Mud flow control system for shield tunneling machine and shield tunneling machine with same

Abstract

The utility model discloses a kind of slurry flow control system for shield machine and shield machine with it, comprising: the slurry cabin of being laid in the shield body of shield machine, and the transition cabin, grouting system and slurry discharge system of being laid outside shield machine, and air pressure control system. Transition cabin is equipped with liquid level detector for detecting the liquid level in it and first pressure detector for detecting the pressure in it, and transition cabin is connected with air pressure control system to adjust the air pressure in it, and transition cabin is also connected with slurry cabin, to control slurry cabin pressure by slurry pressure and air pressure in transition cabin, and then make slurry cabin pressure match face water and soil pressure. Transition cabin and slurry cabin are also connected with grouting system to inject slurry respectively, and slurry cabin is also connected with slurry discharge system to discharge slurry outward. The new system can ensure the stability of liquid level and air pressure in transition cabin, and then control the stability of slurry cabin pressure, so that slurry cabin pressure matches face water and soil pressure.

Description

Technical Field

[0001] This utility model relates to the field of micro tunnel boring machine (TBM) technology, and in particular, to a slurry flow control system for a TBM. Furthermore, this utility model also relates to a TBM including the aforementioned slurry flow control system. Background Technology

[0002] Tunnel boring machines (TBMs) need to operate under varying water and soil pressures, which means that the flow rate must be kept stable under different slurry discharge pressures. When the pressure difference between different operating conditions is too large, the control accuracy of using the same flow regulating valve will be significantly reduced.

[0003] For example, in patents CN118936941B and CN118622303A (slurry discharge control method and shield equipment), although the particle tolerance of flow control is improved by means of separation boxes, if we rely solely on damping and other means, in order to apply to various working conditions, we need to test and calculate a large number of damping combination working conditions, which is quite cumbersome for actual engineering.

[0004] In addition, in patent CN118936941B, the air cushion chamber of the tunnel boring machine lacks measuring equipment such as a level gauge, which makes it impossible to accurately control the stability of the liquid level. As a result, the pressure in the slurry chamber is unstable and does not match the water and soil pressure in front. At the same time, it causes the pressure in the slurry discharge pipeline to be unstable, and the pre-set damping cannot control the flow rate to be stable, leading to tunneling failure. Utility Model Content

[0005] This utility model provides a mud flow control system for tunnel boring machines and a tunnel boring machine with the same, in order to solve the technical problem that existing tunnel boring equipment lacks measuring equipment such as level gauges, which makes it impossible to accurately control the stability of the liquid level, resulting in unstable pressure in the mud chamber and mismatch with the water and soil pressure in front.

[0006] The technical solution adopted in this utility model is as follows:

[0007] A mud flow control system for a tunnel boring machine (TBM) includes: a mud-water chamber installed inside the TBM shield, and a transition chamber, a grouting system, and a slurry discharge system installed outside the TBM, as well as an air pressure control system. The transition chamber is equipped with a level detector for detecting the liquid level and a first pressure detector for detecting the internal pressure. The transition chamber is connected to the air pressure control system to regulate the internal air pressure. The transition chamber is also connected to the mud-water chamber to control the pressure of the mud-water chamber through the mud pressure and air pressure inside the transition chamber, thereby matching the pressure of the mud-water chamber to the soil and water pressure at the tunnel face. The transition chamber and the mud-water chamber are also connected to the grouting system to inject mud, and the mud-water chamber is also connected to the slurry discharge system to discharge slurry outwards.

[0008] Furthermore, the air pressure control system includes an air source and a transition chamber pressure holding system connected to the air source. The transition chamber pressure holding system is connected to the transition chamber for introducing air into the transition chamber or discharging gas from the transition chamber to the outside, thereby regulating the pressure in the transition chamber.

[0009] Furthermore, the transition chamber pressure holding system includes a first air inlet pipe connecting the air source and the transition chamber, a first exhaust pipe connecting the transition chamber and the atmosphere, an air inlet valve installed in the first air inlet pipe, and an exhaust valve installed in the first exhaust pipe.

[0010] Furthermore, the mud and water chamber is also connected to an overflow pipe, the top of which is located above the shield body, and a level switch is installed at the top of the overflow pipe; the mud and water chamber is also equipped with a second pressure detector for detecting its internal pressure; the mud and water chamber is also connected to a transition chamber through a connecting pipe, and a first switch valve is installed in the connecting pipe.

