TBM multi-stage slag discharge device and method

Abstract

The present invention relates to the technical field of tunnel boring machines, and specifically to a multi-stage slag discharge device for TBMs, wherein a first-stage belt conveyor is arranged in the shield of the TBM and is a retractable structure; an intermediate-stage belt conveyor is arranged on each trailer except the tail trailer, and the head driving part of the first-stage belt conveyor and the tail slag receiving part of the adjacent intermediate-stage belt conveyor are overlapped up and down, and the adjacent intermediate-stage belt conveyors are overlapped head-to-tail in sequence; the final-stage belt conveyor is arranged on the tail trailer, and its tail is overlapped with the head of the adjacent intermediate-stage belt conveyor, and its head is overlapped with the slag receiving vehicle, and adjustment devices are installed on both sides of the head and tail of the intermediate-stage belt conveyor and the final-stage belt conveyor for adjusting their positional relationship with the trailer. A multi-stage slag discharge method for a small turning radius TBM of a pumped storage power station, using the above-mentioned device to discharge slag. The present invention solves the problems of slag spillage, falling and deviation of belt conveyors during slag discharge.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel boring machines, and in particular to a TBM multi-stage slag discharge device and method. Background Art

[0002] In the curve excavation of a small turning radius TBM used in a pumped storage power station, the change in the posture of the tunnel boring machine will affect the normal operation of the belt conveyor, causing the conveyor belt to deviate, spill material, and drop material, affecting the normal and stable operation of the slag discharge system. The smaller the radius of the TBM equipment excavation curve, the more difficult it is to discharge slag. The curved transportation of slag on TBM equipment is a limiting factor for the widespread application of TBM in the field of small curves. Summary of the invention

[0003] The purpose of the present invention is to provide a TBM multi-stage slag discharge device and method in view of the above-mentioned problems and shortcomings, which solves the problems of slag spilling, falling and deviation when the belt conveyor in the prior art is conveying materials in a curved section, reduces the failure rate of the TBM equipment belt conveyor, improves the construction efficiency and the cleanliness of the tunnel, and can realize the rapid excavation of TBM equipment in the small curve area, solves the problem of slag discharge in the small curve excavation of TBM, breaks the application limitation of TBM in small curves, and expands the TBM application market.

[0004] In order to achieve the above-mentioned object of the invention, the technical solution of the present invention is:

[0005] A TBM multi-stage slag discharge device comprises a primary belt conveyor, an intermediate belt conveyor and a final belt conveyor, wherein the primary belt conveyor is arranged in the shield body of the TBM and is arranged as a retractable structure; an intermediate belt conveyor is arranged on each trailer of the TBM except for the tail trailer, the head driving part of the primary belt conveyor and the tail slag receiving part of the adjacent intermediate belt conveyor are overlapped up and down, the adjacent intermediate belt conveyors are overlapped head-to-tail in sequence from front to back according to the slag discharge direction, and adjustment devices are installed on both sides of the head and tail of the intermediate belt conveyor for adjusting its positional relationship with the trailer; the final belt conveyor is arranged on the tail trailer, the tail of the final belt conveyor overlaps the head of the adjacent intermediate belt conveyor, and its head overlaps the slag receiving vehicle, and the head and tail of the final belt conveyor are installed on both sides of the head and tail for adjusting its positional relationship with the tail trailer.

[0006] Furthermore, in the above-mentioned TBM multi-stage slag discharge device, the adjustment device includes a fixed seat, a first adjustment screw, a fixed support and a fixed rotating shaft, the fixed seat is fixedly connected to the belt frame, the first adjustment screw is horizontally arranged, and its inner end is hingedly connected to the fixed seat, the fixed support is fixedly connected to the trailer, the fixed rotating shaft is vertically arranged, and its bottom is hingedly connected in the fixed support, the fixed rotating shaft is provided with a radial hole, the outer end of the first adjustment screw passes through the radial hole on the fixed rotating shaft, and a first adjustment nut is screwed on each side of the fixed rotating shaft on the first adjusting screw.

