Underground anti-floating structure applied to water-rich area

Abstract

The application discloses an underground anti-floating structure applied to a water-rich area and belongs to the technical field of underground anti-floating structures. The underground anti-floating structure solves the problem that the existing underground anti-floating structure needs to additionally add a driving assembly when soil cleaning is performed on a pressure relief pipe, thereby causing high energy consumption. The underground anti-floating structure comprises the pressure relief pipe, a plurality of water-permeable holes for underground water entering are arranged on the circumferential side wall of the pressure relief pipe, a floating rotary cleaning assembly is vertically arranged in the pressure relief pipe, and the floating rotary cleaning assembly comprises a water pump, a rotary water pipe and an air bag. When soil cleaning is performed on the pressure relief pipe, the underground anti-floating structure does not need to additionally add a driving assembly to provide driving force, and the water pump is used as the only driving part. The water pump not only plays a role in pumping underground water, but also converts part of kinetic energy of the underground water in the pumping process into torque through the rotary water pipe, so that the rotary water pipe is driven to rotate, and soil on the water-permeable hole is cleaned by using the bristles thereon, thereby avoiding that the soil is deposited and hardened on the water-permeable hole, so that underground water is not discharged in time.

Description

Technical Field

[0001] This invention relates to the field of underground anti-buoyancy structure technology, and specifically to an underground anti-buoyancy structure applicable to water-rich areas. Background Technology

[0002] In underground structural engineering, a series of measures must be taken to prevent the underground structure from floating or lifting.

[0003] In the prior art, common reinforcement measures to enhance the structural buoyancy resistance of buildings include setting up anti-buoyancy anchors, increasing the structural weight, constructing underground retaining walls, and establishing drainage systems (setting up drainage systems to ensure that groundwater around underground structures is effectively discharged, reducing the buoyancy impact of groundwater on the structure).

[0004] A Chinese utility model patent with publication number CN214994146U discloses an anti-buoyancy structure for a basement, which includes a basement floor slab and a sump pit. The sump pit contains a drainage assembly, which includes a vertically fixed inlet pipe passing through the bottom wall of the sump pit. The inlet pipe is connected to groundwater below the basement floor slab. The top of the inlet pipe is closed, while the bottom is open. The open portion of the bottom of the inlet pipe is wrapped with gauze to filter the incoming water.

[0005] This patented technology uses a drainage component to achieve self-sealing, thereby limiting the maximum water inflow into the sump and reducing the possibility of groundwater overflowing into the basement. However, over time, soil will gradually accumulate on the gauze, reducing its ability to filter groundwater and potentially leading to delayed groundwater drainage.

[0006] To address the aforementioned issues, patent CN115977168A discloses an anti-buoyancy structure for basements. This structure includes a basement floor slab with multiple water storage tanks. Each tank has a pressure relief pipe extending into the soil, connected to its bottom. The pipe is sealed at the bottom and has multiple pressure relief holes on its perimeter. A water pump is installed within the water storage tanks. A connecting pipe slides vertically within the pressure relief pipe, with corresponding connection holes on each pressure relief hole. A driving assembly is installed on the floor slab. When the groundwater pressure rises, the driving assembly drives the connecting pipe upwards until the connection holes align with the pressure relief holes. While this patent allows for soil clearing of the pressure relief holes on the pipe, facilitating groundwater entry, it requires both a water pump and a driving assembly to operate the connecting pipe, increasing energy consumption and operating costs. Summary of the Invention

