A trenching and milling device and method for diaphragm walls in confined aquifers.

Abstract

This invention discloses a trenching device and method for diaphragm walls in confined aquifers, primarily relating to the technical field of twin-wheel trenching machines. It includes a support frame, with two milling wheels mounted on the lower surface for trenching, and a suction nozzle for absorbing water and sludge mounted on the lower surface between the two milling wheels. The upper end of the suction nozzle is connected to a discharge pipe, and a mud pump for providing suction power is installed on the outer wall of the discharge pipe. An anti-surge device is also included, serving as a seal to prevent surges. The beneficial effects of this invention are: by incorporating the anti-surge device, when the flow sensor detects an abnormal flow in the discharge pipe, the solenoid valve automatically opens, rapidly injecting water into the water bladder using the sludge in the discharge pipe, thereby sealing the gap between the support frame and the trench wall in a timely manner. This effectively suppresses the surge of confined water, preventing it from carrying away the soil from the trench wall and causing collapse, thus ensuring the safety of trenching construction.

Description

Technical Field

[0001] This invention relates to the field of twin-wheel trenching machine technology, and in particular to a trenching milling device and trenching method for diaphragm walls in pressurized aquifers. Background Technology

[0002] The twin-wheel trenching machine is a heavy machine used for the construction of underground continuous walls. It cuts and breaks the strata by using two counter-rotating milling wheels. It is mainly used for the construction of underground anti-seepage walls or retaining walls in projects such as subway stations, deep foundation pits, and reservoir dams. It can efficiently form trenches in hard rock or complex geological conditions.

[0003] Existing technologies, such as the invention disclosed in patent CN115787763B, include a milling device and a twin-wheel milling machine. This patent includes a tool holder; two milling wheels mounted on the tool holder; and a first vibration damping device, comprising a base connected to the mounting surface of the tool holder. The base has damping holes that penetrate the base along its thickness direction. The base has a first state, in which it is located in a first position, and the surface of the base in its thickness direction intersects the mounting surface of the tool holder, allowing fluid in the groove milled by the milling wheels to flow through the damping holes. The mounting surface of the tool holder is the surface of the tool holder used for connection with the base. This reduces the vibration of the tool holder and improves the performance of the twin-wheel milling machine.

[0004] The existing technology of trenching and milling devices for diaphragm walls in confined aquifers has the following technical defects: When performing trenching construction, the existing twin-wheel trenching machine has obvious safety defects because it cannot effectively deal with the problem of confined water surging. When the milling device penetrates into the confined aquifer, the high-pressure confined water will surge rapidly along the gap between the support frame and the trench wall, which can easily carry away the soil around the trench wall, causing the trench wall to become unstable and collapse, seriously threatening construction safety. Traditional twin-wheel trenching machines lack real-time monitoring and automatic response mechanisms for abnormal flow in the discharge pipe, and cannot take timely blocking measures in the early stage of confined water surging. They often have to rely on external intervention or post-event handling, which is a delayed response and makes it difficult to ensure the continuity and stability of the trenching process.

[0005] Therefore, there is an urgent need for a trenching device that can automatically detect and suppress the upwelling of pressurized water to improve construction safety and reliability. Summary of the Invention

[0006] The purpose of this invention is to solve the problem that existing twin-wheel trenching machines cannot monitor and automatically seal the water inrush gaps between the support frame and the trench wall in real time when trenching in confined aquifers, which leads to the collapse of the trench wall due to the upward flow of confined water and poor construction safety and stability. Therefore, this invention proposes a trenching milling device and trenching method for diaphragm walls in confined aquifers.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a milling device for trenching diaphragm walls in confined aquifers, comprising:

[0008] A support frame, on the lower surface of which are mounted two milling wheels for digging grooves, and on the lower surface of which are mounted a suction nozzle for sucking water and mud, the suction nozzle being located between the two milling wheels, the upper end of the suction nozzle being connected to a discharge pipe, and a mud pump for providing suction power being mounted on the outer wall of the discharge pipe;

[0009] An anti-surge device, which serves as an anti-surge seal, includes a water bladder for sealing the gap between the support frame and the tank wall, a connecting pipe, a solenoid valve, and a connecting pipe for injecting water into the water bladder. The water bladder is configured as a rectangular ring structure, with its inner ring fixedly connected to the side wall of the support frame. One end of the connecting pipe is connected to the upper surface of the water bladder, and the other end is connected to the outlet end of the solenoid valve. Both ends of the connecting pipe are connected to the inlet end of the solenoid valve and the discharge pipe, respectively. The connecting pipe is located above the mud pump, and a flow sensor for monitoring the flow rate inside the discharge pipe is installed on the outer wall of the discharge pipe.

[0010] The effect achieved by the above-mentioned components is as follows: by setting up an anti-surge device, the solenoid valve can be automatically opened when the flow sensor detects an abnormal flow in the discharge pipe. The mud in the discharge pipe is used to quickly inject water into the water bag to expand, thereby sealing the gap between the support frame and the trench wall in time, effectively suppressing the upward surge of pressurized water, and preventing the pressurized water from carrying away the mud in the trench wall and causing collapse, thus ensuring the safety of trenching construction.

