Backwashing structure of underground water monitoring well

Abstract

The utility model discloses a backwashing structure of an underground water monitoring well, which comprises a well casing embedded in the ground surface, a waterproof layer and a gravel filling layer are sequentially arranged on the periphery of the well casing below the ground surface from top to bottom, a well casing bottom plate is arranged at the bottom of the well casing, a water storage barrel is mounted on the ground surface, and a first water pump communicated with the water storage barrel is arranged on one side of the water storage barrel. A backwashing assembly is installed at the gravel filling layer in the well pipe, the first water pump is connected with the backwashing assembly through a pipeline, a second water pump is further arranged on the ground surface, an extraction assembly is embedded in the gravel filling layer, and the second water pump is connected with the extraction assembly through a pipeline. The underground water monitoring well is simple in overall structure, the gravel filling layer can be backwashed, the gravel filling layer is prevented from being blocked by silt, the service life of the underground water monitoring well is longer, water resources are saved, and practicability is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of groundwater monitoring, in particular to a backwashing structure of a groundwater monitoring well. Background Art

[0002] According to the Technical Specifications for Groundwater Monitoring Wells of the Ministry of Land and Resources of the People's Republic of China, monitoring wells mainly monitor dynamic factors such as groundwater level, water quality, water temperature, and water volume. Monitoring wells vary according to the purpose of well construction and the structure of the monitoring wells, but the main processes are: ① Drilling construction to understand the spatial distribution of groundwater layers. ② Select appropriate filter pipe materials and filter hole size distribution according to the type of monitoring well and the purpose of monitoring. ③ Expand the hole, break the wall and change the slurry for smooth pipe lowering. ④ Fill gravel and stop water, fill gravel between the aquifer and the screen pipe to filter water, and use bentonite or cement to stop water between different aquifers. ⑤ Wash the well. ⑥ Install the well cover.

[0003] Before collecting groundwater samples, the water in the monitoring well will be pumped out and released, and then flushed with clean water, which is commonly known as well washing. In current groundwater monitoring wells, groundwater is usually filtered through a gravel fill layer, but after long-term use, the gravel fill layer will be filled with mud and sand, causing the gravel fill layer to be blocked, resulting in the groundwater monitoring well being unable to be used normally. Therefore, the applicant has designed a backwash structure in the groundwater monitoring well, which can flush away the mud and sand in the gravel fill layer, thereby extending the service life of the groundwater monitoring well. Utility Model Content

[0004] In view of the deficiencies of the prior art, the utility model aims to provide a backwash structure for a groundwater monitoring well.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0006] A backwashing structure for a groundwater monitoring well comprises a well pipe embedded in the ground surface, wherein the well pipe is located below the ground surface and is provided with a water-blocking layer and a gravel-filling layer in sequence from top to bottom on all sides thereof, a well pipe bottom plate is provided at the bottom of the well pipe, a water storage barrel is installed on the ground surface, a first water pump connected to the water storage barrel is provided on one side of the water storage barrel, a backwashing assembly is installed in the well pipe at the gravel-filling layer, the first water pump is connected to the backwashing assembly through a pipeline, a second water pump is also provided on the ground surface, an extraction assembly is buried in the gravel-filling layer, and the second water pump is connected to the extraction assembly through a pipeline.

[0007] Furthermore, the backwash assembly includes a plurality of annular flushing pipes, two adjacent annular flushing pipes are connected by a first connecting pipe, a plurality of nozzles are evenly distributed on the annular outer peripheral wall of the annular flushing pipe, and the nozzles pass through the well pipe and contact the gravel filling layer.

[0008] Furthermore, the extraction assembly comprises an extraction main pipe buried in the gravel filling layer, the extraction main pipe is connected to an extraction branch pipe arranged obliquely, and the higher end of the extraction branch pipe is connected to the extraction main pipe.

[0009] Furthermore, one end of the first water pump is connected to the water storage tank through a first water inlet pipe, the other end of the first water pump is connected to the first multi-way pipe through a first water outlet pipe, the branch pipe of the first multi-way pipe is connected to the second connecting pipe, and the second connecting pipe is connected to the annular flushing pipe.

[0010] Furthermore, one end of the second water pump is connected to a second water outlet pipe, the other end of the second water pump is connected to a second multi-way pipe through a second water inlet pipe, a branch pipe of the second multi-way pipe is connected to a third connecting pipe, and the third connecting pipe is connected to the extraction main pipe.