[0007] To address the aforementioned problems in the prior art, this invention provides an underground anti-buoyancy structure applicable to water-rich areas, which solves the problem of high energy consumption caused by the need for additional drive components when cleaning the pressure relief pipe in existing underground anti-buoyancy structures.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0009] A groundwater-resistant anti-buoyancy structure for use in water-rich areas is provided, comprising at least one vertically installed pressure relief pipe. Multiple permeable holes for groundwater ingress are formed on the circumferential sidewall of the pressure relief pipe. A floating rotary cleaning assembly is vertically installed inside the pressure relief pipe. The floating rotary cleaning assembly includes a rotating water pipe vertically installed inside the pressure relief pipe, and the rotating water pipe includes a connecting pipe connected to a water pump. Multiple curved suction pipes are connected to the circumferential sidewall of the connecting pipe. The multiple suction pipes are divided into two groups, which are symmetrically arranged on the connecting pipe, and the inlet directions of the two groups of suction pipes are opposite. The water pump is used to pump groundwater... Water flows from multiple suction pipes into a connecting pipe and then out to a pressure relief pipe. The suction pipes drive the connecting pipe to rotate during the water intake process. Each suction pipe inlet is equipped with bristles for cleaning multiple permeable holes. An air bladder is installed at the top of the connecting pipe, which floats on the groundwater and drives the connecting pipe to rise or fall with the groundwater level. A cylindrical cam is installed at the bottom of the connecting pipe, which cooperates with a cam guide to convert the linear motion of the connecting pipe into rotational motion. One end of the cam guide is fixed to the bottom of the pressure relief pipe, and the other end of the cam guide is rolledly connected to the cylindrical cam.

[0010] In this solution, the water pump, as the sole active component, not only extracts groundwater but also converts some of the kinetic energy generated during extraction into torque via a rotating water pipe. This torque drives the rotating water pipe to rotate, and the bristles on it clean the soil on the permeable pores, preventing soil deposition and compaction that could hinder timely groundwater drainage. The airbag utilizes the buoyancy of the groundwater to propel the rotating water pipe up or down with the water level, causing multiple bristles to rotate vertically simultaneously, creating a spiral motion that enhances the cleaning ability of the bristles on the pressure relief pipe. The cylindrical cam and cam guide work together to convert the linear motion of the rotating water pipe into rotational motion. As the groundwater level rises, the airbag drives the rotating water pipe upwards, while the pipe rotates under the guidance of the cylindrical cam and cam guide, causing the bristles to perform a spiral motion on the pressure relief pipe for cleaning. This process fully utilizes the hydraulic energy of the groundwater. This solution has low energy consumption, solving the problem of high energy consumption caused by the need for additional drive components when cleaning soil on the pressure relief pipe using existing underground anti-buoyancy structures.

[0011] Furthermore, the pump's inlet is connected to one end of the guide pipe, and the other end of the guide pipe passes through the air bladder and connects to the top of the connecting pipe. Rotary pipe fittings are provided at the points where the guide pipe connects to the air bladder and the connecting pipe. Connecting the guide pipe to the top of the connecting pipe, compared to connecting the guide pipe to the side wall of the connecting pipe, does not increase the rotational moment of inertia of the connecting pipe, thus not affecting its rotation. The rotary pipe fittings also allow the guide pipe and the air bladder to rotate relative to the connecting pipe, preventing the guide pipe from becoming entangled.

[0012] Furthermore, the central angle of the projection of each suction pipe in both the horizontal and vertical planes is 90°, and each suction pipe is tangentially positioned to the connecting pipe. This configuration ensures that the inlet direction of the suction pipe is tangential to its spiral circle in the horizontal plane, thus providing maximum torque to the connecting pipe; the outlet direction of the suction pipe is tangential to the connecting pipe in the vertical direction, minimizing the impact on the flow velocity of groundwater as it enters the connecting pipe. Moreover, as the suction pipe draws water, the groundwater level decreases, causing the air bladder to descend with the connecting pipe, and consequently, the suction pipe also moves downwards during rotation, creating a spiral motion.

[0013] Furthermore, each suction pipe is equipped with a Tesla valve, the outlet of which is connected to the connecting pipe. The Tesla valve has a one-way conduction characteristic, which makes it easy for groundwater to enter the suction pipe but difficult to discharge it, and helps to overcome the centrifugal force generated during the rotation of the suction pipe, allowing the water pump to operate at conventional power.

