Vacuum pressure type recharge device for pumping and recharging underground water in deep foundation pit in balanced manner

Abstract

The invention relates to the technical field of underground water recharging, and particularly discloses a deep foundation pit underground water pumping and recharging balanced vacuum pressure type recharging device which comprises a basic hardware system, a sealing isolation system, a dynamic regulation and control system and a monitoring feedback system. The sealing isolation system comprises a vacuum well lid; according to the pipeline sealing assembly, a hydraulic drive sealing ring is arranged at the joint of a dewatering well water outlet pipe and a recharge well water inlet pipe, the sealing ring automatically expands to fill gaps during water injection, and air permeation is thoroughly isolated; through triple air isolation formed by water pumping pipe head immersion, vacuum well lid sealing and hydraulic sealing rings, contact between underground water and air is reduced to the maximum extent, oxidation reaction is reduced from the source, and the precipitation amount of iron and manganese oxides is reduced by 60% or above; meanwhile, bubbles and sediments can be effectively removed, more than 90% of bubbles and sediments can be actively removed through a periodic back raising and silt pumping mechanism, the anti-blocking performance of the recharge well is remarkably improved, and therefore the service life of the recharge well is prolonged.

Description

Technical Field

[0001] This application belongs to the field of groundwater recharge technology, specifically relating to a vacuum pressurized recharge device for balancing groundwater pumping and recharge in deep foundation pits. Background Technology

[0002] With the increasing development of urban underground space, the depth and scale of foundation pits are growing, leading to a greater impact from widespread rainfall. Dense urban buildings, existing shallow-foundation old buildings, old pipelines, and newly constructed utility tunnels are all negatively affected by underground space development. Recharge technology has been introduced to balance groundwater extraction and recharge. Recharge not only effectively reduces water waste but is also an effective means of addressing consolidation and settlement caused by rainfall. Recharging groundwater to reduce the impact of rainfall on the surrounding environment has become a relatively economical and simple control measure.

[0003] However, groundwater often contains low-valence iron and manganese ions. In the closed reducing environment underground, these ions can remain stable. But when the groundwater is pumped out and comes into contact with air, the low-valence iron and manganese ions will undergo an oxidation reaction to generate high-valence iron and manganese oxide precipitates. These precipitates will gradually clog the filter screen and filter media, which will seriously affect the service life of the reinjection well, and may even lead to the abandonment of the reinjection well. Summary of the Invention

[0004] The purpose of this application is to provide a vacuum pressurized recharge device for balancing groundwater pumping and recharge in deep foundation pits, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] A vacuum pressurized recharge system for balancing groundwater pumping and recharge in deep foundation pits includes:

[0007] Basic hardware system, sealing and isolation system, dynamic control system and monitoring and feedback system;

[0008] The sealed isolation system includes:

[0009] Vacuum manhole cover;

[0010] The pipeline sealing assembly is equipped with a hydraulically driven sealing ring at the connection between the outlet pipe of the dewatering well and the inlet pipe of the recharge well. When water is injected, the sealing ring automatically expands to fill the gap, completely preventing air from seeping in.

[0011] The fully submersible pipe head means that both the outlet pipe head of the dewatering well and the inlet pipe head of the recharge well are completely submerged in the water of the recharge well, forming a "liquid isolation barrier" to reduce the chance of groundwater coming into contact with air.

[0012] The dynamic control system includes:

[0013] Three-way valves and check valves are installed in the reinjection pipeline to achieve water flow switching during the "reinjection-sinking" stage (water is delivered through a 6-inch inlet during the reinjection stage and pumped out through a 4-inch sinking outlet during the sinking stage).

[0014] The 150 butterfly valve and the 100 butterfly valve control the flow of the main pipeline and the branch pipeline respectively, and can be used with the 150 water meter and the 100 water meter to achieve precise adjustment of the flow of a single well;

[0015] The pressurized control module monitors the pressure inside the reinjection well in real time through a pressure gauge, and maintains a stable pressurized environment inside the well in conjunction with a vacuum system, enabling independent pressurized reinjection of a single well.