[0011] Furthermore, a portion of the outer cover of the well pipe located above the ground surface is provided with a protective cover plate, and the protective cover plate is embedded in the ground surface.

[0012] Furthermore, the water-blocking layer is clay balls.

[0013] Furthermore, the gravel filling layer is quartz sand.

[0014] Compared with the prior art, the utility model provides a backwash structure for groundwater monitoring wells, which has the following beneficial effects:

[0015] The utility model stores water pumped out of the monitoring well by means of a water storage bucket, and transports the water in the water storage bucket to a backwashing assembly by means of a first water pump, so as to backwash the gravel filling layer, thereby causing the silt in the gravel filling layer to flow, and through the cooperation of the second water pump and the extraction assembly, the silt and water in the gravel filling layer are extracted and discharged externally, so as to avoid clogging the gravel filling layer with silt, thereby prolonging the service life of the groundwater monitoring well. The utility model has a simple overall structure, can backwash the gravel filling layer, so as to avoid clogging the gravel filling layer with silt, thereby prolonging the service life of the groundwater monitoring well, and saves water resources and improves practicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a front view cross-sectional structural schematic diagram of the utility model;

[0017] Figure 2 yes Figure 1 A schematic diagram of the enlarged structure at A in the middle;

[0018] Figure 3 It is a schematic diagram of the top view of the backwashing component of the utility model.

[0019] Markings in the figure: 1. ground surface; 2. well pipe; 3. water-blocking layer; 4. gravel filling layer; 5. water storage barrel; 6. first water pump; 7. backwashing assembly; 71. annular flushing pipe; 72. first connecting pipe; 73. nozzle; 8. second water pump; 9. extraction assembly; 91. extraction main pipe; 92. extraction branch pipe; 10. well pipe bottom plate; 11. protective cover plate; 12. first water inlet pipe; 13. first water outlet pipe; 14. first multi-way pipe; 15. second connecting pipe; 16. second water inlet pipe; 17. second water outlet pipe; 18. second multi-way pipe; 19. third connecting pipe. DETAILED DESCRIPTION

[0020] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0021] The standard parts used in the utility model can all be purchased from the market, and special-shaped parts can be customized according to the instructions and the drawings. The specific connection methods of each part adopt the conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt the conventional models in the existing technology, and the circuit connection adopts the conventional connection method in the existing technology, which will not be described in detail here.

[0022] It should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In the description of the present invention, "plurality" means two or more than two, unless otherwise clearly and specifically defined.

[0025] The utility model embodiment provides a backwash structure for a groundwater monitoring well, referring to Figures 1 to 3, including a well pipe 2 embedded in the ground surface 1, the well pipe 2 is located below the ground surface 1 and is provided with a water-blocking layer 3 and a gravel-filling layer 4 from top to bottom in sequence on all sides, a well pipe bottom plate 10 is provided at the bottom of the well pipe 2, a water storage barrel 5 is installed on the ground surface 1, and a first water pump 6 connected to the water storage barrel 5 is provided on one side of the water storage barrel 5, a backwashing component 7 is installed at the gravel-filling layer 4 in the well pipe 2, the gravel-filling layer 4 is backwashed to make the silt in the gravel-filling layer 4 flow, the first water pump 6 is connected to the backwashing component 7 through a pipeline, a second water pump 8 is also provided on the ground surface 1, an extraction component 9 is buried in the gravel-filling layer 4, the silt and water in the gravel-filling layer 4 are extracted and discharged, so as to prevent the gravel-filling layer 4 from being blocked by the silt, so as to extend the service life of the groundwater monitoring well, and the second water pump 8 is connected to the extraction component 9 through a pipeline.

[0026] Specifically, the well pipe 2 is a PVC plastic pipe, the part of the well pipe 2 located in the water-blocking layer 3 is a waterproof white pipe, and the part of the well pipe 2 located in the gravel filling layer 4 is a flower pipe with a water filtering structure; the well pipe bottom plate 10 is a PVC-U plastic pipe, and the bottom of the well pipe bottom plate 10 is flush with the bottom surface of the gravel filling layer 4; the water pumped out of the monitoring well is stored in the water storage barrel 5 for subsequent backwashing, saving water resources, and can be extracted by a centrifugal pump or a compressed air machine; the extraction assembly 9 can be provided with multiple groups, evenly distributed around the well pipe 2, and arranged according to actual conditions.

