JPH0415832Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to an enclosed shield tunneling machine.

(Prior art) Fig. 5 shows a conventional closed type shield excavator, in which soil excavated by a cutter b attached to the front end of a shield body a is removed by a bulkhead c disposed at the front of the shield body a. A viscosity imparting material is taken into the defined chamber and is injected and kneaded into the excavated soil in the same chamber through a pipe d, inside a screw conveyor e connected to a bulkhead c for the purpose of preventing the earth from erupting. The soil is filled with the excavated soil, and the excavated soil is discharged from the rear soil discharge gate f of the screw conveyor e while the soil is excavated.

In the figure, g is a propulsion jack, h is a cutter driving motor, i is a screw trough, j is a screw blade, k is an earth removal gate plate, and l is an earth removal gate jack.

(Problems to be solved by the invention) In the conventional shield excavator, the opening ratio of the excavated soil is adjusted in order to prevent the eruption from the excavated soil in the screw conveyor. If an attempt is made to excavate while maintaining the excavated soil, the soil discharge gate is always open, so groundwater and viscosity imparting material may flow out through the gate, and the excavated soil may not be consolidated.

In addition, in order to maintain the excavated soil in a consolidated state, the excavated soil may not be kept compacted during excavation by closing the soil discharge gate and opening the gate after once consolidating the excavated soil. There may be cases where it is necessary to repeatedly open and close the soil discharge gate.

Furthermore, the operation of opening and closing the soil discharge gate is performed by sliding the soil discharge gate plate through the soil discharge gate jack, so if the same gate is opened and closed repeatedly, the operation becomes complicated. Safe and reliable consolidation and soil removal are difficult.

(Means for Solving the Problems) The present invention is an attempt to solve these problems, and is aimed at solving the problems described above. A cylindrical rotating body having a through hole and rotating at a variable speed is arranged concentrically with the trough on the circumferential side, and soil removal holes are provided in the screw trough at a portion corresponding to the through hole of the rotating body. The purpose is to automatically repeat the consolidation and removal of excavated soil even under high water pressure, and to adjust the degree of consolidation of the excavation work. An object of the present invention is to provide an improved closed type shield excavator that can prevent blowouts.

(Function) Since the closed type shield excavator according to the present invention is configured as described above, the screw trough in the soil discharge gate portion of the screw conveyor for excavated soil and soil discharge connected to the bulk head is When a rotating body arranged concentrically with this is continuously rotated, the through holes provided in the rotating body and the soil removal holes provided in the corresponding parts of the screw trough alternately overlap. , there is a discrepancy, and the excavated soil in the screw conveyor is repeatedly discharged and compacted.

In addition, the rotating body rotates in an open section of the soil discharge hole where the through hole and the soil discharge hole of the screw trough overlap, and in a closed section of the soil discharge hole where the positions of the through hole and the soil discharge hole are inconsistent. By setting the rotational speed of the rotary body to an arbitrary speed, the ratio between the opening time and the closing time of the earth removal hole per rotation of the rotary body can be freely adjusted, and the compaction degree of the excavated soil can be adjusted. It's watery.

Further, the rotary body is stopped at a position where the through hole thereof and the soil discharge hole of the screw trough partially overlap, and the soil discharge gate opening ratio is adjusted to discharge the soil, as in the conventional shield excavator. Can be soiled.

(Example) The present invention will be described below with reference to the illustrated embodiments.

1 is a shield body, 2 is a cutter, 3 is a cutter driving motor, 4 is an earth and sand seal for the cutter, 5 is a bulk head, and the soil excavated by the cutter 2 is fed through a pipe 6 together with the viscous imparting material injected through the pipe 6. While being kneaded in a chamber 7 defined in front by the bulkhead 5, it is transported rearward by a screw blade 9 driven by a screw drive motor 8 in a screw conveyor connected to the bulkhead 5. .

The screw trough in the screw conveyor is composed of a front screw trough 10 connected to the bulkhead 5, an intermediate screw trough 11 connected to the rear end, and a rear screw trough 12 connected to the rear end. ing.

An earth pressure gauge 22 is disposed in the front screw trough 10, and a cylindrical rotating body having a through hole 13a is provided concentrically with the inner peripheral sides of the intermediate and rear screw troughs 11 and 12. 13 is rotatably mounted. A large-diameter gear 14 is attached to the outer peripheral surface of the rotating body 13, and the screw trough 12
It meshes with a small diameter gear 16 fixed to the drive shaft of a rotating body drive motor 15 mounted on the motor 15.
The rotating body 13 is driven and rotated by. In the figure, 17 is a bearing that rotatably supports the rotating body 13 on the screw trough 12, and 18 is an earth and sand seal for the rotating body.

