Super-large-area deep foundation pit dewatering system

Abstract

The utility model discloses a super large area deep foundation pit dewatering system belongs to the technical field of foundation pit dewatering. Including the water storage tank of setting in the deep foundation pit bottom and the lateral wall junction, the water storage tank extends along the extension direction of deep foundation pit bottom brim, still include: the groove support plate is placed in the water storage tank, and the groove support plate is provided with several, and several groove support plates are arranged side by side along the extension direction of water storage tank, and the water inlet channel is set up in the side of groove support plate extension direction, and the water inlet channel is penetrated to the side of groove support plate. The utility model discloses that several groove support plates are put into the water storage tank in turn, and the baffle should be towards the lateral wall of deep foundation pit, when adjacent groove support plates are connected through the butt joint structure, and the groove support plate supports the lateral wall of water storage tank at the bottom of water storage tank, so as to avoid the collapse of water storage tank lateral wall, and the dewatering system can be guaranteed long time normal operation.

Description

Technical Field

[0001] This utility model relates to a dewatering system for ultra-large area deep foundation pits, belonging to the field of foundation pit dewatering technology. Background Technology

[0002] Dewatering of foundation pits refers to the dewatering work carried out when the groundwater level is higher than the bottom of the excavation pit and groundwater will continuously seep into the pit. This is done to ensure that the foundation pit can be constructed under dry conditions and to prevent slope instability, quicksand in the foundation, pit bottom heave, piping at the bottom of the pit, and a decrease in the bearing capacity of the foundation.

[0003] Conventional foundation pit dewatering often uses open ditch dewatering systems. In actual operation, the open ditch needs to be deeper than the bottom of the foundation pit and be able to hold a sufficient amount of groundwater. Therefore, the open ditch is dug at a relatively deep depth. During the use of the open ditch, vibrations caused by construction and defects in the soil itself can cause the sidewalls of the open ditch to collapse. This can cause the open ditch dewatering system to fail to function properly, thus presenting certain problems. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a dewatering system for ultra-large area deep foundation pits. It solves the problem in the prior art that the sidewalls of open ditches will collapse due to vibrations generated during construction and defects in the soil layer itself, which will cause the open ditch dewatering system to fail to function properly.

[0005] The technical problem to be solved by this utility model is achieved by the following technical solution: a dewatering system for ultra-large area deep foundation pits, including a water storage tank located at the connection between the bottom and sidewalls of the deep foundation pit, the water storage tank extending along the edge of the bottom of the deep foundation pit, and further including:

[0006] A support plate is placed inside the water storage tank. Several support plates are arranged side by side along the extension direction of the water storage tank.

[0007] The water inlet channel is located on the side of the tank support plate along its extension direction, and the water inlet channel runs through the side of the tank support plate.

[0008] A baffle plate is installed inside the water inlet channel to fill and seal the channel.

[0009] A limiting structure is installed inside the water inlet channel to restrict the movement of the baffle plate.

[0010] The docking structure is located at both ends of the tank support plate along the extension direction of the water storage tank. The docking structure is used to connect adjacent tank support plates.

[0011] The trough support plate extends to the outside of the water storage tank at its two opposite ends and bends toward the bottom of the deep pit. The two ends of the trough support plate outside the water storage tank are attached to the bottom of the deep pit. The inner side of the trough support plate is equipped with a pumping device to pump water out of the deep pit.

[0012] By adopting the above technical solution, during the dewatering operation of the foundation pit, a water storage tank is first excavated around the deep foundation pit. Then, several tank support plates are placed into the water storage tank in sequence, with the sealing plates facing the side wall of the deep foundation pit. At this time, adjacent tank support plates are connected by a butt joint structure. The tank support plates support the side wall of the water storage tank at the bottom. When the groundwater level around the deep foundation pit is higher than the bottom of the foundation pit, the sealing plates are removed from the water inlet channel, releasing the restriction structure from the sealing plates. At this time, the groundwater around the deep foundation pit seeps into the water inlet channel through the soil layer and is stored inside the tank support plates. The water accumulated in the tank support plates is then pumped to the outside of the deep foundation pit by a pumping device, achieving the purpose of lowering the groundwater level in the deep foundation pit. At the same time, the support effect of the tank support plates can prevent the side wall of the water storage tank from collapsing, ensuring that the dewatering system can operate normally for a long time.

