Device facilitating drainage of foundation pit

Abstract

The utility model relates to the technical field of drainage devices, and discloses a convenient foundation pit drainage device which comprises a foundation pit body, a box body is arranged in the foundation pit body, a cavity is formed in the front side face of the box body, a slidable filter plate is arranged at an opening of the cavity, and a plurality of filter grooves communicated with the cavity are formed in the filter plate in the height direction of the filter plate. A cavity is formed in the foundation pit body, a filtering groove is formed in the foundation pit body and used for filtering water entering the cavity, a movable moving plate is arranged in the cavity, a cleaning block is arranged on the moving plate, a driving assembly is further arranged in the cavity, a mounting assembly is further arranged in the cavity, and a drainage mechanism used for pumping water in the cavity is further arranged on the foundation pit body. By means of the structure, when water in the foundation pit body enters the cavity, the driving assembly drives the cleaning block on the moving plate to scrape and sweep the filtering groove, and therefore the situation that garbage is attached to the filtering plate, the effect that the water in the foundation pit body enters the cavity is poor, and pumping of the water in the foundation pit body by the water pumping pipe is affected can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of drainage devices, in particular to a device for draining a foundation pit. Background Art

[0002] The foundation pit is a soil pit excavated at the foundation design position according to the base elevation and foundation plane dimensions. When excavating the foundation pit, if the horizontal position of the foundation pit is lower than the groundwater level, groundwater can easily enter the foundation pit, causing the construction in the foundation pit to be affected. Therefore, the water in the foundation pit needs to be drained.

[0003] For example, a foundation pit drainage structure disclosed in the patent with publication number CN220888694U, although this structure can block the silt through the filter frame to prevent the silt from entering the filter frame, the connecting pipe extends from the water outlet into the filter frame to suck out the water in the filter frame, effectively preventing the silt from being sucked into the water pump, thereby ensuring the service life of the water pump; however, when this foundation pit drainage structure is actually used, the scraper cannot scrape the outer wall of the connecting frame, so that the outer wall of the connecting frame is easily blocked by garbage (such as leaves) in the foundation pit, resulting in the water in the foundation pit being unable to pass through the connecting frame into the filter frame, thereby affecting the water pump to extract the water in the filter frame, and it is deliberately left to be improved. Utility Model Content

[0004] The purpose of the utility model is to provide a device for facilitating foundation pit drainage, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] A device for facilitating foundation pit drainage comprises a foundation pit body, a box body is provided in the foundation pit body, a cavity is provided on the front side of the box body, a slidable filter plate is provided at the opening of the cavity, a plurality of filter slots communicating with the cavity are provided on the filter plate along its height direction, the filter slots are used to filter water entering the cavity, a movable movable plate is provided in the cavity, a cleaning block with one end extending out of the filter slot is provided at each corresponding filter slot on the movable plate, a driving component is further provided in the cavity for driving the movable plate to drive the cleaning block to move up and down to scrape the filter slot, an installation component is also provided in the cavity, the installation component is used to drive the movable plate to drive the cleaning block to insert or slide out of the corresponding filter slot, thereby realizing the disassembly and assembly of the filter plate at the cavity opening, and a drainage mechanism for extracting water in the cavity is also provided on the foundation pit body.

[0007] Preferably, the opposite side walls of the cavity are provided with protrusions, and a rotatable threaded rod is provided in the cavity;

[0008] The driving assembly includes a driving plate arranged in the cavity and with both ends respectively engaged in corresponding protrusions. The driving plate is provided with a threaded ring that cooperates with the thread of the rotating rod. Both ends of the driving plate are provided with a retractable telescopic rod with one end connected to the movable plate. The rotation of the threaded rod is used to drive the threaded ring to drive the driving plate to rise and fall, so that the movable plate drives the cleaning block to scrape the filter tank.

[0009] Preferably, the telescopic rod includes a mounting block arranged on the driving plate, a mounting cavity with an open end provided in the mounting block, a mounting ring provided at the opening of the mounting cavity, a fixing plate provided in the mounting cavity, a fixing rod provided on the fixing plate with one end passing through the mounting ring and connected to the movable plate, and a spring for pushing the fixing plate toward the mounting ring is also provided in the mounting cavity.

