Shield body mud injection system in earth pressure balance shield
By setting up an independently controlled branch pipe grouting system in the earth pressure balance shield tunnel, the problem of unadjustable earth pressure during earth pressure balance shield construction was solved, achieving stable tunneling of the shield machine and improving grouting quality, while reducing construction risks and difficulties.
Patent Information
- Application Number
- CN202520276109.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-20
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2035-02-20
AI Technical Summary
In earth pressure balance shield tunneling, existing technologies suffer from problems such as shield jamming, synchronous slurry loss, ground settlement, difficulty in controlling tunneling posture, and unadjustable sealing water pressure, which increase construction difficulty and safety risks.
A slurry injection system for earth pressure balance shield tunneling is designed. By setting up a storage tank, a conveying unit and a central shield component, slurry is injected into the gap between the shield and the excavation face through independently controlled branch pipes. Combined with pressure sensors and pneumatic valves, precise control of earth pressure and selective injection of slurry are achieved.
It effectively maintains constant earth pressure, reduces construction difficulty and risk, improves grouting efficiency and quality, ensures smooth tunneling of the tunnel boring machine, extends the service life of the cutterhead, avoids mud cake phenomenon, and reduces grout loss.
Smart Images
Figure CN223839124U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of mud injection systems, specifically to a mud injection system for the shield body in an earth pressure balance shield tunnel. Background Technology
[0002] During earth pressure balance shield tunneling, as the soil is excavated, the shield tail moves forward with the entire shield machine. A gap forms between the exposed outer surface of the tunnel segments and the excavation face. At this point, the shield machine uses a synchronous grouting process to fill the gap and ensure fullness, thereby ensuring the stability of the excavation face and controlling surface settlement. The synchronous grout is generally composed of cement, fly ash, bentonite, sand, water, and admixtures. Due to equipment and pipeline limitations, the synchronous grout remains in a flowing state, typically with an initial setting time of 6 hours and a final setting time of approximately 30 hours.
[0003] Due to the limitations of existing earth pressure balance shield tunneling design and synchronous grouting equipment, the following shortcomings exist in the construction process of earth pressure balance shield tunnels:
[0004] Firstly, to prevent the shield from jamming, existing tunnel boring machines generally use a design where the front of the shield is larger than the rear, with the diameter of the cutterhead excavation face being about 30mm larger than the diameter of the front shield. Under soft rock geological conditions, the pressure of the soil chamber and the synchronous grouting pressure at the tail of the middle shield cannot affect the middle of the shield. As the tunnel boring machine advances, the soil above the shield moves down and fills the gap between the excavation face and the shield, thus causing surface subsidence.
[0005] Secondly, in geological conditions where the excavation face has a certain degree of self-arching, to prevent mud cake formation on the cutterhead and in the soil chamber, tunnel boring machines (TBMs) generally employ pneumatic or semi-open excavation. Simultaneous grouting, being in a flowing state, inevitably flows along the shield body into the soil chamber, resulting in significant loss of the grout and incomplete filling of the gaps between the excavation face and the outer diameter of the tunnel segments. This loss is particularly pronounced in the downhill section of the tunnel (currently, the required simultaneous grouting volume is 1.2 to 1.8 times the theoretical volume). Currently, secondary grouting is mainly performed a few rings behind the shield tail, but even this is difficult to guarantee complete filling of the gaps.
[0006] Third, the synchronous grout flows around the shield body. If the downtime is long, the synchronous grout will cause the shield body to be covered by the synchronous grout, which will make it difficult to control the tunneling posture of the shield.
[0007] Fourth, the gap between the tunnel excavation face and the outer diameter of the tunnel segment is not fully filled. Water seeps into the soil and fills this gap, then flows into the soil chamber through the shield, causing problems such as blowouts during tunnel excavation.
[0008] Currently, most methods involve injecting cement and water glass grout at intervals around the outer side of the entire ring of segments after the shield tail to seal the soil, but the effect is not ideal and the sealing pressure cannot be adjusted to ensure constant soil pressure. Utility Model Content
[0009] The purpose of this invention is to provide a slurry injection system for earth pressure balance shield tunneling machines. This system uses a conveying unit to transport slurry from a storage tank to the middle shield component, and injects it into the gaps through different branch pipes of the middle shield component. Each branch pipe is designed to be independently controllable to open or close, thereby solving the problem in the prior art that the sealing water pressure cannot be adjusted to ensure constant earth pressure.