[0013] The present invention is further configured such that the limiting structure includes:

[0014] A limiting flange is provided at the opening of the water inlet channel facing the outside of the tank support plate. The limiting flange is fixedly installed around the opening of the water inlet channel.

[0015] The limiting plate is fixedly installed at the opening of the water inlet channel facing the inside of the tank support plate.

[0016] By adopting the above technical solution, the movement of the sealing plate is limited by the limiting flange and the limiting plate, so that the sealing plate cannot be removed from the water inlet channel. When the sealing plate applies a large force towards the limiting plate, the limiting plate undergoes elastic deformation and loses its limiting effect on the sealing plate. At this time, the sealing plate can be removed from the water inlet channel, thereby disassembling the sealing plate and allowing the groundwater in the soil layer to enter the interior of the trench support plate through the water inlet channel and be pumped out by the pumping equipment.

[0017] The present invention is further configured such that the docking structure includes:

[0018] The lower stacked edge plate is fixed to the end of the groove support plate.

[0019] The upper stacked edge plate is fixed to the opposite ends of the groove support plate and the lower stacked edge plate.

[0020] Locking parts are respectively provided at both ends of the extension direction of the groove support plate, and the locking parts are used to fix two adjacent groove support plates.

[0021] The present invention is further configured such that the locking part includes:

[0022] The hinged seat is fixed to one end of the slot support plate.

[0023] The mating plate is hinged at one end to the hinge seat, and the end of the mating plate away from the hinge extends in a direction away from the slot support plate.

[0024] The butt joint is fixed at the end of the mating plate away from the hinge and extends towards the slot support plate.

[0025] The mating hole is located at the end of the slot support plate opposite to the hinge seat.

[0026] The butt joint located on the slot support plate can be inserted into the mating hole on the adjacent slot support plate and fix the two slot support plates.

[0027] By adopting the above technical solution, the ends of the two slot support plates are first aligned, so that the upper stacked edge plate of one slot support plate is stacked on the lower stacked edge plate of the other slot support plate. At this time, by flipping the mating plate, the joint is aligned with the opening of the mating hole and the joint is inserted into the mating hole. At this time, the splicing of the two adjacent slot support plates is completed. The joint can undergo elastic deformation during the insertion of the joint into the mating hole, without the need for tools and connectors, thus improving the splicing efficiency of the slot support plates.

[0028] The present invention is further configured such that: two support frames are fixed on the surface of the sealing plate facing the inner side of the groove support plate, and several connecting holes are respectively opened through the two support frames; a slot is opened at the bottom of the inner side of the groove support plate; and a plug-in block that can be inserted into the slot is fixed on the surface of the sealing plate facing the outer side of the groove support plate.

[0029] By adopting the above technical solution, the user can pull the baffle towards the limiting plate by holding the support frame, causing the limiting plate to deform elastically, and finally causing the baffle to come out of the water inlet channel. At this time, the plug on the baffle can be aligned with the slot and inserted into the slot. Then, the baffle can be placed at the bottom of the inner side of the slot support plate. At this time, the pumping equipment can be fixedly installed on the support frame, which improves the stability of the pumping equipment during operation.

[0030] The present invention is further configured as follows: a first storage cavity is provided in the part of the trough support plate extending to the outside of the water storage tank and fitting with the bottom of the deep foundation pit. The first storage cavity is provided with an opening facing away from the bottom of the deep foundation pit. A sliding groove is provided on the opposite end wall of the first storage cavity in the extension direction of the trough support plate. A sliding block is slidably arranged in the sliding groove. A first flip plate is provided between the two sliding blocks and is hinged to the sliding blocks. A second storage cavity is provided on the first flip plate with the same opening orientation as the first storage cavity. A second flip plate is provided inside the second storage cavity. The side of the second flip plate away from the sliding block is hinged to the inner wall of the second storage cavity. A cover plate is detachably and fixedly provided at the opening of the first storage cavity.

