A foundation pit drainage device for water conservancy and hydropower construction and its usage method

Abstract

The present invention relates to a foundation pit drainage device for water conservancy and hydropower construction and its usage method, belonging to the technical field of water conservancy construction equipment. It includes a foundation pit body, a pump body arranged at the top of the foundation pit body, a water suction pipe connected to the water inlet end of the pump body, a sump well opened in the foundation pit body, and an intercepting member arranged at the opening of the sump well; the intercepting member includes an installation shell with an open bottom and covering the opening of the sump well, and filter members respectively arranged around the installation shell. Slots are opened on the side walls around the installation shell. The filter member includes a filter shell slidably inserted into the slot. The filter shell is in a shell shape and has an open end facing the inside of the installation shell. A driving mechanism for driving the sliding of the filter shell is arranged on the installation shell. A number of first filter holes are evenly distributed on the filter shell. The water suction pipe passes through the top of the installation shell and extends into the sump well. Through the present invention, the problem that in the prior art, workers need to go down into the foundation pit to clean the sediment is solved.

Description

Technical Field

[0001] The present invention relates to a foundation pit drainage device for water conservancy and hydropower construction and its usage method, belonging to the technical field of water conservancy construction equipment. Background Art

[0002] A foundation pit is an earth pit excavated at the designed position of the foundation according to the base elevation and the foundation plane dimensions. During the rainy season, excessive precipitation or large groundwater seepage volume can easily cause water accumulation in the foundation pit. If the accumulated water is not drained in time, it will not only affect the construction period, but even erode the foundation, causing significant harm to the building quality. Drainage ditches are excavated around the bottom of the foundation pit, and some drainage ditches are equipped with sump wells. The accumulated water in the foundation pit enters the sump well after passing through the drainage ditches. Currently, when draining the foundation pit, the water suction pipe is usually placed in the sump well of the foundation pit, and the accumulated water is pumped outwards through a water pump. Since there are impurities such as sediment and construction waste in the foundation pit, the impurities flow into the sump well together with the accumulated water, and the water suction pipe is prone to blockage during pumping, resulting in the interruption of pumping and affecting the drainage efficiency.

[0003] In view of the above technical problems, a dam foundation pit drainage device disclosed in the Chinese utility model patent with the publication number CN211228564U has the following technical key points: it includes a water pump located above the foundation pit, a water suction pipe extending into the foundation pit is provided on the water pump, and it also includes a sump pit opened at the bottom of the foundation pit. A filter box partially extending out of the sump pit is provided in the sump pit. Filter grooves are respectively opened 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, and a filter mesh cloth for closing the filter groove is provided at the filter groove. The water suction pipe is located inside the filter box.

[0004] The above solution uses a filter mesh cloth to be arranged at the opening of the sump pit to prevent impurities from entering the sump pit. However, when there is a large amount of accumulated water in the foundation pit, the accumulated water cannot be drained into the sump well in time to lower the water level of the foundation pit.

[0005] After retrieval, a foundation pit drainage device and drainage method disclosed in the Chinese patent with the publication number CN118166808B have the following technical key points: it includes a housing, a first interception member, a second interception member, a collection chamber, and a water pump unit. The housing is arranged at the opening of the sump well, and a top plate is provided at the top of the housing; the first interception member is arranged on the outer periphery of the top of the housing to intercept large particle impurities; the second interception member is arranged inside the housing to intercept small particle impurities; the collection chamber is arranged outside the housing and is connected to the housing for collecting the small particle impurities intercepted by the second interception member; the water pump unit is arranged outside the foundation pit and is equipped with multiple water pumps, and each water pump is equipped with a first water suction pipe and a second water suction pipe. The water suction end of the first water suction pipe is located in the area enclosed by the first interception member, and the water suction end of the second water suction pipe passes through the second interception member and extends into the interior of the sump well.

