Modular structure for deep foundation pit recharge well and construction method

Abstract

The invention discloses a modular structure for a deep foundation pit recharge well and a construction method, and relates to the technical field of building construction, the modular structure comprises a bottom inverted filter cylinder, a standardized well casing, a prefabricated filter unit and a top cover plate, all the parts are modular structures prefabricated in a factory, and the complete recharge well is assembled in a detachable connection mode; the bottom inverted filter cylinder is filled with a graded broken stone inverted filter layer, the prefabricated filter unit comprises a steel reinforcement cage and a nylon filter screen wrapping the steel reinforcement cage, and plum blossom-shaped open holes are formed in the bottom and the side wall of the standardized well casing. Modular design and factory prefabrication production are adopted, all parts are uniform in specification and good in adaptability, rapid splicing is achieved on site in an internal and external thread screwing mode, the tedious on-site machining and step-by-step feeding procedures of a traditional recharge well are greatly simplified, intensive manual operation is reduced, the construction period is shortened, and the construction efficiency is improved. And efficient construction requirements of modern engineering are met.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, specifically to a modular structure and construction method for deep foundation pit recharge wells. Background Technology

[0002] In the process of urban construction, deep foundation pit engineering is a key preliminary stage for projects such as high-rise buildings and underground space development. Its construction safety and surrounding environmental protection have always been core issues of concern in the engineering field. During the excavation of deep foundation pits, in order to ensure the stability of the soil in the construction area, it is often necessary to take dewatering measures to lower the groundwater level. However, excessive drop in the groundwater level can easily cause consolidation and settlement of the surrounding strata, which in turn can cause irreversible damage such as cracking and displacement to nearby buildings, underground pipelines, roads and other infrastructure. In severe cases, it can even endanger public safety. Therefore, when the drop in groundwater level exceeds the safety threshold, groundwater recharge operations are carried out to maintain the dynamic balance of groundwater in the area. This has become an indispensable environmental protection and safety guarantee measure in deep foundation pit engineering.

[0003] The traditional reinjection well construction process commonly used in the industry currently includes the following core steps: on-site positioning → borehole drilling → bottom cleaning and filter section feeding → reinforcement cage fabrication and installation → reinforcement cage outer filter screen wrapping → reinforcement cage hoisting → side filter section feeding → borehole sealing. However, this process has gradually revealed several prominent problems in long-term application.

[0004] Firstly, the procedures are cumbersome and the process is lengthy. Traditional processes involve multiple on-site processing and step-by-step material feeding. The connection between each process relies on intensive manual operation, which not only extends the construction period but also increases the difficulty of coordinated operation in each stage, making it difficult to meet the needs of efficient construction in modern engineering.

[0005] Secondly, the construction quality is unstable. Key processes such as steel cage fabrication, filter mesh wrapping, and reverse filter material feeding are all completed on the construction site. Affected by factors such as the working environment and the difference in workers' technical level, problems such as steel cage size deviation, incomplete filter mesh wrapping, and uneven gradation of reverse filter material are prone to occur, resulting in poor permeability of the reinjection well, unstable filtration effect, and even blockage of the filter layer during reinjection, affecting reinjection efficiency and project safety.

[0006] Third, there is significant waste of resources and environmental pressure. The core components of traditional reinjection wells, such as steel cages and filter screens, are mostly for single use and cannot be recycled and reused after the project is completed. This not only significantly increases the cost of engineering materials but also generates a large amount of construction waste, which contradicts the current concept of green, low-carbon, and sustainable development in the construction industry.

[0007] Fourth, the construction safety risks are relatively high. In traditional processes, the steel cage and other components are heavy, and the equipment requirements during hoisting are high. In addition, multiple processes are carried out on site, which can easily lead to safety hazards such as hoisting collisions and falling objects from heights, posing a threat to the personal safety of construction workers. Summary of the Invention

[0008] Based on this, the purpose of the present invention is to provide a modular structure and construction method for deep foundation pit recharge wells, so as to solve the technical problems mentioned in the background art.

