A large foundation pit construction ground drainage device

Abstract

The application provides a large foundation pit construction land drainage device, and relates to the technical field of foundation pit drainage. The device comprises a drainage installation part, a row of sealing parts installed on the drainage installation part, a row of the sealing parts used for docking dewatering wells, a row of opening and closing control parts respectively installed on the sealing parts, a row of support installation parts installed on the drainage installation part, a row of settlement protection parts respectively installed on the support installation parts, and a sealing control part installed on the drainage installation part. The drainage installation part is used in combination with the sealing part to drain the accumulated water in the row of dewatering wells in the actual foundation pit drainage work, so that the water pump is not frequently moved, and the problems that the current large foundation pit construction land drainage device is not convenient for unified drainage of the row of dewatering wells and automatic control of the settlement protection are solved.

Description

Technical Field

[0001] This invention relates to the field of foundation pit drainage technology, and in particular to a drainage device for large foundation pit construction sites. Background Technology

[0002] In actual roadbed pipeline laying and other work, deep foundation pits need to be excavated before pipeline laying. After the actual deep foundation pit is excavated, cofferdam steel sheet piles are usually used for cofferdam reinforcement. Deep foundation pits after cofferdams often have water seepage problems. It is necessary to excavate a row of dewatering wells in the foundation pit and insert steel cylinders for protection to drain the water accumulated in the dewatering wells. Current drainage devices for large foundation pit construction sites usually require pumping water from each dewatering well one by one. After the last dewatering well drains, the first dewatering well is prone to overflowing again. It is not convenient to drain the row of dewatering wells at the same time. At the same time, it is not convenient to automatically control the anti-settlement protection. Traditional drainage methods are prone to causing the foundation pit dewatering wells to settle after the drainage speed is too fast or excessive. Continuing to drain will directly affect the safety of the foundation pit. Summary of the Invention

[0003] This disclosure relates to a drainage device for large-scale foundation pit construction sites, which solves the problems that current drainage devices for large-scale foundation pit construction sites are not convenient for unified drainage of rows of dewatering wells, and are also not convenient for automatic control of settlement protection.

[0004] In a first aspect, this disclosure provides a drainage device for large foundation pit construction, specifically including a drainage installation component. A row of sealing components is installed on the drainage installation component; the row of sealing components is used to connect to dewatering wells; opening and closing control components are respectively installed on the row of sealing components; a row of support installation components is installed on the drainage installation component, and settlement protection components are respectively installed on the row of support installation components; a closing control component is installed on the drainage installation component; the drainage installation component includes: a drainage rigid pipe, a connecting flexible hose, and a suction branch pipe; the drainage rigid pipe is arranged in a row, and the rows of drainage rigid pipes are fixedly connected by a row of connecting flexible hoses; the rows of drainage rigid pipes are interconnected; the end of the drainage rigid pipe is a blind pipe; and suction branch pipes are respectively fixedly installed at the bottom of the row of drainage rigid pipes.

[0005] In at least some embodiments, the drainage installation further includes: a sealing ring and a clamping frame, with the same structure on a row of suction branch pipes; a sealing ring is fixedly installed at the bottom of the suction branch pipe, and the bottom of the sealing ring has a sloping structure; two clamping frames are fixedly installed on the suction branch pipe, and the bottom of the two clamping frames is provided with a slot; the slot at the bottom of the clamping frame is used to insert the steel cylinder of the dewatering well.

[0006] In at least some embodiments, the closure includes: a closure mounting bracket, a closure plunger, a magnetic cylinder, and an electromagnet. The closure mounting bracket is fixedly installed at the bottom of the suction branch pipe. The closure plunger is slidably inserted into the closure mounting bracket, and the top of the closure plunger has a beveled structure. The top of the closure plunger is attached to the closure ring. A spring is sleeved on the closure plunger, and the spring sleeved on the closure plunger is connected between the closure plunger and the closure mounting bracket. The bottom of the closure mounting bracket is threadedly connected to the magnetic cylinder, and an electromagnet is fixedly installed on the magnetic cylinder, with the electromagnet aligned with the bottom of the closure plunger. The closure mounting bracket has two through slots.

