Deep well dewatering and water filtering device

Abstract

The utility model discloses a deep well dewatering and water filtering device which comprises a gravel immersed tube, first water filtering holes are evenly distributed in the bottom and the circumferential direction of the gravel immersed tube, and gravel is filled in the gravel immersed tube; the upper end and the lower end of the sand setting pipe are provided with a reinforcing mesh filter layer and a reinforcing permeable layer respectively. Second water filtering holes are formed in the circumferential direction of the water filtering pipe; the diameter of the wall protecting cylinder is larger than that of the water filtering pipe, the sand setting pipe and the gravel sinking pipe; wherein the water filtering pipe, the sand setting pipe and the gravel sinking pipe are sequentially connected in a sealed mode from top to bottom to form a vertically-communicated dewatering well, the dewatering well is communicated with the lower portion of the wall protecting cylinder, and the wall protecting cylinder and the dewatering well are both arranged underground. The utility model aims to meet the excavation and installation requirements of the strong water-rich semi-diagenesis silty stratum, improve the applicability to the dewatering of the strong water-rich semi-diagenesis silty stratum, effectively filter silt and prevent blockage, and improve the water pumping and dewatering effect of the dewatering well.

Description

Technical Field

[0001] This utility model belongs to the field of groundwater dewatering technology, and more specifically, it relates to a deep well dewatering and filtration device. Background Technology

[0002] In the field of tunnel construction, as construction projects continue to expand into areas with complex geological conditions, highly water-rich semi-indigenous silty sand strata have become a major challenge for tunnel construction. As pointed out in the existing technology of a pre-drainage device and method for tunnel construction in highly water-rich semi-indigenous silty sand strata (publication number CN118757219A), semi-indigenous rocks are prone to softening and disintegration when exposed to water. During tunnel construction in highly water-rich semi-indigenous silty sand strata, geological disasters such as water inrush, sand surge, and collapse occur frequently. The pre-drainage technology proposed in the existing technology has solved some of the problems in tunnel construction to a certain extent. By using pipe jacking technology to pre-penetrate the strata, grouting reinforcement, and deploying vertical drainage pipes, the groundwater level is lowered, geological disasters are prevented, and construction safety and progress are ensured.

[0003] However, this technology still has some limitations. On the one hand, its device structure and construction process are closely designed for tunnel construction, making it difficult to directly apply in other engineering fields requiring dewatering, such as dewatering of large building foundation pits and underground parking lot construction, and its adaptability to different geological formations needs to be expanded. On the other hand, the measures for filtering sediment and preventing pipe blockage during the dewatering process are not perfect enough, and long-term operation may lead to problems such as poor drainage and pump damage, affecting the dewatering effect and construction efficiency.

[0004] Furthermore, in practical engineering, besides tunnel construction, many scenarios face the need for dewatering in highly water-rich semi-formed silty sand strata. For example, in the construction of underground infrastructure in some cities, traditional dewatering methods are ineffective due to high groundwater levels and complex geological formations. Therefore, developing a more versatile dewatering device that can effectively filter sediment and prevent clogging is of significant practical importance. Utility Model Content

[0005] One object of this invention is to solve at least the aforementioned defects and to provide at least the advantages described below.

[0006] This utility model provides a deep well dewatering and filtration device, which aims to meet the excavation and installation requirements of highly aquifer-rich semi-formed silty sand strata, improve the applicability of dewatering in highly aquifer-rich semi-formed silty sand strata, effectively filter mud and sand and prevent clogging, thereby improving the pumping and dewatering effect of the dewatering well.

[0007] This utility model provides a deep well dewatering and filtration device, which includes:

[0008] The crushed stone submerged pipe has first filter holes distributed at the bottom and around the perimeter, and is filled with crushed stone.

[0009] The sedimentation pipe is equipped with a steel mesh filter layer and a steel permeable layer at its upper and lower ends, respectively.

[0010] The filter pipe has a second filter hole around its circumference;

[0011] The diameter of the wall-protecting cylinder is larger than that of the filter pipe, the sand settling pipe and the gravel settling pipe;

[0012] The filter pipe, sand settling pipe, and gravel settling pipe are sequentially and sealed from top to bottom to form a dewatering well that is connected vertically. The dewatering well is connected to the bottom of the protective wall cylinder. Both the protective wall cylinder and the dewatering well are located underground.

[0013] Preferably, the steel mesh filter layer is located at the upper end of the sedimentation pipe, and the steel permeable layer is located at the lower end of the sedimentation pipe. The steel permeable layer is composed of several transverse steel bars arranged to form a grid structure, and the spacing of the grid is smaller than the particle size of the crushed stone in the crushed stone sedimentation pipe.

