JP2022020134A - Sediment transport device in shield excavation machine and sediment transport method - Google Patents

Abstract

To provide a sediment transport method allowing reliable transportation of sediment excavated by a shield excavation machine to a sediment transport device installed at the side part of a shield tunnel from a discharge port of a screw conveyer installed near the center of an excavator, dispensing with another screw conveyer or a belt conveyer.SOLUTION: A sediment transport device 2 transports sediment discharged from a screw conveyer 14 provided at a shield excavator 1 having a cutter head 11, a cutter chamber 13 for taking in the sediment excavated by the cutter head 11 and the screw conveyer 14 for taking out the sediment of the cutter chamber 13, to a carrying device 3. The sediment transport device 2 is cylindrically formed to allow pass of the sediment discharged from the screw conveyer 14, and is constituted of a taking-in member 21 connected to a discharge port 142 of the screw conveyer 14, a discharge member 23 discharging the sediment to the carrying device 3, a connection member 22 connected to the taking-in member 21 and the discharge member 23 and having a rotation part 221b rotatable around a sediment transporting direction, and a driving part 224 imparting torque to the rotation part 221b.SELECTED DRAWING: Figure 2

Description

The present invention relates to a sediment transport technique in a shield excavator using a screw conveyor.

In general, a mud pressure type shield excavator excavates the ground of the entire face with a rotary cutter head, takes in the excavated earth and sand in the cutter chamber partitioned by the cutter head and the bulkhead, and injects mud material. It is agitated and plastically fluidized, and carried out to the rear of the shield excavator in the excavation direction via a screw conveyor provided below the bulkhead. Sediment discharged from the screw conveyor may be loaded onto a sediment transport trolley via a belt conveyor and transported / carried out of the shield tunnel, or if the transport distance is short, it may be pumped by piping.
According to Patent Document 1, a screw conveyor provided with a soil discharge amount adjusting device capable of adjusting the amount of sediment discharged from a discharge port by opening and closing a slide plate, and an invention in which soil is discharged from a discharge port to a belt conveyor are disclosed. ing.

Japanese Unexamined Patent Publication No. 61-52624

Due to the recent increase in needs for low cost and rapid construction, the application record of the above-mentioned mud pressure shield method is increasing instead of the muddy water shield method. However, the illustrated methods for transporting and carrying out excavated earth and sand are all examples of application to small-section tunnels, and in the case of large-section, long-distance shield tunnels with a diameter of 10 m or more and an extension of more than several kilometers, the earth and sand discharged from the screw conveyor. In principle, earth and sand transport trolleys that require rails for transporting and carrying out are not used. This is because it is necessary to preferentially arrange the rails of the segment supply bogie near the center of the shield tunnel in order to improve the supply capacity to the face of the segment in order to cope with the rapid increase.
Generally, in a large-section tunnel, a method of continuously arranging a belt conveyor toward the outside of the tunnel is adopted in the space on the side of the tunnel, taking advantage of the advantage. In this case, since the screw conveyor is installed below the bulkhead, that is, almost in the center of the shield excavator due to the need to discharge the plastically fluidized earth and sand in the cutter chamber, the belt provided from the discharge port to the side of the tunnel. Since it was not possible to discharge the earth and sand directly to the conveyor, it was necessary to separately install a screw conveyor and a belt conveyor for horizontal transportation.
However, the equipment cost of the separate screw conveyor is high, and the separate belt conveyor is directly under the screw conveyor discharge port and directly above the belt conveyor. If a hopper or a soil discharge amount adjusting device is used to prevent the conveyor belt from overflowing, a relatively large space will be occupied and the equipment cost will increase.

An object of the present invention is to use a separate screw conveyor or a separate screw conveyor for excavating earth and sand by a shield excavator, from the discharge port of the screw conveyor arranged near the center of the excavator to the earth and sand transport device arranged on the side of the shield tunnel. It is an object of the present invention to provide a sediment transport device and a sediment transport method in a shield excavator which enables reliable transport without the need for a belt conveyor.