[0010] This utility model embodiment is achieved through the following technical solution: This utility model embodiment provides a mud injection system for the shield body in an earth pressure balance shield tunneling machine, including:
[0011] Storage tanks are used to store slurry.
[0012] The conveying unit, one end of which is connected to the storage tank;
[0013] The middle shield is connected to the other end of the conveying unit, which is configured to transport the slurry in the storage tank to the middle shield.
[0014] The shield component includes a main pipe and at least two branch pipes. Each branch pipe is connected to the discharge end of the main pipe, and its end is used to extend into the gap between the shield body and the excavation face for grouting.
[0015] Each branch pipe can be independently controlled to open or close.
[0016] Optionally, the central shield includes at least three branch pipes arranged in a fan shape, with the included angle between the axes of two adjacent branch pipes being equal, and the axes of each branch pipe intersecting at the same point.
[0017] Optionally, the shield component includes a first branch pipe, a second branch pipe, a third branch pipe, and a fourth branch pipe arranged in sequence. A first pneumatic valve is installed on the first branch pipe, a second pneumatic valve is installed on the second branch pipe, a third pneumatic valve is installed on the third branch pipe, and a fourth pneumatic valve is installed on the fourth branch pipe.
[0018] Optionally, the main pipeline is equipped with hydraulic valves and pressure sensors. The hydraulic valves are configured to regulate the hydraulic pressure of the slurry flowing through the main pipeline, and the pressure sensors are configured to monitor the earth pressure above each branch pipeline.
[0019] Optionally, the conveying unit includes a conveying pipe and a plunger pump. One end of the conveying pipe is connected to a storage tank, and the other end is connected to the plunger pump. The main pipeline is connected to the plunger pump, and the plunger pump is configured to convey the slurry in the storage tank to the shield.
[0020] Optionally, the conveying unit also includes a screw conveyor, the inlet end of which is connected to the storage tank, and the outlet end of which is connected to the inlet end of the conveying pipe.
[0021] The screw conveyor is connected to a motor, and the screw conveyor is set to be driven by the motor to transport the slurry to the conveying pipe.
[0022] Optionally, the conveying pipe is detachably connected to the screw conveyor and detachably connected to the plunger pump, and the main pipeline is detachably connected to the plunger pump.
[0023] Optionally, a stirring mechanism is provided inside the storage tank to stir the slurry inside the storage tank.
[0024] Optionally, the stirring mechanism includes a crossbar and several stirring rods. The crossbar is positioned across the top opening of the storage tank. One end of each stirring rod is connected to the crossbar, and its free end extends to the bottom of the storage tank. There is a gap between each stirring rod and the bottom of the storage tank. Each stirring rod can be rotated by a power component.
[0025] Optionally, the stirring mechanism includes a first stirring rod and a second stirring rod, which are respectively disposed on both sides of the crossbar, and both the first stirring rod and the second stirring rod can be driven independently.
[0026] Compared with the prior art, the embodiments of this utility model have the following advantages and beneficial effects:
[0027] 1. The slurry injection system for the shield body in a pressure-balanced shield tunneling machine provided in this embodiment of the invention includes a storage tank for storing slurry and a conveying unit for conveying the slurry from the storage tank to the middle shield member. Grouting is achieved by inserting the discharge end of the middle shield member into the gap between the shield body and the excavation face. In this embodiment, the middle shield member includes a main pipe and at least two branch pipes. The main pipe conveys the slurry to the branch pipes, which then inject the slurry into the gap. Since at least two branch pipes are provided, each branch pipe can be independently controlled to open or close. During operation, selective grouting can be performed on the gap area where a single branch pipe is located to adjust the soil pressure above it, maintaining it within a certain safe range. This avoids the impact on the safety of ground buildings and infrastructure due to a drop in soil pressure, while ensuring stable tunneling of the shield machine, reducing construction difficulty and risk, and preventing the occurrence of mud cake disintegration during cutterhead cutting, thus improving cutting efficiency and extending the service life of the cutterhead.