[0011] Furthermore, the grouting system includes a mud-water tank, a main grout supply pipe, a first grout delivery branch pipe and a second grout delivery branch pipe, a delivery pump, a first flow meter, a second switch valve, and a third switch valve. The inlet end of the main grout supply pipe is connected to the mud-water tank, and the outlet end of the main grout supply pipe is connected to the inlet ends of the first and second grout delivery branch pipes, respectively. The outlet end of the first grout delivery branch pipe is connected to the mud-water chamber, and the outlet end of the second grout delivery branch pipe is connected to the transition chamber. The delivery pump and the first flow meter are sequentially installed in the pipeline of the main grout supply pipe. The second switch valve is installed in the first grout delivery branch pipe, and the third switch valve is installed in the second grout delivery branch pipe.

[0012] Furthermore, the slurry discharge system includes a separation box connected to the mud-water tank, a slag box for holding the separated slag, a slag discharge pipe connected between the separation box and the slag box, and a flow control valve and a second flow meter sequentially installed in the slag discharge pipe; the separation box is also connected to the mud-water tank to discharge the separated slurry into the mud-water tank.

[0013] Furthermore, the slag container is also equipped with a third pressure detector for detecting its internal pressure; the air pressure control system also includes a slag container pressure holding system that connects the air source and the slag container. The slag container pressure holding system is used to adjust the pressure of the slag container so that the pressure difference between the slag container and the transition chamber is maintained at a set value.

[0014] Furthermore, the slag box pressure maintenance system includes a pressure regulating circuit connecting the air source and the slag box, and a pressure reducing valve installed in the pressure regulating circuit; the exhaust end of the pressure regulating circuit is connected to the atmosphere.

[0015] Furthermore, the slag box pressure maintenance system includes a second air inlet pipe connecting the air source and the slag box, a second exhaust pipe connecting the slag box and the atmosphere, a fourth switch valve installed in the second air inlet pipe, and an overflow valve installed in the second exhaust pipe.

[0016] According to another aspect of the present invention, a tunnel boring machine is also provided, having a slurry flow control system for a tunnel boring machine as described in any of the above.

[0017] This utility model has the following beneficial effects:

[0018] This utility model relates to a mud flow control system, such as... Figure 1 As shown, an additional transition chamber is set up outside the existing air cushion chamber and slurry chamber. The transition chamber is connected to the air pressure control system for internal pressure control, to the grouting system for grouting, and also connected to the slurry chamber. The transition chamber is equipped with a level detector for detecting the liquid level and a first pressure detector for detecting the internal pressure. Through the monitoring of the level detector and the first pressure detector, the liquid level and air pressure in the transition chamber can be kept stable, thereby controlling the pressure in the slurry chamber to be stable and matching the pressure in the slurry chamber with the water and soil pressure at the working face. On the other hand, the external transition chamber acts as an air cushion chamber, which can better measure the slurry level inside and, combined with the function of the air pressure control system, can accurately control the pressure inside the slurry chamber. At the same time, the external transition chamber can be set to a larger volume, and the larger volume controlled by the air pressure control system is more conducive to pressure stability control. It is also easier to control the transition chamber to be "half-chambered", avoiding the collapse of the working face due to pressure mismatch when the air pressure control system is loaded.

[0019] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The present utility model will now be described in further detail with reference to the figures. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0021] Figure 1 This is a schematic diagram of a preferred embodiment of the mud flow control system for a tunnel boring machine.

[0022] Figure 2 This is a diagram showing the state of a conventional tunnel boring machine (TBM) during tunneling.

[0023] Figure 3 yes Figure 1 Schematic diagram of medium-pressure control system;

[0024] Figure 4 This is a schematic diagram of an alternative solution for the soil compactor pressure holding system.

