A cast-in-place pile anti-settling residue adjustable steel casing system and a method of using the same

Abstract

This invention relates to the technical field of pile foundation construction equipment and control, and discloses an adjustable steel casing system for preventing sediment accumulation in cast-in-place piles and its usage method. The system includes a hydraulic adjustment mechanism, a pile casing, a bottom contact detection device casing, multiple electromagnetic contact sensors, a contact ring, and a controller. The hydraulic adjustment mechanism is threadedly connected to the pile casing, and the pile casing is threadedly connected to the bottom contact detection device casing. The bottom contact detection device casing is connected to the contact ring via electromagnetic contact sensors. The contact ring protrudes from the outer circumference of the bottom contact detection device casing, and the electromagnetic contact sensors are arranged along the circumference of the contact ring. The controller is connected to the electromagnetic contact sensors via a signal acquisition device, and the controller is connected to the hydraulic adjustment mechanism via a hydraulic actuator. This invention can accurately detect the bottom contact state, automatically determine the stress conditions, effectively prevent sediment accumulation, and significantly improve the construction quality and efficiency of cast-in-place piles.

Description

Technical Field

[0001] This invention relates to the technical field of pile foundation construction equipment and control, and in particular to an adjustable steel casing system for preventing sedimentation in cast-in-place piles and its usage method. Background Technology

[0002] In the construction of cast-in-place piles, steel casings serve as borehole wall support and water-blocking guidance devices, playing a crucial role in maintaining borehole stability, guiding drilling, and sealing off water bodies. In traditional construction, casings are typically lowered to the estimated depth using cranes, with bottom contact assessment relying on operator experience or rough manual judgment. This presents several significant problems: Traditional casing bottom contact is often determined by a "light touch," making it difficult to accurately identify the pile bottom contact state. This results in incomplete casing sinking, excessive gaps between the casing bottom and the pile bottom soil, leading to sediment accumulation during concrete pouring, affecting the contact quality between the concrete pile tip and the foundation, and ultimately, the quality of the pile tip formation. In complex terrain or elevation differences, the top of the casing often cannot be kept horizontal, making it difficult to place the concrete guide pipe and affecting subsequent construction accuracy. Traditional casing top sections are difficult to splice, lacking flexibility when pile length changes. Currently, most casing systems lack automated sensing and lowering control systems, relying on manual observation and subjective judgment, resulting in poor safety and reliability. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the existing technology and to provide an adjustable steel casing system for preventing sedimentation in cast-in-place piles and its usage method.

[0004] The objective of this invention is achieved through the following technical solution: An adjustable steel casing system for preventing sedimentation in cast-in-place piles includes a hydraulic adjustment mechanism, a pile casing, a bottom contact detection device casing, multiple electromagnetic contact sensors, a contact ring, a hydraulic actuator, a signal collector, and a controller. The lower end of the hydraulic adjustment mechanism is threadedly connected to the upper end of the pile casing via a threaded cylinder. The lower end of the pile casing is threadedly connected to the upper end of the bottom contact detection device casing. The lower end of the bottom contact detection device casing is connected to the contact ring via multiple electromagnetic contact sensors. The contact ring protrudes from the outer circumference of the bottom contact detection device casing. The multiple electromagnetic contact sensors are arranged along the circumference of the contact ring. The controller is connected to the hydraulic adjustment mechanism via the hydraulic actuator. The controller is electrically connected to the multiple electromagnetic contact sensors via the signal collector.

[0005] Preferably, the hydraulic adjustment mechanism includes a telescopic sleeve and a plurality of hydraulic cylinders, the plurality of hydraulic cylinders being distributed on the outer periphery of the telescopic sleeve, the two ends of the hydraulic cylinders being connected to the two ends of the telescopic sleeve via threaded cylinders, and the plurality of hydraulic cylinders being connected to the hydraulic actuator.

[0006] Preferably, the telescopic length of the telescopic sleeve includes 1 to 2 meters.

[0007] Preferably, the pile casing includes multiple casing sections and sealing rings, with the multiple casing sections connected by the sealing rings. The uppermost casing section is connected to the hydraulic adjustment mechanism, and the lowermost casing section is threadedly connected to the bottom contact detection device.