[0016] Preferably, the basic hardware system includes:

[0017] The dewatering well pipeline inside the foundation pit is used to connect the dewatering system and the recharge system. It adopts a 6-inch main pipeline to adapt to the high flow rate transportation requirements.

[0018] The reinjection well features a deep structural design, suitable for medium to coarse sand and gravel formations. The well is equipped with a 4-inch return outlet and a 6-inch inlet (corresponding to the water flow switching during the reinjection / return stage).

[0019] The backflow pump is installed inside the reinjection well and connected to the surface control system via a pump pipe. It is used for periodic backflow dredging.

[0020] The water pump is located inside the dewatering well, with the pump head completely submerged in water to prevent groundwater from coming into contact with air during the pumping process.

[0021] Preferably, the monitoring feedback system includes:

[0022] Automatic water level gauge monitors the water level in the reinjection well in real time and links the start and stop of the water pump (ensuring that the pump head is always submerged).

[0023] The flow meter accurately measures the reinjection volume, pumping volume, and external drainage volume, enabling dynamic balance control.

[0024] The data terminal integrates water level, flow rate, and pressure data to automatically generate backflow cycle suggestions (dynamically adjusting the backflow frequency based on sedimentation volume and bubble concentration).

[0025] Preferably, the vacuum well cover has symmetrically opened through holes, and the vacuum well cover is provided with a sealing and fastening assembly. The sealing and fastening assembly includes two retaining rings on both sides, and a sealing ring is fixedly connected to the outer side of each retaining ring on both sides. The top of the vacuum well cover has a groove, and a nut head is movably installed inside the groove. The vacuum well cover has a cavity inside, and a lead screw is rotatably connected inside the cavity. A gear is fixedly connected to the lead screw, and racks are symmetrically arranged inside the cavity.

[0026] Preferably, the retaining rings on both sides are symmetrically arranged at both ends of the cavity, and the sealing rings on both sides are arc-shaped and symmetrically arranged.

[0027] Preferably, the nut head is installed at the top of the lead screw, the racks on both sides are engaged with gears, and the retaining rings on both sides are respectively installed at the ends of the racks on both sides.

[0028] Compared with the prior art, the beneficial effects of this application are:

[0029] (1) The triple air isolation formed by “immersion of pumping pipe head + vacuum well cover sealing + hydraulic sealing ring” minimizes the contact between groundwater and air, reduces oxidation reaction from the source, and reduces the amount of iron and manganese oxide precipitation by more than 60%. At the same time, it can effectively remove air bubbles and sediment. The “periodic backfilling and sludge removal” mechanism can actively remove more than 90% of air bubbles and sediment. With the design of detachable device, it is convenient for later maintenance and significantly improves the anti-clogging performance of the recharge well, thereby extending the service life of the recharge well. In deep foundation pit projects of medium and coarse sand and gravel strata, the service life of the recharge well is extended to more than 3 years, which is far higher than the average service life of 6-12 months of traditional technology, greatly reducing the frequency and cost of equipment replacement.

[0030] (2) Through innovative design and collaborative mechanism, it can meet the needs of large flow and long-term reinjection in medium and coarse sand and gravel formations: relying on the design of 6-inch main pipeline, vacuum pressurized environment and deep reinjection well structure, it can realize long-term large flow reinjection, which solves the problem of reinjection difficulty in this type of formation in the existing technology; at the same time, it can also achieve precise control: the combination of automated monitoring equipment and independent pressurized module can control water level fluctuation within ≤5cm and flow error within ≤3%, ensuring the stability of water level and water volume during reinjection, and avoiding the instability of traditional overall pressurization method.