[0014] Preferably, the wall-protecting cylinder, filter pipe, sand settling pipe, and gravel settling pipe are all made of steel structure.

[0015] Preferably, it also includes a waterproof layer, which is cohesive soil that seals and fills the space between the outer wall of the retaining cylinder and the underground soil layer.

[0016] Preferably, it also includes a gravel filling layer, which is densely filled between the outer wall of the dewatering well and the underground soil layer, forming a first layer of filtration for the groundwater entering the filter pipe.

[0017] Preferably, it also includes multiple ribs and retaining hoops, the multiple ribs being spaced apart and vertically distributed around the periphery of the filter pipe, and the retaining hoops being spirally wound around the ribs to form a second layer of filter screen.

[0018] Preferably, the second filter hole of the filter pipe is a plum blossom-shaped filter hole.

[0019] Preferably, the sedimentation pipe has no filter holes around its circumference.

[0020] This utility model has at least the following beneficial effects:

[0021] First, this utility model, through its construction method of using a retaining wall cylinder, a filter pipe, a sedimentation pipe, and a crushed stone submerged pipe, facilitates installation and is not dependent on specific engineering types. Regardless of the type of water-rich semi-formed silty sand stratum, as long as the steps of first inserting the retaining wall cylinder, excavating, drilling, and then sequentially lowering and connecting the crushed stone submerged pipe, the sedimentation pipe, and the filter pipe are followed, a dewatering well can be constructed to achieve dewatering operations. It can be widely used in scenarios requiring dewatering, such as large building foundation pits, underground parking lots, and urban underground infrastructure construction, greatly expanding the adaptability of geological formations.

[0022] Secondly, this utility model addresses the shortcomings of existing technologies in terms of silt filtration and anti-clogging measures. The device is designed with a first filter hole at the bottom and around the perimeter of the crushed stone sinking pipe, and crushed stone filling the inside to perform initial filtration of the bottom water inlet and increase the water inlet area. The steel mesh filter layer and steel permeable layer at the upper and lower ends of the sinking pipe can effectively store and buffer gravel and fine sand, reduce the risk of clogging, and improve the rainwater drainage effect.

[0023] Third, the combined design of the reinforcing ribs and retaining hoops in this utility model can both create water flow gaps and block sand and soil outside the filter pipe, reducing blockage and improving the precipitation effect.

[0024] Fourth, this utility model effectively solves the problem of sediment by working together through a multi-layered filtration structure, ensuring the long-term smooth flow of rainwater wells and external drainage pipes, and improving the rainwater effect and construction efficiency.

[0025] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0026] Figure 1 This is a vertical cross-sectional schematic diagram of one implementation of the deep well dewatering and filtration device of this utility model;

[0027] Figure 2 This is a schematic diagram of the dewatering well of the deep well dewatering and filtration device of this utility model laid flat.

[0028] Figure 3 This is a schematic diagram of the sedimentation pipe of the deep well dewatering and filtration device of this utility model;

[0029] Figure 4 This is a schematic diagram of the crushed stone submerged pipe of the deep well dewatering and filtration device of this utility model;

[0030] Among them, the wall-protecting cylinder 1; the crushed stone sinking pipe 2; the crushed stone 2-1; the first filter hole 2-2; the filter pipe 3; the second filter hole 3-1; the pad reinforcement 3-2; the retaining hoop 3-3; the sand settling pipe 4; the steel mesh filter layer 4-1; the steel permeable layer 4-2; the gravel filling layer 5; and the water-proof layer 6. Detailed Implementation

[0031] The present invention will be further described in detail below with reference to the embodiments, so that those skilled in the art can implement it based on the description.

[0032] It should be noted that, unless otherwise specified, the experimental methods described in the following embodiments are conventional methods, and the reagents and materials described are commercially available. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "setting" should be interpreted broadly. For example, they can refer to fixed connection or setting, detachable connection or setting, or integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. The terms "lateral," "longitudinal," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0033] Figures 1-4 The implementation of a deep well dewatering and filtration device is shown, which includes:

[0034] The crushed stone submerged pipe 2 has first filter holes 2-2 distributed at its bottom and around its perimeter, and is filled with crushed stone 2-1.

[0035] The sedimentation pipe 4 has a steel mesh filter layer 4-1 and a steel permeable layer 4-2 at its upper and lower ends, respectively.

