Drainage well structure with concrete inner supporting system conversion system and construction technology

Abstract

The invention discloses an unwatering well structure with a concrete inner supporting system conversion system and a construction technology, and particularly relates to the technical field of unwatering wells, the unwatering well structure comprises a permanent outer sleeve, a drawable inner core pipe is embedded in the middle of the permanent outer sleeve, and the permanent outer sleeve and the drawable inner core pipe are fixedly connected through a quick connecting assembly; the pipe wall of the permanent outer casing pipe is provided with water filtering holes in a preset water filtering section, the outer wall of the permanent outer casing pipe is wrapped with a geotechnical cloth filtering layer, a suction mechanism is arranged in the middle of the drawable inner core pipe, and a function conversion executing mechanism is arranged in the middle of the permanent outer casing pipe and the drawable inner core pipe; the permanent outer sleeve serves as a permanent bearing part, the drawable inner core pipe serves as a recyclable temporary function module, quick connection and separation are achieved through the quick connection assembly, smooth and reliable function conversion is achieved through the function conversion executing mechanism and the anchoring wings, and the problems that a traditional precipitation well is single in function and wastes materials are solved.

Description

Technical Field

[0001] This application relates to the field of drainage well technology, and more specifically, to the structure and construction process of drainage wells with a concrete internal support system conversion system. Background Technology

[0002] With the continuous development of urbanization, various deep foundation pit projects are emerging. In these deep foundation pit projects, dewatering is an important technical means to provide a good working environment inside the pit and ensure the stability of the foundation pit. A search revealed that patent publication number CN111218949A discloses a submersible dewatering well structure, comprising at least one dewatering assembly consisting of an upper and lower connected sealing grouting section and a filter section. The filter section employs a prefabricated permeable structure, with its outer diameter slightly smaller than the borehole diameter. The sealing grouting section, located above the filter section, includes a well pipe and an impermeable sealing bag fitted over the well pipe. The sealing bag is sealed and fixed at both ends to the well pipe, and the grouting pipe communicates with the sealing bag. The invention's prefabricated permeable structure in the filter section eliminates the complex process of traditional dewatering wells, which involves drilling holes, embedding filter pipes, filling filter media, and then flushing, thus saving construction costs. It also avoids filter clogging caused by improper construction during backfilling, and the filter section has reliable permeability. The sealing bag used for grouting around the well pipe effectively adheres to the borehole wall under different working conditions, providing a better seal than traditional clay balls and enhancing the airtightness of the well structure. During the development of this application, the inventors discovered the following problems with the existing technology: Traditional dewatering wells are often designed and constructed only for the dewatering stage. The well pipe material is usually abandoned underground after the dewatering task is completed, which not only wastes resources but may also hinder the construction of subsequent foundation pit support structures. The presence of well pipes often requires the support beam reinforcement to be cut off or bypassed, which weakens the integrity of the support structure and increases the complexity of construction. Therefore, a drainage well structure and construction process with a concrete internal support system conversion system are proposed to address the above problems. Application content

[0003] In order to overcome the above-mentioned defects of the prior art, this application provides a drainage well structure and construction process with a concrete internal support system conversion system to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this application provides the following technical solution: a drainage well structure with a concrete internal support system conversion system, including a permanent outer casing, a removable inner core tube embedded in the middle of the permanent outer casing, the permanent outer casing and the removable inner core tube being fixedly connected by a quick-connect assembly, the pipe wall of the permanent outer casing having filter holes in a preset filtration section, the outer wall of the permanent outer casing being wrapped with a geotextile filter layer, a suction mechanism being provided in the middle of the removable inner core tube, an anchoring wing being fixedly connected to the pipe wall of the permanent outer casing, and a function conversion actuator being provided in the middle of the permanent outer casing and the removable inner core tube.

[0005] Preferably, the top of the removable inner core tube is connected to a sealing cap, the bottom of the removable inner core tube is provided with a water inlet, a turbidity sensor is provided in the middle of the water inlet, and a flow meter is provided on one side of the turbidity sensor.

