JP2020084672A - How to extend a screw conveyor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of extending a screw conveyor device in which the position of the screw conveyor device with respect to a conveyor device can be easily adjusted by making the screw conveyor device longer than that during initial excavation.
A method for extending a screw conveyor device is a method for extending a screw conveyor device that is provided in a shield machine and discharges excavated soil, and that extends the screw conveyor device after initial excavation and before main excavation. It is equipped with an extension process.
[Selection diagram] Fig. 7

Description

The present invention relates to a method for extending a screw conveyor device.

Conventionally, in underground propulsion work, a shield excavator is placed in the starting shaft, and the rock from the starting shaft to the reaching shaft is excavated by the shield excavator while sequentially connecting segment rings composed of multiple segments. (For example, refer to Patent Document 1). The excavated earth and sand is discharged backward by a screw conveyor device, and the discharged excavated earth and sand is conveyed by a conveyor device such as a belt conveyor.

JP, 2003-214085, A

However, since the starting shaft where the shield machine is first arranged is often narrow, the screw conveyor device of the shield machine arranged in the starting shaft has a short shape. Even when the initial excavation is completed and the main excavation is performed, the short screw conveyor device is used. Therefore, it may be difficult to adjust the position of the screw conveyor device with respect to a conveyor device such as a belt conveyor provided on the downstream side of the screw conveyor device.

Therefore, an object of the present invention is to provide an extension method of a screw conveyor device in which the position of the screw conveyor device with respect to the conveyor device can be easily adjusted by making the screw conveyor device longer than in the initial advance.

The extension method of the screw conveyor device of the present invention is an extension method of the screw conveyor device which is provided in a shield machine and discharges excavated soil, and extends the screw conveyor device after initial excavation and before main excavation. It is equipped with an extension process.

According to the present invention, after the initial excavation and before the main excavation, that is, after a certain amount of space is secured, by extending the screw conveyor device in the extension process, the length of the screw conveyor device is longer than that during the initial excavation. It can be elongated. This makes it easier to adjust the position of the screw conveyor device with respect to the conveyor device such as a belt conveyor provided on the downstream side of the screw conveyor device.

In the above invention, in the extending step, a gate device removing step of removing a gate device provided at a downstream end of a long first casing provided in the screw conveyor device, the first casing and the gate device. And a drive device removing step for removing a drive device that rotationally drives the spiral-shaped first auger that is rotationally driven in the first casing, and a second auger upstream from a downstream end of the first auger. An auger connecting step of connecting ends, a casing connecting step of connecting an upstream end of a second casing containing the second auger to a downstream end of the first casing, and a drive device connected to a downstream end of the second auger. It is preferable to include a drive device connecting step of connecting the gate device and a gate device connecting step of connecting the gate device to the downstream side of the drive device.

According to the above configuration, by connecting the second auger to the first auger and connecting the second casing to the first casing, the length of the auger and the casing, that is, the length of the screw conveyor device is set to be shorter than that at the time of initial excavation. It can be elongated.

In the above invention, in the auger connecting step, a plurality of rod-shaped guide bolts are provided at an upstream end of the second casing, and the second auger is slid along the guide bolts to come into contact with the first auger. It is preferable to connect the downstream end of the first auger and the upstream end of the second auger.

According to the above configuration, it becomes easy to connect the second auger to the first auger.

In the above invention, in the casing connecting step, the second casing is slid along the guide bolt to be brought into contact with the downstream end of the first casing, and in this state, the downstream end of the first casing and the second casing are connected. Is preferably connected to the upstream end of the.

According to the above configuration, it becomes easy to connect the second casing to the first casing.

In the above invention, it is preferable that the extending step further includes a welding step of welding the first casing and the first auger before the drive device removing step.

According to the above configuration, the rotation of the first auger with respect to the first casing can be prevented (rotation stop).

In the above invention, it is preferable that the extending step further includes a welded portion removing step of removing a welded portion between the first casing and the first auger after the auger connecting step.

According to the above configuration, the first auger can be rotated by removing the welded portion.

In the above invention, the shield machine has a rear working deck provided at the time of initial excavation, and the extending step further includes a deck attaching step of attaching another rear working deck to the rear working deck before the auger connecting step. It is preferable to include.