[0011] Preferably, both sides of the outer ring of the water bladder are recessed inward to form a receiving cavity. The inner wall of the receiving cavity is fixedly connected to a fixing plate for driving the water bladder to expand and contract and supporting the water bladder. A connecting plate is fixedly connected to the upper surface of the fixing plate. Two partitions are fixedly connected to both sides of the outer wall of the support frame. The four partitions are divided into two groups of two. The sides of the two groups of partitions are slidably provided with arched plates for driving the connecting plates to move laterally. The lower surfaces of the two arched plates are respectively connected to the upper surfaces of the two connecting plates. Mounting holes are opened on both sides of the outer wall of the support frame. A first hydraulic cylinder is rotatably connected to one side of the inner wall of the mounting hole. The output end of the first hydraulic cylinder is rotatably connected to a rotating seat. The rotating seat is fixedly connected to the upper surface of the arched plate.

[0012] The effect achieved by the above components is as follows: the first hydraulic cylinder drives the rotating seat, thereby causing the arched plate to move laterally, and the arched plate drives the fixed plate to move, which can adjust the extension range of the water bag, adapt to different tank walls, and provide effective support for the water bag to ensure the sealing effect.

[0013] Preferably, storage holes for accommodating the arched plate are provided on both sides of the outer wall of the support frame, and the storage holes are positioned and sized to match the arched plate.

[0014] The effects achieved by the above components are: the storage hole can accommodate the arched plate, reduce the overall width of the device, prevent the components from rubbing against the tank wall, and improve the passability of the equipment during lifting and lowering.

[0015] Preferably, the same airbag is fixedly connected between one side of the two fixed plates and the outer ring of the water bag, and a sealing ring is fixedly connected to the outer wall of the airbag to improve the sealing between the tank wall and the airbag.

[0016] The effect achieved by the above components is that the water bladder and the sealing ring form a secondary sealing structure, which further seals the water leakage gaps, while buffering the contact pressure and protecting the water bladder from wear.

[0017] Preferably, the anti-surge device further includes a drain pipe, which is fixedly installed inside the water bladder. The two ends of the drain pipe penetrate the upper and lower surfaces of the water bladder and extend outward, respectively. The drain pipe is used to drain the surging water between the water bladder and the bottom wall of the tank. The upper end of the drain pipe is fixedly connected to a connecting hose, and the lower end of the drain pipe is fixedly connected to a funnel-shaped inlet pipe.

[0018] The effect achieved by the above components is as follows: when using the suction pipe, the connecting hose needs to be connected to the pump body on the ground so that the gushing water can be discharged in time. When used in conjunction with the original suction nozzle of the device, it can effectively reduce the water pressure at the bottom of the tank and prevent the water bladder from being pushed up by the high-pressure water flow.

[0019] Preferably, the inner wall of the extraction pipe is fixedly connected with a plurality of labyrinth plates, which are distributed at intervals along the axial direction of the extraction pipe. Adjacent labyrinth plates are arranged alternately to form a labyrinth flow channel to reduce the flow rate of the gushing water.

[0020] The effect achieved by the above components is that the staggered labyrinth plates form a tortuous flow channel, which slows down the water flow velocity and weakens the impact force of the water flow.

[0021] Preferably, a plurality of water level sensors for monitoring the water level are installed on the lower surface of the water bladder.

[0022] The above components achieve the following effects: the water level sensor monitors the water level changes in the tank in real time, promptly grasps the water inrush situation, and when used in conjunction with the flow sensor, it facilitates the staff to adjust the equipment parameters and deal with sudden water inrush problems.

[0023] Preferably, the lower surface of the water bladder is fixedly connected to a discharge pipe with a valve, which is used to discharge the medium inside the water bladder after the operation is completed.

[0024] Preferably, the inner wall of the connecting pipe is provided with a dirt filtering device, which includes a fixing ring fixed to the inner wall of the connecting pipe. A filter screen for filtering dirt is fixedly connected to the inner wall of the fixing ring. An annular hole is opened on the side of the fixing ring near the discharge pipe. A sliding ring is slidably connected to the inner wall of the annular hole. A support plate is fixedly connected to the side of the sliding ring away from the fixing ring. A scraper is fixedly connected to the side of the support plate near the filter screen. A connecting rod is fixedly connected to one side of the support plate. Several vortex blades for driving the connecting rod to rotate are fixedly connected to the arc surface of the connecting rod. A magnetic ring is attached to the inner wall of the connecting pipe. Several connecting rods are fixedly connected to one side of the magnetic ring. One end of several connecting rods is fixedly connected to the same scraper ring for scraping mud and dirt off the inner wall of the connecting pipe. An iron ring is slidably connected to the outer wall of the connecting pipe. The iron ring and the magnetic ring are positioned opposite each other and are attracted to each other.

[0025] The effects achieved by the above components are as follows: by setting up a dirt filtration device, large particles of dirt in the mud can be intercepted by the filter screen. At the same time, the mud flow drives the vortex blades to rotate the scraper, which automatically cleans the surface of the filter screen. Meanwhile, the external iron ring magnetically drives the scraper ring to move, which can simultaneously remove the dirt adhering to the inner wall of the connecting pipe, thereby effectively preventing the pipe and solenoid valve from becoming blocked.

[0026] Preferably, a welding plate is fixedly connected to the outer wall of the discharge pipe, a second hydraulic cylinder is fixedly connected to one side of the welding plate, an ear plate is fixedly connected to the output end of the second hydraulic cylinder, and one side of the ear plate is fixedly connected to the outer wall of the iron ring.

