JPH0988483A - Earth discharging device for shield machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively remove earth and sand adhering to the screw of a rotary speed reducing pipe which reduces the pressure of carried earth and sand. SOLUTION: A rotary speed reducing pipe 11, which is formed by splitting part of a casing 7, supported so that the pipe 11 can be rotated around the axis of the casing 7 and rotated by decelerating rotation devices 12A, 12B in the same direction as that of a screw 8, is provided. Earth and sand washing devices 31A and 31B which eject washing water upon the screw 8 from washing water ejecting holes 32A and 32B are attached to the pipe 11. Therefore, earth and sand adhering to the screw 8 can be effectively removed with the washing devices 31A and 31B before the earth and sand become solid after earth and sand are discharged.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an earth discharging device for a shield machine.

[0002]

2. Description of the Related Art Conventionally, in a shield machine, a cutter head on the front side excavates the ground, and a pressure chamber provided in the front part of the shield main body keeps the face collapse soil pressure, and the excavated earth and sand is excavated by an excavator. The pressure is attenuated and discharged to the atmosphere side. For example, in an earth pressure type shield for a sealed shield machine, a screw conveyor type earth discharging device having a conveying screw built in a cylindrical casing is provided as an earth discharging device.

The above-mentioned screw conveyor type soil discharging device attenuates soil water pressure in the pressure chamber and discharges it to the atmosphere side.
In case of excavation at a large depth, it is necessary to improve the pressure damping effect. Usually, as a measure against the pressure attenuation of the screw conveyor device, it is customary to lengthen the conveying distance, but as a device arranged in a limited space such as a shield machine, for example, Japanese Examined Patent Publication No. 4-23957 or Actual Kaisho 6
Japanese Laid-Open Patent Publication No. 1-68195 discloses a casing in which a rotary reduction cylinder rotatable in the same direction as the screw is provided in a part of the casing.

[0004]

When the rotary reduction cylinder is rotated in the same direction as the screw to reduce the feed rate of the sediment, or when the feed is stopped, the sediment is apt to adhere to the screw or the screw shaft, and the operation is reduced. If left in a stopped state, it solidifies and firmly adheres, and it may take a lot of labor and time to remove it. However, the inside of the casing is sealed with a pressure resistant structure, and even if the operation of the earth unloading device is stopped, the earth and sand adhering to the screw cannot be quickly removed and eventually solidifies, making removal difficult.

The present invention solves the above problems and provides an earth unloading device for a shield machine which can quickly remove the earth and sand attached to the screw in the rotation reduction cylinder and prevent solidification and sticking. To aim.

[0006]

In order to achieve the above object, the invention according to claim 1 is a cylindrical casing having an inlet connected to a pressure chamber in the front part of the shield body and an outlet opened to the atmosphere side. In the soil discharging device of the shield machine equipped with a screw conveyor device having a spiral screw built-in, a part of the casing is divided and a rotation reduction cylinder rotatably supported around the axis of the casing, The rotation reduction cylinder is provided with a reduction rotation device capable of being rotationally driven in the same direction as the screw, and the rotation reduction cylinder is provided with a soil / sand cleaning device for injecting cleaning water toward the screw.

According to the first aspect of the present invention, after the earth discharging device is stopped to discharge the earth and sand inside, the cleaning means is immediately activated to inject the cleaning water toward the screw to solidify. It is possible to completely remove the previous adhered earth and sand and prevent the earth and sand from sticking to the screw corresponding to the rotation reduction cylinder.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will now be described with reference to FIGS. As shown in FIG. 4, the rotary drive unit 2 is provided at the front of the shield body 1 of the shield machine.
The cutter head 3 which is swung by the above is disposed, and a pressure chamber 5 for holding the face collapsing pressure is formed in the front portion of the shield body 1 through the pressure partition wall 4. The pressure partition wall is provided with an earth discharging device 6 for discharging the earth and sand excavated by the cutter head 3 from the pressure chamber 5.

