A foundation pit drainage filtering device for building construction

Abstract

The application relates to the technical field of foundation pit drainage, and discloses a foundation pit drainage filtering device for building construction, which comprises a foundation pit and a water pump, the water pump is arranged on the outer side of the foundation pit, the water inlet end of a drainage pipe is fixedly connected with the drainage pipe, and the device further comprises a supporting plate arranged in the foundation pit, the inner wall of the supporting plate is fixedly connected with the outer surface of the drainage pipe; the filtering mechanism, the anti-blocking mechanism and the self-adaptive adjusting mechanism are arranged, the anti-blocking mechanism drives the filtering mechanism to rotate through gear transmission, the silt adsorbed on the surface of the filtering mechanism is thrown away under the action of centrifugal force, the filtering holes are effectively prevented from being blocked by silt accumulation, meanwhile, the anti-blocking mechanism synchronously drives the pulse mechanism to perform piston movement during operation, compressed gas is intermittently sprayed to the filtering mechanism, the fine silt particles embedded in the filtering holes are blown out in the reverse direction through the gas impact force, the double anti-blocking mechanism of 'centrifugal throwing + gas backflushing' is realized, and the drainage efficiency is effectively prevented from being affected by blockage.

Description

Technical Field

[0001] This invention relates to the field of foundation pit drainage technology, specifically to a foundation pit drainage and filtration device used in building construction. Background Technology

[0002] An excavation pit is a pit dug at the foundation design location according to the base elevation and foundation plan dimensions. It is a basic temporary structure in building construction. During the rainy season, when rainfall is excessive or groundwater seepage is significant, water can easily accumulate in the excavation pit. If it is not drained in time, it will not only affect the construction progress but may also erode the foundation, causing significant damage to the building quality.

[0003] Currently, foundation pit drainage typically employs a water pump in conjunction with drainage pipes to pump accumulated water outwards. To prevent impurities such as silt and construction waste from entering the drainage pipes and causing blockages, the conventional practice is to install a filter device at the suction end of the drainage pipe. However, during long-term use, silt and other impurities gradually adhere to and accumulate on the surface of the filter element, causing blockage of the filter holes and a continuous decrease in drainage efficiency. As impurities accumulate on the surface of the filter element, the pumping resistance increases, and drainage efficiency gradually decreases, sometimes even leading to drainage interruption.

[0004] To address this issue, we propose a foundation pit drainage and filtration device for building construction. Summary of the Invention

[0005] The purpose of this invention is to provide a foundation pit drainage and filtration device for building construction, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a foundation pit drainage and filtration device for building construction, comprising a foundation pit and a water pump, wherein the water pump is disposed outside the foundation pit, and the inlet end of the drainage pipe is fixedly connected to a drainage pipe, and further comprising: A support plate is installed inside the foundation pit. The inner wall of the support plate is fixedly connected to the outer surface of the drainage pipe. Four sleeves are fixedly connected to the bottom of the support plate. Telescopic support legs are slidably connected inside the sleeves. A filter mechanism is installed at the bottom of the support plate. An anti-clogging mechanism is fixedly mounted on a support plate, and the anti-clogging mechanism can rotate the filter mechanism via gear transmission. A pulse mechanism is fixedly mounted on a support plate. The pulse mechanism performs piston movement through the anti-clogging mechanism, intermittently spraying compressed gas onto the filter mechanism. An adaptive adjustment mechanism is movably mounted on a support plate, and the adaptive adjustment mechanism can adjust the position of the gas ejected by the pulse mechanism through the water level.

[0007] Preferably, the filtration mechanism includes a filter cylinder disposed at the bottom of the support plate, the surface of the filter cylinder having filter holes, one end of the drain pipe penetrating into the interior of the filter cylinder, a bearing being disposed at the bottom of the filter cylinder, and a connecting plate being rotatably connected to the bearing, a support rod being disposed at the connection point between the connecting plate and the sleeve, and being fixedly connected by the support rod.

[0008] Preferably, the anti-blocking mechanism includes a motor fixedly installed on the top of the support plate, the output end of the motor extending through to the bottom of the support plate and fixedly connected to a transmission gear, and a gear ring that cooperates with the transmission gear being fixedly connected to the outer surface of the sleeve.