[0006] Preferably, the suction mechanism includes a water suction pipe, a vacuum water pump, and an anti-clogging filter head. The water suction pipe is fixedly connected to one side of the inner wall of the removable inner core tube by a bracket. The top end of the water suction pipe passes through a sealing cap. A vacuum water pump is provided on one side of the sealing cap. The top end of the water suction pipe is connected to the vacuum water pump. The bottom end of the water suction pipe is fixedly connected to an anti-clogging filter head.

[0007] Preferably, a support rod is fixedly connected to the inner wall of the anti-clogging filter head, a linkage shaft is connected to the middle outer wall of the support rod through a bearing, a spiral impeller is fixedly connected to the top outer wall of the linkage shaft, and a cleaning brush is fixedly connected to the end of the linkage shaft away from the spiral impeller, with the cleaning surface of the cleaning brush abutting against the inner wall of the filter end of the anti-clogging filter head.

[0008] Preferably, the function conversion actuator includes an annular tube, a high-frequency vibrator, a micro nozzle, and a high-pressure water pipeline. The annular tube is fixedly connected to the outer wall of the removable inner core tube. The annular tube is disposed between the removable inner core tube and the permanent outer tube. A high-frequency vibrator is fixedly connected to one side of the outer wall of the annular tube. A micro nozzle is connected to the edge of the outer wall of the annular tube. Multiple sets of micro nozzles are arranged at equal intervals. A high-pressure water pipeline is fixedly connected to the top of the annular tube. The top of the high-pressure water pipeline extends to the outside through the sealing cap.

[0009] Preferably, the quick-connect assembly includes a male connector unit, a female connector unit, and a locking groove. The male connector unit is fixedly connected to the bottom of the outer wall of the removable inner core tube, and the female connector unit is fixedly connected to the bottom inner wall of the permanent outer tube. The surface of the female connector unit is provided with a locking groove, and the male connector unit is embedded in the inside of the locking groove.

[0010] Preferably, the construction process includes: Step 1: Measurement and positioning and well drilling. According to the design drawings, the well location is measured and laid out to determine the drainage well location. The drilling rig is used to drill a hole to the design depth, the permanent outer casing is hoisted and inserted, and filter material is backfilled between its outer wall and the hole wall to form a complete well body. Step 2: Inner core tube installation and system connection. The assembled removable inner core tube is hoisted into the permanent outer tube and locked at a preset depth using the quick-connect assembly. The water pumping pipe of the suction mechanism is connected to the vacuum pump, and the sealing cap is installed and airtightness is ensured. Step 3: Dewatering and earthwork excavation. Start the vacuum pump to dewater, and monitor the water output through turbidity sensors and flow meters. After the water level in the pit drops below the safe elevation, carry out layered and segmented earthwork excavation. Step 4: Support conversion preparation and inner core recovery. After excavation to the design bottom elevation of the concrete inner support, stop dewatering, operate the function conversion actuator to vibrate and clear water vapor obstacles, and then use a crane to lift the removable inner core tube, release the locking of the quick-connect assembly, and lift the removable inner core tube out of the well for recovery. Step 5: Support system conversion and structural forming. Tie the steel bars of the concrete inner support beam, reliably weld the main bars to the anchoring wings of the outer wall of the permanent outer sleeve, and pour concrete after formwork to combine the permanent outer sleeve and the concrete inner support beam into an integral load-bearing structure, thus completing the functional conversion.

[0011] Preferably, in step two, the permanent outer casing is hoisted to the center of the borehole and fixed. Then, filter material is backfilled evenly along the annular gap between the outer side of the well casing and the borehole wall. During the backfilling process, the height of the filler is measured in real time to prevent clogging or impact on the well wall. After the filter material is backfilled, the well is washed in sections from top to bottom using an air compressor until the effluent is clear and free of silt. After the well is washed, the integrated pull-out inner core tube is lowered into the permanent outer casing and locked at a preset depth using the quick-connect assembly. The wellhead sealing cap is installed and the vacuum pump pipeline is connected.

