Underground water centralized recharge structure

Abstract

The utility model provides an underground water centralized recharge structure which comprises a recharge well, and water in the recharge well can permeate into a plurality of sand and gravel layers through a well wall recharge structure and a recharge radiant tube. The concentrated recharge structure further comprises a desilting device and a desilting and throwing device which is installed in the recharge well and used for throwing coagulation precipitants into the recharge well. Concentrated recharge is achieved through the recharge well, the recharge area is large, the buffer space is large, the recharge radiant tube penetrates through a plurality of sand and gravel layers, the recharge area is enlarged, the reverse pressure of a stratum in the recharge process is relieved, the phenomenon that a water-bearing layer is blocked is relieved, and the service life is long; a dredging device is used for eliminating the silting state of a surrounding aquifer of the recharge well and a well wall recharge structure, the recharge performance of the aquifer is recovered, and the recharge water amount is stabilized; and a coagulation precipitator is put through the silt removal putting device, and flocculates in water are subjected to silt removal and sand setting treatment, so that the flocculates are prevented from blocking a recharge well and a sandy gravel layer, and the recharge water amount is stabilized.

Description

Technical Field

[0001] The utility model belongs to the technical field of groundwater recharging, and in particular relates to a groundwater centralized recharging structure. Background Art

[0002] As we all know, groundwater plays an important role in resource, geological and ecological functions, and over-exploitation of groundwater will lead to ecological and geological problems such as ground subsidence, ground fissures, seawater intrusion and wetland degradation. Therefore, groundwater recharge is needed to increase groundwater resources, control and increase groundwater levels, and prevent adverse consequences such as water quality deterioration, ground subsidence or seawater intrusion caused by a sharp drop in groundwater levels.

[0003] CN200610053556.2 discloses a groundwater centralized supply multi-point recharge system, in which the recharge system is configured in multiple levels with the water supply system, and the cross-sectional area of ​​the recharge system is larger than that of the water supply system. It adopts central water supply and peripheral multi-point recharge, and recharges in a pressureless self-seepage manner. However, the recharge system of multi-point recharge has a large overall footprint and is not suitable for places with tight land use. Moreover, the cross-sectional area of ​​a single recharge well is small, the recharge intensity is large, the recharge pressure of the stratum is large, and the fine particles in the gravel layer move a lot. Over time, the gravel layer is easily blocked, resulting in slow recharge. In addition, during the water extraction and operation process, due to temperature changes and oxidation, the free ions in the groundwater will be oxidized and precipitated into flocculants, which are easily blocked by the bridging effect and the recharge well and gravel layer are difficult to recharge. Utility Model Content

[0004] The utility model aims to solve the technical problems existing in the prior art and the purpose of the utility model is to provide a groundwater centralized recharging structure.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a groundwater centralized recharge structure, including a large-diameter recharge well extending into the sand and gravel layer, the well wall of the recharge well is provided with a well wall recharge structure, the water in the recharge well can penetrate into the sand and gravel layer through the well wall recharge structure, the bottom of the recharge well is provided with a silt removal pool, the silt removal pool is connected to a silt removal pump, and the centralized recharge structure also includes at least one of the following structures:

[0006] Structure 1: It also includes a dredging device, which includes a multi-layer dredging structure connected to the side wall of the recharging well and arranged at intervals in the height direction and extending into the sand and gravel layer. Each layer of the dredging structure includes a plurality of dredging pipe groups arranged at intervals in the circumferential direction. Each dredging pipe group includes a backwash inlet pipe for injecting water from the recharging well into the sand and gravel layer, and a silt discharge outlet pipe for discharging silt from the sand and gravel layer into the recharging well. Control valves are provided on the backwash inlet pipe and the silt discharge outlet pipe.

[0007] Structure 2: It also includes a silt removal device installed in the reinjection well for injecting a coagulant precipitant into the reinjection well.

[0008] The above technical solution realizes centralized recharge by setting a large-diameter recharge well. The cross-sectional area of ​​the recharge well is large, the recharge area is large, and there is a large buffer space, which reduces the reverse pressure of the stratum during recharge, reduces the blockage of the aquifer, and has a long service life. By setting a recharge radiation tube inclined downward, the length of the radiation tube passes through multiple aquifers, and by setting a dredging device, when the aquifer is blocked due to long-term use and the recharge water volume is reduced, the dredging device is turned on to dredge the sand and gravel layer around the recharge well and the well wall recharge structure, eliminate the siltation state of the aquifer around the recharge well and the well wall recharge structure, restore the recharge performance of the aquifer, and stabilize the recharge water volume. By setting a silt removal device to release a coagulant precipitant, the flocculants in the recharge well water are treated to remove turbidity and sand, avoid the flocculants from clogging the recharge well and the sand and gravel layer, and stabilize the recharge water volume. By setting up a silt removal pool and a silt removal pump, muddy materials and flocculants are settled in the silt removal pool and pumped out by the silt removal pump, which can effectively reduce the mud and sand content in the recharge water, reduce the siltation process of the centralized recharge well, ensure the stability of the recharge water volume, and extend the maintenance cycle.