[0025] Legend:

[0026] 1. Shield body; 11. Mud and water chamber; 12. Overflow pipe; 13. Second pressure detector; 14. First switch valve; 15. Air cushion chamber; 2. Transition chamber; 21. Liquid level detector; 22. First pressure detector;

[0027] 3. Air pressure control system; 31. Air source; 32. Transition chamber pressure holding system; 321. Inlet valve; 322. Exhaust valve; 33. Slag box pressure holding system; 331. Pressure reducing valve; 332. Fourth switching valve; 333. Overflow valve;

[0028] 4. Grouting system; 41. Slurry tank; 42. Conveying pump; 43. First flow meter; 44. Second switching valve; 45. Third switching valve;

[0029] 5. Slurry discharge system; 51. Separation box; 52. Slag box; 53. Flow control valve; 54. Second flow meter; 55. Third pressure detector. Detailed Implementation

[0030] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0031] Reference Figure 1 A preferred embodiment of this utility model provides a mud flow control system for a tunnel boring machine (TBM), comprising: a mud-water chamber 11 installed inside the TBM shield body 1, a transition chamber 2, a grouting system 4, and a slurry discharge system 5 installed outside the TBM, and a pneumatic control system 3. The transition chamber 2 is equipped with a level detector 21 for detecting the liquid level and a first pressure detector 22 for detecting the internal pressure. The transition chamber 2 is connected to the pneumatic control system 3 to regulate its internal air pressure. The transition chamber 2 is also connected to the mud-water chamber 11, so that the pressure of the mud-water chamber 11 is controlled by the mud pressure and air pressure within the transition chamber 2, thereby matching the pressure of the mud-water chamber 11 to the soil and water pressure at the tunnel face. The transition chamber 2 and the mud-water chamber 11 are also respectively connected to the grouting system 4 to inject mud, and the mud-water chamber 11 is also connected to the slurry discharge system 5 to discharge slurry outwards.

[0032] Current shield tunneling status as follows Figure 2 As shown, the shield gradually enters the soil layer during tunneling. In traditional slurry shield tunneling schemes, the pressure in the slurry chamber is controlled by controlling the pressure in the air cushion chamber half-chamber and the air pressure in the air cushion chamber. Because the air cushion chamber needs to gradually enter the soil layer, it is impossible to install measuring equipment such as level gauges that require vertical installation. Therefore, controlling the liquid level in the air cushion chamber is difficult and the accuracy of liquid level control is low. In addition, due to the small diameter of the shield, the connecting pipe valve cannot be arranged between the slurry chamber and the air cushion chamber to connect the two. Therefore, controlling the liquid level in the half-chamber before tunneling is also quite difficult.

[0033] This utility model relates to a mud flow control system, such as... Figure 1As shown, a transition chamber 2 is additionally installed outside the existing air cushion chamber and mud-water chamber 11. The transition chamber 2 is connected to the air pressure control system 3 for internal pressure control, connected to the grouting system 4 for grouting, and also connected to the mud-water chamber 11. The transition chamber 2 is also equipped with a level detector 21 for detecting the liquid level and a first pressure detector 22 for detecting the internal pressure. Through the monitoring of the level detector 21 and the first pressure detector 22, the liquid level and air pressure in the transition chamber 2 can be kept stable, thereby controlling the pressure in the mud-water chamber 11 to remain stable. The pressure of the 11-mud chamber is matched with the water and soil pressure at the working face. On the other hand, the external transition chamber 2 acts as an air cushion chamber, which can better measure the mud level inside and, in conjunction with the air pressure control system 3, can accurately control the pressure inside the mud chamber 11. At the same time, the external transition chamber 2 can be set to a larger volume, and the air pressure control system 3 can control a larger volume, which is more conducive to controlling the pressure stability and also makes it easier to control the transition chamber 2 to be "half-chambered", avoiding the collapse of the working face due to pressure mismatch when the air pressure control system 3 is loaded.

[0034] Optionally, such as Figure 1 As shown, the air pressure control system 3 includes an air source 31 and a transition chamber pressure holding system 32 connected to the air source 31. The transition chamber pressure holding system 32 is connected to the transition chamber 2 and is used to ventilate the transition chamber 2 or to discharge the gas in the transition chamber 2 to the outside, thereby regulating the pressure in the transition chamber 2.