[0014] Furthermore, the cam guide includes a fixed post fixed to the bottom of the pressure relief pipe, two arc-shaped plates symmetrically arranged on the fixed post, and rollers rotatably mounted on both arc-shaped guide plates; the cylindrical cam has two symmetrically arranged cam grooves, and the two rollers roll within the two cam grooves respectively. The rolling of the two symmetrically arranged rollers within the two cam grooves not only converts the linear motion of the connecting pipe into rotational motion, but also, through the symmetrical force on the two rollers, ensures that the torque center of the connecting pipe is located on its axis, facilitating better rotation of the connecting pipe.

[0015] Furthermore, a connecting column is provided at the top of the cylindrical cam, and an overrunning clutch is provided between the connecting column and the bottom of the connecting pipe. Due to the configuration of the airbag and the cylindrical cam, when the groundwater level rises or falls, the airbag drives the connecting pipe to move up and down, thereby causing the connecting pipe itself to drive the bristles to perform a spiral motion as the groundwater level rises or falls. When the water pump is working, the suction pipe provides additional torque, and at the same time, the groundwater level drops. The overrunning clutch is provided so that the connecting pipe can utilize both the torque from the suction pipe and the hydraulic energy from the groundwater level. When the water pump is not working, the angular velocity of the connecting column is greater than that of the connecting pipe, and the connecting column can provide torque to the connecting pipe. When the water pump is working, the angular velocity of the connecting column is less than that of the connecting pipe, the rotational connection between the connecting column and the connecting pipe is broken, and the connecting pipe will not transmit torque to the connecting column. When the suction pipe causes the groundwater level to drop, the connecting pipe will rotate more times under the drive of the suction pipe. As a result, the spiral motion of the brush bristles during drainage is smaller than the spiral motion during groundwater level rise. In other words, the spiral trajectory formed by the spiral motion of the brush bristles during drainage is more compact, which increases the cleaning area of ​​a single brush bristle on the pressure relief pipe and enhances the cleaning effect.

[0016] Furthermore, a hollow cylindrical sealing sleeve is fitted onto the cylindrical cam and the cam guide, with both ends of the sealing sleeve fixed to the fixed column and the connecting column respectively via sealing bearings. The sealing sleeve isolates the cam groove and the ball bearings from groundwater, preventing groundwater from hindering the rolling between the cam groove and the ball bearings, and also preventing the cleaned soil from entering the cam groove.

[0017] Furthermore, a frustum-shaped transition pipe is provided at the top of the pressure relief pipe. The cam height of the cam groove is equal to the height of the transition pipe, and the top of the pressure relief pipe is connected to the large-diameter end of the transition pipe. This height of the cam groove allows the airbag to move up and down within the transition pipe. The frustum-shaped transition pipe, with its gradually decreasing diameter, alters the hydraulic pressure during the rise of the groundwater level. As the groundwater level rises, groundwater accumulates in the transition pipe, increasing the airbag's upward movement speed and allowing it to utilize the hydraulic energy of the groundwater to rotate the bristles on the connecting pipe.

[0018] Furthermore, the airbag is spherical, and its diameter falls within the range of the large-diameter end and the small-diameter end of the transition pipe. This diameter setting ensures that the airbag contacts the top opening of the transition pipe during its ascent. Groundwater will then compress the airbag at the top opening, allowing it to seal the transition pipe.

[0019] Furthermore, a pressure sensor is installed inside the airbag, which communicates with a host computer, which in turn is electrically connected to the water pump. When the groundwater level in the pressure relief pipe rises, causing the airbag to come into contact with the sealing pipe, the pressure sensor detects the increased pressure inside the airbag. This triggers the water pump, activating the pressure sensor to automatically drain water from the pressure relief pipe. Compared to existing technologies that directly place a liquid level sensor inside the pressure relief pipe, this pressure sensor is more durable. Because it is located inside the airbag and isolated from groundwater, its lifespan is also longer.

