Underground water filtering device for foundation pit recharge and use method of underground water filtering device

Abstract

The invention is suitable for the technical field of underground water treatment and recharge in the civil engineering field, and particularly relates to an underground water filtering device for foundation pit recharge and a using method thereof, the underground water filtering device comprises a filtering box body, the top end of the filtering box body is of an opening structure, and the bottom end of the filtering box body is of a sealing structure; a precipitation shunting assembly is arranged in the filtering box body; the precipitation and diversion assembly comprises a bottom bearing partition plate, and the bottom bearing partition plate is arranged on the inner wall of the filtering box body. According to the invention, by constructing a multi-stage filtering path combining the precipitation diversion assembly and the drawer type filter element structure, ordered diversion and graded adsorption filtering of underground water after zoned precipitation are realized for the first time. The filter element drawing frame is provided with a detachable structure, so that replacement and maintenance are convenient, and the operation and maintenance cost is remarkably reduced. The settling area adopts a vertical subdivision turbulent flow design, so that the retention time of a water body is effectively prolonged, the settling efficiency is improved, and large particles are ensured to enter water guide gaps after being fully settled.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of groundwater treatment and recharge in the field of civil engineering, in particular to a groundwater filtering device for foundation pit recharge and a use method thereof. BACKGROUND

[0002] In the field of civil engineering, a large amount of groundwater pumping operation is often involved in the process of foundation pit construction, especially in the super deep foundation pit engineering using suspended water stop curtain, because the curtain structure does not completely cut into the impermeable layer, resulting in continuous seepage of groundwater outside the pit into the pit. In order to ensure the safety of the foundation pit and the stability of the ground surface, the water level needs to be controlled through the dewatering operation, and the water quantity needs to be supplemented through the recharge method after the dewatering is completed, so as to maintain the dynamic balance of the aquifer. The current engineering generally adopts the combination of temporary water storage sedimentation tank and single-stage simple filter equipment to treat the pumped groundwater before introducing it into the recharge well. This kind of treatment method has simple equipment, low cost, and is suitable for regional engineering with low water quality requirements.

[0003] However, with the improvement of the safety of recharge water quality and the standard of groundwater pollution prevention and control, the existing technology has exposed many problems in practical application: first, the existing sedimentation means is mostly open water storage tank, the sedimentation path is short, the water flow is turbulent, and the heavy particles cannot be fully settled, resulting in easy clogging of the subsequent filter core; second, most of the filter devices use fixed filter core structure, which is not convenient to replace, has low maintenance efficiency and high cost; third, the filter core structure is single, lacks on-demand combination and multi-stage filtering capacity, and cannot realize layered treatment of different impurities, so the water quality treatment effect is limited; fourth, some devices do not dynamically monitor the water quality, which has the risk of not responding in time when the water quality fluctuates. SUMMARY

[0004] The purpose of the embodiment of the present application is to provide a groundwater filtering device for foundation pit recharge and a use method thereof, which aims to solve the technical problems mentioned in the background.

[0005] In order to achieve the above-mentioned purpose, the present application provides the following technical scheme: A groundwater filtering device for foundation pit recharge, comprising a filter box body, the top end of the filter box body is an open structure, and the bottom end is a sealed structure; The inside of the filter box body is provided with a sedimentation and shunt assembly; The sedimentation and shunt assembly comprises a bottom supporting partition plate, the bottom supporting partition plate is arranged on the inner wall of the filter box body, a water guiding gap is arranged between the bottom supporting partition plate and the filter box body, the surface of the bottom supporting partition plate is connected with a first flow guiding partition plate and a second flow guiding partition plate, and the surface of the first flow guiding partition plate and the second flow guiding partition plate is respectively provided with a first sedimentation zone water outlet and a second sedimentation zone water outlet; The inside of the filter box is sequentially provided with two groups of drawer type water filtering channels from top to bottom, and the two groups of drawer type water filtering channels are located below the sediment separation component. The inner bottom of the filter box is provided with a plurality of drainage openings.

[0006] As a further description of the above technical solution: the water guide gap is formed by the gap between one group of side edges of the bottom support partition plate and the inner wall of the filter box.

[0007] As a further description of the above technical solution: the first flow guide partition plate and the second flow guide partition plate are arranged perpendicular to each other.

[0008] As a further description of the above technical solution: the water guide gap is provided with a filter screen.