[0006] The above solution uses a first interception member and a second interception member arranged at the opening of the catch basin to reduce the problem of sediment entering the catch basin. However, since sediment will still accumulate outside the first interception member, the dewatering efficiency of the catch basin will become lower and lower. Moreover, due to the large content of sewage and sediment in the foundation pit, it is unrealistic to control the flipping time of the second interception member for sludge and sediment discharge by driving an electric cylinder. Then, a collection chamber is used to collect sediment, and it is very easy for the collection chamber to be filled, causing all the sediment to accumulate in the shell. It is inconvenient for workers to enter the foundation pit to clean the collection chamber, and it is difficult to continue draining 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 its usage method, which solves the problem that workers need to enter the foundation pit to clean sediment in the prior art.

[0009] The technical problem to be solved by the present invention is achieved by adopting the following technical solutions:

[0010] A foundation pit drainage device for water conservancy and hydropower construction includes a foundation pit body, a pump body arranged at the top of the foundation pit body, a water suction pipe connected to the water inlet end of the pump body, a catch basin opened in the foundation pit body, and an interception member arranged at the opening of the catch basin;

[0011] The interception member includes an installation shell with an open bottom and covering the opening of the catch basin, and filter members respectively arranged around the installation shell. Slots are opened on the side walls around the installation shell. The filter member includes a filter shell slidably inserted into the slot. The filter shell is in a shell shape and has an open end facing the inside of the installation shell. A driving mechanism for driving the filter shell to slide is arranged on the installation shell. A number of first filter holes are evenly distributed on the filter shell, and the water suction pipe passes through the top of the installation shell and extends into the catch basin.

[0012] The present invention is further configured as: the driving mechanism includes a fixed sleeve fixedly connected to the inner top surface of the installation 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 number 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.

[0013] The present invention is further configured as: a tee joint is arranged on the water suction pipe, one end of the tee joint is connected to an air pipe, and a switching valve for closing the air pipe while opening the water suction pipe, or opening the air pipe while closing the water suction pipe is connected to the air pipe and the bottom end of the water suction pipe;

[0014] The driving member includes an expansion shell connected to the side wall of the fixed sleeve, a first bevel gear coaxially and fixedly connected to the driving shaft, a second bevel gear rotatably connected in the expansion shell and meshed with the first bevel gear, an impeller connected to one end of the second bevel gear, and a return torsion spring arranged between the fixed sleeve and the driving shaft. The air pipe is connected to one side of the expansion shell, and the air flow direction of the air pipe is along the tangent direction of the outer edge of the impeller.

[0015] 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 the vertical direction, and a floating block slidably connected in the valve cavity. An air inlet and an exhaust port are opened at the top of the valve body, and 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 suction 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.

[0016] The present invention is further configured as follows: The filter shell is a telescopic shell, which includes a first filter cylinder, a second filter cylinder slidably inserted into the first filter cylinder, and a filter plate fixedly connected to one end of the second filter cylinder away from the installation shell. A positioning ring is fixedly connected to the outer edge of one end of the first filter cylinder located in the installation shell. A chute extending along its length direction is opened on the inner wall of the first filter cylinder. A slider slidably connected in the chute is fixedly connected to the outer wall of the second filter cylinder near the installation shell. The area of the filter plate is larger than the area of the second filter cylinder. First filter holes are opened on the first filter cylinder, the second filter cylinder and the filter plate. A plurality of second filter holes are opened on the part of the side wall of the installation shell around the slot. When the filter plate fits against the outer wall of the installation shell, the plurality of second filter holes correspond and coincide with the first filter holes on the filter plate one by one.

[0017] The present invention is further configured as follows: The side projection of the connecting rod is in a Z shape, which includes a first connecting part with an end hinged to the inner wall of the second filter cylinder and a second connecting part with an end hinged to the driving disc. The height of the first connecting part is lower than that of the second connecting part.

[0018] The present invention is further configured as follows: The first filter holes on the filter plate are inclined holes, and the end away from the inside of the installation shell is inclined upward.

[0019] The present invention is further configured such that: a plurality of water inlets are evenly distributed at 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 in a capsule shape, the top and bottom of the floating block are both hemispherical, and when the floating block is located at the bottom of the valve cavity, the air inlet direction of the air inlet corresponds to the hemispherical side wall at the top of the floating block.

[0020] The present invention is further configured such that: an installation ring is provided at the bottom edge of the outer wall of the installation shell, and a plurality of screws connecting to the bottom of the foundation pit body are provided at the outer edge of the installation ring.