[0007] Furthermore, in the above-mentioned TBM multi-stage slag discharge device, variable-path hopper assemblies are provided on both sides of the heads of the intermediate-stage belt conveyor and the final-stage belt conveyor for adjusting the slag falling trajectory. The variable-path hopper assembly includes a hopper side plate and a receiving plate. The inner end of the receiving plate is hingedly connected to the inner side of the hopper side plate through a rotating pin shaft, and the outer end of the receiving plate is connected to an angle adjustment mechanism arranged at the edge of the hopper side plate. The angle adjustment mechanism is used to adjust the inclination angle of the receiving plate relative to the hopper side plate.

[0008] Furthermore, in the above-mentioned TBM multi-stage slag discharge device, the angle adjustment mechanism includes a second adjusting screw, an adjusting block and an adjusting block fixing seat, the adjusting block fixing seat is fixedly connected to the outer side of the hopper side plate, the adjusting block is hingedly connected to the adjusting block fixing seat, the inner end of the second adjusting screw is hingedly connected to the outer end of the receiving plate through a rotating pin, and the outer end thereof passes through the through hole on the hopper side plate and then through the through hole on the adjusting block, and a second adjusting nut is screwed on each side of the adjusting block on the second adjusting screw.

[0009] Furthermore, in the above-mentioned TBM multi-stage slag discharge device, a weight tensioning device is provided in the middle part of the first-stage belt conveyor, and the weight tensioning device is installed on the middle fixed frame and is located in front of the TBM equipment support shield. The weight tensioning device includes a redirecting roller, a tensioning fixed frame, a tensioning roller, a conveyor belt and a counterweight block. The redirecting roller is fixedly connected to the upper part of the tensioning fixed frame, the tensioning roller is slidably connected to the lower part of the tensioning fixed frame, and the counterweight block is connected to the tensioning roller.

[0010] Furthermore, in the above-mentioned TBM multi-stage slag discharge device, a two-stage weight tensioning device is provided in the middle of the first-stage belt conveyor.

[0011] Furthermore, in the above-mentioned TBM multi-stage slag discharge device, a movable tailstock is provided at the tail of the first-stage belt conveyor, and the movable tailstock is installed in the central axis area of ​​the main machine.

[0012] Furthermore, in the above-mentioned TBM multi-stage slag discharge device, a tail drum is installed on the movable tail frame, and the tail drum is located inside the main drive box and below the slag collecting bucket when working.

[0013] Furthermore, in the above-mentioned TBM multi-stage slag discharge device, a material guide trough is installed on the upper part of the tail drum, the height of the material guide trough is lower than the lower part of the slag collecting bucket, and the width is larger than the slag dropping area of ​​the slag collecting bucket; the head drive device of the first-stage belt conveyor is fixedly connected to the support shield.

[0014] A TBM multi-stage slag discharge method adopts any of the TBM multi-stage slag discharge devices described above to discharge slag.

[0015] Beneficial effects of a TBM multi-stage slag discharge device and method of the present invention:

[0016] The multi-stage slag discharge device applied for by the present invention adopts a multi-stage belt conveyor overlap and a first-stage belt conveyor retractable and movable structural design, which has a compact and reasonable structure and saves space. The multi-stage conveyor overlaps to shorten the length of each conveyor stage, enhances flexibility and turning ability, and can greatly reduce the deviation problem of the belt conveyor during curve excavation, reduce the failure rate of the conveyor, reduce maintenance costs, and improve construction progress. Adjustment devices are installed on the head and tail sides of the intermediate belt conveyor and the final belt conveyor, which can adjust their position relationship with the trailer, so that the front and rear belts can still overlap front and back after the trailer turns, ensuring that the slag finally falls into the slag receiving truck, which can realize the rapid excavation of TBM equipment in the small curve area, solve the problem of TBM small curve excavation and slag discharge, break the application limitations of TBM small curves, and expand the TBM application market.

[0017] The adjustable devices arranged at the head and tail sides of the intermediate belt conveyor and the final belt conveyor of the present invention can change the position of the belt conveyor by adjusting the stroke difference of the first adjusting screws on the left and right sides, adapt to the changes of the excavation curve, and better meet the requirements of curved slag discharge.

[0018] Both sides of the heads of the intermediate-stage belt conveyor and the final-stage belt conveyor of the present invention are provided with variable-path drop hopper components, which can change the drop trajectory of the slag and reduce the occurrence of spilled materials.