[0010] Preferably, a support is provided on the movable plate, a mounting plate is provided on the driving plate, a rotatable rotating rod is provided in the cavity, and opposite clamping blocks are provided on the side walls of the rotating rod along its height direction;

[0011] The mounting assembly includes a circular plate provided on the mounting plate and through which the rotating rod passes. The circular plate can be rotatably arranged. A card slot is provided on the circular plate for the corresponding card block to be inserted. A hinged rod is provided between the circular plate and the support. The two ends of the hinged rod are respectively hingedly connected to the circular plate and the support. The rotation of the rotating rod is used to drive the circular plate to rotate, so that the cleaning block on the movable plate can slide out of the filter tank.

[0012] Preferably, a vertical rod is provided on the upper end surface of the circular plate near the edge, one end of the hinged rod is sleeved on the vertical rod, and an insertion rod with one end passing through the other end of the hinged rod is provided on the support.

[0013] Preferably, one end of the rotating rod is extended out of the box body, and the extended end of the rotating rod is provided with a handle for driving the rotating rod to rotate.

[0014] Preferably, limiting grooves are provided on the opposite side walls of the cavity along the length direction thereof, and limiting blocks are provided on the opposite side walls of the filter plate to be inserted into the corresponding limiting grooves.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. In the present invention, when the water in the foundation pit body enters the cavity, the driving assembly in the cavity drives the cleaning block on the movable plate to move back and forth in the corresponding filter tank, so that the cleaning block can scrape the filter tank. Compared with the existing one, this type of foundation pit drainage device is convenient for actual use and can avoid garbage adhering to the filter plate, resulting in poor effect of water in the foundation pit body entering the cavity, thereby affecting the pumping pipe to extract water in the foundation pit body.

[0017] 2. The utility model drives the cleaning block on the movable plate to slide out of the corresponding filter slot by installing the assembly. At this time, the filter plate is released from the opening of the cavity, so that the filter plate can slide out of the opening of the cavity from the slot. Then, the staff can clean the mud and sand in the cavity, thereby avoiding excessive mud and sand in the cavity after the box is used multiple times, thereby affecting the actual use of the water pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural schematic diagram of a foundation pit drainage device in the utility model.

[0019] Figure 2 It is a schematic diagram of the structure inside the box body of the utility model.

[0020] Figure 3 It is a schematic cross-sectional view of the installation components in the box body of the present invention.

[0021] Figure 4 It is a schematic diagram of the connection structure of the hinged rod in the utility model.

[0022] Figure 5 It is a schematic cross-sectional structural diagram of the telescopic rod in the utility model.

[0023] The meaning of each number in the figure is:

[0024] 1. Foundation pit body; 2. Water pump; 3. Pumping pipe; 100. Box body; 110. Filter plate; 111. Filter tank; 120. Waterproof motor;

[0025] 201, cavity; 202, protrusion; 203, notch; 210, movable plate; 211, cleaning block; 220, threaded rod; 230, drive plate; 240, telescopic rod; 250, rotating rod; 251, clamping block; 260, handle;

[0026] 300, threaded ring; 310, mounting plate; 320, circular plate; 330, hinged rod; 340, support;

[0027] 400, vertical pole; 410, plug pole; 420, limit block;

[0028] 500, mounting block; 501, mounting cavity; 510, mounting ring; 520, fixing plate; 521, fixing rod; 530, spring. DETAILED DESCRIPTION

[0029] In order to further understand the content of the present invention, the present invention is described in detail with reference to the accompanying drawings and embodiments. It should be understood that the embodiments are merely for explanation of the present invention and are not intended to limit the present invention.

[0030] The following is combined with Figure 1-Figure 5This embodiment is described in further detail.

[0031] like Figure 1 As shown, a device for foundation pit drainage in this embodiment includes a foundation pit body 1, a box body 100 is provided in the foundation pit body 1, a cavity 201 is provided on the front side of the box body 100, a slidable filter plate 110 is provided at the opening of the cavity 201, and a plurality of filter slots 111 communicating with the cavity 201 are provided on the filter plate 110 along its height direction. The filter slots 111 are used to filter the water entering the cavity 201, and a movable movable plate 210 is provided in the cavity 201. The movable plate 210 has corresponding positions at the filter slots 111. Each of them is provided with a cleaning block 211 with one end extending out of the filter tank 111. A driving component is also provided in the cavity 201 for driving the movable plate 210 to drive the cleaning block 211 to move up and down to scrape the filter tank 111. An installation component is also provided in the cavity 201. The installation component is used to drive the movable plate 210 to drive the cleaning block 211 to insert or slide out of the corresponding filter tank 111, thereby realizing the disassembly and assembly of the filter plate 110 at the opening of the cavity 201. A drainage mechanism for extracting water from the cavity 201 is also provided on the foundation pit body 1.

