JPH0354238Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of a continuous earth and sand discharge device provided at the earth discharge port of a screw conveyor of a shield excavator.

[Prior Art] Generally, a shield excavator excavates a face using a rotary cutter provided at the front end of a shield frame, and excavates the earth and sand taken into a cutter chamber partitioned by the cutter and a bulkhead. It is equipped with a screw conveyor for carrying out the excavation direction to the rear. As shown in FIGS. 3 and 4, a rotary leaf feeder d is attached to the soil discharge port b of the screw conveyor a via a slide gate c that opens and closes the soil discharge port b. Furthermore, Fig. 3 shows a shaft-driven screw conveyor with a motor f connected to the shaft end of the screw e and a soil discharge port b in the radial direction, and Fig. 4 shows a motor h connected to the outer periphery of the screw g. This figure shows an outer cylinder drive type screw conveyor having a soil discharge port b in the axial direction.

The Rotary Feeder d is a fixed volume continuous earth and sand discharge device, and each chamber partitioned by internal rotating blades i is sealed, so it has excellent water-stopping properties, but on the other hand, it may cause poor soil ejection due to the adhesion of earth and sand, and gravel may get stuck. It has a weakness that causes the inability to rotate.

[Problem that the invention aims to solve] For this reason, in the conventional method, when soil discharge failure or rotation failure occurs, it is difficult to remove soil and gravel as it is, so rotary leaf feeder d is moved from soil discharge port b. It had to be removed each time, and this work had to be done in a narrow space and with a heavy object, making the work difficult and dangerous. Further, when the rotary feeder d was removed, it was difficult to continue the earth removal work because the water-stopping performance was poor with only one slide gate c. Furthermore, if clayey soil appeared, it was necessary to remove the rotary leaf feeder d.

Note that measures such as increasing the diameter of the blades of the rotary feeder d have been taken to prevent gravel from becoming entangled, but no fundamental solution has been reached.

Therefore, the present invention was devised to solve the above-mentioned problems of the conventional technology.The purpose of this invention is to be able to remove adhered earth and sand and entangled gravel without removing the rotary feeder, and to avoid the appearance of cohesive soil. To provide a continuous soil discharge device that can discharge soil by opening a second slide gate without using a rotary feeder in some cases.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides an earth discharge port opened in the axial direction of the screw conveyor that carries earth and sand from the cutter chamber of the shield excavator to the rear in the excavation direction. A soil removal passage having an opening opened in the axial direction through the first slide gate is provided, a second slide gate is provided in the axial opening of the earth removal passage, and the first slide gate and the earth removal passage are provided with a second slide gate. A rotary feeder is provided at the bottom of the soil discharge passageway between the second slide gate and the second slide gate to discharge soil in the direction of gravity.

[Operation] The first slide gate is opened, the second slide gate is closed, and the rotary feeder is driven to quantitatively and continuously discharge earth and sand. If the rotary feeder fails to eject soil or is unable to rotate, all you have to do is close the first slide gate, open the second slide gate, and remove the adhered soil and gravel from the rotary feeder. No need to remove feeder. In addition, if clayey soil appears, stop driving the rotary leaf feeder,
Open the second slide gate and discharge the earth and sand from there. Since it has double gates, it has good water-stop properties.

[Example] An example of the present invention will be described below in detail based on the accompanying drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a cylindrical shield frame of a shield tunneling machine, and a bulkhead 2 is provided at the front end of the shield frame.
A cutter 3 for excavating the face is rotatably provided. A cutter chamber 4 for taking in excavated earth and sand is defined between the cutter 3 and the bulkhead 2, and the bulkhead 2 has a cutter chamber 4.
A screw conveyor 5 is attached to carry out the earth and sand inside to the rear in the excavation direction. This screw conveyor 5 is of a so-called outer cylinder drive type in which a screw 6 is driven by a motor 7 on its outer periphery and has a soil discharge port 8 at the rear in the axial direction.