[0027] Among them, refer to Figure 1 In this embodiment, the outer cover of the well pipe 2 located above the ground surface 1 is provided with a protective cover plate 11 to protect the well pipe 2 , and the protective cover plate 11 is embedded in the ground surface 1 .

[0028] Reference Figure 1 and Figure 2 In this embodiment, the water blocking layer 3 is a clay ball, and the clay ball is used to stop water around the upper part of the well pipe 2.

[0029] Reference Figure 1 and Figure 2 In this embodiment, the gravel filling layer 4 is quartz sand, which is used to filter the silt in the groundwater of the aquifer to prevent the silt from clogging the holes of the flower tube. After being filtered, the groundwater enters the well pipe 2 through the flower tube at the bottom of the well pipe 2. Since there are gaps in the quartz sand, it is easy to be blocked by silt after a long time.

[0030] Reference Figures 1 to 3 In this embodiment, the backwash assembly 7 includes a plurality of annular flushing pipes 71, and two adjacent annular flushing pipes 71 are connected by a first connecting pipe 72. A plurality of nozzles 73 are evenly distributed on the annular outer wall of the annular flushing pipe 71, and the nozzles 73 pass through the well pipe 2 and contact the gravel filling layer 4.

[0031] Specifically, a plurality of annular flushing pipes 71 are horizontally arranged in multiple layers; the bottom layer of annular flushing pipes 71 is arranged on the well pipe bottom plate 10; the number of annular flushing pipes 71 and nozzles 73 is set according to actual conditions; the diameter of the annular flushing pipe 71 matches the inner diameter of the well pipe 2; the backwashing assembly 7 can be installed together with the well pipe 2 in advance.

[0032] Reference Figure 1 and Figure 2 In this embodiment, the extraction assembly 9 includes an extraction main pipe 91 buried in the gravel filling layer 4, and the extraction main pipe 91 is connected to an extraction branch pipe 92 arranged obliquely, and the higher end of the extraction branch pipe 92 is connected to the extraction main pipe 91.

[0033] Specifically, the extraction main pipe 91 can penetrate the water-blocking layer 3 and extend out of the ground surface 1, so as to be conveniently connected with the pipeline; a plurality of extraction branch pipes 92 are provided, which are connected to the extraction main pipe 91 in a branch-like manner; the diameter of the extraction branch pipe 92 is larger than that of the annular flushing pipe 71, so as to prevent mud and sand from clogging the pipe opening of the extraction branch pipe 92.

[0034] Reference Figure 1 In this embodiment, one end of the first water pump 6 is connected to the water storage barrel 5 through the first water inlet pipe 12, and the other end of the first water pump 6 is connected to the first multi-way pipe 14 through the first water outlet pipe 13, the branch pipe of the first multi-way pipe 14 is connected to the second connecting pipe 15, and the second connecting pipe 15 is connected to the annular flushing pipe 71.

[0035] Specifically, the first water pump 6 can be a booster pump to improve the flushing efficiency of the nozzle 73; the main pipe of the first multi-way pipe 14 is connected to the first water outlet pipe 13; the number of branches of the first multi-way pipe 14 is the same as the number of the second connecting pipes 15, and the number of the second connecting pipes 15 is 4-8, which is set according to actual conditions; the second connecting pipe 15 is connected to the top-layer annular flushing pipe 71.

[0036] Reference Figure 1 In this embodiment, one end of the second water pump 8 is connected to the second water outlet pipe 17, and the other end of the second water pump 8 is connected to the second multi-way pipe 18 through the second water inlet pipe 16. The branch pipe of the second multi-way pipe 18 is connected to the third connecting pipe 19, and the third connecting pipe 19 is connected to the extraction main pipe 91.

[0037] Specifically, the main pipe of the second multi-way pipe 18 is connected to the second water inlet pipe 16; the number of branches of the second multi-way pipe 18 is the same as the number of third connecting pipes 19 and the number of extraction main pipes 91, and the number of third connecting pipes 19 is 8-12, which is set according to actual conditions.

[0038] Preferably, the second connecting pipe 15 and the third connecting pipe 19 are hoses.