[0012] Preferably, in step two, the motor and pump body must be inspected before the vacuum pump is installed. After installation, the power supply is connected to perform a single-well test pumping. The test pumping volume is greater than the design volume. The pressure, water level, and pumping volume data are recorded. The dewatering effect is checked to see if it matches the design. After verification, the group of wells is started for formal dewatering 3 to 7 days before earthwork excavation. The sand content of the effluent is monitored by the turbidity sensor, and the pumping volume is adjusted by the flow meter.

[0013] Preferably, in step four, before the removable inner core tube is retracted, a high-frequency oscillator is activated to generate vibration, followed by the spraying of high-pressure water pulses from a micro-nozzle to clear obstacles. Once the resistance drops to a safe threshold, the tube is then lifted for retraction.

[0014] The technical effects and advantages of this application are as follows: Compared with existing technologies, this dewatering well structure and construction process with a concrete internal support system can be converted into a support structure. When the structure needs to be converted, the functional conversion actuator is activated to assist in the recovery of the inner core tube and to combine the anchoring wing with the subsequently poured concrete, thus completing the functional conversion from dewatering well to support column. This realizes the separation and integration of the dewatering function and the permanent support structure function. The permanent outer tube serves as a durable load-bearing component, while the removable inner core tube serves as a recyclable temporary functional module. Quick connection and separation are achieved through quick-connect components, and a smooth and reliable functional conversion is achieved through the functional conversion actuator and anchoring wing. This solves the problems of single function and material waste in traditional dewatering wells.

[0015] Compared with existing technologies, the drainage well structure and construction process with concrete internal support system has the advantage that when water flows through the anti-clogging filter head, it impacts the spiral impeller to make it rotate. The rotational motion is transmitted to the cleaning brush at the end through the linkage shaft. The cleaning brush rotates accordingly and continuously scrapes the inner wall of the filter end of the anti-clogging filter head to remove mud, sand and biofilm deposits on the filter screen surface, keeping the anti-clogging filter head unobstructed. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this application; Figure 2 This is a schematic diagram of the three-dimensional structure of this application; Figure 3 This is a schematic diagram of the cross-sectional structure of the removable inner core tube in this application; Figure 4 This is a three-dimensional structural diagram of the removable inner core tube of this application; Figure 5 This is a schematic diagram of the quick-connect component structure of this application; Figure 6 This is a schematic diagram of the internal structure of the anti-clogging filter head of this application; Figure 7 This is a schematic diagram of the construction process structure of this application.

[0017] The attached diagram is labeled as follows: 1. Permanent outer sleeve; 2. Removable inner core tube; 201. Inlet; 202. Turbidity sensor; 203. Flow meter; 3. Quick-connect assembly; 301. Male connector unit; 302. Female connector unit; 303. Locking slot; 4. Filter hole; 5. Geotextile filter layer; 6. Suction mechanism; 601. Pumping pipe; 602. Vacuum pump; 603. Anti-clogging filter head; 604. Support rod; 605. Linkage shaft; 606. Spiral impeller; 607. Cleaning brush; 7. Anchoring wing; 8. Function conversion actuator; 801. Ring pipe; 802. High-frequency vibrator; 803. Miniature nozzle; 804. High-pressure water pipeline; 9. Sealing cap. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. Example 1

[0019] As attached Figures 1 to 6 The dewatering well structure shown has a concrete internal support system conversion system, including a permanent outer tube 1, a removable inner core tube 2 embedded in the middle of the permanent outer tube 1, the permanent outer tube 1 and the removable inner core tube 2 are fixedly connected by a quick-connect component 3, the tube wall of the permanent outer tube 1 is provided with filter holes 4 in a preset filter section, the outer wall of the permanent outer tube 1 is wrapped with a geotextile filter layer 5, a suction mechanism 6 is provided in the middle of the removable inner core tube 2, an anchoring wing 7 is fixedly connected to the tube wall of the permanent outer tube 1, and a function conversion actuator 8 is provided in the middle of the permanent outer tube 1 and the removable inner core tube 2.