[0019] The first-stage belt conveyor of the present invention adopts a weight tensioning device, which can provide appropriate tensioning force for the operation of the belt conveyor roller. During the step-changing process of the TBM, the tensioning roller of the weight tensioning device can automatically move up and down according to the extension and retraction of the thrust cylinder stroke, so that the first-stage belt conveyor can be extended and retracted, and can adapt to the stroke changes to meet the step-changing and excavation function requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of a TBM multi-stage slag discharge device according to an embodiment of the present invention.

[0021] Figure 2 yes Figure 1 AA cross-sectional structure schematic diagram.

[0022] Figure 3 yes Figure 1 Schematic diagram of the BB cross-sectional structure.

[0023] Figure 4 yes Figure 1 Schematic diagram of the CC cross-sectional structure.

[0024] Figure 5 yes Figure 4 Schematic diagram of the local enlarged structure.

[0025] Figure 6 yes Figure 5 Schematic diagram of the GG cross-sectional structure.

[0026] Figure 7 yes Figure 1 Schematic diagram of DD cross-sectional structure.

[0027] Figure 8 yes Figure 7 A schematic diagram of the partially enlarged structure of the variable path hopper assembly.

[0028] Fig. 9 It is a schematic cross-sectional view of the connection between the second adjusting screw and the hopper side plate and the receiving plate.

[0029] In the figure: 1 is a first-stage belt conveyor, 101 is a redirecting roller, 102 is a tensioning fixed frame, 103 is a tensioning roller, 104 is a counterweight, 105 is a conveyor belt, 2 is an intermediate-stage belt conveyor, 3 is a final-stage belt conveyor, 4 is an adjusting device, 401 is a fixed seat, 402 is a first adjusting screw, 403 is a fixed rotating shaft, 404 is a first adjusting nut, 405 is a fixed support, 5 is a variable path hopper assembly, 501 is a material receiving plate, 502 is a rotating pin shaft 1, 503 is a rotating pin shaft 2, 504 is a pin shaft support, 505 is a hopper side plate, 506 is a second adjusting nut, 507 is an adjusting block, 508 is a second adjusting screw, 509 is an adjusting block fixing seat, and 6 is a slag receiving car. DETAILED DESCRIPTION

[0030] The following is a more detailed description of a TBM multi-stage slag discharge device and method of the present invention in conjunction with the accompanying drawings and through specific implementation methods.

[0031] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0032] See also Figure 1-Figure 9 The present embodiment discloses a TBM multi-stage slag discharge device, including a first-stage belt conveyor, an intermediate-stage belt conveyor and a final-stage belt conveyor. The three-stage belt conveyors all include a driving roller, a conveyor belt, a trough-shaped roller, a material guide trough, a lower roller, an adjustment device, a frame, a tail roller and a slag scraping device. The first-stage belt conveyor is arranged in the shield body of the TBM and is arranged as a retractable structure to adapt to the excavation and step-changing operation of the TBM equipment. Except for the tail trailer of the TBM, each trailer is arranged with an intermediate-stage belt conveyor. The intermediate-stage belt conveyor is divided into one or more belt conveyors according to the number of trailers. Spiral tensioning devices are installed on both sides of the head of each intermediate-stage belt conveyor. The head driving part of the first-stage belt conveyor and the tail slag receiving part of the adjacent intermediate-stage belt conveyor are overlapped up and down. The adjacent intermediate-stage belt conveyors are overlapped head-to-tail from front to back in accordance with the slag discharge direction. See Figure 3 , Figure 3 The invention discloses a structural schematic diagram of the head-tail overlap of a belt conveyor, wherein adjustment devices are installed on both sides of the head and tail of the intermediate belt conveyor for adjusting its positional relationship with a trailer; the final belt conveyor is arranged on the tail trailer, the tail of the final belt conveyor overlaps the head of the adjacent intermediate belt conveyor, and its head overlaps the slag receiving truck, and adjustment devices are installed on both sides of the head and tail of the final belt conveyor for adjusting its positional relationship with the tail trailer. The device has a compact and reasonable structure and saves space. The multi-stage conveyors are overlapped to shorten the length of each conveyor stage, thereby enhancing flexibility and turning ability. It can greatly reduce the deviation problem of the belt conveyor during curve excavation, reduce the failure rate of the conveyor, reduce maintenance costs, and improve construction progress. Adjustment devices are installed on the head and tail sides of the intermediate belt conveyor and the final belt conveyor to adjust their position relationship with the trailer, so that the front and rear belts can still overlap after the trailer turns, ensuring that the slag finally falls into the slag receiving truck, which can realize the rapid excavation of TBM equipment in the small curve area, solve the problem of slag excavation in small curves of TBM, break the application limitations of small curves of TBM, and expand the TBM application market.