The soil discharging device 6 is composed of a screw conveyor device 9 having a spiral screw 8 with a shaft in a cylindrical casing 7 having an inlet opened through the pressure partition wall 4. And in the middle part of the casing 7,
As shown in FIGS. 1 to 3, the rotary speed reduction cylinders 11A and 11B for discharging the earth and sand while maintaining the face collapse soil pressure in the pressure chamber 5, the speed reduction rotation devices 12A and 12B, and the screw drive device 1
3 is arranged, and a resistance device 15 is provided in the plug zone 14 in which the screw 8 is removed.

The rotation reduction cylinders 11A and 11B are formed by cutting out portions of the casing 7 over predetermined lengths L1 and L2, respectively, and sealing the support cylinders 21A and 21B attached to the casing 7 via flanges at the outer peripheral portions. It is rotatably supported through the material. In addition, the deceleration rotation device 12
A and 12B are attached to the gear cases 23A and 23B provided on the outlet side of the rotation reduction cylinders 11A and 11B, respectively.
Reduction ring gears 25A and 25B fixed to the collar portions 24A and 24B of A and 11B, and the reduction ring gear 25
There are provided deceleration pinions 27A and 27B which are meshed with A and 25B and driven by deceleration motors 26A and 26B. Then, by the soil discharge adjusting device 28 provided in the control room of the shield machine, the deceleration motors 26A, 26B
Is controlled according to the property of the discharged earth and sand, and the rotation speed of the rotation reduction cylinders 11A, 11B can be arbitrarily adjusted within a range from 0 to the same speed in the same direction as the screw 8.

Further, the deceleration cylinders 11A and 11B are provided with earth and sand cleaning devices 31A and 31B as cleaning means. The earth and sand cleaning devices 31A and 31B include the rotation reduction cylinder 11
A plurality of cleaning water injection holes 32A and 32B formed at predetermined intervals in A and 11B, and cleaning water injection holes 32A and 32B
To the rotary joints 34A and 34B for supplying washing water to the rotary joints 34A and 34B respectively via the water supply pipe 33 or directly to the rotary joints 34A and 34B.
A cleaning water supply device 36 for supplying cleaning water from the outside via A and 35B. As a result, after the earth and sand are discharged and the operation is stopped, the wash water injection holes 32A, 32B
Thus, the cleaning water can be sprayed between the shaft and the blade of the screw 8 in the stopped state or the rotating state to quickly remove the adhered earth and sand.

It is also possible to construct the earth and sand cleaning device only with the cleaning water injection hole with the water blocking plug, and manually connect the cleaning water supply hose in place of the water blocking plug during maintenance.

The screw drive device 13 includes a casing 7
Is rotated by a drive cylinder 41 that is partly divided and fixedly connected to the screw 8, a drive ring gear 43 that is fixed to the flange portion 42 of the drive cylinder 41, and a screw drive motor 45 that is arranged in a case 44. The screw drive pinion 4 driven and meshed with the drive ring gear 43
6.

The resistance plate device 15 is provided with, for example, a pair of rectangular resistance plates 52 that can freely move in and out of the plug zone 14 through a long hole 51 formed in the casing 7. The resistance plate 52 is connected to the piston rods of a plurality of retractable cylinders 54 supported through a support frame 53, and is moved in and out in the approaching / separating direction, and is projected into the plug zone 14, so that the resistance plate 52 and the earth and sand are deposited. By the frictional force between and, it is possible to damp the pushing force of the earth and sand and maintain the collapsed earth pressure of the pressure chamber 2. Here, although the long hole 51 is formed parallel to the axis, it may be formed with an inclination angle.