Further, in the intermediate screw trough 11, a soil removal hole 11a is provided at a portion corresponding to the through hole 13a of the rotating body 13.
is drilled. 19 in the figure is the earth and sand seal for the soil removal hole.

In addition, 20 in the figure is a proximity switch mounted on the intermediate screw trough 11, and 21 is a shield jack.

Since the illustrated embodiment is configured as described above, when the rotary body 13 is driven and rotated, the through hole 13a of the rotary body 13 and the soil discharge hole 11a of the screw trough 11 do not overlap with each other and the soil discharge hole is blocked. In section B, the excavated earth and sand in the screw conveyor is not discharged, but is consolidated by the rotation of the screw blades 9. Further, in the soil discharge hole open section A where the through hole 13a and the soil discharge hole 11a overlap, the excavated soil in the screw conveyor is discharged.

Therefore, if the rotating body 13 is allowed to rotate continuously, the excavated soil is repeatedly compacted and discharged.

Next, the proximity switch 20 attached to the intermediate screw trough 11 detects the soil removal hole open section A and the soil discharge hole closed section B, and adjusts the rotational speed of the rotating body 13 arbitrarily in each section A and B. If the speed can be set to , the ratio between the opening time and the closing time of the soil discharge hole 11a per rotation of the rotating body 13 can be freely adjusted.

For example, if you want to increase the consolidation density of excavated soil, the soil discharge hole opening section A per one rotation of the rotor 13
What is necessary is to increase the rotational speed of the soil discharge hole blockage section B and to slow down the rotational speed of the soil discharge hole blockage section B. Furthermore, the screw trough 1
The rotation speed of the soil discharge hole open section A and the rotation speed of the soil discharge hole closed section B may be changed automatically in conjunction with the earth pressure detected by the soil pressure gauge 22 disposed at 0. .

Note that, as described above, the rotating body 13 is rotated as shown in FIG. 3 without continuously rotating the rotating body 13.
If the through hole 13a and the soil discharge hole 11a of the screw trough 11 are stopped at a position where they partially overlap, by adjusting the positional relationship between the through hole 13a and the soil discharge hole 11a, It can also remove earth while adjusting the gate opening ratio like a conventional shield excavator.

Note that FIG. 4 is a longitudinal sectional view showing the state of the rotating body 13 in the closed section B of the earth removal hole 11a.

Furthermore, the present invention is also applicable to a closed type shield tunneling machine having a ribbon screw conveyor.

(Effects of the invention) As described above, in the closed type shield excavator according to the invention, the earth removal gate portion of the earth removal screw conveyor connected to the bulkhead has a through hole on the inner peripheral side of the screw trough. A cylindrical rotating body that rotates at a variable speed is arranged concentrically with the trough, and a soil removal hole is provided in the trough at a position corresponding to the through hole. By overlapping or making the through holes of the rotating body and the soil discharge holes of the trough overlap or conflict with each other, the consolidation and discharge of the excavated soil in the screw conveyor can be reliably repeated automatically even under high water pressure. At this time, by adjusting the rotational speed of the rotating body, the compaction degree of the excavated earth and sand is adjusted, and eruption is reliably prevented.

In addition, the rotating body is not rotated continuously, but is stopped at a position where its through hole and the earth removal hole of the screw trough partially overlap, so that it can be operated in the same way as a conventional shield excavator. The soil can be removed by adjusting the opening ratio of the soil removal hole, and the excavated earth pressure density can be adjusted.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional side view showing an embodiment of the enclosed shield excavator according to the present invention, Fig. 2 is a longitudinal sectional view showing the earth removal gate section of the screw conveyor, and Figs. 3 and 4 are FIG. 5 is a vertical cross-sectional view showing a partially opened state of the soil discharge hole by the rotating body in the soil discharge gate portion, and a closed state of the soil discharge hole, respectively. FIG. 5 is a vertical cross-sectional side view of a conventional closed type shield excavator. . 1...Shield body, 5...Bulk head, 1
0, 11, 12...screw trough, 11a...
...Earth removal hole, 13...Rotating body, 13a...Through hole.

Claims (1)

[Scope of utility model registration request] A cylindrical rotating body having a through hole and rotating at a variable speed is placed concentrically with the trough on the inner circumferential side of the screw trough in the soil discharge gate portion of the screw conveyor for excavated soil discharge connected to the bulkhead. 1. A closed type shield excavator, characterized in that the screw trough is provided with an earth removal hole at a position corresponding to the through hole of the rotor in the screw trough.