be rotated by a motor (4) - its center is connected to the casing (6) of the screw conveyor (5).
The rotary shaft (51) of this screw conveyor (5) is supported at the center of the cutter drum (3;
At the rear end of the casing (6) of this screw conveyor, a water pipe socket (8) and a sludge drainage pipe installation port (91), which will be described later, are provided. In the present invention, a partition +1 is provided between the screw conveyor (5) of the shield body and the belt conveyor for loading the earth and sand into the steel car. Separate sedimentation tanks (1
1), and a submersible pump (
1'A, and its discharge port is connected to the casing (6) of the screw conveyor via the regulating valve I by the water pipe 03.
) is connected to the socket (81), and the other mounting port (91
K connects the sludge draining pipe Oe via the regulating valve ri9 and opens its tip above the settling chamber Φ1 of the water tank Ql+, and this (
b) A waste removal conveyor aη is installed in the lower part of the chamber, and a loading belt conveyor is provided below the rear discharge port (18). .

The present invention will be described with reference to the embodiment configured as described above.When excavating by propelling the shield body, water is first injected into the water tank aυ, the submersible pump O'A is operated, and the water pipe is Adjustment valve I of a3 and adjustment valve a9 of sludge pipe Qe are adjusted to balance the water pressure in both pipelines and the water pressure in the screw conveyor (5), and the excavated soil is forcibly drawn out by the screw conveyor (51). The sedimentation chamber (blK) of the sedimentation tank αD is discharged using the water flow of the mud discharge pipe a61.The sediment in the muddy water sent to the chamber (Φ) in this way sinks naturally and is pulled out by the conveyor surface, and then It is discharged from the discharge port (Igl) of the belt conveyor (A) K, from where it is loaded onto a steel car, etc., and transported outside the mine.
The water from which the earth and sand has been separated in 1 passes over the upper end of partition 00 and flows into the room (!1), from where it is sent by submersible pump a21 via water pipe I to screw conveyor +51K, where it is used again as circulating water. .

As described above, according to the construction method of the present invention, the pressure water against the face of the Tonosho shield is drawn out inside the screw conveyor.
The water flow from the sludge pipe is used to introduce the supernatant water into the sedimentation tank, where the supernatant water is separated and circulated to the screw conveyor while being regulated by a regulating valve. While controlling the water pressure in the circulation circuit to be balanced, the waste deposited in the water tank can be efficiently transported out of the mine by a pull-out conveyor. Moreover, it has exceptional effects and features that allow it to achieve the intended purpose with relatively low equipment costs.

[Brief explanation of drawings]

The attached drawing is a partially cutaway side view showing an embodiment of the construction method of the present invention. (11...Shield body, (2)...Bit, (3;...
・Cutter drum, (4)...motor, (5)...screw, knee conveyor, <51...rotating shaft, (6)...
Casing, (71-・Motor, (8)・Socket,
(9I...Entrance with trench, O1'I...Partition, Ql)・Working sedimentation tank, 0'A...Water 19;t! Nff, Q;l II water pipe, Q41. a5) 111111fP. αe...Sludge drainage pipe, (lη...Drawer conveyor, QI...Discharge port, (A)@-Belt conveyor, (a)...Water chamber, (b)...Sedimentation chamber.

Claims (1)

[Claims] A separate device is installed to pass the muddy water extracted from the waste extraction port of the Tonosho shield, which is equipped with a closed excavator intake chamber against the face and a screw conveyor that pulls out the excavated earth backwards, through a regulating valve. It is introduced into the sedimentation chamber of the water tank where the sediment is separated and carried out outside the mine.
The water pressure on the screw conveyor and face is controlled by circulating the separated water by pumping it through a regulating valve to the screw conveyor and adjusting the water flow pressure with the adjustment 9PK.
Features 1, water pressure iw ceremonial pressure, riwo body doe method.