[0009] Preferably, the pulse mechanism includes an air collection box fixedly connected to the bottom of the support plate, an air inlet pipe fixedly connected to the top of the air collection box, the top of the air inlet pipe extending through to the top of the support plate, and a transmission hose fixedly connected to one side of the air collection box. The gas collection box is equipped with a piston plate inside. A piston rod is fixedly connected to one side of the piston plate. One end of the piston rod extends through to one side of the gas collection box and is fixedly connected to a pressing block. A cam that cooperates with the pressing block is fixedly connected to the surface of the motor output end. A tension spring is fixedly connected to one side of the piston plate, and one end of the tension spring is fixedly connected to the inner wall of the gas collection box.

[0010] Preferably, the adaptive adjustment mechanism includes a buoyancy block located at the bottom of the support plate, a compression box fixedly connected to the bottom of the buoyancy block, a plurality of jet pipes fixedly connected to one side of the compression box through a one-way pressure valve, one end of the transmission hose fixedly connected to one side of the compression box, two guide rods fixedly connected to the bottom of the support plate, and a guide hole for cooperating with the guide rods being opened at the bottom of the buoyancy block.

[0011] Preferably, the buoyancy block is made of high-density closed-cell foam plastic.

[0012] Preferably, a first one-way valve is fixedly installed on the surface of the air intake pipe, and a second one-way valve is fixedly installed on the surface of the transmission hose.

[0013] Preferably, a rotating roller is fixedly connected to the bottom of the transmission gear, and a plurality of cleaning brushes are fixedly connected to the surface of the rotating roller.

[0014] Preferably, the filter holes are conical and there are several of them.

[0015] Preferably, one side of the sleeve is provided with a hand-tightening screw for fixing the telescopic outrigger, and one side of the sleeve is provided with a threaded hole for use with the hand-tightening screw.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention features a filtration mechanism in which filter holes are provided on the surface of the filter cylinder, and one end of a drain pipe extends into the interior of the filter cylinder. This allows accumulated water to enter the filter cylinder through the filter holes and then be discharged through the drain pipe, effectively trapping sediment outside the filter cylinder. Meanwhile, the bottom of the filter cylinder is rotatably connected to a support plate via a bearing, ensuring smooth rotation of the filter cylinder under the drive of the anti-clogging mechanism, reducing rotational friction resistance, and lowering motor power consumption.

[0017] This invention incorporates an anti-clogging mechanism. By starting a motor, the transmission gear is driven to rotate. Under the drive of the transmission gear, the gear ring and filter cylinder also rotate around the bearing. The centrifugal force generated by the rotation throws out impurities such as mud and sand, thus preventing clogging and ensuring drainage efficiency.

[0018] This invention employs a pulse mechanism. As the motor rotates, it drives a cam to rotate as well. When the cam's protruding end contacts the compression block, the compression block moves to the left, simultaneously moving the piston rod and piston plate to the left. When the cam rotates to a point where it no longer contacts the compression block, the tension spring causes the piston plate to move to the right. At this point, the gas collection box is under negative pressure, allowing gas to enter through the inlet pipe. As the piston plate moves to the left, it compresses the gas in the collection box, sending it through the transmission hose into the compression box. This cycle repeats until the gas pressure in the compression box reaches the one-way pressure valve, at which point it is ejected from the jet pipe. The compressed gas impacts the filter cartridge, causing vibration and dislodging sediment, further improving the anti-clogging effect.

[0019] This invention features an adaptive adjustment mechanism that allows the height of the jet pipe to automatically rise and fall with changes in the water level within the pit. When the water level drops, the buoyancy block moves the compression box and jet pipe downwards synchronously; when the water level rises, they move upwards synchronously. This ensures that the jet pipe always sprays air into the area of ​​the filter mechanism below the water surface where the blockage is most severe. The cooperation between the guide rod and the guide hole ensures a smooth and unbiased lifting process. The one-way pressure valve ensures that the compressed gas can only be ejected after reaching the set pressure, guaranteeing sufficient jet impact force. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the main structure of the present invention; Figure 2 This is a perspective view of a partial structure in this invention; Figure 3 This is a perspective view of the filter cartridge in this invention. Figure 4 For the present invention Figure 3 A magnified view of a section at point A in the middle; Figure 5 This is a perspective view of a partial structure of the pulse mechanism in this invention; Figure 6 This is a perspective view of the anti-blocking mechanism and the pulse mechanism in this invention; Figure 7 This is a perspective view of the anti-blocking mechanism in this invention; Figure 8 This is a perspective view of the buoyancy block in this invention; Figure 9 This is a perspective view of the sleeve in this invention.