[0031] (3) The locking function can be achieved by the two retaining rings on both sides of the sealing fastening assembly during installation. With the arc-shaped and symmetrical sealing rings set on the outer side of the retaining rings, they can fit tightly in the gap between the vacuum well cover and the installation part, which greatly improves the sealing effect after installation, effectively prevents the vacuum environment from being disturbed by the outside, and ensures the normal operation of related equipment or systems. At the same time, when the sealing effect deviates or decreases, the sealing performance can be restored and enhanced by adjusting the position of the retaining rings, which extends the service life of the vacuum well cover and improves its reliability and adaptability. Attached Figure Description

[0032] Figure 1 This is one of the planar design drawings of the device in this application;

[0033] Figure 2 This is the second plan view of the device in this application;

[0034] Figure 3This is one of the operation flowcharts of the device in this application;

[0035] Figure 4 This is the second flowchart of the device operation in this application;

[0036] Figure 5 This is the third flowchart of the device operation in this application;

[0037] Figure 6 This is a perspective view of the vacuum manhole cover of this application;

[0038] Figure 7 This is a three-dimensional view of the internal structure of the vacuum manhole cover in this application.

[0039] In the diagram: 1. Vacuum manhole cover; 11. Through hole; 12. Snap ring; 13. Sealing ring; 14. Groove; 15. Nut head; 16. Cavity; 17. Lead screw; 18. Gear; 19. Rack. Detailed Implementation

[0040] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0041] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0042] Example 1:

[0043] Please see Figure 1-5 As shown, the vacuum pressurized recharge device for groundwater pumping and recharge balancing in deep foundation pits includes:

[0044] Basic hardware system, sealing and isolation system, dynamic control system and monitoring and feedback system;

[0045] The basic hardware system includes:

[0046] The dewatering well pipeline inside the foundation pit is used to connect the dewatering system and the recharge system. It adopts a 6-inch main pipeline to adapt to the high flow rate transportation requirements.

[0047] The reinjection well features a deep structural design, suitable for medium to coarse sand and gravel formations. The well is equipped with a 4-inch return outlet and a 6-inch inlet (corresponding to the water flow switching during the reinjection / return stage).

[0048] The backflow pump is installed inside the reinjection well and connected to the surface control system via a pump pipe. It is used for periodic backflow dredging.

[0049] The water pump is installed inside the dewatering well, with the pump head completely submerged in water to prevent groundwater from coming into contact with air during the pumping process;

[0050] The sealed isolation system includes:

[0051] Vacuum manhole cover 1;

[0052] The pipeline sealing assembly is equipped with a hydraulically driven sealing ring at the connection between the outlet pipe of the dewatering well and the inlet pipe of the recharge well. When water is injected, the sealing ring automatically expands to fill the gap, completely preventing air from seeping in.

[0053] The fully submersible pipe head means that both the outlet pipe head of the dewatering well and the inlet pipe head of the recharge well are completely submerged in the water of the recharge well, forming a "liquid isolation barrier" to reduce the chance of groundwater coming into contact with air.

[0054] The dynamic control system includes:

[0055] Three-way valves and check valves are installed in the reinjection pipeline to achieve water flow switching during the "reinjection-sinking" stage (water is delivered through a 6-inch inlet during the reinjection stage and pumped out through a 4-inch sinking outlet during the sinking stage).

[0056] The 150 butterfly valve and the 100 butterfly valve control the flow of the main pipeline and the branch pipeline respectively, and can be used with the 150 water meter and the 100 water meter to achieve precise adjustment of the flow of a single well;

[0057] The pressurized control module monitors the pressure inside the reinjection well in real time through a pressure gauge, and maintains a stable pressurized environment inside the well in conjunction with a vacuum system, enabling independent pressurized reinjection of a single well.

[0058] The basic hardware system includes:

[0059] The dewatering well pipeline inside the foundation pit is used to connect the dewatering system and the recharge system. It adopts a 6-inch main pipeline to adapt to the high flow rate transportation requirements.

[0060] The reinjection well features a deep structural design, suitable for medium to coarse sand and gravel formations. The well is equipped with a 4-inch return outlet and a 6-inch inlet (corresponding to the water flow switching during the reinjection / return stage).

[0061] The backflow pump is installed inside the reinjection well and connected to the surface control system via a pump pipe. It is used for periodic backflow dredging.

[0062] The water pump is located inside the dewatering well, with the pump head completely submerged in water to prevent groundwater from coming into contact with air during the pumping process.