[0009] As a further description of the above technical solution: the drawer type water filtering channel comprises a filter core pulling frame, the filter core pulling frame is horizontally inserted into the drawer opening formed in the side wall of the filter box and inserted into the inside of the filter box. The filter core pulling frame is a hollow structure, and the upper and lower sides of the filter core pulling frame are respectively provided with an upper filter screen and a lower filter screen, and the hollow area of the filter core pulling frame is filled with a filter core.

[0010] As a further description of the above technical solution: the side of the filter core pulling frame adjacent to the drawer opening protrudes from the outer wall of the filter box by a certain distance, and the protruding part is provided with an anti-skid holding block or a pull hole.

[0011] As a further description of the above technical solution: the inner wall of the filter box is provided with positioning slots matched with the other three groups of side edges of the filter core pulling frame.

[0012] As a further description of the above technical solution: in the two groups of drawer type water filtering channels, the filter core material at one group of drawer type water filtering channels adopts activated carbon, and the filter core material at the other group of drawer type water filtering channels adopts zeolite.

[0013] As a further description of the above technical solution: a pH value measurer is installed at the position close to the drainage opening on the outer side of the filter box.

[0014] The application also discloses a use method of the underground water filtering device for foundation pit recharge. S1: connecting the water pumping assembly to the top opening structure of the filter box, and pumping the underground water to be treated in the foundation pit into the inside of the filter box through the water pumping assembly; S2: the groundwater is discharged into the cavity region outside the first flow guide baffle and the second flow guide baffle in the sedimentation shunt assembly, in the region, the water body is guided to the first sedimentation zone water outlet and the second sedimentation zone water outlet, and then enters the vertical partitioned sedimentation structure formed by the first flow guide baffle and the second flow guide baffle, and flow disturbance and particle sedimentation are completed inside; S3: after the groundwater completes sedimentation in the sedimentation zone, the groundwater is discharged through the first sedimentation zone water outlet and the second sedimentation zone water outlet, and is introduced into the water guide gap formed between the bottom support baffle and the filter box; S4: the water body is subjected to primary filtration through the filter screen at the water guide gap, so as to remove the large impurity particles remaining after sedimentation; S5: the groundwater subjected to primary filtration is guided to flow through two groups of drawer type water filtering channels in sequence, the filter core drawer frame is arranged in each of the two groups of drawer type water filtering channels, the water body passes through the upper filter screen, the hollow structure filled with the filter core and the lower filter screen in sequence in the filter core drawer frame, and multi-stage filtration treatment is completed; S6: the water body subjected to the multi-stage filtration treatment is introduced into the bottom of the filter box, and is discharged through the drain; S7: the pH value detector arranged in the filter box is used for detecting the pH value of the discharged water body, whether the water quality after treatment meets the requirements of recharge is judged, and if yes, the water body is introduced into the recharge well to complete the underground recharge operation.

[0015] In the above technical solution, the beneficial effects of the present application are as follows: The present application realizes the orderly water guiding and the multi-stage adsorption filtration of the groundwater after the partitioned sedimentation by constructing the multi-stage filtration path combining the sedimentation shunt assembly and the drawer type filter core structure. The filter core drawer frame has a detachable structure, is convenient to replace and maintain, and significantly reduces the operation and maintenance cost. The sedimentation zone adopts the vertical partitioned disturbance flow design, effectively prolongs the water body residence time, improves the sedimentation efficiency, and ensures that the large particles are fully settled before entering the water guide gap. The two groups of water filtering channels can flexibly configure the zeolite and activated carbon filter core according to the water quality requirements, and realize the collaborative purification of ionic impurities and organic pollution. The device has compact structure and strong adaptability, and is suitable for on-site application in the whole process of foundation pit recharge.

[0016] It should be understood that the foregoing general description and the following detailed description are merely exemplary and explanatory, rather than limiting the present disclosure.

[0017] The present application file provides an overview of various implementations or examples of the technology described in the present disclosure, and is not a comprehensive disclosure of the full scope or all features of the disclosed technology. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art based on these drawings.

[0019] Fig. 1 It is a structural schematic diagram of the present application.

[0020] Fig. 2 It is a structural schematic diagram of the sediment separation assembly of the present application.

[0021] Fig. 3 It is a structural schematic diagram of the drawer type water filtering channel of the present application.

