Shield machine, flushing device and mud circulation system

Abstract

The present invention discloses a shield machine, a flushing device and a mud circulation system. The mud circulation system includes a slurry inlet pipeline and a slurry inlet pump. The slurry inlet pipeline is connected to a left bentonite nozzle pipeline and a right bentonite nozzle pipeline. The left bentonite nozzle pipeline and the right bentonite nozzle pipeline are respectively connected to the left bentonite nozzle and the right bentonite nozzle and are connected to an air cushion chamber. The angle between the normal line of the left bentonite nozzle and the vertical direction is smaller than the angle between the line connecting the outlet center point of the left bentonite nozzle and the center point of the shield body bottom and the vertical direction. The angle between the normal line of the right bentonite nozzle and the vertical direction is smaller than the angle between the line connecting the outlet center point of the right bentonite nozzle and the center point of the shield body bottom and the vertical direction. The above-mentioned mud circulation system flushes the mud on the bottom of the chamber at an angle deviated from the center of the shield body bottom by the left bentonite nozzle and the right bentonite nozzle, which can greatly improve the system's slag carrying capacity and flushing effect, thereby achieving rapid slag discharge and reducing blockage of the slurry discharge port.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering machinery, and in particular to a shield machine, a flushing device and a mud circulation system. Background Art

[0002] The flushing device of the existing conventional shield machine has a low slag carrying capacity and poor flushing effect, especially at the slurry discharge port, which is prone to accumulation, causing blockage of the shield machine's excavation chamber or air cushion chamber. When a lot of mud and slag accumulates at the bottom, it is necessary to stop excavation and perform backwashing circulation of the mud pipeline. Once too much mud and slag accumulates, manual entry is required to clear the slag, delaying normal excavation work and thus affecting work efficiency.

[0003] Therefore, how to avoid the influence on tunneling efficiency caused by the low slag carrying capacity and poor flushing effect of the flushing device of the shield machine is a technical problem that technical personnel in this field need to solve at present. Summary of the Invention

[0004] The purpose of the present invention is to provide a shield machine, a flushing device and a mud circulation system, which can solve the problems of low flushing efficiency, low slag carrying rate, and excessive accumulation of crushed stones at the bottom of the bin, which causes stagnation of the excavation and slag discharge system.

[0005] To achieve the above-mentioned objectives, the present invention provides a mud circulation system, comprising a slurry inlet pipeline and a slurry inlet pump connected to the slurry inlet pipeline, the slurry inlet pipeline being connected to a left bentonite nozzle pipeline and a right bentonite nozzle pipeline, the left bentonite nozzle pipeline and the right bentonite nozzle pipeline being connected to the left bentonite nozzle and the right bentonite nozzle respectively, and being connected to an air cushion chamber; the angle between the normal of the left bentonite nozzle and the vertical direction is smaller than the angle between the line connecting the center point of the outlet of the left bentonite nozzle and the center point of the bottom of the shield body and the vertical direction, and the angle between the normal of the right bentonite nozzle and the vertical direction is smaller than the angle between the line connecting the center point of the outlet of the right bentonite nozzle and the center point of the bottom of the shield body and the vertical direction.

[0006] Optionally, the slurry inlet pipeline is further connected to a left bentonite pipeline and a right bentonite pipeline, and the left bentonite pipeline and the right bentonite pipeline are respectively connected to a left bentonite outlet and a right bentonite outlet, and are connected to an excavation chamber.

[0007] Optionally, the slurry inlet pipeline is also connected to a left bentonite flushing pipeline and a right bentonite flushing pipeline, and the left bentonite flushing pipeline and the right bentonite flushing pipeline are respectively connected to a left bentonite flushing port and a right bentonite flushing port, and are connected to the excavation chamber.

[0008] Optionally, the slurry inlet pipeline is further connected to a cutterhead center flushing pipeline and a cutterhead center flushing pump, and the cutterhead center flushing pipeline is connected to a center flushing port and is connected to the excavation chamber.

[0009] Optionally, it further includes a slurry discharge pipeline and a slurry discharge pump connected to the slurry discharge pipeline, and the slurry discharge pipeline is connected to the slurry discharge port and is connected to the air cushion chamber.

