Drainage device for foundation pit construction site construction

Abstract

The invention discloses a drainage device for foundation pit construction site construction, and particularly relates to the field of foundation pit construction site construction, the drainage device comprises a high-pressure water pump, the input end of the high-pressure water pump is connected with a connecting pipe, one end of the connecting pipe is connected with a water pumping pipe, the top of the water pumping pipe is provided with a floating plate, and the bottom of the water pumping pipe is fixedly connected with a connecting branch pipe. According to the device, firstly, the water pumping pipe and the connecting plate can descend along with descending of the water level through the arranged floating plate, when water pumping is started, the water pumping end can suspend in water, bottom silt is prevented from being directly pumped away, the blocking time of the porous frame and the filtering cover is shortened, liquid in a foundation pit can be rapidly pumped away, and the water pumping efficiency is improved; meanwhile, in the water pumping process, the scraping frame can scrape impurities on the surfaces of the porous frame and the filtering cover while the connecting plate rotates at the bottom of the water pumping pipe through the automatic cleaning mechanism, the filtering and drainage effects are improved, the dredging frequency is reduced, the project progress is not affected, and the drainage efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of foundation pit construction site, and more specifically, to a drainage device for foundation pit construction site. Background Art

[0002] The foundation pit is an earth pit excavated at the foundation design location according to the base elevation and foundation plane dimensions. During the excavation of the foundation pit, groundwater may sometimes be encountered, causing groundwater to seep out of the foundation pit, thereby accumulating water at the bottom of the foundation pit, affecting the next step of construction. Therefore, when constructing the foundation pit site, a drainage device is needed to drain the interior of the foundation pit.

[0003] When the existing drainage device for foundation pit is draining, the pumping port is directly placed in the deepest part of the foundation pit. When pumping and draining, the bottom mud in the foundation pit will be discharged from the drain pipe together with the water. The pumping pipeline, especially the water inlet position, is easily blocked by dirt, which is not conducive to rapid pumping. The operator is required to clean the water inlet, which is time-consuming and laborious, and reduces the pumping and drainage efficiency. Therefore, after the existing drainage device has been used for a period of time, the drain pipe needs to be pulled out for corresponding dredging, which greatly wastes the relevant manpower, delays the drainage efficiency, and affects the progress of the project. Therefore, a drainage device for foundation pit construction site is proposed. Summary of the invention

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a drainage device for foundation pit construction site to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a drainage device for foundation pit construction site, comprising a high-pressure water pump, an input end of the high-pressure water pump is connected to a connecting pipe, one end of the connecting pipe is connected to a pumping pipe, a floating plate is provided on the top of the pumping pipe, a connecting branch pipe is fixedly connected to the bottom of the pumping pipe, a connecting plate is provided on the bottom of the pumping pipe, and a first stabilizing ring is fixedly connected to the top of the connecting plate; A fixed tube and a filter cover are fixedly connected to the bottom of the connecting plate, a support rod is fixedly connected to the bottom of the inner cavity of the fixed tube, a fixed rod is fixedly connected to the top of the support rod, a spiral blade is fixedly provided on the middle fixed sleeve of the fixed rod, a porous frame is provided on the outside of the filter cover, and an automatic cleaning mechanism is provided between the porous frame and the filter cover.

[0006] In a preferred embodiment, there are multiple water pumping pipes, both ends of which are symmetrically fixedly connected with flanges, a sealing gasket is arranged on one side of the flange, a plurality of mounting holes are opened on the surface of the flange, and a fastening screw is inserted in the middle of the mounting hole.

[0007] In a preferred embodiment, two ends of the bottom of the floating plate are symmetrically fixedly connected with clamps, the clamps are sleeved on the middle of the water pumping pipe, a threaded hole is opened at the bottom end of the clamp, and a fastening screw is inserted in the middle of the threaded hole.

[0008] In a preferred embodiment, the inner cavity of the fixed tube is connected with the inner cavity of the first stabilizing ring through the middle part of the connecting plate, the inner cavity diameter of the first stabilizing ring is larger than the inner cavity diameter of the fixed tube, and is adapted to the outer surface diameter of the connecting branch tube, and the inner cavity diameter of the connecting branch tube is adapted to the inner cavity diameter of the fixed tube.

[0009] In a preferred embodiment, one end of the connecting branch pipe extends to the interior of the first stabilizing ring and fits into the inner cavity wall of the first stabilizing ring, the diameter of the spiral blade is adapted to the inner cavity of the fixed tube and the connecting branch pipe, and the top end of the fixed rod and the spiral blade both extend into the interior of the connecting branch pipe.