[0031] The present invention is further configured such that: the side of the second flip plate away from the opening of the second storage cavity is provided with a tenon groove away from the hinge end of the second flip plate; a splicing plate is provided at the end of the second flip plate away from the hinge; the splicing plate can be inserted into the tenon groove to form a tenon structure; the splicing plate is set to fit against the side wall of the deep foundation pit; splicing holes that can be aligned with each other are provided through the tenon groove and the splicing plate; the splicing plate and the second flip plate are fixed by bolts fasteners inserted into the splicing holes.

[0032] The present invention is further configured such that: a number of reinforcing holes are provided through the splicing plate and the second flip plate, and an anchor rod with its end inserted into the side wall of the deep foundation pit is inserted into the reinforcing hole.

[0033] The beneficial effects of this utility model are as follows: When performing dewatering operations on foundation pits, a water storage tank is first excavated around the deep foundation pit. Then, several tank support plates are placed into the water storage tank in sequence, with the sealing plates facing the side wall of the deep foundation pit. At this time, adjacent tank support plates are connected by a butt joint structure. The tank support plates support the side wall of the water storage tank at the bottom of the tank. When the groundwater level around the deep foundation pit is higher than the bottom of the pit, the sealing plates are removed from the water inlet channel, releasing the restriction structure from the sealing plates. At this time, the groundwater around the deep foundation pit seeps into the water inlet channel through the soil layer and is stored inside the tank support plates. The water accumulated in the tank support plates is then pumped to the outside of the deep foundation pit by a pumping device, achieving the purpose of lowering the groundwater level in the deep foundation pit. At the same time, the support effect of the tank support plates can prevent the side wall of the water storage tank from collapsing, ensuring that the dewatering system can operate normally for a long time. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of this utility model;

[0035] Figure 2 This is a schematic diagram of the structure of the present invention when the first flip plate is flipped out of the first storage cavity;

[0036] Figure 3 This is a schematic diagram of the structure when the splicing plate and the second flip plate are connected in this utility model.

[0037] In the diagram: 10. Groove support plate; 11. Lower stacked edge plate; 12. Upper stacked edge plate; 13. Butt joint hole; 14. Hinge seat; 15. Butt joint plate; 16. Butt joint; 17. Positioning hole; 20. Water inlet channel; 21. Limiting flange; 22. Limiting piece; 23. Sealing plate; 24. Support frame; 25. Connecting hole; 26. Slot; 30. Cover plate; 31. First storage cavity; 32. Sliding groove; 33. Sliding block; 34. First flip plate; 35. Second storage cavity; 36. Second flip plate; 37. Mortise and tenon groove; 38. Splicing hole; 39. Reinforcing hole; 40. Splicing plate. Detailed Implementation

[0038] To facilitate a clear understanding of the technical means, creative features, objectives, and effects of this utility model, the following description, in conjunction with specific illustrations, further elaborates on this utility model.

[0039] like Figure 1-2 As shown, the ultra-large area deep foundation pit dewatering system includes a water storage tank located at the connection between the bottom and side walls of the deep foundation pit. The water storage tank extends along the edge of the bottom of the deep foundation pit. It also includes a tank support plate 10, a water inlet channel 20, a sealing plate 23, a limiting structure, and a docking structure. The tank support plate 10 is placed inside the water storage tank so that it conforms to the contour of the inner wall of the water storage tank. Several tank support plates 10 are provided, arranged side-by-side along the extension direction of the water storage tank. The ends of the tank support plates 10 located on opposite sides of the water storage tank extend to the outside of the water storage tank and bend towards the bottom of the deep foundation pit. The two ends of the tank support plates 10 located outside the water storage tank are attached to the bottom of the deep foundation pit.