[0022] In the figure: 1, filter box; 2, sediment separation assembly; 21, first sedimentation zone water outlet; 22, second sedimentation zone water outlet; 23, first flow guide partition; 24, second flow guide partition; 25, bottom support partition; 3, filter screen; 4, drawer type water filtering channel; 41, filter core pulling frame; 42, upper filter screen; 43, filter core; 44, lower filter screen; 5, water outlet. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be described clearly and completely below in combination with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present disclosure.

[0024] Please refer to Figs. 1-3 The present embodiment provides a groundwater filtering device for foundation pit recharge, which comprises a filter box 1, the top end of the filter box 1 is an open structure, and the bottom end is a sealed structure; The filter box 1 is internally provided with a sediment separation assembly 2; The sediment separation assembly 2 comprises a bottom support partition 25, which is arranged on the inner wall of the filter box 1, and a water guide gap is arranged between the bottom support partition 25 and the filter box 1, the water guide gap is formed by the gap reserved between one group of side edges of the bottom support partition 25 and the inner wall of the filter box 1, and a filter screen 3 is arranged at the water guide gap; The surface of the bottom supporting partition plate 25 is connected with a first flow guide partition plate 23 and a second flow guide partition plate 24, the first flow guide partition plate 23 and the second flow guide partition plate 24 are arranged perpendicularly to each other, and the surface of the first flow guide partition plate 23 and the second flow guide partition plate 24 is respectively provided with a first sedimentation zone water outlet 21 and a second sedimentation zone water outlet 22; The inside of the filter box 1 is sequentially provided from top to bottom with two groups of drawer type water filtering channels 4, and the two groups of drawer type water filtering channels 4 are located below the sedimentation and shunting assembly 2 and are respectively used for realizing multi-stage filtering treatment of the water body, the drawer type water filtering channel 4 comprises a filter core pulling frame 41, the filter core pulling frame 41 is horizontally inserted into the drawer opening provided on the side wall of the filter box 1 and inserted into the inside of the filter box 1. The filter core pulling frame 41 is a hollow structure, and the upper and lower sides of the filter core pulling frame 41 are respectively provided with an upper layer filter screen 42 and a lower layer filter screen 44, and the hollow area of the filter core pulling frame 41 is filled with filter core 43 material. In the two groups of drawer type water filtering channels 4, the filter core 43 material at one of the two groups of drawer type water filtering channels 4 adopts activated carbon, and the filter core 43 material at the other group of drawer type water filtering channels 4 adopts zeolite. If the filter core 43 material at the upper drawer type water filtering channel 4 adopts zeolite, then the filter core 43 material at the lower drawer type water filtering channel 4 adopts activated carbon, and if the filter core 43 material at the upper drawer type water filtering channel 4 adopts activated carbon, then the filter core 43 material at the lower drawer type water filtering channel 4 adopts zeolite. The filter core 43 materials at the upper and lower positions can be flexibly changed to adapt to different strata or underground water composition conditions.

[0025] The filter core 43 material 4 selects zeolite, which can be used for preferentially adsorbing calcium, magnesium and other ions and suspended particles, and the filter core 43 material 4 selects activated carbon, which is used for removing residual organic matter, peculiar smell and part of soluble gas.

[0026] The water body filtered through the two groups of drawer type water filtering channels 4 flows into the bottom of the filter box 1 and is guided to be discharged through a plurality of drainage openings 5 provided at the inner bottom of the filter box 1 (a pump and a hose can be used in cooperation), which is used for subsequent recharge operation. The structure can ensure that the discharged water body reaches the safety recharge standard after sedimentation and multi-stage filtering, so as to avoid secondary pollution.

[0027] The embodiment prolongs the water body residence path through the sedimentation and shunting assembly 2 and classifies and adsorbs and intercepts different types and particle sizes of impurities in the water body in combination with the upper and lower two groups of drawer type water filtering channels 4, the overall structure is simple, the assembly is convenient, the filter core assembly is easy to replace, the filter core maintenance can be realized without disassembling the filter box, the problems of complex filter core replacement and insufficient water body treatment in the prior art are effectively solved, and the adaptability, engineering feasibility and water quality guarantee capability of the pre-treatment process of the underground water recharge are improved.

