JP7146351B2 - Extension method of screw conveyor device - Google Patents

Description

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

Conventionally, in underground propulsion work, a shield tunneling machine is placed in a starting shaft, and a segment ring composed of a plurality of segments is sequentially connected while excavating the bedrock from the starting shaft to the arrival shaft with the shield tunneling machine. (See Patent Document 1, for example). The excavated earth and sand is discharged rearward by a screw conveyor device, and the discharged excavated earth and sand is conveyed by a conveying device such as a belt conveyor.

Japanese Patent Application Laid-Open No. 2003-214085

However, since the starting shaft in which the shield machine is first placed is often narrow, the screw conveyor device for the shield machine placed in the starting shaft is short. Also, when the initial excavation is completed and the main excavation is performed, the short screw conveyor device is used. Therefore, it was sometimes difficult to adjust the position of the screw conveyor device with respect to a conveying device such as a belt conveyor provided downstream of the screw conveyor device.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a method for extending a screw conveyor device that makes it easier to adjust the position of the screw conveyor device with respect to the conveying device by making the screw conveyor device longer than it is during the initial excavation.

A method for extending a screw conveyor device according to the present invention is a method for extending a screw conveyor device provided in a shield machine for discharging excavated earth and sand, wherein the screw conveyor device is extended after initial excavation and before main excavation. It has an extension process.

According to the present invention, after the initial excavation and before the main excavation, i.e., after a certain amount of space is secured, the screw conveyor is extended in the extension step, thereby increasing the length of the screw conveyor from 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 a conveying device such as a belt conveyor provided downstream of the screw conveyor device.

In the above invention, the extending step includes a gate device removing step of removing a gate device disposed at a downstream end of a long first casing provided in the screw conveyor device, and a gate device removing step of removing the first casing and the gate device. and a driving device removing step of removing a driving device that rotationally drives the spiral first auger that is provided between and rotationally driven in the first casing, and upstream of the second auger at the 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 housing the second auger to the downstream end of the first casing; and a downstream end of the second auger to the driving device. and a gate device connecting step of connecting the gate device to the downstream side of the driving 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, i. It can be elongated.

In the above invention, in the auger connection step, a plurality of rod-shaped guide bolts are provided at the upstream end of the second casing, and after the second auger is slid along the guide bolts and brought into contact with the first auger , preferably connecting the downstream end of the first auger and the upstream end of the second auger.

According to the above configuration, it becomes easier 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 and 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

According to the above configuration, it becomes easier 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 together before the driving device removing step.

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

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 made rotatable by removing the welded portion.

In the above invention, the shield machine has a rear working deck provided during initial excavation, and the extending step further includes a deck mounting step of mounting another rear working deck on the rear working deck prior to the auger connecting step. preferably included.

According to the above configuration, since the separate rear work deck is attached before the auger connection process, the work of the auger connection process is facilitated.

According to the present invention, it is possible to provide a method for extending a screw conveyor device that makes it easier to adjust the position of the screw conveyor device with respect to the conveying device by making the screw conveyor device longer than it is during the initial excavation.

FIG. 3 is a cross-sectional view showing a state at the start stage of a method for extending a screw conveyor device according to an embodiment of the present invention; It is a figure which shows the state which the slide gate after removal is moved by the lifting apparatus. It is a figure which shows the state in which the upper part of the 1st casing after removal is moved by the lifting apparatus. It is a figure which shows the state in which the drive device after removal is moved by the lifting device. Fig. 3 shows another rear work deck being carried by a lifting device; FIG. 10 is a diagram showing a state where a guide bolt is attached to a second casing carried by a lifting device and a state before the second auger is slid toward the first auger via the guide bolt and connected. FIG. 10 is a diagram showing a state after the second casing has been slid toward and connected to the first casing via the guide bolts; It is a figure which shows the state which the turnbuckle removed by the previous process was attached to the bracket of the 2nd casing. FIG. 11 shows a state in which the casing lower portion is attached to the downstream end of the second casing; It is a figure which shows the state by which the drive device was connected with the 2nd auger. FIG. 11 shows a state in which the casing upper part is attached to the downstream end of the second casing, and the slide gate and the rotary gate are 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 merely 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 scope of the present invention.

FIG. 1 shows a state in which the shield machine 1 is placed in a starting shaft 200 during initial excavation. The shield machine 1 is a mud pressure type shield machine that converts excavated earth and sand into mud by adding a mud additive and applies mud pressure to the working face for excavation. Although the shield machine 1 is of the cutter bit type, it may be of the roller cutter type.