[0020] In a preferred embodiment, during construction, the permanent outer casing 1 is first buried in the stratum. The filter holes 4 and geotextile filter layer 5 in its filtration section are responsible for introducing and filtering groundwater. Subsequently, the removable inner core tube 2, which integrates a suction mechanism 6, is installed inside the permanent outer casing 1 through a quick-connect assembly 3. The suction mechanism 6 works to discharge the water. When it is necessary to convert it into a support structure, the function conversion actuator 8 is activated to assist in the recovery of the inner core tube and to connect the anchoring wing 7 with the subsequently poured concrete, completing the function conversion from dewatering well to support column. This realizes the separation and integration of the dewatering function and the permanent support structure function. The permanent outer casing 1 serves as a permanent load-bearing component, and the removable inner core tube 2 serves as a recyclable temporary functional module. The quick-connect assembly 3 enables rapid connection and separation, and the function conversion actuator 8 and anchoring wing 7 enable a smooth and reliable function conversion, solving the problems of single function and material waste in traditional dewatering wells.

[0021] The top of the removable inner core tube 2 is connected to a sealing cap 9, the bottom of the removable inner core tube 2 is provided with a water inlet 201, a turbidity sensor 202 is provided in the middle of the water inlet 201, and a flow meter 203 is provided on one side of the turbidity sensor 202.

[0022] In a preferred embodiment, after the removable inner core tube 2 is installed, its bottom inlet 201 is the channel for groundwater to enter the pumping system. During operation, the turbidity sensor 202 monitors the sand content of the incoming water flow in real time, and the flow meter 203 monitors the pumping volume in real time to determine whether the precipitation status is normal, such as whether the filter layer is damaged and whether the pumping efficiency meets the standard. The top sealing cover 9 ensures that the wellhead is sealed and maintains the airtightness required for vacuuming.

[0023] The suction mechanism 6 includes a water suction pipe 601, a vacuum water pump 602, and an anti-clogging filter head 603. The water suction pipe 601 is fixedly connected to one side of the inner wall of the removable inner core tube 2 via a bracket. The top end of the water suction pipe 601 passes through the sealing cover 9. The vacuum water pump 602 is provided on one side of the sealing cover 9. The top end of the water suction pipe 601 is connected to the vacuum water pump 602. The bottom end of the water suction pipe 601 is fixedly connected to the anti-clogging filter head 603.

[0024] In a preferred embodiment, during precipitation, the vacuum pump 602 is started, generating a negative pressure vacuum in the well through the pumping pipe 601. Under the action of pressure difference, the groundwater is filtered by the anti-clogging filter head 603 and then sucked into the pumping pipe 601 and discharged to the ground. The anti-clogging filter head 603 prevents large particles from entering the pipeline and causing blockage. The vacuum pump 602 provides strong suction power, and the anti-clogging filter head 603, as a filtration unit, effectively protects the pump body and pipeline, extends the equipment life, and ensures the continuous and efficient operation of the precipitation system.

[0025] A support rod 604 is fixedly connected to the inner wall of the anti-clogging filter head 603. A linkage shaft 605 is connected to the outer wall of the middle part of the support rod 604 through a bearing. A spiral impeller 606 is fixedly connected to the outer wall of the top of the linkage shaft 605. A cleaning brush 607 is fixedly connected to the end of the linkage shaft 605 away from the spiral impeller 606. The cleaning surface of the cleaning brush 607 abuts against the inner wall of the filter end of the anti-clogging filter head 603.

