Foundation pit drainage device for water conservancy and hydropower construction and using method of foundation pit drainage device

Abstract

The invention relates to a foundation pit drainage device for water conservancy and hydropower construction and a using method thereof, and belongs to the technical field of water conservancy construction equipment. Comprising a foundation pit body, a pump body arranged at the top of the foundation pit body, a water pumping pipe connected to the water inlet end of the pump body, a water collecting well formed in the foundation pit body and an interception piece arranged at an opening of the water collecting well. The bottom of the mounting shell is open, the mounting shell covers the opening of the water collecting well, the filtering pieces are arranged on the periphery of the mounting shell, inserting grooves are formed in the side walls of the periphery of the mounting shell, the filtering pieces comprise filtering shells inserted into the inserting grooves in a sliding mode, the filtering shells are in a shell shape, and the ends, facing the interior of the mounting shell, of the filtering shells are open; a driving mechanism for driving the filtering shell to slide is arranged on the mounting shell, a plurality of first filtering holes are uniformly distributed in the filtering shell, and the water pumping pipe penetrates through the top of the mounting shell and extends into the water collecting well. By means of the device, the problem that in the prior art, workers need to go down a foundation pit to clean silt is solved.

Description

Technical Field

[0001] The invention relates to a foundation pit drainage device for water conservancy and hydropower construction and a use method thereof, belonging to the technical field of water conservancy construction equipment. 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. Excessive precipitation in the rainy season or large groundwater seepage can easily lead to water accumulation in the foundation pit. If the accumulated water is not discharged in time, it will not only affect the construction period, but also erode the foundation, causing serious harm to the quality of the building. Drainage ditches are excavated around the bottom of the foundation pit, and some drainage ditches are equipped with water collection wells. The accumulated water in the foundation pit flows into the water collection well after passing through the drainage ditch. At present, when draining the foundation pit, the pumping pipe is usually placed in the water collection well of the foundation pit, and the accumulated water is pumped out by a water pump. Due to the presence of impurities such as mud and construction waste in the foundation pit, the impurities flow into the water collection well together with the accumulated water. The pumping pipe is prone to blockage during pumping, resulting in interruption of pumping, affecting the drainage efficiency.

[0003] In response to the above technical problems, a Chinese utility model patent with announcement number CN211228564U discloses a dam foundation pit drainage device, the technical key points of which are: it includes a water pump located above the foundation pit, the water pump is provided with a water pumping pipe extending into the foundation pit, and also includes a sump opened at the bottom of the foundation pit, the sump is provided with a filter box partially extending out of the sump, filter grooves are respectively provided on the four side walls of the filter box, the bottom surface of the filter groove is located below the bottom surface of the foundation pit, a filter mesh cloth for closing the filter groove is provided at the filter groove, and the water pumping pipe is located in the filter box.

[0004] The above scheme adopts setting a filter cloth at the opening of the sump to prevent impurities from entering the sump. However, when there is a lot of water in the foundation pit, it is impossible to drain the accumulated water into the sump in time to reduce the water level of the foundation pit.

[0005] After searching, a Chinese patent with announcement number CN118166808B discloses a foundation pit drainage device and drainage method, and its technical key points are: it includes a shell, a first intercepting piece, a second intercepting piece, a collecting chamber and a water pump unit, the shell is arranged at the opening of the water collection pit, and the top of the shell is provided with a top plate; the first intercepting piece is arranged on the outer periphery of the top of the shell to intercept large particles of impurities; the second intercepting piece is arranged in the shell to intercept small particles of impurities; the collecting chamber is arranged on the outside of the shell and is connected to the shell, and is used to collect small particles of impurities intercepted by the second intercepting piece; the water pump unit is arranged outside the foundation pit and is equipped with a plurality of water pumps, each of which is equipped with a first pumping pipe and a second pumping pipe, the water suction end of the first pumping pipe is located in the area enclosed by the first intercepting piece, and the water suction end of the second pumping pipe passes through the second intercepting piece and extends into the interior of the water collection pit.