[0020] This invention discloses an underground anti-buoyancy structure applicable to water-rich areas, the beneficial effects of which are:

[0021] This invention eliminates the need for additional drive components to provide driving force when cleaning soil from the pressure relief pipe, using a water pump as the sole active component. The water pump not only extracts groundwater but also converts the kinetic energy of the groundwater during extraction into torque through a rotating water pipe. This torque drives the rotating water pipe, and its bristles clean the soil from the permeable pores, preventing soil deposits from hardening and hindering timely groundwater drainage. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of an underground anti-buoyancy structure applied in water-rich areas;

[0023] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0024] Figure 3 This is a schematic diagram of the rotating water pipe structure;

[0025] Figure 4 This is a top view of a rotating water pipe;

[0026] Figure 5 This is a schematic diagram of the internal structure of the water suction pipe;

[0027] Figure 6 This is a schematic diagram of the water suction pipe.

[0028] Figure 7 This is a schematic diagram of the flange structure;

[0029] Figure 8 A schematic diagram of a cylindrical cam and its mating components;

[0030] The components include: 1. Pressure relief pipe; 11. Transition pipe; 2. Rotating water pipe; 21. Connecting pipe; 22. Suction pipe; 221. Straight section; 222. Bent section; 223. Flange; 23. Brush; 24. Tesla valve; 3. Water pump; 31. Water guide pipe; 311. Rotating pipe joint; 4. Airbag; 41. Air pressure sensor; 5. Cylindrical cam; 51. Cam groove; 52. Connecting column; 521. Overrunning clutch; 6. Cam guide; 61. Fixed column; 62. Arc plate; 63. Roller; 7. Sealing sleeve; 8. Pressure relief well. Detailed Implementation

[0031] The specific embodiments of the present invention are described below to enable those skilled in the art to understand the present invention. However, it should be understood that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, various changes are obvious as long as they are within the spirit and scope of the present invention as defined and determined by the appended claims. All inventions utilizing the concept of the present invention are protected.

[0032] refer to Figure 1 This embodiment provides an underground anti-buoyancy structure for use in water-rich areas, which includes at least one pressure relief pipe 1 and a floating rotating cleaning assembly.

[0033] The pressure relief pipe 1 is vertically installed underground, with multiple permeable holes on its circumferential sidewalls for groundwater to enter. A floating rotating cleaning assembly is vertically installed inside the pressure relief pipe 1. In this embodiment, the pressure relief pipe 1 can be a permeable pipe with a closed bottom, allowing groundwater to enter from the circumferential sidewalls of the permeable pipe.

[0034] The permeable pipe itself has geotextile nonwoven fabric as a filter layer, but fine soil particles will still accumulate on the permeable holes. Over time, the fine soil particles may harden and block the permeable holes, affecting the entry of groundwater into the pressure relief pipe 1. Therefore, it is necessary to use a floating rotating cleaning component to clean and discharge the fine soil particles on the permeable holes with the groundwater.

[0035] The floating rotary cleaning assembly includes a rotary water pipe 2, a water pump 3, an air bladder 4, a cylindrical cam 5, and a cam guide 6.

[0036] The rotating water pipe 2 is vertically installed in the middle of the pressure relief pipe 1. The rotating water pipe 2 includes a connecting pipe 21 and multiple suction pipes 22.

[0037] The connecting pipe 21 is connected to the water pump 3, and multiple suction pipes 22 are connected to the circumferential side wall of the connecting pipe 21.

[0038] Multiple suction pipes 22 are divided into two groups, which are symmetrically arranged on the connecting pipe 21. The inlets of the two groups of suction pipes 22 are arranged in opposite directions, and the inlets of the two groups of suction pipes 22 will generate rotational torque when suctioning water. The water pump 3 is used to draw groundwater from the multiple suction pipes 22 into the connecting pipe 21 and out to the pressure relief pipe 1. The multiple suction pipes 22 are used to drive the connecting pipe 21 to rotate during the suction process.

[0039] refer to Figure 1 and Figure 2 Each of the multiple water inlets of the suction pipes 22 is equipped with bristles 23 for cleaning multiple water-permeable holes.