[0027] The effect achieved by the above components is as follows: the second hydraulic cylinder drives the iron ring to move back and forth, and the magnetic attraction drives the scraper ring to clean the stubborn mud and dirt on the pipe wall, which can achieve pipe cleaning without disassembly, further reducing the risk of connection pipe blockage and reducing the difficulty of equipment maintenance.

[0028] A trenching method for forming a diaphragm wall in a confined aquifer includes the following steps:

[0029] S1. Equipment assembly and commissioning: The milling device is hoisted and lowered to the construction site. The support frame and milling wheel are aligned and calibrated. The connecting hose at the top of the extraction pipe is connected to the ground pump body. The working status of the flow sensor, water level sensor, hydraulic cylinders and solenoid valves is checked to ensure that all mechanisms of the equipment start and stop normally.

[0030] S2. Trench Milling and Shaping: Start the equipment to drive the two milling wheels at the bottom of the support frame to rotate, and mill and excavate the pressurized water stratum layer by layer. Simultaneously start the mud pump to form negative pressure, and continuously suck up the mud and water generated in the trench through the suction nozzle between the two sets of milling wheels, and discharge it to the outside through the discharge pipe to continuously complete the milling and shaping operation of the diaphragm wall trench.

[0031] S3. Real-time water inrush monitoring: Throughout the construction process, the flow rate of the slurry in the pipeline is monitored by the flow sensor on the outer wall of the discharge pipe. At the same time, the water level sensor at the bottom of the water tank is used to collect the water level data at the bottom of the tank in real time. The dual monitoring captures the working conditions such as pressurized water inrush and abnormal water volume in real time, providing accurate data support for anti-inrush control.

[0032] S4. Adaptive anti-surge seal: When an abnormal water inrush is detected, the solenoid valve is automatically opened, allowing the mud in the discharge pipe to be injected into the water bladder through the connecting pipe and the connecting pipe. This causes the water bladder to expand rapidly and seal the gap between the support frame and the tank wall. According to the actual distance from the tank wall, the first hydraulic cylinder drives the arch plate and the fixed plate to move, adjusting the expansion and contraction of the water bladder to match the tank size. Together with the air bladder and the sealing ring, a double-layer sealing structure is formed to completely block the leakage channel of pressurized water. At the same time, the arch plate is stored in the storage hole to prevent the equipment from scraping against the tank wall when it is raised or lowered.

[0033] S5. Pressure control and diversion at the bottom of the tank: During construction, the water bladder is used to collect the pressurized water from the bottom of the tank through the funnel-shaped inlet pipe at the bottom. After the water is slowed down and stabilized and impurities are intercepted in the labyrinth flow channel formed by the labyrinth plate, the water is discharged by the connecting hose in conjunction with the ground pump body. This effectively reduces the water pressure at the bottom of the tank, prevents high-pressure water from lifting the water bladder and damaging the sealing structure, and ensures stable pressure inside the tank.

[0034] S6. Pipeline Self-Cleaning and Unobstructed Operation: Throughout the construction process, the mud flows through the connecting pipe, automatically filtering large particles of impurities through a filter screen. The impact force of the mud fluid drives the vortex blades to rotate, which in turn drives the scraper to dynamically clean the filter screen. At the same time, the second hydraulic cylinder is intermittently activated, driving the iron ring to slide back and forth. Through magnetic attraction, the magnetic ring, connecting rod, and scraper ring repeatedly scrape away stubborn mud from the inner wall of the connecting pipe, continuously keeping the pipeline and solenoid valve unobstructed, ensuring the stable operation of the anti-surge water injection system, and completing the entire safe trenching construction process.

[0035] In summary, the beneficial effects of the present invention are as follows:

[0036] In this invention, by setting up an anti-surge device, the solenoid valve can be automatically opened when the flow sensor detects an abnormal flow in the discharge pipe. The mud in the discharge pipe is used to quickly inject water into the water bag to expand, thereby sealing the gap between the support frame and the trench wall in time, effectively suppressing the upward surge of pressurized water, and preventing the pressurized water from carrying away the mud in the trench wall and causing collapse, thus ensuring the safety of trenching construction.

[0037] In this invention, by setting up a dirt filtration device, large particles of dirt in the slurry can be intercepted by the filter screen. At the same time, the slurry flow drives the vortex blades to rotate the scraper, which automatically cleans the surface of the filter screen. Meanwhile, the external iron ring magnetically attracts and moves the scraper ring, which can simultaneously remove the dirt adhering to the inner wall of the connecting pipe, thereby effectively preventing the pipe and solenoid valve from becoming blocked. Attached Figure Description

[0038] Appendix Figure 1This is a three-dimensional structural schematic diagram of the present invention;

[0039] Appendix Figure 2 This is the invention Figure 1 The diagram shows a partial structure.

[0040] Appendix Figure 3 This is a schematic diagram of the anti-surge device of the present invention;

[0041] Appendix Figure 4 This is a partial structural schematic diagram of the anti-surge device of the present invention;

[0042] Appendix Figure 5 This is a schematic diagram of the internal structure of the water bladder in the anti-surge device of the present invention;

[0043] Appendix Figure 6 This is a schematic diagram of the internal structure of the extraction pipe in the anti-surge device of the present invention;

[0044] Appendix Figure 7 This is the invention Figure 3 The diagram shows a partial structure.

[0045] Appendix Figure 8 This is a schematic diagram of the connecting tube of the present invention;

[0046] Appendix Figure 9 This is a schematic diagram of the dirt filtration device of the present invention;

[0047] Appendix Figure 10 This is a partial structural disassembly diagram of the dirt filtration device of the present invention.