[0008] Preferably, the lower end of the casing section is provided with a bottom limiting protrusion ring, and the upper end of the casing section is provided with a snap-fit ​​ring and a top limiting protrusion ring. The snap-fit ​​ring and the top limiting protrusion ring form a sealing ring mounting groove. The sealing ring is sleeved in the sealing ring mounting groove. The bottom limiting protrusion ring of one casing section is snapped with the snap-fit ​​ring of another casing section.

[0009] Preferably, the electromagnetic contact sensor includes a sealed steel block, a permanent magnet ring, an electromagnetic coil, a steel wire, a steel pipe, and an electromagnetic signal capturing sensor. Both ends of the steel pipe are connected to the sealed steel block. The bottom-contact detection device sleeve is connected to the sealed steel block at the upper end of the steel pipe via the upper end of the steel wire. The middle of the steel wire passes through the center of the permanent magnet ring, and the lower end of the steel wire is connected to the contact ring via the sealed steel block at the lower end of the steel pipe. The electromagnetic coil is wound around the permanent magnet ring. The electromagnetic signal capturing sensor senses the electromagnetic signal of the electromagnetic coil and is electrically connected to the signal acquisition unit. Both ends of the steel pipe are connected to the bottom-contact detection device sleeve and the contact ring, respectively.

[0010] A method for using an adjustable steel casing system for preventing sedimentation in cast-in-place piles includes the following steps:

[0011] S1. Select an appropriate number of casing sections according to the pile length and assemble them into a pile casing. Pre-install the electromagnetic contact sensor and contact ring on the bottom contact detection device casing. Then connect the pile casing to the bottom contact detection device casing and connect the electromagnetic contact sensor to the controller through the signal acquisition device.

[0012] S2. The pile casing and the bottom contact detection device casing are lowered synchronously by hoisting, and the hydraulic adjustment mechanism is connected to the upper end of the pile casing through a threaded cylinder. The hydraulic driver is connected to the hydraulic adjustment mechanism to obtain the aforementioned adjustable steel casing system for preventing sedimentation of cast-in-place piles.

[0013] S3. An adjustable steel casing system for preventing sedimentation in cast-in-place piles is placed into the pile hole, and the controller monitors the pressure value of the electromagnetic contact sensor through a signal acquisition device.

[0014] S4. When the sum of the pressure values ​​detected by all electromagnetic contact sensors is close to the self-weight of the casing of the bottom contact detection device, the controller determines that the pile casing has touched the bottom.

[0015] S5. The pressure values ​​detected by each electromagnetic contact sensor are fed back to the controller through the signal acquisition device. The controller determines whether the pressure values ​​are equal. If they are, the controller determines that the pile casing is in a vertical state. Otherwise, the controller controls the hydraulic adjustment mechanism through the hydraulic drive to adjust the verticality of the pile casing.

[0016] S6. Fix the position of the hydraulic adjustment mechanism to complete the installation of the pile casing.

[0017] The present invention has the following advantages and beneficial effects compared with the prior art:

[0018] 1. This invention solves the problems of inaccurate bottom contact identification, insufficient structural rigidity, difficulty in removing sediment, and poor construction adaptability in the prior art by using a hydraulic adjustment mechanism, pile casing, bottom contact detection device casing, multiple electromagnetic contact sensors, contact ring, hydraulic drive, signal acquisition device, and controller. It achieves precise casing placement, effective sediment control, reliable load transfer, and controllable construction safety. It can realize graded control of the pile casing and bottom contact detection device casing during the pile casing placement process, accurately detect the bottom contact state, automatically judge the stress conditions, effectively prevent sediment accumulation, and significantly improve the construction quality and efficiency of cast-in-place piles.

[0019] 2. The sealing steel block, permanent magnet ring, electromagnetic coil, steel wire, steel pipe and electromagnetic signal capture sensor of the present invention can sense data, and parameters such as the depth of the pile casing, the bottom contact time and load response can be recorded in real time and uploaded to the construction quality database. Through data analysis, it is possible to determine whether there are construction hazards such as overpressure lowering and sediment interference, and provide digital basis for subsequent quality retrospective and acceptance. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of an adjustable steel casing system for preventing sedimentation in cast-in-place piles according to the present invention;

[0021] Figure 2 This is an exploded view of the hydraulic adjustment mechanism and threaded cylinder of an adjustable steel casing system for preventing sedimentation in cast-in-place piles according to the present invention.