[0028] The present application is suitable for the groundwater recharge scene caused by dewatering operation in the process of ultra-deep foundation pit construction. Due to the use of suspended water stop curtain in the foundation pit, the seepage of groundwater outside the pit cannot be completely blocked, resulting in continuous pumping operation in the pit. If the groundwater is directly recharged without sufficient treatment, it will easily lead to the pollution of groundwater aquifer and the destruction of stratum structure by the sand, particles or soluble pollutants carried in the recharged water, and seriously affect the recharging effect. Therefore, a filtering device with simple structure, replaceable filter element, clear filtering path and stable filtering effect is needed to carry out sedimentation and staged filtration treatment on the extracted groundwater to meet the recharging requirements of Class III water in the "Groundwater Quality Standard".

[0029] In use, the water pumping assembly is connected to the top opening of the filter box 1 to pump the groundwater to be treated into the filter box 1. The water entering the filter box 1 does not directly flow into the water guiding gap, but is guided into the sedimentation area between the first and second flow guiding baffles 23 and 24. The area is a closed partition structure, which is isolated from the water guiding gap by the bottom supporting baffle 25.

[0030] The water pumping assembly can be a submersible pump, a self-priming pump, an electric diaphragm pump or an engineering water pump unit, the outlet end of which is connected to the top opening of the filter box 1 through a hose or a pipeline for stably conveying the groundwater pumped from the foundation pit into the sedimentation and diversion assembly 2.

[0031] The water stays in the sedimentation area and forms path disturbance under the guidance of the first and second flow guiding baffles 23 and 24, thereby prolonging the residence time and promoting the sedimentation of sand and larger particles. The sedimented water is led out only through the first and second sedimentation area outlets 21 and 22, which are located on the side close to the bottom supporting baffle 25 and correspond to the side of the baffle 25 not attached. The side and the inner wall of the filter box 1 form a water guiding gap, and a filter screen 3 is arranged in the water guiding gap. The water discharged through 21 and 22 flows into the water guiding gap and is preliminarily filtered through the filter screen 3 before entering the drawer type water filtering channel 4 below.

[0032] The structure ensures that the pumped groundwater first completes sand sedimentation in the closed sedimentation area and cannot directly flow into the water guiding gap, effectively avoiding a large amount of suspended impurities in the water without sedimentation from entering the subsequent filtering link, thereby improving the sedimentation efficiency and guaranteeing the service life of the filter element and the overall treatment effect.

[0033] In this embodiment, the first and second flow guiding baffles 23 and 24 are arranged perpendicular to each other. This structure can divide the sedimentation area into multiple water flow channels separated from each other, effectively changing the flow direction and velocity distribution of the water in the sedimentation and diversion assembly 2, thereby forming an interlaced disturbance path and prolonging the residence time of the water in the sedimentation area.

[0034] By setting the mutually perpendicular flow guide partition plates, the water body needs to change the direction and path at least once in the sedimentation area, which helps to promote the suspended matter to settle to the bottom due to the inertia weakening and gravity in the flow process. In addition, this compartmentalized flow interference structure can also weaken the straight flow phenomenon caused by too fast water inflow, further preventing the water body without sedimentation from bypassing the sedimentation process and directly entering the subsequent filtration link.

[0035] The design structure is simple and compact in volume, but significantly improves the water sedimentation efficiency in a limited space, which is an important auxiliary structure for improving the reliability of the pre-treatment stage.

[0036] In the further provided embodiment of the application, the filter core pulling frame 41 protrudes 5-15 cm from the outer wall 5 of the filter box 1 on the side adjacent to the drawer opening, and the protruding part is provided with anti-skid holding blocks or pull holes. This structure facilitates the operator to quickly pull out the filter core pulling frame 41 from the insertion hole in the maintenance process by hand gripping or tool hooking, and realizes the replacement or inspection operation of the filter core assembly. The protruding part avoids the difficulty of taking out caused by the complete flush of the filter core pulling frame 41 with the drawer opening, especially in the wet and slippery, high-frequency disassembly or limited space environment, which can significantly improve the operation convenience. The anti-skid holding block can increase the contact area of the fingertips and improve the gripping stability, while the pull hole can be used for hooking to assist in pulling out, meeting the replacement requirements in different working conditions. Through the introduction of this structure, the maintenance time extension or human damage caused by the jamming and inconvenient operation of the filter core pulling frame 41 can be reduced, which helps to improve the use frequency and maintainability of the filter core pulling frame 41 and enhances the overall engineering practicability of the device.

