CN-122013851-A - Recharging well with degassing and pressurizing functions and construction method thereof

CN122013851ACN 122013851 ACN122013851 ACN 122013851ACN-122013851-A

Abstract

The invention relates to the technical field of groundwater recharging, in particular to a recharging well with degassing and pressurizing functions and a construction method thereof. The water-stop type recharging well comprises a recharging well body, two water supply pipelines, a check valve, an air pumping system, a pressurizing system, a control system and a water stop switch, wherein the hollow part of the recharging well body is divided into a negative pressure cavity, a pressurizing cavity and a filtering cavity from top to bottom in sequence through a partition plate, one end of one water supply pipeline is connected to the negative pressure cavity, the other end of the water supply pipeline is connected to a recharging water source head, two ends of the other water supply pipeline are respectively communicated with the negative pressure cavity and the pressurizing cavity, a water stop switch is arranged in each water supply pipeline, the check valve is arranged between the pressurizing cavity and the filtering cavity, the air pumping system is connected with the negative pressure cavity, the pressurizing system is connected with the pressurizing cavity, and the control system is connected with the water stop switch, the air pumping system and the pressurizing system. The recharging well main body is divided into the negative pressure cavity, the pressurizing cavity and the filtering cavity, so that recharging water firstly enters the negative pressure cavity to discharge bubbles, then enters the pressurizing cavity to be discharged into the filtering cavity through pressurization, finally is discharged into the confined aquifer through filtering of the filtering cavity, and the recharging well main body avoids the air resistance effect caused by the bubbles in recharging water through integrating the functions of gas discharge, pressurization and filtering in the recharging well main body.

Inventors

LIU XIAOTIAN
WU SIHAN
LI ZHONGYUAN
CHEN XING
WANG XUGAO
SANG WEI
HUANG XIANGFENG
LIU HOUHUA
ZHAO JIANFENG
CUI YUNFEI

Assignees

中建八局环保科技有限公司
东华大学
中国建筑第八工程局有限公司

Dates

Publication Date: 20260512
Application Date: 20260320

Claims (9)