[0009] In a preferred embodiment of the present invention, there are multiple silt discharge outlet pipes, which are located below the backwash inlet pipe, and the distance between the outlet ends of the silt discharge outlet pipes is greater than the distance between the inlet ends.

[0010] In the above technical solution, the backwash inlet pipe draws out the water in the recharge well to flush the sand and gravel layer around the recharge well. The flushing water scatters and seeps downward, and the flushed silt enters the recharge well through the silt discharge outlet pipe. Moreover, the distance between the outlet ends of the silt discharge outlet pipe is greater than the distance between the inlet ends, so the water flow disturbance effect is greater, which is more conducive to the dredging of the well wall recharge structure.

[0011] In a preferred embodiment of the present utility model, the silt discharge outlet pipe has a drainage slope.

[0012] The above technical solution is conducive to flushing silt into the recharging well.

[0013] In a preferred embodiment of the present utility model, the well wall recharging structure is a reverse wedge-shaped filtering structure made of concrete, stainless steel or fiberglass.

[0014] The above technical solution has good recharging effect and is not easy to rust.

[0015] In a preferred embodiment of the present invention, a plurality of reinjection radiation tubes are connected to the lower side wall of the reinjection well and are inserted into the sand and gravel layer and radiate therefrom.

[0016] In the above technical solution, multiple reinjection radiation tubes are inserted into the sand and gravel layer, which effectively improves the radiation range of reinjection and increases the reinjection water volume per unit time; and reinjection is carried out in a slow seepage manner to reduce the difficulty of reinjection.

[0017] In another preferred embodiment of the present invention, the reinjection radiation pipe is inserted obliquely downward into the multiple aquifers from the reinjection well.

[0018] In the above technical solution, the inclined reinjection radiation pipe passes through multiple aquifers, expands the reinjection area, realizes multi-layer reinjection, reduces the reinjection intensity, prevents siltation, and extends the service life.

[0019] In another preferred embodiment of the present invention, the reinjection radiation pipe is installed in the sand and gravel layer by using a synchronous follow-up pipe drilling process.

[0020] The above technical solution adopts the synchronous pipe drilling technology, and the drilling and installation are completed in one go, avoiding the mud wall protection + well washing process of the conventional drilling technology and reducing the chance of siltation.

[0021] In another preferred embodiment of the utility model, a tube recoil device for recoil the recharge radiation tube is also installed in the recharge well, and the tube recoil device uses high-pressure water or high-pressure air to perform oscillating backwashing on the recharge radiation tube.

[0022] In the above technical solution, when the reinjection radiation pipe is blocked due to long-term use and the reinjection water volume is reduced, the pipe backwashing device is turned on to backwash the reinjection radiation pipe to eliminate the siltation of the aquifer around the reinjection radiation pipe, restore the reinjection performance of the aquifer, and stabilize the reinjection water volume.

[0023] In another preferred embodiment of the utility model, a turbidity meter for detecting the turbidity of the water therein is also installed in the recharge well, the signal output end of the turbidity meter is connected to the turbidity input end of the controller, and the delivery output control end of the controller is connected to the enable end of the silt removal delivery device.

[0024] In the above technical solution, the turbidity meter monitors the turbidity of the reinjection water in real time, and according to the turbidity of the reinjection water, the silt removal device is operated to automatically add a quantitative coagulant precipitant.

[0025] In another preferred embodiment of the utility model, a water level meter for detecting the water level of the well is also installed in the recharge well, the signal output end of the water level meter is connected to the water level input end of the controller, and the backwash output control end of the controller is connected to the enable end of the dredging device.

[0026] In the above technical solution, the water level meter monitors the water level of the recharge well in real time, and according to the water level of the recharge well, the silt removal device is operated to automatically backwash the well wall recharge structure to restore the recharge water volume.

[0027] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0029] Figure 1 It is a schematic diagram of the main structure of a groundwater centralized recharging structure of an embodiment.

[0030] Figure 2 It is a schematic diagram of the top view of a groundwater centralized recharging structure of an embodiment.