[0037] As a further description of the above technical solution: the inner wall of the filter box 1 is provided with three other groups of positioning slots adapted to the upper three side edges of the filter core pulling frame 41. The positioning slots are used for limiting and guiding the filter core pulling frame 41, providing a stable assembly position when it is in the filter box 1, preventing the filter core pulling frame 41 from being skewed, shaken or misaligned during use, and the thickness of the positioning slots is also adapted to the filter core pulling frame 41, so that after the filter core pulling frame 41 is accurately slid into the positioning slots along the preset direction, it can ensure that the upper and lower upper filter screens 42 and lower filter screens 44 are tightly fitted with the filter core 43, avoiding the bypass flow of water or the loose contact with the filter core 43. This structure also improves the assembly consistency, so that the filter core 43 can still maintain good sealing performance and filtration efficiency after being disassembled and assembled multiple times.

[0038] The positioning slot structure is simple, easy to mold and mass produce, and can significantly improve the installation reliability of the filter core assembly, which is one of the important support designs to ensure the stability of the filtration effect.

[0039] In the embodiment, a pH value measuring device 6 is arranged on the outer side of the filter box 1 close to the water outlet 5. The pH value measuring device 6 is used to monitor the pH value of the groundwater after the precipitation and multi-stage filtration treatment in real time, so as to determine whether the water body reaches the safe recharge standard. The pH value measuring device 6 is arranged close to the water outlet 5, so that the final water quality can be detected in real time, and the representativeness and accuracy of the measurement results are ensured. At the same time, the arrangement at this position facilitates the dynamic evaluation of the water body before recharge. If abnormal conditions such as failure or contamination of the filter element 43 occur, a warning signal can be sent in time, so that the operation and maintenance personnel can adjust the configuration of the filter element 43 or interrupt the water supply. The measuring device has a compact structure and a sensitive response, and can effectively assist the filtration system to establish a water quality closed-loop control mechanism, thereby further improving the water quality guarantee capability and intelligent level of the application in actual projects.

[0040] The embodiment also discloses a use method of the groundwater filtration device for foundation pit recharge. S1: connecting the water pumping assembly to the top opening structure of the filter box 1, and pumping the groundwater to be treated in the foundation pit into the filter box 1 through the water pumping assembly; S2: discharging the groundwater into the cavity region outside the first flow guide partition plate 23 and the second flow guide partition plate 24 of the sedimentation and distribution assembly 2, guiding the water body to the first sedimentation area water outlet 21 and the second sedimentation area water outlet 22 in the region, and then introducing the water body into the vertical partitioned sedimentation structure formed by the first flow guide partition plate 23 and the second flow guide partition plate 24 to complete flow disturbance and particle sedimentation in the interior; S3: after the groundwater completes the sedimentation in the sedimentation area, discharging the groundwater through the first sedimentation area water outlet 21 and the second sedimentation area water outlet 22, and introducing the groundwater into the water guide gap formed between the bottom support partition plate 25 and the filter box 1; S4: making the water body pass through the filter screen 3 at the water guide gap to remove the residual large impurity particles after the sedimentation; S5: guiding the groundwater after the primary filtration to flow through the two groups of drawer type water filtration channels 4 in sequence, the two groups of drawer type water filtration channels 4 being respectively provided with the filter element pulling frame 41, the water body passing through the upper filter screen 42, the hollow structure filled with the filter element 43 and the lower filter screen 44 in the filter element pulling frame 41 in sequence to complete the multi-stage filtration treatment, wherein the filter element 43 includes two configuration modes of zeolite and activated carbon, and is arranged in the upper and lower water filtration channels 4 respectively to realize the graded adsorption filtration of different impurities; S6: introducing the water body after the multi-stage filtration treatment into the bottom of the filter box 1, and discharging the water body through the water outlet 5; S7: The pH value of the discharged water body is detected by the pH value detector 6 arranged inside the filter box 1, whether the water quality after treatment meets the recharge requirements is judged, and if it meets the requirements, the water body is introduced into the recharge well to complete the underground recharge operation.