[0033] See also Figure 4 , Figure 5 and Figure 6In this embodiment, preferably, the adjustment device includes a fixed seat, a first adjustment screw, a fixed support and a fixed rotating shaft. The fixed seat is fixedly connected to the belt frame. The first adjustment screw is arranged horizontally, and its inner end is hingedly connected to the fixed seat. The fixed support is fixedly connected to the trailer. The fixed rotating shaft is arranged vertically, and its bottom is hingedly connected in the fixed support. A radial hole is provided on the fixed rotating shaft. The outer end of the first adjustment screw passes through the radial hole on the fixed rotating shaft. A first adjustment nut is screwed on each side of the fixed rotating shaft on the first adjustment screw. Since the inner end of the first adjustment screw is hingedly connected to the fixed seat, and the fixed rotating shaft can also rotate relative to the fixed support, by adjusting the stroke difference of the first adjustment screws on the left and right sides, the fixed seat can be rotated and displaced relative to the fixed support, so that the position of the belt conveyor changes, adapts to the changes in the excavation curve, and can better meet the requirements of curved slag discharge.

[0034] See also Figure 7 , Figure 8 and Fig. 9 In this embodiment, preferably, both sides of the heads of the intermediate belt conveyor and the final belt conveyor are provided with variable path drop hopper assemblies for adjusting the trajectory of the slag falling and preventing the slag from spilling. The variable path drop hopper assembly includes a hopper side plate and a receiving plate. The inner end of the receiving plate is hingedly connected to the pin support on the inner side of the hopper side plate through a rotating pin shaft 2, and its outer end is connected to an angle adjustment mechanism arranged at the edge of the hopper side plate. The angle adjustment mechanism is used to adjust the inclination angle of the receiving plate relative to the hopper side plate. More preferably, the angle adjustment mechanism includes a second adjusting screw, an adjusting block and an adjusting block fixing seat. The adjusting block fixing seat is fixedly connected to the outer side of the hopper side plate, and the adjusting block is hingedly connected to the adjusting block fixing seat. The inner end of the second adjusting screw is hingedly connected to the outer end of the receiving plate through a rotating pin shaft 1, and its outer end passes through the through hole on the hopper side plate and then passes through the through hole on the adjusting block. A second adjusting nut is screwed on each side of the adjusting block on the second adjusting screw. By adjusting the position of the second adjusting nut on the second adjusting screw, the inclination angle of the receiving plate relative to the hopper side plate can be conveniently adjusted, thereby changing the falling trajectory of the debris falling downward to prevent spilling.

[0035] In this embodiment, preferably, a weight tensioning device is provided in the middle of the primary belt conveyor. The weight tensioning device is installed on the middle fixed frame and is located in front of the TBM equipment support shield. The relationship between the weight upward stroke H and the thrust cylinder extension stroke is designed to be 2H>L to avoid excessive tension of the conveyor belt. Figure 2 , Figure 2The invention discloses a structural schematic diagram of a weight tensioning device of a primary belt conveyor, wherein the weight tensioning device comprises a redirecting roller, a tensioning frame, a tensioning roller, a conveyor belt and a counterweight, wherein the redirecting roller is fixedly connected to the upper part of the tensioning frame, the tensioning roller is slidably connected to the lower part of the tensioning frame, and the counterweight is connected to the tensioning roller. The weight tensioning device can enable the primary belt conveyor to have a telescopic function, and the tensioning roller moves up and down on the tensioning frame under the traction of the conveyor belt, so as to compensate for the length change of the primary belt conveyor.