In order to achieve the above object, one aspect of the earth and sand transport device according to the present invention is a shield excavation having a cutter head, a cutter chamber for taking in the earth and sand excavated by the cutter head, and a screw conveyor for taking out the earth and sand in the cutter chamber. An earth and sand transport device that transports the earth and sand discharged from the screw conveyor installed in the machine to the transport device, and the earth and sand transport device is formed in a tubular shape so as to be able to pass through the earth and sand discharged from the screw conveyor. A rotation that is connected to a take-in member connected to the discharge port of the screw conveyor, a discharge member that discharges earth and sand to the transport device, and the intake member and the discharge member, and is rotatable about the earth and sand transport direction. It is characterized by comprising a connecting member having a portion and a driving portion that applies a rotational force to the rotating portion.

An intake member which is formed in a cylindrical shape so as to allow the earth and sand discharged from the screw conveyor to pass through, which is one aspect of the present invention, and is connected to the discharge port of the screw conveyor, and a discharge member which discharges the earth and sand to a transport device. If a sediment transporting device is used, the sediment transporting device comprises a connecting member, a connecting member connected to the discharge member and having a rotating portion that can rotate about the sediment transporting direction, and a driving portion that applies a rotational force to the rotating portion. By the rotational force of the earth and sand, it is possible to transfer the earth and sand while suppressing the blockage of the earth and sand in the earth and sand transport device.

Further, in another aspect of the earth and sand transporting device according to the present invention, it is characterized by having an inclined portion inclined toward the transporting device.

According to this aspect, since the earth and sand transport device has an inclined portion inclined toward the transport device, the earth and sand can be easily passed by the earth and sand transport accompanied by gravity, and the blockage can be suppressed.

Further, in another aspect of the earth and sand transport device according to the present invention, the connecting member is a double pipe composed of an outer pipe and an inner pipe which is a rotating portion, and the outer pipe includes the intake member and the discharge member. It is characterized by being spliced to.

According to this aspect, the connecting member is a double pipe composed of an outer pipe and an inner pipe which is a rotating portion, and the outer pipe is joined to the intake member and the discharge member to ensure watertightness. Sediment passing through the earth and sand transport device is surely carried out to the transport device without leaking.

Further, one aspect of the earth and sand transport method according to the present invention is the earth and sand transfer method using the earth and sand transfer device of the pillar member, the earth and sand excavation uptake step in which the earth and sand excavated by the cutter head is taken in by the cutter chamber, and the above. It is characterized by a sediment discharge step of discharging the sediment taken into the cutter chamber to the sediment transport device by a screw conveyor, and transporting the sediment to the transport device while rotating the rotating portion.

According to this aspect, a take-in member which is formed in a cylindrical shape so as to allow the earth and sand discharged from the screw conveyor to pass through and is connected to the discharge port of the screw conveyor, and a discharge member which discharges the earth and sand to the transport device are connected. If a sediment transporting device including a connecting member connected to the member and the discharge member and having a rotating portion that can rotate about the earth and sand transporting direction, and a driving unit that applies a rotational force to the rotating portion, the rotating portion rotates. The force can suppress the blockage of earth and sand in the earth and sand transport device.

According to the sediment transport device and the sediment transport method of the present invention, the sediment excavated by the shield excavator is transported to the side of the shield tunnel from the discharge port of the screw conveyor arranged near the center of the excavator. It enables reliable transportation to the equipment without the need for a separate screw conveyor or belt conveyor.

It is sectional drawing which shows the arrangement state in the shield excavator of the earth and sand transport device which concerns on embodiment of this invention. It is a top view (AA of FIG. 1) of the earth and sand transporting apparatus which concerns on embodiment of this invention. It is a side view (BB of FIG. 2) of the earth and sand transporting apparatus which concerns on embodiment of this invention. It is sectional drawing (CC of FIG. 2) of the earth and sand transporting apparatus which concerns on embodiment of this invention. It is sectional drawing (DD of FIG. 4) of the earth and sand transporting apparatus which concerns on embodiment of this invention.

Hereinafter, the earth and sand transfer device and the earth and sand transfer method according to the embodiment of the present invention will be described with reference to the attached drawings. In the present specification and the drawings, substantially the same components are designated by the same reference numerals to omit duplicate explanations.