[0035] In this optional solution, such as Figure 3 As shown, the transition chamber pressure-maintaining system 32 includes a first air inlet pipe connecting the air source 31 and the transition chamber 2, a first exhaust pipe connecting the transition chamber 2 and the atmosphere, an air inlet valve 321 installed in the first air inlet pipe, and an exhaust valve 322 installed in the first exhaust pipe. During operation, the shield machine's control system can obtain the pressure applied to the mud chamber 11 by the water and soil pressure at the working face. Consequently, the shield machine's control system controls the air pressure control system 3 to operate accordingly, either by supplying air to the transition chamber 2 through the air inlet valve 321 to increase pressure, or by venting air to the atmosphere through the exhaust valve 322 to reduce pressure, thereby regulating and stabilizing the air pressure inside the transition chamber 2.

[0036] Preferably, such as Figure 1 As shown, the mud tank 11 is also connected to an overflow pipe 12. The top of the overflow pipe 12 is located above the shield body 1, and a level switch is also installed at the top of the overflow pipe 12. When the level switch sounds an alarm, it indicates that the mud in the overflow pipe 12 is about to overflow or has already overflowed, which means that the mud tank 11 is full, thus preventing the mud tank 11 from being insufficiently full during tunneling and affecting the tunneling quality. The mud tank 11 is also equipped with a second pressure detector 13 for detecting its internal pressure. The mud tank 11 is also connected to the transition tank 2 through a connecting pipe, and a first switching valve 14 is installed in the connecting pipe.

[0037] Preferably, such as Figure 1As shown, the air cushion chamber 15 can be omitted, or the mud and water chamber 11 can be connected with the air cushion chamber 15 to form a whole, increasing the volume of the mud and water chamber 11 and thus improving the stability under stress.

[0038] Optionally, such as Figure 1 As shown, the grouting system 4 includes a mud-water tank 41, a main grout supply pipe, a first grout delivery branch pipe, a second grout delivery branch pipe, a delivery pump 42, a first flow meter 43, a second switching valve 44, and a third switching valve 45. The inlet end of the main grout supply pipe is connected to the mud-water tank 41, and the outlet end of the main grout supply pipe is connected to the inlet ends of the first and second grout delivery branch pipes respectively. The outlet end of the first grout delivery branch pipe is connected to the mud-water chamber 11, and the outlet end of the second grout delivery branch pipe is connected to the transition chamber 2. The delivery pump 42 and the first flow meter 43 are sequentially installed in the pipeline of the main grout supply pipe. The second switching valve 44 is installed in the first grout delivery branch pipe, and the third switching valve 45 is installed in the second grout delivery branch pipe. During operation, close the first switch valve 14 and open the second switch valve 44 to inject grout into the mud and water chamber 11 until the liquid level switch at the top of the overflow pipe 12 alarms or mud flows out from the top of the overflow pipe 12; at the same time, open the third switch valve 45 to inject grout into the transition chamber 2 until the intermediate liquid level is reached, and then control the pressure holding system 32 of the transition chamber to match the water and soil pressure in front before opening the first switch valve 14.

[0039] Optionally, such as Figure 1 As shown, the slurry discharge system 5 includes a separation tank 51 connected to the slurry tank 11, a slurry tank 52 for holding the separated slurry, a slurry discharge pipe connected between the separation tank 51 and the slurry tank 52, and a flow control valve 53 and a second flow meter 54 sequentially arranged in the slurry discharge pipe. The separation tank 51 is also connected to the slurry tank 41 to discharge the separated slurry into the slurry tank 41. In this optional embodiment, the flow control valve 53 controls the slurry discharge flow rate, which can be proportionally adjusted or set with different fixed damping combinations.

[0040] During operation, the working conditions of miniature shield tunnels are highly variable. In addition to the wide range of pressure at the tunnel face in water-soil shield tunneling, high flow control accuracy is also required. To reduce the control difficulty, in the preferred embodiment of this utility model, such as... Figure 1As shown, the muck box 52 is also equipped with a third pressure detector 55 for detecting its internal pressure. The air pressure control system 3 also includes a muck box pressure maintaining system 33 connecting the air source 31 and the muck box 52. The muck box pressure maintaining system 33 is used to regulate the pressure of the muck box 52 so that the pressure difference between the muck box 52 and the transition chamber 2 is maintained at a set value. During shield tunneling, the pressure difference between the transition chamber pressure maintaining system 32 and the muck box pressure maintaining system 33 is kept stable. For example, the pressure in the transition chamber 2 is stable at 10 bar, and the pressure in the muck box 52 is stable at 5 bar, keeping the pressure difference constant. This controls the pressure difference between the slurry chamber 11 and the muck box 52 to be stable, thus ensuring that the flow control valve 53 can have high control accuracy even under different water and soil pressure conditions, improving flow control accuracy, and expanding the operating range of the shield tunneling device.