According to the above configuration, since the other rear work deck is attached before the auger connecting step, the work of the auger connecting step is facilitated.

According to the present invention, it is possible to provide a method for extending a screw conveyor device in which the position of the screw conveyor device with respect to the conveyor device can be easily adjusted by making the screw conveyor device longer than that at the time of initial excavation.

It is sectional drawing which shows the state of the start stage of the extension method of the screw conveyor apparatus which concerns on one Embodiment of this invention. It is a figure showing the state where the slide gate after removal is being moved by the lifting device. It is a figure showing the state where the upper part of the 1st casing after removal is being moved by the lifting device. It is a figure showing the state where the drive device after removal is being moved by the lifting device. It is a figure showing the state where another rear work deck is conveyed by the lifting device. It is a figure which shows the state in which the guide bolt was attached to the 2nd casing conveyed by the lifting device, and the state before the 2nd auger is slid toward the 1st auger via the guide bolt, and is connected. It is a figure which shows the state after a 2nd casing was slid toward the 1st casing via a guide bolt, and was connected. It is a figure showing the state where the turnbuckle removed in the previous process was attached to the bracket of the 2nd casing. It is a figure showing the state where the lower part of a casing was attached to the downstream end of the 2nd casing. It is a figure showing the state where the drive was connected with the 2nd auger. It is a figure showing the state where the casing upper part was attached to the downstream end of the 2nd casing, and the slide gate and the rotary gate were attached. It is a flowchart which shows the extension process of a screw conveyor apparatus.

Hereinafter, a method for extending a screw conveyor device according to an embodiment of the present invention will be described with reference to the drawings. The extension method of the screw conveyor device described below is only one embodiment of the present invention. Therefore, the present invention is not limited to the following embodiments, and additions, deletions and modifications can be made without departing from the spirit of the present invention.

FIG. 1 shows a state in which the shield machine 1 is arranged in the starting shaft 200 during the initial excavation. The shield machine 1 is a mud-pressure type shield machine that excavates by adding a mud additive to make the excavated soil mud and applies mud pressure to the face. The shield machine 1 is a cutter bit type, but may be a roller cutter type.

As shown in FIG. 1, in the underground propulsion work, the shield machine 1 is arranged in the starting shaft 200 during the initial excavation. Then, the shield machine 1 excavates the natural ground, and sequentially connects the segment rings 100 (see FIG. 2) to the reaching shaft (not shown).

The shield machine 1 of the present embodiment is a center-break type shield machine, and includes a cutter head 2 and a machine body 3 that rotatably supports the cutter head 2. The excavator main body 3 includes a front body 4 and a rear body 5. The front body 4 and the rear body 5 are connected by a middle bent portion 6. A bulkhead 8 that forms a cutter chamber 13 together with the cutterhead 2 is provided at the front portion of the front body 4. The cutter head 2 includes a cutter head flange that is an annular plate, and the cutter drum 7 is attached to the back surface of the cutter head flange. The cutter drum 7 is rotatably supported by the excavator body 3.

The center-folded portion 6 can be center-folded by the extension and contraction operations of the center-folded jack 9. For example, by making the extension amount of the left middle folding jack 9 larger than the extension amount of the right middle folding jack 9 in plan view, the excavator body 3 can be bent rightward in the middle. For example, the excavator body 3 can be folded in the left direction.

An agitator 42 is provided in the cutter chamber 13. The agitator 42 is provided on the front surface of the bulkhead 8. The agitator 42 stirs the excavated earth and sand in the cutter chamber 13.

A plurality of shield jacks 11 are provided on the front part of the rear body 5 of the excavator body 3. These shield jacks 11 receive a reaction force by extending the jack spreader toward the existing segment ring 100. In such a configuration, by extending the jack spreader while rotating the cutter head 2, the excavator body 3 can be advanced while excavating the natural ground.

A long screw conveyor device 14 for discharging the earth and sand excavated by the cutter head 2 to the rear of the excavator body 3 is fixed to the lower portion of the bulkhead 8. The screw conveyor device 14 is arranged in the radial center of the excavator body 3 in a plan view. Further, the screw conveyor device 14 extends obliquely to the upper right from the lower portion of the bulkhead 8 in a side view (a side view of FIG. 1 ). The screw conveyor device 14 is in a suspended state because a turnbuckle (supporting member) 41 is connected to a bracket provided near the downstream end of the screw conveyor device 14.