[0026] In a preferred embodiment, when water flows through the anti-clogging filter head 603, it impacts the spiral impeller 606 to make it rotate. The rotational motion is transmitted to the cleaning brush 607 at the end through the linkage shaft 605. The cleaning brush 607 rotates accordingly and continuously scrapes the inner wall of the filter end of the anti-clogging filter head 603 to remove mud, sand and biofilm deposits on the filter screen surface and keep the anti-clogging filter head 603 unobstructed.

[0027] The function conversion actuator 8 includes an annular tube 801, a high-frequency vibrator 802, a micro nozzle 803, and a high-pressure water pipe 804. The annular tube 801 is fixedly connected to the outer wall of the removable inner core tube 2. The annular tube 801 is located between the removable inner core tube 2 and the permanent outer tube 1. The high-frequency vibrator 802 is fixedly connected to one side of the outer wall of the annular tube 801. The micro nozzle 803 is connected to the edge of the outer wall of the annular tube 801. Multiple sets of micro nozzles 803 are arranged at equal intervals. The high-pressure water pipe 804 is fixedly connected to the top of the annular tube 801. The top of the high-pressure water pipe 804 extends to the outside through the sealing cover 9.

[0028] In a preferred embodiment, when it is necessary to retrieve the removable inner core tube 2, the function conversion actuator 8 is activated. First, the high-frequency oscillator 802 generates high-frequency vibration, disturbing any deposits that may exist in the annular gap between the removable inner core tube 2 and the permanent outer sleeve 1, breaking the static friction. Subsequently, the high-pressure water pipeline 804 delivers high-pressure water to the annular pipe 801 through an external water pump, and sprays it out through the micro nozzle 803 to further flush the annular gap and remove the deposits, creating conditions for the smooth extraction of the inner core tube.

[0029] The quick-connect assembly 3 includes a male connector unit 301, a female connector unit 302, and a locking groove 303. The male connector unit 301 is fixedly connected to the bottom of the outer wall of the removable inner core tube 2, and the female connector unit 302 is fixedly connected to the inner wall of the bottom end of the permanent outer tube 1. The surface of the female connector unit 302 is provided with a locking groove 303, and the male connector unit 301 is embedded in the inside of the locking groove 303.

[0030] In a preferred embodiment, during installation, the male head unit 301 at the bottom of the removable inner core tube 2 is aligned with and embedded into the locking groove 303 of the female head unit 302 at the bottom of the permanent outer tube 1. Mechanical interlocking is achieved by rotation, which completes the quick fixation. During recycling, the reverse operation is performed to release the lock and achieve separation. Example 2

[0031] Based on Example 1, the solution in Example 1 will be further described in detail below with reference to the specific working method, such as... Figures 1 to 7 As shown below, see details: Construction techniques include: Step 1: Measurement and positioning and well drilling. Measure and lay out the well according to the design drawings to determine the drainage well location; use a drilling rig to drill to the design depth, hoist and insert the permanent outer casing 1, and backfill filter material between its outer wall and the borehole wall to form a complete well body; Step 2: Inner core tube installation and system connection. The assembled removable inner core tube 2 is hoisted into the permanent outer tube 1 and locked and fixed at a preset depth using the quick-connect assembly 3. The water pumping pipe 601 of the suction mechanism 6 is connected to the vacuum water pump 602. The sealing cap 9 is installed and airtightness is ensured. Step 3: Dewatering and earthwork excavation. Start the vacuum water pump 602 to dewater. Monitor the water output through the turbidity sensor 202 and the flow meter 203. After the water level in the pit drops below the safe elevation, carry out layered and segmented earthwork excavation. Step 4: Support conversion preparation and inner core recovery. After excavation to the design bottom elevation of the concrete inner support, stop dewatering, operate the function conversion actuator 8 to vibrate and clear water vapor obstacles, and then use a crane to lift the removable inner core tube 2, release the locking of the quick-connect component 3, and lift the removable inner core tube 2 out of the well for recovery. Step 5: Support system conversion and structural forming. Tie the steel bars of the concrete inner support beam, reliably weld the main bars to the anchoring wings 7 on the outer wall of the permanent outer sleeve 1, and pour concrete after formwork to combine the permanent outer sleeve 1 with the concrete inner support beam into an integral load-bearing structure, thus completing the functional conversion.