[0041] In this optional solution, the first embodiment of the slag box pressure-maintaining system 33 is as follows: Figure 3 As shown, the spoil box pressure-maintaining system 33 includes a pressure regulating circuit connecting the air source 31 and the spoil box 52, and a pressure reducing valve 331 installed in the pressure regulating circuit. The exhaust end of the pressure regulating circuit is connected to the atmosphere. During operation, the tunnel boring machine's control system controls the spoil box pressure-maintaining system 33 to operate according to the air pressure in the transition chamber pressure-maintaining system 32, so as to introduce air into the spoil box 52 through the pressure reducing valve 331 to increase pressure or exhaust air to reduce pressure, thereby regulating and stabilizing the pressure inside the spoil box 52.

[0042] In this optional solution, the second embodiment of the slag box pressure-maintaining system 33 is as follows: Figure 4 As shown, the muck box pressure-maintaining system 33 includes a second air inlet pipe connecting the air source 31 and the muck box 52, a second exhaust pipe connecting the muck box 52 and the atmosphere, a fourth switch valve 332 installed in the second air inlet pipe, and an overflow valve 333 installed in the second exhaust pipe. During operation, the tunnel boring machine's control system controls the air pressure in the muck box 52 according to the air pressure in the transition chamber pressure-maintaining system 32, causing the muck box pressure-maintaining system 33 to activate. This involves either increasing the pressure by introducing air into the muck box 52 through the second air inlet pipe or decreasing the pressure by releasing air outwards through the second exhaust pipe, thereby regulating and stabilizing the pressure inside the muck box 52. During operation, the fourth switch valve 332 is opened before tunneling to increase pressure until the overflow valve 333 opens, and then the fourth switch valve 332 is closed, stabilizing the pressure in the muck box 52 at the opening pressure of the overflow valve 333.

[0043] In actual operation, if changes occur in the excavated soil layer, causing a large change in the flow rate within the flow control valve 53, the pressure difference between the transition chamber 2 and the muck box 52 can be reduced or increased as needed. Maintaining a stable pressure difference between the transition chamber pressure-holding system 32 and the muck box pressure-holding system 33 during shield tunneling ensures high control accuracy for the flow control valve 53 even under varying soil and water pressure conditions.

[0044] A preferred embodiment of this utility model also provides a tunnel boring machine (TBM) with a slurry flow control system as described above. This TBM, through monitoring by the level detector 21 and the first pressure detector 22, can ensure stable liquid level and air pressure within the transition chamber 2, thereby controlling the pressure of the slurry chamber 11 to be stable and matching the pressure of the tunnel face. Simultaneously, it can better measure the slurry level within the transition chamber 2, and combined with the function of the air pressure control system 3, can precisely control the pressure within the slurry chamber 11. Furthermore, the externally mounted transition chamber 2 can be configured with a larger volume, allowing the air pressure control system 3 to control a larger volume, which is more conducive to pressure stability and makes it easier to control the transition chamber 2 to be in a "half-chamber" state, avoiding tunnel face collapse due to pressure mismatch when the air pressure control system 3 is loaded.

[0045] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A mud flow control system for a tunnel boring machine, characterized in that, include: The mud and water chamber (11) is installed inside the shield body (1) of the tunnel boring machine, and the transition chamber (2), grouting system (4) and grout discharge system (5) are installed outside the tunnel boring machine, as well as the air pressure control system (3). The transition chamber (2) is equipped with a liquid level detector (21) for detecting the liquid level inside and a first pressure detector (22) for detecting the pressure inside. The transition chamber (2) is connected to a pneumatic control system (3) to regulate the pneumatic pressure inside. The transition chamber (2) is also connected to a mud and water chamber (11) to control the pressure of the mud and water chamber (11) through the mud pressure and pneumatic pressure inside the transition chamber (2), thereby matching the pressure of the mud and water chamber (11) with the soil and water pressure at the working face. The transition chamber (2) and the mud-water chamber (11) are also connected to the grouting system (4) to inject mud slurry respectively, and the mud-water chamber (11) is also connected to the slurry discharge system (5) to discharge slurry outward.