[0009] To achieve the above objectives, the present invention provides the following technical solution: a modular structure for deep foundation pit recharge wells, comprising a bottom reverse filter cylinder, a standardized well pipe, a prefabricated filter unit and a top cover plate, wherein each component is a prefabricated modular structure in the factory and is assembled into a complete recharge well through a detachable connection method;

[0010] The bottom filter cylinder is filled with a graded crushed stone filter layer. The prefabricated filter unit includes a steel cage and a nylon filter screen wrapped around the steel cage. The bottom and side walls of the standardized well pipe are provided with quincunx-shaped openings. The quincunx-shaped openings serve as both a groundwater flow channel and a temporary positioning support for hoisting and splicing, ensuring the accuracy of construction docking and the efficiency of water flow.

[0011] The bottom filter cartridge, standardized well pipe, and top cover are all made of high-strength PVC material. The high-strength PVC material has anti-corrosion, anti-aging and pressure-bearing properties. The bottom filter cartridge and the standardized well pipe, the adjacent standardized well pipes, and the standardized well pipe and the top cover are all connected by internal and external thread screwing. The connector is equipped with an O-ring rubber seal inside. The sealing and leakage prevention are achieved by tightening the thread.

[0012] The main reinforcement bars of the steel cage are evenly arranged at equal intervals, and the spiral stirrups are continuously set around the main reinforcement bars to form an integrated and stable support frame to prevent the filter layer from deforming.

[0013] The graded crushed stone filter layer is filled into the bottom filter cylinder during the factory prefabrication stage. The gradation specifications are optimized and matched to achieve efficient filtration of large particles of sand and gravel.

[0014] The nylon filter mesh is tightly wrapped around the outside of the steel cage, and the mesh size is adapted to the fine sand filtration requirements to prevent small particles of impurities from entering the recharge well and causing blockage.

[0015] The prefabricated filter unit and the standardized well casing are detachable, which facilitates later maintenance, replacement and recycling.

[0016] The top cover has an anti-slip structure and a sealing groove on its surface. The sealing groove is compatible with the top of the standardized well pipe, which further improves the sealing effect of the top and prevents people from stepping on it accidentally.

[0017] A construction method for a modular structure used in deep foundation pit recharge wells, the process comprising the following steps:

[0018] S1: Factory prefabrication: The bottom filter cartridge, standardized well pipe, prefabricated filter unit and top cover are produced in the factory according to the design standards. The bottom filter cartridge is filled with graded crushed stone filter layer. During the prefabrication process, the processing accuracy and dimensional consistency of each component are strictly controlled.

[0019] S2: Transportation and stacking: The prefabricated modular components are transported to the construction site using specialized transportation equipment, stacked according to specifications, and protected with protective padding and rain and sun protection measures in the stacking area to prevent damage to the components;

[0020] S3: On-site positioning: Combining the deep foundation pit engineering construction plan, groundwater recharge needs and on-site geological survey data, professional measuring instruments are used to determine the construction location of the recharge well. After marking, the positioning accuracy is checked to ensure that it meets the design requirements.

[0021] S4: Micro pile driver hole drilling: Select a micro pile driver that is suitable for the geological conditions and carry out drilling operations at the positioning location. During the drilling process, control the drilling speed and drilling verticality in real time. After the hole is formed, check the integrity of the hole wall. If there are problems such as collapse or diameter reduction, take reinforcement measures in time to ensure the smooth flow of the hole.

[0022] S5: Module hoisting and splicing: The bottom reverse filter cylinder, standardized well pipe, prefabricated filter unit and top cover are hoisted in sequence using appropriate lifting equipment. They are then spliced ​​section by section using internal and external threaded connections. After each section is spliced, the verticality and the sealing of the connection are checked to ensure there is no risk of leakage.

[0023] S6: Orifice sealing: Use special sealing material to fill the gap between the borehole and the outer wall of the reinjection well. During the filling process, compact the material in layers to ensure a dense filling. After sealing, perform functional checks such as water flow test on the reinjection well to verify the smoothness and sealing reliability of the filtration system.