[0031] The figure marks in the drawings of the specification include: recharge well 1, well wall recharge structure 2, silt removal pipe group 3, backwash inlet pipe 4, silt removal outlet pipe 5, silt removal pool 6, silt removal pump 7, silt removal pipe 8, silt removal delivery device 9, turbidity meter 10, recharge radiation tube 11, pipe backwash device 12, control valve 13, water level meter 14. DETAILED DESCRIPTION

[0032] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0033] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "vertical", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0034] In the description of the present utility model, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal connection of two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0035] Embodiment 1

[0036] This embodiment provides a groundwater centralized recharge structure, such as Figure 1 and Figure 2 As shown, in a preferred embodiment, the centralized recharge structure includes a large-diameter recharge well 1 extending into the gravel layer (aquifer), and the wall of the recharge well 1 is provided with a well wall recharge structure 2, and the water in the recharge well 1 can penetrate into the gravel layer through the well wall recharge structure 2. The well wall recharge structure 2 can specifically adopt a reverse wedge-shaped filtration structure, such as made of concrete, stainless steel or fiberglass, etc., with good recharge effect and not easy to rust. Preferably, the diameter of the recharge well 1 is not less than 5m, the recharge well 1 has a large diameter, has a large buffer space, and has a low recharge intensity; it is further preferred that a recharge layer is provided at the bottom of the recharge well 1 to increase the effective recharge area.

[0037] A desilting tank 6 is also provided at the bottom of the recharging well 1, and a desilting pump 7 is connected to the desilting tank 6. The desilting pump 7 is installed in the desilting tank 6, and a desilting pipe 8 is connected to the outlet of the desilting pump 7. The outlet of the desilting pipe 8 extends to the ground. The muddy material and flocculants in the recharging well 1 are precipitated into the desilting tank 6 and are pumped out by the desilting pump 7, which can effectively reduce the mud and flocculants content in the water in the recharging well 1.

[0038] The centralized recharging structure of the utility model also includes at least one of the following structures:

[0039] Structure 1: The centralized recharge structure also includes a dredging device, which includes a multi-layer dredging structure connected to the side wall of the recharge well 1 and arranged at intervals along the height direction. Each layer of the dredging structure includes a plurality of groups of dredging pipe groups 3 arranged at intervals in the circumferential direction. Each group of dredging pipe groups 3 includes a backwash inlet pipe 4 for injecting water in the recharge well 1 into the sand and gravel layer, and a silt discharge outlet pipe 5 for discharging silt in the sand and gravel layer into the recharge well 1. A control valve 13 is provided on the backwash inlet pipe 4 and the silt discharge outlet pipe 5, and the control valve 13 is installed on the inner wall of the recharge well 1.

[0040] Specifically, the desilting device can be started periodically or manually, specifically by opening the control valve 13 of the desilting pipe group 3, and the water in the recharge well 1 is injected into the sand and gravel layer outside the recharge well 1 through the backwash inlet pipe 4 to flush the sand and gravel layer. The silt after flushing is discharged into the recharge well 1 through the silt discharge outlet pipe 5, and the silt is finally precipitated into the silt discharge pool 6; and the water in the recharge well 1 will generate water flow disturbance when it goes in and out, and can also remove particulate matter in the well wall recharge structure 2. Preferably, the water in the recharge well 1 is pressurized by a water pump and transported through the backwash inlet pipe 4, and the sand and gravel layer is flushed by high-pressure water, so that the desilting effect is better, and the high-pressure water can enter the recharge well 1 more smoothly through the silt discharge outlet pipe 5.

[0041] Structure 2: The centralized recharge structure also includes a silt removal delivery device 9 installed in the recharge well 1 for delivering a coagulant precipitant into the recharge well 1. In this embodiment, the silt removal delivery device 9 can be started periodically or manually, and the silt removal delivery device 9 delivers a coagulant precipitant into the recharge well 1 to remove turbidity and sedimentation from the water in the recharge well 1. The sedimented mud and sand enter the sedimentation tank set at the bottom of the well, and are then discharged by the silt discharge pump 7, effectively reducing the flocculant content in the water of the recharge well 1, reducing the silting process of the centralized recharge structure, ensuring the stability of the water quality and water volume of the recharge well 1, and extending the maintenance cycle.

[0042] The utility model preferably provides a silt removal device and a silt removal delivery device 9 at the same time.

[0043] In another preferred embodiment of the utility model, a turbidity meter 10 for detecting the turbidity of the water quality therein is also installed in the recharging well 1, and the signal output end of the turbidity meter 10 is connected to the turbidity input end of the controller, and the delivery output control end of the controller is connected to the enabling end of the desilting delivery device 9. The turbidity meter 10 monitors the turbidity of the water in the recharging well 1 in real time, and the controller controls the desilting delivery device 9 to work according to the turbidity of the water in the recharging well 1, so as to automatically add a quantitative coagulant precipitant.