[0048] The following are the reference numerals in the attached diagram: 1. Support frame; 2. Milling wheel; 3. Anti-surge device; 301. Water bladder; 302. Connecting pipe; 303. Solenoid valve; 304. Connecting pipe; 305. Receiving cavity; 306. Fixing plate; 307. Connecting plate; 308. Partition plate; 309. Arched plate; 310. Mounting hole; 311. First hydraulic cylinder; 312. Rotating seat; 313. Air bladder; 314. Sealing ring; 315. Pulling pipe; 316. Connecting hose; 317. Inlet pipe; 318. Labyrinth plate; 19. Water level sensor; 320. Flow sensor; 321. Collection hole; 4. Dirt filter; 401. Fixing ring; 402. Annular hole; 403. Slip ring; 404. Filter screen; 405. Support plate; 406. Scraper; 407. Connecting rod; 408. Vortex blade; 409. Magnetic ring; 410. Connecting rod; 411. Scraper ring; 412. Iron ring; 413. Welded plate; 414. Second hydraulic cylinder; 415. Ear plate; 5. Suction nozzle; 6. Discharge pipe; 7. Mud pump. Detailed Implementation

[0049] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0050] Reference Figure 1 and Figure 2 As shown, the present invention provides a technical solution: a milling device for trenching a diaphragm wall in a confined aquifer, comprising a support frame 1, two milling wheels 2 for digging trenches are installed on the lower surface of the support frame 1, a suction nozzle 5 for absorbing water and mud is installed on the lower surface of the support frame 1, the suction nozzle 5 is located between the two milling wheels 2, the upper end of the suction nozzle 5 is connected to a discharge pipe 6, and a mud pump 7 for providing suction power is installed on the outer wall of the discharge pipe 6;

[0051] It also includes a surge protection device 3, which acts as a surge protection seal, and a dirt filter device 4 is provided on the inner wall of the connecting pipe 302.

[0052] The following section will explain the specific setup and function of its anti-surge device 3 and dirt filtration device 4.

[0053] Reference Figures 3 to 7 As shown in this embodiment: the anti-surge device 3 includes a water bladder 301 for sealing the gap between the support frame 1 and the tank wall, a connecting pipe 302, a solenoid valve 303, and a connecting pipe 304 for injecting water into the water bladder 301. The water bladder 301 is configured as a rectangular ring structure. The inner ring of the water bladder 301 is fixedly connected to the side wall of the support frame 1. One end of the connecting pipe 304 is connected to the upper surface of the water bladder 301, and the other end of the connecting pipe 304 is connected to the water outlet of the solenoid valve 303. The two ends of the connecting pipe 302 are respectively connected to the water inlet of the solenoid valve 303 and the discharge pipe 6. The connecting pipe 302 is located above the mud pump 7. A flow sensor 320 for monitoring the flow rate inside the discharge pipe 6 is installed on the outer wall of the discharge pipe 6. By setting up the anti-surge device 3, the solenoid valve 303 can be automatically opened when the flow sensor 320 detects an abnormal flow in the discharge pipe 6. The mud in the discharge pipe 6 is used to quickly inject water into the water bag 301 to expand, thereby sealing the gap between the support frame 1 and the trench wall in time, effectively suppressing the upward surge of pressurized water, and preventing the pressurized water from carrying away the mud in the trench wall and causing collapse, thus ensuring the safety of trenching construction.

[0054] Both sides of the outer ring of the water bladder 301 are recessed inward to form a receiving cavity 305. The inner wall of the receiving cavity 305 is fixedly connected to a fixing plate 306 for driving the extension and retraction of the water bladder 301 and supporting the water bladder 301. A connecting plate 307 is fixedly connected to the upper surface of the fixing plate 306. Two partitions 308 are fixedly connected to both sides of the outer wall of the support frame 1. The four partitions 308 are divided into two groups of two. The sides of the two groups of partitions 308 are slidably provided with arched plates 309 for driving the connecting plate 307 to move laterally. The lower surfaces of the two arched plates 309 are respectively connected to the upper surfaces of the two connecting plates 307. Mounting holes 310 are opened on both sides of the outer wall of the support frame 1. A first hydraulic cylinder 311 is rotatably connected to one side of the inner wall of the mounting hole 310. A rotating seat 312 is rotatably connected to the output end of the first hydraulic cylinder 311. The rotating seat 312 is fixedly connected to the upper surface of the arched plate 309. The first hydraulic cylinder 311 drives the rotating seat 312, thereby causing the arched plate 309 to move laterally. The arched plate 309 drives the fixed plate 306 to move, adjusting the extension range of the water bladder 301. This allows it to adapt to different tank walls and effectively support the water bladder 301, ensuring a good seal. Both sides of the outer wall of the support frame 1 have storage holes 321 for accommodating the arched plate 309. The storage holes 321 correspond in position and size to the arched plate 309. The storage holes 321 can accommodate the arched plate 309, reducing the overall width of the device, preventing parts from rubbing against the tank wall, and improving the passage of the equipment during lifting. A single air bladder 313 is fixedly connected between one side of the two fixed plates 306 and the outer ring of the water bladder 301. A sealing ring 314 is fixedly connected to the outer wall of the air bladder 313 to improve the seal between the tank wall and the air bladder 313. The water bladder 301 and the sealing ring 314 form a secondary sealing structure, which further seals the water leakage gaps and buffers the contact pressure, protecting the water bladder 301 from wear.