[0006] The above scheme adopts the arrangement of a first intercepting member and a second intercepting member at the opening of the sump to reduce the problem of silt entering the sump. However, since the silt will still accumulate outside the first intercepting member, the drainage efficiency of the sump will become lower and lower. In addition, due to the high content of sewage and silt in the foundation pit, it is unrealistic to control when the second intercepting member is flipped to discharge silt and sand by driving the electric cylinder. The silt is then collected through a collecting chamber, which is very easy to be filled up so that all the silt is accumulated in the shell. It is inconvenient for the staff to go down to the foundation pit to clean the collecting chamber, and it is difficult to continue to drain the foundation pit.

[0007] Therefore, a new solution needs to be proposed to solve this problem. Summary of the invention

[0008] The technical problem to be solved by the present invention is to provide a foundation pit drainage device for water conservancy and hydropower construction and a use method thereof, which solves the problem in the prior art that workers are required to go down to the foundation pit to clean up mud and sand.

[0009] The technical problem to be solved by the present invention is achieved by adopting the following technical solutions: A foundation pit drainage device for water conservancy and hydropower construction, comprising a foundation pit body, a pump body arranged on the top of the foundation pit body, a water pumping pipe connected to the water inlet end of the pump body, a water collection well opened in the foundation pit body, and a retaining member arranged at the opening of the water collection well; The intercepting member includes a mounting shell with an open bottom and covering the opening of the water collection well, and filter members respectively arranged around the mounting shell, and slots are provided on the side walls around the mounting shell. The filter member includes a filter shell slidably inserted into the slots, and the filter shell is in a shell shape and has an open end facing the interior of the mounting shell. The mounting shell is provided with a driving mechanism for driving the filter shell to slide, and a plurality of first filter holes are evenly distributed on the filter shell. The water suction pipe passes through the top of the mounting shell and extends into the water collection well.

[0010] The present invention is further configured as follows: the driving mechanism includes a fixed sleeve fixedly connected to the inner top surface of the mounting shell, a driving shaft rotatably connected to the fixed sleeve, a driving member connected to the driving shaft, a driving disk fixedly connected to the bottom end of the driving shaft and located below the fixed sleeve, and a plurality of connecting members respectively connected between the driving disk and the filter shell, the connecting member includes a connecting rod, one end of the connecting rod is hinged to the filter shell and the other end is hinged to the driving disk.

[0011] The present invention is further configured as follows: a tee is provided on the water pumping pipe, one end of the tee is connected to an air pipe, and the air pipe and the bottom end of the water pumping pipe are connected to a switching valve for closing the air pipe while opening the water pumping pipe, or opening the air pipe while closing the water pumping pipe; The driving member includes an expansion shell connected to the side wall of the fixed sleeve, a first bevel gear coaxially fixedly connected to the driving shaft, a second bevel gear rotatably connected to the expansion shell and meshing with the first bevel gear, an impeller connected to one end of the second bevel gear, and a reset torsion spring arranged between the fixed sleeve and the driving shaft, and the air pipe is connected to one side of the expansion shell and the airflow direction of the air pipe is along the tangential direction of the outer edge of the impeller.

[0012] The present invention is further configured as follows: the switching valve includes a valve body, a valve cavity opened in the valve body and extending in a vertical direction, and a floating block slidably connected to the valve cavity; an air inlet and an exhaust port are opened at the top of the valve body, a water inlet and a drain port are opened at the bottom of the valve body, the exhaust port and the drain port are respectively connected to the air pipe and the water pump pipe; when the floating block is located at the top of the valve cavity, the air inlet and the exhaust port are closed; when the floating block is located at the bottom of the valve cavity, the water inlet and the drain port are closed.

[0013] The present invention is further configured as follows: the filter shell is a telescopic shell, the filter shell includes a first filter cartridge, a second filter cartridge slidably inserted in the first filter cartridge, and a filter plate fixedly connected to an end of the second filter cartridge away from the mounting shell, the first filter cartridge having an end located in the mounting shell and fixedly connected to a positioning ring, the first filter cartridge having an inner wall provided with a slide groove extending along its length direction, the outer wall of the second filter cartridge having an end close to the mounting shell and fixedly connected to a slider slidably connected to the slide groove, the area of ​​the filter plate being larger than the area of ​​the second filter cartridge, the first filter cartridge, the second filter cartridge and the filter plate all having a first filter hole, and the side wall of the mounting shell having a portion located around the slot having a plurality of second filter holes, and when the filter plate is attached to the outer wall of the mounting shell, the plurality of second filter holes overlap with the first filter holes on the filter plate one by one.