The soil discharge port 8 of the screw conveyor 5 is provided with a soil discharge passage 10 having an opening 9 opened in the axial direction, and a rotary leaf feeder 11 is attached to and detached from the bottom of the soil discharge passage 10 by means of a flange joint 12. Can be installed freely. A supply port 14 communicating with the inlet 13 of the rotary feeder 11 is formed at the bottom of the earth removal passage 10 . The rotary feeder 11 is configured to quantitatively discharge earth and sand introduced from an inlet 13 from an outlet 17 by driving a rotary blade 16 with a motor 15. An outlet 17 of the rotary feeder 11 is arranged facing onto a belt conveyor 18.

The soil discharge port 8 of the screw conveyor 5 has a first
A slide gate 19 is provided at the opening 9 of the soil discharge passage 10, and a second slide gate 20 is provided so as to be slidable in the vertical direction, and the first slide gate 19 is provided on both sides of the soil discharge port 8. The second slide gate 20 is opened and closed by a pair of cylinders 21 and a cylinder 23 attached to a frame 22 of the earth removal passage 10, respectively.

Note that 24 is a device for assembling the segments 25;
26 is a shield jacket.

In the above configuration, the first slide gate 1
When the rotary leaf feeder 11 is driven by opening the second slide gate 20 and closing the second slide gate 20, the soil transported from the cutter chamber 4 by the screw conveyor 5 is transferred from the soil discharge port 8 to the soil discharge passage 10 and the rotary leaf feeder 11. It is continuously discharged through the feeder 11 through its outlet 17.

In such a state, if dirt adheres to the rotary blades 16 of the rotary leaf feeder 11 and causes soil removal failure, or if gravel is caught and the rotary blades 16 become unable to rotate, the motor 15 of the rotary leaf feeder 11 is stopped. Then, the first slide gate 19 is closed, the second slide gate 20 is opened, and the hand is inserted into the rotary feeder 11 through the opening 9 to remove the attached dirt and gravel. In this way, the work of removing adhered soil and gravel can be carried out safely and easily without removing the rotary feeder 11.

On the other hand, the rotary blade 16 of the rotary feeder 11
If clayey soil that easily adheres to the rotary feeder 11 appears, the drive of the rotary leaf feeder 11 is stopped and the
Open the slide gates 19 and 20 and enter the soil removal path 1.
It is sufficient to discharge the earth and sand from the opening 9 at 0. In this case as well, since it has a so-called double gate structure, it has excellent water-stopping properties and is safe in terms of construction.

In addition, when the rotary feeder 11 is removed for maintenance etc., the supply port 14 of the earth removal passage 10 is closed with a blind plate, and the feeder 11 is removed through the first and second slide gates 19, 20 as described above. Sediment may also be discharged.

[Effects of the invention] In summary, the present invention provides the following excellent effects.

(1) When the second slide gate is opened, the inside of the rotary leaf feeder is opened, so dirt may adhere to the rotating blades of the rotary leaf feeder, or gravel may become trapped, resulting in poor soil ejection or failure to rotate. In such cases, attached soil and gravel can be safely and easily removed without removing the rotary feeder. Therefore, there is no need to increase the blade diameter of the rotary leaf feeder in order to prevent debris from getting caught in the rotary leaf feeder, so it is possible to install a rotary leaf feeder with a relatively small diameter.

(2) Cohesive soil, etc. can be discharged without using a rotary feeder by opening the second slide gate, and the double gate structure has good water-stopping properties and is safe for construction.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, FIG. 2 is a view taken along the line A--A in FIG. 1, and FIGS. 3 and 4 are longitudinal sectional views showing a conventional device, respectively. In the figure, 4 is a cutter room, 5 is a screw conveyor, 8 is a soil discharge port, 9 is an opening, 10 is a soil discharge path,
19 is a first slide gate, and 20 is a second slide gate.

Claims (1)

[Scope of utility model registration request] An earth discharge passageway having an opening opened in the axial direction through a first slide gate to the earth discharge port opened in the axial direction of the screw conveyor that carries earth and sand from the cutter chamber of the shield excavator to the rear in the excavation direction. A second slide gate is provided at the axial opening of the earth removal passage, and earth and sand are removed from this in the direction of gravity at the bottom of the earth removal passage between the first slide gate and the second slide gate. A continuous soil discharge device characterized by being equipped with a rotary leaf feeder for discharge.