The screw conveyor device 14 includes a cylindrical first casing 23 and a long first auger 30 (FIG. 3) provided at the downstream end of the first casing 23 and arranged in the first casing 23. ), a drive device 22 that rotationally drives the first auger 30, and a slide gate 20 and a rotary gate 21 that are provided on the downstream side of the drive device 22. The slide gate 20 and the rotary gate 21 correspond to a gate device. The first auger 30 is rotatably arranged in the first casing 23. The slide gate 20 is a gate that pulls up the door body, and by lifting the door body, the earth and sand is sent to the rotary gate 21 on the downstream side. The rotary gate 21 has a rotatable impeller-shaped gate, and rotates the gate to discharge the earth and sand to the outside.

The skeleton 15 provided on the rear body 5 of the excavator body 3 is provided with an erector device 70 that rotatably mounts the segment ring 100 at a predetermined position on the wall surface of the tunnel. Specifically, the erector device 70 is attached to the swivel ring 10 supported by the swivel ring 10 so as to be able to swivel along the rear torso 5 inside the rear torso 5, and transports the segment to a predetermined position on the tunnel wall surface. It has a moving part 16 and a gripping part 17 which is attached to the tip of the sliding part 16 and grips the segment.

Further, the excavator main body 3 is provided with a shape retaining device 43 for retaining the shape of the segment ring 100. The shape retaining device 43 includes an actuator 43a and a pressing member 43b that is radially moved by the actuator 43a and presses the segment ring 100 from the inside.

Further, the excavator body 3 is provided with a rear working deck 50 including a counterweight frame 51 arranged on the rear side. The front part of the rear work deck 50 is fixed to the frame 15 by welding. As a result, the rear work deck 50 is provided in a cantilevered state.

In the present embodiment, after the initial excavation is performed by the shield excavator 1 having the above-described configuration during the initial excavation, the screw conveyor device 14 is extended in the extension step before the main excavation is performed. Hereinafter, a method for extending the screw conveyor device 14 will be described in detail.

As shown in FIG. 2, the segment rings 100 are sequentially connected by the initial excavation by the shield machine 1. Then, after the initial excavation is completed and before the main excavation is performed, first, earth and sand are discharged from an inspection port provided at the downstream end of the first casing 23 of the screw conveyor device 14, and then, inside the slide gate 20 and the rotary gate 21. The inside is cleaned.

Subsequently, after the actuator 43a, which is a part of the shape retaining device 43, is disassembled, the guide rail 60 is provided in the excavator body 3 and the segment ring 100 in parallel with the axial direction of the excavator body 3. .. The guide rail 60 is provided with a pair of lifting devices 61 configured to be movable in the length direction of the guide rail 60 and configured to lift and transport an object.

Next, the counter weight (not shown) of the rear work deck 50 is removed and moved by the lifting device 61, and then the rotary gate 21 and the slide gate 20 are removed and moved by the lifting device 61. Note that FIG. 2 shows the removed slide gate 20 being moved by the lifting device 61.

Next, after a part of the rear work deck 50 and the turnbuckle 41 are removed, as shown in FIG. 3, the upper portion 24 of the first casing 23 immediately upstream of the drive device 22 is removed and the lifting device 61 is used. Be moved.

Next, the first auger 30 and the first casing 23 are welded. By welding, the rotation of the first auger 30 with respect to the first casing 23 can be prevented (rotation stop). Thereafter, as shown in FIG. 4, the drive device 22 is removed and moved by the lifting device 61.

Subsequently, after the counterweight frame 51 is removed, as shown in FIG. 5, the lifting device 61 moves another rear work deck 52 toward the rear work deck 50 and attaches it to the rear work deck 50. Further, the lower portion 25 corresponding to the upper portion 24 (see FIG. 3) of the first casing 23 is removed and moved by the lifting device 61.

Next, as shown in FIG. 6, after another rear working deck 53 is mounted on the rear working deck 52, the second casing 26 (extension) in which the second auger 31 (extension auger) is arranged inside is formed. The casing (minute portion) is transported by the lifting device 61. A plurality of rod-shaped guide bolts 44 are attached to the upstream end of the second casing 26. Then, the guide bolt 44 is brought into contact with the downstream end of the first casing 23, and in this state, the second auger 31 is slid along the guide bolt 44 and connected to the downstream end of the first auger 30. Then, the downstream end of the first auger 30 and the upstream end of the second auger 31 are fixed by welding. Note that FIG. 6 shows a state before the second auger is slid toward the first auger and connected.