[0024] In summary, the present invention has the following main beneficial effects:

[0025] 1. This invention adopts modular design and factory prefabrication, with uniform specifications and good compatibility of each component. On-site assembly is achieved through internal and external threaded connection, which greatly simplifies the cumbersome on-site processing and step-by-step feeding process of traditional reinjection wells, reduces labor-intensive operations, shortens the construction cycle, and meets the needs of efficient construction in modern engineering.

[0026] 2. The core components of this invention, as well as the graded crushed stone filter layer, nylon filter screen, and other filter structures, are all prefabricated and quality controlled in the factory. This avoids the impact of environmental and personnel technical differences on on-site operations, effectively solves problems such as steel cage size deviation and incomplete filter layer wrapping, ensures stable permeability, durability, and filtration effect of the reinjection well, reduces the risk of filter layer blockage, and ensures project safety.

[0027] 3. The components of this invention are detachable and reusable, changing the traditional single-use model of reinjection well components, significantly reducing engineering material costs, reducing construction waste generation, and conforming to the green, low-carbon, and sustainable development concept of the construction industry;

[0028] 4. The standardized well pipe and other components of this invention are made of high-strength PVC material, which significantly reduces the weight compared to traditional stainless steel materials, reduces the requirements for hoisting equipment and the difficulty of operation, reduces the safety hazards caused by multiple cross-operations, and provides more reliable protection for the personal safety of construction personnel. Attached Figure Description

[0029] Figure 1 This is a cross-sectional view of the recharge well structure of the present invention.

[0030] In the diagram: 1. Bottom filter cartridge; 2. Standardized well casing; 3. Prefabricated filter unit; 4. Top cover plate; 5. Nylon filter screen; 6. Graded crushed stone filter layer. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0032] The embodiments of the present invention will now be described.

[0033] Example 1

[0034] like Figure 1 As shown, this embodiment discloses a standardized and modular recharge well structure and construction method for deep foundation pits, aiming to solve the problems of cumbersome construction procedures, inconsistent construction quality, and non-recyclable raw materials in traditional recharge well construction. The following is a detailed description of the specific construction process.

[0035] The recharge well in this embodiment adopts a standardized and modular design, and is assembled from four core components. Each component is prefabricated in the factory, specifically including:

[0036] Bottom filter cartridge 1: Made of high-strength PVC material, pre-filled with graded crushed stone filter layer 6, used for preliminary filtration of groundwater, preventing large particles of sand and gravel from entering the recharge well, laying the foundation for subsequent filtration stages;

[0037] Standardized well pipe 2: Made of high-strength PVC material in one piece, it effectively reduces its weight compared to traditional stainless steel, making it easier to hoist and assemble on site, while also improving the safety factor during construction. The bottom and side walls of standardized well pipe 2 are provided with quincunx-shaped openings, which can not only ensure smooth flow of groundwater, but also serve as temporary positioning fulcrums during hoisting and assembly to assist in the precise connection of various components.

[0038] Prefabricated filter unit 3: The internal support structure is a steel cage. The main bars of the steel cage are arranged at equal intervals, and the spiral hoops are set around the main bars to form a stable frame structure, which can effectively prevent the filter layer from deforming during use. Nylon filter screen 5 is wrapped around the outside of the steel cage. The nylon filter screen 5 can perform secondary filtration of small particles such as fine sand, further improving the filtration effect and avoiding blockage inside the reinjection well.

[0039] Top cover plate 4: Made of high-strength PVC material, it is used to seal the top of the recharge well to prevent debris from entering the well and affecting the recharge effect, while ensuring the safety of the construction area;

[0040] The connections between the above components are made by internal and external thread screwing. An O-ring rubber seal is installed inside the connector. The pressure of tightening the threads makes the O-ring rubber seal fit tightly against the connection surface, achieving a reliable leak-proof seal and ensuring that water will not leak from the connection during the recharge process.