As shown in FIG. 1, in the underground propulsion work, the shield machine 1 is placed in a starting shaft 200 at the time of initial excavation. Then, while excavating the natural ground by the shield machine 1, the segment rings 100 (see FIG. 2) are sequentially connected up to an unillustrated arrival shaft.

The shield machine 1 of this embodiment is a folding 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 is composed of a front body 4 and a rear body 5 . The front barrel 4 and the rear barrel 5 are connected by a bent portion 6 . A bulkhead 8 that forms a cutter chamber 13 together with the cutterhead 2 is provided at the front of the front barrel 4 . The cutter head 2 includes a cutter head flange that is an annular plate, and a 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 extending and contracting the center-folding jack 9 . For example, by making the amount of extension of the left side bending jack 9 larger than the extension amount of the right side bending jack 9 in plan view, the excavator body 3 can be bent rightward. The excavator main body 3 can be bent in the left direction.

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

A plurality of shield jacks 11 are provided on the front portion of the rear trunk 5 of the excavator main 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 main body 3 can be advanced while excavating the ground.

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

The screw conveyor device 14 includes a cylindrical first casing 23 and an elongated first auger 30 (see FIG. 3) provided at the downstream end of the first casing 23 and arranged in the first casing 23 ), a driving device 22 that rotationally drives the first auger 30 , and a slide gate 20 and a rotary gate 21 provided downstream of the driving device 22 . The slide gate 20 and the rotary gate 21 correspond to gate devices. The first auger 30 is rotatably arranged within the first casing 23 . The slide gate 20 is a type of gate that pulls up the door body, and by pulling up the door body, earth and sand are 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 earth and sand to the outside.

An erector device 70 for assembling the segment ring 100 to a predetermined position on the tunnel wall surface is rotatably provided on the framework 15 provided on the rear trunk 5 of the excavator main body 3 . More specifically, the erector device 70 includes a slewing ring 10 supported inside the rear fuselage 5 so as to be rotatable along the rear fuselage 5, and a slider attached to the slewing ring 10 for transporting the segment to a predetermined position on the tunnel wall surface. It has a moving portion 16 and a gripping portion 17 attached to the tip of the sliding portion 16 for gripping 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 to press the segment ring 100 from the inside.

Furthermore, the excavator main 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 working deck 50 is fixed to the framework 15 by welding. Thereby, the rear working deck 50 is provided in a cantilevered state.

In this embodiment, after initial excavation is performed by the shield machine 1 having the configuration described above during the initial excavation, the screw conveyor device 14 is extended in the extension process before the main excavation is performed. A method for extending the screw conveyor device 14 will be described in detail below.

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

Subsequently, after the actuator 43a, which is a part of the shape retaining device 43, is dismantled, a guide rail 60 is provided in parallel with the axial direction of the excavator main body 3 over the inside of the excavator main body 3 and the inside of the segment ring 100. . The guide rail 60 is provided with a pair of hoisting devices 61 configured to be movable in the longitudinal direction of the guide rail 60 and for hoisting and transporting an object.

Next, after the unillustrated counterweight of the rear working deck 50 is removed and moved by the lifting device 61 , the rotary gate 21 and the slide gate 20 are removed and moved by the lifting device 61 . 2 shows how the removed slide gate 20 is being moved by the lifting device 61. As shown in FIG.

Then, after a portion of the rear working deck 50 and the turnbuckle 41 are removed, the upper portion 24 of the first casing 23 immediately upstream of the drive device 22 is removed and lifted by the lifting device 61 as shown in FIG. be moved.

Next, the first auger 30 and the first casing 23 are welded together. Welding can prevent rotation of the first auger 30 with respect to the first casing 23 (rotation prevention). After that, the driving device 22 is removed and moved by the lifting device 61, as shown in FIG.

Subsequently, after the counterweight frame 51 is removed, another rear work deck 52 is moved toward the rear work deck 50 by the lifting device 61 and attached to the rear work deck 50 as shown in FIG. Also, the lower part 25 corresponding to the upper part 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 (extended casings) are 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 . After that, 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. In addition, 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 along the guide bolts 44 toward the first casing 23 to come into contact with the downstream end of the first casing 23, and in this state, the first casing 23 is moved. and the upstream end of the second casing 26 are connected and fixed by bolts, for example. After that, the above-described anti-rotation welded portion is removed. Note that the downstream portion of the second auger 31 protrudes from the second casing 31 when the second casing 26 is connected to the first casing 23 .

Then, 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 folding jack 9 . Also, another rear working deck 54 is moved toward the rear working deck 50 by the lifting device 61 and mounted on the rear working deck 53 .

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

Subsequently, as shown in FIG. 10, after the driving device 22 is transported by the lifting device 61 and the driving device 22 is connected to the second auger 31, the driving device 22 and the casing lower part 27 are separated from each other, for example. It is bolted and the drive 22 and the second auger 31 are welded together.