[0007] In at least some embodiments, the opening and closing control component includes: a fixing ring, a buoyancy ring, a protective switch, and a rubber sleeve. The fixing ring is fixedly installed on the suction branch pipe. The buoyancy ring is slidably sleeved on the suction branch pipe and has a hollow structure. The protective switch is fixedly installed at the bottom of the fixing ring and is located above the buoyancy ring. The rubber sleeve is sleeved on the fixing ring, and the bottom of the rubber sleeve is sleeved on the buoyancy ring. The protective switch is electrically connected to an electromagnet.

[0008] In at least some embodiments, the support installation component includes: a support frame, a limiting plate, a threaded cylinder, and a threaded top pressure shaft. The support frame is sleeved on the drainage rigid pipe. Two limiting plates are fixedly installed at the bottom of the support frame, and the two limiting plates are respectively located on both sides of the drainage rigid pipe. Two through slots are provided on the limiting plates, and the clamping frame is located in the two through slots on the limiting plates. Two threaded cylinders are fixedly installed on the support frame, and two threaded top pressure shafts are threadedly connected to the two threaded cylinders. Each of the two threaded top pressure shafts is provided with a handwheel.

[0009] In at least some embodiments, the support mounting component further includes: a rubber elastic ring and a support switch, wherein the rubber elastic ring is fixedly mounted on each of the two threaded pressing shafts; and the support switch is fixedly mounted on each of the two threaded pressing shafts, with the end of the support switch located inside the rubber elastic ring.

[0010] In at least some embodiments, the settlement protection component includes: a mounting shell and a pressure switch, wherein the mounting shell is fixedly mounted on the support frame; and the pressure switch is fixedly installed inside the mounting shell.

[0011] In at least some embodiments, the settlement protection component further includes: a lower pressure cover, which is slidably sleeved inside the mounting shell; the end of the lower pressure switch presses against the lower pressure cover; a spring is sleeved inside the lower pressure cover, and the spring inside the lower pressure cover is connected between the lower pressure cover and the mounting shell; the end of the lower pressure cover presses against the drainage rigid pipe.

[0012] In at least some embodiments, the closure control includes a suction mounting pipe, which is fixedly mounted on a drainage rigid pipe.

[0013] In at least some embodiments, the sealing control further includes: a solenoid valve, which is fixedly mounted on the suction mounting tube; the solenoid valve is electrically connected to a pressure switch and a support switch.

[0014] This invention provides a drainage device for large-scale foundation pit construction, which has the following beneficial effects:

[0015] This invention employs drainage installation components in conjunction with sealing components, enabling the discharge of accumulated water from rows of dewatering wells during actual foundation pit drainage operations. This avoids frequent pump relocation and also helps improve drainage efficiency. The structure, combined with opening and closing control components, can automatically detect water levels and control the opening and closing of suction branch pipes. It can automatically control each suction branch pipe to ensure there is accumulated water in the dewatering well before drainage begins. The independently controllable opening and closing components ensure smooth drainage from multiple dewatering wells simultaneously. Some dewatering wells can automatically close their corresponding suction branch pipes after the accumulated water is discharged, while the remaining suction branch pipes can continue to drain water.

[0016] Furthermore, the use of support installation components can restrict workers from using threaded jacking to support the sheet piles during the installation of drainage components, thus providing auxiliary reinforcement and reducing the risk of cofferdam collapse caused by pit settlement. The use of settlement protection components can assist in monitoring pit settlement when pit drainage is required, preventing the failure to detect pit settlement during or before drainage work. Continuing drainage when pit settlement occurs will exacerbate the settlement and increase safety hazards. This structure can automatically control the cessation of drainage when pit settlement occurs, ensuring drainage safety. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.

[0018] The accompanying drawings described below are only related to some embodiments of the invention and are not intended to limit the invention.

[0019] In the attached diagram:

[0020] Figure 1 A schematic diagram of the overall structure of a drainage device for large foundation pit construction sites according to this application is shown;

[0021] Figure 2 This invention provides a schematic diagram of the overall bottom structure of a drainage device for large foundation pit construction sites.

[0022] Figure 3 This application shows a cross-sectional view of the internal overall structure of a drainage device for large foundation pit construction sites.

[0023] Figure 4 A schematic diagram of the overall structure of the enclosure control component of this application is shown;

[0024] Figure 5 A schematic diagram of the overall structure of the drainage installation component of this application is shown;

[0025] Figure 6 This application shows Figure 5 Enlarged view of the structure of the middle F region;

[0026] Figure 7 A schematic diagram of the overall structure of the opening and closing control component of this application is shown;

[0027] Figure 8 A schematic diagram of the overall structure of the support installation component of this application is shown;

[0028] Figure 9 This application shows Figure 3 Enlarged view of the structure of the K-region;

[0029] Figure 10 This application shows Figure 3 Enlarged view of the structure of the L region.