[0010] Optionally, the slurry inlet pipeline is also connected to a grille flushing pipeline, which is connected to the grille flushing port and connected to the air cushion bin; the grille flushing port is located obliquely above the slurry discharge port, and the grille flushing port is provided with a bent pipe for flushing the slurry discharge port to prevent the slurry discharge port from being blocked.

[0011] Optionally, a backwash slurry discharge pipeline connected to the slurry discharge pipeline is further included, the backwash slurry discharge pipeline is connected to the backwash slurry suction port and connected to the air cushion bin; the height of the backwash slurry suction port is greater than the height of the slurry discharge port.

[0012] Optionally, a backwashing slurry inlet pipeline is further included, and both ends of the backwashing slurry inlet pipeline are respectively connected to the slurry inlet pipeline and the backwashing slurry discharge pipeline.

[0013] The present invention also provides a flushing device comprising any one of the above-mentioned mud circulation systems.

[0014] The present invention also provides a shield machine, comprising the flushing device described above.

[0015] With respect to the above-mentioned background technology, the mud circulation system provided in the embodiment of the present invention includes a slurry feed pipeline and a slurry feed pump, wherein the slurry feed pump is connected to the slurry feed pipeline, and the slurry feed pipeline is connected to a left bentonite nozzle pipeline and a right bentonite nozzle pipeline. The left bentonite nozzle pipeline and the right bentonite nozzle pipeline are respectively connected to the left bentonite nozzle and the right bentonite nozzle, and are connected to the air cushion chamber. Furthermore, the angle between the normal of the left bentonite nozzle and the vertical direction is smaller than the angle between the line connecting the center point of the outlet of the left bentonite nozzle and the center point of the bottom of the shield and the vertical direction, and the angle between the normal of the right bentonite nozzle and the vertical direction is smaller than the angle between the line connecting the center point of the outlet of the right bentonite nozzle and the center point of the bottom of the shield and the vertical direction.

[0016] In this way, during the tunneling process of the shield machine, the left bentonite nozzle and the right bentonite nozzle both flush the soil at the bottom of the bin at an angle offset from the center of the bottom of the shield body. The mud bounces off the bottom of the bin along the trajectory of the nozzle spray and enters the slurry outlet. Under the lifting and suction action of the water flow, the mud at the bottom of the bin is quickly gathered and brought into the slurry outlet, which can greatly improve the slag carrying efficiency of the flushing pipe. Compared with the traditional mud circulation system with low slag carrying capacity and poor flushing effect, the mud circulation system provided by the embodiment of the present invention flushes the soil at the bottom of the bin at an angle offset from the center of the bottom of the shield body by the left bentonite nozzle and the right bentonite nozzle, so that the mud is gathered toward the slurry outlet and quickly enters the slurry outlet through the suction action. This can greatly improve the slag carrying capacity and flushing effect of the system, thereby realizing efficient and rapid slag discharge of the shield machine during tunnel excavation, reducing the blockage of the slurry outlet, and reducing the construction risk caused by the shutdown of the shield machine, thereby improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0018] Figure 1 A schematic diagram of the flushing of the left bentonite nozzle and the right bentonite nozzle in the mud circulation system provided by an embodiment of the present invention;

[0019] Figure 2 A schematic diagram of the pipeline connection of the mud circulation system provided in an embodiment of the present invention;

[0020] Figure 3 Schematic diagram of the distribution of the left bentonite outlet, the right bentonite outlet, the center flushing port, the left bentonite flushing port, and the right bentonite flushing port;

[0021] Figure 4 This is a distribution diagram of the left bentonite nozzle, right bentonite nozzle, grid flushing port, slurry discharge port and backwash slurry suction port.

[0022] in:

[0023] 1- Excavation chamber, 2- Submerged wall, 3- Air cushion chamber, 4- Isolation wall, 5- Cutterhead center flushing pump, 6- Slurry feed pump, 7- Backwash slurry feed pipeline, 8- Slurry feed pipeline, 9- Excavation face, 101- Left bentonite pipeline, 102- Right bentonite pipeline, 11- Cutterhead center flushing pipeline, 121- Left bentonite flushing pipeline, 122- Right bentonite flushing pipeline, 131- Left bentonite nozzle pipeline, 132- Right bentonite nozzle pipeline, 14- Grid flushing pipeline, 15- Backwash slurry discharge pipeline, 16- Slurry discharge pump, 17- Slurry discharge pipeline;

[0024] 1011-left bentonite outlet, 1021-right bentonite outlet, 110-center flushing port, 1211-left bentonite flushing port, 1221-right bentonite flushing port, 1311-left bentonite nozzle, 1321-right bentonite nozzle, 141-grid flushing port, 151-backwash slurry suction port, 171-slurry discharge port. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] The core of the present invention is to provide a shield machine, a flushing device and a mud circulation system, which can solve the problems of low flushing efficiency, low slag carrying rate, and excessive accumulation of gravel at the bottom of the bin, which causes stagnation of the excavation and slag discharge system.