[0022] Figure 3 This is a schematic diagram of the connection of the casing section in an adjustable steel casing system for preventing sedimentation in cast-in-place piles according to the present invention;

[0023] Figure 4 This is an exploded view of the casing section connection of an adjustable steel casing system for preventing sedimentation in cast-in-place piles according to the present invention.

[0024] Figure 5 This is a schematic diagram of the assembly of the bottom contact detection device, electromagnetic contact sensor and contact ring of the adjustable steel casing system for preventing sedimentation in cast-in-place piles according to the present invention.

[0025] Figure 6 This is an exploded view of the bottom contact detection device, electromagnetic contact sensor, and contact ring of the adjustable steel casing system for preventing sedimentation in cast-in-place piles according to the present invention.

[0026] Figure 7 This is a front view of the bottom contact detection device, electromagnetic contact sensor, and contact ring of the adjustable steel casing system for preventing sedimentation in cast-in-place piles according to the present invention.

[0027] Figure 8 This is an exploded view of the electromagnetic contact sensor of the adjustable steel casing system for preventing sedimentation in cast-in-place piles according to the present invention.

[0028] Figure 9 This is a schematic diagram illustrating the working principle of an adjustable steel casing system for preventing sedimentation in cast-in-place piles according to the present invention.

[0029] The components in the attached diagram are labeled as follows: 1-Threaded cylinder; 2-Hydraulic adjustment mechanism; 21-Telescopic sleeve; 22-Hydraulic cylinder; 3-Pile body sleeve; 31-Sleeve section; 311-Bottom limiting protrusion ring; 312-Snap-fit ​​ring; 313-Top limiting protrusion ring; 32-Sealing ring; 4-Bottom contact detection device sleeve; 41-Sensor connection part; 5-Electromagnetic contact sensor; 51-Sealing steel block; 52-Permanent magnet ring; 53-Electromagnetic coil; 54-Steel wire; 55-Steel pipe; 56-Electromagnetic signal capture sensor; 6-Contact ring. Detailed Implementation

[0030] The invention's objective will be further described in detail below with reference to the accompanying drawings and specific embodiments. The embodiments cannot be described in detail here, but the implementation of the invention is not limited to the following embodiments.

[0031] like Figures 1-7As shown, an adjustable steel casing system for preventing sedimentation in cast-in-place piles includes two threaded cylinders 1, a hydraulic adjustment mechanism 2, a pile casing 3, a bottom-contact detection device casing 4, four electromagnetic contact sensors 5, a contact ring 6, a hydraulic actuator, a signal collector, and a controller. The hydraulic adjustment mechanism 2 includes a telescopic casing 21 and four hydraulic cylinders 22. The upper end of the telescopic casing 21 and the fixed ends of the four hydraulic cylinders 22 are fixedly connected to the bottom of one threaded cylinder 1. The lower end of the telescopic casing 21 and the telescopic ends of the four hydraulic cylinders 22 are fixedly connected to the top of the other threaded cylinder 1. The four hydraulic cylinders 22 are distributed around the outer periphery of the telescopic casing 21. The two threaded cylinders 1 have external threads, the upper end of the pile casing 3 has internal threads, and the threaded cylinder 1 at the lower end of the telescopic casing 21 is threadedly connected to the upper end of the pile casing 3. The bottom contact detection device casing 4 has an internal thread, and the lower end of the pile body casing 3 has an external thread. The bottom contact detection device casing 4 is threadedly connected to the lower end of the pile body casing 3, and the outer diameter of the bottom contact detection device casing 4 is slightly larger than the outer diameter of the pile body casing 3. The center line of the bottom contact detection device casing 4 overlaps with that of the contact ring 6, and the outer diameter of the contact ring 6 is larger than that of the bottom contact detection device casing 4. The lower ends of the four electromagnetic contact sensors 5 are fixedly mounted on the contact ring 6 along the outer circumference of the contact ring 6, and the upper ends of the four electromagnetic contact sensors 5 are fixedly connected to the sensor connection part 41 of the bottom contact detection device casing 4. The controller is connected to the four electromagnetic contact sensors 5 respectively through a signal acquisition device. The controller is connected to the four hydraulic cylinders 22 respectively through a hydraulic actuator.