[0028] 2. In this embodiment of the invention, a pressure sensor is installed on the main pipeline. This pressure sensor can monitor the earth pressure above different branch pipelines. When the earth pressure above the first branch pipeline is detected to be too high, the first pneumatic valve is closed, the first branch pipeline is blocked, and the grout cannot flow into the gap corresponding to the first branch pipeline. The earth pressure above the first branch pipeline no longer increases. As the tunnel boring machine advances, the gap widens. When the pressure sensor detects that the earth pressure above the first branch pipeline has dropped to a certain value, the first pneumatic valve is opened, the first branch pipeline is unblocked, and the grout is injected into the corresponding gap through the first branch pipeline, causing the earth pressure to rise. This cycle continues to maintain a constant earth pressure above the first branch pipeline. Similarly, the earth pressure above the second, third, and fourth branch pipelines can be controlled to be constant, keeping the earth pressure outside the tunnel boring machine within a certain safe range.
[0029] In general, the embodiments of this utility model provide a grouting system for an earth pressure balance shield tunnel. This system uses a conveying unit to transport grout from a storage tank to the middle shield member, and injects it into the gaps through different branch pipes of the middle shield member. Each branch pipe is designed to be independently controllable to open or close, so as to ensure constant earth pressure and improve grouting efficiency and quality. Attached Figure Description
[0030] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0031] Figure 1 A schematic diagram of the mud injection system for the shield body in an earth pressure balance shield tunneling machine provided in this embodiment of the utility model;
[0032] Figure 2 A schematic diagram of the stirring mechanism provided in an embodiment of this utility model;
[0033] Figure 3 This is a schematic diagram of the shield structure provided in an embodiment of the present utility model.
[0034] The attached diagram shows the markings and corresponding component names:
[0035] 1-Storage tank;
[0036] 2-Conveying section, 21-Conveying pipe, 22-Plunger pump, 23-Screw conveyor, 24-Motor;
[0037] 3-Middle shield component, 31-Main pipeline, 311-Hydraulic valve, 312-Pressure sensor, 32-First branch pipeline, 321-First pneumatic valve, 33-Second branch pipeline, 331-Second pneumatic valve, 34-Third branch pipeline, 341-Third pneumatic valve, 35-Fourth branch pipeline, 351-Fourth pneumatic valve;
[0038] 4-Stirring mechanism, 41-Horizontal bar, 42-First stirring rod, 43-Second stirring rod. Detailed Implementation
[0039] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.
[0040] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0041] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0042] In the description of this utility model, it should be noted that the terms "first", "second", "third", etc. are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance.
[0043] Example
[0044] Please see Figures 1 to 3This utility model embodiment provides a slurry injection system for an earth pressure balance shield tunneling machine, comprising: a storage tank 1 for storing raw materials, and a stirring mechanism 4 for stirring the slurry; a middle shield component 3, which includes a main pipe 31 and multiple branch pipes, all of which are fixedly connected to the main pipe. The connection method can be welding, bonding, spiral connection, etc., which are not limited here, as long as sufficient connection stability and sealing effect can be achieved. The end of each branch pipe extends into the gap between the shield body and the excavation face to grout the gap. Each branch pipe is independent and can be controlled individually, and grouting can be performed separately for gaps in different parts; and a conveying unit 2, one end of which is fixedly connected to the storage tank 1 and the other end of which is fixedly connected to the middle shield component 3, to convey the slurry in the storage tank 1 to the middle shield component 3 for grouting the gap.
[0045] For example, such as Figure 2 As shown, the stirring mechanism 4 includes a crossbar 41, a first stirring rod 42, and a second stirring rod 43. The crossbar 41 is horizontally fixed to the top of the storage tank 1, and can be connected by snap-fit, adhesive, welding, etc., without limitation, as long as sufficient connection and support stability can be achieved. The first stirring rod 42 and the second stirring rod 43 are both fixed to the lower surface of the crossbar 41 and extend into the storage tank 1 to stir the slurry in the storage tank 1. It should be noted that the number and structure of the crossbars 41 are not limited in this embodiment of the invention, nor is the number of stirring rods on a single crossbar 41 limited. For example, in other embodiments, two crossbars 41 can be arranged in parallel, and the first stirring rod 42 and the second stirring rod 43 can be respectively arranged on the two crossbars 41. Of course, in another embodiment, only one crossbar 41 can be provided, and one, three, or four stirring rods can be provided on the crossbar 41, depending on the capacity of the storage tank 1.
