JPH06330691A - Soil discharging device of shield drilling machine - Google Patents

Abstract

PURPOSE:To surely discharge drilled earth and sand so as to improve the working efficiency of a drilling work. CONSTITUTION:In the soil discharging device of a shield machine in which drilled earth and sand by means of the cutter device 12 of the shield machine is fed by means of a force-feed pump 19 to a force-feed pipe 20 through a screw conveyor 15, a duct 17 is interposed between the screw conveyor 15 and the force-feed pipe 20. A slider body 25 fitted with a screen 30 for catching drilled large gravel 42 is set to be movable between the catching position in the duct 17 and the take-out position outside the duct 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soil excavating device for a shield excavator which excavates rocks or the like with a shield excavator and then discharges earth and sand and gravel.

[0002]

2. Description of the Related Art FIG. 6 schematically shows a conventional soil excavator for a shield excavator. As shown in FIG. 6, a shield excavator 101 for excavating the ground is configured such that a cutter device 104, which is rotationally driven by a drive motor 103, is attached to the front portion of a cylindrical excavator body 102. Then, the soil discharging device 105 for excavating by the shield excavator 101 is installed in the excavator main body 102 in the screw conveyor 10
6 is attached, and a pressure feed pump 107 and a pressure feed pipe 108 are connected to the screw conveyor 106. Note that 109 is a segment.

Therefore, for example, in order to excavate and form a tunnel having a circular cross section, first, a plurality of shield jacks (not shown) are operated to advance the shield excavator main body 101 through the existing segment 109, while the drive motor 10 is driven.
The cutter device 104 is operated by 3. Then, the earth and sand in front of the shield excavator main body 101 are excavated, the excavated earth and sand is conveyed by the screw conveyor 106, and the pressure feed pump 107 is operated to discharge the earth and sand to the outside through the pressure feed pipe 108. Next, one of the shield jacks is operated in the contracting direction to form a space between the shield jack and the existing segment 109, and the segment is mounted. By repeating this operation, a tunnel of a predetermined length is excavated and formed.

[0004]

By the way, in the ground where the tunnel is excavated and formed, there are target geological features such as a bedrock layer, a gravel layer, and earth and sand. When excavating the ground by a shield excavator, such rock layers, gravel layers, and earth and sand are continuously excavated. In the above-described conventional shield excavator, the screw conveyor 106 and the pressure pump 107 are provided in order to maintain the face soil pressure and prevent the mud from leaking outside.
And the pressure feed pipe 108 are continuously connected in a sealed state.

By the way, in the case of the pipeline pumping of mud by using the pump 107, the soil excavated by the cutter device,
That is, there is a limit to the size of the gravel or foreign matter that can be pumped,
Generally, it is set to 1/3 or less of the inner diameter of the pressure feeding pipe 108. Therefore, if large gravel or foreign matter exceeding the pressure feed limit is mixed in the excavated earth and sand discharged from the screw conveyor 106, the large gravel or the like may cause the suction pump or the discharge valve to malfunction due to clogging the pressure feed pump 107,
If the pumping pipe 108 is clogged and a closed state occurs, it becomes difficult to smoothly discharge the excavated earth and sand, and the work efficiency decreases.

[0006] Further, in order to prevent large gravel or the like exceeding the pressure feed limit from clogging the pressure feed pump 107 or the pressure feed pipe 108, it is conceivable to attach a screen for removing gravel or foreign matter to the suction port of the pressure feed pump 107. . However, as described above, the conventional shield excavator uses the screw conveyor 10 in order to maintain the face soil pressure and prevent the soil from leaking outside.
6, the pressure feed pump 107, and the pressure feed pipe 108 are hermetically connected to each other, and the connection pipe must be disassembled to take out the gravel and the like captured on the screen, which delays the excavation work.

The present invention solves such a problem, and an object of the present invention is to provide an earth discharging device for a shield excavator which surely discharges the earth and sand excavation and improves the work efficiency of the excavation work. To do.

[0008]

In order to achieve the above object, a soil excavator of a shield excavator according to the present invention is provided with a pipe for pumping soil excavated by a cutter of a shield excavator through a screw conveyor by a pump. In a soil excavator of a shield excavator that is fed to and discharged to the outside, a pipe is formed between the screw conveyor and the pressure feeding pipe, and a screen for trapping the excavated large gravel is captured on the pipe. It is characterized in that it can move freely between the and the take-out position outside the conduit.

