Underground pumping well structure capable of preventing pollution layer crossing
By designing an underground pumping well structure with anti-pollution strand layer on the pollutant site, using a combination of large-diameter holes and small-diameter holes to isolate the upper and lower pollutants, the problem of upper and lower pollutants is solved, and effectively preventing the downstream of pollutants. Protects the cleaning of deep groundwater.
Patent Information
- Application Number
- CN202420779449.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-16
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-04-16
AI Technical Summary
During the drilling of pump wells in polluted sites, pollutants are easily brought from the upper soil or groundwater to the lower aquifer through unreasonable structure and construction processes, resulting in contamination of the pressure-bearing aquifer.
An underground pumping well structure with anti-pollution string layer was designed, including large-diameter holes, isolation casing, water stop cementing layer, small-diameter holes and water pumping well pipes. By first drilling the upper polluted rock and soil, large-diameter holes were opened and set up. Isolate the casing and water stop cementing layer, then open a small diameter hole and go down the pump hole well pipe to isolate the pollutants in the upper soil and groundwater to prevent them from being transmitted downward.
It effectively avoids the upper and lower layers of pollutants, prevents pollutants in the upper soil and groundwater from communicating with the lower strata, protects the cleaning of deep groundwater, and ensures the reliability of pollution restoration projects.
Smart Images
Figure CN222252216U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of hydrogeological survey, and more specifically, to an anti-pollution layer underground water pumping well structure. Background Art
[0002] Groundwater is an important component of water resources and one of the important water sources for agricultural irrigation, industry, mining and cities. In recent years, groundwater pollution has become increasingly prominent, posing a serious threat and challenge to human health, food safety, drinking water safety, regional ecological environment, economic and social sustainable development and even social stability. The development of groundwater pollution control and remediation is of great significance to the sustainable use of groundwater resources.
[0003] In existing contaminated site remediation projects, most of the pumping wells in the investigation or treatment stages do not take into account the problem of pollutants flowing up and down the layers, resulting in the original deep groundwater not being polluted. However, due to the unreasonable structure and construction technology of the pumping wells, pollutants in the upper soil or groundwater are brought into the lower aquifer during the construction process, causing the contaminated aquifer. Utility Model Content
[0004] The utility model aims to solve the problem of pollutants being deposited in the upper and lower layers during the drilling of pumping wells in polluted sites, and to provide an underground pumping well structure which can effectively prevent pollutants from being deposited in the upper and lower layers.
[0005] An underground pumping well structure for preventing pollution and layering, comprising a large diameter hole, an isolation casing, a water-stopping cementing layer, a small diameter hole, a pumping hole well pipe and a packing layer. The large diameter hole is opened from the ground to below the contaminated soil / aquifer and is located above the confined aquifer. The isolation casing is arranged in the large diameter hole and is at the same height as the large diameter hole, and the outer diameter of the isolation casing is smaller than the inner diameter of the large diameter hole. A water-stopping cementing layer for water-stopping cementing is arranged between the outer wall of the isolation casing and the hole wall of the large diameter hole. The small diameter hole is opened from the bottom of the large diameter hole to the confined aquifer, and the small diameter hole is coaxially arranged with the large diameter hole, and the outer diameter of the small diameter hole is smaller than the inner diameter of the large diameter hole. The pumping hole well pipe is arranged in the isolation casing and the small diameter hole, and is coaxially arranged with the isolation casing and the small diameter hole. The packing layer is arranged between the outer wall of the pumping hole well pipe and the inner wall of the isolation casing and the hole wall of the small diameter hole.
[0006] Furthermore, the lower ends of the large-diameter holes and the isolation casing are located less than 1 m below the contaminated soil / aquifer.
[0007] Furthermore, the isolation sleeve is made of any one of steel, cast iron, PVC, UPVC, PP, PE, and MPP.
[0008] Furthermore, the water-stopping cementing layer is formed by grouting silicate cement.