[0036] The filter pipe 3 has a second filter hole 3-1 around its circumference;

[0037] The diameter of the wall-protecting cylinder 1 is larger than that of the filter pipe 3, the sand settling pipe 4, and the gravel settling pipe 2;

[0038] The filter pipe 3, the sand settling pipe 4, and the gravel settling pipe 2 are sequentially and sealed from top to bottom to form a dewatering well that is connected vertically. The dewatering well is connected to the bottom of the protective wall cylinder 1. Both the protective wall cylinder 1 and the dewatering well are located underground.

[0039] In the above technical solution, the deep well dewatering and filtration device includes a wall-protecting cylinder 1, a filter pipe 3, a sand settling pipe 4, and a crushed stone settling pipe 2. The bottom and circumference of the crushed stone pipe 2 are both provided with first filter holes 2-2, which are tightly filled with crushed stone 2-1. The crushed stone pipe 2 is designed to filter the groundwater entering from the crushed stone pipe 2, increase the water inlet area, and improve the pumping and dewatering efficiency of the dewatering well. The upper and lower ends of the sand settling pipe 4 are respectively provided with a steel mesh filter layer 4-1 and a steel permeable layer 4-2. The sand settling pipe 4 is designed to store and buffer silt and fine sand in the groundwater filtered by the crushed stone pipe 2, as well as store silt and fine sand entering from the circumference of the filter pipe 3. The circumference of the filter pipe 3 is provided with second filter holes 3-1. The filter pipe 3 is designed to filter the groundwater entering the dewatering well from the circumference. The diameter of the retaining wall cylinder 1 is larger than the diameter of the filter pipe 3, the sand settling pipe 4, and the crushed stone pipe 2. The retaining wall cylinder 1 is designed to prevent the hole wall from collapsing during subsequent excavation inside the retaining wall cylinder 1.

[0040] The filter pipe 3, the sand settling pipe 4, and the gravel settling pipe 2 are sequentially and sealed from top to bottom to form a dewatering well that is connected vertically. The dewatering well is connected to the bottom of the protective wall cylinder 1. Both the protective wall cylinder 1 and the dewatering well are located underground. Then, a pumping device is installed on the top of the dewatering well to pump out and dewater the groundwater.

[0041] In use, steel pipes of appropriate diameter and sufficient strength can be selected as filter pipe 3, sedimentation pipe 4, and gravel sedimentation pipe 2. The bottom of gravel sedimentation pipe 2 has evenly distributed first filter holes 2-2 with a diameter of 10mm to 15mm to ensure sufficient water inlet area while preventing excessively large particles from entering the pipe. The inside of gravel sedimentation pipe 2 is filled with clean gravel 2-1 with a particle size of 20mm to 50mm. This gravel 2-1 acts as a preliminary filter, blocking large particles and increasing the channels for groundwater to enter the well, thus improving dewatering efficiency. The upper and lower ends of sedimentation pipe 4 are respectively fixed with a fine steel mesh filter layer 4-1 and a steel permeable layer 4-2. The reinforced permeable layer 4-2 not only prevents gravel 2-1 from entering the settling pipe 4, but also improves the rigidity and stability of the bottom and the filtration effect. The reinforced mesh filter layer 4-1 reduces the upwelling of silt and fine sand in the settling pipe 4, and allows gravel entering the filter pipe 3 to sink and fall into the settling pipe 4, achieving a buffering effect for storing silt and fine sand, thereby reducing the risk of blockage in subsequent filter pipe 3, water pump, external drainage pipe, etc. The filter pipe 3 is made of pipe material with evenly distributed second filter holes 3-1, with a hole diameter of approximately 5mm to 8mm, suitable for filtering gravel while ensuring sufficient permeability. The circumferential design of the second filter holes 3-1 in the filter pipe 3 allows groundwater to freely permeate into the pipe from around the well wall, increasing the pumping area and efficiency of the dewatering well. The retaining wall cylinder 1 is made of steel pipe or precast concrete cylinder with a diameter larger than that of the filter pipe 3, the sand settling pipe 4 and the crushed stone settling pipe 2, to ensure that it can effectively support the surrounding strata and prevent the hole wall from collapsing due to installation or dewatering operations.

[0042] Before constructing the dewatering well, the retaining wall casing 1 is lowered to the predetermined depth to provide a safe working environment for subsequent well excavation. Then, following a bottom-up sequence, the crushed stone casing 2, the sand settling pipe 4, and the filter pipe 3 are sequentially and sealed together to ensure no leakage between components. Using specialized equipment, the entire dewatering well assembly is slowly lowered into the installed retaining wall casing 1 and the borehole below it until the designed depth is reached. Pumping equipment is installed at the top of the dewatering well, and pumping operations are initiated to begin extracting groundwater for dewatering.