2. The slurry flow control system for tunnel boring machines according to claim 1, characterized in that, The air pressure control system (3) includes an air source (31) and a transition chamber pressure holding system (32) connected to the air source (31). The transition chamber pressure holding system (32) is connected to the transition chamber (2) to allow air to enter the transition chamber (2) or to allow the gas in the transition chamber (2) to be discharged outward, thereby regulating the pressure in the transition chamber (2).

3. The slurry flow control system for tunnel boring machines according to claim 2, characterized in that, The transition chamber pressure holding system (32) includes a first air inlet pipe connecting the air source (31) and the transition chamber (2), a first exhaust pipe connecting the transition chamber (2) and the atmosphere, an air inlet valve (321) installed in the first air inlet pipe, and an exhaust valve (322) installed in the first exhaust pipe.

4. The slurry flow control system for tunnel boring machines according to claim 1, characterized in that, The mud and water tank (11) is also connected to an overflow pipe (12). The top of the overflow pipe (12) is located above the shield body (1), and a liquid level switch is provided at the top of the overflow pipe (12). The mud and water chamber (11) is also equipped with a second pressure detector (13) for detecting its internal pressure; The mud and water chamber (11) is also connected to the transition chamber (2) via a connecting pipe, and a first switch valve (14) is provided in the connecting pipe.

5. The slurry flow control system for tunnel boring machines according to claim 1, characterized in that, The grouting system (4) includes a mud tank (41), a grout supply main pipe, a first grout delivery branch pipe and a second grout delivery branch pipe, a delivery pump (42), a first flow meter (43), a second switch valve (44) and a third switch valve (45); The slurry inlet end of the slurry supply main pipe is connected to the mud and water tank (41), the slurry outlet end of the slurry supply main pipe is connected to the slurry inlet end of the first slurry delivery branch pipe and the second slurry delivery branch pipe respectively, the slurry outlet end of the first slurry delivery branch pipe is connected to the mud and water chamber (11), and the slurry outlet end of the second slurry delivery branch pipe is connected to the transition chamber (2). The delivery pump (42) and the first flow meter (43) are sequentially installed in the pipeline of the slurry supply main pipe; The second switch valve (44) is installed in the first slurry branch pipe, and the third switch valve (45) is installed in the second slurry branch pipe.

6. The slurry flow control system for tunnel boring machines according to claim 2, characterized in that, The slurry discharge system (5) includes a separation box (51) connected to the mud and water tank (11), a slag box (52) for holding the separated slag, a slag discharge pipe connected between the separation box (51) and the slag box (52), a flow control valve (53) and a second flow meter (54) arranged in sequence in the slag discharge pipe. The separation tank (51) is also connected to the mud tank (41) to discharge the separated mud into the mud tank (41).

7. The slurry flow control system for tunnel boring machines according to claim 6, characterized in that, The slag container (52) is also equipped with a third pressure detector (55) for detecting the internal pressure; The air pressure control system (3) also includes a slag box pressure holding system (33) that connects the air source (31) and the slag box (52). The slag box pressure holding system (33) is used to adjust the pressure of the slag box (52) so that the pressure difference between the slag box (52) and the transition chamber (2) is maintained at a set value.

8. The slurry flow control system for tunnel boring machines according to claim 7, characterized in that, The pressure-maintaining system (33) for the slag container includes a pressure regulating circuit connecting the air source (31) and the slag container (52), and a pressure reducing valve (331) installed in the pressure regulating circuit; The exhaust end of the pressure regulating circuit is connected to the atmosphere.

9. The slurry flow control system for tunnel boring machines according to claim 7, characterized in that, The slag box pressure holding system (33) includes a second air inlet pipe connecting the air source (31) and the slag box (52), a second exhaust pipe connecting the slag box (52) and the atmosphere, a fourth switch valve (332) installed in the second air inlet pipe, and an overflow valve (333) installed in the second exhaust pipe.

10. A tunnel boring machine, characterized in that, It has a slurry flow control system for tunnel boring machines as described in any one of claims 1-9.

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