[0040] like Figure 1 As shown, the water inlet channel 20 is opened on the side of the tank support plate 10 along its extension direction, and the water inlet channel 20 penetrates through the side of the tank support plate 10. A sealing plate 23 is disposed within the water inlet channel 20 and fills and seals it. Two support frames 24 are fixed to the surface of the sealing plate 23 facing the inner side of the tank support plate 10. Several connecting holes 25 are respectively opened through the two support frames 24. A slot 26 is opened at the bottom of the inner side of the tank support plate 10. A plug-in block that can be inserted into the slot 26 is fixed to the surface of the sealing plate 23 facing the outer side of the tank support plate 10. A limiting structure is disposed within the water inlet channel 20 and restricts the movement of the sealing plate 23. A docking structure is disposed at both ends of the tank support plate 10 along the extension direction of the water storage tank, and the docking structure is used to dock adjacent tank support plates 10.

[0041] The inner side of the trench support plate 10 is provided with a water pumping device to pump water to the outside of the deep foundation pit. The water pumping device includes at least a water pump, a drain pipe and a power unit. The water pump is placed inside the trench support plate 10. One end of the drain pipe is connected to the output end of the water pump, and the other end of the drain pipe extends along the side wall of the deep foundation pit to the water storage tank outside the deep foundation pit. The power unit includes an engine that drives the water pump. The engine is driven by electricity or oil and is connected to an external power source or fuel tank.

[0042] like Figure 1 As shown, the limiting structure includes a limiting flange 21 and a limiting piece 22. The limiting flange 21 is disposed at the opening of the water inlet channel 20 facing the outside of the tank support plate 10. The limiting flange 21 is fixedly disposed around the opening of the water inlet channel 20. The limiting piece 22 is fixedly disposed at the opening of the water inlet channel 20 facing the inside of the tank support plate 10. The limiting piece 22 is made of elastic metal material and can be bent towards the inside of the tank support plate 10 under pressure.

[0043] like Figure 1As shown, the docking structure includes a lower stacked edge plate 11, an upper stacked edge plate 12, and a locking part. The lower stacked edge plate 11 is fixed to the end of the slot support plate 10, and the upper stacked edge plate 12 is fixed to the end of the slot support plate 10 opposite to the lower stacked edge plate 11. The lower stacked edge plates 11 and upper stacked edge plates 12 on two adjacent slot support plates 10 can be stacked on top of each other. The locking parts are respectively provided at both ends of the slot support plate 10 in the extending direction, and the locking parts are used to fix the two adjacent slot support plates 10.

[0044] like Figure 1-2 As shown, the locking part includes a mating hole 13, a hinge seat 14, a mating plate 15, and a coupling joint 16. The hinge seat 14 is fixed to one end of the slot support plate 10. One end of the mating plate 15 is hinged to the hinge seat 14. The end of the mating plate 15 away from the hinge extends in a direction away from the slot support plate 10. The coupling joint 16 is fixed to the end of the mating plate 15 away from the hinge and extends in a direction towards the slot support plate 10; that is, when the mating plate 15 extends in a direction away from the slot support plate 10, the coupling joint 16 extends in a direction towards the slot support plate 10. The coupling joint 16 is made of an elastic material, including rubber. The mating hole 13 is opened at the end of the slot support plate 10 opposite to the hinge seat 14. The mating hole 13 vertically penetrates the slot support plate 10. The coupling joint 16 on the slot support plate 10 can be inserted into the mating hole 13 on an adjacent slot support plate 10, thus fixing the two slot support plates 10.

[0045] like Figure 2-3 As shown, the portion of the trough support plate 10 extending to the outside of the water storage tank and fitting against the bottom of the deep foundation pit has a first storage cavity 31. The first storage cavity 31 has an opening facing away from the bottom of the deep foundation pit. A sliding groove 32 is formed on the opposite end wall of the first storage cavity 31 in the extension direction of the trough support plate 10. A sliding block 33 is slidably disposed in the sliding groove 32. A first flip plate 34 is disposed between the two sliding blocks 33 and hinged to the sliding blocks 33. A second storage cavity 35 is disposed on the first flip plate 34 with the same opening orientation as the first storage cavity 31. A second flip plate 36 is disposed inside the second storage cavity 35. The side of the second flip plate 36 away from the sliding block 33 is hinged to the inner wall of the second storage cavity 35. A cover plate 30 is detachably and fixedly disposed at the opening of the first storage cavity 31.