[0032] The main function of the threaded cylinder 1 is to facilitate the installation and disassembly of the hydraulic adjustment mechanism 2 and the pile casing 3. The hydraulic adjustment mechanism 2 is used to control the raising and lowering of the pile casing 3 and adjust its verticality. The pile casing 3 is made of steel, and its main function is to ensure that the drilling rig drills vertically downwards along the designed pile position, preventing deviation at the borehole opening, and is the first line of defense for ensuring the verticality of the pile. The main function of the bottom contact detection device casing 4 is to be the first to contact the bottom of the pile hole, carrying the sensor and transmitting the force it receives. The main function of the electromagnetic contact sensor 5 is to determine the bottom contact of the bottom contact detection device casing 4, converting mechanical contact into a measurable electrical signal. At the same time, the pressure values ​​of the four electromagnetic contact sensors 5 are fed back to the controller to determine the verticality of the pile casing 3. The signal acquisition device can be purchased on the existing market, and its main function is to collect the pressure data of the electromagnetic contact sensors 5. The main function of the contact ring 6 is to directly contact the soil layer and evenly transmit pressure to the four electromagnetic contact sensors 5, acting as their "trigger plate." When the contact ring 6 is compressed, it undergoes a limiting deformation along the axial direction of the pile casing 3. The hydraulic actuator is a hydraulic pump, which can be purchased on the market. It controls the extension and retraction of its corresponding hydraulic cylinder 22 by issuing commands through the controller. The controller is a PLC controller, capable of processing the signals from the electromagnetic contact sensors 5 and calculating the corresponding force to determine whether the pile casing 3 has reached the bottom and whether it is vertical, and issuing control commands to control the extension and retraction of the hydraulic cylinders 22. The extension and retraction length of the telescopic casing 21 ranges from 1 to 2 meters and can be finely adjusted according to the elevation of the construction platform. Its main function is to act as an actuator, directly changing the height and horizontal posture of the top opening of the pile casing 3, adapting to uneven terrain and differences in construction platform height, and is key to correcting verticality. The main function of the hydraulic cylinders 22 is to receive commands from the controller and, through asynchronous extension and retraction movements, precisely adjust the posture of the telescopic casing 21 and the entire casing system.

[0033] like Figure 1 , 3 As shown in Figure 4, the pile casing 3 includes multiple casing sections 31 and sealing rings 32. Each casing section 31 has a top limiting protrusion 313 at its upper end, with internal threads on its inner wall. A snap-fit ​​ring 312 is provided on the upper outer wall of the casing section 31. The snap-fit ​​ring 312 and the top limiting protrusion 313 form a sealing ring mounting groove. The sealing ring 32 is fitted into the sealing ring mounting groove and protrudes beyond its outer periphery. The outer wall of the sealing ring 32 connects to another casing section 31. Each casing section 31 has a bottom limiting protrusion 311 on its lower inner wall, which snaps into the snap-fit ​​ring 312. The top limiting protrusion 313 of the uppermost casing section 31 is threadedly connected to the threaded cylinder 1 at the lower end of the hydraulic adjustment mechanism 2. The lower end of the outer wall of the lowest section of the protective sleeve 31 is provided with external threads, and the lower end of the protective sleeve 31 is threadedly connected to the protective sleeve 4 of the bottom contact detection device.

[0034] The main function of the casing section 31 is to form the pile casing 3, supporting the borehole wall, isolating groundwater, and ensuring the basic safety and stability of the drilling operation. The main function of the top limiting protrusion ring 313 is to quickly connect or disconnect with the threaded cylinder 1 and to fix the sealing ring 32. The main function of the sealing ring 32 is to improve the sealing performance at the connection between the casing sections 31, preventing groundwater leakage into the interior of the pile casing 3 and preventing grout leakage during subsequent concrete pouring. The snap-fit ​​ring 312 enables quick connection and locking between the casing sections 31. The main function of the bottom limiting protrusion ring 311 is to quickly connect and lock with the snap-fit ​​ring 312 and to fix the sealing ring 32.

