A device for preventing groundwater recharge gas phase blockage and its construction method

Abstract

The present invention is a device for preventing gas phase blockage of groundwater recharge and a construction method thereof. The device comprises a well wall pipe and a filter pipe, a plurality of through holes are arranged on the side wall of the filter pipe, a semicircular rotating plate is installed in the well wall pipe through a rotating positioning assembly, a rotating rod is fixed on the top of the semicircular rotating plate, a sleeve is arranged outside the rotating rod, the upper end of the sleeve is fixed on the top of the well wall pipe and the lower end is attached to the top of the semicircular rotating plate, a plurality of metal mesh plates are arranged above the semicircular rotating plate in the well wall pipe, a partition plate is welded on the outer wall of the sleeve, the upper end of the partition plate is arranged flush with the top of the uppermost metal mesh plate and the lower end is attached to the top of the semicircular rotating plate, a recharge pipe and a backwash pipe are arranged above the semicircular rotating plate in the well wall pipe, the recharge pipe and the backwash pipe are distributed on both sides of the partition plate, and an exhaust pipe connected to the inner cavity is arranged on the top of the well wall pipe. The present invention achieves the effect of absorbing bubbles in the water before the recharge water enters the aquifer; the backwash outside the aquifer does not disturb the aquifer and does not affect the recharge.

Description

Technical Field

[0001] The invention relates to the technical field of engineering precipitation recharge, and in particular to a device for preventing gas phase blockage of groundwater recharge and a construction method thereof. Background Art

[0002] During the construction and use of underground projects, sometimes they cannot operate normally due to the influence of groundwater, and precipitation must be carried out. Precipitation causes the water level to drop, and the pore water pressure in the soil is transferred and dissipated, which not only breaks the original mechanical balance of the soil and increases the effective stress; but also increases the hydraulic gradient within the range of the water level drop funnel, and the permeability acting on the soil in the form of volume force increases; the result of the combined effect of the two is that the soil around the pit settles and deforms. In order to reduce the impact of precipitation on surrounding buildings and underground pipelines, recharging technology can be used.

[0003] At present, there have been some successful examples of using artificial recharge to reduce and eliminate the impact of foundation pit dewatering on the surrounding environment. Artificial recharge has shown significant economic benefits in protecting the safety of surrounding buildings during foundation pit dewatering.

[0004] However, in the actual groundwater recharge process, the recharged water contains more gas than natural groundwater. When these recharged waters containing a large amount of gas enter the aquifer, the bubbles will continue to gather and accumulate in the pores of the aquifer, blocking the permeability channels of the aquifer, causing the recharge efficiency of the aquifer to continue to decrease. It is very common for gas phase blockage to occur during the recharge of the aquifer. The smaller the particle size of the sand particles in the water-bearing medium, the more obvious the blockage phenomenon. If the aquifer is blocked, most of them will use the method of backwashing to alleviate the blockage of the recharge well. However, backwashing is not suitable for all recharge projects, because some aquifers may change their lithology due to backwashing, making the permeability of the aquifer worse. Too frequent backwashing will not only increase the project cost, but may also have the opposite effect and reduce the permeability of the aquifer, or even cause permanent blockage. Summary of the invention

[0005] The present invention aims to solve the deficiencies of the prior art and provides a device for preventing groundwater recharge gas phase blockage and a construction method thereof.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A device for preventing groundwater recharge from gas phase blockage comprises a well wall pipe and a filter pipe connected up and down, the well wall pipe is closed at the top, the filter pipe is closed at the bottom and a plurality of through holes are arranged on the side wall, a semicircular rotating plate is installed in the well wall pipe through a rotating positioning assembly, a rotating rod is fixed on the top of the semicircular rotating plate, the rotating rod is coaxially arranged with the well wall pipe and the upper end passes through the top of the well wall pipe, a casing is arranged outside the rotating rod, the upper end of the casing is fixed to the top of the well wall pipe and the lower end is attached to the top of the semicircular rotating plate, a plurality of metal mesh plates are arranged above the semicircular rotating plate in the well wall pipe, a partition plate is welded on the outer wall of the casing, both side walls of the partition plate are attached to the inner wall of the well wall pipe, the upper end of the partition plate is flush with the top of the uppermost metal mesh plate and the lower end is attached to the top of the semicircular rotating plate, a reinjection pipe and a recoil pipe are arranged above the semicircular rotating plate in the well wall pipe, the reinjection pipe and the recoil pipe are distributed on both sides of the partition plate, the upper ends of the reinjection pipe and the recoil pipe pass through the metal mesh plate and then pass through the top of the well wall pipe, and an exhaust pipe connected with the inner cavity is arranged at the top of the well wall pipe.