[0027] In order to enable those skilled in the art to better understand the solutions of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0028] It should be noted that the directional terms such as "upper end, lower end, left side, right side" described below are all defined based on the drawings in the specification.

[0029] Please refer to Figures 1 to 4 , Figure 1 A schematic diagram of the flushing of the left bentonite nozzle and the right bentonite nozzle in the mud circulation system provided by an embodiment of the present invention; Figure 2 A schematic diagram of the pipeline connection of the mud circulation system provided in an embodiment of the present invention; Figure 3 Schematic diagram of the distribution of the left bentonite outlet, the right bentonite outlet, the center flushing port, the left bentonite flushing port, and the right bentonite flushing port; Figure 4 This is a distribution diagram of the left bentonite nozzle, right bentonite nozzle, grid flushing port, slurry discharge port and backwash slurry suction port.

[0030] The slurry circulation system provided in an embodiment of the present invention includes a slurry feed pipeline 8 and a slurry feed pump 6, wherein the slurry feed pump 6 is connected to the slurry feed pipeline 8, and the slurry feed pipeline 8 is connected to a left bentonite nozzle pipeline 131 and a right bentonite nozzle pipeline 132. The left bentonite nozzle pipeline 131 and the right bentonite nozzle pipeline 132 are respectively connected to the left bentonite nozzle 1311 and the right bentonite nozzle 1321, and are connected to the air cushion chamber 3.

[0031] Furthermore, the angle between the normal of the left bentonite nozzle 1311 and the vertical direction is smaller than the angle between the line connecting the outlet center point of the left bentonite nozzle 1311 and the center point of the bottom of the shield and the vertical direction, and the angle between the normal of the right bentonite nozzle 1321 and the vertical direction is smaller than the angle between the line connecting the outlet center point of the right bentonite nozzle 1321 and the center point of the bottom of the shield and the vertical direction.

[0032] In this way, during the excavation of the shield machine, the left bentonite nozzle 1311 and the right bentonite nozzle 1321 both flush the soil at the bottom of the bin at an angle deviating from the center of the bottom of the shield body. The mud bounces off the bottom of the bin along the trajectory of the nozzle spray and enters the slurry discharge port 171. Under the lifting and suction action of the water flow, the soil at the bottom of the bin is quickly gathered and brought into the slurry discharge port 171, which can greatly improve the slag carrying efficiency of the flushing pipe.

[0033] Specifically, if Figure 1 As shown, the slurry discharge port 171 is located above the bottom of the tank. Point o represents the center of the nozzle outlet; point a represents the intersection of the discharge port 171 and the shield in the vertical direction, i.e., directly below the discharge port 171; point b represents the intersection of the scouring trajectory and the shield surface, i.e., the actual scouring location; point c represents the projection of the nozzle center point o onto the shield vertically downward, i.e., directly below the nozzle center. ob represents the nozzle normal, i.e., the actual scouring trajectory. The angle between oa and oc is θ, and the angle between the extended line of ob and the extended line of oc is β.

[0034] That is to say, during the operation of the shield machine, both the left bentonite nozzle 1311 and the right bentonite nozzle 1321 flush the soil at the bottom of the bin at an angle off-center. The mud sprayed from the left bentonite nozzle 1311 bounces off the bottom of the bin along the trajectory ob shown in the figure and enters the slurry discharge port 171. Under the lifting and suction action of the water flow, the soil at the bottom of the bin is quickly gathered and brought into the slurry discharge port 171. The mud sprayed from the right bentonite nozzle 1321 refers to the left bentonite nozzle 1311, which can greatly improve the slag carrying efficiency of the flushing pipe.