1. A recharging well having degassing and pressurizing functions, comprising: The recharging well main body (2) is arranged into a hollow cylindrical structure and is vertically buried in the soil layer (1), and the hollow part of the recharging well main body (2) is sequentially divided into a negative pressure cavity (3), a pressurizing cavity (4) and a filtering cavity (5) from top to bottom through a partition plate (33); one end of one water supply pipeline (34) is connected with the negative pressure cavity (3), the other end of the water supply pipeline is connected with the recharging water source head, two ends of the other water supply pipeline (34) are respectively communicated with the negative pressure cavity (3) and the pressurizing cavity (4), and a water stop switch (323) is arranged in each water supply pipeline (34); the one-way valve (41) is arranged between the pressurizing cavity (4) and the filter cavity (5) and is used for enabling recharging water in the pressurizing cavity (4) to enter the filter cavity (5); The air extraction system is connected with the negative pressure cavity (3) and is used for extracting air in the negative pressure cavity (3) so as to generate negative pressure in the negative pressure cavity (3) to separate out gas in recharging water; the pressurizing system is connected with the pressurizing cavity (4) and is used for pressurizing the pressurizing cavity (4) so as to press recharging water into the filter cavity (5); And the control system (32) is in control connection with the water stop switch (323), the air extraction system and the pressurizing system and is used for controlling the opening and closing of the water stop switch (323) and the opening and closing of the air extraction system and the pressurizing system.
2. A recharging well with degassing and pressurizing functions according to claim 1, characterized in that the soil layer (1) comprises a relative water-barrier (11) and a confined aquifer (12); The recharging well main body (2) comprises a hollow well pipe, a water-resisting layer (22) and a filtering layer (23) which are arranged on the periphery of the well pipe, wherein the water-resisting layer (22) is arranged above the filtering layer (23), the water-resisting layer (22) is arranged in the opposite water-resisting layer (11), and the filtering layer (23) is arranged in the confined aquifer (12); A plurality of through holes are formed in the surface of a section of the well pipe corresponding to the filter layer (23); the negative pressure cavity (3) and the pressurizing cavity (4) are formed on the inner side of the water-resisting layer (22), the filter cavity (5) is formed on the inner side of the filter layer (23), a plurality of filter holes are formed in the filter layer (23), and the recharging water in the filter cavity (5) can enter the confined aquifer (12) through the filter holes in the filter layer (23).
3. A recharging well with degassing and pressurizing functions as set forth in claim 1, wherein said pumping system comprises: the first air pump is in control connection with the control system (32); One end of the air extraction pipeline (311) is connected with the first air pump, and the other end of the air extraction pipeline extends into the negative pressure cavity (3); And the air extraction switch (312) is arranged in the air extraction pipeline (311) and is in control connection with the control system (32).
4. A recharging well with degassing and pressurizing functions as set forth in claim 1, wherein said pressurizing system comprises: the second air pump is in control connection with the control system (32); One end of the pressurizing pipeline (411) is connected with the second air pump, and the other end of the pressurizing pipeline extends into the pressurizing cavity (4); The pressurizing switch (412) is arranged in the pressurizing pipeline (411) and is in control connection with the control system (32); One end of the pressure relief pipe is communicated with the pressurizing cavity (4), the other end of the pressure relief pipe is communicated with the outside, the pressure relief pipe is used for keeping the pressure in the pressurizing cavity (4) balanced with the outside, a pressure relief valve is arranged in the pressure relief pipe, and the pressure relief valve is connected with the control system (32).
5. Recharging well with degassing and pressurizing functions according to claim 1, characterized in that a liquid level sensor is arranged in the pressurizing cavity (4), which is connected with the control system (32).
6. Recharging well with degassing and pressurizing functions according to claim 1, characterized in that the filter chamber (5) is internally provided with: The size of the outer wall of the recharging pipe (52) is matched with the size of the inner wall of the recharging well main body (2), the outer wall of the recharging pipe (52) is attached to the inner wall of the recharging well main body (2), and a plurality of water permeable holes are formed in the recharging pipe (52); The number of the extension pipes (51) is smaller than the number of the water permeable holes, the extension pipes (51) are movably connected in the water permeable holes of the recharging pipes (52), and one corresponding ends of the extension pipes (51) can penetrate through the water permeable holes and the recharging well main body (2) and extend into the soil layer (1).
7. A construction method of a recharging well with degassing and pressurizing functions according to claim 1, which is characterized by comprising the following steps: S1, excavating a soil layer (1) within the design range of a recharging well main body (2) according to a design drawing; S2, constructing the recharging well main body (2) at the excavation position; s3, providing a partition plate (33), and fixing the partition plate (33) on the inner wall of the recharging well main body (2), so as to divide the internal space of the recharging well main body (2) into three chambers; s4, installing a water supply pipeline (34) and a one-way valve (41); S5, installing an air extraction system, a pressurization system and a control system, and connecting the control system to a water stop switch (323) in the air extraction system, the pressurization system and a water supply pipeline (34).
8. The construction method of the recharging well with degassing and pressurizing functions according to claim 7, wherein the recharging well main body (2) comprises a hollow well pipe, a water-resisting layer (22) and a filter layer (23) which are arranged on the periphery of the well pipe, the water-resisting layer (22) is positioned above the filter layer (23), and the specific construction method of the recharging well main body (2) is as follows: arranging the well pipe in a hole formed after excavation; Providing grading grits, backfilling the grading grits to a specified height on the periphery of the well casing to form a filter layer (23); And (3) providing dry clay balls, backfilling the dry clay balls on the periphery of the well pipe, backfilling the dry clay balls to the top of the formed filter layer (23), and expanding the dry clay balls by water absorption to form a water-resisting layer (22), thereby completing the construction of the recharging well main body (2).
9. The construction method of the recharging well with the degassing and pressurizing functions according to claim 8, wherein before the well pipe is laid, a recharging pipe (52) and a plurality of extension pipes (51) are provided, a plurality of water permeable holes are uniformly formed on the surface of the recharging pipe (52), and through holes corresponding to the water permeable holes are formed at corresponding positions of the well pipe; Fixing a recharging pipe (52) in the well pipe, so that the water permeable holes are aligned with the corresponding through holes; Arranging an extension pipe (51) in the recharging pipe (52), and inserting the corresponding end of the extension pipe (51) into a water permeable hole of the recharging pipe (52); after the well pipe is laid, the extension pipe (51) is moved, and the corresponding end of the extension pipe (51) penetrates through the through hole of the well pipe and is inserted into the soil layer (1).