[0014] The present invention is further configured as follows: the side projection of the connecting rod is Z-shaped, comprising a first connecting portion whose end is hinged to the inner wall of the second filter cartridge, and a second connecting portion whose end is hinged to the drive disk, and the height of the first connecting portion is lower than that of the second connecting portion.

[0015] The present invention is further configured as follows: the first filter hole on the filter plate is an inclined hole, and one end thereof away from the interior of the mounting shell is inclined upward.

[0016] The present invention is further configured as follows: a plurality of water inlets are evenly distributed on the bottom of the valve body, the exhaust port is located directly above the valve body, the air inlet and the drain port are both located on the side wall of the valve body, the valve cavity is configured as a capsule, the top and bottom of the float are both hemispherical, and when the float is located at the bottom of the valve cavity, the air intake direction of the air inlet corresponds to the hemispherical side wall of the top of the float.

[0017] The present invention is further configured as follows: a mounting ring is provided at the bottom edge of the outer wall of the mounting shell, and a plurality of screws connected to the bottom of the foundation pit body are provided at the outer edge of the mounting ring.

[0018] A method for using a foundation pit drainage device for water conservancy and hydropower construction, comprising the following steps: S1. Level the ground around the foundation pit at the opening of the water collection well, and place the installation shell cover at the opening of the water collection well; S2. When water accumulates in the foundation pit, the accumulated water is drained into the water collection well, the pump is started, and the filtered sewage in the water collection well is pumped out through the pumping pipe; S3. When too much silt is accumulated outside the installation shell, the water inflow speed in the water collection well is lower than the water discharge speed of the pumping pipe, the water level in the water collection well drops, the floating block in the valve body falls, the water inlet and the discharge port are closed, the air inlet and the exhaust port are opened, the pump body draws air through the air pipe, the air flow passes through the air pipe and drives the impeller to rotate, and through the transmission of the first bevel gear and the second bevel gear, the driving disc drives the connecting rod to move and push the filter shell out, the silt accumulated outside the installation shell is pushed away, and the sewage enters the water through the filter shell around; S4. When the water level in the water collection well rises, the floating block in the valve body floats up, closing the air inlet and exhaust port, opening the water inlet and drain port, and the sewage in the water collection well is pumped out again through the pumping pipe; S5. When there is no visible water accumulation in the foundation pit and no sewage is discharged from the outlet of the pump body, close the pump body.

[0019] The beneficial effects of the present invention are: 1. When water accumulates in the foundation pit, the accumulated water can be drained into the water collection well by the water diversion trough or slope surface in the foundation pit, and when the accumulated water passes through the filter shell, most of the sediment particles are filtered outside the installation shell, reducing the situation of sediment entering the water collection well. When the water level in the water collection well rises to a certain level, the pump body is started to pump out the filtered sewage in the water collection well through the pumping pipe; 2. When too much sediment is accumulated outside the installation shell, the water inflow speed in the water collection well is lower than the drainage speed of the pumping pipe, the water level in the water collection well drops, the floating block in the valve body falls, the water inlet and the drainage port are closed, the air inlet and the exhaust port are opened, and the pump body draws air through the air pipe, so that the air flow passes through the air pipe and drives the impeller to rotate, and through the transmission of the first bevel gear and the second bevel gear, the driving disc drives the connecting rod to move and push the filter shell out, the sediment accumulated outside the installation shell is pushed away, and the sewage flows in through the filter shell around. When the water level in the water collection well rises, the floating block in the valve body floats up, the air inlet and the exhaust port are closed, the water inlet and the drainage port are opened, and the sewage in the water collection well is pumped out through the pumping pipe again; 3. By setting the filter shell as a telescopic shell, when the connecting rod pushes the second filter cartridge to move, it can extend at least two sections, so that the sediment outside the installation shell can be pushed to a farther distance through the filter plate, reducing the impact on the water inflow of the installation shell; 4. By setting the valve cavity in a capsule shape and setting the top and bottom of the float block in a hemispherical shape, when the float block is at the bottom of the valve cavity, the air inlet corresponds to the top of the float block. When the airflow blows the top of the float block, it generates downward pressure on the float block, so that the water inlet and the drain port are more tightly closed; 5. By setting the first filter hole on the filter plate as an inclined hole, sewage can enter from the upper oblique direction toward the first filter hole when entering the water, thereby reducing the disturbance of the sediment on the bottom of the foundation pit outside the installation shell, thereby reducing the situation where the sediment docks outside the installation shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 It is a schematic structural diagram of the filter shell part in the present invention.