[0036] In this embodiment, preferably, a two-stage weight tensioning device is provided in the middle of the one-stage belt conveyor, so that the tensioning force of the one-stage belt conveyor is greater and the telescopic range is also greater.

[0037] In this embodiment, preferably, a mobile tail frame is provided at the tail of the first-stage belt conveyor, and the mobile tail frame is installed in the central axis area of ​​the main machine, and can move forward with the drive box during TBM excavation. When checking and changing the cutter, the tail frame can withdraw from the drive ring. A tail roller is installed on the mobile tail frame, and when the tail roller is working, it is located inside the main drive box and below the slag bucket to facilitate material receiving. A material guide trough is installed on the upper part of the tail roller, and the height of the material guide trough is lower than the lower part of the slag bucket, and the width is larger than the slag dropping area of ​​the slag bucket. The head drive device of the first-stage belt conveyor is fixedly connected to the support shield.

[0038] In this embodiment, after the TBM cutterhead breaks the rock, the slag falls into the first-stage belt conveyor through the slag collecting bucket, is transferred to the middle-stage belt conveyor through the first-stage belt conveyor, is transferred to the final-stage belt conveyor through the middle-stage belt conveyor, and is then transported to the slag receiving truck through the final-stage belt conveyor.

[0039] When the small curve turns right and tends to discharge slag, the redirection roller of the first-stage belt conveyor head is biased to the left, and the adjusting devices on the left and right sides of the intermediate-stage belt conveyor are adjusted to produce a stroke difference between the first adjusting screws on the left and right sides, so that the tail of the intermediate-stage belt conveyor is offset to the left and overlapped with the head and tail of the first-stage belt conveyor; at the same time, the variable path drop hopper assembly at the head of the first-stage belt conveyor is adjusted to open the receiving plate on its left side, change the drop trajectory, and drop slag to the middle material guide trough of the intermediate-stage belt conveyor to reduce the spillage of slag and stone; other intermediate-stage belt conveyors and the final-stage belt conveyor are fine-tuned accordingly according to the slag discharge requirements, and finally the slag can be guaranteed to fall into the slag receiving vehicle.

[0040] Similarly, when the small curve turns left and the slag is discharged in a broken line, the slag can be discharged smoothly by referring to the slag discharge method of the right-turn curve.

[0041] When the TBM equipment is excavating and changing steps, the propulsion cylinder in the main machine area is extended and retracted, and the first-level belt conveyor needs to have an extension and retraction function. Taking the extension of the propulsion cylinder of the TBM equipment excavation as an example, the tail frame of the first-level belt conveyor is fixedly installed together with the TBM equipment drive box, and the propulsion cylinder is extended to drive the tail frame to move forward. The length of the first-level belt conveyor increases, and the tensioning roller moves upward on the tensioning fixed frame under the traction of the conveyor belt to compensate for the change in the length of the first-level belt conveyor. The heavy hammer block moves up and down with the tensioning roller to ensure that the conveyor belt has sufficient tension to meet the operating conditions; conversely, when the propulsion cylinder retracts, the tensioning roller moves downward to reduce the length of the first-level belt conveyor.

[0042] The invention also discloses a TBM multi-stage slag discharge method, which uses any of the TBM multi-stage slag discharge devices described above to discharge slag.

[0043] Unless otherwise defined, the technical or scientific terms used herein shall have the usual meanings understood by persons of ordinary skill in the field to which the invention belongs. The use of "first", "second" and similar words in the specification and claims of this application does not indicate any order, quantity or importance, but is only used to distinguish different components. Similarly, the use of "one" or "an" and other similar words does not necessarily indicate a quantitative limitation. "Include" or "comprising" and other similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and other similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0044] The exemplary implementation modes of the present invention are described in detail above with reference to the preferred embodiments. However, it can be understood by those skilled in the art that, without departing from the concept of the present invention, various modifications and variations can be made to the above-mentioned specific embodiments, and various combinations of the technical features and structures proposed in the present invention can be made without exceeding the protection scope of the present invention.