[0046] Returning to the embodiment of this utility model, preferably, the free end of a single stirring rod can extend to the bottom of the storage tank 1, while there is a gap between the single stirring rod and the bottom of the storage tank 1. This maximizes the vertical stirring range and avoids friction and wear between the stirring rod and the bottom of the storage tank 1. Alternatively, the first stirring rod 42 and the second stirring rod 43 can be set at different heights. Preferably, the first stirring rod 42 and the second stirring rod 43 can be respectively positioned on both sides of the crossbar 41, further increasing the stirring range. It should be noted that the stirring power for the first stirring rod 42 and the second stirring rod 43 can be existing devices such as electrical equipment or cylinders, and is not limited here. The first stirring rod 42 and the second stirring rod 43 can be configured as independently controlled stirring structures, allowing the operator to select and activate the first stirring rod 42 and the second stirring rod 43 according to the stirring conditions.
[0047] For example, such as Figure 1 As shown, the conveying unit 2 includes a conveyor unit, a conveying pipe 21, and a plunger pump 22. The conveyor unit includes a screw conveyor 23 and a power source. In this embodiment of the invention, a motor 24 is preferably used as the power source, which simplifies operation. The screw conveyor 23 is fixedly installed on the bottom of the outer side of the storage tank 1 and communicates with the inside of the storage tank 1. The slurry in the storage tank 1 can flow into the screw conveyor 23. One end of the conveying pipe 21 is fixedly connected to the tail of the screw conveyor 23, and the other end is fixedly connected to the end of the plunger pump 22. The power source is fixedly installed at the end of the screw conveyor 23 to drive the screw conveyor 23 to rotate and transport the slurry in the storage tank 1 to the plunger pump 22 through the conveying pipe 21.
[0048] like Figure 3 As shown, a pressure sensor 312 and a hydraulic valve 311 are installed on the main pipeline 31. The inlet end of the main pipeline 31 is connected to the outlet end of the plunger pump 22 to receive the slurry flowing out of the plunger pump 22. The hydraulic valve 311 is fixedly installed on the main pipeline 31. When the hydraulic valve 311 is open, the slurry can continue to flow through the main pipeline 31. When the hydraulic valve 311 is closed, the slurry cannot continue to flow through the main pipeline 31. The pressure sensor 312 is fixedly installed on the main pipeline 31 to monitor the earth pressure above the shield 3.
[0049] The branch pipe group is fixedly installed at the end of the main pipe 31. The branch pipe group includes a first branch pipe 32, a second branch pipe 33, a third branch pipe 34 and a fourth branch pipe 35. A first pneumatic valve 321 is installed on the first branch pipe 32. The first branch pipe 32 is fixedly connected to the end of the main pipe 31 and receives the slurry flowing out of the main pipe 31. The first pneumatic valve 321 is fixedly installed on the first branch pipe 32. When the first pneumatic valve 321 is open, the slurry can continue to flow through the first branch pipe 32 and be injected into the gap. When the first pneumatic valve 321 is closed, the slurry cannot continue to flow through the first branch pipe 32.
[0050] A second pneumatic valve 331 is installed on the second branch pipe 33. The second branch pipe 33 is fixedly connected to the end of the main pipe 31 and receives the slurry flowing out of the main pipe 31. The second pneumatic valve 331 is fixedly installed on the second branch pipe 33. When the second pneumatic valve 331 is opened, the slurry can continue to flow through the second branch pipe 33 and be injected into the gap. When the second pneumatic valve 331 is closed, the slurry cannot continue to flow through the second branch pipe 33.
[0051] A third pneumatic valve 341 is installed on the third branch pipe 34. The third branch pipe 34 is fixedly connected to the end of the main pipe 31 and receives the slurry flowing out of the main pipe 31. The third pneumatic valve 341 is fixedly installed on the third branch pipe 34. When the third pneumatic valve 341 is opened, the slurry can continue to flow through the third branch pipe 34 and be injected into the gap. When the third pneumatic valve 341 is closed, the slurry cannot continue to flow through the third branch pipe 34.