[0032] In this embodiment, the drainage mechanism includes a water pump 2 installed on the foundation pit body 1. The water pump 3 on the water pump 2 extends into the cavity 201. When the water in the foundation pit body 1 needs to be drained, the box body 100 is placed into the foundation pit body 1, so that the water in the foundation pit body 1 passes through the filter tank 111 and enters the cavity 201. The water pump 2 then pumps the water in the cavity 201 out through the water pump 3, thereby facilitating the drainage of the water in the foundation pit body 1.

[0033] When the water in the foundation pit body 1 passes through the filter plate 110 through the filter tank 111, the filter tank 111 can intercept the garbage in the water so that the garbage in the water is located outside the box body 100, thereby preventing the garbage from entering the cavity 201 and affecting the actual use of the water pump 2;

[0034] Among them, in order to prevent garbage in the water from adhering to the filter plate 110 when water passes through the filter plate 110 and enters the cavity 201, so that the filter tank 111 is blocked by garbage, the driving component in the cavity 201 drives the movable plate 210 to move up and down reciprocatingly, so that the cleaning block 211 fixedly mounted on the movable plate 210 can move back and forth as the movable plate 210 rises and falls. When the cleaning block 211 moves back and forth in the corresponding filter tank 111, the cleaning block 211 scrapes the filter tank 111. Compared with the existing one, this is convenient for the foundation pit drainage device in actual use. It can prevent garbage from adhering to the filter plate 110, resulting in the filter tank 111 being blocked by the attached garbage, thereby affecting the water extraction of the water in the foundation pit body 1 by the pumping pipe 3;

[0035] One end of the cleaning block 211 extends out of the filter tank 111 so that when the cleaning block 211 moves back and forth, the cleaning block 211 can scrape the garbage attached to the filter tank 111 to the two ends of the filter plate 110, thereby effectively preventing the garbage attached to the filter plate 110 from clogging the filter tank 111.

[0036] Among them, limiting grooves are provided on the opposite side walls of the cavity 201 along their length directions, and limiting blocks 420 that are inserted into the corresponding limiting grooves are fixedly installed on the opposite side walls of the filter plate 110. A notch 203 is provided on the side wall of the box body 100, and the filter plate 110 can insert the limiting blocks 420 into the corresponding limiting grooves through the notch 203, thereby realizing the sliding installation of the filter plate 110 at the opening of the cavity 201. When the side wall of the limiting block 420 abuts against the end wall of the limiting groove, the cleaning block 211 on the movable plate 210 can just be inserted into the corresponding filter groove 111. When the cleaning block 211 is inserted into the corresponding filter groove 111, the cleaning block 211 can limit the sliding filter plate 110, thereby realizing the fixed installation of the filter plate 110 at the opening of the cavity 201;

[0037] During actual use, there may be mud and sand in the foundation pit body 1, and the mud and sand will enter the cavity 201 through the filter groove 111. After the box body 100 has been used many times, mud and sand will accumulate in the cavity 201. Therefore, when the pumping pipe 3 completes the extraction of water from the foundation pit body 1, the staff needs to drive the movable plate 210 away from the filter plate 110 through the installation component, so that the cleaning block 211 slides out of the corresponding filter groove 111. At this time, the filter plate 110 is released from the opening of the cavity 201, so that the filter plate 110 can slide out of the opening of the cavity 201 from the slot 203. Then, the staff can clean the mud and sand in the cavity 201, thereby avoiding excessive mud and sand in the cavity 201 after the box body 100 has been used many times; wherein, the extending end of the pumping pipe 3 is provided with a filter screen for filtering mud and sand to prevent mud and sand from entering the water pump 2.