[0009] Furthermore, the pumping hole well pipe is composed of a well wall pipe section, a water filter pipe section and a sedimentation pipe section from top to bottom, and the water filter pipe section is provided with water filter holes and is wrapped with filter cloth.
[0010] Furthermore, the filler layer includes a gravel filling layer and a sealing layer from bottom to top, and the gravel filling layer is filled at 120%-130% of the thickness of the pressure aquifer from the bottom of the well to the top of the water filter pipe section.
[0011] Furthermore, the material of the pumping hole well pipe is any one of steel, cast iron, PVC, UPVC, PP, PE, and MPP.
[0012] Furthermore, the gravel filling layer is filled with quartz sand.
[0013] Compared with the prior art, the beneficial effects of the utility model are:
[0014] The anti-pollution layer-crossing underground pumping well structure in the utility model can achieve the purpose of isolating pollutants in the upper soil and groundwater, thereby preventing pollutants in the upper soil and groundwater from communicating with the lower stratum, and effectively preventing pollutants from flowing between the upper and lower strata, by first drilling a large-diameter hole in the upper contaminated rock and soil, setting an isolation casing and adopting a water-stopping cementing layer to stop the water from cementing the well, and then opening a small-diameter hole and lowering a pumping hole well pipe. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:
[0016] Figure 1 It is a schematic diagram of the anti-pollution layered underground water pumping well structure in an embodiment of the utility model.
[0017] In the figure: 1, large diameter hole; 2, contaminated soil / aquifer; 3, pressurized aquifer; 4, isolation casing; 5, water-stopping cementing layer; 6, small diameter hole; 7, pumping hole well pipe; 701, well wall pipe section; 702, water filter pipe section; 703, sedimentation pipe section; 8, filler layer; 801, gravel filling layer; 802, sealing layer. DETAILED DESCRIPTION
[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0019] like Figure 1 As shown, the anti-pollution layered underground pumping well structure in this embodiment includes a large diameter hole 1, an isolation casing 4, a water-stopping cementing layer 5, a small diameter hole 6, a pumping hole well pipe 7 and a filler layer 8. The large diameter hole 1 is opened from the ground to below the contaminated soil / aquifer 2, and is opened to above the confined aquifer 3. Preferably, the bottom of the large diameter hole 1 is located less than 1m below the contaminated soil / aquifer 2. The isolation casing 4 is arranged in the large diameter hole 1, at the same height as the large diameter hole 1, and the lower end extends to the bottom of the large diameter hole 1. The outer diameter of the isolation casing 4 is smaller than the inner diameter of the large diameter hole 1. A water-stopping cementing layer 5 is arranged between the outer wall of the isolation casing 4 and the wall of the large-diameter hole 1. Specifically, the water-stopping cementing layer 5 is formed by grouting silicate cement. Preferably, P32.5 grade silicate cement is used. Cement slurry is injected from the bottom of the isolation casing 4 to the outside of the pipe. The density of the cement slurry is not less than 1.75g / cm3, and the waiting time is not less than 24h.
[0020] A small diameter hole 6 is provided below the large diameter hole 1, and the small diameter hole 6 is provided from the bottom of the large diameter hole 1 to the confined aquifer 3, and the small diameter hole 6 is coaxially arranged with the large diameter hole 1, and the outer diameter of the small diameter hole 6 is smaller than the inner diameter of the large diameter hole 1. The pumping hole well pipe 7 is arranged in the isolation casing 4 and the small diameter hole 6, extending from the ground to the bottom of the small diameter hole 6, and the pumping hole well pipe 7 is coaxially arranged with the isolation casing 4 and the small diameter hole 6. The packing layer 8 is arranged between the outer wall of the pumping hole well pipe 7 and the inner wall of the isolation casing 4 and the hole wall of the small diameter hole 6.