[0040] The airbag 4 is set at the top of the connecting pipe 21. The airbag 4 floats on the groundwater and is used to drive the connecting pipe 21 to rise or fall with the groundwater level.

[0041] The airbag 4 can use the buoyancy of the groundwater to drive the rotating water pipe 2 to rise or fall with the groundwater, so that multiple bristles 23 rotate and move vertically at the same time, forming a spiral motion, which improves the cleaning ability of the bristles 23 on the pressure relief pipe 1.

[0042] The cylindrical cam 5 is fixed to the bottom of the connecting pipe 21 and cooperates with the cam guide 6. The cylindrical cam 5 is used to convert the linear motion of the connecting pipe 21 into rotational motion through the cam guide 6.

[0043] One end of the cam guide 6 is fixed to the bottom of the pressure relief pipe 1, and the other end of the cam guide 6 is in rolling connection with the cylindrical cam 5.

[0044] The cylindrical cam 5 and the cam guide 6 work together to convert the linear motion of the rotating water pipe 2 into rotational motion. As the groundwater level rises, the airbag 4 drives the rotating water pipe 2 to rise. At the same time, the rotating water pipe 2 rotates under the cooperation of the cylindrical cam 5 and the cam guide 6, causing the bristles 23 to move in a spiral motion on the pressure relief pipe 1 and clean it. This process makes full use of the hydraulic energy of the groundwater.

[0045] This embodiment features low energy consumption, solving the problem of high energy consumption caused by the need for additional drive components when cleaning soil from the pressure relief pipe 1 in existing underground anti-buoyancy structures. This embodiment uses the water pump 3 as the sole active component, which not only extracts groundwater but also converts some of the kinetic energy of the groundwater during extraction into torque through the rotating water pipe 2. This drives the rotating water pipe 2 to rotate, and the brush bristles 23 on it clean soil particles from the permeable holes, preventing soil particles from accumulating and hardening on the permeable holes, thus avoiding untimely groundwater drainage.

[0046] Specifically, the water pump 3 is installed on the ground and connected to a power source. The outlet of the water pump 3 is connected to the pressure relief well 8 or other water storage equipment, and the inlet of the water pump 3 is connected to one end of the water guide pipe 31. The other end of the water guide pipe 31 passes through the air bladder 4 and is connected to the top of the connecting pipe 21. Rotary pipe joints 311 are provided at the joints of the water guide pipe 31 and the air bladder 4 and the connecting pipe 21.

[0047] The top of the water guide pipe 31 is connected to the top of the connecting pipe 21. Compared with the water guide pipe 31 being connected to the side wall of the connecting pipe 21, this will not increase the rotational moment of inertia of the connecting pipe 21, thus not affecting the rotation of the connecting pipe 21. Furthermore, the setting of the rotating pipe joint 311 allows the water guide pipe 31 and the airbag 4 to rotate relative to the connecting pipe 21, preventing the water guide pipe 31 from getting tangled.

[0048] As a further solution in this embodiment, refer to Figure 3 and Figure 4 Each suction pipe 22 has a central angle of 90° in both the horizontal and vertical planes, and each suction pipe 22 is tangentially arranged to the connecting pipe 21. This shape arrangement ensures that the inlet direction of the suction pipe 22 is tangential to its spiral circle in the horizontal plane, thus providing maximum torque to the connecting pipe 21; the outlet direction of the suction pipe 22 is tangential to the connecting pipe 21 in the vertical direction, minimizing the impact on the flow velocity of groundwater entering the connecting pipe 21. Furthermore, as the suction pipe 22 draws water, the groundwater level decreases, and the airbag 4 lowers the connecting pipe 21, causing the suction pipe 22 to move downwards during rotation, forming a spiral motion.

[0049] As a further solution in this embodiment, refer to Figure 5 Each suction pipe 22 is equipped with a Tesla valve 24, the outlet of which is connected to the connecting pipe 21. The Tesla valve 24 has a one-way conduction characteristic, which makes it easy for groundwater to enter the suction pipe 22 but difficult to discharge, and helps to overcome the centrifugal force generated during the rotation of the suction pipe 22, so that the water pump 3 can operate at conventional power.