[0035] like Figure 8 and 9 As shown, the electromagnetic contact sensor 5 includes two sealed steel blocks 51, a permanent magnet ring 52, an electromagnetic coil 53, a steel wire 54, a steel pipe 55, and an electromagnetic signal capturing sensor 56. Both ends of the steel pipe 55 are connected to the sealed steel blocks 51. The upper end of the steel wire 54 is fixedly connected to the bottom of the sealed steel block 51 at the upper end of the steel pipe 55, and the lower end of the steel wire 54 is fixedly connected to the top of the sealed steel block 51 at the lower section of the steel pipe 55. The steel wire 54 is in a taut state. The axial direction of the steel wire 54 is the same as the axial direction of the steel pipe 55. The middle part of the steel wire 54 passes through the center of the permanent magnet ring 52. The electromagnetic coil 53 is wound around the permanent magnet ring 52. The electromagnetic signal capturing sensor 56 senses the electromagnetic signal of the electromagnetic coil 53 and is electrically connected to the signal acquisition device. The upper end of the steel pipe 55 is fixedly connected to the bottom-contact detection device casing 4, and the lower end of the steel pipe 55 is fixedly connected to the top of the contact ring 6.

[0036] Both the steel pipe 55 and the sealing steel block 51 are made of stainless steel, forming a sealed cavity to protect the internal precision components such as the coil and steel wire 54 from external mud, water, and sand corrosion and contamination. The permanent magnet ring 52 is fixed near the steel wire 54, providing a stable magnetic field around a section of the wire. When the steel wire 54 vibrates in the magnetic field, it follows the law of electromagnetic induction, which is crucial for generating electrical signals. The main function of the electromagnetic coil 53 is that when a weak alternating current is applied to the coil, it generates an alternating magnetic field. This alternating magnetic field interacts with the constant magnetic field of the permanent magnet ring 52, exciting the steel wire 54 to vibrate at its natural frequency. Simultaneously, the vibrating steel wire 54 cuts magnetic field lines, inducing a current in the coil. The main function of the steel wire 54 is that, in the initial state, it is pre-tensioned, like a guitar string, possessing a specific natural vibration frequency. When the steel pipe 55 is deformed under pressure, the distance between the two sealing steel blocks 51 will slightly shorten, causing the steel wire 54 to loosen and its tension to decrease. Its natural vibration frequency will then change significantly, and this frequency change is the fundamental source of the bottoming-out signal. A certain pre-tension can be applied to the steel wire 54 before installation to prevent excessive loosening that could cause system misjudgment or sensor damage. The frequency of the electrical signal output by the electromagnetic coil 53 is directly equal to the vibration frequency of the steel wire 54. The electromagnetic signal capture sensor 56 is used to collect the electromagnetic signal from the electromagnetic coil 53 and convert it into an electrical signal. The controller monitors this frequency change through the signal acquisition device and can then inversely calculate the tension state of the steel wire 54, thereby determining whether the electromagnetic contact sensor 5 is under pressure.

[0037] The adjustable steel casing system for preventing sedimentation in cast-in-place piles according to this embodiment has the following advantages:

[0038] This system automatically controls the extension and retraction of the hydraulic adjustment mechanism 2 based on the ground elevation difference and platform elevation, ensuring that the pile casing 3 is inserted without deviation or obstruction during construction, significantly improving construction efficiency and verticality control accuracy. The pile casing 3 is connected by threads, making installation and transportation convenient; different pile lengths can be quickly adapted by adding or removing sections without replacing the entire equipment, saving construction costs.

[0039] A method for using an adjustable steel casing system for preventing sediment accumulation in cast-in-place piles effectively prevents sediment buildup through phased control. The method includes the following steps:

[0040] S1. Select an appropriate number of casing sections 31 according to the pile length and assemble them into pile casing 3. Thread the lower end of the pile casing 3 to the bottom contact detection device casing 4. The bottom contact detection device casing 4 is pre-installed with four electromagnetic contact sensors 5 and contact rings 6. Connect the four electromagnetic contact sensors 5 to the signal acquisition unit, and then connect the hydraulic actuator to the controller.

[0041] S2. The pile casing 3 and the bottom contact detection device casing 4 are lowered synchronously by hoisting. Then, the hydraulic adjustment mechanism 2 is connected to the upper end of the pile casing 3 through the threaded cylinder 1. The hydraulic drive is connected to the hydraulic adjustment mechanism 2 to obtain an adjustable steel casing system for preventing sedimentation in cast-in-place piles.

[0042] S3. The height of the pile casing 3 from the soil surface is controlled by the hydraulic drive until it adapts to the appropriate construction height of the grouting equipment. The pile casing 3 continues to be lowered. The controller monitors the pressure value of the electromagnetic contact sensor 5 through the signal acquisition device. When the contact ring 6 of the electromagnetic contact sensor 5 contacts the soil and generates axial pressure, the steel wire 54 relaxes, the vibration frequency changes significantly, and the coil induced current value changes significantly, which can be used as a bottoming identification criterion.