[0021] In the diagram: 1. Foundation pit; 2. Water pump; 3. Drainage pipe; 4. Support plate; 5. Sleeve; 6. Telescopic outrigger; 7. Filter cylinder; 8. Filter hole; 9. Bearing; 10. Connecting plate; 11. Support rod; 12. Motor; 13. Transmission gear; 14. Gear ring; 15. Air collection box; 16. Air inlet pipe; 17. Transmission hose; 18. Piston plate; 19. Piston rod; 20. Extrusion block; 21. Cam; 22. Tension spring; 23. Buoyancy block; 24. Compression box; 25. Jet pipe; 26. Guide rod; 27. Guide hole; 28. Rotating roller; 29. ​​Cleaning brush; 30. Hand screw; 31. Threaded hole. Detailed Implementation

[0022] 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 embodiments of the present invention, and not all embodiments. Based on the 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.

[0023] Please see Figures 1-9 As shown, Example 1: A foundation pit drainage and filtration device for building construction includes a foundation pit 1 and a water pump 2, the water pump 2 being located outside the foundation pit 1, and a drainage pipe 3 having its inlet end fixedly connected to it. The device also includes: The support plate 4 is installed inside the foundation pit 1. The inner wall of the support plate 4 is fixedly connected to the outer surface of the drainage pipe 3. Four sleeves 5 are fixedly connected to the bottom of the support plate 4. Telescopic support legs 6 are slidably connected inside the sleeves 5. A filter mechanism is installed at the bottom of the support plate 4. The anti-clogging mechanism is fixedly mounted on the support plate 4. The anti-clogging mechanism can rotate the filter mechanism through gear transmission. The pulse mechanism is fixedly mounted on the support plate 4. The pulse mechanism performs piston movement through the anti-blocking mechanism, intermittently spraying compressed gas onto the filter mechanism. An adaptive adjustment mechanism is movably mounted on the support plate 4. The adaptive adjustment mechanism can adjust the position of the gas ejected by the pulse mechanism through water level adjustment.

[0024] In this embodiment, a filtration mechanism, an anti-clogging mechanism, and an adaptive adjustment mechanism are set up. The anti-clogging mechanism uses gear transmission to drive the filtration mechanism to rotate, so that the mud and sand adsorbed on the surface of the filtration mechanism are thrown off under the action of centrifugal force, effectively preventing the accumulation of mud and sand from clogging the filter holes 8. At the same time, during the operation of the anti-clogging mechanism, the pulse mechanism is synchronously driven to perform piston movement, generating compressed gas that is intermittently sprayed onto the filtration mechanism. The gas impact force blows out the fine mud and sand embedded in the filter holes 8 in the opposite direction, realizing a dual anti-clogging mechanism of "centrifugal throwing off + pneumatic backflushing", effectively preventing clogging from affecting drainage efficiency.

[0025] The filtration mechanism includes a filter cylinder 7 located at the bottom of the support plate 4. The surface of the filter cylinder 7 is provided with filter holes 8. One end of the drain pipe 3 passes through the interior of the filter cylinder 7. A bearing 9 is provided at the bottom of the filter cylinder 7, and a connecting plate 10 is rotatably connected to it through the bearing 9. A support rod 11 is provided at the connection between the connecting plate 10 and the sleeve 5, and the connection is fixed through the support rod 11.

[0026] In this embodiment, a filtration mechanism is provided, wherein the surface of the filter cylinder 7 is provided with filter holes 8, and one end of the drain pipe 3 extends into the interior of the filter cylinder 7, so that the accumulated water enters the filter cylinder 7 through the filter holes 8 and is discharged through the drain pipe 3. The mud and sand are effectively intercepted outside the filter cylinder 7. At the same time, the bottom of the filter cylinder 7 is rotatably connected to the support plate 4 through the bearing 9, ensuring that the filter cylinder 7 rotates smoothly under the drive of the anti-clogging mechanism, reducing rotational friction resistance and reducing the power consumption of the motor 12.

[0027] The anti-blocking mechanism includes a motor 12 fixedly installed on the top of the support plate 4. The output end of the motor 12 extends through to the bottom of the support plate 4 and is fixedly connected to a transmission gear 13. A gear ring 14 that cooperates with the transmission gear 13 is fixedly connected to the outer surface of the sleeve 5.