[0022] Figure 3 It is a cross-sectional view of the whole of the present invention.

[0023] Figure 4 It is a cross-sectional view of the mounting shell portion of the present invention.

[0024] Figure 5 yes Figure 4 A partial enlarged view of part A.

[0025] Figure 6 yes Figure 3 A partial enlarged view of part B.

[0026] Figure 7 yes Figure 3 A partial enlarged view of part C.

[0027] In the figure: 1, foundation pit body; 2, pump body; 3, water pumping pipe; 4, water collection well; 5, mounting shell; 6, mounting ring; 7, screw; 8, slot; 9, filter shell; 10, first filter cartridge; 11, second filter cartridge; 12, filter plate; 13, positioning ring; 14, slide groove; 15, slider; 16, first filter hole; 17, second filter hole; 18, driving mechanism; 19, fixing sleeve; 20, driving shaft; 21, driving member; 2 2. Drive disk; 23. Connecting piece; 24. Connecting rod; 25. First connecting part; 26. Second connecting part; 27. Tee; 28. Air pipe; 29. ​​One-way valve; 30. Switching valve; 31. Valve body; 32. Valve cavity; 33. Float; 34. Air inlet; 35. Exhaust port; 36. Water inlet; 37. Drain port; 38. Expansion shell; 39. First bevel gear; 40. Second bevel gear; 41. Impeller; 42. Reset torsion spring. DETAILED DESCRIPTION

[0028] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the present invention is further described below with reference to specific illustrations.

[0029] like Figure 1-Figure 7 As shown, a foundation pit drainage device for water conservancy and hydropower construction includes a foundation pit body 1, a pump body 2 arranged on the top of the foundation pit body 1, a pumping pipe 3 connected to the water inlet end of the pump body 2, a water collection well 4 opened in the foundation pit body 1, and a retention piece arranged at the opening of the water collection well 4. The pumping pipe 3 passes through the top of the installation shell 5 and extends into the water collection well 4.

[0030] Among them, the intercepting member includes a mounting shell 5 with an open bottom and covering the opening of the water collection well 4, and filtering members respectively arranged around the mounting shell 5. The mounting shell 5 is a rectangular structure. To facilitate the installation of the mounting shell 5, a mounting ring 6 is provided at the bottom edge of the outer wall of the mounting shell 5, and a plurality of screws 7 connected to the bottom of the foundation pit body 1 are provided on the outer edge of the mounting ring 6.

[0031] When water accumulates in the foundation pit, the accumulated water can be drained into the water collection well 4 by the water diversion trough or slope surface in the foundation pit, and when the accumulated water passes through the filter shell 9, most of the sediment particles are filtered outside the installation shell 5, reducing the situation of sediment entering the water collection well 4. When the water level in the water collection well 4 rises to a certain level, the pump body 2 is started to pump out the filtered sewage in the water collection well 4 through the pumping pipe 3.

[0032] Slots 8 are provided on the side walls around the installation shell 5. The filter element includes a filter shell 9 that is slidably inserted into the slot 8. The filter shell 9 is in a rectangular shell shape and one end facing the inside of the installation shell 5 is open. In order to increase the pushing stroke of the filter shell 9 on the sediment, the filter shell 9 is preferably set as a telescopic shell. Thereby increasing the extended length, the sediment outside the installation shell 5 can be pushed to a farther distance through the filter shell 9, reducing the impact on the water inflow of the installation shell 5.

[0033] Specifically, the filter shell 9 includes a first filter cartridge 10, a second filter cartridge 11 slidably inserted into the first filter cartridge 10, and a filter plate 12 fixedly connected to the end of the second filter cartridge 11 away from the mounting shell 5. A positioning ring 13 is fixedly connected to the outer edge of one end of the first filter cartridge 10 located in the mounting shell 5. A slide groove 14 extending along the length direction is provided on the inner wall of the first filter cartridge 10. A slider 15 slidably connected to the slide groove 14 is fixedly connected to the end of the outer wall of the second filter cartridge 11 close to the mounting shell 5. The area of ​​the filter plate 12 is larger than that of the second filter cartridge 11 and is equivalent to the area of ​​the side wall of the mounting shell 5.