[0035] It should be noted that the above-mentioned "at an angle off-center" specifically means that the angle β between the extension line of ob and the extension line of oc is less than the angle θ between oa and oc, that is, β<θ. At the same time, in the description of the embodiments of the present invention, it should be understood that the terms "left", "right", "above", "off-center", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0036] Compared with the traditional mud circulation system with low slag carrying capacity and poor flushing effect, the mud circulation system provided by the embodiment of the present invention flushes the soil at the bottom of the bin at an angle deviated from the center of the bottom of the shield body through the left bentonite nozzle 1311 and the right bentonite nozzle 1321, so that the soil gathers toward the slurry discharge port 171 and quickly enters the slurry discharge port 171 through the suction effect. This can greatly improve the system's slag carrying capacity and flushing effect, thereby realizing efficient and rapid slag discharge of the shield machine during tunnel excavation, reducing the blockage of the slurry discharge port 171, and reducing the construction risk caused by the shield machine's shutdown, thereby improving production efficiency.

[0037] On the basis of the above, the slurry inlet pipeline 8 is further connected to the left bentonite pipeline 101 and the right bentonite pipeline 102 . The left bentonite pipeline 101 and the right bentonite pipeline 102 are respectively connected to the left bentonite outlet 1011 and the right bentonite outlet 1021 and connected to the excavation chamber 1 .

[0038] In this way, the prepared pressurized slurry enters the slurry inlet pipeline 8 through the slurry inlet pump 6, and then is divided into the left bentonite pipeline 101, the right bentonite pipeline 102, the left bentonite nozzle pipeline 131, and the right bentonite nozzle pipeline 132. Among them, the slurry pumped out from the left bentonite outlet 1011 and the right bentonite outlet 1021 enters the excavation chamber 1, forming a mud film on the excavation surface 9, thereby preventing the excavation surface 9 from collapsing.

[0039] Furthermore, the slurry inlet pipeline 8 is also connected to a left bentonite flushing pipeline 121 and a right bentonite flushing pipeline 122 . The left bentonite flushing pipeline 121 and the right bentonite flushing pipeline 122 are respectively connected to the left bentonite flushing port 1211 and the right bentonite flushing port 1221 and connected to the excavation chamber 1 .

[0040] In this way, the prepared pressurized slurry enters the slurry inlet pipeline 8 through the slurry inlet pump 6, and then is divided and enters the left bentonite pipeline 101, the right bentonite pipeline 102, the left bentonite flushing pipeline 121, the right bentonite flushing pipeline 122, the left bentonite nozzle pipeline 131, and the right bentonite nozzle pipeline 132. Among them, the slurry pumped out from the left bentonite flushing port 1211 and the right bentonite flushing port 1221 is used to flush the bottom area of ​​the cutterhead and carry the excavated soil from the excavation chamber 1 into the air cushion chamber 3.

[0041] Furthermore, the slurry inlet pipeline 8 is also connected to the cutterhead center flushing pipeline 11 and the cutterhead center flushing pump 5 . The cutterhead center flushing pipeline 11 is connected to the center flushing port 110 and is connected to the excavation chamber 1 .

[0042] In this way, the prepared pressurized slurry enters the slurry inlet pipeline 8 through the slurry inlet pump 6, and then is divided into the left bentonite pipeline 101, the right bentonite pipeline 102, the left bentonite flushing pipeline 121, the right bentonite flushing pipeline 122, the left bentonite nozzle pipeline 131, the right bentonite nozzle pipeline 132, and the cutterhead center flushing pipeline 11. The slurry is pressurized again by the cutterhead center flushing pump 5 and enters the cutterhead center flushing pipeline 11, where it forms a pressure jet at the center flushing port 110 to flush the mud mass in the center of the cutterhead. The mud mass flushed down by the center flushing port 110 and the left bentonite flushing ports 1211 and the right bentonite flushing ports 1221 enters the excavation chamber 1 of the slurry shield machine and is deposited at the bottom. The mud cut by the cutterhead is also deposited at the bottom of the excavation chamber 1 and is carried into the air cushion chamber 3 by the action of the mud flow.

[0043] In addition, the mud circulation system further includes a slurry discharge pipeline 17 and a slurry discharge pump 16 connected to the slurry discharge pipeline 17 . The slurry discharge pipeline 17 is connected to a slurry discharge port 171 and is connected to the air cushion chamber 3 .