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 downstream of the drive device 22 .

The extension process of the screw conveyor device 14 including each process as described above will be schematically described with reference to a flow chart.

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

Subsequently, the driving device 22 that rotationally drives the first auger 30 is removed (driving device removal 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). Thereafter, the welded portion between the first casing 23 and the first auger 30 is removed (welded portion removal step: step S5).

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

Then, the drive device 22 is connected to the downstream end of the second auger 31 (drive device connection 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 method for extending 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 amount of space has been secured. Thus, 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 a conveying device such as a belt conveyor provided downstream of the screw conveyor device 14 .

Further, the extension process of the present embodiment includes an auger connection process of connecting the upstream end of the second auger 31 to the downstream end of the first auger 30, and an auger connection process of housing the second auger 31 in the downstream end of the first casing 23. and a second casing connecting step of connecting the upstream end of the second casing 26 . 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, can be reduced during initial excavation. It can be made longer than the time.

In addition, in the auger connection step of the present embodiment, a guide bolt 44 is provided at the upstream end of the second casing 26, and 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 are connected. Such a method makes it easier to connect the second auger 31 to the first auger 30 .

In addition, in the casing connection process of the present embodiment, the second casing 26 is slid along the guide bolt 44 to contact 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. 26 upstream end. Such a method makes it easier to connect the second casing 26 to the first casing 23 .

Moreover, in this embodiment, the welding process of welding the 1st casing 23 and the 1st auger 30 is performed before a drive device removal process. This prevents rotation of the first auger 30 with respect to the first casing 23 .

Further, in the present embodiment, a 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 made rotatable by removing the welded portion.

Furthermore, in this embodiment, the rear work deck 52 and the rear work deck 53 are provided before the step of connecting the first auger 30 and the second auger 31 (auger connection step). This facilitates the operation of the auger connection process.

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

In the above-described embodiment, the slide gate 20 and the rotary gate 21 are provided as the gate device.

Further, in the above-described embodiment, the welding step of welding the first casing 23 and the first auger 30 and the welding portion removing step of removing the welded portion are performed. Instead of these, the first auger 30 may be configured to be prevented from rotating with respect to the first casing 23 by, for example, pressing the first auger 30 with a pressing member.

Further, in the auger connection step of the above 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 are connected. However, it is not limited to this, and the second auger 31 is slid within the second casing 26 and connected to the first auger 30 without providing the guide bolt 44. good too.

Furthermore, in the casing connection process of the above embodiment, the second casing 26 is slid along the guide bolt 44 to contact 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. 26, but it is not limited to this. The second casing 26 may be moved toward the first casing 23 by adjusting the lifting device 61 without providing the guide bolt 44 .

1 shield machine 14 screw conveyor device 20 slide gate (gate device)
21 rotary gate (gate device)
22 Drive device 23 First casing 26 Second casing 30 First auger 31 Second auger 44 Guide bolt

Claims (6)

A method for extending a screw conveyor device that is provided in a shield machine and discharges excavated earth and sand,
An extension step of extending the screw conveyor device after the initial excavation and before the main excavation ,
The extension step includes
a gate device removal step of removing a gate device disposed at the downstream end of a first elongated casing provided in the screw conveyor device;
a driving device removing step of removing a driving device that is provided between the first casing and the gate device and that rotationally drives a first spiral auger rotationally driven in the first casing;
an auger connecting step of connecting the upstream end of the second auger to the downstream end of the first auger;
a casing connecting step of connecting an upstream end of a second casing housing the second auger to a downstream end of the first casing;
a driving device connection step of connecting the driving device to the downstream end of the second auger;
and a gate device connection step of connecting the gate device to the downstream side of the drive device . In the auger connection step, a plurality of rod-shaped guide bolts are provided at the upstream end of the second casing, and after the second auger is slid along the guide bolts and brought into contact with the first auger, the first auger 2. The method for extending a screw conveyor apparatus according to claim 1 , 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 and brought 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. 3. The method for extending a screw conveyor device according to claim 2 , wherein The extension of the screw conveyor device according to any one of claims 1 to 3 , wherein the extension step further includes a welding step of welding the first casing and the first auger before the drive device removal step. Method. 5. The method of extending a screw conveyor device according to claim 4 , wherein said extending step further includes a welded portion removing step of removing a welded portion between said first casing and said first auger after said auger connecting step. The shield machine has a rear working deck provided during initial excavation,
6. The method for extending a screw conveyor device according to claim 1 , wherein said extending step further includes a deck attaching step of attaching another rear working deck to said rear working deck before said auger connecting step. .

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