[0030] List of reference numerals

[0031] 1. Drainage installation components; 101. Drainage rigid pipe; 1011. Connecting flexible hose; 102. Suction branch pipe; 1021. Sealing ring; 103. Clamping frame; 2. Sealing components; 201. Sealing mounting frame; 202. Sealing plunger; 203. Magnetic cylinder; 204. Electromagnet; 3. Opening and closing control components; 301. Fixing ring; 302. Buoyancy ring; 303. Protective switch; 304. Rubber sleeve; 4. Support installation components; 401. Support frame; 402. Limiting plate; 403. Threaded cylinder; 404. Threaded top pressure shaft; 405. Rubber elastic ring; 406. Support switch; 5. Settlement protection components; 501. Mounting shell; 502. Downward switch; 503. Downward pressure cover; 6. Sealing control components; 601. Suction installation pipe; 602. Solenoid valve. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Example 1: Please refer to Figures 1 to 10 :

[0034] This invention proposes a drainage device for large-scale foundation pit construction, comprising a drainage installation component 1, on which a row of sealing components 2 are installed; the row of sealing components 2 is used to connect to dewatering wells; opening and closing control components 3 are respectively installed on the row of sealing components 2; a row of support installation components 4 are installed on the drainage installation component 1, and settlement protection components 5 are respectively installed on the row of support installation components 4; a closing control component 6 is installed on the drainage installation component 1; the drainage installation component 1 includes: a drainage rigid pipe 101, a connecting flexible hose 1011, and a suction branch pipe 102, the drainage rigid pipe 101 is arranged in a row, and the row of drainage rigid pipes 101 are fixedly connected to each other through a row of connecting flexible hoses 1011; the row of drainage rigid pipes 101 are interconnected; the end drainage rigid pipe 101 is a blind pipe; and suction branch pipes 102 are respectively fixedly installed at the bottom of the row of drainage rigid pipes 101.

[0035] In this embodiment, the drainage installation component 1 further includes: a sealing ring 1021 and a clamping frame 103, with identical structures on a row of suction branch pipes 102; a sealing ring 1021 is fixedly installed at the bottom of the suction branch pipe 102, and the bottom of the sealing ring 1021 has a sloping structure; two clamping frames 103 are fixedly installed on the suction branch pipe 102, and the bottoms of the two clamping frames 103 are respectively provided with slots; the slots at the bottom of the clamping frames 103 are used to insert the steel cylinder of the dewatering well; the sealing component 2 includes: a sealing mounting frame 201, a sealing plunger 202, a magnetic cylinder 203, and an electromagnet 204; the sealing mounting frame 201 is fixedly installed at the bottom of the suction branch pipe 102; a sealing plunger 202 is slidably inserted into the sealing mounting frame 201, and the top of the sealing plunger 202 has a sloping structure. The top of the sealing plunger 202 is attached to the sealing ring 1021; a spring is sleeved on the sealing plunger 202, and the spring sleeved on the sealing plunger 202 is connected between the sealing plunger 202 and the sealing mounting bracket 201; a magnetic cylinder 203 is threadedly connected to the bottom of the sealing mounting bracket 201, and an electromagnet 204 is fixedly installed on the magnetic cylinder 203, and the electromagnet 204 is aligned with the bottom of the sealing plunger 202; the sealing mounting bracket 201 is provided with two through slots; the opening and closing control component 3 includes: a fixing ring 301, a buoyancy ring 302, a protective switch 303, and a rubber sleeve 304. The fixing ring 301 is fixedly installed on the suction branch pipe 102; the buoyancy ring 302 is slidably sleeved on the suction branch pipe 102, and the buoyancy ring 302 has a hollow structure; the bottom of the fixing ring 301... A protective switch 303 is fixedly installed above the buoyancy ring 302. A rubber sleeve 304 is fitted onto the fixed ring 301, and the bottom of the rubber sleeve 304 is fitted onto the buoyancy ring 302. The protective switch 303 is electrically connected to the electromagnet 204. Using the drainage mounting component 1 and the sealing component 2, it can discharge accumulated water in rows of dewatering wells during actual foundation pit drainage work, improving drainage flexibility, avoiding frequent pump movement, and also helping to improve drainage efficiency. This structure, together with the opening and closing control component 3, can automatically detect the water level and automatically control the opening and closing of the suction branch pipes 102. It can automatically control each suction branch pipe 102 to ensure that there is accumulated water in the dewatering well before drainage work begins, utilizing independently controllable opening and closing... Control component 3 ensures smooth drainage when multiple dewatering wells are drained simultaneously. After some dewatering wells have drained their accumulated water, the corresponding suction branch pipe 102 can be automatically shut off, while the remaining suction branch pipes 102 can continue to drain water. The structure is simple and reasonable. When the water level in the dewatering well drops close to the bottom of the suction branch pipe 102, the buoyancy cannot push the buoyancy ring 302 up. At this time, the protection switch 303 can control the electromagnet 204 to be de-energized. Then, under the pressure of the spring on the sealing plunger 202, the sealing plunger 202 can move up and fit against the sealing ring 1021, sealing the suction branch pipe 102 at the dewatering well that has finished draining water. This does not affect the continued pumping of water by the corresponding suction branch pipe 102 of the other dewatering wells that have not yet finished draining water. The control is simple and flexible, ensuring that the accumulated water in the dewatering wells can be drained in a row.