[0050] As another solution in this embodiment, refer to Figure 6 and Figure 7Each suction pipe 22 is L-shaped and horizontally mounted on the connecting pipe 21. Each suction pipe 22 includes an interconnected straight section 221 and a bent section 222. The corners of the straight section 221 and the bent section 222 are smoothly transitioned. The outer wall of the bent section 222 near the inner wall of the pressure relief well 8 is provided with bristles 23. The outer wall of the straight section 221 near the bent section 222 is provided with an isosceles triangular prism-shaped flange 223. The sharp edges on the flange 223 help reduce the resistance encountered by the straight section 221 in water rotation, allowing the suction force generated by the bent section 222 to better drive the straight section 221 to rotate. A Tesla valve 24 can also be installed in the straight section 221 to reduce the influence of centrifugal force.

[0051] Specifically, refer to Figure 8 The cam guide 6 includes a fixed column 61 fixed on the bottom of the pressure relief pipe 1. Two arc-shaped plates 62 are symmetrically arranged on the fixed column 61. Rollers 63 are rotatably arranged on both arc-shaped guide plates. Two cam grooves 51 are symmetrically arranged on the cylindrical cam 5. The two rollers 63 are respectively rotatably arranged in the two cam grooves 51.

[0052] By having two symmetrically arranged rollers 63 rolling in the two cam grooves 51, the linear motion of the connecting pipe 21 is not only converted into rotational motion, but also the torque center of the connecting pipe 21 is located on its axis through the symmetrical force of the two rollers 63, which facilitates better rotation of the connecting pipe 21.

[0053] Specifically, a connecting post 52 is provided at the top of the cylindrical cam 5, and an overrunning clutch 521 is provided between the connecting post 52 and the bottom of the connecting pipe 21.

[0054] Due to the configuration of the airbag 4 and the cylindrical cam 5, when the groundwater level rises or falls, the airbag 4 drives the connecting pipe 21 to move up and down, thereby causing the connecting pipe 21 itself to drive the bristles 23 to perform a spiral motion as the groundwater level rises or falls. When the water pump 3 is working, the suction pipe 22 provides additional torque, and at the same time, the groundwater level drops. The overrunning clutch 521 is configured so that the connecting pipe 21 can simultaneously utilize the torque from the suction pipe 22 and the hydraulic energy from the groundwater level.

[0055] When the water pump 3 is not working, the angular velocity of the connecting column 52 is greater than that of the connecting pipe 21, and the connecting column 52 can provide torque to the connecting pipe 21. When the water pump 3 is working, the angular velocity of the connecting column 52 is less than that of the connecting pipe 21, the rotational connection between the connecting column 52 and the connecting pipe 21 is broken, and the connecting pipe 21 will not transmit torque to the connecting column 52. When the suction pipe 22 causes the groundwater level to drop due to pumping, the connecting pipe 21 will rotate more times under the drive of the suction pipe 22. As a result, the spiral motion of the brush bristles 23 during drainage has a smaller lead than the spiral motion during groundwater level rise. That is, the spiral trajectory formed by the spiral motion of the brush bristles 23 during drainage is more compact, which increases the cleaning area of ​​a single brush bristle 23 on the pressure relief pipe 1 and enhances the cleaning effect.

[0056] As a further embodiment, a hollow cylindrical sealing sleeve 7 is fitted onto the cylindrical cam 5 and the cam guide 6. Both ends of the sealing sleeve 7 are fixed to the fixed column 61 and the connecting column 52 respectively by sealing bearings. The sealing sleeve 7 isolates the cam groove 51 and the ball bearings from groundwater, preventing groundwater from hindering the rolling between the cam groove 51 and the ball bearings, and also preventing soil particles from entering the cam groove 51 after cleaning.

