JPS6124633Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a shield excavator, and in particular to a screw that discharges excavated earth and sand when excavating a mountain face using a cutter provided at the front of the excavator to the rear tunnel side. Concerning conveyors. Conventional shield tunneling machines have various means for discharging excavated soil, such as a screw conveyor, a belt conveyor, or a sludge pipe method, depending on the work conditions such as the geology of the ground where the tunnel is to be excavated. be. Among these, the screw conveyor is constructed so that its outside is surrounded by a cylindrical body along the transport direction to maintain watertightness, so excavated soil or mud containing groundwater can be transported inside the screw conveyor. It has the advantage that it can be used as part of a water-stop wall that prevents collapse of the face by compaction, and is widely used. The conventional screw conveyor is shown in Figure 1.
A shaft 9 provided along the longitudinal direction inside the excavator 1
, a flight 10 for transporting earth and sand spirally provided along its axis 9, and a cylindrical body 11 covering these along its longitudinal direction. Further, its tip penetrates into the cutter chamber 3 of the excavator, and a driving means 20 is provided at the rear of the shaft (on the excavated tunnel Z side on the right side of the drawing) behind the axis, so that the shaft 9 and the flight 10 can rotate freely. Supported. Therefore, the excavated soil taken into the cutter chamber 3 is transferred rearward along the axis 9, and is transferred to the constant volume discharge device connected to the soil discharge port 12 provided on the lower surface of the cylindrical body 11, that is, in the radial direction. The soil is discharged and transferred via a rotary feeder 14 to a belt conveyor 19 of an earth and sand transport device in the tunnel Z. Further, an opening adjusting plate 1 that can be opened and closed to adjust the opening of the soil discharge port 12 provided on the screw conveyor.
8 may be provided. In the figure, 2 is a cutter face plate, 4 and 5 are cutter drive mechanisms, 6 is a shield jack, and 8 is a segment.

However, the conventional rotary feeder 14
Since the screw conveyor is vertically mounted facing downward and radially outward of the cylindrical body 11 surrounding the screw conveyor, the overall height becomes large. In addition, a belt conveyor 19 is installed below the rotary feeder 14 and is used in combination with the belt conveyor 19, so that the hollow space inside the excavator 1 is widely occupied in the height direction, so that the excavation This may obstruct the passage of workers inside the machine 1, especially if foreign matter such as gravel gets mixed into the excavated soil, or if the geology changes and the clay is deposited near the soil discharge port 12 or rotary leaf feeder 1.
4. If the dirt adheres to the soil and causes poor soil removal, check and
The rotary leaf feeder 14 must be removed from the soil discharge port 12 for processing. In order to secure space for this removal work, the belt conveyor 19 installed below the soil discharge port 12 had to be temporarily removed to the rear of the tunnel Z. After that, soil discharge port 1
The rotary leaf feeder 14 was removed after all the bolts connecting the flange 13 on the second side and the flange 15 on the rotary leaf feeder 14 side were removed. Their removal, removal, and restoration work required a lot of manpower and time, and were a major hindrance to tunnel excavation work.

On the other hand, the scope of application of shield tunneling machines has been further expanded due to their excellent workability, and for example, small diameter tunneling machines have been adopted for laying sewer pipes, but due to their small diameter, the hollow space inside the tunneling machine is limited. As the space becomes narrower, in order to mount the rotary leaf feeder vertically below the screw conveyor as in the past, we are forced to make inefficient designs and arrangements such as reducing the diameter and downsizing of each of these components. There were drawbacks such as:

The present invention has been devised to effectively solve the above-mentioned problems. The purpose of this invention is to form a soil discharge port at the rear end of the axis of the screw conveyor, and to make it possible to install a rotary leaf feeder in the soil discharge port so that it can be opened and closed. It is an object of the present invention to provide a screw conveyor device for a shield excavator, which can be made compact in size, reduce the overall diameter of the excavator, and make effective use of hollow space.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. As shown in FIG. 2, the feature of the present invention is that the axial end of the screw conveyor on the discharge side is opened to form a soil discharge port 12.
2, the rotary feeder 14 is attached to the rotary feeder 14 so as to be freely deployable. As shown, screw shaft 2
1 is composed of a shaft 9 and a flight 10 spirally provided along the axial direction. This screw shaft 21 is provided with a cylindrical body 11 that surrounds and covers the screw shaft 21 along its axial direction. Although not shown, the carry-in end of the screw shaft 21 is connected to the cutter chamber as in the conventional example. As mentioned above, the discharging end of the screw shaft 21 has the discharging port 1 which is cut in the axial direction from the end of the cylindrical body 11.
2 is formed. An outer cylindrical body 23 having a flange portion 22 extending radially outward is attached to the soil discharge port 12 cut out in this way, and this outer cylinder 23 defines an opening of the soil discharge port 12. It turns out. As shown in FIGS. 2 and 3, a rotary leaf feeder 14 is attached to the soil discharge port 12 so as to be freely deployable. Specifically, the flange portion 22 of the outer cylinder body 23 and the flange portion 1 of the rotary feeder 14
6 are pivotally connected by pin 24, and pin 2
The rotary feeder 14 is configured to expand and move upward using the rotary feeder 4 as a fulcrum to open the soil discharge port 12. Further, a jack 25 is spanned between the outer cylindrical body 23 and the rotary leaf feeder 14, and the rotary leaf feeder 14 is expanded and moved by the expansion and contraction movement of the jack 25. Next, a drive ring 26 is provided between the cylindrical body 11 and the outer cylindrical body 23. This drive ring 26 is for rotationally driving the screw shaft 21, and the peripheral edge of the flight 10 is fixed to the inner wall of the drive ring 26. The drive ring 26 is supported such that one end thereof is in sliding contact with the outer wall 28 of the mounting flange 31 and the other end is in sliding contact with the inner wall 29 of the outer cylinder body 23. Seal bearings 30 are provided at these sliding contact portions. A mounting flange 31 that stands up in the radial direction is provided on the outer wall 28 of the cylindrical body 11.
is provided, and a drive motor 32 is supported on this mounting flange 31. This drive motor 32 is provided with a driving gear 33 . The driving gear 33 is attached to the drive ring 26 and meshes with a driven gear 34 surrounding the cylinder 11. Next, the operation of the present invention will be described. When the screw shaft 21 of the screw conveyor is rotationally driven by the drive motor 32 via the drive ring 26, the excavated soil is carried out from the cutter chamber (not shown) along the screw shaft 21 to the soil discharge port 12, and the rotary leaf feeder 14 will be transferred to. The earth and sand transferred to the rotary feeder 14 is weighed by a rotary partition plate 15 provided therein, and is then transferred to a belt conveyor 19 provided outside with the inside of the screw conveyor sealed. In particular, by arranging the screw conveyor and rotary feeder 14 side by side in the axial direction of the excavator 1, the height can be reduced to about 1/2 of the conventional height, and therefore the excavation can be carried out accordingly. Since the area occupied by the hollow space inside the machine 1 can also be reduced, it is possible to appropriately arrange each member without reducing excavation efficiency even in a small-diameter excavator that is subject to space constraints. Next, when foreign matter such as gravel gets mixed into the excavated soil, or when clay soil adheres to the vicinity of the soil discharge port 12 due to geological changes and causes soil discharge failure, the rotary leaf feeder 14 should be moved to the jack 25. By driving and moving the rotary leaf feeder upwardly, the soil discharge port 12 and the rotary leaf feeder 14 can be separated as shown in FIG. 3, and the vicinity of the soil discharge port 12 can be brought into an open state. After the inspection and processing are completed, when the jack 25 is driven and the rotary leaf feeder 14 is rotated and lowered about the pin 24, the flange portion 22 of the outer cylinder body 23 and the flange portion 16 of the rotary leaf feeder 14 are flush with each other. Upon contact, the rotary feeder returns to its sealed state in the soil discharge port 12.

As a result of the above, even if a soil discharge failure occurs during tunnel excavation, the soil discharge port 12 can be easily opened and restored, and inspection and treatment can be carried out quickly. The condition can be prevented. Note that sealing materials and clamps are appropriately attached to the flanges 16 and 22 to maintain the watertightness of the portions, and an opening adjustment plate is attached to the flanges 16 and 22 so that they can be inserted and removed to prevent more soil than the planned amount from entering the rotary leaf feeder 14. The inflow may be adjusted or stopped. In addition, if the geology of the ground changes to clayey soil and it becomes suitable to deploy the rotary leaf feeder 14 and directly discharge soil from the soil discharge port 12, prevent soil from flowing into the rotary leaf feeder 14. By attaching a closing plate to the flange 16 to close it and directly discharge the soil, and by adjusting the amount of expansion of the rotary leaf feeder 14, the opening amount of the soil discharge port 12, that is, the amount of soil to be discharged, can be adjusted to match the geological conditions. It is possible to set the required amount. FIG. 4 shows another embodiment, in which a joint pipe 36 is interposed between the soil discharge port 12 and the rotary leaf feeder 14, and the rotary leaf feeder 14 is tilted slightly downward to remove the soil under its own weight. This makes it easier to drop and discharge. In this case, the rotary feeder 14 is supported by the flange portion 37 of the joint main pipe 36 via the pin 24.
Further, although not shown, the jack 25 may be installed laterally or downwardly to rotate the rotary leaf feeder 14 laterally or downwardly. Note that when the rotary feeder 14 is lightweight, the jack 25 is omitted.

According to the present invention, the following excellent effects can be obtained.

(1) A rotary feeder can be installed in series on the axis of the screw conveyor, and its size in the height direction can be reduced, making it suitable for the excavation capacity of small-diameter excavators with small hollow spaces. A screw conveyor can be installed to make tunnel excavation work more efficient.

(2) Since the rotary feeder is supported in a deployable manner at the unloading end on the axis of the screw conveyor, it is easy to access the soil discharge port when foreign matter gets mixed in with the excavated soil and soil discharge fails. Since the area can be opened, inspection, treatment, and restoration can be carried out quickly.

(3) When the geology of the ground being excavated changes to clayey soil and it becomes suitable to remove the soil using only the screw conveyor, the soil discharge port can be opened by simply deploying and moving the rotary feeder. Moreover, the amount of soil discharged can be adjusted to the required amount, and the operation can be carried out easily and in a short time.

[Brief explanation of the drawing]

Figure 1 is a side sectional view of a conventional shield tunneling machine.
FIG. 2 is a side sectional view of the device according to the present invention, FIG. 3 is a partially enlarged view thereof, and FIG. 4 is a side sectional view of another embodiment of the present invention. In the figure, 1 is a shield excavator, 7 is a spacer that transmits the thrust of the shield jack 6 to the segment 8,
12 is a soil discharge port, 14 is a rotary feeder, 24
is a pin.

Claims (1)

[Scope of utility model registration request] A screw conveyor device for a shield tunneling machine, characterized in that in the soil discharge means using a screw conveyor for discharging excavated soil rearward from the cutter chamber of the shield tunneling machine, a soil discharge port is provided at the axial end of the screw conveyor on the discharge side, a rotary pulley is pivotally supported at the soil discharge port for discharging a fixed amount of excavated soil transported by the screw conveyor, and the rotary pulley is supported so as to be freely deployable at the soil discharge port.