[0043] S4. When the sum of the pressure values ​​detected by the four electromagnetic contact sensors 5 in step S3 is close to the self-weight of the bottom contact detection device casing 4, the controller determines that the pile casing 3 has touched the bottom, so as to achieve precise bottom contact control and prevent single-point misjudgment. Assuming that the pressure values ​​detected by each electromagnetic contact sensor 5 are Q1, Q2, Q3, Q4, and the self-weight of the bottom contact detection device casing 4 is W, then when W = Q1 + Q2 + Q3 + Q4, the controller determines that all contacts are made, that is, the bottom contact detection device casing 4 has touched the bottom, and controls the hydraulic adjustment mechanism 2 to stop lowering.

[0044] S5. The pressure values ​​detected by the four electromagnetic contact sensors 5 are transmitted to the controller via a signal acquisition device. The controller determines whether the pressure values ​​of the electromagnetic contact sensors 5 are equal. If they are, the controller determines that the pile casing 3 is in a vertical state. Otherwise, the controller controls the hydraulic adjustment mechanism 2 through the hydraulic actuator to adjust the verticality of the pile casing 3. When the controller determines that the pressure values ​​of the four electromagnetic contact sensors 5 are not equal, i.e., Q1≠W / 4, Q2≠W / 4, Q3≠W / 4, or Q4≠W / 4, the hydraulic cylinder 22 is activated to locally lift or lower the pressure according to the directional difference, thereby correcting the posture of the pile casing 3 (Q1=W / 4, Q2=W / 4, Q3=W / 4, Q4=W / 4, error not greater than 5%, the error can be set according to the situation), and thus adjusting the inclination of the pile.

[0045] S6. Fix the position of the hydraulic adjustment mechanism 2 to complete the installation of the pile casing 3.

[0046] A method for using an adjustable steel casing system for preventing sedimentation in cast-in-place piles not only improves construction accuracy and efficiency but also effectively prevents sedimentation and ensures pile tip quality. It has broad application prospects in pile foundation engineering for bridge foundations, high-rise buildings, and offshore platforms. Specifically, it offers the following advantages:

[0047] (1) Precise control of the bottoming process: By using four-point symmetrical sensing and force resultant value judgment, the problem of sediment accumulation caused by traditional experience-based judgment is avoided, ensuring that the pile tip makes clean contact with the foundation soil layer;

[0048] (2) Strong height adjustment capability: The hydraulically controlled telescopic section ensures that the casing opening and the ground are always at a reasonable elevation, adapting to uneven terrain and construction sites with height differences;

[0049] Easy installation and transportation: The pile casing 3 adopts standard section modular assembly, which is convenient to transport and can be quickly adapted to different pile length requirements, shortening the construction cycle;

[0050] (3) Segmented bearing, safe and reliable: Through the sliding of inner and outer cylinders and the graded stress design, it is ensured that the inner cylinder bears the entire self-weight of the structure in the end, and the outer cylinder is prevented from penetrating the soil layer too deeply and disturbing the sediment;

[0051] Intelligent identification and data recording: The control system can record data such as bottoming depth and force changes in real time, forming a traceable construction data chain and improving the level of digital construction management;

[0052] (4) Adaptable to various complex environments: This system is particularly suitable for scenarios where it is difficult to drill holes for cast-in-place piles, such as soft foundations, high groundwater levels, and water-rich sand layers, thereby improving the success rate of pile formation and the bearing capacity of the pile tip.

[0053] The above-described specific embodiments are preferred embodiments of the present invention and are not intended to limit the present invention. Any other changes or equivalent substitutions made without departing from the technical solution of the present invention are included within the protection scope of the present invention.