[0034] The first filter cartridge 10, the second filter cartridge 11 and the filter plate 12 are all provided with first filter holes 16, wherein the first filter holes 16 on the filter plate 12 are inclined holes, and the end thereof away from the inside of the installation shell 5 is inclined upward. The first filter holes 16 on the filter plate 12 are set as inclined holes, so that sewage enters from the upper oblique direction toward the first filter holes 16 when entering the water, thereby reducing the disturbance of the sediment on the bottom surface of the foundation pit outside the installation shell 5, thereby reducing the situation where the sediment docks outside the installation shell 5.

[0035] A plurality of second filter holes 17 are formed on the side wall of the mounting shell 5 around the slot 8. When the filter plate 12 is attached to the outer wall of the mounting shell 5, the plurality of second filter holes 17 overlap with the first filter holes 16 on the filter plate 12 one by one. When the second filter cartridge 11 is completely located in the first filter cartridge 10, the first filter holes 16 on the first filter cartridge 10 and the second filter cartridge 11 overlap one by one.

[0036] A driving mechanism 18 for driving the filter shell 9 to slide is provided on the mounting shell 5, and the driving mechanism 18 includes a fixed sleeve 19 fixedly connected to the inner top surface of the mounting shell 5, a driving shaft 20 rotatably connected to the fixed sleeve 19, a driving member 21 connected to the driving shaft 20, a driving disk 22 fixedly connected to the bottom end of the driving shaft 20 and located below the fixed sleeve 19, and a plurality of connecting members 23 respectively connected between the driving disk 22 and the filter shell 9, wherein the connecting member 23 includes a connecting rod 24, one end of the connecting rod 24 is hinged to one end of the second filter shell 9 close to the inner part of the mounting shell 5 and the other end is hinged to the driving disk 22.

[0037] The side projection of the connecting rod 24 is Z-shaped, and includes a first connecting portion 25 whose end is hinged to the inner wall of the second filter cylinder 11, and a second connecting portion 26 whose end is hinged to the driving disk 22. The height of the first connecting portion 25 is lower than the second connecting portion 26. When the driving disk 22 rotates and drives the second connecting portion 26 away from the filter shell 9, the first connecting portion 25 and the second connecting portion 26 between two adjacent connecting rods 24 are staggered, and at this time, the filter plate 12 is attached to the outer peripheral wall of the mounting shell 5.

[0038] The water pumping pipe 3 is provided with a tee 27, one end of the side of the tee 27 is connected to an air pipe 28, and in order to prevent water in the water pumping pipe 3 from entering the air pipe 28, a one-way valve 29 is provided at the connection between the air pipe 28 and the tee 27, and the bottom of the air pipe 28 and the water pumping pipe 3 are connected to a switching valve 30 for closing the air pipe 28 while opening the water pumping pipe 3, or opening the air pipe 28 while closing the water pumping pipe 3; the switching valve 30 includes a valve body 31, a valve body 31 disposed in the valve body 31 and extending along a vertical direction. A valve cavity 32 extending in the direction of rotation, a floating block 33 slidably connected to the valve cavity 32, an air inlet 34 and an exhaust port 35 are provided at the top of the valve body 31, a water inlet 36 and a drain port 37 are provided at the bottom of the valve body 31, the exhaust port 35 and the drain port 37 are respectively connected to the air pipe 28 and the water pumping pipe 3, when the floating block 33 is located at the top of the valve cavity 32, the air inlet 34 and the exhaust port 35 are closed, when the floating block 33 is located at the bottom of the valve cavity 32, the water inlet 36 and the drain port 37 are closed.