[0021] A method for using a foundation pit drainage device for water conservancy and hydropower construction includes the following steps:

[0022] S1. Level the ground around the opening of the catch basin where the foundation pit is located, and cover the installation shell over the opening of the catch basin;

[0023] S2. When there is accumulated water in the foundation pit, the accumulated water is drained into the catch basin, start the pump body, and pump out the filtered sewage in the catch basin through the water suction pipe;

[0024] S3. When too much sediment accumulates outside the installation shell, the water inlet speed in the catch basin is lower than the drainage speed of the water suction pipe, the water level in the catch basin drops, the floating block in the valve body falls, closes the water inlet and the drain port, opens the air inlet and the exhaust port, the pump body sucks 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 disk drives the connecting rod to move to push out the filter shell, the sediment accumulated outside the installation shell is pushed away, and the sewage enters through the periphery of the filter shell;

[0025] S4. When the water level in the catch basin rises, the floating block in the valve body floats up, closes the air inlet and the exhaust port, opens the water inlet and the drain port, and the sewage in the catch basin is pumped out again through the water suction pipe;

[0026] S5. When there is no visible accumulated water in the foundation pit and no sewage is discharged from the water outlet end of the pump body, turn off the pump body.

[0027] The beneficial effects of the present invention are:

[0028] 1. When there is accumulated water in the foundation pit, the accumulated water can be drained into the catch basin through the water diversion trough or the 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 catch basin. When the water level in the catch basin rises to a certain level, start the pump body, and pump out the filtered sewage in the catch basin through the water suction pipe;

[0029] 2. When too much sediment accumulates outside the installation shell, the water inlet speed in the sump is lower than the drainage speed of the suction pipe, the water level in the sump drops, the floating block in the valve body falls, closing the water inlet and the drainage port, opening the air inlet and the exhaust port, and the pump body sucks air through the air pipe, causing the air flow to pass through the air pipe and drive the impeller to rotate. Through the transmission of the first helical gear and the second helical gear, the driving disc drives the connecting rod to move and push out the filter shell, and the sediment accumulated outside the installation shell is pushed away. When the sewage enters through the periphery of the filter shell and the water level in the sump rises, the floating block in the valve body floats up, closing the air inlet and the exhaust port, opening the water inlet and the drainage port, and the sewage in the sump is pumped out again through the suction pipe;

[0030] 3. By setting the filter shell as a telescopic shell, when the connecting rod pushes the second filter cylinder to move, it can extend at least two lengths, 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 inlet of the installation shell;

[0031] 4. By setting the valve cavity to be capsule-shaped and setting both the top and bottom of the floating block to be hemispherical, when the floating block is at the bottom of the valve cavity, the air inlet corresponds exactly to the top of the floating block. When the air flow blows the top of the floating block, a downward pressure is generated on the floating block, making the water inlet and the drainage port closer;

[0032] 5. By setting the first filter holes on the filter plate as inclined holes, when the sewage enters, it enters the first filter holes from the upper oblique direction, reducing the disturbance to the sediment on the bottom surface of the foundation pit outside the installation shell, thereby reducing the situation of sediment docking outside the installation shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is the overall structural schematic diagram of the present invention.

[0034] Figure 2 is the structural schematic diagram of the filter shell part in the present invention.

[0035] Figure 3 is the overall cross-sectional view of the present invention.

[0036] Figure 4 is the cross-sectional view of the installation shell part in the present invention.

[0037] Figure 5 is Figure 4 the partial enlarged view of part A in

[0038] Figure 6 is Figure 3 the partial enlarged view of part B in

[0039] Figure 7 is Figure 3 the partial enlarged view of part C in

[0040] 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

[0041] 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.

[0042] like Figures 1-7 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] Specifically, the filter housing 9 includes a first filter cylinder 10, a second filter cylinder 11 slidably inserted into the first filter cylinder 10, and a filter plate 12 fixedly connected to one end of the second filter cylinder 11 away from the mounting housing 5. An outer edge of one end of the first filter cylinder 10 located inside the mounting housing 5 is fixedly connected with a positioning ring 13. A chute 14 extending along its length direction is formed on the inner wall of the first filter cylinder 10. A slider 15 slidably connected in the chute 14 is fixedly connected to one end of the outer wall of the second filter cylinder 11 close to the mounting housing 5. The area of the filter plate 12 is larger than that of the second filter cylinder 11 and is equivalent to the area of the side wall of the mounting housing 5.

