JPH0258437B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shield excavator that includes a chamber formed by the outer shell of the main body and a partition wall at the front of the shield main body, and excavates while filling the chamber with excavated earth and sand.

FIG. 1 shows an example of a conventional blind shield excavator. This shield tunneling machine has an opening 14a in a part of a partition wall 14 that is integrated with a shield hull outer shell 13, and a shield jack 17 in a chamber 15 formed at the front of the shield main body.
The earth pressure generated by the thrust of It is to be discharged outside.

Figure 2 shows an example of a conventional earth pressure shield excavator. This shield excavator is a shield hull outer shell 1
A rotary excavator 22 is attached to the bulkhead 20 that is integrated with 9.
is supported via a bearing 21, and a rotary excavator 22 is rotated by a drive machine (for example, a hydraulic motor) 23 attached to the bulkhead 20 to excavate earth and sand, and the chamber is filled with the excavated earth and sand while penetrating the bulkhead 20. The screw conveyor 25 installed in this manner is configured to temporarily discharge the waste into the shield machine or into the mine. The shield tunneling machine is propelled via a shield jack 24.

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

(a) Since the excavated soil is exposed inside the shield machine and inside the mine, the soil becomes very dirty due to spilled soil, etc., and cleaning it is troublesome.

(b) Transportation means (belt conveyor, shear truck, etc.) are required to transport the earth and sand discharged into the shield machine to the outside of the mine.

(c) When the excavated soil in the water-retaining sand layer is discharged using a screw conveyor, groundwater comes out along with the soil.
It is necessary to install a rotary feeder (not shown) or a cone valve as a groundwater blowout prevention device.

(d) Screw conveyors, belt conveyors, etc. are installed inside the machine, making the machine interior small and making operation and segment assembly difficult.

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

This invention is intended to eliminate the above-mentioned drawbacks, and provides 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 performs excavation while filling the chamber with excavated earth and sand. A pressure feed pipe with a receiving port opened inside the chamber or into a dirt reservoir connected to the chamber is attached to the bulkhead, and is slidably inserted into the fixed outer cylinder and the fixed outer cylinder, and the opening is made by the extension movement. The earth and sand pumping device, which consists of an inner cylinder whose end is connected to the receiving port of the pumping pipe and a piston housed in the inner cylinder, is installed inside the chamber or inside the earth and sand reservoir connected to the chamber. do.

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

Shield hull shell 3 forming shield body 1
A rotary excavating tool (cutter wheel) 2 having an excavating bit attached thereto and having a chamber 6 inside is rotatably supported via a bearing 7 on a partition wall 4 provided integrally with the excavating tool. 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 performing pile-up are installed at intervals in the circumferential direction.

An end portion of a pressure feed pipe 9 passes through the partition wall 4, and an opening 10 for receiving excavated earth and sand is provided at the opening of the pressure feed pipe 9 on the side of the chamber 6. For the receiving port 10, an earth and sand pumping device P consisting of a dual inner and outer cylinder is installed. Sediment pumping device P
An outer cylinder 11 constituting the is fixed to the partition wall 4, an inner cylinder 12 is slidably inserted into the outer cylinder 11, and a piston 13 is inserted into the inner cylinder 12. It is contained. Pressure oil supply and discharge ports 14 and 15 are provided in the end wall and side wall of the outer cylinder 11, respectively, and both pressure oil supply and discharge ports 14 and 15 are connected to a pressure oil source via a switching valve (not shown). and connected to the oil tank. One end of the inner cylinder 12 is open, and a pressure receiving part 16 having a pressure receiving chamber 17 and communication holes 18 and 19 is integrally attached to the other end, and a stopper is provided in the middle part. 20 is formed, and a thin tube 21 extending through the communication hole 19 is attached to the pressure receiving portion 16. The piston 13 is integrated with a tube body 22 inserted into a hole in a stop wall 20.
A pressure receiving part 23 having a pressure receiving chamber 24 is integrally attached to the end opposite to the piston. Pipe body 2
A hole 25 is provided in the wall portion near the pressure receiving portion 23 of No. 2.

Figure 4 shows the inner cylinder 12 and piston 1.
3 is shortened and the receiving port 10 is open, and in this state, the chamber 6 is filled with excavated earth and sand 26.

If pressure oil is supplied through the pressure oil supply/discharge port 14 in the state shown in FIG.
is pushed out. That is, an expansion operation is performed. At this time, the inner cylinder 12 is pushed out while passing through the excavated earth and sand 26 filled in the chamber 6, so the inner cylinder 12 is filled with earth and sand, and the open end of the inner cylinder 12 is the receiving opening. Since it is in close contact with the end face of the inner cylinder 10, the earth and sand are sealed inside the inner cylinder 12. Pressure receiving part 16
is received by the bottom of the outer cylinder 11. FIG. 5 shows the situation. The pressure oil in the outer cylinder 11 is discharged from the supply/discharge port 15, and the pressure oil in the inner cylinder 12 is discharged from the supply/discharge port 15 through the hole 25, the thin tube 21, and the communication hole 19.

When the piston 13 is further pushed out from the state shown in FIG. 5 via the pressure receiving part 23, the inner cylinder 1
The earth and sand sealed in the container 2 is pushed out by the piston 13 into 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 received by the stop wall 20 and the piston 13 has reached the extrusion 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 piston 13 and inner cylinder 12 are retracted. Return to the state shown in FIG.

By repeating such operations, the excavated earth 26 filling the chamber 6 can be sent out through the pressure pipe 9 to the outside of the mine.

According to the invention described above, the following effects can be obtained. That is, since the excavated earth and sand is directly pumped from inside the chamber to the outside of the mine through the pumping pipe by the sand pumping device, there is no need for belt conveyors, shear trucks, etc., and the space inside the machine is widened, improving the working environment. Moreover, 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. In addition, it is possible to easily deal with underground water gushing by installing a valve in the pressure pipe, and furthermore, by installing multiple soil pumping devices in the chamber, continuous excavation can be performed, which is efficient. be.

[Brief explanation of drawings]

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. FIGS. 4, 5, and 6 are enlarged sectional side views showing the operating state of the pumping device in FIG. 3. 1...Shield body, 2...Rotating drilling tool, 4...
...Partition wall, 6...Chamber, 8...Shield jack, 9...Forcing pipe, 10...Reception port, P...Earth and sand pumping device, 11...Outer cylinder, 12...
Inner cylinder, 13... Piston, 14... Pressure oil supply/discharge port, 15... Pressure oil supply/discharge port, 16... Pressure receiving part, 18, 19... Communication hole, 20... Stopping wall, 2
1...Thin tube, 22...Tube body, 23...Pressure receiving part, 2
5...hole.

Claims (1)

[Claims] 1 In a shield excavator that has 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 performs excavation while filling the chamber with excavated soil, the excavated soil is received in the chamber or in a sand reservoir connected to the chamber. A pressure feed pipe with an open mouth is attached to a bulkhead, and a fixed outer cylinder is slidably inserted into the fixed outer cylinder, and its extension action connects the open end to the receiving port of the pressure feed pipe. An earth and sand pumping device consisting of a gawa cylinder and a piston housed in the inner gawa cylinder is installed inside the chamber.
Or a shield excavator characterized by being installed in a sand pit connected to a chamber.