[0039] A plurality of water inlets 36 are evenly distributed at the bottom of the valve body 31, the exhaust port 35 is located just above the valve body 31, the air inlet 34 and the drain port 37 are both located on the side wall of the valve body 31, the valve cavity 32 is set to be capsule-shaped, the top and bottom of the floating block 33 are both hemispherical, and when the floating block 33 is located at the bottom of the valve cavity 32, the air intake direction of the air inlet 34 corresponds to the hemispherical side wall at the top of the floating block 33. By setting the valve cavity 32 to be capsule-shaped, and setting the top and bottom of the floating block 33 to be hemispherical, when the floating block 33 is located at the bottom of the valve cavity 32, the air inlet 34 corresponds to the top of the floating block 33, and when the airflow blows the top of the floating block 33, downward pressure is generated on the floating block 33, so that the water inlet 36 and the drain port 37 are more tightly closed.

[0040] The driving member 21 includes an expansion shell 38 connected to the side wall of the fixed sleeve 19, a first bevel gear 39 coaxially fixedly connected to the driving shaft 20, a second bevel gear 40 rotatably connected to the expansion shell 38 and meshing with the first bevel gear 39, an impeller 41 connected to one end of the second bevel gear 40, and a return torsion spring 42 arranged between the fixed sleeve 19 and the driving shaft 20. The air pipe 28 is connected to one side of the expansion shell 38 and the air flow direction of the air pipe 28 is along the tangential direction of the outer edge of the impeller 41.

[0041] The first bevel gear 39 and the second bevel gear 40 are both bevel gears with a helical angle less than or equal to 45°. The first bevel gear 39 and the second bevel gear 40 cooperate to form a staggered shaft transmission, that is, the first bevel gear 39 and the second bevel gear 40 can both be used as driving wheels for transmission. When the airflow passes through the air pipe 28, the impeller 41 and the second bevel gear 40 are driven to rotate, so as to overcome the elastic force of the return torsion spring 42 and make the first bevel gear 39 rotate accordingly. When there is no airflow passing through the air pipe 28, the torsion of the return torsion spring 42 drives the first bevel gear 39 to rotate, thereby driving the impeller 41 and the second bevel gear 40 to reverse, and retract the second filter cartridge 11 into the first filter cartridge 10 through the connecting rod 24, and the filter plate 12 conflicts with the first filter cartridge 10. In addition, the transmission ratio of the first bevel gear 39 and the second bevel gear 40 can be adjusted according to the actual working conditions, and is not limited to the transmission mode of the bevel gear, such as bevel gear, curve gear transmission or even belt transmission.

[0042] A method for using a foundation pit drainage device for water conservancy and hydropower construction, comprising the following steps: S1. Level the ground around the opening of the foundation pit 4, and install the installation shell 5 at the opening of the water collection well 4; S2. When water accumulates in the foundation pit, the accumulated water is drained into the water collection well 4, the pump body 2 is started, and the filtered sewage in the water collection well 4 is pumped out through the pumping pipe 3; S3. When too much silt is accumulated outside the installation shell 5, the water inflow speed in the water collection well 4 is lower than the water discharge speed of the pumping pipe 3, the water level in the water collection well 4 drops, the floating block 33 in the valve body 31 falls, the water inlet 36 and the water discharge port 37 are closed, the air inlet 34 and the air discharge port 35 are opened, and the pump body 2 draws air through the air pipe 28, so that the air flow passes through the air pipe 28 and drives the impeller 41 to rotate, and through the transmission of the first bevel gear 39 and the second bevel gear 40, the driving disc 22 drives the connecting rod 24 to move and push the filter shell 9 out, the silt accumulated outside the installation shell 5 is pushed away, and the sewage enters the water through the filter shell 9 around; S4, when the water level in the water collection well 4 rises, the floating block 33 in the valve body 31 floats up, closing the air inlet 34 and the exhaust port 35, opening the water inlet 36 and the drain port 37, and the sewage in the water collection well 4 is pumped out again through the pumping pipe 3; S5. When there is no visible water accumulation in the foundation pit and no sewage is discharged from the outlet of pump body 2, close pump body 2.