[0044] In order to prevent the slurry discharge port 171 from being blocked, the slurry inlet pipeline 8 is also connected to the grille flushing pipeline 14, which is connected to the grille flushing port 141 and connected to the air cushion bin 3; the grille flushing port 141 is arranged obliquely above the slurry discharge port 171, and the grille flushing port 141 is provided with a bent pipe for flushing the slurry discharge port 171 to prevent the slurry discharge port 171 from being blocked.

[0045] In this way, if Figure 2As shown, during the tunneling process of the shield machine, the prepared pressure slurry enters the slurry feed pipeline 8 through the slurry feed pump 6, and then is divided and enters the left bentonite pipeline 101, the right bentonite pipeline 102, the left bentonite flushing pipeline 121, the right bentonite flushing pipeline 122, the left bentonite nozzle pipeline 131, the right bentonite nozzle pipeline 132, the cutterhead center flushing pipeline 11 and the grid flushing pipeline 14 respectively. Among them, the slurry pumped out by the left bentonite outlet 1011 and the right bentonite outlet 1021 enters the excavation chamber 1 to establish a mud film on the excavation surface 9; the slurry pumped out by the left bentonite flushing port 1211 and the right bentonite flushing port 1221 is used to flush the bottom area of ​​the cutter head and carry the excavation chamber 1 slag into the air cushion chamber 3; the mud sprayed by the left bentonite nozzle 1311 and the right bentonite nozzle 1321 is used to flush the mud at the bottom of the air cushion chamber 3; the mud pumped out by the grille flushing port 141 is used to flush the slurry outlet 171 to prevent the slurry outlet 171 from being blocked; the slurry is pressurized again by the cutter head center flushing pump 5 and enters the cutter head center flushing pipe, and in the middle The central flushing port 110 forms a pressure jet to flush the mud mass in the center of the cutter disc; the mud mass flushed down by the central flushing port 110 and the left bentonite flushing port 1211 and the right bentonite flushing port 1221 enters the excavation chamber 1 of the slurry shield machine and is deposited at the bottom. The mud cut off by the cutter disc is also deposited at the bottom of the excavation chamber 1 and is brought into the air cushion chamber 3 by the action of the mud flow; in the air cushion chamber 3, the left bentonite nozzle 1311 and the right bentonite nozzle 1321 are arranged off-center to flush the debris or stones deposited at the bottom of the chamber at a higher flow rate, so that the debris or stones are flushed and carried into the slurry discharge pipeline 17 at a faster speed.

[0046] In addition, in order to further prevent the slurry discharge port 171 from being blocked, the mud circulation system also includes a backwash slurry discharge pipeline 15 connected to the slurry discharge pipeline 17. The backwash slurry discharge pipeline 15 is connected to the backwash slurry suction port 151 and is connected to the air cushion chamber 3; and the height of the backwash slurry suction port 151 is greater than the height of the slurry discharge port 171.

[0047] At the same time, the system also includes a backwashing slurry inlet pipeline 7, and both ends of the backwashing slurry inlet pipeline 7 are connected to the slurry inlet pipeline 8 and the backwashing slurry discharge pipeline 15 respectively.

[0048] In this way, if the slurry discharge port 171 is blocked, a backwash cycle is adopted to directly pump fresh slurry into the slurry discharge port 171 through the slurry inlet pipeline 8, the backwash slurry inlet pipeline 7 and the slurry discharge pipeline 17, and the backwash slurry suction port 151 and the slurry discharge pipeline 17 are connected through the backwash slurry discharge pipeline 15 for slurry discharge, thereby achieving the purpose of unblocking the blockage of the slurry discharge port 171.

[0049] It should be noted that the excavation chamber 1 and the air cushion chamber 3 in the embodiment of the present invention are respectively located behind the excavation surface 9. Specifically, a submerged wall 2 is provided behind the excavation surface 9, and a partition wall 4 is provided behind the submerged wall 2. The excavation chamber 1 is located between the excavation surface 9 and the submerged wall 2, and the air cushion chamber 3 is located between the submerged wall 2 and the partition wall 4. The left bentonite outlet 1011, the right bentonite outlet 1021, the central flushing port 110, the left bentonite flushing port 1211, and the right bentonite flushing port 1221 mentioned above all extend out of the submerged wall 2 and are connected to the excavation chamber 1, as shown in FIG. Figure 3 left bentonite nozzle 1311, right bentonite nozzle 1321, the grid flushing port 141, the slurry discharge port 171 and the backwash slurry suction port 151 are extended out of the partition wall 4 and connected to the air cushion chamber 3, such as Figure 4 shown.