[0008] The rotary positioning assembly comprises a supporting ring fixed on the inner wall of the well wall pipe, a groove is arranged on the inner wall of the supporting ring, a limiting arc block is arranged on the arc side wall of the semicircular rotating plate, and the limiting arc block is slidably installed in the groove.

[0009] A closing plug is detachably mounted on the top of the exhaust pipe.

[0010] The outer wall of the filter tube is provided with a ribbed wire-wrapped filter layer, a ribbed mesh filter layer, or a gravel layer.

[0011] The two side walls of the partition plate are fixedly arranged in contact with the inner wall of the well wall pipe.

[0012] The construction method of the above-mentioned gas phase blocking device for preventing groundwater recharge comprises the following specific steps:

[0013] S1. According to the design of the recharge well, determine the depth of the recharge well, and determine the length of the well wall pipe and filter pipe according to the thickness of the recharge aquifer;

[0014] S2, process and assemble the recharging pipe, recoil pipe, exhaust pipe, rotating rod, casing, metal mesh plate, partition plate and semicircular rotating plate, weld the supporting ring to the inner wall of the well wall pipe, and then connect the well wall pipe and the filter pipe;

[0015] S3. Lower the recharging well structure and backfill the gap between the well wall pipe and the hole wall as required;

[0016] S4. Use the rotating rod to rotate the semicircular rotating plate to the bottom of the recharging pipe, close the recoil pipe, open the recharging pipe, and the recharging water is recharged from the recharging pipe. The recharging water passes through several metal mesh plates, and the bubbles in the water are adsorbed on the surface of the metal mesh plates, which plays a role in removing bubbles. The bubbles continue to overflow from the exhaust pipe;

[0017] S5. Microbubbles are constantly accumulated on the metal mesh plate, causing blockage and reducing the reinjection efficiency. Observe the water level rising in the well wall pipe. When the water level rises to the predetermined position or overflows the exhaust pipe, turn the semicircular rotating plate to the bottom of the recoil pipe, close the recoil pipe, open the recoil pipe to recoil the metal mesh plate, and after solving the blockage problem, repeat step S4 to perform the reinjection operation.

[0018] In step S4, when the initial recharge efficiency is low, the exhaust pipe is closed with a sealing plug and pressurized recharge is adopted.

[0019] In step S5, the water level in the well wall pipe is observed by lowering a water level gauge from the exhaust pipe for observation.

[0020] The beneficial effects of the present invention are as follows: the present invention achieves the effect of absorbing bubbles in the water before the recharged water enters the aquifer, thereby preventing the bubbles in the water from entering the aquifer; the recharged water outside the aquifer does not disturb the aquifer and does not affect the recharge. The device of the present invention has a simple construction method, can be assembled in the factory, assembled on site, repeatedly used, fast in construction, and can be recharged uninterruptedly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural diagram of the gas phase blocking device for preventing groundwater recharge in the present invention;

[0022] Figure 2 It is a schematic diagram of the internal structure of the gas phase blocking device for preventing groundwater recharge in the present invention;

[0023] Figure 3 It is a schematic diagram of the structure of the support ring and the semicircular rotating plate in the present invention;

[0024] In the figure: 1-well wall tube; 2-filter tube; 3-through hole; 4-semicircular rotating plate; 5-rotating rod; 6-casing; 7-metal mesh plate; 8-separator plate; 9-recharge pipe; 10-recoil pipe; 11-exhaust pipe; 12-support ring; 13-groove; 14-limiting arc block;

[0025] The following is a detailed description of the embodiments of the present invention with reference to the accompanying drawings. DETAILED DESCRIPTION

[0026] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention. The present invention is described in more detail by way of example with reference to the accompanying drawings in the following paragraphs. The advantages and features of the present invention will become clearer according to the following description and claims. It should be noted that the drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0027] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0029] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0030] like Figures 1 to 3 As shown, a device for preventing gas phase blockage of groundwater recharge comprises a well wall pipe 1 and a filter pipe 2 connected up and down, the well wall pipe 1 is closed at the top, the filter pipe 2 is closed at the bottom and a plurality of through holes 3 are arranged on the side wall, a semicircular rotating plate 4 is installed in the well wall pipe 1 through a rotating positioning assembly, a rotating rod 5 is fixed on the top of the semicircular rotating plate 4, the rotating rod 5 is coaxially arranged with the well wall pipe 1 and the upper end passes through the top of the well wall pipe 1, a casing 6 is arranged outside the rotating rod 5, the upper end of the casing 6 is fixed to the top of the well wall pipe 1 and the lower end is attached to the top of the semicircular rotating plate 4, the well wall pipe 1 is inside the semicircular rotating plate 4 is provided with a plurality of metal mesh plates 7 above, a partition plate 8 is welded on the outer wall of the casing 6, and the two side walls of the partition plate 8 are fitted with the inner wall of the well wall pipe 1, the upper end of the partition plate 8 is flush with the top of the uppermost metal mesh plate 7 and the lower end is fitted with the top of the semicircular rotating plate 4, and a recharging pipe 9 and a recoil pipe 10 are provided above the semicircular rotating plate 4 in the well wall pipe 1. The recharging pipe 9 and the recoil pipe 10 are distributed on both sides of the partition plate 8, and the upper ends of the recharging pipe 9 and the recoil pipe 10 pass through the metal mesh plate 7 and then pass through the top of the well wall pipe 1, and the top of the well wall pipe 1 is provided with an exhaust pipe 11 connected with the inner cavity.