[0041] Construction methods and steps

[0042] Factory prefabrication and transportation: According to the design standards, the bottom reverse filter cartridge 1, standardized well pipe 2, prefabricated filter unit 3, and top cover plate 4 are produced in the factory. During the production process, the quality of materials and processing precision are strictly controlled to ensure that the dimensions of each module are uniform and the compatibility is good. After production, each module is transported to the construction site by special transportation equipment, and stacked according to specifications with protective measures to avoid damage to the components.

[0043] On-site measurement and positioning: Based on the construction plan of the deep foundation pit project and the groundwater recharge requirements, combined with the on-site geological survey data, professional measuring instruments are used to determine the specific construction location of the recharge well, mark it and check the positioning accuracy to ensure that the location of the recharge well meets the design requirements and can effectively play the role of recharge;

[0044] Miniature pile driver hole drilling: Select a suitable miniature pile driver to carry out drilling operations at the pre-positioned location. During the drilling process, control the drilling speed and verticality, and adjust the drilling parameters according to the geological conditions to ensure that the drilling quality meets the installation requirements of the reinjection well. After the hole is formed, inspect the hole wall. If there are problems such as collapse or narrowing, deal with them in time to ensure that the hole is unobstructed.

[0045] Module segmented hoisting and splicing: The bottom reverse filter cylinder 1 is slowly hoisted into the borehole using lifting equipment, and its position is adjusted to keep it vertical and stable; then the first section of standardized well pipe 2 is hoisted, and the lower end of the standardized well pipe 2 is connected to the upper end of the bottom reverse filter cylinder 1 by internal and external thread screwing. After tightening, the sealing of the connection is checked.

[0046] According to the design depth of the reinjection well, the subsequent standardized well pipes 2 are hoisted in sequence and spliced ​​section by section. The verticality and sealing of each spliced ​​section must be checked. After the standardized well pipes 2 are spliced, the prefabricated filter unit 3 is hoisted and installed in the designated position inside the standardized well pipes 2, ensuring that the installation is firm and the filter surface is unobstructed. Finally, the top cover plate 4 is hoisted and threadedly connected to the topmost standardized well pipe 2 to complete the assembly of the entire reinjection well.

[0047] Orifice sealing: After all modules of the recharge well are assembled and in place, the gap between the borehole and the outer wall of the recharge well is filled and sealed with special sealing material. During the sealing process, it is ensured that the filling is dense to prevent groundwater from seeping from the gap, and at the same time to prevent debris from entering the gap and affecting the stability of the recharge well. After sealing, a simple functional check is performed on the recharge well to ensure that the connection of each component is reliable and the filtration system is unobstructed.

[0048] This embodiment achieves standardized specifications for all components through standardized design, simplifies construction procedures through modular assembly, ensures construction quality through factory prefabrication, and allows each component to be disassembled and reused, effectively reducing construction costs and the amount of construction waste generated, thus demonstrating significant practicality and environmental benefits.

[0049] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the invention and are not intended to limit it. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the invention, but such modifications, substitutions, and variations are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A modular structure for deep foundation pit recharge wells, characterized in that, It includes a bottom reverse filter cartridge (1), a standardized well pipe (2), a prefabricated filter unit (3) and a top cover plate (4). Each component is a modular structure prefabricated in the factory and is assembled into a complete reinjection well through a detachable connection method. The bottom filter cylinder (1) is filled with a graded crushed stone filter layer (6), the prefabricated filter unit (3) includes a steel cage and a nylon filter screen (5) wrapped around the steel cage, and the bottom and side walls of the standardized well pipe (2) are provided with plum blossom-shaped openings.

2. The modular structure for deep foundation pit recharge wells according to claim 1, characterized in that: The bottom filter cylinder (1), the standardized well pipe (2), and the top cover plate (4) are all made of high-strength PVC material, which has anti-corrosion, anti-aging and pressure-bearing properties.