[0046] The sliding block 33 can slide in the sliding groove 32, so that the hinge end of the first flip plate 34 moves in the first storage cavity 31, thereby changing the shape of the first flip plate 34. That is, the surface of the first flip plate 34 where the second storage cavity 35 is opened can face the opening of the first storage cavity 31 or can be away from the first storage cavity 31.

[0047] like Figure 2-3As shown, the side of the second flip plate 36 away from the opening of the second storage cavity 35 is provided with a mortise and tenon groove 37 away from the hinge end of the second flip plate 36. A splicing plate 40 is provided at the end of the second flip plate 36 away from the hinge. Part of the splicing plate 40 can be inserted into the mortise and tenon groove 37 to form a mortise and tenon structure. The splicing plate 40 is set to fit against the side wall of the deep foundation pit. Splicing holes 38 that can be aligned with each other are provided through the mortise and tenon groove 37 and the splicing plate 40. The splicing plate 40 and the second flip plate 36 are fixed by bolts fasteners inserted into the splicing holes 38.

[0048] like Figure 2-3 As shown, several reinforcing holes 39 are provided through the splicing plate 40 and the second flip plate 36. Anchor rods with their ends inserted into the sidewalls of the deep foundation pit are inserted into the reinforcing holes 39. The splicing plate 40 also has a tenon and mortise groove 37 at the end away from the second flip plate 36. The ends of adjacent splicing plates 40 can be inserted into the tenon and mortise groove 37 to form the same tenon and mortise structure. The parts of the two splicing plates 40 that form the tenon and mortise structure located in the tenon and mortise groove 37 are also provided through the splicing holes 38 that can be aligned with each other. Several splicing holes 38 are provided on the splicing plate 40.

[0049] During the dewatering operation of the foundation pit, a water storage tank is first excavated around the deep foundation pit. Then, several tank support plates 10 are placed into the water storage tank in sequence, with the sealing plate 23 facing the side wall of the deep foundation pit. At this time, adjacent tank support plates 10 are connected by a butt joint structure. The tank support plates 10 support the side wall of the water storage tank at the bottom of the tank. When the groundwater level around the deep foundation pit is higher than the bottom of the foundation pit, the sealing plate 23 is removed from the water inlet channel 20, so that the limiting structure releases the restriction on the sealing plate 23. At this time, the groundwater around the deep foundation pit seeps into the water inlet channel 20 through the soil layer and is stored inside the tank support plate 10. The water accumulated in the tank support plate 10 is then pumped to the outside of the deep foundation pit by a pumping equipment, achieving the purpose of lowering the groundwater level of the deep foundation pit. At the same time, the supporting effect of the tank support plate 10 can prevent the side wall of the water storage tank from collapsing, ensuring that the dewatering system can operate normally for a long time.

[0050] The movement of the baffle plate 23 is limited by the limiting flange 21 and the limiting plate 22, so that the baffle plate 23 cannot be removed from the water inlet channel 20. When the baffle plate 23 applies a strong force to the limiting plate 22, the limiting plate 22 undergoes elastic deformation and loses its limiting effect on the baffle plate 23. At this time, the baffle plate 23 can be removed from the water inlet channel 20, thereby disassembling the baffle plate 23 and allowing the groundwater in the soil layer to enter the trench support plate 10 through the water inlet channel 20 and be pumped out by the pumping equipment.

[0051] First, align the ends of the two trench support plates 10, so that the upper stacked edge plate 12 of one trench support plate 10 is stacked on the lower stacked edge plate 11 of the other trench support plate 10. Then, by flipping the mating plate 15, align the butt joint 16 with the opening of the butt hole 13 and insert the butt joint 16 into the butt hole 13. This completes the splicing of the two adjacent trench support plates 10. The butt joint 16 can undergo elastic deformation and bending during the insertion into the butt hole 13 to adapt to the relative position of 13. No tools or connectors are needed during the butt joint process, which improves the splicing efficiency of the trench support plates 10. Furthermore, after the butt joint 16 is inserted into the butt hole 13, a rod-like object, including a reinforcing bar, can be inserted into the positioning hole 17. This can fix the adjacent trench support plates 10 to the bottom of the deep foundation pit, improving the stability of the trench support plates 10 after installation.