[0021] In this embodiment, the pumping hole well pipe 7 is composed of a well wall pipe section 701, a water filter pipe section 702 and a sedimentation pipe section 703 from top to bottom. The water filter pipe section 702 is provided with a water filter hole and is wrapped with a filter cloth, and the filter cloth is a 40-60 mesh gauze. The well wall pipe section 701 and the sedimentation pipe section 703 are both solid pipes. The well wall pipe section 701, the water filter pipe section 702 and the sedimentation pipe section 703 are connected by welding or special joints to ensure good sealing. The material of the pumping hole well pipe 7 is any one of steel, cast iron, PVC, UPVC, PP, PE, and MPP.
[0022] In this embodiment, the packing layer 8 includes a gravel filling layer 801 and a sealing layer 802 from bottom to top. The gravel filling layer 801 is selected from quartz sand of the same grade according to the sand particle gradation of the aquifer for pumping water, and the thickness of the gravel filling layer 801 is greater than 100 mm. The gravel filling layer 801 is filled at 120%-130% of the thickness of the three layers of the pressure aquifer from the bottom of the well to the top of the water filter section 702. The middle and lower parts of the sealing layer 802 are made of high-quality clay blocks, and clay is used between the top 50 cm from the ground and the ground, and is compacted in layers to prevent ground sewage from seeping in and polluting groundwater.
[0023] In this embodiment, the inner diameter of the large diameter hole 1 is 350 mm, the isolation casing 4 is a 273 mm steel pipe, the inner diameter of the small diameter hole 1 is 240 mm, and the pumping hole well pipe 7 is made of a 146 mm steel pipe.
[0024] The construction process of the anti-pollution layer underground pumping well structure in this embodiment is:
[0025] (1) When drilling begins, a pumping hole with a diameter of 89 mm is drilled and cored. Drilling is stopped when the hole reaches 1 m below the second layer of the upper contaminated soil / aquifer. The hole is expanded to a diameter of 350 mm to form a large-diameter hole 1. After the expansion is completed, a 273 mm isolation casing 4 is inserted. P32.5 grade silicate cement is used between the wall of the large-diameter hole 1 and the isolation casing 4 for water-stopping and cementing.
[0026] (2) For the secondary drilling, a Ø89 mm drill is used for core sampling and recording. When the target layer is reached, the drilling is stopped and the hole is expanded to a Ø240 mm to form a small-diameter hole 6. After the hole is expanded, a Ø146 mm pumping hole well pipe 7 is inserted. The water filter pipe section 702 is made on site according to the site conditions and wrapped with 40-60 mesh gauze. The sedimentation pipe section 703 and the water stop pipe section are all made of solid pipes. The pipe sections are connected by welding or special joints to ensure good sealing.
[0027] (3) Gravel filling: according to the sand particle gradation of the aquifer for pumping, select quartz sand of the same gradation, and the gravel filling thickness should be greater than 100mm. The gravel filling thickness should be filled from the bottom of the well to the top of the filter pipe. The thickness of the three layers of the pressure aquifer should be 120-130%. During the gravel filling process, measure while throwing gravel until the gravel reaches the designed depth to prevent bridging in the middle. Use dynamic water to throw gravel. Before throwing gravel, calculate the amount of gravel, adjust the pump volume, throw gravel evenly and continuously, and measure the gravel throwing position at any time.
[0028] (4) Sealing and water stopping: Use high-quality clay blocks to seal the hole section above the water stop section to the surface. During the backfilling process, measure the backfill height and clear the bridge in time if found. The ground around the wellhead should be filled solidly. When sealing the hole, use clay at a distance of 50 cm from the hole mouth, and tamp it layer by layer every 20 cm to prevent ground sewage from seeping in and polluting groundwater.
[0029] (5) Well washing: After the well is completed, a submersible pump is used to wash the well until the water volume and water level are stable, the water path of the filter pipe is unobstructed, and the mud sediment is ≤0.1‰. The well is considered to be washed successfully.