[0031] The metal mesh plate 7 has finer meshes, which can absorb bubbles in the water. When the reinjected water passes through the metal mesh plate 7, the large bubbles carried in the water will be directly isolated by the metal mesh plate 7. In addition, since the metal mesh plate 7 has a finer filter, smaller bubbles will also continue to accumulate on the metal mesh plate 7. In addition, since the metal mesh plate 7 has a finer filter, smaller bubbles will also continue to accumulate on the metal mesh plate 7. These large and small bubbles will eventually float up and be discharged through the exhaust pipe 11.

[0032] The partition plate 8 is used to divide the space inside the pipe into two independent spaces, thereby extending the water flow path.

[0033] The rotation positioning assembly includes a support ring 12 fixed on the inner wall of the well wall pipe 1, a groove 13 is provided on the inner wall of the support ring 12, and a limiting arc block 14 is provided on the arc side wall of the semicircular rotating plate 4. The limiting arc block 14 is slidably installed in the groove 13.

[0034] A sealing plug is detachably mounted on the top of the exhaust pipe 11 .

[0035] The outer wall of the filter tube 2 is provided with a reinforcement wire-wrapped filter layer, a reinforcement mesh-wrapped filter layer, or a gravel layer.

[0036] The two side walls of the partition plate 8 are fixedly arranged in contact with the inner wall of the well wall pipe 1 .

[0037] The construction method of the above-mentioned gas phase blocking device for preventing groundwater recharge comprises the following specific steps:

[0038] S1. According to the design of the recharge well, determine the depth of the recharge well, and determine the length of the well wall pipe 1 and the filter pipe 2 according to the thickness of the recharge aquifer;

[0039] S2, process and assemble the recharging pipe 9, the recoil pipe 10, the exhaust pipe 11, the rotating rod 5, the casing 6, the metal mesh plate 7, the partition plate 8 and the semicircular rotating plate 4, weld the supporting ring 12 to the inner wall of the well wall pipe 1, and then connect the well wall pipe 1 and the filter pipe 2;

[0040] S3, lower the recharging well structure and backfill the gap between the well wall pipe 1 and the hole wall as required;

[0041] S4, use the rotating rod 5 to rotate the semicircular rotating plate 4 to the bottom of the recharging pipe 9, close the recoil pipe 10, open the recharging pipe 9, and the recharging water is recharged through the recharging pipe 9. The recharging water passes through a plurality of metal mesh plates 7, and the bubbles in the water are adsorbed on the surface of the metal mesh plates 7, which plays a role in removing the bubbles, and the bubbles continuously overflow from the exhaust pipe 11;

[0042] S5. After microbubbles continuously accumulate on the metal mesh plate 7, causing blockage and reducing the recharge efficiency, observe the water level rising in the well wall pipe 1. When the water level rises to a predetermined position or overflows the exhaust pipe 11, turn the semicircular rotating plate 4 to the bottom of the recoil pipe 10, close the recharge pipe 9, open the recoil pipe 10 to recoil the metal mesh plate 7, and after solving the blockage problem, repeat step S4 to perform the recharge operation.

[0043] In step S4, when the initial recharging efficiency is low, the exhaust pipe 11 is closed with a sealing plug and pressurized recharging is adopted.

[0044] In step S5 , the water level in the well wall pipe 1 is observed by lowering a water level gauge from the exhaust pipe 11 for observation.

[0045] The invention achieves the effect of absorbing bubbles in water before the recharged water enters the aquifer, thereby preventing bubbles in water from entering the aquifer; the recharged water outside the aquifer does not disturb the aquifer and does not affect the recharge. The device of the invention has a simple construction method, can be assembled in the factory, assembled on site, repeatedly used, fast in construction, and can be recharged uninterruptedly.