[0010] In a preferred embodiment, a limiting ring groove is provided at the bottom of the connecting plate, the limiting ring groove is adapted to the porous frame, the cross-sectional shape of the porous frame is set to an "L"-shaped structure, the top of the porous frame extends to the inside of the limiting ring groove, and rivets are inserted around the bottom of the porous frame, the rivets penetrate the middle of the protective plate and are threadedly connected to the protective plate In a preferred embodiment, the automatic cleaning mechanism includes a plurality of scraper frames arranged between the porous frame and the filter cover, an annular groove is opened in the middle of the connecting plate, and a limiting tooth ring is fixedly provided on one end of the connecting branch pipe, the limiting tooth ring is adapted to the annular groove, and the limiting tooth ring is arranged in the middle of the annular groove.

[0011] In a preferred embodiment, the cross-sectional shape of the scraping frame is set to be a rectangle, and the three side walls of the scraping frame are respectively fitted with the outer surface of the filter cover, the inner cavity wall of the porous frame, and the bottom wall of the porous frame.

[0012] In a preferred embodiment, a second stabilizing ring is fixedly connected to the top of the scraper frame, the top of the second stabilizing ring is inserted in the middle of the connecting plate, the middle of the second stabilizing ring is fixedly connected to a gear ring, the gear ring is arranged in the middle of the connecting plate, and a transmission gear is arranged on one side of the gear ring.

[0013] In a preferred embodiment, the gear ring is meshed with a transmission gear, and the transmission gear is rotatably arranged in the middle of the connecting plate via a rotating shaft, and a side wall of the transmission gear is meshed with a limiting gear ring at the bottom end of the connecting branch pipe.

[0014] Technical effects and advantages of the present invention: 1. The present invention firstly enables the pumping pipe and the connecting plate to drop as the water level drops by setting a floating plate. When starting to pump water, the pumping end can be suspended in the water to avoid directly pumping out the bottom sediment, reduce the clogging time of the porous frame and the filter cover, and quickly pump out the liquid in the foundation pit. At the same time, during the pumping process, the automatic cleaning mechanism can enable the connecting plate to rotate at the bottom of the pumping pipe while the scraping frame scrapes the impurities on the surface of the porous frame and the filter cover, which can improve the filtering effect, avoid the clogging of the porous frame and the filter cover, improve the drainage effect, reduce the number of dredging times, thereby not affecting the project progress and improving the drainage efficiency; 2. The present invention also facilitates the connection of the connecting pipe and the water pump with the high-pressure water pump as required by the flange and the sealing gasket, and can select connecting pipes of different lengths and different numbers of water pumps for connection and use as required, thereby improving the water pumping efficiency. The floating plate and the water pump are conveniently connected by the provided clamp, and are convenient for assembly and use. The top of the porous frame is inserted into the interior of the limiting ring groove, and the protective plate is penetrated by rivets, so that the porous frame can be conveniently installed, fixed, disassembled and cleaned, and is convenient for use; 3. The present invention also provides a limit tooth ring at the bottom end of the connecting branch pipe located inside the annular groove, so that the connecting plate and the connecting branch pipe can be connected without affecting the rotation of the connecting plate. The water flows into the interior of the fixed pipe to impact the spiral blades, so that the fixed pipe drives the connecting plate to generate a rotation force. At the same time, the transmission gear rotates relative to the limit tooth ring at the bottom end of the connecting branch pipe and drives the tooth ring to rotate, so that the scraping frame scrapes the impurities between the porous frame and the filter cover, which can improve the filtering efficiency, reduce the clogging time, improve the pumping efficiency, and thus improve the use effect; In summary, through the mutual influence of the above-mentioned multiple effects, when pumping starts, the pumping end is suspended in the water to avoid directly pumping out the bottom mud and sand, thereby improving the pumping efficiency. At the same time, through the automatic cleaning mechanism that is set up, the connecting plate can drive the porous frame to rotate during pumping, and the scraper frame can scrape the walls of the porous frame and the filter cover, thereby improving the filtering effect while reducing the clogging time, thereby improving the drainage efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0016] Figure 2 It is a schematic diagram of the cross-sectional structure of the water pumping pipe and the porous frame of the present invention.

[0017] Figure 3 It is a schematic diagram of the cross-sectional split structure of the water pumping pipe, the connecting plate and the second stabilizing ring of the present invention.