[0038] like Figure 1-5 As shown, in this embodiment, the opposite side walls of the cavity 201 are provided with protrusions 202, and a rotatable threaded rod 220 is provided in the cavity 201;

[0039] The driving assembly includes a driving plate 230 arranged in the cavity 201 and with both ends respectively engaged in the corresponding protrusions 202. The driving plate 230 is provided with a threaded ring 300 that is threadedly engaged with the rotating rod 250. Both ends of the driving plate 230 are provided with a retractable telescopic rod 240 with one end connected to the movable plate 210. The threaded rod 220 rotates to drive the threaded ring 300 to drive the driving plate 230 to rise and fall, so that the movable plate 210 drives the cleaning block 211 to scrape the filter tank 111.

[0040] In this embodiment, by configuring the protrusion 202, the threaded rod 220, the driving plate 230, the threaded ring 300 and the telescopic rod 240, the protrusion 202 is fixedly mounted on the side wall of the cavity 201 along the height direction of the cavity 201, and the threaded ring 300 is fixedly mounted on the driving plate 230. Since the threaded rod 220 is threaded through the threaded ring 300, when the threaded rod 220 rotates, the protrusion 202 is used to limit the two ends of the driving plate 230, so that the threaded rod 220 rotates and drives the threaded ring 300 to drive the driving plate 230 to move up and down. When the driving plate 230 moves up and down, the telescopic rod 240 can drive the movable plate 210 to move up and down, thereby realizing that the cleaning block 211 scrapes the filter tank 111.

[0041] The movable plate 210 is mounted on the driving plate 230 via a telescopic rod 240. When the mounting assembly drives the movable plate 210 away from the filter plate 110, causing the cleaning block 211 to slide out of the filter tank 111, the telescopic rod 240 can be extended and retracted as the movable plate 210 moves, thereby enabling the mounting assembly to drive the movable plate 210 to move.

[0042] In actual use, both ends of the threaded rod 220 are installed on the corresponding side walls of the cavity 201 through bearing seats to realize the rotatable installation of the threaded rod 220. A waterproof motor 120 (the existing technology) is fixedly installed on the upper end surface of the box body 100. The output shaft of the waterproof motor 120 is fixedly connected to the threaded rod 220, so that the waterproof motor 120 can drive the threaded rod 220 to rotate, and the reciprocating lifting of the driving plate 230 can drive the movable plate 210 to reciprocate, that is, the cleaning block 211 is reciprocated and lifted in the filter tank 111, and the filter tank 111 is continuously scraped.

[0043] like Figure 1-5 As shown, in this embodiment, the telescopic rod 240 includes a mounting block 500 provided on the driving plate 230, and a mounting cavity 501 with an opening at one end is provided in the mounting block 500, and a mounting ring 510 is provided at the opening of the mounting cavity 501, and a fixing plate 520 is provided in the mounting cavity 501, and a fixing rod 521 is provided on the fixing plate 520, one end of which passes through the mounting ring 510 and is connected to the movable plate 210, and a spring 530 is also provided in the mounting cavity 501 for pushing the fixing plate 520 to move toward the mounting ring 510.

[0044] In this embodiment, by setting the mounting block 500, the mounting cavity 501, the mounting ring 510, the fixing plate 520, the fixing rod 521 and the spring 530, the mounting block 500 is fixedly mounted on the driving plate 230, the mounting ring 510 is threadedly mounted on the opening in the mounting cavity 501, and the fixing plate 520 is intercepted in the mounting cavity 501, so that the fixing plate 520 is installed in the mounting cavity 501. At the same time, the spring 530 can also be installed in the mounting cavity 501, and one end of the fixing rod 521 is fixedly mounted on the fixing plate 520. The other end of the fixing rod 521 is fixedly mounted on the movable plate 210, so that the movable plate 210 is mounted on the driving plate 230. When the spring 530 in the mounting cavity 501 pushes the fixing plate 520 toward the mounting ring 510, the fixing plate 520 can drive the movable plate 210 toward the filter plate 110 via the fixing rod 521, thereby ensuring that the cleaning block 211 on the movable plate 210 is always located in the corresponding filter slot 111 and limiting the position of the filter plate 110 at the opening of the cavity 201, thereby fixing the filter plate 110 at the opening of the cavity 201.