[0044] In the present invention, there are multiple silt discharge outlet pipes 5, which are located below the backwash inlet pipe 4. The distance between the outlet ends of the silt discharge outlet pipes 5 is greater than the distance between the inlet ends. For example, a silt discharge outlet pipe 5 is provided on each side below the backwash inlet pipe 4. Preferably, the silt discharge outlet pipe 5 has a drainage slope, that is, the outer end of the silt discharge outlet pipe 5 away from the recharge well 1 is inclined upward. The backwash inlet pipe 4 draws water out of the recharge well 1 and flushes the sand and gravel layer around the recharge well 1. The flushed silt seeps with the water and enters the recharge well 1 through the silt discharge outlet pipe 5.

[0045] In another preferred embodiment, a plurality of reinjection radiation tubes 11 are connected to the lower side wall of the bottom of the reinjection well 1, which diverge around it, and the radiation distance of the reinjection radiation tubes 11 is greater than 50m, which effectively expands the reinjection area. Preferably, the reinjection radiation tubes 11 are inserted obliquely downward from the reinjection well 1 into the sand and gravel layer, and the reinjection radiation tubes 11 pass through multiple aquifers to expand the reinjection area, realize multi-layer reinjection, reduce the reinjection intensity, prevent siltation, and extend the service life.

[0046] Preferably, the reinjection radiation pipe 11 is installed in the sand and gravel layer by synchronous follow-up pipe drilling technology, and the maximum drilling distance can reach 60-80m, which effectively increases the radiation range of reinjection and reduces the difficulty of reinjection. The reinjection radiation pipe 11 adopts a new filter produced by advanced foreign technology, which has a large porosity (effective porosity of 40%-50%), improved rust-proof material, good hydraulic conditions, and is not prone to reinjection blockage.

[0047] In another preferred embodiment, a tube recoil device 12 for recoil the reinjection radiation tube 11 is also installed in the reinjection well 1. The tube recoil device 12 uses high-pressure water or high-pressure air to perform oscillating backwashing on the reinjection radiation tube 11 to remove muddy materials that cause clogging in the reinjection radiation tube 11, form a new filtration layer, and restore the reinjection performance.

[0048] In another preferred embodiment, a water level meter 14 for detecting the turbidity of the water quality is also installed in the recharging well 1. The signal output end of the water level meter 14 is connected to the water level input end of the controller, and the desilting output control end of the controller is connected to the enabling end of the desilting device and the pipe backwashing device 12. The water level meter 14 monitors the water level of the recharging well 1 in real time, and the controller obtains the water level of the recharging well 1. When the water level is lower than the minimum water level threshold, the controller controls the desilting device and the pipe backwashing device 12 to work, so as to automatically backwash the well wall recharging structure 2 and the recharging radiation tube 11 to restore the recharging water volume.

[0049] In another preferred embodiment, the backwash water inlet pipe 4 of the desilting pipe group 3 is a double-layer casing structure, the outer layer is a permeable pipe, and the inner layer is a retractable water pipe. Preferably, the upper part of the permeable pipe wall is a solid closed structure, and the lower part of the pipe wall is an open structure with a support column connected to the upper part of the pipe wall. The water output by the retractable water pipe flows out through the front end outlet of the permeable pipe and the lower open structure. By adjusting the length of the retractable water pipe, different areas of the sand and gravel layer can be backwashed.

[0050] More preferably, a water flow rate detector is provided outside the inner telescopic water pipe, and the output end of the water flow rate detector is connected to the control end of the water pump. By detecting the water seepage rate of the telescopic water pipe at different lengths, the siltation condition is obtained (the water seepage rate and the siltation condition can be determined by prior experiments), and the water flow pressure of the water pump is controlled so that the water flow pressure is positively correlated with the siltation condition, thereby achieving a good dredging effect.

[0051] When the centralized recharge structure of the utility model is in operation, the water in the recharge well 1 is recharged into the sand and gravel layer through the well wall recharge structure 2 and the recharge radiation tube 11. The water level meter 14 monitors the water level of the recharge well 1 in real time. According to the water level data of the water level meter 14 or manually starting the silt removal device, the silt removal pipe group 3 below the water level is preferably started, and the water in the recharge well 1 is injected into the sand and gravel layer through the backwash water inlet pipe 4. The silt removal water outlet pipe 5 discharges the sewage in the sand and gravel layer into the recharge well 1, and at the same time generates water flow disturbance to remove the particulate matter in the well wall recharge structure 2. The turbidity meter 10 monitors the turbidity of the water in the recharge well 1 in real time. The controller controls the silt removal delivery device 9 to deliver the coagulant precipitant into the recharge well 1 according to the turbidity of the water in the recharge well 1, and the flocculants are precipitated into the silt removal pool 6. The silt removal pump 7 is started regularly or manually to discharge the silt in the silt removal pool 6.