[0028] In this embodiment, by setting an anti-clogging mechanism, the transmission gear 13 can be driven to rotate by starting the motor 12. Under the drive of the transmission gear 13, the gear ring 14 and the filter cylinder 7 will also rotate around the bearing 9. The centrifugal force generated by the rotation will throw out impurities such as mud and sand, thus avoiding clogging and affecting the drainage efficiency.

[0029] A rotating roller 28 is fixedly connected to the bottom of the transmission gear 13, and several cleaning brushes 29 are fixedly connected to the surface of the rotating roller 28.

[0030] In this embodiment, by setting a rotating roller 28 and a cleaning brush 29, the cleaning brush 29 rotates synchronously with the transmission gear 13 during the rotation of the filter cylinder 7, and physically brushes the outer surface of the filter cylinder 7, thereby further improving the anti-clogging effect.

[0031] The filter holes 8 are conical in shape and there are several of them.

[0032] In this embodiment, the filter holes 8 are conical in shape and there are several of them. The larger opening of the conical hole faces the outside of the filter cylinder 7 and the smaller opening faces the inside of the filter cylinder 7. This makes it easier for impurities such as mud and sand to be squeezed as the hole diameter gradually decreases when they enter the conical hole with the water flow, so that they are less likely to form stable blockages in the hole.

[0033] A hand-tightening screw 30 for fixing the telescopic outrigger 6 is provided on one side of the sleeve 5, and a threaded hole 31 for cooperating with the hand-tightening screw 30 is provided on one side of the sleeve 5.

[0034] In this embodiment, by setting threaded holes 31 and hand-tightening screws 30, the length of the telescopic support leg 6 extending out of the sleeve 5 can be quickly adjusted and locked. When there are unevenness or local protrusions at the bottom of the pit 1, the level of the support plate 4 can be adjusted by adjusting the length of each telescopic support leg 6 to ensure the smooth operation of the filtration mechanism and avoid rotation jamming or uneven filtration due to tilting.

[0035] Example 2: The pulse mechanism includes an air collection box 15 fixedly connected to the bottom of the support plate 4. An air inlet pipe 16 is fixedly connected to the top of the air collection box 15. The top of the air inlet pipe 16 extends through to the top of the support plate 4. A transmission hose 17 is fixedly connected to one side of the air collection box 15. The gas collection box 15 is equipped with a piston plate 18. A piston rod 19 is fixedly connected to one side of the piston plate 18. One end of the piston rod 19 extends through to one side of the gas collection box 15 and is fixedly connected to a compression block 20. A cam 21 that works with the compression block 20 is fixedly connected to the surface of the output end of the motor 12. A tension spring 22 is fixedly connected to one side of the piston plate 18. One end of the tension spring 22 is fixedly connected to the inner wall of the gas collection box 15.

[0036] In this embodiment, a pulse mechanism is set up so that when the motor 12 rotates, the cam 21 will rotate. When the protruding end of the cam 21 contacts the extrusion block 20, the extrusion block 20 will move to the left due to the extrusion, which will drive the piston rod 19 and the piston plate 18 to move to the left. When the cam 21 rotates to the point where it no longer contacts the extrusion block 20, the tension generated by the tension spring 22 will drive the piston plate 18 to move to the right. At this time, the gas collection box 15 is under negative pressure, and the gas will enter the gas collection box 15 through the air inlet pipe 16. When the piston plate 18 moves to the left, it will compress the gas in the gas collection box 15 and make it enter the compression box 24 through the transmission hose 17. This cycle continues. When the gas pressure in the compression box 24 reaches the one-way pressure valve, it will be sprayed out from the jet pipe 25. The compressed gas will hit the filter cylinder 7 and vibrate, shaking off the mud and sand, further improving the anti-clogging effect.

[0037] A first one-way valve is fixedly installed on the surface of the intake pipe 16, and a second one-way valve is fixedly installed on the surface of the transmission hose 17.

[0038] In this embodiment, by setting a first one-way valve, it is ensured that external air enters the gas collection box 15 in one direction when the piston plate 18 is reset, thus preventing the backflow of residual gas in the gas collection box 15. By setting a second one-way valve on the surface of the transmission hose 17, it is ensured that the compressed gas flows to the compression box 24 in one direction, thus preventing the compressed gas from being sucked back when the piston plate 18 is reset, and ensuring the stability and reliability of pulse jet.