[0018] Figure 4 It is a schematic diagram of the cross-sectional structure of the connecting plate of the present invention.

[0019] Figure 5It is a structural schematic diagram of the floating board of the present invention.

[0020] Figure 6 It is a schematic structural diagram of the water pumping pipe of the present invention.

[0021] Figure 7 It is a schematic diagram of the structure of the porous frame of the present invention.

[0022] Figure 8 It is a schematic diagram of the connection structure between the second stabilizing ring and the scraper frame of the present invention.

[0023] The accompanying drawings are marked as follows: 1. high-pressure water pump; 2. connecting pipe; 3. suction pipe; 4. floating plate; 5. clamp; 6. connecting branch pipe; 7. connecting plate; 8. first stabilizing ring; 9. annular groove; 10. fixing pipe; 11. support rod; 12. fixing rod; 13. spiral blade; 14. filter cover; 15. protective plate; 16. transmission gear; 17. second stabilizing ring; 18. scraper frame; 19. flange; 20. sealing gasket; 21. threaded hole; 22. limiting ring groove; 23. porous frame; 24. rivet; 25. gear ring; 26. third stabilizing ring. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] As attached Figure 1-8 The drainage device for foundation pit construction shown in the figure comprises a high-pressure water pump 1, the input end of the high-pressure water pump 1 is connected to a connecting pipe 2, one end of the connecting pipe 2 is connected to a water pumping pipe 3, the high-pressure water pump 1 is started to generate suction inside the water pumping pipe 3 through the connecting pipe 2, a floating plate 4 is arranged on the top of the water pumping pipe 3, the floating plate 4 can make the connecting plate 7 always be located underwater, and can move downward as the water level in the foundation pit drops, so as to avoid direct pumping from the bottom to cause soil flow and affect the filtering effect, the bottom of the water pumping pipe 3 is fixedly connected to a connecting branch pipe 6, the bottom of the water pumping pipe 3 is provided with a connecting plate 7, the top of the connecting plate 7 is fixedly connected to a first stabilizing ring 8, the connecting branch pipe 6 can generate suction at the bottom of the connecting plate 7, and the first stabilizing ring 8 can improve the stability of the connection between the connecting plate 7 and the connecting branch pipe 6; The bottom of the connecting plate 7 is fixedly connected with a fixed pipe 10 and a filter cover 14, the bottom of the inner cavity of the fixed pipe 10 is fixedly connected with a support rod 11, the top of the support rod 11 is fixedly connected with a fixed rod 12, the middle of the fixed rod 12 is fixedly sleeved with a spiral blade 13, the outside of the filter cover 14 is provided with a porous frame 23, and an automatic cleaning mechanism is provided between the porous frame 23 and the filter cover 14. The fixed rod 12 and the spiral blade 13 are supported and limited by the support rod 11, and the liquid passes through the bottom of the fixed pipe 10 through the fixed pipe 10 and enters the connecting branch pipe 6 When the middle part of the spiral blade 13 is reached, the spiral blade 13 can be impacted, so that the spiral blade 13 drives the fixed rod 12 to generate a rotational force, so that the fixed pipe 10 drives the connecting plate 7 to rotate at the bottom of the connecting branch pipe 6, so that the dust attached to the surface of the filter cover 14 can be separated by rotation, thereby improving the filtering effect, and the liquid entering the fixed pipe 10 can be secondary filtered through the porous frame 23 and the filter cover 14, thereby improving the filtering effect, and the space between the filter cover 14 and the porous frame 23 can be cleaned through the automatic cleaning mechanism, thereby improving the filtering effect.

[0026] As attached Figure 1 , 2 As shown, there are multiple pumping pipes 3, and flanges 19 are symmetrically fixedly connected at both ends of the pumping pipes 3. A sealing gasket 20 is arranged on one side of the flange 19. Multiple mounting holes are opened on the surface of the flange 19, and a fastening screw is inserted in the middle of the mounting hole. Liquids in multiple locations in the foundation pit of the construction site can be extracted and drained through the multiple pumping pipes 3, and the flange 19 and the sealing gasket 20 can be conveniently installed, connected and disassembled between the multiple pumping pipes 3 and the No. 2 connecting pipe 2 of the pumping pipe 3, thereby improving the use effect. The fastening screws are passed through the mounting holes for convenient installation, connection and use.