[0043] The implementation principle of the present invention is: When too much silt accumulates outside the mounting shell 5, the water inlet speed in the water collection well 4 is lower than the water discharge speed of the pumping pipe 3, the water level in the water collection well 4 drops, the floating block 33 in the valve body 31 falls, the water inlet 36 and the water discharge port 37 are closed, the air inlet 34 and the air discharge port 35 are opened, and the pump body 2 draws air through the air pipe 28, so that the air flow passes through the air pipe 28 and drives the impeller 41 to rotate, and through the transmission of the first bevel gear 39 and the second bevel gear 40, the driving disk 22 drives the connecting rod 24 to move and push the filter shell 9 out, the silt accumulated outside the mounting shell 5 is pushed away, and the sewage enters the filter shell 9 through the surrounding areas. When the water level in the water collection well 4 rises, the floating block 33 in the valve body 31 floats up, the air inlet 34 and the air discharge port 35 are closed, the water inlet 36 and the water discharge port 37 are opened, and the sewage in the water collection well 4 is pumped out through the pumping pipe 3 again.

[0044] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A foundation pit drainage device for water conservancy and hydropower construction, characterized in that: It comprises a foundation pit body (1), a pump body (2) arranged on the top of the foundation pit body (1), a water pumping pipe (3) connected to the water inlet end of the pump body (2), a water collection well (4) opened in the foundation pit body (1), and a retaining member arranged at the opening of the water collection well (4); The intercepting member comprises a mounting shell (5) with an open bottom and covering the opening of the water collecting well (4), and filter members respectively arranged around the mounting shell (5), the side walls of the mounting shell (5) are provided with slots (8), the filter member comprises a filter shell (9) slidably inserted into the slots (8), the filter shell (9) is in a shell shape and one end facing the inside of the mounting shell (5) is open, the mounting shell (5) is provided with a driving mechanism (18) for driving the filter shell (9) to slide, the filter shell (9) is evenly distributed with a plurality of first filter holes (16), and the water suction pipe (3) passes through the top of the mounting shell (5) and extends into the water collecting well (4).

2. A foundation pit drainage device for water conservancy and hydropower construction according to claim 1, characterized in that: The driving mechanism (18) comprises a fixing sleeve (19) fixedly connected to the inner top surface of the mounting shell (5), a driving shaft (20) rotatably connected to the fixing sleeve (19), a driving member (21) connected to the driving shaft (20), a driving disk (22) fixedly connected to the bottom end of the driving shaft (20) and located below the fixing sleeve (19), and a plurality of connecting members (23) respectively connected between the driving disk (22) and the filter shell (9), wherein the connecting member (23) comprises a connecting rod (24), one end of the connecting rod (24) is hinged to the filter shell (9) and the other end is hinged to the driving disk (22).

3. A foundation pit drainage device for water conservancy and hydropower construction according to claim 2, characterized in that: The water extraction pipe (3) is provided with a tee (27), one end of the tee (27) is connected to an air pipe (28), and the air pipe (28) and the bottom end of the water extraction pipe (3) are connected to a switching valve (30) for closing the air pipe (28) and opening the water extraction pipe (3), or opening the air pipe (28) and closing the water extraction pipe (3); The driving member (21) comprises an expansion shell (38) connected to the side wall of the fixed sleeve (19), a first bevel gear (39) coaxially fixedly connected to the driving shaft (20), a second bevel gear (40) rotatably connected to the expansion shell (38) and meshing with the first bevel gear (39), an impeller (41) connected to one end of the second bevel gear (40), and a return torsion spring (42) arranged between the fixed sleeve (19) and the driving shaft (20); the air pipe (28) is connected to one side of the expansion shell (38), and the air flow direction of the air pipe (28) is along the tangential direction of the outer edge of the impeller (41).

4. A foundation pit drainage device for water conservancy and hydropower construction according to claim 3, characterized in that: The switching valve (30) comprises a valve body (31), a valve cavity (32) opened in the valve body (31) and extending in a vertical direction, and a float (33) slidably connected to the valve cavity (32); an air inlet (34) and an air outlet (35) are opened at the top of the valve body (31); a water inlet (36) and a water outlet (37) are opened at the bottom of the valve body (31); the air outlet (35) and the water outlet (37) are respectively connected to the air pipe (28) and the water pumping pipe (3); when the float (33) is located at the top of the valve cavity (32), the air inlet (34) and the air outlet (35) are closed; when the float (33) is located at the bottom of the valve cavity (32), the water inlet (36) and the water outlet (37) are closed.