[0043] Based on the above implementation, the steel mesh filter layer 4-1 is located at the upper end of the settling pipe 4, and the steel permeable layer 4-2 is located at the lower end of the settling pipe 4. The steel permeable layer 4-2 is composed of several transverse steel bars arranged to form a grid structure, and the spacing of the grid is smaller than the minimum particle size of the crushed stone 2-1 in the crushed stone settling pipe 2. The steel permeable layer 4-2 can both prevent the crushed stone 2-1 from entering the settling pipe 4 and improve the rigidity and stability of the bottom as well as the water permeability. The barrier effect of the steel mesh filter layer 4-1 helps to reduce the upward flow of silt and fine sand in the settling pipe 4, and allows the gravel entering the filter pipe 3 to sink through the mesh and fall into the settling pipe 4, thus achieving a buffering effect for storing silt and fine sand.

[0044] Based on the above implementation method, the wall-protecting cylinder 1, the water filter pipe 3, the sand settling pipe 4, and the gravel settling pipe 2 are all made of steel structure.

[0045] Based on the above implementation, a water-proof layer 6 is also included. The water-proof layer 6 is cohesive soil, which is used to seal and fill the space between the outer wall of the retaining wall cylinder 1 and the underground soil layer. (The sealing and filling of the water-proof layer 6 with cohesive soil can prevent mud and underground sewage from flowing out of the gap and polluting the surface environment during pumping. In addition, high-quality clay is used to seal the gap between the dewatering well and the retaining wall cylinder 11 to prevent mud and underground sewage from flowing out of the gap and polluting the environment during pumping.)

[0046] Based on the above implementation, a gravel-filling layer 5 is also included. The gravel-filling layer 5 is densely filled between the outer wall of the dewatering well and the underground soil layer, forming a first layer of filtration for the groundwater entering the filter pipe 3. The distance between the outer wall of the dewatering well and the underground soil layer can be 1~1.5m, so that the gravel-filling layer 5, which fills the space between the outer wall of the dewatering well and the underground soil layer, reaches a thickness of 1~1.5m.

[0047] Based on the above implementation, it also includes multiple ribs 3-2 and baffles 3-3. The multiple ribs 3-2 are spaced apart and vertically distributed around the water filter pipe 3. The baffles 3-3 are spirally wound around the ribs 3-2 to form a second layer of filter screen (which can both form water flow gaps and block small-sized sand and gravel outside the water filter pipe 3).

[0048] In practical engineering applications, multiple support ribs 3-2 are spaced apart and vertically distributed around the filter pipe 3. The spacing between them needs to be determined comprehensively based on factors such as filtration requirements and the particle size distribution of sand, gravel, and soil. Extensive practical verification has shown that when the diameter of the filter pipe 3 is 168mm, 11 support ribs 3-2 evenly distributed with a spacing of approximately 48mm is suitable. This spacing ensures that the support ribs 3-2 provide stable support for the filter pipe 3, ensuring the stability of the filtration structure, and also effectively works with the retaining rings 3-3 to intercept sand, gravel, and soil. The retaining rings 3-3 are spirally wound around the support ribs 3-2. The spiral spacing of these rings also takes into account filtration accuracy and water flow rate; a spiral spacing of 1-5cm is reasonable. If the spiral spacing is too large, some smaller-diameter sand, gravel, and soil may bypass the retaining rings 3-3 and enter the filter pipe 3; while if the spiral spacing is too small, it may affect water flow efficiency and increase water flow resistance. When the spiral spacing of the retaining ring 3-3 is in the range of 1~5cm, it can effectively block sand and gravel soil while maintaining a good water flow rate, so that groundwater can smoothly pass through the second filter hole 3-1 and enter the filter pipe 3, thus achieving the purpose of efficient precipitation.

[0049] Based on the above implementation, the second filter hole 3-1 of the filter pipe 3 is a plum blossom-shaped filter hole. The plum blossom-shaped filter hole design is used to combine the pad rib 3-2 and the retaining hoop 3-3 to form a variety of filter hole shapes, which is conducive to filtering out sand and gravel of different particle sizes, facilitating water flow, and improving the precipitation effect.

[0050] Based on the above implementation, the sedimentation pipe 4 has no through holes in the circumference. This design reduces the disturbance of water flow on the side wall, further facilitates the storage and buffering of fine sand in the sedimentation pipe 4, reduces the impact on the water pump, and also reduces the impact of fine sand deposition on the external drainage pipe.