[0032] In step two, the permanent outer casing 1 is hoisted to the center of the borehole and fixed. Then, filter material is backfilled evenly along the annular gap between the outer side of the well casing and the borehole wall. During the backfilling process, the height of the filler is measured in real time to prevent clogging or impact on the well wall. After the filter material is backfilled, the well is washed in sections from top to bottom using an air compressor until the water is clear and free of mud and sand. After the well is washed, the integrated removable inner core tube 2 is lowered into the permanent outer casing 1 and locked and fixed at a preset depth using the quick-connect assembly 3. The wellhead sealing cover 9 is installed and the vacuum pump 602 pipeline is connected.

[0033] As a preferred implementation, after the permanent outer casing 1 is installed, the filter material is backfilled meticulously and measured in real time to ensure that the filter material is filled evenly and densely to form a good reverse filter layer. Then, an air compressor is used to wash the well in sections until the water is clear and the sand is clean, ensuring that the dewatering channel is unobstructed. Finally, the inner core tube 2 that can be pulled out is installed. The meticulous backfilling of the filter material and the thorough washing of the well are the foundation for ensuring the long-term and efficient operation of the dewatering well. It can effectively prevent the well pipe from being blocked and the water output from being reduced, providing a fundamental guarantee for the subsequent dewatering effect and reflecting the meticulous management of the project quality.

[0034] In step two, before installing the vacuum pump 602, the motor and pump body must be inspected. After installation, the power supply is connected to conduct a single-well test pumping. The test pumping volume is greater than the design volume. The pressure, water level, and pumping volume data are recorded. The dewatering effect is checked to see if it matches the design. After verification, the group of wells is started 3 to 7 days before the earthwork excavation for formal dewatering. The sand content of the effluent is monitored by the turbidity sensor 202, and the pumping volume is adjusted by the flow meter 203.

[0035] As a preferred implementation method, trial sampling can identify and resolve problems in advance, avoiding systematic deviations after the start of full-scale precipitation. Feedback control based on measured data makes precipitation operations more scientific and precise, ensuring the predictability and safety of precipitation effects.

[0036] In step four, before the removable inner core tube 2 is retrieved, the high-frequency oscillator 802 is activated to generate vibration, followed by the spraying of high-pressure water pulses by the micro nozzle 803 to clear obstacles. After the resistance drops to a safe threshold, the top is raised for retrieval.

[0037] As a preferred embodiment, by clearing obstacles first and then lifting, the risks during the recovery process are greatly reduced, effectively preventing equipment damage or well pipe damage caused by excessive resistance, and ensuring the intact recovery of the removable inner core tube 2 and the smooth progress of subsequent steps.

[0038] The working process of this application is as follows: First, the permanent outer casing 1 is buried in the stratum. The filter holes 4 and geotextile filter layer 5 in its filtration section are responsible for introducing and filtering groundwater. Then, the removable inner core tube 2, which integrates the suction mechanism 6, is installed inside the permanent outer casing 1 through the quick-connect assembly 3. When the suction mechanism 6 is working, the vacuum pump 602 is started during precipitation. A negative pressure vacuum is generated in the well through the pumping pipe 601. Under the action of pressure difference, the groundwater is filtered by the anti-clogging filter head 603 and then sucked into the pumping pipe 601 and discharged to the ground. The anti-clogging filter head 603 prevents large particles from entering the pipeline and causing blockage. The vacuum pump 602 provides strong suction power. The anti-clogging filter head 603, as a filtration unit, effectively protects the pump body and pipeline, extends the equipment life, and ensures the continuous and efficient operation of the precipitation system. When supporting the structure, the function conversion actuator 8 is activated to assist in the recovery of the inner core tube and to combine the anchoring wing 7 with the subsequently poured concrete, completing the function conversion from dewatering well to supporting column. This realizes the separation and integration of the dewatering function and the permanent support structure function. When it is necessary to recover the removable inner core tube 2, the function conversion actuator 8 is activated. First, the high-frequency vibrator 802 generates high-frequency vibration, disturbing any silt that may exist in the annular gap between the removable inner core tube 2 and the permanent outer sleeve 1, breaking the static friction. Subsequently, the high-pressure water pipeline 804 delivers high-pressure water to the annular pipe 801 through an external water pump, and sprays it out through the micro nozzle 803 to further flush the annular gap and remove the attached materials, creating conditions for the smooth extraction of the inner core tube. The above is the working principle of the dewatering well structure and construction process with the concrete internal support system conversion system.