5. A foundation pit drainage device for water conservancy and hydropower construction according to claim 4, characterized in that: The filter housing (9) is a telescopic housing, comprising a first filter cartridge (10), a second filter cartridge (11) slidably inserted into the first filter cartridge (10), and a filter plate (12) fixedly connected to an end of the second filter cartridge (11) away from the mounting housing (5); a positioning ring (13) is fixedly connected to the outer edge of one end of the first filter cartridge (10) located in the mounting housing (5); a sliding groove (14) extending along the length direction thereof is provided on the inner wall of the first filter cartridge (10); and a filter plate (12) is fixedly connected to an end of the second filter cartridge (11) close to the mounting housing (5). A slider (15) is fixedly connected to the slide groove (14), the area of ​​the filter plate (12) is larger than the area of ​​the second filter cartridge (11), the first filter cartridge (10), the second filter cartridge (11) and the filter plate (12) are all provided with first filter holes (16), and a portion of the side wall of the mounting shell (5) located around the slot (8) is provided with a plurality of second filter holes (17), and when the filter plate (12) is attached to the outer wall of the mounting shell (5), the plurality of second filter holes (17) overlap with the first filter holes (16) on the filter plate (12) in a one-to-one correspondence.

6. A foundation pit drainage device for water conservancy and hydropower construction according to claim 5, characterized in that: The connecting rod (24) has a Z-shaped side projection, and comprises a first connecting portion (25) whose end is hinged to the inner wall of the second filter cylinder (11), and a second connecting portion (26) whose end is hinged to the driving disk (22), wherein the first connecting portion (25) is lower in height than the second connecting portion (26).

7. A foundation pit drainage device for water conservancy and hydropower construction according to claim 5, characterized in that: The first filter hole (16) on the filter plate (12) is an inclined hole, and the end thereof away from the interior of the mounting shell (5) is inclined upward.

8. A foundation pit drainage device for water conservancy and hydropower construction according to claim 4, characterized in that: A plurality of water inlets (36) are evenly distributed at the bottom of the valve body (31); the exhaust port (35) is located directly above the valve body (31); the air inlet (34) and the water outlet (37) are both located on the side wall of the valve body (31); the valve cavity (32) is configured to be capsule-shaped; the top and bottom of the floating block (33) are both hemispherical; when the floating block (33) is located at the bottom of the valve cavity (32), the air intake direction of the air inlet (34) corresponds to the hemispherical side wall at the top of the floating block (33).

9. A foundation pit drainage device for water conservancy and hydropower construction according to claim 1, characterized in that: A mounting ring (6) is provided at the bottom edge of the outer wall of the mounting shell (5), and a plurality of screws (7) connected to the bottom of the foundation pit body (1) are provided at the outer edge of the mounting ring (6).

10. A method for using the foundation pit drainage device for water conservancy and hydropower construction according to any one of claims 1 to 9, characterized in that: The steps include: S1, leveling the ground around the opening of the water collection well (4) in the foundation pit, and installing the installation shell (5) at the opening of the water collection well (4); S2. When water accumulates in the foundation pit, the accumulated water is drained into the water collection well (4), the pump body (2) is started, and the filtered sewage in the water collection well (4) is pumped out through the pumping pipe (3); S3. When too much silt is accumulated outside the installation shell (5), the water inflow speed in the water collection well (4) is lower than the water discharge speed of the pumping pipe (3), the water level in the water collection well (4) drops, the floating block (33) in the valve body (31) falls, the water inlet (36) and the water discharge port (37) are closed, the air inlet (34) and the air discharge port (35) are opened, the pump body (2) draws air through the air pipe (28), the air flow passes through the air pipe (28) and drives the impeller (41) to rotate, and through the transmission of the second bevel gear (40) and the first bevel gear (39), the driving disc (22) drives the connecting rod (24) to move and push the filter shell (9) out, the silt accumulated outside the installation shell (5) is pushed away, and the sewage enters the filter shell (9) from all sides; S4: When the water level in the water collection well (4) rises, the floating block (33) in the valve body (31) floats up, closing the air inlet (34) and the air outlet (35), opening the water inlet (36) and the water outlet (37), and the sewage in the water collection well (4) is pumped out again through the pumping pipe (3); S5. When there is no visible water accumulation in the foundation pit and no sewage is discharged from the outlet of the pump body (2), close the pump body (2).

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