[0052] A fourth pneumatic valve 351 is installed on the fourth branch pipe 35. The fourth branch pipe 35 is fixedly connected to the end of the main pipe 31 and receives the slurry flowing out of the main pipe 31. The fourth pneumatic valve 351 is fixedly installed on the fourth branch pipe 35. When the fourth pneumatic valve 351 is open, the slurry can continue to flow through the fourth branch pipe 35 and be injected into the gap. When the fourth pneumatic valve 351 is closed, the slurry cannot continue to flow through the fourth branch pipe 35.
[0053] In a preferred embodiment of this utility model, the first branch pipe 32, the second branch pipe 33, the third branch pipe 34, and the fourth branch pipe 35 are arranged in a fan shape, and the included angle between the axes of two adjacent branch pipes is equal. The axes of each branch pipe intersect at the same point. This structure can improve the utilization rate of each branch pipe and expand the area in the gap that can be accurately grouted. The equal-angled gap setting can improve the accuracy of adjustment during the grouting process. The specific included angle range is not limited here and can be set according to actual needs.
[0054] It should be noted that in other embodiments, the number of branch pipes may be only two, three, or even five or six, and is not limited to the four branch pipes in this embodiment. The specific number can be set according to actual needs. The length of each branch pipe can be the same or different, and even the included angle between the axes of two adjacent branch pipes can be different. The axes of each branch pipe are not limited to intersecting at one point. For example, the axes of every two branch pipes can intersect at one point, as long as the purpose of expanding the grouting area can be achieved.
[0055] It should also be noted that the connection methods between the conveying pipe 21 and the screw conveyor 23, the conveying pipe 21 and the plunger pump 22, and the main pipe 31 and the plunger pump 22 are not limited here. They can be welded, bonded, snapped, spirally connected, etc., as long as sufficient connection stability and sealing are achieved. As a preferred embodiment of this utility model, the conveying pipe 21 and the screw conveyor 23 can be set to a detachable connection, the conveying pipe 21 and the plunger pump 22 can be set to a detachable connection, and the main pipe 31 and the plunger pump 22 can be set to a detachable connection. This can improve the flexibility of the device and facilitate the maintenance or replacement of individual components.
[0056] In use, the slurry is first loaded into the storage tank 1 according to a certain ratio. The drive power of the first stirring rod 42 and the second stirring rod 43 is then turned on. The first stirring rod 42 and the second stirring rod 43 begin to stir and mix the slurry in the storage tank 1. After the slurry is mixed into a uniform mud, the motor 24 next to the screw conveyor 23 is started. The motor 24 drives the screw conveyor 23 to rotate, conveying the mud in the storage tank 1 to the conveying pipe 21. The mud enters the plunger pump 22 through the conveying pipe 21 and then enters the main pipeline 31 along the plunger pump 22. The hydraulic valve 3 is then opened. 11. The slurry flows through the main pipe 31 into the first branch pipe 32, the second branch pipe 33, the third branch pipe 34, and the fourth branch pipe 35 respectively. The first pneumatic valve 321, the second pneumatic valve 331, the third pneumatic valve 341, and the fourth pneumatic valve 351 are opened. The slurry then flows through the first branch pipe 32, the second branch pipe 33, the third branch pipe 34, and the fourth branch pipe 35 into the gap between the shield and the excavation face, filling the gap with slurry to maintain soil pressure and prevent the safety of ground buildings and infrastructure from being affected by a drop in soil pressure. This also ensures the safety of the tunnel boring machine. The machine advances smoothly, reducing construction difficulty and risk, and also avoiding the phenomenon of mud cake breaking during the cutting process, thus improving cutting efficiency and extending the service life of the cutterhead. When the pressure sensor 312 detects excessive soil pressure above the middle shield 3, it closes the corresponding pneumatic valve. For example, when the soil pressure above the first branch pipe 32 is too high, the first pneumatic valve 321 is closed, blocking the first branch pipe 32. Mud cannot flow through the first branch pipe 32 into the corresponding gap, and the soil pressure above the first branch pipe 32 no longer increases. As the tunnel boring machine advances, the gaps widen. When the pressure sensor 312 detects that the soil pressure above the first branch pipe 32 has dropped to a certain value, the first pneumatic valve 321 is opened, allowing the first branch pipe 32 to flow freely. Mud slurry is then injected into the corresponding gap through the first branch pipe 32, increasing the soil pressure. This cycle continues, maintaining a constant soil pressure above the first branch pipe 32. Similarly, the soil pressure above the second branch pipe 33, the third branch pipe 34, and the fourth branch pipe 35 can be controlled to remain constant, keeping the soil pressure outside the tunnel boring machine within a certain safe range.