[0051] The specific implementation steps of this utility model are as follows:

[0052] 1. Prefabricate each well casing according to the design requirements. The diameter of the wall casing 1 is 426mm and the diameter of the dewatering well is 168mm. All of them are made of steel structure.

[0053] 2. Conduct point measurements to determine the well location;

[0054] 3. Based on the determined location, insert the retaining wall cylinder 1 vertically 20m below the ground and ensure that the upper surface of the retaining wall cylinder 1 is not lower than 0.3m below the ground surface. Seal the retaining wall cylinder 1 with cohesive soil to the surrounding ground surface. The retaining wall cylinder 1 serves to prevent the borehole wall from collapsing during subsequent excavation inside the retaining wall cylinder 1. The cohesive soil seal can prevent mud and underground sewage from flowing out from the gaps and polluting the surface environment during pumping.

[0055] 4. The soil inside the retaining wall cylinder 1 is excavated, and the well is drilled vertically along the axis of the retaining wall cylinder 1 to obtain a borehole. Then, the crushed stone pipe 2 is lowered to the predetermined position in the borehole. Then, the lower end of the sand settling pipe 4 is welded to the upper end of the crushed stone pipe 2. After welding, it is lowered to the predetermined depth. Then, the lower end of the filter pipe 3 is welded to the upper end of the sand settling pipe 4. The filter pipe 3, the sand settling pipe 4 and the crushed stone pipe 2 are sequentially spliced ​​together by welding to form a dewatering well and lowered to the design depth.

[0056] 5. Fill the gravel layer 5 with gravel of different sizes from the bottom of the well to the designed height. During the filling process, ensure that no cavities appear and achieve uniform and tight filling, and tightly fill the gap between the outer wall of the dewatering well and the inner wall of the borehole.

[0057] 6. The water-impermeable layer 6 in the area from the gravel layer 5 to the ground surface is filled with high-quality clay.

[0058] 7. Dewatering: Lower the water pump to the preset position above the sedimentation pipe 4 (e.g., 30cm), start the water pump power to pump out the water in the dewatering well and drain it away through the external drainage pipe.

[0059] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. It can be applied to various fields suitable for this utility model. Other modifications can be easily made by those skilled in the art.

Claims

1. A deep well dewatering and filtration device, characterized in that, include: The crushed stone submerged pipe has first filter holes distributed at the bottom and around the perimeter, and is filled with crushed stone. The sedimentation pipe is equipped with a steel mesh filter layer and a steel permeable layer at its upper and lower ends, respectively. The filter pipe has a second filter hole around its circumference; The diameter of the protective wall tube is larger than that of the filter pipe, the sand settling pipe and the gravel settling pipe; The filter pipe, sand settling pipe, and gravel settling pipe are sequentially and sealed from top to bottom to form a dewatering well that is connected vertically. The dewatering well is connected to the bottom of the protective wall cylinder. Both the protective wall cylinder and the dewatering well are located underground.

2. The deep well dewatering and filtration device as described in claim 1, characterized in that, The steel mesh filter layer is located at the upper end of the sedimentation pipe, and the steel permeable layer is located at the lower end of the sedimentation pipe. The steel permeable layer is composed of several transverse steel bars arranged to form a grid structure. The spacing of the grid is smaller than the particle size of the crushed stone in the crushed stone sedimentation pipe.

3. The deep well dewatering and filtration device as described in claim 1, characterized in that, The wall-protecting cylinder, filter pipe, sand settling pipe, and gravel settling pipe are all made of steel structure.

4. The deep well dewatering and filtration device as described in any one of claims 1-3, characterized in that, It also includes a waterproof layer, which is cohesive soil that seals and fills the space between the outer wall of the retaining cylinder and the underground soil layer.

5. The deep well dewatering and filtration device as described in claim 4, characterized in that, It also includes a gravel filling layer, which is densely filled between the outer wall of the dewatering well and the underground soil layer, forming the first layer of filtration for the groundwater entering the filter pipe.

6. The deep well dewatering and filtration device as described in claim 5, characterized in that, It also includes multiple ribs and retaining hoops. The multiple ribs are spaced apart and vertically distributed around the perimeter of the filter pipe, and the retaining hoops are spirally wound around the ribs to form a second layer of filter screen.

7. The deep well dewatering and filtration device as described in any one of claims 1-3 or 5-6, characterized in that, The sedimentation pipe has no through holes in its circumference.

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