Claims

1. A drainage well structure with a concrete internal support system conversion system, including a permanent outer casing (1), characterized in that: The permanent outer tube (1) is embedded in the middle of a removable inner core tube (2). The permanent outer tube (1) and the removable inner core tube (2) are fixedly connected by a quick-connect assembly (3). The tube wall of the permanent outer tube (1) is provided with filter holes (4) in a preset filter section. The outer wall of the permanent outer tube (1) is wrapped with a geotextile filter layer (5). A suction mechanism (6) is provided in the middle of the removable inner core tube (2). An anchoring wing (7) is fixedly connected to the tube wall of the permanent outer tube (1). A function conversion actuator (8) is provided in the middle of the permanent outer tube (1) and the removable inner core tube (2).

2. The dewatering well structure with a concrete internal support system conversion system according to claim 1, characterized in that: The top of the removable inner core tube (2) is connected to a sealing cap (9), the bottom of the removable inner core tube (2) is provided with a water inlet (201), a turbidity sensor (202) is provided in the middle of the water inlet (201), and a flow meter (203) is provided on one side of the turbidity sensor (202).

3. The drainage well structure with a concrete internal support system conversion system according to claim 2, characterized in that: The suction mechanism (6) includes a water suction pipe (601), a vacuum water pump (602), and an anti-clogging filter head (603). The water suction pipe (601) is fixedly connected to one side of the inner wall of the removable inner core tube (2) by a bracket. The top end of the water suction pipe (601) passes through the sealing cover (9). The vacuum water pump (602) is provided on one side of the sealing cover (9). The top end of the water suction pipe (601) is connected to the vacuum water pump (602). The bottom end of the water suction pipe (601) is fixedly connected to the anti-clogging filter head (603).

4. The drainage well structure with a concrete internal support system conversion system according to claim 3, characterized in that: The inner wall of the anti-clogging filter head (603) is fixedly connected to a support rod (604). The middle outer wall of the support rod (604) is connected to a linkage shaft (605) via a bearing. The top outer wall of the linkage shaft (605) is fixedly connected to a spiral impeller (606). A cleaning brush (607) is fixedly connected to the end of the linkage shaft (605) away from the spiral impeller (606). The cleaning surface of the cleaning brush (607) abuts against the inner wall of the filter end of the anti-clogging filter head (603).

5. The drainage well structure with a concrete internal support system conversion system according to claim 3, characterized in that: The function conversion actuator (8) includes an annular tube (801), a high-frequency vibrator (802), a micro nozzle (803), and a high-pressure water pipeline (804). The annular tube (801) is fixedly connected to the outer wall of the removable inner core tube (2). The annular tube (801) is located between the removable inner core tube (2) and the permanent outer tube (1). The high-frequency vibrator (802) is fixedly connected to one side of the outer wall of the annular tube (801). The micro nozzle (803) is connected to the edge of the outer wall of the annular tube (801). The micro nozzle (803) is arranged in multiple sets and is equidistant. The high-pressure water pipeline (804) is fixedly connected to the top of the annular tube (801). The top of the high-pressure water pipeline (804) extends to the outside through the sealing cover (9).