[0039] Example 3: The adaptive adjustment mechanism includes a buoyancy block 23 located at the bottom of the support plate 4. A compression box 24 is fixedly connected to the bottom of the buoyancy block 23. Several jet pipes 25 are fixedly connected to one side of the compression box 24 through a one-way pressure valve. One end of the transmission hose 17 is fixedly connected to one side of the compression box 24. Two guide rods 26 are fixedly connected to the bottom of the support plate 4. A guide hole 27 that cooperates with the guide rods 26 is opened at the bottom of the buoyancy block 23.

[0040] In this embodiment, an adaptive adjustment mechanism is set up so that the height of the jet pipe 25 can automatically rise and fall with the water level in the pit 1. When the water level drops, the buoyancy block 23 drives the compression box 24 and the jet pipe 25 to move down synchronously. When the water level rises, they move up synchronously, ensuring that the jet pipe 25 always sprays air into the area of ​​the filter mechanism below the water surface where the blockage is most severe. The cooperation between the guide rod 26 and the guide hole 27 ensures that the lifting process is stable and does not deviate. The one-way pressure valve ensures that the compressed gas can be sprayed out only after reaching the set pressure, ensuring that the jet impact force is sufficient.

[0041] Buoyancy block 23 is made of high-density closed-cell foam plastic.

[0042] In this embodiment, the buoyancy block 23 is made of high-density closed-cell foam plastic. The closed-cell structure effectively prevents water from seeping in. Even when immersed in the water in the pit 1 for a long time, it can still maintain good buoyancy performance and will not fail due to increased weight from water absorption. In addition, the material is corrosion resistant and has a long service life.

[0043] The working principle and usage process of this invention: When draining water, the water pump 2 is started, and then the accumulated water enters the filter cylinder 7 through the filter hole 8 and is discharged through the drain pipe 3. The mud and sand are effectively intercepted outside the filter cylinder 7. At the same time, the motor 12 is started to drive the transmission gear 13 to rotate. Under the drive of the transmission gear 13, the gear ring 14 and the filter cylinder 7 will also rotate around the bearing 9. The centrifugal force generated by the rotation will throw out mud, sand and other impurities, avoiding blockage and affecting the drainage efficiency. As the motor 12 rotates, it drives the cam 21 to rotate as well. When the protruding end of the cam 21 contacts the extrusion block 20, the extrusion block 20 moves to the left due to the extrusion, which in turn drives the piston rod 19 and the piston plate 18 to move to the left. When the cam 21 rotates to the point where it no longer contacts the extrusion block 20, the tension generated by the tension spring 22 drives the piston plate 18 to move to the right. At this time, the air collection box 15 is under negative pressure, and the gas enters the air collection box 15 through the air inlet pipe 16. When the piston plate 18 moves to the left, it compresses the gas in the air collection box 15, which then enters the compression box 24 through the transmission hose 17. This cycle continues until the gas pressure in the compression box 24 reaches the one-way pressure valve, at which point it is ejected from the jet pipe 25. The compressed gas impacts the filter cartridge 7, causing vibration and dislodging the mud and sand, further improving the anti-clogging effect.

[0044] The structure used in this application can be additionally fitted with protective measures that are common knowledge in the field of this technology under different usage environments, including but not limited to the following methods, such as protective covers for equipment protection, dustproof nets for equipment dust prevention, and sealing components or waterproof coatings for equipment waterproofing, which are commonly used by those skilled in the art.

[0045] It should be noted that (water pump 2 and motor 12) are existing devices or equipment, or devices or equipment that can be implemented by existing technology. The power supply, connection method, usage method, power source, fixing method, installation method, control method, etc. of the equipment, as well as the materials of each accessory and the selection of various parameters are common knowledge to those skilled in the art, and therefore will not be described in detail in this application document.

