JPS58195697A - Shield drilling machine - 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] This invention relates to a shield excavator that includes a chamber formed by the outer shell of the main body and a partition wall in the front part of the shield main body, and excavates without filling the chamber with excavated earth and sand. It is.

FIG. 1 shows an example of a conventional blind shield excavator. This shield tunneling machine has an opening 14a in a part of the partition wall 14 that is integrated with the shield hull outer shell 13, and allows the thrust of the shield jack 17 to pass through the chamber 15 formed in the front part of the shield body. By generating earth pressure, the earth and sand 16 in the chamber 15 are squeezed out from the opening 14a, and this is once discharged into the shield machine, and the discharged earth and sand is carried outside the mine by a belt conveyor 18 or a pickpocket truck (not shown). It is something to be discharged.

Figure 2 shows an example of a conventional earth pressure shield excavator. This shield excavator has a rotary excavator 22 supported via a bearing 21 on a bulkhead 20 that is integrated with a shield hull outer shell 19, and is driven by a drive machine (for example, a hydraulic motor) 23 attached to the bulkhead 20. The partition wall 20 is rotated to excavate the earth and sand, and the chamber is filled with the excavated earth and sand.
A knee conveyor 25 installed through the sulphate 11 is configured to temporarily discharge the waste into the inside of the /-old machine or into the mine. The propulsion of the shield tunneling machine is the shield.

This is done via the jack 24.

The conventional shield excavator described above has the following drawbacks because the excavated soil is discharged into the -H shield machine.

(a) Since the excavated earth and sand is exposed inside the shield machine and inside the mine, it becomes very dirty due to falling earth and sand, and cleaning it is troublesome.

Φ) A transporter f (belt conveyor, shear truck, etc.) is required to transport the earth and sand discharged into the shield machine to the outside of the mine.

(C) Is it necessary to use a screw conveyor to excavate the soil in the water-retaining sand layer, or to install a cone bulker, etc.?

(d) Since screw conveyors, belt conveyors, etc. are installed inside the machine, the inside of the machine becomes narrow, making operation and segment assembly difficult.

(e) Excavated soil is usually transported out of the mine using a shear truck, but in this case, excavation is restricted by the transport container of the shear truck, resulting in intermittent operation, resulting in long waiting times and poor efficiency.

This invention is intended to eliminate the above-mentioned drawbacks, and includes a fixed outer cylinder and an inner cylinder slidably inserted into the fixed outer cylinder, in a chamber or in an earth and sand reservoir connected to the chamber. , an earth and sand pumping device consisting of a piston placed in the inner gill 11 was installed, and the inner gill 11
Attach the pressure-feeding pipe, which has an inlet facing the open end of the cylinder, to the bulkhead, protrude the inner cylinder, connect its open end to the inlet of the pressure-feeding pipe, and insert the piston. It is characterized by being constructed in the shape of □ so that the excavated soil is discharged through the pressure feeding pipe by extrusion.

Hereinafter, one embodiment of this invention will be explained with reference to FIGS. 3 to 6.

1 A drilling bit is attached to a partition wall 4 provided integrally with the shield hull outer shell 3 forming the shield body 1', and a rotary drilling tool (cutter wheel) 2 equipped with a chamber 6 inside is rotatable via a bearing 7. is supported by The rotary excavator 2 is configured to be rotated via a gear transmission connected to the output shaft of a drive machine (for example, a hydraulic motor) 5 fixed to the partition wall 4 . On the inner peripheral wall of the shield body 1,
A plurality of shield jacks 8 for propulsion are installed at intervals in the circumferential direction. The end of the pressure feed pipe 9 is passed through the partition wall 4, and the pressure feed pipe 9 next to the chamber 6 is passed through the partition wall 4. A receiving opening for excavated earth and sand is provided in the opening. For the receiving port 10, an earth and sand pumping device P consisting of a dual inner and outer cylinder is installed. An outer cylinder 11 constituting the earth and sand pumping device P is fixed to the partition wall 4, and an inner cylinder 11 and an inner cylinder 12 are slidably inserted into the outer cylinder 11. A piston 13 is housed inside. □
A pressure oil supply/discharge port 14.15 is provided in the end wall and side wall of the outer cylinder 11, respectively, and a double pressure oil supply/discharge port 14.
15 is connected to a pressure oil source and an oil tank via a switching valve (not shown). One end of the inner liner II cylinder 12 is open, and the other end has a pressure receiving chamber 17 and communication holes 18 and 19.
A pressure receiving part 16 is integrally attached thereto, a stopper 20 is formed in the middle part, and a thin tube 21 extending through a communication hole 19 is attached to the pressure receiving part 16. The piston 13 is integrated with a tube body 22 inserted into a hole in the stop wall 20, and a pressure receiving part 23 having a pressure receiving chamber 24 is integrally attached to the end of the tube body 22 on the side opposite to the piston. It is being A hole 25 is provided in the wall portion of the tube body 22 near the pressure receiving portion 23 .