[0036] In this embodiment, the support mounting component 4 includes: a support frame 401, a limiting plate 402, a threaded cylinder 403, and a threaded top pressure shaft 404. The support frame 401 is sleeved on the drainage rigid pipe 101. Two limiting plates 402 are fixedly installed at the bottom of the support frame 401, and the two limiting plates 402 are respectively located on both sides of the drainage rigid pipe 101. Two through slots are provided on the limiting plates 402, and the clamping frame 103 is located in the two through slots on the limiting plates 402. Two threaded cylinders 403 are fixedly installed on the support frame 401, and two threaded top pressure shafts 404 are threadedly connected to the two threaded cylinders 403. Each of the two threaded top pressure shafts 404 is provided with a handwheel. The support mounting component 4 also includes: a rubber elastic ring 405 and a support switch 406. A rubber elastic ring 405 is fixedly installed on each of the two threaded top pressure shafts 404. Support switches 406 are fixedly installed on 04, and the ends of support switches 406 are located inside rubber elastic rings 405. The use of support installation parts 4 can restrict workers from supporting steel sheet piles through threaded top pressure shafts 404 when installing drainage installation parts 1, thus playing an auxiliary role in reinforcement and reducing the risk of collapse of the cofferdam caused by pit settlement. The operation is simple. At the same time, the fixed support frame 401 can facilitate subsequent monitoring of pit settlement and effectively ensure the safety of pumping. Before installing drainage hard pipe 101 to drain water, in order to open solenoid valve 602, both switch 502 and support switch 406 need to be opened at the same time. At this time, the two threaded top pressure shafts 404 need to be rotated to extend and elastically fit against the steel sheet piles on both sides through rubber elastic rings 405. Only after the rubber elastic rings 405 elastically squeeze, will the steel sheet piles squeeze the support switch 406.

[0037] In Example 2, based on Example 1, the settlement protection component 5 includes: a mounting shell 501 and a pressure switch 502. The mounting shell 501 is fixedly mounted on the support frame 401; the pressure switch 502 is fixedly mounted inside the mounting shell 501. The settlement protection component 5 also includes: a pressure cover 503, which is slidably sleeved inside the mounting shell 501; the end of the pressure switch 502 presses against the pressure cover 503; a spring is sleeved inside the pressure cover 503, and the spring inside the pressure cover 503 is connected between the pressure cover 503 and the mounting shell 501; the end of the pressure cover 503 presses against the drainage hard pipe 101. The sealing control component 6 includes: a suction installation pipe 601, which is fixedly mounted on the drainage hard pipe 101; a flange is provided at the end of the suction installation pipe 601. The sealing control component 6 also includes: a solenoid valve 602, which is fixedly mounted on the suction installation pipe 601. The solenoid valve 602 is electrically connected to the pressure switch 502 and the support switch 406. The settlement protection component 5 assists in monitoring the settlement of the foundation pit when drainage is required, preventing the failure to detect pit subsidence during or before drainage work. Continuing drainage when subsidence occurs exacerbates the subsidence and increases safety hazards. This structure automatically stops drainage when subsidence is present, ensuring drainage safety without the need for tedious manual measurements, making it more intuitive and effective, and reducing safety risks. Before the threaded top pressure shaft 404 extends and presses against the sheet pile, the support frame 401 needs to be pressed against the drainage hard pipe 101 before tightening the threaded top pressure shaft 404 to ensure the pressure switch 502 is under pressure. When the support frame 401 is pressed against the drainage hard pipe 101, the pressure cover 503 is pushed upwards to press the pressure switch 502, at which point the solenoid valve 602 can open normally.