[0050] The present invention provides a flushing device, which includes the mud circulation system described in the above specific embodiment; other parts of the flushing device can refer to the existing technology and will not be elaborated in this article.

[0051] The present invention provides a shield machine, comprising the above-mentioned flushing device; the shield machine may be an indirectly controlled slurry shield machine, and other parts of the slurry shield machine may refer to the prior art and will not be elaborated in this article.

[0052] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0053] The shield machine, flushing device and mud circulation system provided by the present invention are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the scheme of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A mud circulation system, characterized in that: The invention comprises a slurry inlet pipeline (8) and a slurry inlet pump (6) connected to the slurry inlet pipeline (8), wherein the slurry inlet pipeline (8) is connected to a left bentonite nozzle pipeline (131) and a right bentonite nozzle pipeline (132), wherein the left bentonite nozzle pipeline (131) and the right bentonite nozzle pipeline (132) are respectively connected to the left bentonite nozzle (1311) and the right bentonite nozzle (1321), and are connected to the air cushion chamber (3); the angle between the normal line of the left bentonite nozzle (1311) and the vertical direction is smaller than the angle between the line connecting the center point of the outlet of the left bentonite nozzle (1311) and the center point of the bottom of the shield body and the vertical direction, and the angle between the normal line of the right bentonite nozzle (1321) and the vertical direction is smaller than the angle between the line connecting the center point of the outlet of the right bentonite nozzle (1321) and the center point of the bottom of the shield body and the vertical direction; It also includes a slurry discharge pipeline (17) and a slurry discharge pump (16) connected to the slurry discharge pipeline (17); the slurry discharge pipeline (17) is connected to the slurry discharge port (171) and is connected to the air cushion chamber (3); The slurry inlet pipeline (8) is further connected to a grid flushing pipeline (14), the grid flushing pipeline (14) being connected to a grid flushing port (141) and connected to the air cushion bin (3); the grid flushing port (141) is arranged obliquely above the slurry discharge port (171), and the grid flushing port (141) is provided with a curved pipe for flushing the slurry discharge port (171) to prevent the slurry discharge port (171) from being blocked.

2. The mud circulation system according to claim 1, characterized in that: The slurry inlet pipeline (8) is further connected to a left bentonite pipeline (101) and a right bentonite pipeline (102); the left bentonite pipeline (101) and the right bentonite pipeline (102) are respectively connected to a left bentonite outlet (1011) and a right bentonite outlet (1021), and are connected to the excavation chamber (1).

3. The mud circulation system according to claim 2, characterized in that: The slurry inlet pipeline (8) is further connected to a left bentonite flushing pipeline (121) and a right bentonite flushing pipeline (122); the left bentonite flushing pipeline (121) and the right bentonite flushing pipeline (122) are respectively connected to a left bentonite flushing port (1211) and a right bentonite flushing port (1221), and are connected to the excavation chamber (1).

4. The mud circulation system according to claim 2, characterized in that: The slurry inlet pipeline (8) is also connected to a cutterhead center flushing pipeline (11) and a cutterhead center flushing pump (5); the cutterhead center flushing pipeline (11) is connected to a center flushing port (110) and is connected to the excavation chamber (1).

5. The mud circulation system according to claim 1, characterized in that: It also includes a backwash slurry discharge pipeline (15) connected to the slurry discharge pipeline (17), the backwash slurry discharge pipeline (15) is connected to the backwash slurry suction port (151) and connected to the air cushion bin (3); the height of the backwash slurry suction port (151) is greater than the height of the slurry discharge port (171).

6. The mud circulation system according to claim 5, characterized in that: It also includes a backwashing pulp inlet pipeline (7), and both ends of the backwashing pulp inlet pipeline (7) are respectively connected to the pulp inlet pipeline (8) and the backwashing pulp discharge pipeline (15).

7. A flushing device, characterized in that: The invention comprises a mud circulation system according to any one of claims 1 to 6.

8. A shield machine, characterized in that: Comprising the flushing device as claimed in claim 7.

Images