[0046] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the present invention, or are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A device for preventing gas phase blockage of groundwater recharge, characterized in that: The invention comprises a well wall pipe (1) and a filter pipe (2) connected to each other in an upper and lower manner, wherein the well wall pipe (1) is closed at the top, the filter pipe (2) is closed at the bottom and has a plurality of through holes (3) on its side wall, a semicircular rotating plate (4) is installed in the well wall pipe (1) via a rotating positioning assembly, the rotating positioning assembly comprises a supporting ring (12) fixed on the inner wall of the well wall pipe (1), a groove (13) is provided on the inner side wall of the supporting ring (12), a limiting arc block (14) is provided on the arc side wall of the semicircular rotating plate (4), and the limiting arc block (14) is slidably installed in the groove (13); a rotating rod (5) is fixed on the top of the semicircular rotating plate (4), the rotating rod (5) is coaxially arranged with the well wall pipe (1) and the upper end thereof passes through the top of the well wall pipe (1), a sleeve (6) is provided outside the rotating rod (5), and the upper end of the sleeve (6) is fixed to the well wall pipe (1). ) and the lower end is attached to the top of the semicircular rotating plate (4); a plurality of metal mesh plates (7) are provided inside the well wall pipe (1) above the semicircular rotating plate (4); a partition plate (8) is welded on the outer wall of the casing (6); the two side walls of the partition plate (8) are attached to the inner wall of the well wall pipe (1); the upper end of the partition plate (8) is flush with the top of the uppermost metal mesh plate (7) and the lower end is attached to the top of the semicircular rotating plate (4); a recharging pipe (9) and a recoil pipe (10) are provided inside the well wall pipe (1) above the semicircular rotating plate (4); the recharging pipe (9) and the recoil pipe (10) are distributed on both sides of the partition plate (8); the upper ends of the recharging pipe (9) and the recoil pipe (10) pass through the metal mesh plate (7) and then pass through the top of the well wall pipe (1); an exhaust pipe (11) connected to the inner cavity is provided at the top of the well wall pipe (1).

2. The device for preventing groundwater recharge gas phase blockage according to claim 1, characterized in that: A closing plug is detachably mounted on the top of the exhaust pipe (11).

3. A device for preventing groundwater recharge gas phase blockage according to claim 2, characterized in that: The outer wall of the filter tube (2) is provided with a ribbed wire-wrapped filter layer or a ribbed mesh-wrapped filter layer.

4. The device for preventing groundwater recharge gas phase blockage according to claim 2, characterized in that: A gravel layer is attached to the outer wall of the filter tube (2).

5. A device for preventing groundwater recharge gas phase blockage according to any one of claims 1 to 4, characterized in that: The two side walls of the partition plate (8) are fixedly arranged in contact with the inner wall of the well wall pipe (1).

6. A construction method for preventing groundwater recharge gas phase blockage according to claim 5, characterized in that: The specific steps are: S1. Determine the depth of the recharge well according to the recharge well design, and determine the length of the well wall pipe (1) and the filter pipe (2) according to the thickness of the recharge aquifer; S2, processing and assembling the recharging pipe (9), the recoil pipe (10), the exhaust pipe (11), the rotating rod (5), the casing (6), the metal mesh plate (7), the partition plate (8) and the semicircular rotating plate (4), welding the supporting ring (12) to the inner wall of the well wall pipe (1), and then connecting the well wall pipe (1) and the filter pipe (2); S3, lowering the recharging well structure and backfilling the gap between the well wall pipe (1) and the hole wall as required; S4, using the rotating rod (5) to rotate the semicircular rotating plate (4) to the bottom of the recharging pipe (9), closing the recoil pipe (10), opening the recharging pipe (9), and recharging water is recharged through the recharging pipe (9). The recharging water passes through a plurality of metal mesh plates (7), and bubbles in the water are adsorbed on the surface of the metal mesh plates (7), thereby removing the bubbles, and the bubbles continuously overflow from the exhaust pipe (11); S5. After the microbubbles are continuously accumulated on the metal mesh plate (7), causing blockage and reducing the reinjection efficiency, the water level in the well wall pipe (1) is observed to rise. When the water level rises to a predetermined position or overflows the exhaust pipe (11), the semicircular rotating plate (4) is rotated to the bottom of the recoil pipe (10), the reinjection pipe (9) is closed, and the recoil pipe (10) is opened to recoil the metal mesh plate (7). After the blockage problem is solved, the reinjection operation is repeated in step S4.

7. A construction method for preventing groundwater recharge gas phase blockage according to claim 6, characterized in that: In step S4, when the initial re-injection efficiency is low, the exhaust pipe (11) is closed with a sealing plug and pressurized re-injection is adopted.

8. A construction method for preventing groundwater recharge gas phase blockage according to claim 7, characterized in that: In step S5, the water level in the well wall pipe (1) is observed by lowering a water level gauge from the exhaust pipe (11) for observation.

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