[0052] The effective reinjection volume of the centralized reinjection structure of the utility model is more than 300m3, which is much larger than that of conventional reinjection wells. The reinjection well 1 has a large buffer space, which reduces the reverse pressure of the formation during reinjection, and adopts slow seepage to carry out reinjection, which reduces the difficulty of reinjection.

[0053] Conventional recharge adopts multi-well recharge. Considering the recharge water volume of 300m3 / h, the total effective recharge area of ​​three recharge wells is about 56m2, and the recharge speed is about 0.002m / s. The centralized recharge structure of the utility model not only has recharge of the well wall and the bottom of the well, but also has recharge of the recharge radiation tube 11. The effective recharge area of ​​a single recharge well 1 is about 110m2, which is about 90% higher than that of conventional multi-well recharge. The recharge speed is about 0.0007m / s, which is less than the requirements of national standards and conventional recharge wells. The recharge intensity is low and the recharge difficulty is small.

[0054] In the description of this specification, the description with reference to the terms "preferred embodiment", "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0055] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A groundwater centralized recharge structure, characterized in that: It includes a large-diameter recharge well extending into the sand and gravel layer, the well wall of the recharge well is provided with a well wall recharge structure, the water in the recharge well can penetrate into the sand and gravel layer through the well wall recharge structure, the bottom of the recharge well is provided with a silt removal pool, the silt removal pool is connected to a silt removal pump, and the centralized recharge structure also includes at least one of the following structures: Structure 1: It also includes a dredging device, which includes a multi-layer dredging structure connected to the side wall of the recharging well and arranged at intervals in the height direction and extending into the sand and gravel layer. Each layer of the dredging structure includes a plurality of groups of dredging pipes arranged at intervals in the circumferential direction. Each group of dredging pipes includes a backwash inlet pipe for injecting water from the recharging well into the sand and gravel layer, and a silt discharge outlet pipe for discharging silt from the sand and gravel layer into the recharging well. Control valves are provided on the backwash inlet pipe and the silt discharge outlet pipe. Structure 2: It also includes a silt removal device installed in the reinjection well for injecting a coagulant precipitant into the reinjection well.

2. A groundwater centralized recharge structure according to claim 1, characterized in that: There are multiple silt discharge outlet pipes, and the multiple silt discharge outlet pipes are located below the backwash inlet pipe. The distance between the outlet ends of the silt discharge outlet pipes is greater than the distance between the inlet ends.

3. A groundwater centralized recharging structure according to claim 1, characterized in that: The silt discharge outlet pipe has a drainage slope.

4. A groundwater centralized recharging structure according to claim 1, characterized in that: The well wall recharging structure is a reverse wedge-shaped filtering structure made of concrete, stainless steel or glass fiber reinforced plastic.

5. The groundwater centralized recharging structure according to claim 1, characterized in that: The lower side wall of the reinjection well is connected with a plurality of reinjection radiation tubes which are diffused around the reinjection well and inserted into the sand and gravel layer.

6. A groundwater centralized recharging structure according to claim 5, characterized in that: The reinjection radiation pipe is inserted obliquely downward from the reinjection well into a plurality of aquifers.

7. A groundwater centralized recharging structure according to claim 5, characterized in that: The reinjection radiation pipe is installed in the sand and gravel layer by using a synchronous follow-up pipe drilling process.

8. A groundwater centralized recharging structure according to claim 5, characterized in that: The reinjection well is also provided with a tube recoil device for recoil the reinjection radiation tube, and the tube recoil device uses high-pressure water or high-pressure air to perform oscillating backwashing on the reinjection radiation tube.

9. A groundwater centralized recharging structure according to any one of claims 1 to 8, characterized in that: The reinjection well is also equipped with a turbidity meter for detecting the turbidity of the water therein, the signal output end of the turbidity meter is connected to the turbidity input end of the controller, and the delivery output control end of the controller is connected to the enabling end of the desilting delivery device.

10. A groundwater centralized recharging structure according to any one of claims 1 to 8, characterized in that: The recharging well is also equipped with a water level meter for detecting the water level of the well. The signal output end of the water level meter is connected to the water level input end of the controller, and the backwash output control end of the controller is connected to the enabling end of the dredging device.

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