[0055] The anti-surge device 3 also includes a suction pipe 315, which is fixedly installed inside the water bladder 301. Both ends of the suction pipe 315 penetrate the upper and lower surfaces of the water bladder 301 and extend outwards. The suction pipe 315 is used to drain the surging water between the water bladder 301 and the bottom wall of the tank. A connecting hose 316 is fixedly connected to the upper end of the suction pipe 315, and a funnel-shaped inlet pipe 317 is fixedly connected to the lower end. When using the suction pipe 315, the connecting hose 316 needs to be connected to the pump body on the ground to facilitate timely drainage of the surging water. Used in conjunction with the device's original suction nozzle 5, it effectively reduces the water pressure at the bottom of the tank and prevents the water bladder 301 from being lifted by the high-pressure water flow. Several labyrinth plates 318 are fixedly connected to the inner wall of the suction pipe 315. The labyrinth plates 318 are spaced apart along the axial direction of the suction pipe 315, and adjacent labyrinth plates 318 are staggered to form a labyrinthine flow channel to reduce the flow velocity of the surging water. The staggered arrangement of the labyrinth plates 318 forms a tortuous flow channel, which slows down the flow velocity and weakens the impact force of the water flow.

[0056] Several water level sensors 319 are installed on the lower surface of the water tank 301 to monitor the water level. The water level sensors 319 monitor the water level changes in the tank in real time, promptly grasp the water inflow situation, and work in conjunction with the flow sensor 320 to facilitate the staff to adjust the equipment parameters and deal with sudden water inflow problems.

[0057] The lower surface of the water bladder 301 is fixedly connected to a discharge pipe with a valve, which is used to discharge the medium inside the water bladder 301 after the operation is completed.

[0058] Reference Figures 8 to 10 As shown, in this embodiment: the dirt filtration device 4 includes a fixing ring 401, which is fixed to the inner wall of the connecting pipe 302. A filter screen 404 for filtering dirt is fixedly connected to the inner wall of the fixing ring 401. An annular hole 402 is provided on the side of the fixing ring 401 near the discharge pipe 6. A sliding ring 403 is slidably connected to the inner wall of the annular hole 402. A support plate 405 is fixedly connected to the side of the sliding ring 403 away from the fixing ring 401. A scraper 406 is fixedly connected to the side of the support plate 405 near the filter screen 404. A connecting rod 407 is fixedly connected to one side of the connecting pipe 302. Several vortex blades 408 for driving the connecting rod 407 to rotate are fixedly connected to the arc surface of the connecting rod 407. A magnetic ring 409 is attached to the inner wall of the connecting pipe 302. Several connecting rods 410 are fixedly connected to one side of the magnetic ring 409. One end of the connecting rods 410 is fixedly connected to the same scraper ring 411 for scraping the mud and dirt from the inner wall of the connecting pipe 302. An iron ring 412 is slidably connected to the outer wall of the connecting pipe 302. The iron ring 412 and the magnetic ring 409 are positioned correspondingly and attracted to each other. By setting up the dirt filtration device 4, the filter screen 404 can intercept large particles of dirt in the mud. At the same time, the mud flow drives the vortex blades 408 to drive the scraper 406 to rotate, automatically cleaning the surface of the filter screen 404. Meanwhile, the external iron ring 412 magnetically attracts and drives the scraper ring 411 to move, which can simultaneously remove the mud and dirt attached to the inner wall of the connecting pipe 302, thereby effectively preventing the pipe and solenoid valve 303 from becoming blocked. A welding plate 413 is fixedly connected to the outer wall of the discharge pipe 6. A second hydraulic cylinder 414 is fixedly connected to one side of the welding plate 413. An ear plate 415 is fixedly connected to the output end of the second hydraulic cylinder 414. One side of the ear plate 415 is fixedly connected to the outer wall of the iron ring 412. The second hydraulic cylinder 414 drives the iron ring 412 to move back and forth. With the help of magnetic attraction, the scraper ring 411 cleans the stubborn dirt on the pipe wall, which can achieve pipe cleaning without disassembly, further reducing the risk of the connecting pipe 302 being blocked and reducing the difficulty of equipment maintenance.

[0059] Detailed instructions for use:

[0060] When trenching for diaphragm wall construction is required in confined aquifer strata, the equipment is first started to rotate the two milling wheels 2 mounted on the support frame 1 to cut the strata and complete the trenching operation. Simultaneously, the mud pump 7 is started to provide negative pressure suction, and water and mud are simultaneously sucked from the trench through the suction nozzle 5 located between the two milling wheels 2 below the support frame 1. The mud-water mixture is then discharged outwards through the discharge pipe 6. A flow sensor 320 on the outer wall of the discharge pipe 6 monitors the mud flow rate inside the pipe in real time, allowing for real-time assessment of the confined aquifer strata within the trench. In case of abnormal water inflow, multiple water level sensors 319 installed on the lower surface of the water bladder 301 monitor the water level changes at the bottom of the tank in real time. This, combined with the flow sensor 320, precisely controls the water inflow condition. When an abnormal water inflow is detected, the solenoid valve 303 is opened, allowing water from the discharge pipe 6 to be injected into the rectangular water bladder 301 via the connecting pipe 302 and the connecting pipe 304. This causes the water bladder 301 to expand and seal the gap between the support frame 1 and the tank wall, achieving initial anti-inflow sealing. During this process, [further details can be added]. The actual dimensions of the tank wall are determined. The first hydraulic cylinder 311 within the mounting hole 310 of the start support frame 1 drives the arched plate 309 to slide laterally within the partition plate 308 via the rotating seat 312. This, in turn, moves the connecting plate 307 and the fixing plate 306 inside the accommodating cavity 305, adjusting the extension and retraction range of the water bladder 301 to match the tank wall. A secondary seal is formed using the air bladder 313 between the fixing plate 306 and the outer ring of the water bladder 301, along with the outer wall sealing ring 314. During the lifting and lowering process of the construction equipment, the arched plate 309 is retracted. To avoid scratching, the water flows into the storage holes 321 on both sides of the support frame 1. Simultaneously, the water flows through the extraction pipe 315 inside the water bladder 301, and together with the lower funnel-shaped inlet pipe 317, the water from the bottom of the tank is collected. Then, the water is discharged through the upper connecting hose 316, which reduces the water pressure at the bottom of the tank and prevents the water bladder 301 from being lifted by high pressure. In addition, the labyrinth flow channel is formed by the axially spaced and staggered labyrinth plates 318 inside the extraction pipe 315, which slows down the flow rate of the water and intercepts impurities. This ensures that there is no water inrush or collapse during the entire trenching construction process, and stabilizes the construction environment.

[0061] When the anti-surge device 3 pipeline needs to be filtered for dirt and automatically cleaned, the mud containing sludge and impurities first flows through the inside of the connecting pipe 302. The filter screen 404 installed on the fixing ring 401 on the inner wall of the connecting pipe 302 intercepts and filters large particles of dirt in the mud, preventing impurities from clogging the solenoid valve 303 and the pipeline. Then, the impact force of the mud flow drives the multiple vortex blades 408 on the arc surface of the connecting rod 407 to rotate, causing the support plate 405 and the slip ring 403 to slide and rotate along the inner side of the annular hole 402 of the fixing ring 401. This causes the scraper 406 on one side of the support plate 405 to continuously adhere to the surface of the filter screen 404 and rotate to scrape off the attached dirt. To prevent the filter screen 404 from clogging and affecting the flow of mud, the second hydraulic cylinder 414, fixed by the welded plate 413 on the outer wall of the discharge pipe 6, extends and retracts, driving the iron ring 412 connected to the ear plate 415 to slide back and forth along the outer wall of the connecting pipe 302. Finally, the magnetic attraction between the iron ring 412 and the magnetic ring 409 on the inner wall of the connecting pipe 302 is used to drive the magnetic ring 409 to work with the connecting rod 410 to drive the scraper ring 411 to move back and forth along the inner wall of the connecting pipe 302, thoroughly scraping away the stubborn mud and dirt attached to the inner wall of the pipeline. The entire process achieves automatic cleaning of the pipeline without disassembly, continuously ensuring the smooth flow of the connecting pipe 302, stabilizing the operation of the water bladder 301 water injection anti-surge operation, and reducing the difficulty of equipment maintenance.

[0062] A trenching method for forming a diaphragm wall in a confined aquifer includes the following steps:

[0063] S1. Equipment assembly and debugging: hoist the milling device as a whole to the construction slot, complete the alignment and calibration of support frame 1 and milling wheel 2, connect the connecting hose 316 at the upper end of the extraction pipe 315 to the ground pump body, check the working status of flow sensor 320, water level sensor 319, each hydraulic cylinder and solenoid valve 303, and ensure that each mechanism of the equipment starts and stops normally.

[0064] S2, Trench Milling and Shaping: Start the equipment to drive the two milling wheels 2 at the bottom of the support frame 1 to rotate, and mill and excavate the pressurized water stratum layer by layer. Simultaneously start the mud pump 7 to form negative pressure, and continuously suck up the mud and water generated in the trench through the suction nozzle 5 between the two sets of milling wheels 2, and discharge it to the outside through the discharge pipe 6, and continuously complete the milling and shaping operation of the diaphragm wall trench.

[0065] S3. Real-time water inrush monitoring: Throughout the construction process, the flow rate of the slurry in the pipeline is monitored by the flow sensor 320 on the outer wall of the discharge pipe 6. At the same time, the water level sensor 319 at the bottom of the water bladder 301 collects the water level data at the bottom of the tank in real time. The dual monitoring captures the working conditions such as pressurized water inrush and abnormal water volume in real time, providing accurate data support for anti-inrush control.

[0066] S4. Adaptive anti-surge seal: When an abnormal water inrush is detected, the solenoid valve 303 is automatically opened, allowing the mud in the discharge pipe 6 to be injected into the water bladder 301 through the connecting pipe 302 and the connecting pipe 304, causing the water bladder 301 to expand rapidly and seal the gap between the support frame 1 and the tank wall; according to the actual distance of the tank wall, the first hydraulic cylinder 311 drives the arch plate 309 and the fixed plate 306 to move, adjusting the extension and contraction of the water bladder 301 to match the tank size, and forming a double-layer sealing structure with the air bladder 313 and the sealing ring 314 to completely block the leakage channel of pressurized water, while storing the arch plate 309 in the storage hole 321 to prevent the equipment from scraping against the tank wall when it is raised and lowered;

[0067] S5. Pressure control and drainage at the bottom of the tank: During construction, the water bladder 301 is used to collect the pressurized water at the bottom of the tank through the funnel-shaped inlet pipe 317 at the lower end. After the water is slowed down and stabilized and impurities are intercepted in the labyrinth flow channel formed by the labyrinth plate 318, the water is discharged by the connecting hose 316 in conjunction with the ground pump body. This effectively reduces the water pressure at the bottom of the tank and prevents the high-pressure water from lifting the water bladder 301 and damaging the sealing structure, thus ensuring the stability of the pressure inside the tank.