[0027] As attached Figure 1 , 2 As shown in Figure 5, the two ends of the bottom of the floating plate 4 are symmetrically fixedly connected with a clamp 5, the clamp 5 is sleeved on the middle part of the water pumping pipe 3, and a threaded hole 21 is opened at the bottom end of the clamp 5. A fastening screw is inserted in the middle of the threaded hole 21. The floating plate 4 can be conveniently installed on the top of the water pumping pipe 3 through the clamp 5. The clamp 5 can be fixed to the middle part of the water pumping pipe 3 by passing the fastening screw through the threaded hole 21 and squeezing the clamp 5, so as to facilitate the installation and fixation of the floating plate 4.

[0028] As attached Figure 2-4As shown, the inner cavity of the fixed tube 10 is connected with the inner cavity of the first stabilizing ring 8 through the middle part of the connecting plate 7. The inner cavity diameter of the first stabilizing ring 8 is larger than the inner cavity diameter of the fixed tube 10 and is adapted to the outer surface diameter of the connecting branch tube 6. The inner cavity diameter of the connecting branch tube 6 is adapted to the inner cavity diameter of the fixed tube 10. The connecting branch tube 6 is inserted into the interior of the first stabilizing ring 8 to connect the inner cavity of the connecting branch tube 6 with the inner cavity of the fixed tube 10. When suction is generated in the middle part of the connecting branch tube 6, suction is also generated inside the fixed tube 10 to facilitate the extraction and discharge of liquid.

[0029] As attached Figure 2 As shown, one end of the connecting branch pipe 6 extends to the interior of the first stabilizing ring 8 and fits with the inner cavity wall of the first stabilizing ring 8, the diameter of the spiral blade 13 is adapted to the inner cavity of the fixed pipe 10 and the connecting branch pipe 6, and the top of the fixing rod 12 and the spiral blade 13 both extend to the interior of the connecting branch pipe 6. By extending one end of the fixing rod 12 and the spiral blade 13 to the interior of the connecting branch pipe 6, the stability of the connection between the connecting branch pipe 6 and the first stabilizing ring 8 can be improved, thereby improving the rotation stability of the fixing rod 12 and the spiral blade 13, so that the liquid entering the interior of the connecting branch pipe 6 can impact the spiral blade 13, causing the spiral blade 13 to generate a rotational force.

[0030] As attached Figure 2 , 3 As shown in , 4 and 7, a limiting annular groove 22 is provided at the bottom of the connecting plate 7, and the limiting annular groove 22 is adapted to the porous frame 23. The cross-sectional shape of the porous frame 23 is set to an "L"-shaped structure. The top of the porous frame 23 extends to the inside of the limiting annular groove 22. Rivets 24 are inserted around the bottom of the porous frame 23. The rivet 24 passes through the middle of the protective plate 15 and is threadedly connected to the protective plate 15. The top of the porous frame 23 is inserted into the inside of the limiting annular groove 22, so that the top of the porous frame 23 can be limited and sealed, and the bottom end of the porous frame 23 is conveniently fixed by passing the protective plate 15 through the rivet 24, so that the installation position of the porous frame 23 can be fixed, and the liquid entering the interior is preliminarily filtered by the porous frame 23, and the liquid entering the middle of the fixed tube 10 is secondary filtered by the filter cover 14, so as to improve the filtering effect, facilitate the installation and disassembly of the porous frame 23, and improve the use effect. As attached Figure 2 , 3As shown in Figures 4, 6, and 8, the automatic cleaning mechanism includes a plurality of scraper frames 18 arranged between the porous frame 23 and the filter cover 14, an annular groove 9 is opened in the middle of the connecting plate 7, and a limiting tooth ring is fixedly sleeved on one end of the connecting branch pipe 6, and the limiting tooth ring is adapted to the annular groove 9. The limiting tooth ring is arranged in the middle of the annular groove 9. By rotating the scraper frame 18 between the filter cover 14 and the porous frame 23, impurities on the surfaces of the porous frame 23 and the filter cover 14 can be scraped to achieve the cleaning effect, thereby improving the filtering effect of the filter cover 14 and the porous frame 23, and the limiting tooth ring at one end of the connecting branch pipe 6 can be limited by the annular groove 9 to improve the stability of the connection between the connecting branch pipe 6 and the connecting plate 7.