[0009]

When the rock excavator is excavated by the shield excavator, the earth and sand containing the large gravel excavated by the cutter is fed backward by the screw conveyor. Then, it is fed to the pressure feeding pipe through the conduit by the pressure feeding pump and discharged to the outside. At this time, the gravel and the like mixed in the soil are captured by the screen at the capture position on the pipeline, and the gravel and the like are removed by moving the screen to the removal position outside the pipeline. In this way, the screen removes the large gravel separately from the earth and sand, and prevents malfunction of the pressure-feed pump and blockage of the pressure-feed pipe.

[0010]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a schematic diagram of a soil discharging device of a shield excavator according to an embodiment of the present invention, FIG. 2 is a schematic diagram of a pipeline constituting the soil discharging device, and FIG. 3 is a schematic diagram of a screen in the pipeline. 4 shows a cross section of the pipeline showing the trapped state of the large gravel by the screen of the soil discharging apparatus, and FIG.

As shown in FIG. 1, in the soil discharging device for the shield excavator of this embodiment, a cutter device 12 is provided at the front end of a cylindrical shield excavator body (skin plate) 11.
Is rotatably mounted, and the cutter device 12 can be driven and rotated by a drive motor 13. A screw conveyor 14 for discharging the earth and sand excavated by the cutter device 12 is arranged in the shield excavator main body 11 with its front end portion inclined downward, and the front end portion is inserted into a chamber (not shown). This screw conveyor 14 has a drive motor 15 at the rear part, and can discharge soil and gravel backward.

A pipe line 17 is connected to the earth and sand discharge port at the rear of the screw conveyor 14 via a connecting pipe 16, and the pipe line 17 is connected to a pressure feed pump 19 and a pressure feeding pump via a connecting pipe 18. The pipe 20 is connected. In addition, in FIG. 1, reference numeral 21 denotes this segment for preventing collapse of the wall surface formed by excavation.

In the conduit 17, as shown in FIGS. 2 and 3, the conduit main body 22 is a U-shaped frame, and the flange portion 23 of the connecting pipe 16 is fixed to the upper part thereof, while the lower part is formed. The flange portion 24 of the connecting pipe 18 is fixed to the. A slide body 25 is movably supported on the conduit main body 22 in the longitudinal direction indicated by an arrow in FIG. 2, that is, in a direction blocking the earth and sand feeding direction in the conduit 17, and The slide body 25 can be reciprocally driven by a hydraulic cylinder 26 attached to the end of the conduit body 22.

This slide body 25 has upper and lower flange portions 2
7 and 28 and pipe line portions 29 that penetrate the upper and lower flange portions 27 and 28, and a lattice-shaped screen 30 is attached to the inside of the pipe line portions 29. The length of the conduit portion 29 is set to be larger than the size of excavated large gravel or foreign matter. In addition, earth pressure gauges 31, 3 are connected to the connecting pipes 16, 18.
No. 2 is attached, and it is possible to measure the feed pressure of earth and sand fed into the pipe line 17 and the discharge pressure of earth and sand discharged from the pipe line 17.

In order to excavate and form a tunnel having a circular cross section, first, as shown in FIG. 1, a plurality of shield jacks (not shown) are first actuated in the extending direction, and the shield excavator main body is passed through existing segments. While moving 11 forward, the drive motor 13 operates the cutter device 12. Then, the rock mass in front of the shield excavator main body 11 is excavated, and this excavated earth and sand is dropped into a chamber (not shown). Next, one of the plurality of shield jacks is operated in the contracting direction to form a space between the shield jack and the existing segment 21, and a new segment 17 is mounted.

On the other hand, the excavated soil accumulated in the chamber contains gravel, foreign matter, etc., and is fed to the rear of the excavator main body 11 by the screw conveyor 14. Then, this excavated earth and sand is fed to the pipeline 17 via the connecting pipe 16 by the pressure pump 19. As shown in FIG. 4, the screen 30 in the pipeline 17 is initially in a sediment capturing position, and the excavated sediment supplied from the connecting pipe 16 to the pipeline 17 reaches the screen 30. Therefore, the fine general earth and sand 41 of the excavated earth and sand passes through the screen 30, is fed from the pipe line 17 to the pressure feed pipe 20 through the connecting pipe 18, and is discharged without leaking to the outside. On the other hand, the gravel 42 and the like mixed in the excavated earth and sand are captured by the screen 30.