[0041] In this embodiment, the use method of the underground water filtering device is suitable for the recharge treatment scene of underground water generated in the foundation pit dewatering operation, especially suitable for the use of suspended water curtain structure in super deep foundation pit engineering. Because the underground water seepage outside the pit cannot be completely isolated, continuous dewatering causes the risk of surface subsidence, and recharge is needed to maintain the dynamic balance of underground water. The use method realizes the whole process treatment of underground water from extraction to sedimentation, from primary filtration to staged adsorption, and then to water quality detection and safe recharge through the structured filtration process, effectively ensuring the stability and safety of the recharge water quality.

[0042] In the S1 step, the introduction of underground water is completed by connecting the water pumping assembly to the top opening structure of the filter box 1. The opening structure provides a quick water supply interface for the device, which is suitable for various engineering water pumping equipment, so that the water to be treated can be efficiently transported to the filter unit.

[0043] In the S2 step, the underground water first enters the cavity area outside the first and second flow guide baffles 23 and 24 in the sedimentation and distribution assembly 2, which serves as a temporary storage area for controlling the water inflow and preliminary directional flow. Then, the water is introduced into the vertical partition structure composed of the first and second flow guide baffles 23 and 24 through the first and second sedimentation area outlets 21 and 22. This structure design is used to disturb the water flow path and prolong the residence time, so that the suspended particles, silt and other impurities in the water can fully settle under the action of gravity.

[0044] In the S3 step, the water treated by sedimentation is discharged through the first and second sedimentation area outlets 21 and 22 and introduced into the water guide gap between the bottom support baffle 25 and the filter box 1. This gap is a transition channel for the water before flowing to the filter core, ensuring that the water after sedimentation flows into the filter area in one direction, avoiding the direct passage of un-settled impurities through the filter device, affecting the service life and filtering precision of the filter core.

[0045] In the S4 step, the water is preliminarily filtered by the filter screen 3 arranged at the water guide gap, further removing the remaining large particle impurities after sedimentation, and providing a more pure water inflow condition for subsequent filter core adsorption filtration.

[0046] In the S5 step, the primary filtered water body flows through two groups of drawer type water filtering channels 4 in turn. A filter core drawer frame 41 is arranged in each group of water filtering channels, and the filter core assembly has a drawable structure, facilitating replacement and maintenance. The water body passes through the upper filter screen 42, the hollow structure filled with filter core material 43 and the lower filter screen 44 in the filter core drawer frame 41 in turn, completing multi-stage adsorption and filtration treatment of microparticles, ions, organic impurities and the like. The filter core material 43 can be selected in different combinations of zeolite and activated carbon, respectively removing metal ions, particulate impurities, odors and dissolved gases, so as to achieve more detailed and layered water quality purification goals.

[0047] In the S6 step, the water body that has passed through the complete filtration process is introduced into the bottom of the filter box 1, and finally discharged through the water outlet 5, forming a continuous and stable water outlet path, facilitating subsequent unified delivery to the recharge system.

[0048] In the S7 step, a pH value measurer 6 is installed inside the filter box 1, for real-time detection of the pH value index of the discharged water body. Through the detection device, it can be assessed in time whether the water quality meets the recharge standard. If the water quality is qualified, the treated water body is introduced into the recharge well through the external pipeline, realizing the artificial water replenishment process of the underground aquifer, avoiding the imbalance of the underground water level caused by continuous pumping, and ensuring the controllability of the ground surface settlement during and after the foundation pit construction.

[0049] In summary, the use method fully embodies the engineering adaptability and water quality control ability of the filter device in the foundation pit recharge scene, and realizes the efficient, safe and maintainable underground water filtration technical path from the source water inlet to the end recharge process, combined with the structure design of sedimentation + multi-stage filter core filtration + pH monitoring, and has good engineering popularization value.

[0050] The above only describes certain exemplary embodiments of the present application by way of illustration, without doubt, for ordinary skilled in the art, without departing from the spirit and scope of the present application, the described embodiments can be modified in various ways. Therefore, the above figures and description are illustrative in nature and should not be construed as limiting the scope of the claims of the present application.