[0045] In actual use, when the installation component drives the movable plate 210 away from the filter plate 110, the movable plate 210 drives the fixed plate 520 through the fixed rod 521 to compress the spring 530 in the installation cavity 501, so that the installation component can drive the cleaning block 211 on the movable plate 210 to slide out of the corresponding filter slot 111, thereby releasing the filter plate 110 from being fixed at the opening of the cavity 201.

[0046] like Figure 1-4 As shown, in this embodiment, a support 340 is provided on the movable plate 210, a mounting plate 310 is provided on the driving plate 230, a rotating rod 250 is rotatable in the cavity 201, and opposite clamping blocks 251 are provided on the side walls of the rotating rod 250 along its height direction;

[0047] The mounting assembly includes a circular plate 320 which is arranged on the mounting plate 310 and for the rotating rod 250 to pass through. The circular plate 320 can be rotatably set. A card slot for the corresponding card block 251 to be inserted is provided on the circular plate 320. A hinged rod 330 is provided between the circular plate 320 and the support 340. The two ends of the hinged rod 330 are respectively hingedly connected to the circular plate 320 and the support 340. The rotation of the rotating rod 250 is used to drive the circular plate 320 to rotate, so that the cleaning block 211 on the movable plate 210 can slide out of the filter tank 111.

[0048] In this embodiment, the support 340 is fixedly mounted on the movable plate 210, the mounting plate 310 is fixedly mounted on the driving plate 230, the circular plate 320 is rotatably mounted on the mounting plate 310 via a bearing seat, and the block 251 is fixedly mounted on the rotating rod 250. When the rotating rod 250 rotates, the block 251 can drive the circular plate 320 to rotate. The rotation of the circular plate 320 can drive the support 340 to move closer to the driving plate 230 via the hinged rod 330, thereby realizing that the movable plate 210 starts to move away from the filter plate 110 and the cleaning block 211 slides out of the corresponding filter tank 111.

[0049] One end of the rotating rod 250 extends out of the box body 100, and a handle 260 is fixedly installed on the extended end of the rotating rod 250 for driving the rotating rod 250 to rotate. The staff can drive the rotating rod 250 to rotate through the handle 260 outside the box body 100, thereby releasing the filter plate 110 from being fixed at the opening of the cavity 201;

[0050] Among them, a vertical rod 400 is fixedly installed on the upper end surface of the circular plate 320 near the edge, one end of the hinged rod 330 is mounted on the vertical rod 400 through a bearing seat, and an insertion rod 410 with one end passing through the other end of the hinged rod 330 is installed on the support 340, so that the hinged rod 330 is installed between the circular plate 320 and the support 340. When the circular plate 320 rotates, the vertical rod 400 rotates along the circumference of the circular plate 320. The rotation of the vertical rod 400 can drive the cleaning block 211 on the movable plate 210 to slide out of the filter tank 111 through the hinged rod 330, thereby releasing the fixation of the filter plate 110 at the opening of the cavity 201.

[0051] Working principle: First, when the water in the foundation pit body 1 needs to be discharged, the box body 100 is placed in the foundation pit body 1, so that the water in the foundation pit body 1 passes through the filter tank 111 and enters the cavity 201. The water pump 2 extracts the water in the cavity 201 through the pumping pipe 3 to realize the discharge of the water in the foundation pit. When the water in the foundation pit body 1 passes through the filter tank 111 and the filter plate 110, the filter tank 111 can intercept the garbage in the water. At the same time, the waterproof motor 120 drives the threaded rod 220 to rotate, and the threaded rod 220 rotates to drive the threaded ring 300 to drive the driving plate 230 to rise and fall in the cavity 201. The lifting of the driving plate 230 can drive the moving plate 210 through the telescopic rod 240. The cleaning block 211 is lifted and lowered to scrape the garbage blocked in the filter tank 111. When all the water in the foundation pit body 1 is drained, the waterproof motor 120 is turned off first, and the rotating rod 250 is driven to rotate by the handle 260, so that the rotating rod 250 drives the circular plate 320 to rotate. The rotation of the circular plate 320 drives the hinged rod 330 through the vertical rod 400 to drive the support 340 to approach the driving plate 230, so that the movable plate 210 drives the cleaning block 211 to slide out of the filter tank 111. At this time, the staff slides the filter plate 110 out of the slot 203, releases the installation of the filter plate 110 at the opening of the cavity 201, and finally, the staff cleans the mud and sand in the cavity 201.