[0063] Working principle:

[0064] Recharge phase:

[0065] The dewatering well pump extracts groundwater (both the pump head and the outlet pipe are submerged) and delivers it to the 6-inch inlet of the reinjection well through a sealed pipeline; the vacuum well cover 1 and the hydraulic sealing ring ensure that the entire pipeline is in a closed state, reducing air contact; the 150 butterfly valve and flow meter regulate the flow rate, and together with the pressurized module, maintain the set pressure in the well to achieve high-flow deep reinjection.

[0066] Recovery phase:

[0067] When a decrease in reinjection efficiency is detected (such as slow water level rise or abnormal pressure), the three-way valve switches to the backflow mode. The backflow pump back-pumps the water in the reinjection well through the 4-inch backflow port, and discharges the precipitated iron and manganese oxides, accumulated air bubbles and a small amount of fine sand through the external discharge pipeline. After the backflow is completed, the reinjection mode is switched back to restore efficient reinjection.

[0068] Synergistic mechanism:

[0069] The combination of "immersion of the pumping pipe head + sealing of the vacuum well cover + hydraulic sealing ring" forms a triple air isolation, minimizing groundwater oxidation and reducing the precipitation of iron and manganese oxides from the source.

[0070] "Single-well pressurized control + real-time monitoring by flow meter / water level gauge" enables precise control of flow rate and water level, avoiding the instability of traditional overall pressurization;

[0071] "Periodic backfilling and sludge removal" actively removes air bubbles and sediment, and the detachable device design facilitates later maintenance and ensures long-term backfilling effect.

[0072] Example 2:

[0073] refer to Figure 6 and Figure 7 As shown, the vacuum well cover 1 has symmetrical through holes 11. The vacuum well cover 1 is equipped with a sealing and fastening assembly, which includes two retaining rings 12 on both sides. A sealing ring 13 is fixedly connected to the outer side of each retaining ring 12. The top of the vacuum well cover 1 has a groove 14, and a nut head 15 is movably installed inside the groove 14. The vacuum well cover 1 has a cavity 16 inside. A lead screw 17 is rotatably connected inside the cavity 16. A gear 18 is fixedly connected to the lead screw 17. A rack 19 is symmetrically arranged inside the cavity 16.

[0074] As can be seen from the above, the through holes 11 on both sides of the vacuum well cover 1 facilitates the installation and removal of the vacuum well cover 1 using hooks. The retaining rings 12 on both sides lock the vacuum well cover 1 during installation, and the sealing rings 13 on the outer side of the retaining rings 12 improve the sealing performance after installation.

[0075] When installing the vacuum well cover 1, insert a wrench of the corresponding size into the nut head 15. Then rotate the wrench so that the nut head 15 drives the screw 17 to rotate. The screw 17 drives the gear 18 to rotate, which in turn drives the movement of the racks 19 on both sides. This causes the racks 19 to move the retaining ring 12, thus sealing the vacuum well cover 1.

[0076] Preferably, the retaining rings 12 on both sides are symmetrically arranged at both ends of the cavity 16, and the sealing rings 13 on both sides are arc-shaped and symmetrically arranged.

[0077] As can be seen from the above, the two retaining rings 12 can move inside the cavity 16, which makes it convenient to adjust the position of the retaining rings 12, so that adjustments can be made when the seal is poor later; while the two symmetrical sealing rings 13 can fit into the gap between the vacuum well cover 1 and the installation part, improving the sealing performance of the vacuum well cover 1 after installation.

[0078] Preferably, the nut head 15 is installed at the top of the lead screw 17, both sides of the rack 19 mesh with the gear 18, and the two side retaining rings 12 are respectively installed at the ends of the rack 19 on both sides;

[0079] As can be seen from the above, the nut head 15 is installed at the top of the lead screw 17 so that when the nut head 15 rotates, it can also drive the lead screw 17 to rotate; when the lead screw 17 rotates, it will drive the gear 18 to drive the racks 19 on both sides to move, thereby causing the racks 19 on both sides to drive the retaining rings 12 on both sides to move.