[0068] S6. Pipeline self-cleaning and unobstructed operation: Throughout the construction process, the mud flows through the connecting pipe 302 and is automatically filtered by the filter screen 404 to remove large particles of impurities. The impact force of the mud fluid drives the vortex blades 408 to rotate, which in turn drives the scraper 406 to dynamically clean the dirt on the filter screen 404. At the same time, the second hydraulic cylinder 414 is intermittently activated to drive the iron ring 412 to slide back and forth. Through magnetic attraction, the magnetic ring 409, connecting rod 410 and scraper ring 411 scrape away stubborn dirt on the inner wall of the connecting pipe 302, continuously keeping the pipeline and solenoid valve 303 unobstructed, ensuring the stable operation of the anti-surge water injection system, and completing the entire safe trenching construction.

Claims

1. A milling device for trenching diaphragm walls in confined aquifers, characterized in that, include: A support frame (1) is provided with two milling wheels (2) for digging grooves installed on the lower surface of the support frame (1) and a suction nozzle (5) for sucking water and mud installed on the lower surface of the support frame (1). The suction nozzle (5) is located between the two milling wheels (2) and the upper end of the suction nozzle (5) is connected to a discharge pipe (6). A mud pump (7) for providing suction power is installed on the outer wall of the discharge pipe (6). Anti-surge device (3), which serves as an anti-surge sealing device, includes a water bladder (301) for sealing the gap between the support frame (1) and the tank wall, a connecting pipe (302), a solenoid valve (303), and a connecting pipe (304) for injecting water into the water bladder (301). The water bladder (301) is configured as a rectangular ring structure, and the inner ring of the water bladder (301) is fixedly connected to the side wall of the support frame (1). The connecting pipe... One end of (304) is connected to the upper surface of the water bag (301), and the other end of the connecting pipe (304) is connected to the water outlet of the solenoid valve (303). The two ends of the connecting pipe (302) are connected to the water inlet of the solenoid valve (303) and the discharge pipe (6) respectively. The connecting pipe (302) is located above the mud pump (7). A flow sensor (320) for monitoring the flow rate inside the discharge pipe (6) is installed on the outer wall of the discharge pipe (6).

2. The device for milling trenches in diaphragm walls of confined aquifers according to claim 1, characterized in that: Both sides of the outer ring of the water bladder (301) are recessed inward to form a receiving cavity (305). The inner wall of the receiving cavity (305) is fixedly connected to a fixing plate (306) for driving the water bladder (301) to extend and support the water bladder (301). A connecting plate (307) is fixedly connected to the upper surface of the fixing plate (306). Both sides of the outer wall of the support frame (1) are fixedly connected to two partitions (308). The four partitions (308) are divided into two groups of two. The sides of the two groups of partitions (308) slide through each other. An arched plate (309) is provided to drive the connecting plate (307) to move laterally. The lower surfaces of the two arched plates (309) are respectively connected to the upper surfaces of the two connecting plates (307). Mounting holes (310) are provided on both sides of the outer wall of the support frame (1). A first hydraulic cylinder (311) is rotatably connected to one side of the inner wall of the mounting hole (310). A rotating seat (312) is rotatably connected to the output end of the first hydraulic cylinder (311). The rotating seat (312) is fixedly connected to the upper surface of the arched plate (309).

3. The device for milling trenches in diaphragm walls of confined aquifers according to claim 2, characterized in that: The support frame (1) has storage holes (321) on both sides of its outer wall for storing the arched plate (309). The storage holes (321) are positioned and matched with the arched plate (309).

4. The device for trenching and milling diaphragm walls in confined aquifers according to claim 2, characterized in that: The same airbag (313) is fixedly connected between one side of the two fixed plates (306) and the outer ring of the water bag (301), and the outer wall of the airbag (313) is fixedly connected to a sealing ring (314) to improve the sealing between the tank wall and the airbag (313).

5. The device for trenching and milling diaphragm walls in confined aquifers according to claim 1, characterized in that: The anti-surge device (3) also includes a suction pipe (315), which is fixedly installed inside the water bladder (301). The two ends of the suction pipe (315) pass through the upper and lower surfaces of the water bladder (301) and extend outward. The suction pipe (315) is used to drain the surging water between the water bladder (301) and the bottom wall of the tank. The upper end of the suction pipe (315) is fixedly connected to a connecting hose (316), and the lower end of the suction pipe (315) is fixedly connected to a funnel-shaped inlet pipe (317).

6. The device for milling trenches in diaphragm walls of confined aquifers according to claim 5, characterized in that: The inner wall of the extraction pipe (315) is fixedly connected with several labyrinth plates (318). The labyrinth plates (318) are distributed at intervals along the axial direction of the extraction pipe (315). Adjacent labyrinth plates (318) are arranged in an alternating manner to form a labyrinth flow channel, which is used to reduce the flow rate of the gushing water.

7. The device for trenching and milling diaphragm walls in confined aquifers according to claim 1, characterized in that: The lower surface of the water bladder (301) is equipped with several water level sensors (319) for monitoring the water level of the gushing water.