Claims

1. A device for facilitating foundation pit drainage, comprising a foundation pit body (1), characterized in that: A box body (100) is provided in the foundation pit body (1), a cavity (201) is provided on the front side of the box body (100), a slidable filter plate (110) is provided at the opening of the cavity (201), a plurality of filter grooves (111) communicating with the cavity (201) are provided on the filter plate (110) along its height direction, the filter grooves (111) are used to filter water entering the cavity (201), a movable movable plate (210) is provided in the cavity (201), and one end of the movable plate (210) is extended out of the filter groove (111) at the corresponding position of the filter groove (111). 1) a cleaning block (211) outside the cavity (201), a driving assembly for driving the movable plate (210) to drive the cleaning block (211) to move up and down to scrape the filter tank (111), a mounting assembly is also provided in the cavity (201), the mounting assembly is used to drive the movable plate (210) to drive the cleaning block (211) to insert into or slide out of the corresponding filter tank (111), and realize the disassembly and assembly of the filter plate (110) at the opening of the cavity (201), and a drainage mechanism for extracting water from the cavity (201) is also provided on the foundation pit body (1).

2. The device for facilitating foundation pit drainage according to claim 1, characterized in that: The opposite side walls of the cavity (201) are each provided with a protrusion (202), and a rotatable threaded rod (220) is provided in the cavity (201); The driving assembly comprises a driving plate (230) which is arranged in the cavity (201) and has two ends respectively engaged in corresponding protrusions (202); a threaded ring (300) is provided on the driving plate (230) and is threadably matched with the rotating rod (250); a telescopic rod (240) is provided at each end of the driving plate (230), one end of which is connected to the movable plate (210); the threaded rod (220) is rotated to drive the threaded ring (300) to drive the driving plate (230) to move up and down, so that the movable plate (210) drives the cleaning block (211) to scrape the filter tank (111).

3. The device for facilitating foundation pit drainage according to claim 2, characterized in that: The telescopic rod (240) includes a mounting block (500) disposed on the driving plate (230), a mounting cavity (501) with an opening at one end being disposed in the mounting block (500), a mounting ring (510) being disposed at the opening of the mounting cavity (501), a fixing plate (520) being disposed in the mounting cavity (501), a fixing rod (521) being disposed on the fixing plate (520) with one end penetrating the mounting ring (510) and connected to the movable plate (210), and a spring (530) being disposed in the mounting cavity (501) for pushing the fixing plate (520) toward the mounting ring (510).

4. The device for facilitating foundation pit drainage according to claim 3, characterized in that: A support (340) is provided on the movable plate (210), a mounting plate (310) is provided on the driving plate (230), a rotating rod (250) is rotatable in the cavity (201), and opposing clamping blocks (251) are provided on the side walls of the rotating rod (250) along its height direction; The mounting assembly comprises a circular plate (320) which is arranged on the mounting plate (310) and through which the rotating rod (250) passes. The circular plate (320) is rotatably arranged. A slot for a corresponding card block (251) to be inserted is provided on the circular plate (320). A hinged rod (330) is provided between the circular plate (320) and the support (340). Both ends of the hinged rod (330) are hingedly connected to the circular plate (320) and the support (340), respectively. The rotating rod (250) is rotated to drive the circular plate (320) to rotate, thereby enabling the cleaning block (211) on the movable plate (210) to slide out of the filter tank (111).

5. The device for facilitating foundation pit drainage according to claim 4, characterized in that: A vertical rod (400) is provided on the upper end surface of the circular plate (320) near the edge, one end of the hinged rod (330) is sleeved on the vertical rod (400), and an insertion rod (410) is provided on the support (340) with one end penetrating the other end of the hinged rod (330).

6. The device for facilitating foundation pit drainage according to claim 4, characterized in that: One end of the rotating rod (250) is extended out of the box body (100), and the extended end of the rotating rod (250) is provided with a handle (260) for driving the rotating rod (250) to rotate.

7. The device for facilitating foundation pit drainage according to claim 4, characterized in that: Limiting grooves are provided on the opposite side walls of the cavity (201) along their length direction, and limiting blocks (420) are provided on the opposite side walls of the filter plate (110) to be inserted into the corresponding limiting grooves.

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