Claims

1. A cast-in-place pile anti-sloughing adjustable steel casing system, characterized in that: The device includes a hydraulic adjustment mechanism, a pile casing, a bottom contact detection device casing, multiple electromagnetic contact sensors, a contact ring, a hydraulic actuator, a signal acquisition unit, and a controller. The lower end of the hydraulic adjustment mechanism is threadedly connected to the upper end of the pile casing via a threaded cylinder. The lower end of the pile casing is threadedly connected to the upper end of the bottom contact detection device casing. The lower end of the bottom contact detection device casing is connected to the contact ring via multiple electromagnetic contact sensors. The contact ring protrudes from the outer circumference of the bottom contact detection device casing. The multiple electromagnetic contact sensors are arranged along the circumference of the contact ring. The controller is connected to the hydraulic adjustment mechanism via the hydraulic actuator. The controller is electrically connected to the multiple electromagnetic contact sensors via the signal acquisition unit. The electromagnetic contact sensor includes a sealed steel block, a permanent magnet ring, an electromagnetic coil, a steel wire, a steel pipe, and an electromagnetic signal capturing sensor. Both ends of the steel pipe are connected to the sealed steel block. The bottom-contact detection device casing is connected to the sealed steel block at the upper end of the steel pipe via the upper end of the steel wire. The middle of the steel wire passes through the center of the permanent magnet ring, and the lower end of the steel wire is connected to the contact ring via the sealed steel block at the lower end of the steel pipe. The electromagnetic coil is wound around the permanent magnet ring. The electromagnetic signal capturing sensor senses the electromagnetic signal of the electromagnetic coil and is electrically connected to the signal acquisition unit. Both ends of the steel pipe are connected to the bottom-contact detection device casing and the contact ring, respectively.

2. The anti-sloughing adjustable steel casing system for cast-in-place piles according to claim 1, characterized in that: The hydraulic adjustment mechanism includes a telescopic sleeve and multiple hydraulic cylinders. The multiple hydraulic cylinders are distributed on the outer periphery of the telescopic sleeve. The two ends of each hydraulic cylinder are connected to the two ends of the telescopic sleeve through threaded cylinders. The multiple hydraulic cylinders are connected to the hydraulic actuator.

3. The anti-sloughing adjustable steel casing system for cast-in-place piles according to claim 2, characterized in that: The telescopic length of the telescopic sleeve includes 1 to 2 meters.

4. The adjustable steel casing system for preventing sedimentation in cast-in-place piles according to claim 1, characterized in that: The pile casing includes multiple casing sections and sealing rings. The multiple casing sections are connected by the sealing rings. The uppermost casing section is connected to the hydraulic adjustment mechanism, and the lowermost casing section is threadedly connected to the bottom contact detection device.

5. The adjustable steel casing system for preventing sedimentation in cast-in-place piles according to claim 4, characterized in that: The lower end of the casing section is provided with a bottom limiting protrusion ring, and the upper end of the casing section is provided with a snap-fit ​​ring and a top limiting protrusion ring. The snap-fit ​​ring and the top limiting protrusion ring form a sealing ring mounting groove. The sealing ring is sleeved in the sealing ring mounting groove. The bottom limiting protrusion ring of one casing section is snapped with the snap-fit ​​ring of another casing section.

6. A method for using an adjustable steel casing system for preventing sedimentation in cast-in-place piles, characterized in that: Includes the following steps: S1. Select an appropriate number of casing sections according to the pile length and assemble them into a pile casing. Pre-install the electromagnetic contact sensor and contact ring on the bottom contact detection device casing. Then connect the pile casing to the bottom contact detection device casing and connect the electromagnetic contact sensor to the controller through the signal acquisition device. S2. The pile casing and the bottom contact detection device casing are lowered synchronously by hoisting, and the hydraulic adjustment mechanism is connected to the upper end of the pile casing through a threaded cylinder. The hydraulic driver is connected to the hydraulic adjustment mechanism to obtain the adjustable steel casing system for preventing sedimentation of cast-in-place piles as described in any one of claims 1 to 5. S3. An adjustable steel casing system for preventing sedimentation in cast-in-place piles is placed into the pile hole, and the controller monitors the pressure value of the electromagnetic contact sensor through a signal acquisition device. S4. When the sum of the pressure values ​​detected by all electromagnetic contact sensors is close to the self-weight of the casing of the bottom contact detection device, the controller determines that the pile casing has touched the bottom. S5. The pressure values ​​detected by each electromagnetic contact sensor are fed back to the controller through the signal acquisition device. The controller determines whether the pressure values ​​are equal. If they are, the controller determines that the pile casing is in a vertical state. Otherwise, the controller controls the hydraulic adjustment mechanism through the hydraulic drive to adjust the verticality of the pile casing. S6. Fix the position of the hydraulic adjustment mechanism to complete the installation of the pile casing.

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