[0030] The anti-pollution layer-crossing underground pumping well structure in this embodiment can achieve the purpose of isolating pollutants in the upper soil and groundwater by first drilling the upper polluted rock and soil to open a large-diameter hole 1, setting an isolation casing 4 and using a water-stopping cementing layer 5 to stop water cementing, and then opening a small-diameter hole 6 and inserting a pumping hole well pipe 7, so that the pollutants in the upper soil and groundwater cannot communicate with the lower strata, and the pollutants can be effectively prevented from being connected to the upper and lower layers. The two-opening drilling method can ensure that the well formation of the lower part is not affected under the premise of the upper casing. The large-diameter hole 1 has a diameter of 350mm and the isolation casing 4 has a diameter of 273mm. Drilling the lower strata in the isolation casing 4 can be achieved. This well formation method can well prevent the upper and lower pollutants from being connected to the layers, and can be widely used in site investigation and pollution remediation evaluation projects to prevent the pollution of deep groundwater caused by artificial construction.
[0031] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.
Claims
1. An anti-pollution layer underground pumping well structure, characterized in that: include: A large diameter hole (1), the large diameter hole (1) is opened from the ground to below the contaminated soil / aquifer (2) and is located above the confined aquifer (3); An isolation sleeve (4), the isolation sleeve (4) being arranged in the large-diameter hole (1) and having the same height as the large-diameter hole (1), and the outer diameter of the isolation sleeve (4) being smaller than the inner diameter of the large-diameter hole (1); A water-stopping cementing layer (5), wherein a water-stopping cementing layer (5) is provided between the outer wall of the isolation casing (4) and the hole wall of the large-diameter hole (1); A small-diameter hole (6), the small-diameter hole (6) is opened from the bottom of the large-diameter hole (1) to the confined aquifer (3), the small-diameter hole (6) is coaxially arranged with the large-diameter hole (1), and the outer diameter of the small-diameter hole (6) is smaller than the inner diameter of the large-diameter hole (1); A water pumping hole well pipe (7), wherein the water pumping hole well pipe (7) is arranged in the isolation casing (4) and the small-diameter hole (6), and is coaxially arranged with the isolation casing (4) and the small-diameter hole (6); A packing layer (8), the packing layer (8) being arranged between the outer wall of the pumping hole well pipe (7), the inner wall of the isolation casing (4) and the hole wall of the small-diameter hole (6).
2. The anti-pollution layer underground pumping well structure according to claim 1 is characterized in that: The lower ends of the large-diameter hole (1) and the isolation sleeve (4) are located less than 1 m below the contaminated soil / aquifer (2).
3. The anti-pollution layer underground pumping well structure according to claim 1 or 2, characterized in that: The material of the isolation sleeve (4) is any one of steel, cast iron, PVC, UPVC, PP, PE, and MPP.
4. The anti-pollution layered underground pumping well structure according to claim 1 or 2, characterized in that: The water-stopping cementing layer (5) is formed by grouting silicate cement.
5. The anti-pollution layered underground pumping well structure according to claim 1 or 2, characterized in that: The water pumping hole well pipe (7) comprises, from top to bottom, a well wall pipe section (701), a water filter pipe section (702) and a sedimentation pipe section (703), wherein the water filter pipe section (702) is provided with water filter holes and is wrapped with filter cloth.
6. The anti-pollution layer underground pumping well structure according to claim 5 is characterized in that: The filler layer (8) includes a gravel filling layer (801) and a sealing layer (802) from bottom to top, and the gravel filling layer (801) is filled at 120%-130% of the thickness of the pressure aquifer (3) from the bottom of the well to the top of the water filter pipe section (702).
7. The anti-pollution layered underground pumping well structure according to claim 1 or 2, characterized in that: The material of the water pumping hole well pipe (7) is any one of steel, cast iron, PVC, UPVC, PP, PE, and MPP.
8. The anti-pollution layer underground pumping well structure according to claim 6 is characterized in that: The gravel filling layer (801) is filled with quartz sand.