[0046] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0047] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A foundation pit drainage and filtration device for building construction, comprising a foundation pit (1) and a water pump (2), wherein the water pump (2) is disposed outside the foundation pit (1), and the inlet end of the drainage pipe (3) is fixedly connected to the drainage pipe (3), characterized in that, Also includes: A support plate (4) is installed inside the foundation pit (1). The inner wall of the support plate (4) is fixedly connected to the outer surface of the drainage pipe (3). Four sleeves (5) are fixedly connected to the bottom of the support plate (4). Telescopic support legs (6) are slidably connected inside the sleeves (5). A filter mechanism is installed at the bottom of the support plate (4). Anti-clogging mechanism, the anti-clogging mechanism is fixedly mounted on the support plate (4), the anti-clogging mechanism can make the filter mechanism rotate through gear transmission; The pulse mechanism is fixedly mounted on the support plate (4). The pulse mechanism performs piston movement through the anti-blocking mechanism and intermittently sprays compressed gas onto the filter mechanism. An adaptive adjustment mechanism is movably mounted on a support plate (4). The adaptive adjustment mechanism can adjust the position of the gas ejected by the pulse mechanism by adjusting the water level.

2. The foundation pit drainage and filtration device for building construction according to claim 1, characterized in that: The filtration mechanism includes a filter cylinder (7) located at the bottom of the support plate (4). The surface of the filter cylinder (7) is provided with filter holes (8). One end of the drain pipe (3) extends into the interior of the filter cylinder (7). A bearing (9) is provided at the bottom of the filter cylinder (7), and a connecting plate (10) is rotatably connected to it via the bearing (9). A support rod (11) is provided at the connection between the connecting plate (10) and the sleeve (5), and the connection is fixedly made via the support rod (11).

3. A foundation pit drainage and filtration device for building construction according to claim 2, characterized in that: The anti-blocking mechanism includes a motor (12) fixedly installed on the top of the support plate (4). The output end of the motor (12) extends through to the bottom of the support plate (4) and is fixedly connected to a transmission gear (13). The outer surface of the sleeve (5) is fixedly connected to a gear ring (14) that cooperates with the transmission gear (13).

4. A foundation pit drainage and filtration device for building construction according to claim 3, characterized in that: The pulse mechanism includes an air collection box (15) fixedly connected to the bottom of the support plate (4), an air inlet pipe (16) fixedly connected to the top of the air collection box (15), the top of the air inlet pipe (16) extending through to the top of the support plate (4), and a transmission hose (17) fixedly connected to one side of the air collection box (15). The gas collection box (15) is equipped with a piston plate (18). A piston rod (19) is fixedly connected to one side of the piston plate (18). One end of the piston rod (19) extends through to one side of the gas collection box (15) and is fixedly connected to a compression block (20). A cam (21) that works with the compression block (20) is fixedly connected to the surface of the output end of the motor (12). A tension spring (22) is fixedly connected to one side of the piston plate (18). One end of the tension spring (22) is fixedly connected to the inner wall of the gas collection box (15).

5. A foundation pit drainage and filtration device for building construction according to claim 4, characterized in that: The adaptive adjustment mechanism includes a buoyancy block (23) located at the bottom of the support plate (4). A compression box (24) is fixedly connected to the bottom of the buoyancy block (23). A number of jet pipes (25) are fixedly connected to one side of the compression box (24) through a one-way pressure valve. One end of the transmission hose (17) is fixedly connected to one side of the compression box (24). Two guide rods (26) are fixedly connected to the bottom of the support plate (4). A guide hole (27) is opened at the bottom of the buoyancy block (23) to cooperate with the guide rods (26).

6. A foundation pit drainage and filtration device for building construction according to claim 5, characterized in that: The buoyancy block (23) is made of high-density closed-cell foam plastic.

7. A foundation pit drainage and filtration device for building construction according to claim 4, characterized in that: A first one-way valve is fixedly installed on the surface of the air intake pipe (16), and a second one-way valve is fixedly installed on the surface of the transmission hose (17).

8. A foundation pit drainage and filtration device for building construction according to claim 3, characterized in that: A rotating roller (28) is fixedly connected to the bottom of the transmission gear (13), and a number of cleaning brushes (29) are fixedly connected to the surface of the rotating roller (28).

9. A foundation pit drainage and filtration device for building construction according to claim 2, characterized in that: The filter holes (8) are conical in shape and there are several of them.

10. A foundation pit drainage and filtration device for building construction according to any one of claims 1-9, characterized in that: The sleeve (5) has a hand screw (30) for fixing the telescopic outrigger (6) on one side, and a threaded hole (31) for cooperating with the hand screw (30) is provided on one side of the sleeve (5).

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