[0047] First filter holes 16 are formed in the first filter cylinder 10, the second filter cylinder 11, and the filter plate 12. Among them, the first filter holes 16 on the filter plate 12 are inclined holes, and one end of the first filter holes 16 on the filter plate 12 away from the inside of the mounting housing 5 is inclined upward. The first filter holes 16 on the filter plate 12 are set as inclined holes so that when sewage enters, it enters the first filter holes 16 from the upper left, reducing the disturbance to the sediment at the bottom of the foundation pit outside the mounting housing 5, thereby reducing the situation of sediment connecting to the outside of the mounting housing 5.

[0048] A plurality of second filter holes 17 are formed in a part of the side wall of the mounting housing 5 around the slot 8. When the filter plate 12 fits against the outer wall of the mounting housing 5, the plurality of second filter holes 17 coincide with the first filter holes 16 on the filter plate 12 one by one. And when the second filter cylinder 11 is completely located inside the first filter cylinder 10, the first filter holes 16 on the first filter cylinder 10 and the second filter cylinder 11 coincide with each other one by one.

[0049] A driving mechanism 18 for driving the filter housing 9 to slide is provided on the mounting housing 5. The driving mechanism 18 includes a fixed sleeve 19 fixedly connected to the inner top surface of the mounting housing 5, a driving shaft 20 rotatably connected in 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 housing 9. Among them, 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 housing 9 close to the inside of the mounting housing 5, and the other end is hinged to the driving disk 22.

[0050] The side projection of the connecting rod 24 is in a Z shape. It 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 that of the second connecting portion 26. When the driving disk 22 rotates and drives the second connecting portion 26 away from the filter housing 9, the first connecting portion 25 and the second connecting portion 26 between two adjacent connecting rods 24 intersect, and at this time, the filter plate 12 fits against the outer peripheral wall of the mounting housing 5.

[0051] A tee joint 27 is provided on the water suction pipe 3. One end of the side of the tee joint 27 is connected with an air pipe 28. And to prevent the water in the water suction pipe 3 from entering the air pipe 28, a check valve 29 is provided at the connection between the air pipe 28 and the tee joint 27. The air pipe 28 and the bottom end of the water suction pipe 3 are jointly connected with a switching valve 30 for closing the air pipe 28 while opening the water suction pipe 3, or opening the air pipe 28 while closing the water suction pipe 3. The switching valve 30 includes a valve body 31, a valve cavity 32 opened in the valve body 31 and extending in the vertical direction, and a floating block 33 slidably connected in the valve cavity 32. An air inlet 34 and an air outlet 35 are opened at the top of the valve body 31, and 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 suction pipe 3. When the floating block 33 is located at the top of the valve cavity 32, the air inlet 34 and the air outlet 35 are closed. When the floating block 33 is located at the bottom of the valve cavity 32, the water inlet 36 and the water outlet 37 are closed.

[0052] A plurality of water inlets 36 are evenly distributed at the bottom of the valve body 31. The air outlet 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 set in a capsule shape. 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 inlet 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 in a capsule shape and setting both the top and bottom of the floating block 33 as hemispherical, when the floating block 33 is located at the bottom of the valve cavity 32, the air inlet 34 is exactly opposite to the top of the floating block 33. When the air flow blows the top of the floating block 33, a downward pressure is generated on the floating block 33, so that the water inlet 36 and the water outlet 37 are closed more tightly.

[0053] The driving member 21 includes an expansion shell 38 communicated with the side wall of the fixed sleeve 19, a first bevel gear 39 coaxially and fixedly connected to the driving shaft 20, a second bevel gear 40 rotatably connected in 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 communicated with one side of the expansion shell 38 and the air flow direction of the air pipe 28 is along the tangent direction of the outer edge of the impeller 41.