[0080] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A vacuum pressurized recharge device for balancing groundwater pumping and recharge in deep foundation pits, characterized in that, include: Basic hardware system, sealing and isolation system, dynamic control system and monitoring and feedback system; The sealed isolation system includes: Vacuum manhole cover (1); The pipeline sealing assembly is equipped with a hydraulically driven sealing ring at the connection between the outlet pipe of the dewatering well and the inlet pipe of the recharge well. When water is injected, the sealing ring automatically expands to fill the gap, completely preventing air from seeping in. The fully submersible pipe head means that both the outlet pipe head of the dewatering well and the inlet pipe head of the recharge well are completely submerged in the water of the recharge well, forming a "liquid isolation barrier" to reduce the chance of groundwater coming into contact with air. The dynamic control system includes: Three-way valves and check valves are installed in the reinjection pipeline to achieve water flow switching during the "reinjection-surge" stage (water is supplied through a 6-inch inlet during the reinjection stage and pumped out through a 4-inch surge outlet during the surge stage). The 150 butterfly valve and the 100 butterfly valve control the flow of the main pipeline and the branch pipeline respectively, and can be used with the 150 water meter and the 100 water meter to achieve precise adjustment of the flow of a single well; The pressurized control module monitors the pressure inside the reinjection well in real time through a pressure gauge, and maintains a stable pressurized environment inside the well in conjunction with a vacuum system, enabling independent pressurized reinjection of a single well.

2. The vacuum pressurized recharge device for deep foundation pit groundwater pumping and recharge balancing according to claim 1, characterized in that: The basic hardware system includes: The dewatering well pipeline inside the foundation pit is used to connect the dewatering system and the recharge system. It adopts a 6-inch main pipeline to adapt to the high flow rate transportation requirements. The reinjection well features a deep structural design, suitable for medium to coarse sand and gravel formations. The well is equipped with a 4-inch return outlet and a 6-inch inlet (corresponding to the water flow switching during the reinjection / return stage). The backflow pump is installed inside the reinjection well and connected to the surface control system via a pump pipe. It is used for periodic backflow dredging. The water pump is located inside the dewatering well, with the pump head completely submerged in water to prevent groundwater from coming into contact with air during the pumping process.

3. The vacuum pressurized recharge device for deep foundation pit groundwater pumping and recharge balancing according to claim 1, characterized in that: The monitoring and feedback system includes: Automatic water level gauge monitors the water level in the reinjection well in real time and links the start and stop of the water pump (ensuring that the pump head is always submerged). The flow meter accurately measures the reinjection volume, pumping volume, and external drainage volume, enabling dynamic balance control. The data terminal integrates water level, flow rate, and pressure data to automatically generate backflow cycle suggestions (dynamically adjusting the backflow frequency based on sedimentation volume and bubble concentration).

4. The vacuum pressurized recharge device for deep foundation pit groundwater pumping and recharge balancing according to claim 1, characterized in that: The vacuum well cover (1) is provided with symmetrical through holes (11). The vacuum well cover (1) is provided with a sealing fastening assembly. The sealing fastening assembly includes two retaining rings (12) on both sides. A sealing ring (13) is fixedly connected to the outer side of each retaining ring (12). The top of the vacuum well cover (1) is provided with a groove (14). A nut head (15) is movably installed inside the groove (14). The vacuum well cover (1) is provided with a cavity (16). A lead screw (17) is rotatably connected inside the cavity (16). A gear (18) is fixedly connected to the lead screw (17). A rack (19) is symmetrically provided inside the cavity (16).

5. The vacuum pressurized recharge device for deep foundation pit groundwater pumping and recharge balancing according to claim 4, characterized in that: The retaining rings (12) on both sides are symmetrically arranged at both ends of the cavity (16), and the sealing rings (13) on both sides are arc-shaped and symmetrically arranged.

6. The vacuum pressurized recharge device for deep foundation pit groundwater pumping and recharge balancing according to claim 4, characterized in that: The nut head (15) is installed at the top of the lead screw (17), the racks (19) on both sides are engaged with the gears (18), and the retaining rings (12) on both sides are installed at the ends of the racks (19) on both sides respectively.

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