First, with reference to FIG. 1, the overall outline of the earth and sand transport device according to the embodiment will be described. FIG. 1 is a cross-sectional view showing an arrangement state of a sediment transport device according to an embodiment of the present invention in a shield excavator.
The shield excavator 1 according to the present embodiment is applied to a mud pressure type shield method, and as shown in the figure, a cutter head 11 in which a large number of cutter bits capable of excavating a face ground by rotary pressing force are arranged. Is provided on the front. Further, on the back surface of the cutter head 11, a bulkhead 12 is arranged integrally with a cylindrical body 15 constituting the outer shell of the shield excavator 1 as a partition wall for keeping the inside of the shield excavator 1 at 1 atm. A cutter chamber 13 capable of taking in the earth and sand excavated by the cutter head 11 is arranged between the cutter head 11 and the bulkhead 12. Further, below the bulkhead 12, a screw conveyor 14 is provided so as to penetrate the bulkhead 12. By the rotation of the screw shaft 141 carrying the spiral blade provided in the screw conveyor 14, the earth and sand accumulated in the cutter chamber 13 is discharged from the discharge port 142 of the screw conveyor 14.

The earth and sand discharged from the discharge port 142 is discharged to the conveyor 3 via the earth and sand conveyor 2. The transport device 3 is configured by combining a plurality of belt conveyors, and is transported / carried out to the outside of the shield tunnel ST.

Next, with reference to FIGS. 2 and 3, the overall configuration of the earth and sand transport device according to the embodiment will be described. FIG. 2 is a plan view (AA of FIG. 1) of the earth and sand transport device according to the embodiment of the present invention, and FIG. 3 is a side view of the earth and sand transfer device according to the embodiment of the present invention (B of FIG. 2). -B).
From FIG. 2, the earth and sand transport device 2 is formed in a cylindrical shape so that the earth and sand discharged from the screw conveyor 14 can pass through, and the earth and sand are transferred to the take-in member 21 and the transport device 3 connected to the discharge port 142 of the screw conveyor 14. Rotated to the connecting member 22 and the rotating portion 221b which are connected to the discharging member 23, the taking-in member 21 and the discharging member 23 for discharging, and have a rotating portion 221b (inner pipe 221b described later) that can rotate about the earth and sand transport direction. It is composed of a drive unit 224 that applies force. The outer shell of the earth and sand transport device 2 is formed by combining a plurality of steel plate processed members.

The take-in member 21 includes a cylindrical take-in pipe 211, a flange-shaped second connecting portion 212 and a first joining portion 213 formed in a ring shape at both ends thereof.
The second connecting portion 212 is connected to the first connecting portion 143 having the same flange shape formed at the end of the discharge port 142 of the screw conveyor 14 by a plurality of bolts and nuts in a back-to-back contact state. As described above, the screw conveyor 14 is shielded because it is provided below the bulkhead 12, that is, substantially in the center of the shield excavator 1 due to the necessity of discharging the plastically fluidized earth and sand in the cutter chamber 13 due to its nature. It is necessary to laterally transport the earth and sand to the transport device 3 provided on the side of the tunnel ST. Therefore, in the present embodiment, a 90-degree curved pipe is adopted as the intake pipe 211 for transporting earth and sand.

The basic configuration of the connecting member 22 is a cylindrical connecting pipe 221 and a flange-shaped second joint portion 222 and a third joint portion 223 formed in a ring shape at both ends thereof.
The second splicing portion 222 is spliced to the first splicing portion 213 by a plurality of bolts and nuts.
A part of the connecting pipe 221 on the second splicing portion 222 side has a large outer diameter for accommodating the bearing portion 226 described later. Further, a drive unit 224 made of a motor is mounted on the upper outer surface of the connecting pipe 221, and a gear part 225 made of a pinion gear for transmitting a rotational force to the bearing part 226 is connected to the drive part 224. .. Further, the connecting pipe 221 is provided with a manhole 228 composed of a plurality of through holes so that an operator can enter the connecting member 22 at the time of inspection or in an emergency. During normal operation, it is sealed by a lid plate. In addition, the connecting pipe 221 is provided with a plurality of roller portions 227 for rotationally supporting the rotating portion 221b (inner pipe 221b described later).

The discharge member 23 includes a cylindrical discharge pipe 231, a flange-shaped fourth joint portion 233 formed in a ring shape at both ends thereof, an end plate 234 on the plate, and a box-shaped discharge port 232.
The fourth joint portion 233 is joined to the third joint portion 223 by a plurality of bolts and nuts.
A notch is formed in the connection portion of the discharge pipe 231 with the discharge port 232 along the inner edge of the connection portion so that the conveyed earth and sand can be inserted. In order to discharge the earth and sand directly above the conveyor 3, the discharge port 232 is connected in the orthogonal direction along the end surface of the discharge pipe 231 with its central axis aligned with the central axis of the conveyor 3. Further, the end plate 234 is connected so as to close the end surface of the discharge pipe 231 and the opening formed along the side surface of the discharge port 232.