[0054] The first helical gear 39 and the second helical gear 40 are both helical gears with a helix angle less than or equal to 45°. The first helical gear 39 and the second helical gear 40 cooperate to form a crossed-axis drive, that is, both the first helical gear 39 and the second helical gear 40 can be used as the driving wheel for transmission. When the air flow passes through the air pipe 28, it drives the impeller 41 and the second helical gear 40 to rotate, so as to overcome the elastic force of the return torsion spring 42 and make the first helical gear 39 rotate accordingly. When there is no air flow passing through the air pipe 28, the torsion of the return torsion spring 42 drives the first helical gear 39 to rotate, thereby driving the impeller 41 and the second helical gear 40 to rotate in reverse, and through the connecting rod 24, the second filter cartridge 11 is retracted into the first filter cartridge 10, and the filter plate 12 abuts against the first filter cartridge 10. In addition, the transmission ratio of the first helical gear 39 and the second helical gear 40 can be adjusted according to the actual working conditions, and it is not limited to the transmission mode of helical gears, such as bevel gears, curve gear transmissions or even belt transmissions, etc.

[0055] A usage method of a foundation pit drainage device for water conservancy and hydropower construction includes the following steps:

[0056] S1. Level the ground around the opening of the sump 4 in the foundation pit, and cover the installation shell 5 on the opening of the sump 4;

[0057] S2. When there is accumulated water in the foundation pit, the accumulated water is drained into the sump 4, the pump body 2 is started, and the filtered sewage in the sump 4 is pumped out through the water suction pipe 3;

[0058] S3. When too much sediment accumulates outside the installation shell 5, the water inlet speed in the sump 4 is lower than the drainage speed of the water suction pipe 3, the water level in the sump 4 drops, the floating block 33 in the valve body 31 drops, closes the water inlet 36 and the drain port 37, opens the air inlet 34 and the exhaust port 35, the pump body 2 sucks 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 helical gear 39 and the second helical gear 40, the driving disk 22 drives the connecting rod 24 to move to push out the filter shell 9, the sediment accumulated outside the installation shell 5 is pushed away, and the sewage enters through the periphery of the filter shell 9;

[0059] S4. When the water level in the sump 4 rises, the floating block 33 in the valve body 31 floats, closes the air inlet 34 and the exhaust port 35, opens the water inlet 36 and the drain port 37, and the sewage in the sump 4 is pumped out again through the water suction pipe 3;

[0060] S5. When there is no visible accumulated water in the foundation pit and no sewage is discharged from the water outlet end of the pump body 2, the pump body 2 is turned off.

[0061] The implementation principle of the present invention is:

[0062] When too much sediment accumulates outside the installation shell 5, the water inlet speed in the sump 4 is lower than the drainage speed of the water extraction pipe 3. The water level in the sump 4 drops, the floating block 33 in the valve body 31 falls, closing the water inlet 36 and the drainage port 37, and opening the air inlet 34 and the exhaust port 35. The pump body 2 extracts air through the air pipe 28, causing the air flow to pass through the air pipe 28 and drive the impeller 41 to rotate. 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 to push out the filter shell 9. The sediment accumulated outside the installation shell 5 is pushed away, and the sewage enters through the periphery of the filter shell 9. When the water level in the sump 4 rises, the floating block 33 in the valve body 31 floats up, closing the air inlet 34 and the exhaust port 35, and opening the water inlet 36 and the drainage port 37. The sewage in the sump 4 is extracted again through the water extraction pipe 3.

[0063] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of protection required by the present invention. The scope of protection required by the present invention is defined by the appended 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); 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); 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); 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.

2. A foundation pit drainage device for water conservancy and hydropower construction according to claim 1, 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.

3. A foundation pit drainage device for water conservancy and hydropower construction according to claim 2, 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).

4. A foundation pit drainage device for water conservancy and hydropower construction according to claim 2, 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.

5. A foundation pit drainage device for water conservancy and hydropower construction according to claim 1, 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).

6. 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).

7. A method for using a foundation pit drainage device for water conservancy and hydropower construction according to any one of claims 1 to 6, characterized in that: The steps include: S1, leveling the ground around the opening of the water collection well (4) in the foundation pit, and placing the installation shell (5) over 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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