Claims

1. A TBM multi-stage slag discharge device, characterized in that: include: A primary belt conveyor, which is arranged in the shield of the TBM and is configured as a retractable structure; Intermediate-stage belt conveyor: each trailer of the TBM except the rear trailer is provided with an intermediate-stage belt conveyor; the head driving part of the first-stage belt conveyor and the tail slag receiving part of the adjacent intermediate-stage belt conveyor are overlapped up and down; the adjacent intermediate-stage belt conveyors are overlapped head-to-tail in sequence from front to back according to the slag discharge direction; the intermediate-stage belt conveyor is installed with adjustment devices on both sides of the head and tail to adjust its positional relationship with the trailer; and The final belt conveyor is arranged on the tail trailer, the tail of the final belt conveyor overlaps with the head of the adjacent intermediate belt conveyor, and the head overlaps with the slag receiving vehicle. Adjustment devices are installed on both sides of the head and tail of the final belt conveyor to adjust the position relationship between it and the tail trailer; Both sides of the heads of the intermediate belt conveyor and the final belt conveyor are provided with variable path drop hopper assemblies for adjusting the trajectory of the slag falling. The variable path drop hopper assembly comprises a hopper side plate and a receiving plate. The inner end of the receiving plate is hingedly connected to the inner side of the hopper side plate through a rotating pin shaft, and the outer end thereof is connected to an angle adjustment mechanism arranged at the edge of the hopper side plate. The angle adjustment mechanism is used to adjust the inclination angle of the receiving plate relative to the hopper side plate. The angle adjustment mechanism includes a second adjustment screw, an adjustment block and an adjustment block fixing seat, the adjustment block fixing seat is fixedly connected to the outer side of the hopper side plate, the adjustment block is hingedly connected to the adjustment block fixing seat, the inner end of the second adjustment screw is hingedly connected to the outer end of the receiving plate through a rotating pin shaft, and the outer end thereof passes through the through hole on the hopper side plate and then passes through the through hole on the adjustment block, and a second adjustment nut is screwed on each side of the adjustment block on the second adjustment screw; The adjusting device includes a fixed seat, a first adjusting screw, a fixed support and a fixed rotating shaft. The fixed seat is fixedly connected to the belt frame. The first adjusting screw is horizontally arranged and its inner end is hingedly connected to the fixed seat. The fixed support is fixedly connected to the trailer. The fixed rotating shaft is vertically arranged and its bottom is hingedly connected to the fixed support. A radial hole is provided on the fixed rotating shaft. The outer end of the first adjusting screw passes through the radial hole on the fixed rotating shaft. A first adjusting nut is screwed on each side of the fixed rotating shaft on the first adjusting screw.

2. A TBM multi-stage slag discharge device according to claim 1, characterized in that: A weight tensioning device is provided in the middle part of the first-level belt conveyor, and the weight tensioning device is installed on the middle fixed frame and is located in front of the TBM equipment support shield. The weight tensioning device includes a redirecting roller, a tensioning fixed frame, a tensioning roller, a conveyor belt and a counterweight. The redirecting roller is fixedly connected to the upper part of the tensioning fixed frame, the tensioning roller is slidably connected to the lower part of the tensioning fixed frame, and the counterweight is connected to the tensioning roller.

3. A TBM multi-stage slag discharge device according to claim 2, characterized in that: A two-stage weight tensioning device is arranged in the middle of the one-stage belt conveyor.

4. A TBM multi-stage slag discharge device according to claim 1, characterized in that: A movable tail frame is provided at the tail of the primary belt conveyor, and the movable tail frame is installed in the central axis area of ​​the main machine.

5. A TBM multi-stage slag discharge device according to claim 4, characterized in that: The movable tail frame is provided with a tail roller, which is located inside the main drive box and below the slag collecting bucket when in operation; the upper part of the tail roller is provided with a material guide trough, which is lower than the lower part of the slag collecting bucket and wider than the slag dropping area of ​​the slag collecting bucket.

6. A TBM multi-stage slag discharge device according to claim 1, characterized in that: The head driving device of the primary belt conveyor is fixedly connected to the supporting shield.

7. A TBM multi-stage slag discharge method, characterized in that: Slag is discharged using the TBM multi-stage slag discharge device described in any one of claims 1 to 6.

Images