Claims

1. A groundwater filtration device for foundation pit recharge, comprising a filter housing (1), characterized in that, The top of the filter box (1) is an open structure, and the bottom is a sealed structure; The filter housing (1) is equipped with a sedimentation diversion component (2). The sedimentation and diversion assembly (2) includes a bottom support partition (25), which is disposed on the inner wall of the filter box (1). A water guiding gap is provided between the bottom support partition (25) and the filter box (1). A first flow guiding partition (23) and a second flow guiding partition (24) are connected to the surface of the bottom support partition (25). The surfaces of the first flow guiding partition (23) and the second flow guiding partition (24) are respectively provided with a first sedimentation zone outlet (21) and a second sedimentation zone outlet (22). The filter box (1) has two sets of drawer-type water filtration channels (4) arranged from top to bottom inside, and both sets of drawer-type water filtration channels (4) are located below the sedimentation and diversion assembly (2); The bottom of the filter box (1) is provided with several drain outlets (5).

2. The groundwater filtration device for foundation pit recharge according to claim 1, characterized in that, The water guide gap is formed by the gap between one set of sides of the bottom supporting partition (25) and the inner wall of the filter box (1).

3. A groundwater filtration device for foundation pit recharge according to claim 1, characterized in that, The first flow guide baffle (23) and the second flow guide baffle (24) are arranged perpendicular to each other.

4. A groundwater filtration device for foundation pit recharge according to claim 2, characterized in that, A filter screen (3) is provided at the water guide gap.

5. A groundwater filtration device for foundation pit recharge according to claim 1, characterized in that, The drawer-type water filtration channel (4) includes a filter element pull-out frame (41), which is horizontally inserted into the drawer opening on the side wall of the filter box (1) and inserted into the interior of the filter box (1). The filter element pull-out frame (41) has a hollow structure, and the upper and lower sides of the filter element pull-out frame (41) are respectively provided with an upper filter screen (42) and a lower filter screen (44), and the hollow area of ​​the filter element pull-out frame (41) is filled with a filter element (43).

6. A groundwater filtration device for foundation pit recharge according to claim 5, characterized in that, The side of the filter cartridge pull-out frame (41) adjacent to the drawer opening protrudes 5-15 cm from the outer wall of the filter box (1), and its protruding part is provided with anti-slip grip blocks or pull holes.

7. A groundwater filtration device for foundation pit recharge according to claim 6, characterized in that, The inner wall of the filter box (1) is provided with positioning slots that are compatible with the other three sets of sides on the filter element pull-out frame (41).

8. A groundwater filtration device for foundation pit recharge according to claim 5, characterized in that, In the two sets of drawer-type water filtration channels (4), the filter element (43) material in one set of drawer-type water filtration channels (4) is activated carbon, and the filter element (43) material in the other set of drawer-type water filtration channels (4) is zeolite.

9. A groundwater filtration device for foundation pit recharge according to claim 1, characterized in that, A pH meter (6) is installed on the outside of the filter box (1) near the drain outlet (5).

10. A method of using a groundwater filtration device for foundation pit recharge according to any one of claims 1-9, characterized in that, The method includes the following steps: S1: Connect the pumping assembly to the top opening structure of the filter box (1) and pump the groundwater to be treated in the pit into the filter box (1) through the pumping assembly. S2: The groundwater is discharged into the cavity area outside the first guide baffle (23) and the second guide baffle (24) in the sedimentation diversion component (2). In this area, the water is guided to the outlet (21) of the first sedimentation zone and the outlet (22) of the second sedimentation zone, and then enters the vertical compartment sedimentation structure formed by the first guide baffle (23) and the second guide baffle (24), where the flow direction disturbance and particle sedimentation are completed inside. S3: After the groundwater has settled in the sedimentation zone, it is discharged through the outlet (21) of the first sedimentation zone and the outlet (22) of the second sedimentation zone, and introduced into the water-conducting gap formed between the bottom support partition (25) and the filter box (1). S4: The water is filtered through the filter screen (3) at the water guide gap to remove larger impurity particles remaining after sedimentation; S5: Guide the pre-filtered groundwater to flow sequentially through two sets of drawer-type water filtration channels (4). Each of the two sets of drawer-type water filtration channels (4) is equipped with a filter element pull-out frame (41). The water passes sequentially through the upper filter screen (42), the hollow structure filled with filter element (43), and the lower filter screen (44) in the filter element pull-out frame (41) to complete multi-stage filtration. S6: The water that has undergone multi-stage filtration is introduced into the bottom of the filter box (1) and discharged through the drain outlet (5); S7: The pH value of the discharged water is detected by the pH value measuring device (6) installed inside the filter box (1) to determine whether the water quality after treatment meets the reinjection requirements. If it does, the water is introduced into the reinjection well to complete the underground reinjection operation.

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