In the above structure, the earth and sand excavated by the cutter head 3 is taken into the pressure chamber 5 and
The pressure chamber 5 holds the ground collapsed earth pressure. Then, it is conveyed backward by the screw conveyor device 9 which is the soil discharging device 6 and discharged to the rear space at atmospheric pressure. At this time, the earth and sand conveyed in the casing 7 by the screw 8 are transmitted by the rotation driving devices 12A and 12B for speed reduction to rotate the rotation reduction cylinders 11A and 11B in the same direction as the screw 8 to transmit the conveyance driving force to the earth and sand. Is halved, for example, the screw 8 and the rotation reduction cylinders 11A, 11
By rotating B and in the same direction at the same speed, the earth and sand co-rotate and no conveying force is transmitted, and the earth and sand are conveyed to the outlet side while being consolidated by the conveying force from the inlet side,
The earth pressure in the pressure chamber 5 is effectively retained. Further, when approaching the plug zone 14 where the screw 8 is not provided, due to the frictional resistance between the protruding resistance plate 52 and the earth and sand, the earth and sand pushing force due to earth pressure in the pressure chamber 5 is attenuated and the earth and sand plug is effectively operated. R. As a result, even if the face collapse soil pressure is large at a large depth and the conveying distance by the screw conveyor device 9 is short, the soil pressure in the pressure chamber 5 can be sufficiently maintained. Moreover, since the amount of sediment carried out is not reduced and a narrow passage space is not formed, crushed stones are not clogged.

Further, when the rotation speed reduction cylinders 11A and 11B are rotated in the same direction as the screw 8 so that the transport driving force for the soil is reduced to half or eliminated, the soil easily adheres between the shafts and blades of the screw 8. It becomes a state. Even if all the earth and sand in the casing are carried out after the operation of the earth unloading device 6 is finished, the earth and sand attached between the shaft of the screw 8 and the blades remains. If it is left as it is, the earth and sand solidify and firmly adhere to each other, and it takes a lot of labor and time to remove the earth and sand during the subsequent maintenance. In this embodiment, the earth and sand cleaning devices 31A and 31B attach the earth and sand. Cleaning water can be sprayed from the cleaning water spray holes 32A and 32B onto the soil to easily and quickly remove the soil before solidification.

In the above embodiment, the screw 8 is used.
Although the screw is a shaft screw, it may be a ribbon screw having no central shaft.

[0018]

As described above, according to the first aspect of the invention, after the earth discharging device is stopped to discharge the earth and sand inside, the cleaning means is immediately activated to wash the water toward the screw. By injecting, it is possible to completely remove the adhered earth and sand before solidification, and it is possible to prevent the earth and sand from sticking to the screw corresponding to the rotation reduction cylinder.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an embodiment of an earth discharging device according to the present invention.

FIG. 2 is an enlarged cross-sectional view taken along the line AA shown in FIG.

FIG. 3 is a sectional view taken along line BB shown in FIG.

FIG. 4 is a schematic cross-sectional view of a shield machine equipped with the soil discharging device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shield main body 3 Cutter head 4 Pressure partition wall 5 Pressure chamber 6 Soil discharging device 7 Casing 8 Screw 9 Screw conveyor device 11 Rotating speed reducing cylinder 12 Speed reducing rotating device 13 Screw driving device 14 Plug zone 15 Resistance plate device 26 Speed reducing motor 28 Discharge Soil adjusting device 31A, 31B Sediment cleaning device 32A, 32B Cleaning water injection hole 34A, 34B Rotary joint 35A, 35B Water supply hose 36 Cleaning water supply device 45 Screw drive motor

Claims (2)

[Claims] 1. A shield machine having a screw conveyor device having a spiral screw built in a cylindrical casing having an inlet connected to a front pressure chamber of a shield body and an outlet open to the atmosphere side. In the soil discharging device, there are provided a rotation reduction cylinder in which a part of the casing is divided and rotatably supported around an axis of the casing, and a rotation device for reduction capable of rotationally driving the rotation reduction cylinder in the same direction as the screw. A soil excavator for a shield machine, wherein the rotary deceleration cylinder is provided with an earth and sand washing device for injecting washing water toward a screw. 2. The earth and sand cleaning device comprises a cleaning water injection hole formed at a plurality of positions on a rotary reduction cylinder, a rotary joint connected to the cleaning water injection hole, and cleaning water for supplying the cleaning water to the rotary joint. The earth removing device for a shield machine according to claim 1, wherein the earth removing device comprises a supply device.