[0057] As a further embodiment, the top of the pressure relief pipe 1 is provided with a frustum-shaped transition pipe 11, the cam height of the cam groove 51 is equal to the height of the transition pipe 11, and the top of the pressure relief pipe 1 is connected to the large-diameter end of the transition pipe 11. By setting the height of the cam groove 51 in this way, the airbag 4 can move up and down in the transition pipe 11.

[0058] The frustum-shaped transition pipe 11, with its gradually decreasing diameter, alters the hydraulic pressure during the rise of the groundwater level. As the groundwater level rises, groundwater accumulates in the transition pipe 11, increasing the upward movement speed of the airbag 4 and consequently increasing the spiral movement speed of the brush 23. This allows the airbag 4 to utilize the hydraulic energy of the groundwater to rotate the brush 23 on the connecting pipe 21.

[0059] Specifically, the airbag 4 is spherical, and its diameter is within the range of the large-diameter end diameter and the small-diameter end diameter of the transition pipe 11. By setting the diameter of the airbag 4 in this way, the airbag 4 comes into contact with the top opening of the transition pipe 11 during its ascent. The groundwater will squeeze the airbag 4 at the top opening of the transition pipe 11, which can seal the transition pipe 11.

[0060] As a further embodiment, a pressure sensor 41 is installed inside the airbag 4. The pressure sensor 41 is communicatively connected to a host computer, which is electrically connected to the water pump 3. When the groundwater level in the pressure relief pipe 1 rises, causing the airbag 4 to come into contact with the sealing pipe, the pressure sensor 41 will detect the increased air pressure inside the airbag 4. The water pump 3 will then start based on the signal from the pressure sensor 41, thus achieving the automatic drainage function of the pressure relief pipe 1. The installation of the pressure sensor 41 is more durable than directly installing a liquid level sensor in the pressure relief pipe 1 in existing technologies. Because the pressure sensor 41 is located inside the airbag 4 and is isolated from groundwater, its service life is longer.

[0061] In this embodiment, the air pressure sensor 41 can communicate with the host computer via a Bluetooth module. After the host computer detects that the air pressure value of the air pressure sensor 41 has increased to a certain value, it will start the water pump 3 to pump water. The host computer can set the working time of the water pump 3 each time, or it can turn off the water pump 3 after detecting that the air pressure value of the air pressure sensor 41 has decreased and remained so for a period of time.

[0062] The working principle of this embodiment is as follows:

[0063] Groundwater level rise process: Groundwater enters the pressure relief pipe 1 through multiple permeable holes, the groundwater level rises, the airbag 4 floats up and drives the rotating water pipe 2 to move upward. The rotating water pipe 2 will make an upward spiral motion with the cooperation of the cylindrical cam 5 and the cam guide 6, so that the multiple bristles 23 on the rotating water pipe 2 clean the soil particles on the permeable holes.

[0064] Groundwater level drop process: The pump 3 is started to extract groundwater. The groundwater flows from multiple suction pipes 22 on the rotating water pipe 2 into the connecting pipe 21 and is discharged to the outside or into the drainage well. The flowing groundwater in the multiple suction pipes 22 will generate torque, which will drive the rotating water pipe 2 to make a downward spiral motion. Multiple bristles 23 clean the soil particles on the permeable holes.

[0065] At the same time, even if the groundwater level in the pressure relief pipe 1 drops naturally and the water pump 3 is not started, the air bag 4 will naturally drive the rotating water pipe 2 to descend. The rotating water pipe 2 will also make a downward spiral motion with the cooperation of the cylindrical cam 5 and the cam guide 6, so that the multiple bristles 23 on the rotating water pipe 2 clean the soil particles on the permeable holes.

[0066] Although specific embodiments of the invention have been described in detail with reference to the accompanying drawings, this should not be construed as limiting the scope of protection of this patent. Various modifications and variations that can be made by a person skilled in the art without inventive effort within the scope described in the claims still fall within the scope of protection of this patent.