When a large amount of gravel 42 or the like is accumulated on the screen 30, the flow of sediment downstream of the pipeline 17 is deteriorated and the resistance is increased to increase the sediment feeding pressure into the pipeline 17. The sediment discharge pressure from the inside of the pipe 17 is reduced. Earth pressure gauge 3
Numerals 1 and 32 detect this pressure change (differential pressure), judge that the screen 30 is clogged when reaching a predetermined value, and stop the operation of the shield excavator. The hydraulic cylinder 26
Is operated, and as shown in FIG. 5, the screen 30 together with the slide body 25 is moved to the gravel extraction position outside the conduit 17. At this time, the pipe line 17 (the connecting pipes 16 and 17) is closed by the upper and lower flange portions 27 and 28 of the slide body 25, and the excavated soil does not leak outside. Then, the gravel and the like accumulated on the screen 30 are taken out, and then the hydraulic cylinder 26 again moves the screen 30 together with the slide body 25 to the earth and sand trapping position in the conduit 17.

By repeating such work, a tunnel of a predetermined length is excavated and formed, and excavated earth and sand are efficiently discharged. In this way, the screen 30 causes the gravel 42
Will be taken out separately from the earth and sand 41, so that the malfunction of the pressure pump 19 and the blockage of the pressure pipe 20 can be prevented.

Further, the work of taking out the large gravel 42 can be easily carried out without disassembling the pipe line 17 and the like, and without leaking the outside of the earth and sand. Also, the timing of taking out the gravel 42 can be accurately grasped by measuring the earth and sand feeding pressure by the earth pressure gauges 31, 32. Furthermore, the recovery work to the capture position of the screen 30 after the removal work of the large gravel 42 is also performed by the hydraulic cylinder 2.
This can be done very easily by the operation of 6.

[0021]

As described above in detail with reference to the embodiments, according to the soil excavating device of the shield excavator of the present invention, the earth and sand excavated by the cutter of the shield excavator is pumped through the screw conveyor. In a soil excavator's earth-moving device that feeds to a pressure feed pipe and discharges to the outside, a screen is formed between the screw conveyor and the pressure feed pipe to capture the excavated gravel on the screen. Since it is movable between the position and the take-out position outside the pipeline, the large gravel, etc. mixed in the sediment will be captured by the screen and taken out at the take-out position outside the pipeline, and the screen will remove the large gravel. Therefore, it is possible to improve the work efficiency of excavation work by preventing the malfunction of the pressure-feeding pump and the blockage of the pressure-feeding pipe and reliably discharging the excavated earth and sand.

[Brief description of drawings]

FIG. 1 is a schematic diagram of an earth discharging device of a shield excavator according to an embodiment of the present invention.

FIG. 2 is a schematic perspective view of a pipeline that constitutes the soil discharging device.

FIG. 3 is a schematic perspective view of a screen in a conduit.

FIG. 4 is a cross-sectional view of a pipeline showing a state in which gravel is captured by a screen of an earth removing device.

FIG. 5 is a cross-sectional view of a pipeline showing a state of taking out gravel trapped on a screen of an earth removing device.

FIG. 6 is a schematic view of a soil discharging device of a conventional shield excavator.

[Explanation of symbols] 11 shield excavator main body 12 cutter device 14 screw conveyor 16, 18 connecting pipe 17 pipe line 19 pressure feed pump 20 pressure feed pipe 21 segment 25 slide body 26 hydraulic cylinder 30 screen 31, 32 earth pressure gauge 41 general earth and sand 42 large Gravel

Claims (1)

[Claims] 1. A soil excavator of a shield excavator for feeding earth and sand excavated by a cutter of a shield excavator to a pressure feed pipe by a pressure feed pump via a screw conveyor and discharging the sand to the outside. A shield excavator characterized in that a pipe is formed between the pipe and the screen for trapping the excavated large gravel, and the screen is movable between a trapping position on the pipe and an extraction position outside the pipe. Earthmoving device.