From FIG. 3, the earth and sand transport device 2 is supported by a gantry 4 for fixing to a trailing carriage (not shown) towed by the shield excavator 1. The gantry 4 is formed by combining a plurality of shaped steel materials as a main member. The earth and sand transfer device 2 as a whole has an inclined portion inclined toward the transfer device 3 so that the earth and sand to be conveyed can smoothly pass through the pipe. The earth and sand that has passed through the earth and sand transport device 2 is finally discharged toward the transport device 3 from the opening 235 which is a rectangular opening provided in the discharge port 232.

Next, among the earth and sand transporting devices according to the embodiment, the rotation mechanism will be described with reference to FIGS. 4 and 5. FIG. 4 is a cross-sectional view (CC of FIG. 2) of the earth and sand transport device according to the embodiment of the present invention, and FIG. 5 is a cross-sectional view of the earth and sand transfer device according to the embodiment of the present invention (D of FIG. 4). -D).
From FIG. 4, the connecting pipe 221 constituting the main member of the connecting member 21 having a cylindrical shape has a double pipe structure including an outer pipe 221a and an inner pipe 221b (rotating portion 221b). The above-mentioned drive unit 224, manhole 228, roller unit 227, and the second joint portion 222 and the third joint portion 223 for joining the intake member 21 and the discharge member 23 are all fixed to the outer pipe 221a. ing.

From FIG. 5, the bearing portion 226 is mainly formed by an outer ring 226a, an inner ring 226b, a ball 226c, and a spacer 226d.

From FIGS. 4 and 5, the outer ring 226a has a ring shape, and its outer surface is formed in a gear shape so as to be able to mesh and rotate with the gear portion 225. As a result, the rotational force of the motor of the drive unit 224 can be transmitted to the outer ring 226a via the gear unit 225 composed of the pinion gear. Further, from FIG. 4, the outer ring 226a is integrally fixed to the inner pipe 221b with a plurality of bolts.

From FIGS. 4 and 5, the inner ring 226b is formed in a ring shape on the concentric circles of the outer ring 226a, and is integrally fixed to the second splicing portion 222 formed at the end of the outer pipe 221a with a plurality of bolts. ing.

From FIG. 5, a plurality of balls 226c and a spacer 226d are continuously arranged in a ring shape between the outer ring 226a and the inner ring 226b so as to be adjacent to each other. Since the outer ring 226a and the inner ring 226b are in contact with each other via the ball 226c, it is possible to reduce the frictional force with the inner ring 226b generated by the rotation of the outer ring 226a. This is a friction reduction effect due to the so-called ball bearing mechanism. It is desirable that the coupling portion between the ball 226c and the spacer 226d is filled with lubricating oil. As described above, since the outer ring 226a is formed integrally with the inner pipe 221b, the inner pipe 221b rotates with the rotation of the outer ring 226a. The sediment passing through the inner pipe 221b is less likely to adhere to the inner surface of the inner pipe 221b due to the rotation of the inner pipe 221b, and the clogging of the sediment as a whole of the sediment transport device 2 is suppressed.

From FIG. 4, the roller portion 227 is composed of a roller box 227a, a shaft portion 227b, and a roller 227c. The roller box 227a stores a shaft portion 227b connected to the outer pipe 221a and rotatably connected to the roller box 227a so as to be laid horizontally, and a tire-shaped roller 227c provided around the shaft portion 227b. There is. The roller 227c is an elastic body made of rubber and comes into contact with the inner pipe 221b through a through hole provided in the outer pipe 221a. Since the roller portion 227 is installed in the outer pipe 221a at a position facing the bearing portion 226, the inner pipe 221b is supported by the outer pipe 221a by the bearing portion 226 and the roller portion 227 in the axial direction thereof. It has a structure.

An O-ring 229 is interposed on the sliding surface between the inner ring 226b and the inner pipe 221b and the inner ring 226b and the discharge pipe 231. Grease (not shown) is applied around the O-ring 229, and a waterproof zone is formed by the packing effect of the pressing force of the O-ring 229 and the water-repellent effect of the grease.