Claims

1. An underground anti-buoyancy structure for use in water-rich areas, characterized in that, It includes at least one pressure relief pipe (1) vertically installed underground, with multiple permeable holes for groundwater to enter on the circumferential side wall of the pressure relief pipe (1), and a floating rotating cleaning assembly vertically installed inside the pressure relief pipe (1); The floating rotating cleaning assembly includes a rotating water pipe (2) vertically installed inside the pressure relief pipe (1). The rotating water pipe (2) includes a connecting pipe (21) connected to a water pump (3). Multiple curved suction pipes (22) are connected to the circumferential sidewall of the connecting pipe (21). The multiple suction pipes (22) are divided into two groups, and the two groups of suction pipes (22) are symmetrically arranged on the connecting pipe (21), and the inlet directions of the two groups of suction pipes (22) are opposite. The water pump (3) is used to draw groundwater from the multiple suction pipes (22) into the connecting pipe (21) and out of the pressure relief pipe (1). The multiple suction pipes (22) are used to drive the connecting pipe (21) to rotate during the water suction process. Each of the multiple water inlets (22) is equipped with bristles (23) for cleaning the multiple water-permeable holes. An airbag (4) is provided at the top of the connecting pipe (21). The airbag (4) floats on the groundwater and is used to drive the connecting pipe (21) to rise or fall with the groundwater. The bottom of the connecting pipe (21) is provided with a cylindrical cam (5) that cooperates with the cam guide (6). The cylindrical cam (5) is used to convert the linear motion of the connecting pipe (21) into rotational motion through the cam guide (6). One end of the cam guide (6) is fixed to the bottom of the pressure relief pipe (1), and the other end of the cam guide (6) is rolledly connected to the cylindrical cam (5); The water pump (3) has its pumping port connected to one end of the water guide pipe (31), and the other end of the water guide pipe (31) passes through the air bag (4) and is connected to the top of the connecting pipe (21). A rotating pipe joint (311) is provided at the connection point between the water guide pipe (31) and the air bag (4) and the connecting pipe (21). The cam guide (6) includes a fixed column (61) fixed on the bottom of the pressure relief pipe (1), two arc-shaped plates (62) are symmetrically arranged on the fixed column (61), and rollers (63) are rotatably arranged on both arc-shaped plates (62); the cylindrical cam (5) is symmetrically arranged with two cam grooves (51), and the two rollers (63) are respectively rolled in the two cam grooves (51); The top of the cylindrical cam (5) is provided with a connecting post (52), and an overrunning clutch (521) is provided between the connecting post (52) and the bottom of the connecting pipe (21).

2. The underground anti-buoyancy structure applied in water-rich areas according to claim 1, characterized in that, The central angle of the projection of each of the water suction pipes (22) on the horizontal and vertical planes is 90°, and each water suction pipe (22) is tangential to the connecting pipe (21).

3. The underground anti-buoyancy structure applied in water-rich areas according to claim 1, characterized in that, Each of the water suction pipes (22) is equipped with a Tesla valve (24), and the outlet of the Tesla valve (24) is connected to the connecting pipe (21).

4. The underground anti-buoyancy structure applied in water-rich areas according to claim 1, characterized in that, The cylindrical cam (5) and the cam guide (6) are fitted with a hollow cylindrical sealing sleeve (7), and both ends of the sealing sleeve (7) are fixed to the fixed column (61) and the connecting column (52) respectively by sealing bearings.

5. The underground anti-buoyancy structure applied in water-rich areas according to claim 1, characterized in that, The top of the pressure relief pipe (1) is provided with a frustum-shaped transition pipe (11), and the cam height of the cam groove (51) is equal to the height of the transition pipe (11).

6. The underground anti-buoyancy structure applied in water-rich areas according to claim 5, characterized in that, The airbag (4) is spherical, and the diameter of the airbag (4) is within the range of the large diameter end diameter and the small diameter end diameter of the transition tube (11).

7. The underground anti-buoyancy structure applied in water-rich areas according to claim 6, characterized in that, The airbag (4) is equipped with a pressure sensor (41), which is connected to the host computer. The host computer is electrically connected to the water pump (3).

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