[0038] The working principle of this embodiment is as follows: First, the drainage rigid pipe 101 is placed at the bottom of the foundation pit. The slot at the bottom of the clamping frame 103 is inserted into the edge of the dewatering well steel cylinder for auxiliary positioning. The two threaded top pressure shafts 404 corresponding to each drainage rigid pipe 101 are rotated out and elastically attached to the steel sheet piles on both sides through the rubber elastic ring 405. After the rubber elastic ring 405 elastically compresses, the steel sheet piles will compress the support switch 406. The power is turned on by controlling the support switch 406. At this time, the support frame 401 is above the drainage rigid pipe 101. Before the threaded top pressure shaft 404 extends and compresses and positions itself on the steel sheet pile, the support frame 401 needs to be pressed down to fit the drainage rigid pipe 101 before the threaded top pressure shaft 404 is tightened to ensure that the pressure switch 502 is in a compressed state. When the support frame 401 is pressed down to fit the drainage rigid pipe 101, the pressure cover 503 will be pressed upward to press the pressure switch 502. When the support switch 406 and the pressure switch 502 are pressed at the same time... Only when the solenoid valve 602 can be opened normally can water be pumped by connecting the pump to the flange at the end of the suction installation pipe 601. When the water level in each dewatering well is high or even overflows, the buoyancy control buoyancy ring 302 moves upward to squeeze the protection switch 303. At this time, the protection switch 303 can control the electromagnet 204 to be electromagnetically attracted to the closing plunger 202 to move downward, compressing the spring on the outside of the closing plunger 202. At this time, the closing plunger 202 will not be in contact with the closing ring 1021. However, when the water level in the dewatering well drops and approaches the bottom of the suction branch pipe 102, the buoyancy cannot push the buoyancy ring 302 upward. At this time, the protection switch 303 can control the electromagnet 204 to be de-energized. At this time, under the compression of the spring on the closing plunger 202, the closing plunger 202 can move upward to fit the closing ring 1021, sealing the suction branch pipe 102 at the dewatering well that has been drained, without affecting the continued pumping of water by the corresponding suction branch pipe 102 of the other dewatering wells that have not yet been drained.

[0039] When localized subsidence of the dewatering well occurs, the threaded jacking shaft 404 presses and positions itself on the sheet pile, while the drainage pipe 101 sinks with the ground. At this time, the lower pressure cover 503 is also pressed down by the internal spring, moving down to keep it in contact with the drainage pipe 101. However, at this time, the lower pressure switch 502 is no longer pressed, which can control the solenoid valve 602 to close and stop the drainage. Timely backfilling of the foundation pit is required. When the staff observes that the drainage has stopped, they need to carry out inspection work in a timely manner.

[0040] The following points should be noted in this article:

[0041] 1. The accompanying drawings of the embodiments disclosed herein only relate to the structures involved in the embodiments disclosed herein; other structures can be referred to in general design.