[0052] The user can pull the baffle 23 towards the limiting plate 22 by holding the support frame 24, causing the limiting plate 22 to elastically deform and bend inward towards the tank support plate 10, preventing it from limiting the baffle 23. This allows the baffle 23 to detach from the water inlet channel 20. At this point, the plug on the baffle 23 can be aligned with the slot 26 and inserted into it. The baffle 23 can then be placed at the bottom of the tank support plate 10. The water pump in the pumping equipment can then be fixedly mounted on the support frame 24, and bolts and fasteners can be passed through the connecting hole 25 and fixedly connected to the pump's connection part. The water inlet end of the support frame 24 faces the bottom of the tank support plate 10. Due to the support of the support frame 24, there is always space between the water inlet end of the pump and the baffle 23, preventing the water inlet end of the pump from contacting the inner surface of the tank support plate 10 and affecting the water inlet flow, thus improving the stability of the pumping equipment during operation.

[0053] Due to the considerable depth of the deep foundation pit, the drainage pipes installed on the sidewalls of the pit exhibit poor stability. Furthermore, the soil layer on the sidewalls makes it difficult to secure the drainage pipes. Therefore, the cover plate 30 is removed, and the first flip plate 34 is flipped outwards from the hinge towards the outside of the first receiving cavity 31, causing the second receiving cavity 35 to face upwards. Simultaneously, the second flip plate 36 inside the second receiving cavity 35 is flipped outwards from the hinge towards the outside of the second receiving cavity 35. The splicing plate 40 is then joined with the second flip plate 36. The splicing plate 40 is inserted into the mortise and tenon groove 37 to form a mortise and tenon structure. Bolts are then used to fasten the splicing plate 40 and the mortise and tenon groove 37 through the splicing hole 38. Subsequent splicing plates 40 are then added to the connected splicing plate 40, inserting each subsequent splicing plate 40 into the mortise and tenon groove 37 of the previous splicing plate 40. Bolts are then used to fasten the two splicing plates 40 through the splicing hole 38, thus allowing several splicing plates 40 to extend outwards along the sidewall of the deep foundation pit. At this point, anchor rods are inserted into the reinforcement hole 39 to fix the splicing plate 40 to the sidewall of the deep foundation pit, ensuring the stability of the splicing plate 40. Then, drainage pipes are placed on the splicing plates 40. The drainage pipes are fixed to the splicing plates 40 using clips, with anchor rods passing through both ends of the clips, connecting the clips to the splicing plate 40. The drainage pipe passes through the middle of the clip, completing the fixation between the drainage pipe and the splicing plate 40.

[0054] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments, and various changes and modifications can be made without departing from the spirit and scope of this utility model. All such changes and modifications fall within the scope of protection claimed by this utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A dewatering system for ultra-large area deep foundation pits, comprising a water storage tank located at the connection between the bottom and sidewalls of the deep foundation pit, the water storage tank extending along the edge of the bottom of the deep foundation pit, characterized in that: Also includes: A trough support plate (10) is placed inside the water storage tank. Several trough support plates (10) are provided, and several trough support plates (10) are arranged side by side along the extension direction of the water storage tank. A water inlet channel (20) is provided on the side of the tank support plate (10) in the direction of extension, and the water inlet channel (20) penetrates the side of the tank support plate (10). A baffle plate (23) is installed inside the water inlet channel (20) and fills and seals the water inlet channel (20). A limiting structure is installed inside the water inlet channel (20) to restrict the movement of the baffle plate (23). The docking structure is set at both ends of the tank support plate (10) along the extension direction of the water storage tank. The docking structure is used to dock adjacent tank support plates (10). Among them, the ends of the trough support plate (10) located on both opposite sides of the water storage tank extend to the outside of the water storage tank and bend towards the bottom of the deep foundation pit. The two ends of the trough support plate (10) located outside the water storage tank are attached to the bottom of the deep foundation pit. The inner side of the trough support plate (10) is equipped with a pumping device to pump water out of the deep foundation pit.