8. The device for trenching and milling diaphragm walls in confined aquifers according to claim 1, characterized in that: The inner wall of the connecting pipe (302) is provided with a dirt filtering device (4). The dirt filtering device (4) includes a fixing ring (401), which is fixed to the inner wall of the connecting pipe (302). A filter screen (404) for filtering dirt is fixedly connected to the inner wall of the fixing ring (401). An annular hole (402) is opened on the side of the fixing ring (401) near the discharge pipe (6). A sliding ring (403) is slidably connected to the inner wall of the annular hole (402). A support plate (405) is fixedly connected to the side of the sliding ring (403) away from the fixing ring (401). A scraper (404) is fixedly connected to the side of the support plate (405) near the filter screen (404). 6) A connecting rod (407) is fixedly connected to one side of the support plate (405). Several vortex blades (408) for driving the connecting rod (407) to rotate are fixedly connected to the arc surface of the connecting rod (407). A magnetic ring (409) is attached to the inner wall of the connecting pipe (302). Several connecting rods (410) are fixedly connected to one side of the magnetic ring (409). One end of several connecting rods (410) is fixedly connected to the same scraper ring (411) for scraping off the mud and dirt on the inner wall of the connecting pipe (302). An iron ring (412) is slidably connected to the outer wall of the connecting pipe (302). The iron ring (412) and the magnetic ring (409) are positioned opposite each other and attracted to each other.

9. The device for milling trenches in diaphragm walls of confined aquifers according to claim 8, characterized in that: A welding plate (413) is fixedly connected to the outer wall of the discharge pipe (6). A second hydraulic cylinder (414) is fixedly connected to one side of the welding plate (413). An ear plate (415) is fixedly connected to the output end of the second hydraulic cylinder (414). One side of the ear plate (415) is fixedly connected to the outer wall of the iron ring (412).

10. A trenching method for forming a diaphragm wall in a confined aquifer, applied to the trenching milling apparatus for a diaphragm wall in a confined aquifer as described in any one of claims 1-9, characterized in that, Includes the following steps: S1. Equipment assembly and debugging: The milling device is hoisted and lowered to the construction site. The alignment and calibration of the support frame (1) and milling wheel (2) are completed. The connecting hose (316) at the upper end of the extraction pipe (315) is connected to the ground pump body. The working status of the flow sensor (320), water level sensor (319), hydraulic cylinders and solenoid valves (303) are checked to ensure that the equipment mechanisms start and stop normally. S2, Trench milling and forming: Start the equipment to drive the two milling wheels (2) at the bottom of the support frame (1) to rotate, and mill and excavate the pressurized water stratum layer by layer. Simultaneously start the mud pump (7) to form negative pressure, and continuously suck up the mud and water generated in the trench through the suction nozzle (5) between the two sets of milling wheels (2), and discharge it to the outside through the discharge pipe (6) to continuously complete the milling and forming operation of the diaphragm wall trench; S3. Real-time water inrush monitoring: During the entire construction process, the flow rate of the pipeline mud is monitored by the flow sensor (320) on the outer wall of the discharge pipe (6), and the water level sensor (319) at the bottom of the water bladder (301) is used to collect the water level data at the bottom of the tank in real time. The dual monitoring captures the working conditions such as pressurized water inrush and abnormal water volume in real time, providing accurate data support for anti-inrush control. S4, Adaptive anti-surge seal: When an abnormal surge of water is detected, the solenoid valve (303) is automatically opened, so that the mud in the discharge pipe (6) is injected into the water bag (301) through the connecting pipe (302) and the connecting pipe (304), so that the water bag (301) expands quickly to seal the gap between the support frame (1) and the tank wall; according to the actual distance of the tank wall, the arch plate (309) and the fixed plate (306) are moved by the first hydraulic cylinder (311), and the extension and contraction of the water bag (301) is adjusted to match the tank size. The air bag (313) and the sealing ring (314) form a double-layer sealing structure to completely block the leakage channel of pressurized water. At the same time, the arch plate (309) is stored in the storage hole (321) to avoid the equipment lifting and scraping the tank wall; S5. Pressure control and drainage at the bottom of the tank: During construction, the water bladder (301) is used to draw water through the internal through-hole pipe (315). The water is collected in a large area through the lower funnel-shaped inlet pipe (317). After the water is decelerated and stabilized by the labyrinth flow channel formed by the labyrinth plate (318) and impurities are intercepted, the water is discharged by the connecting hose (316) in conjunction with the ground pump body. This effectively reduces the water pressure at the bottom of the tank, prevents high-pressure water from lifting the water bladder (301) and damaging the sealing structure, and ensures the stability of the pressure inside the tank. S6. Pipeline self-cleaning and unobstructed operation: Throughout the construction process, the mud flows through the connecting pipe (302) and automatically filters large particles of impurities through the filter screen (404). The impact force of the mud fluid drives the vortex blades (408) to rotate, which in turn drives the scraper (406) to dynamically clean the dirt on the filter screen (404). At the same time, the second hydraulic cylinder (414) is intermittently activated to drive the iron ring (412) to slide back and forth. Through magnetic attraction, the magnetic ring (409), connecting rod (410) and scraper ring (411) scrape away the stubborn mud on the inner wall of the connecting pipe (302), continuously keeping the pipeline and the solenoid valve (303) unobstructed, ensuring the stable operation of the anti-surge water injection system, and completing the entire safe trenching construction.

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