FIG. 4 shows a state in which the inner cylinder 12 and piston 13 are shortened and the receiving port 10 is open, and in this state, the chamber 6 is filled with excavated earth and sand 26.

In the state shown in FIG. 4, if pressure oil is supplied through the pressure oil supply/discharge port 14, hydraulic pressure acts on the pressure receiving portion 16.23, and the inner cylinder 12 and piston 13 are pushed out. That is, an expansion operation is performed. At this time, inner cylinder 1
2 is pushed out while passing through the excavated earth and sand 26 filled in the chamber 6, so that the inner cylinder 12 is filled with earth and sand, and the open end of the inner cylinder 2 comes into close contact with the end surface of the receiving port 10. The earth and sand are sealed inside the cylinder 12. The pressure receiving part 6 is stopped by the bottom of the outer cylinder 1. FIG. 5 shows the situation. Note that the pressure oil in the outer sill 1.1 and the holder 11 is supplied from the supply/discharge port 15, and the pressure oil in the inner sill 11 and 12 is supplied from the supply/discharge port 15 through the hole 25, the thin tube 21, and the communication hole 19. be ejected.

From the state shown in FIG. 5, the piston 1 is further
3 is pushed out, the earth and sand sealed in the inner cylinder 12 is pushed out by the piston 13 to the pressure feed pipe 9 and is discharged through the pressure feed pipe 9. FIG. 6 shows a state in which the pressure receiving portion 23 is stopped by the restraining wall 2o and the piston 13 has reached the insertion completion position. In the state shown in FIG. 6, when the switching valve is switched and pressure oil is supplied from the supply/discharge port 15, the pressure oil is introduced through the communication hole 19 and the thin tube 21, and the pressure oil is introduced into the piston 13 and the inner liner II cylinder 12.
is pulled in and returns to the state shown in figure m4.

By repeating such an operation, the excavated earth 26 filling the chamber 6 is sent out through the pressure pipe 9 to the outside of the mine.

According to this invention explained above, the following effects can be obtained.

(1) Since the excavated soil is not exposed inside the mine, the inside of the mine can be kept clean and there is no need to clean up the soil.

(2) Since the excavated earth and sand is directly pumped from inside the chamber to the outside of the mine through the pumping pipe, there is no need for belt conveyors, shear trucks, etc.

(3) Erosion of underground water can be easily dealt with by installing a valve in the pressure pipe.

(4) Since there is no need for a knee conveyor for conveying excavated soil, etc.,
・□゛The space becomes wider and the work environment becomes better.

(5) If multiple earth and sand pumping devices are installed in the chamber,
It is efficient to perform continuous excavation.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional side view showing an example of a conventional blind shield tunneling machine, FIG. 2 is a cross-sectional side view showing an example of a conventional earth pressure shield tunneling machine, and FIG. 3 is an embodiment of a shield tunneling machine according to the present invention. Cross-sectional side views showing aspects, FIGS. 4 and 5,
6 is an enlarged cross-sectional side view showing the operating state of the pumping device in FIG. 3. FIG. l e-book shield body, 2. one rotation drilling tool, 4.
[i, 6@・Chamber, 8@・Shield Jack,
9... Pressure feeding pipe, 10 - Receiving port, P - Chisel sand pressure feeding device, 11 Working - Outer cylinder, 12...
Inner cylinder, 13.0 piston, 14
・・Pressure oil supply/discharge port, 15・・Pressure oil supply/discharge port, 16-
Pressure receiving part, 18. 19III + communication hole, 20...stopping wall, 21...thin tube, 22...pipe body, 23.
・Pressure receiving part, 25@・hole

Claims (1)

[Claims] In a shield excavator, which has a chamber formed by a permanent outer shell and a partition wall in the front part of the shield body, and performs excavation without filling the chamber with excavated earth and sand, inside the chamber or inside an earth and sand reservoir connected to the chamber, An earth and sand pumping device is installed, which consists of a fixed outer cylinder, an inner cylinder slidably inserted into the fixed outer cylinder, and a piston housed in the inner cylinder. Attach the pressure-feeding pipe with an inlet facing the end to the bulkhead, project out the inner cylinder 11, and connect the open end to the inlet of the pressure-feeding pipe.1. A shield excavator characterized by being configured to discharge excavated earth and sand through a pressure feed pipe by pushing out a piston.