[0057] 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. It should be noted that the structures or components illustrated in the accompanying drawings are not necessarily drawn to scale, and descriptions of well-known components, processing techniques, and processes are omitted to avoid unnecessarily limiting the utility model.
Claims
1. A mud injection system for the shield body in an earth pressure balance shield tunneling machine, characterized in that, include: Storage tank (1), used for storing slurry; The conveying unit (2) has one end connected to the storage tank (1); The middle shield (3) is connected to the other end of the conveying part (2), and the conveying part (2) is configured to convey the slurry in the storage tank (1) to the middle shield (3); The shield component (3) includes a main pipe (31) and at least two branch pipes. Each branch pipe is connected to the discharge end of the main pipe (31), and its end is used to extend into the gap between the shield body and the excavation face for grouting. Each of the branch pipes can be independently controlled to open or close.
2. The earth pressure balance shield tunneling machine mud injection system according to claim 1, characterized in that, The shield component (3) includes at least three branch pipes arranged in a fan shape, with the included angle between the axes of two adjacent branch pipes being equal, and the axes of each branch pipe intersecting at the same point.
3. A mud injection system for the shield body in an earth pressure balance shield tunneling machine according to claim 1 or 2, characterized in that, The shield component (3) includes a first branch pipe (32), a second branch pipe (33), a third branch pipe (34), and a fourth branch pipe (35) arranged in sequence. A first pneumatic valve (321) is provided on the first branch pipe (32), a second pneumatic valve (331) is provided on the second branch pipe (33), a third pneumatic valve (341) is provided on the third branch pipe (34), and a fourth pneumatic valve (351) is provided on the fourth branch pipe (35).
4. The earth pressure balance shield tunneling machine mud injection system according to claim 1, characterized in that, The main pipeline (31) is equipped with a hydraulic valve (311) and a pressure sensor (312). The hydraulic valve (311) is configured to regulate the hydraulic pressure of the slurry flowing through the main pipeline (31), and the pressure sensor (312) is configured to monitor the earth pressure above each branch pipeline.
5. The earth pressure balance shield tunneling machine mud injection system according to claim 1, characterized in that, The conveying unit (2) includes a conveying pipe (21) and a plunger pump (22). One end of the conveying pipe (21) is connected to the storage tank (1), and the other end is connected to the plunger pump (22). The main pipeline (31) is connected to the plunger pump (22). The plunger pump (22) is configured to convey the slurry in the storage tank (1) to the shield (3).
6. The earth pressure balance shield tunneling machine mud injection system according to claim 5, characterized in that, The conveying unit (2) also includes a screw conveyor (23), the inlet end of which is connected to the storage tank (1), and the outlet end of which is connected to the inlet end of the conveying pipe (21); The screw conveyor (23) is connected to a motor (24), and the screw conveyor (23) is configured to be driven by the motor (24) to transport the slurry to the conveying pipe (21) by a screw.
7. The earth pressure balance shield tunneling machine mud injection system according to claim 6, characterized in that, The conveying pipe (21) is detachably connected to the screw conveyor (23) and is detachably connected to the plunger pump (22). The main pipe (31) is detachably connected to the plunger pump (22).
8. The earth pressure balance shield tunneling machine mud injection system according to claim 1, characterized in that, The storage tank (1) is equipped with a stirring mechanism (4), which is used to stir the slurry in the storage tank (1).
9. The earth pressure balance shield tunneling machine mud injection system according to claim 8, characterized in that, The stirring mechanism (4) includes a crossbar (41) and a plurality of stirring rods. The crossbar (41) is arranged across the top opening of the storage tank (1). One end of each stirring rod is connected to the crossbar (41), and its free end extends to the bottom of the storage tank (1). There is a gap between each stirring rod and the bottom of the storage tank (1). Each stirring rod can be driven by a power component to rotate.
10. The earth pressure balance shield tunneling machine mud injection system according to claim 9, characterized in that, The stirring mechanism (4) includes a first stirring rod (42) and a second stirring rod (43), which are respectively disposed on both sides of the crossbar (41). Both the first stirring rod (42) and the second stirring rod (43) can be driven independently.