Description

Recharging well with degassing and pressurizing functions and construction method thereof Technical Field The invention relates to the technical field of groundwater recharging, in particular to a recharging well with degassing and pressurizing functions and a construction method thereof. Background The development and utilization of groundwater resources support the social and economic development and simultaneously cause a series of environmental and geological problems such as continuous decline of groundwater level, ground subsidence and the like. To relieve these pressures, manual recharging has become a key engineering technique to replenish groundwater reserves, control ground subsidence, improve water quality, and maintain ecological balance. The existing recharging technology mainly relies on gravity recharging (natural recharging), and although the recharging technology has a simple structure and low cost, two remarkable and common technical defects are exposed in actual operation, so that recharging efficiency and sustainability are severely restricted: 1. The gas phase blocking (air blocking) effect is that the ground water source often carries a large amount of dissolved gas or bubbles during recharging. After the water body enters the porous medium of the aquifer under the action of gravity, dissolved gas can be separated out and form tiny bubbles due to pressure rise, temperature change or water flow disturbance. These bubbles accumulate and adhere in the pore channels to form local "airlocks" which drastically reduce the local permeability of the aquifer medium near the recharging well. This phenomenon is one of the main reasons for the rapid decay of recharging well efficiency with run time, and conventional well flushing methods have difficulty in effectively removing such deep gas plugs. 2. The recharging pressure is insufficient, the recharging effect radius is limited (usually only a few meters to tens of meters) only by means of natural gravity, and the water head of the target confined aquifer is difficult to effectively lift in a large range. Meanwhile, the lower infiltration flow rate enables fine suspended particles carried in the water body to be deposited and silted near a well wall filter screen or at an entrance of an aquifer more easily, and further the reduction of recharging capacity is accelerated. In order to overcome the limitation of gravity recharging, a pressurized recharging technology is proposed in the industry, that is, an external power device (such as a pressurizing pump) is used to increase the recharging head so as to increase the injection pressure and flow. However, most existing pressurized recharging schemes generally ignore the design of active control of the gas phase components in the recharging water. Under high pressure, dissolved gas or existing micro-bubbles in the water body can be forced into the deep part of the aquifer, and can be precipitated and accumulated again in the area with finer medium and higher pressure, so that deep gas phase blockage with wider range and higher strength can be formed. This blockage is more concealed and difficult to repair by conventional maintenance means, essentially a "pressure-change blockage" non-sustainable mode, which may permanently damage the aquifer structure in the long term. Thus, none of the existing recharging techniques (whether gravity or simple pressurization) systematically address the core pair of contradictions between gas and pressure. The air lock effect is an inherent physical bottleneck, while insufficient pressure limits the macroscopic effect of recharging. Simply increasing the pressure without eliminating the air supply may exacerbate the problem of plugging. Disclosure of Invention The invention aims to overcome the defects of the prior art, provides a recharging well with degassing and pressurizing functions and a construction method thereof, and solves the problem that bubbles in recharging water cannot be separated out from the existing recharging well, so that the air resistance effect is caused. The technical scheme for achieving the purpose is as follows: the invention provides a recharging well with degassing and pressurizing functions, which comprises the following steps: The recharging well main body is arranged into a hollow cylindrical structure and is vertically buried in the soil layer, and the hollow part of the recharging well main body is sequentially divided into a negative pressure cavity, a pressurizing cavity and a filtering cavity from top to bottom through a partition plate; One end of one water supply pipeline is connected with the negative pressure cavity, the other end of the water supply pipeline is connected with the recharging water source head, two ends of the other water supply pipeline are respectively communicated with the negative pressure cavity and the pressurizing cavity, and a water stop switch is arranged in each water supply pipeline; The one-way val