2. The ultra-large area deep foundation pit dewatering system according to claim 1, characterized in that: The limiting structure includes: A limiting flange (21) is provided at the opening of the water inlet channel (20) facing the outside of the tank support plate (10). The limiting flange (21) is fixedly arranged around the opening of the water inlet channel (20). The limiting piece (22) is fixedly installed at the opening of the water inlet channel (20) facing the inside of the tank support plate (10).

3. The ultra-large area deep foundation pit dewatering system according to claim 1, characterized in that: The docking structure includes: The lower stacked edge plate (11) is fixed to the end of the groove support plate (10). The upper stacked edge plate (12) is fixed at the end opposite to the lower stacked edge plate (11) of the groove support plate (10). Locking parts are respectively provided at both ends of the extension direction of the groove support plate (10), and the locking parts are used to fix the two adjacent groove support plates (10).

4. The ultra-large area deep foundation pit dewatering system according to claim 3, characterized in that: The locking mechanism includes: The hinge seat (14) is fixed to one end of the slot support plate (10). The mating plate (15) is hinged at one end to the hinge seat (14), and the end of the mating plate (15) away from the hinge extends in a direction away from the slot support plate (10). The butt joint (16) is fixed to the end of the butt plate (15) away from the hinge and extends toward the groove support plate (10). The mating hole (13) is provided at the end opposite to the hinge seat (14) of the slot support plate (10). The connector (16) located on the slot support plate (10) can be inserted into the mating hole (13) on the adjacent slot support plate (10) and fix the two slot support plates (10).

5. The ultra-large area deep foundation pit dewatering system according to claim 1, characterized in that: Two support frames (24) are fixed on the surface of the sealing plate (23) facing the inside of the slot support plate (10). Several connecting holes (25) are opened through the two support frames (24). A slot (26) is opened at the bottom of the inside of the slot support plate (10). A plug-in block that can be inserted into the slot (26) is fixed on the surface of the sealing plate (23) facing the outside of the slot support plate (10).

6. The ultra-large area deep foundation pit dewatering system according to claim 1, characterized in that: The part of the trough support plate (10) extending to the outside of the water storage tank and fitting with the bottom of the deep foundation pit has a first storage cavity (31). The first storage cavity (31) has an opening facing away from the bottom of the deep foundation pit. The first storage cavity (31) has a sliding groove (32) on the opposite end wall in the extension direction of the trough support plate (10). A sliding block (33) is slidably arranged in the sliding groove (32). A first flip plate (34) is provided between the two sliding blocks (33) and is hinged to the sliding block (33). A second storage cavity (35) is provided on the first flip plate (34) with the same opening orientation as the first storage cavity (31). A second flip plate (36) is provided inside the second storage cavity (35). The side of the second flip plate (36) away from the sliding block (33) is hinged to the inner wall of the second storage cavity (35). A cover plate (30) is detachably and fixedly provided at the opening of the first storage cavity (31).

7. The ultra-large area deep foundation pit dewatering system according to claim 6, characterized in that: The second flip plate (36) has a mortise and tenon groove (37) on the side away from the opening of the second storage cavity (35), which is far from the hinge end of the second flip plate (36). A splicing plate (40) is provided at the end of the second flip plate (36) away from the hinge. Part of the splicing plate (40) can be inserted into the mortise and tenon groove (37) to form a mortise and tenon structure. The splicing plate (40) is set to fit against the side wall of the deep foundation pit. The mortise and tenon groove (37) and the splicing plate (40) are provided with splicing holes (38) that can be aligned with each other. The splicing plate (40) and the second flip plate (36) are fixed by bolts fasteners inserted into the splicing holes (38).

8. The ultra-large area deep foundation pit dewatering system according to claim 7, characterized in that: Several reinforcing holes (39) are provided through the splicing plate (40) and the second flip plate (36), and anchor rods with their ends inserted into the side wall of the deep foundation pit are installed in the reinforcing holes (39).

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