6. The drainage well structure with a concrete internal support system conversion system according to claim 5, characterized in that: The quick-connect assembly (3) includes a male connector unit (301), a female connector unit (302), and a locking groove (303). The male connector unit (301) is fixedly connected to the bottom of the outer wall of the removable inner core tube (2), and the female connector unit (302) is fixedly connected to the inner wall of the bottom end of the permanent outer tube (1). The surface of the female connector unit (302) is provided with a locking groove (303), and the male connector unit (301) is embedded in the locking groove (303).

7. A construction process for a dewatering well with a concrete internal support system conversion system, employing the dewatering well structure with a concrete internal support system conversion system as described in any one of claims 1-6, characterized in that: The construction process includes: Step 1: Measurement and positioning and well construction. According to the design drawings, the well location is measured and laid out to determine the drainage well location. The drilling rig is used to drill the hole to the design depth, and the permanent outer casing (1) is hoisted in and backfilled with filter material between its outer wall and the hole wall to form a complete well body. Step 2: Inner core tube installation and system connection. The assembled removable inner core tube (2) is hoisted into the permanent outer tube (1). It is locked and fixed at a preset depth by the quick-connect assembly (3). The water pumping pipe (601) of the suction mechanism (6) is connected to the vacuum pump (602). The sealing cap (9) is installed and airtightness is ensured. Step 3: Dewatering and earthwork excavation. Start the vacuum pump (602) to dewater. Monitor the water output through the turbidity sensor (202) and flow meter (203). After the water level in the pit drops below the safe elevation, carry out layered and segmented earthwork excavation. Step 4: Support conversion preparation and inner core recovery. After excavation to the design bottom elevation of the concrete inner support, stop dewatering, operate the function conversion actuator (8) to vibrate and clear water vapor obstacles, and then lift the removable inner core tube (2) with a crane, release the locking of the quick-connect assembly (3), and lift the removable inner core tube (2) out of the well for recovery. Step 5: Structure forming, tie the steel bars of the concrete inner support beam, reliably weld the main bars to the anchoring wings (7) on the outer wall of the permanent outer sleeve (1), pour concrete after formwork, so that the permanent outer sleeve (1) and the concrete inner support beam are combined into an integral load-bearing structure, and complete the functional conversion.

8. The construction process of the dewatering well with a concrete internal support system conversion system according to claim 7, characterized in that: In step two, the permanent outer casing (1) is hoisted to the center of the borehole and fixed. Then, filter material is backfilled evenly along the annular gap between the outer side of the well pipe and the borehole wall. During the backfilling process, the height of the filler is measured in real time to prevent clogging or impact on the well wall. After the filter material is backfilled, the well is washed in sections from top to bottom using an air compressor until the water is clear and free of mud and sand. After the well is washed, the pull-out inner core tube (2) is lowered into the permanent outer casing (1) and locked and fixed at a preset depth by the quick-connect assembly (3). The wellhead sealing cap (9) is installed and the vacuum pump (602) pipeline is connected.

9. The construction process of the dewatering well with a concrete internal support system conversion system according to claim 8, characterized in that: In step two, the motor and pump body of the vacuum pump (602) must be checked before installation. After installation, the power supply is connected to perform single-well test pumping. The test pumping volume is greater than the design volume. The pressure, water level and pumping volume data are recorded. The dewatering effect is checked to see if it matches the design. After verification, the group of wells is started 3 to 7 days before the earthwork excavation for formal dewatering. The sand content of the effluent is monitored by the turbidity sensor (202), and the pumping volume is adjusted by the flow meter (203).

10. The construction process of the dewatering well with a concrete internal support system conversion system according to claim 7, characterized in that: In step four, before the removable inner core tube (2) is recovered, the high-frequency vibrator (802) is activated to generate vibration, and then the high-pressure water pulse is sprayed in conjunction with the micro nozzle (803) to clear the obstruction. After the resistance drops to the safety threshold, the top is lifted for recovery.

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