[0031] As attached Figure 2 , 3 As shown in Figure 8, the cross-sectional shape of the scraper frame 18 is set to be a rectangle, and the three side walls of the scraper frame 18 are respectively fitted with the outer surface of the filter cover 14, the inner cavity wall of the porous frame 23 and the bottom wall of the porous frame 23. By scraping the walls of the filter cover 14 and the porous frame 23 by the scraper frame 18, the cleaning effect can be achieved, thereby improving the filtering effect of the porous frame 23 and the filter cover 14.

[0032] As attached Figure 2 , 3 As shown in Figure 8, the top of the scraper frame 18 is fixedly connected with the second stabilizing ring 17, the top of the second stabilizing ring 17 is inserted in the middle of the connecting plate 7, the middle of the second stabilizing ring 17 is fixedly connected with the gear ring 25, the gear ring 25 is arranged in the middle of the connecting plate 7, and a transmission gear 16 is arranged on one side of the gear ring 25. Through the cooperation of the second stabilizing ring 17 and the gear ring 25, the scraper frame 18 can be supported and limited. Through the rotation of the transmission gear 16, the gear ring 25 can be controlled to make the second stabilizing ring 17 drive the scraper frame 18 to rotate, which is convenient for driving the scraper frame 18 to rotate.

[0033] As attached Figure 2 , 3 As shown in Figure 8, the gear ring 25 is meshed with the transmission gear 16, and the transmission gear 16 is set in the middle of the connecting plate 7 through the rotation of the rotating shaft. One side wall of the transmission gear 16 is meshed with the limiting gear ring at the bottom end of the connecting branch pipe 6. When the connecting plate 7 rotates at the bottom of the water pumping pipe 3, the transmission gear 16 rotates around the connecting branch pipe 6 while rotating itself, thereby driving the second stabilizing ring 17 to rotate through the gear ring 25, so that the scraper frame 18 rotates between the filter cover 14 and the porous frame 23, which is convenient for scraping and cleaning impurities between the porous frame 23 and the filter cover 14, improving the filtering effect, so that the liquid enters the fixed pipe 10, and the connecting plate 7 rotates itself while controlling the scraper frame 18 to rotate between the filter cover 14 and the porous frame 23, thereby improving the filtering and water absorption effect, thereby improving the foundation pit drainage effect.

[0034] Working principle of the present invention: When in use, a connecting pipe 2 of a suitable length is selected according to the depth of the foundation pit, and a suitable number of pumping pipes 3 are selected according to the size of the foundation pit, so that the pumping pipes 3 are connected to each other, between the pumping pipes 3 and the connecting pipe 2, and between the connecting pipe 2 and the input end of the high-pressure water pump 1 through the flange 19 and the fastening screw; Then, the floating plate 4 is fixed to the top of the water pumping pipe 3 by means of the clamp 5 and the fastening screw, and the water pumping pipe 3 is placed in the water. The height of the water pumping pipe 3 is lowered by the floating plate 4 as the water level drops, until the bottom wall of the porous frame 23 contacts the bottom wall of the foundation pit; Start the high-pressure water pump 1 to generate suction inside the water pumping pipe 3 through the connecting pipe 2, thereby generating suction inside the fixed pipe 10 through the connecting branch pipe 6. The liquid in the foundation pit enters the middle part of the fixed pipe 10 through the filtration of the porous frame 23 and the filter cover 14, and enters the middle part of the water pumping pipe 3 through the connecting branch pipe 6. The liquid can be pumped out by the high-pressure water pump 1 to achieve the function of draining the foundation pit; When liquid enters the fixed tube 10, it will impact the spiral blades 13, so that the fixed rod 12 drives the fixed tube 10 to generate a rotational force. When the bottom of the porous frame 23 is suspended in the air, the connecting plate 7 will rotate at the bottom of the connecting branch pipe 6, and at the same time, the second stabilizing ring 17 will be driven to rotate through the transmission gear 16. The scraper frame 18 can be controlled to rotate between the porous frame 23 and the filter cover 14 to scrape the impurities on the surfaces of the porous frame 23 and the filter cover 14, thereby improving the filtering effect of the liquid entering the fixed tube 10, avoiding the inability to pump water due to blockage, and improving the use effect.