[0039] Working principle: Install the backwash assembly 7 and the well pipe 2 together in advance, install the well pipe 2 and the well pipe bottom plate 10 after the drill bit has drilled the well hole, and then install the extraction main pipe 9 in the space between the well pipe 2 and the soil layer, and then fill it with quartz sand and clay balls, and connect the pipelines for use;

[0040] During use, the water pumped out of the monitoring well is stored in the water storage barrel 5. When the gravel filling layer 4 needs to be backwashed, the first water pump 6 is started. The first water pump 6 passes the water in the water storage barrel 5 into the annular flushing pipe 71 through the first water inlet pipe 12, the first water outlet pipe 13, the first multi-way pipe 14 and the second connecting pipe 15 in sequence. The annular flushing pipe 71 is filled with water through the first connecting pipe 72, and the water is sprayed out through the nozzle 73 to backwash the gravel filling layer 4, so that the silt in the gravel filling layer 4 flows. At the same time, the second water pump 8 is started to extract the silt and water in the gravel filling layer 4 through the extraction branch pipe 92, and discharge them through the extraction main pipe 91, the third connecting pipe 19, the second multi-way pipe 18, the second water inlet pipe 16 and the second water outlet pipe 17 in sequence to prevent the gravel filling layer 4 from being blocked by silt, thereby extending the service life of the groundwater monitoring well.

[0041] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0042] The above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit the protection scope of the utility model. Obviously, the described embodiments are only some embodiments of the utility model, rather than all embodiments. Based on these embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model. Although the utility model has been described in detail with reference to the above embodiments, ordinary technicians in this field can still combine, add, delete or make other adjustments to the features in the various embodiments of the utility model according to the circumstances without conflict, without making creative work, so as to obtain different other technical solutions that do not deviate from the concept of the utility model in essence, and these technical solutions also belong to the scope of protection of the utility model.

Claims

1. A backwash structure for a groundwater monitoring well, comprising a well pipe (2) embedded in the ground surface (1), wherein the well pipe (2) is located below the ground surface (1) and is provided with a water blocking layer (3) and a gravel filling layer (4) in order from top to bottom, and a well pipe bottom plate (10) is provided at the bottom of the well pipe (2), characterized in that: A water storage barrel (5) is installed on the ground surface (1), and a first water pump (6) connected to the water storage barrel (5) is provided on one side of the water storage barrel (5). A backwashing assembly (7) is installed in the well pipe (2) at the gravel filling layer (4), and the first water pump (6) is connected to the backwashing assembly (7) through a pipeline. A second water pump (8) is also provided on the ground surface (1), and an extraction assembly (9) is buried in the gravel filling layer (4), and the second water pump (8) is connected to the extraction assembly (9) through a pipeline.

2. The backwash structure for groundwater monitoring well according to claim 1, characterized in that: The backwashing assembly (7) comprises a plurality of annular flushing pipes (71), two adjacent annular flushing pipes (71) are connected via a first connecting pipe (72), a plurality of nozzles (73) are evenly distributed on the annular outer peripheral wall of the annular flushing pipe (71), and the nozzles (73) pass through the well pipe (2) and contact the gravel filling layer (4).

3. The backwash structure for groundwater monitoring well according to claim 1, characterized in that: The extraction assembly (9) comprises an extraction main pipe (91) buried in the gravel filling layer (4), the extraction main pipe (91) is connected to an extraction branch pipe (92) arranged in an inclined manner, and the higher end of the extraction branch pipe (92) is connected to the extraction main pipe (91).

4. The backwash structure for groundwater monitoring well according to claim 2, characterized in that: One end of the first water pump (6) is connected to the water storage barrel (5) via a first water inlet pipe (12), and the other end of the first water pump (6) is connected to a first multi-way pipe (14) via a first water outlet pipe (13); a branch pipe of the first multi-way pipe (14) is connected to a second connecting pipe (15), and the second connecting pipe (15) is connected to an annular flushing pipe (71).

5. The backwash structure for groundwater monitoring well according to claim 3, characterized in that: One end of the second water pump (8) is connected to a second water outlet pipe (17), and the other end of the second water pump (8) is connected to a second multi-way pipe (18) via a second water inlet pipe (16); a branch pipe of the second multi-way pipe (18) is connected to a third connecting pipe (19), and the third connecting pipe (19) is connected to the extraction main pipe (91).

6. The backwash structure for groundwater monitoring well according to claim 1, characterized in that: The outer cover of the well pipe (2) located above the ground surface (1) is provided with a protective cover plate (11), and the protective cover plate (11) is embedded in the ground surface (1).

7. The backwash structure for groundwater monitoring well according to claim 1, characterized in that: The water-blocking layer (3) is a clay ball.

8. The backwash structure for groundwater monitoring well according to claim 1, characterized in that: The gravel filling layer (4) is quartz sand.

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