[0042] 2. Where there is no conflict, the embodiments of this disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0043] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A drainage device for large foundation pit construction, comprising a drainage installation component (1), wherein a row of sealing components (2) are installed on the drainage installation component (1); characterized in that: A row of the aforementioned sealing components (2) is used to connect to the dewatering well; an opening and closing control component (3) is installed on each of the row of the aforementioned sealing components (2); A row of support installation components (4) is installed on the drainage installation component (1), and a settlement protection component (5) is installed on each row of support installation components (4); a sealing control component (6) is installed on the drainage installation component (1). The drainage installation component (1) includes: a drainage rigid pipe (101), a connecting hose (1011), and a suction branch pipe (102). The drainage rigid pipe (101) is arranged in a row, and the row of drainage rigid pipes (101) is fixedly connected to each other by a row of connecting hoses (1011). The end of the drainage rigid pipe (101) is a blind pipe. Suction branch pipes (102) are fixedly installed at the bottom of the row of drainage rigid pipes (101). The support installation component (4) includes: a support frame (401), a limiting plate (402), a threaded cylinder (403), and a threaded top pressure shaft (404). The support frame (401) is sleeved on the drainage hard pipe (101). Two limiting plates (402) are fixedly installed at the bottom of the support frame (401), and the two limiting plates (402) are located on both sides of the drainage hard pipe (101). Two through slots are provided on the limiting plates (402), and the clamping frame (103) is located in the two through slots on the limiting plates (402). Two threaded cylinders (403) are fixedly installed on the support frame (401), and two threaded top pressure shafts (404) are threadedly connected to the two threaded cylinders (403). Handwheels are provided on the two threaded top pressure shafts (404). The support installation component (4) further includes: a rubber elastic ring (405) and a support switch (406). The rubber elastic ring (405) is fixedly installed on the two threaded top pressure shafts (404); the support switch (406) is fixedly installed on the two threaded top pressure shafts (404), and the end of the support switch (406) is located inside the rubber elastic ring (405). The settlement protection component (5) includes: a mounting shell (501) and a pressure switch (502). The mounting shell (501) is fixedly installed on the support frame (401). The pressure switch (502) is fixedly installed inside the mounting shell (501). The settlement protection component (5) further includes: a lower pressure cover (503), which is slidably sleeved inside the mounting shell (501); the end of the lower pressure switch (502) is pressed against the lower pressure cover (503); a spring is sleeved inside the lower pressure cover (503), and the spring inside the lower pressure cover (503) is connected between the lower pressure cover (503) and the mounting shell (501); the end of the lower pressure cover (503) is pressed against the drainage hard pipe (101).

2. The drainage device for large foundation pit construction as described in claim 1, characterized in that, The drainage installation component (1) further includes: a sealing ring (1021) and a clamping frame (103), which have the same structure on a row of suction branch pipes (102); a sealing ring (1021) is fixedly installed at the bottom of the suction branch pipe (102), and the bottom of the sealing ring (1021) is a sloping structure; two clamping frames (103) are fixedly installed on the suction branch pipe (102), and the bottom of the two clamping frames (103) is respectively provided with a groove.

3. A drainage device for large foundation pit construction as described in claim 2, characterized in that, The sealing component (2) includes: a sealing mounting bracket (201), a sealing plunger (202), a magnetic cylinder (203), and an electromagnet (204). The sealing mounting bracket (201) is fixedly installed at the bottom of the suction branch pipe (102). The sealing plunger (202) is slidably inserted into the sealing mounting bracket (201), and the top of the sealing plunger (202) is a sloping structure. The top of the sealing plunger (202) is attached to the sealing ring (1021). A spring is sleeved on the sealing plunger (202), and the spring sleeved on the sealing plunger (202) is connected between the sealing plunger (202) and the sealing mounting bracket (201). The bottom of the sealing mounting bracket (201) is threadedly connected to the magnetic cylinder (203), and an electromagnet (204) is fixedly installed on the magnetic cylinder (203), and the electromagnet (204) is aligned with the bottom of the sealing plunger (202). The sealing mounting bracket (201) is provided with two through slots.

4. A drainage device for large foundation pit construction as described in claim 3, characterized in that, The opening and closing control component (3) includes: a fixing ring (301), a buoyancy ring (302), a protection switch (303), and a rubber sleeve (304). The fixing ring (301) is fixedly installed on the suction branch pipe (102). The buoyancy ring (302) is slidably sleeved on the suction branch pipe (102), and the buoyancy ring (302) is a hollow structure. The protection switch (303) is fixedly installed at the bottom of the fixing ring (301), and the protection switch (303) is located above the buoyancy ring (302). The rubber sleeve (304) is sleeved on the fixing ring (301), and the bottom of the rubber sleeve (304) is sleeved on the buoyancy ring (302). The protection switch (303) is electrically connected to an electromagnet (204).

5. A drainage device for large foundation pit construction as described in claim 1, characterized in that, The sealing control component (6) includes a suction installation pipe (601), which is fixedly installed on the drainage hard pipe (101).

6. A drainage device for large foundation pit construction according to claim 5, characterized in that, The closed control component (6) further includes: a solenoid valve (602), which is fixedly installed on the suction mounting pipe (601); the solenoid valve (602) is electrically connected to the pressure switch (502) and the support switch (406).

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