[0035] In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the case of no conflict, the same embodiment and different embodiments of the present invention can be combined with each other; Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A drainage device for foundation pit construction site, comprising a high-pressure water pump (1), characterized in that: The input end of the high-pressure water pump (1) is connected to a connecting pipe (2), one end of the connecting pipe (2) is connected to a water pumping pipe (3), a floating plate (4) is provided on the top of the water pumping pipe (3), a connecting branch pipe (6) is fixedly connected to the bottom of the water pumping pipe (3), a connecting plate (7) is provided on the bottom of the water pumping pipe (3), and a first stabilizing ring (8) is fixedly connected to the top of the connecting plate (7); The bottom of the connecting plate (7) is fixedly connected to a fixed tube (10) and a filter cover (14); the bottom of the inner cavity of the fixed tube (10) is fixedly connected to a support rod (11); the top of the support rod (11) is fixedly connected to a fixed rod (12); a spiral blade (13) is fixedly sleeved in the middle of the fixed rod (12); a porous frame (23) is arranged outside the filter cover (14); and an automatic cleaning mechanism is arranged between the porous frame (23) and the filter cover (14).

2. The drainage device for foundation pit construction site according to claim 1, characterized in that: The number of the water pumping pipes (3) is plural, and flanges (19) are symmetrically fixedly connected at both ends of the water pumping pipe (3), a sealing gasket (20) is arranged on one side of the flange (19), and a plurality of mounting holes are opened on the surface of the flange (19), and a fastening screw is inserted in the middle of the mounting hole.

3. The drainage device for foundation pit construction site according to claim 1, characterized in that: Hoops (5) are symmetrically fixedly connected to the two ends of the bottom of the floating plate (4); the hoop (5) is sleeved on the middle of the water pumping pipe (3); a threaded hole (21) is formed at the bottom end of the hoop (5); a fastening screw is inserted in the middle of the threaded hole (21).

4. The drainage device for foundation pit construction site according to claim 1, characterized in that: The inner cavity of the fixed tube (10) is connected to the inner cavity of the first stabilizing ring (8) through the middle of the connecting plate (7); the inner cavity diameter of the first stabilizing ring (8) is larger than the inner cavity diameter of the fixed tube (10) and matches the outer surface diameter of the connecting branch tube (6); the inner cavity diameter of the connecting branch tube (6) matches the inner cavity diameter of the fixed tube (10).

5. The drainage device for foundation pit construction site according to claim 1, characterized in that: One end of the connecting branch pipe (6) extends to the interior of the first stabilizing ring (8) and fits into the inner cavity wall of the first stabilizing ring (8); the diameter of the spiral blade (13) matches the inner cavity of the fixed pipe (10) and the connecting branch pipe (6); and the top ends of the fixed rod (12) and the spiral blade (13) both extend into the interior of the connecting branch pipe (6).

6. The drainage device for foundation pit construction site according to claim 1, characterized in that: A limiting annular groove (22) is provided at the bottom of the connecting plate (7), the limiting annular groove (22) being compatible with the porous frame (23), the cross-sectional shape of the porous frame (23) being arranged in an "L"-shaped structure, the top of the porous frame (23) extending to the inside of the limiting annular groove (22), rivets (24) being inserted around the bottom of the porous frame (23), the rivets (24) penetrating the middle of the protective plate (15) and being threadedly connected to the protective plate (15).

7. The drainage device for foundation pit construction site according to claim 1, characterized in that: The automatic cleaning mechanism comprises a plurality of scraper frames (18) arranged between the porous frame (23) and the filter cover (14); an annular groove (9) is provided in the middle of the connecting plate (7); a limiting toothed ring is fixedly sleeved on one end of the connecting branch pipe (6); the limiting toothed ring is adapted to the annular groove (9) and is arranged in the middle of the annular groove (9).

8. The drainage device for foundation pit construction site according to claim 7, characterized in that: The cross-sectional shape of the scraping frame (18) is set to be a rectangle, and the three side walls of the scraping frame (18) are respectively fitted with the outer surface of the filter cover (14), the inner cavity wall of the porous frame (23), and the bottom wall of the porous frame (23).

9. The drainage device for foundation pit construction site according to claim 8, characterized in that: The top of the scraper frame (18) is fixedly connected to a second stabilizing ring (17), the top of the second stabilizing ring (17) is inserted into the middle of the connecting plate (7), the middle of the second stabilizing ring (17) is fixedly connected to a gear ring (25), the gear ring (25) is arranged in the middle of the connecting plate (7), and a transmission gear (16) is arranged on one side of the gear ring (25).

10. The drainage device for foundation pit construction site according to claim 9, characterized in that: The gear ring (25) is meshed with the transmission gear (16), and the transmission gear (16) is rotatably arranged in the middle of the connecting plate (7) via a rotating shaft, and a side wall of the transmission gear (16) is meshed with the limiting gear ring at the bottom end of the connecting branch pipe (6).

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