According to the earth and sand transfer device and the earth and sand transfer method in the shield excavator of the present embodiment, the earth and sand transfer device is formed in a tubular shape so as to be able to pass through the earth and sand discharged from the screw conveyor, and is connected to the discharge port of the screw conveyor. A coupling member, a discharge member that discharges earth and sand to a transport device, a connecting member that is connected to the connection member and the discharge member and has a rotating portion that can rotate about the earth and sand transport direction, and a rotating portion that is subjected to rotational force. Since it is composed of a drive unit, it is possible to suppress blockage of earth and sand in the earth and sand transport device by the rotational force of the rotating unit.
Further, since the earth and sand transporting device has an inclined portion inclined toward the transporting device, the earth and sand transporting accompanied by gravity facilitates the passage of earth and sand, and blockage can be suppressed.
In addition, the connecting member is a double pipe consisting of an outer pipe and an inner pipe that is a rotating part, and the outer pipe is joined to the intake member and the discharge member to ensure watertightness and inside the earth and sand conveyor. The earth and sand that pass through the pipe will not leak, and will be reliably carried out to the conveyor.

It should be noted that the configuration or the like described in the above embodiment may be another embodiment in which other components are combined, and the present invention is not limited to the configuration shown here. .. For example, in order to further improve the transporting force of earth and sand due to the rotation of the inner pipe 221b, a spirally continuous blade member (flight) may be attached along the inner surface of the inner pipe 221b in the present embodiment, or the earth and sand may be attached. A plurality of non-continuous blade plates may be provided so as to intersect with each other in the transport direction.
This point can be changed without departing from the spirit of the present invention, and can be appropriately determined according to the application form thereof.

ST Shield tunnel 1 Shield excavator 11 Cutter head 12 Bulk head 13 Cutter chamber 14 Screw conveyor 15 Body 141 Screw shaft 142 Discharge port 143 First connection part 2 Sediment transfer device 21 Intake member 211 Intake pipe 212 Second connection part 213 1st joint 22 Connecting member 221 Connecting pipe 221a Outer pipe 221b Inner pipe (rotating part)
222 2nd splicing part 223 3rd splicing part 224 Drive part 225 Gear part 226 Bearing part 226a Outer ring 226b Inner ring 226c Ball 226d Spare 227 Roller part 227a Roller box 227b Shaft part 227c Roller 228 Manhole 229 O-ring 23 Discharge Member 231 Discharge pipe 232 Discharge port 233 4th joint 234 End plate 235 Opening 3 Transport device (belt conveyor)
4 gantry

Further, in the embodiment of the earth and sand transport device according to the present invention , the connecting member is a double pipe composed of an outer pipe and an inner pipe which is the rotating portion, and the outer pipe is formed into the intake member and the discharge member. It is characterized by being spliced together.

Claims (4)

A cutter head, a cutter chamber that takes in the earth and sand excavated by the cutter head, and a screw conveyor that takes out the earth and sand of the cutter chamber, and a screw conveyor that takes out the earth and sand of the cutter chamber. It is a sediment transport device that transports
The earth and sand transport device is formed in a cylindrical shape so that the earth and sand discharged from the screw conveyor can pass through.
The intake member connected to the discharge port of the screw conveyor and
A discharge member that discharges earth and sand to the transport device,
A connecting member that is connected to the intake member and the discharge member and has a rotating portion that can rotate about the earth and sand transport direction.
An earth and sand transport device comprising a drive unit that applies a rotational force to the rotating unit. The earth and sand transporting device according to claim 1, further comprising an inclined portion inclined toward the transporting device. The connecting member is a double pipe composed of an outer pipe and an inner pipe which is a rotating portion.
The earth and sand transport device according to claim 1 or 2, wherein the outer pipe is joined to the intake member and the discharge member. A method for transporting sediment using the sediment transport device according to any one of claims 1 to 3.
The earth and sand excavation take-in process in which the cutter chamber takes in the earth and sand excavated by the cutter head, and
A sediment discharge process in which the sediment taken into the cutter chamber is discharged to the sediment transfer device by a screw conveyor, and
A method for transporting earth and sand, which comprises transporting earth and sand to the transport device while rotating the rotating portion.

Images