Subsequently, as shown in FIG. 7, the second casing 26 is slid toward the first casing 23 along the guide bolts 44 to be brought into contact with the downstream end of the first casing 23. In this state, the first casing 23 And the upstream end of the second casing 26 are connected and fixed by, for example, bolts. After that, the above-mentioned welded portion for the detent is removed. In the state where the second casing 26 is connected to the first casing 23, the downstream side portion of the second auger 31 projects from the second casing 31.

Next, as shown in FIG. 8, one end of the turnbuckle 41 is connected to a bracket provided on the second casing 26. The other end of the turnbuckle 41 is connected to a support base that supports the center folding jack 9. Further, the lifting device 61 moves another rear work deck 54 toward the rear work deck 50 and mounts it on the rear work deck 53.

Next, as shown in FIG. 9, after the casing lower portion 27 for covering the portion of the second auger 31 protruding from the second casing 26 is transported by the lifting device 61, the casing lower portion 27 is moved to the first position. 2 is attached to the downstream end of the casing 26.

Subsequently, as shown in FIG. 10, after the drive device 22 is transported by the lifting device 61 and the drive device 22 is connected to the second auger 31, the drive device 22 and the casing lower portion 27 are, for example, The drive device 22 and the second auger 31 are fixed by bolts and welded.

Then, as shown in FIG. 11, after the casing upper part 28 is attached to the downstream end of the second casing 26 and the casing lower part 27, the slide gate 20 and the rotary gate 21 are sequentially transported by the lifting device 61, These are attached to the downstream side of the drive device 22.

An extension process of the screw conveyor device 14 including the above-described processes will be schematically described with reference to a flowchart.

As shown in FIG. 12, first, the slide gate 20 and the rotary gate 21, which are gate devices, are removed (gate device removing step: step S1). Next, the first casing 23 and the first auger 30 are welded (welding process: step S2).

Subsequently, the drive device 22 that rotationally drives the first auger 30 is removed (drive device removing step: step S3).

Next, the upstream end of the second auger 31 is connected to the downstream end of the first auger 30 (auger connecting step: step S4). After that, the welded portion between the first casing 23 and the first auger 30 is removed (welded portion removing step: step S5).

Next, the downstream end of the first casing 23 is connected to the upstream end of the second casing 26 that houses the second auger 31 (casing connecting step: step S6).

The drive device 22 is connected to the downstream end of the second auger 31 (drive device connecting step: step S7), and then the slide gate 20 and the rotary gate 21 are connected to the downstream side of the drive device 22 (gate device connection). Process: Step S8).

As described above, according to the extension method of the screw conveyor device 14 of the present embodiment, the screw conveyor device 14 is extended after the initial excavation and before the main excavation, that is, after a certain space is secured. As a result, the length of the screw conveyor device 14 can be made longer than that during the initial excavation. This makes it easier to adjust the position of the screw conveyor device 14 with respect to the conveyor device such as a belt conveyor provided on the downstream side of the screw conveyor device 14.

In the extension step of the present embodiment, the auger connecting step of connecting the downstream end of the first auger 30 to the upstream end of the second auger 31 and the second auger 31 in the downstream end of the first casing 23. A second casing connecting step of connecting the upstream end of the second casing 26 is included. In this way, by connecting the second auger 31 to the first auger 30 and connecting the second casing 26 to the first casing 23, the length of the auger and the casing, that is, the length of the screw conveyor device 14 is initially advanced. It can be made longer than time.

Further, in the auger connecting step of the present embodiment, the guide bolt 44 is provided at the upstream end of the second casing 26, the second auger 31 is slid along the guide bolt 44 and brought into contact with the first auger 30, and then, The downstream end of the 1st auger 30 and the upstream end of the 2nd auger 31 are connected. By such a method, it becomes easy to connect the second auger 31 to the first auger 30.