3. The modular structure for deep foundation pit recharge wells according to claim 1, characterized in that: The main reinforcing bars of the steel cage are evenly arranged at equal intervals, and spiral hoops are continuously arranged around the main reinforcing bars to form an integrated and stable support frame to prevent the filter layer from deforming.

4. The modular structure for deep foundation pit recharge wells according to claim 1, characterized in that: The bottom filter cylinder (1) is connected to the standardized well pipe (2), the adjacent standardized well pipes (2) are connected to each other, and the standardized well pipe (2) is connected to the top cover plate (4) by internal and external thread screwing. The connector is equipped with an O-ring rubber seal inside, and the sealing and leakage prevention are achieved by tightening the thread.

5. The modular structure for deep foundation pit recharge wells according to claim 1, characterized in that: The plum blossom-shaped opening serves a dual function as a groundwater flow channel and a temporary positioning support for hoisting and splicing, ensuring the accuracy of construction connections and the efficiency of water flow.

6. The modular structure for deep foundation pit recharge wells according to claim 1, characterized in that: The graded crushed stone filter layer (6) is filled inside the bottom filter cylinder (1) during the factory prefabrication stage. The gradation specifications are optimized and matched to achieve efficient filtration of large particles of sand and gravel.

7. The modular structure for deep foundation pit recharge wells according to claim 1, characterized in that: The nylon filter mesh (5) is tightly wrapped around the outside of the steel cage. The mesh size is adapted to the fine sand filtration requirements to prevent small particles of impurities from entering the recharge well and causing blockage.

8. The modular structure for deep foundation pit recharge wells according to claim 1, characterized in that: The prefabricated filter unit (3) and the standardized well pipe (2) are detachable, which facilitates later maintenance, replacement and recycling.

9. The modular structure for deep foundation pit recharge wells according to claim 1, characterized in that: The top cover plate (4) is provided with an anti-slip structure and a sealing groove. The sealing groove is adapted to the top of the standardized well pipe (2) to further improve the top sealing effect and prevent personnel from accidentally stepping on it.

10. A construction method for a modular structure used in deep foundation pit recharge wells, characterized in that... The construction process using the modular structure for deep foundation pit recharge wells as described in any one of claims 1-9 includes the following steps: S1: Factory prefabrication: The bottom filter cylinder (1), standardized well pipe (2), prefabricated filter unit (3), and top cover plate (4) are produced in the factory according to the design standards, and the graded crushed stone filter layer (6) is filled in the bottom filter cylinder (1). During the prefabrication process, the processing accuracy and dimensional consistency of each component are strictly controlled. S2: Transportation and stacking: The prefabricated modular components are transported to the construction site using specialized transportation equipment, stacked according to specifications, and protected with protective padding and rain and sun protection measures in the stacking area to prevent damage to the components; S3: On-site positioning: Combining the deep foundation pit engineering construction plan, groundwater recharge needs and on-site geological survey data, professional measuring instruments are used to determine the construction location of the recharge well. After marking, the positioning accuracy is checked to ensure that it meets the design requirements. S4: Micro pile driver hole drilling: Select a micro pile driver that is suitable for the geological conditions and carry out drilling operations at the positioning location. During the drilling process, control the drilling speed and drilling verticality in real time. After the hole is formed, check the integrity of the hole wall. If there are problems such as collapse or diameter reduction, take reinforcement measures in time to ensure the smooth flow of the hole. S5: Module hoisting and splicing: The bottom reverse filter cylinder (1), standardized well pipe (2), prefabricated filter unit (3), and top cover plate (4) are hoisted in sequence using appropriate hoisting equipment. They are spliced ​​section by section by internal and external thread screwing. After each section is spliced, the verticality and sealing of the connection are checked to ensure that there is no risk of leakage. S6: Orifice sealing: Use special sealing material to fill the gap between the borehole and the outer wall of the reinjection well. During the filling process, compact the material in layers to ensure a dense filling. After sealing, perform functional checks such as water flow test on the reinjection well to verify the smoothness and sealing reliability of the filtration system.

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