Further, in the casing connecting step of the present embodiment, the second casing 26 is slid along the guide bolts 44 and brought into contact with the downstream end of the first casing 23, and in this state, the downstream end of the first casing 23 and the second casing. The upstream end of 26 is connected. By such a method, it becomes easy to connect the second casing 26 to the first casing 23.

Further, in the present embodiment, a welding process of welding the first casing 23 and the first auger 30 is performed before the drive device removing process. This can prevent the rotation of the first auger 30 with respect to the first casing 23.

Further, in the present embodiment, the welded portion removing step of removing the welded portion between the first casing 23 and the first auger 30 is performed after the auger connecting step. As a result, the first auger 30 can be rotated by removing the welded portion.

Further, in the present embodiment, the rear working deck 52 and the rear working deck 53 are provided before the step of connecting the first auger 30 and the second auger 31 (auger connecting step). This facilitates the work of the auger connecting step.

(Other embodiments)
The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention. For example:

Although the slide gate 20 and the rotary gate 21 are provided as the gate device in the above-described embodiment, the present invention is not limited to this, and the gate device may be configured by only the slide gate 20.

Moreover, in the said embodiment, although it comprised so that the welding process which welds the 1st casing 23 and the 1st auger 30 and the welding part removal process which removes this welding part may be performed, it is not limited to this. Instead of these, the first auger 30 may be pressed by a pressing member or the like to prevent the rotation of the first auger 30 with respect to the first casing 23.

In addition, in the auger connecting step of the above-described embodiment, after the second auger 31 is slid along the guide bolt 44 and brought into contact with the first auger 30, the downstream end of the first auger 30 and the upstream end of the second auger 31. However, the present invention is not limited to this, and the second auger 31 can be slid in the second casing 26 and connected to the first auger 30 without providing the guide bolt 44. Good.

Further, in the casing connecting step of the above-described embodiment, the second casing 26 is slid along the guide bolt 44 to be brought into contact with the downstream end of the first casing 23, and in this state, the downstream end of the first casing 23 and the second casing are connected. Although the upstream end of 26 is connected, it is not limited to this. The second casing 26 may be moved toward the first casing 23 by adjustment by the lifting device 61 without providing the guide bolt 44.

1 Shield machine 14 Screw conveyor device 20 Sliding gate (gate device)
21 Rotary gate (gate device)
22 Drive device 23 1st casing 26 2nd casing 30 1st auger 31 2nd auger 44 Guide bolt

Claims (7)

A method for extending a screw conveyor device provided in a shield machine to discharge excavated soil,
A method of extending a screw conveyor device comprising an extension step of extending the screw conveyor device after initial excavation and before main excavation. The extension step,
A gate device removing step of removing the gate device arranged at the downstream end of the elongated first casing provided in the screw conveyor device;
A drive device removing step of removing a drive device that is provided between the first casing and the gate device and rotationally drives a spiral-shaped first auger that is rotationally driven in the first casing;
An auger connecting step of connecting an upstream end of a second auger to a downstream end of the first auger;
A casing connecting step of connecting an upstream end of a second casing accommodating the second auger to a downstream end of the first casing;
A drive device connecting step of connecting the drive device to a downstream end of the second auger;
The method of extending the screw conveyor device according to claim 1, further comprising a gate device connecting step of connecting the gate device to a downstream side of the drive device. In the auger connecting step, a plurality of rod-shaped guide bolts are provided at an upstream end of the second casing, the second auger is slid along the guide bolts to come into contact with the first auger, and then the first auger is attached. The method for extending the screw conveyor device according to claim 2, wherein the downstream end of the auger and the upstream end of the second auger are connected. In the casing connecting step, the second casing is slid along the guide bolt to come into contact with the downstream end of the first casing, and in this state, the downstream end of the first casing and the upstream end of the second casing are connected. The method for extending the screw conveyor device according to claim 3, wherein The extension of the screw conveyor device according to any one of claims 2 to 4, wherein the extending step further includes a welding step of welding the first casing and the first auger before the drive device removing step. Method. The method of extending the screw conveyor device according to claim 5, wherein the extending step further includes a welded portion removing step of removing a welded portion between the first casing and the first auger after the auger connecting step. The shield machine has a rear work deck provided during the initial excavation,
7. The method of extending the screw conveyor device according to claim 2, wherein the extending step further includes a deck attaching step of attaching another rear working deck to the rear working deck before the auger connecting step. ..

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