Automatic position measuring system for elevation of underwater concrete pile head

Abstract

The invention discloses an automatic position measuring system for the elevation of an underwater concrete pile head, and relates to the technical field of building construction machinery. A position finder is used in the system and comprises a water pressure sensor, a controller, a display, an alarm, a power supply module, an electric cylinder, a pressure sensor, a counterweight mechanism, a flow guide pipe and a slurry collecting cover. The position measuring method comprises the steps of judging that the elevation is reached through water pressure and confirming that the elevation is reached through the electric cylinder. According to the method, in the pouring process of the cast-in-place concrete pile, the height of the pile body can be accurately tracked and measured, it is guaranteed that the discharging port of the guide pipe is located in concrete all the time, it is guaranteed that the elevation of the final pile top meets the design requirement, and the problems of over-pouring and under-pouring are avoided.

Description

Technical Field

[0001] The invention relates to the technical field of building construction machinery, and in particular to an automatic positioning system for underwater concrete pile head elevation. Background Art

[0002] The construction process of bored cast-in-place piles mainly includes: first, site preparation and positioning and laying out, then use a drilling rig to drill to the designed depth, and at the same time stabilize the hole wall with mud wall; after the drilling is completed, the hole is cleaned to ensure the bottom of the hole is clean; then the steel cage is installed, and the conduit method is used to pour the concrete evenly from the bottom of the hole upwards, ensuring that the conduit is always buried in the concrete to prevent stratification and mud inclusions, and after the pouring is completed, maintenance and quality inspection are carried out to ensure the structural stability of the pile and meet the design specifications.

[0003] There are two main problems in the above process steps that are difficult to control. One of them is how to ensure that the conduit is always buried in the concrete to prevent the pile body from being delaminated and trapped in mud. This requires the construction personnel to be able to control the elevation of the pile body in real time during the formation of the concrete cast-in-place pile body, so as to control the depth of the conduit lowering based on this height to prevent the conduit from being separated from the concrete; the other problem is how to accurately determine the elevation of the final poured pile top. If it is not well controlled, two situations are likely to occur: 1) Over-pouring of concrete will cause waste of concrete and unnecessary work in the subsequent removal of the pile head. 2) Under-pouring of concrete will cause quality problems in the pile, and in severe cases, it will cause waste of piles, resulting in major quality accidents and major economic losses.

[0004] At present, there are mainly the following methods for measuring the elevation of underwater concrete pile heads:

[0005] (1) Plumb measurement method: This method is the main method at present. Construction workers continuously throw plumb down. By the touch of the plumb down, they can sense the top elevation of the concrete pouring and know the pouring depth by the length of the plumb rope. This method is reliable, but it requires personnel to continuously throw plumb down on site, which wastes manpower. If the on-site personnel are irresponsible, management deficiencies may occur due to human factors.

[0006] (2) Conduit depth control: During the pouring process, the depth and lifting speed of the conduit are controlled, and the distance from the top to the bottom of the conduit is regularly measured to estimate the height of the concrete. The disadvantage of this method is that it is inaccurate.

[0007] (3) Concrete volume calculation: Based on the diameter and depth of the pile, the theoretically required concrete volume is accurately calculated. During the pouring process, the amount of concrete transported to the site is tracked and compared with the theoretical volume. This method is based on the theoretical pile diameter, and the main problem is that it is inaccurate.

[0008] (4) Marking equipment such as poles: Marking or setting up vertical poles on the steel cage or conduit, and using this as a reference to monitor the height of concrete pouring in real time. This method is relatively clumsy and inconvenient to implement.

[0009] (5) Sonic depth sounder: Use sonic depth sounder to detect the position of the top of the concrete pile after pouring. Sonic technology uses the density difference between concrete and mud to locate the concrete pile head. This method is a post-monitoring method with low accuracy, inability to implement process monitoring, and high implementation cost.

[0010] (6) Over-pouring method combined with drilling rig lifting record: Combined with the over-pouring method, a certain height is estimated to be poured beyond the design elevation, and then the lifting height of the drilling rig is recorded and monitored. The disadvantage of this method is that it is inaccurate. Summary of the invention

[0011] Based on the problems existing in the prior art, the present invention provides an automated positioning system for the elevation of an underwater concrete pile head, which can accurately track and measure the height of the pile body during the pouring of concrete bored piles, ensure that the discharge port of the conduit is always located in the concrete, and ensure that the final elevation of the pile top meets the design requirements, avoiding the problems of over-filling and under-filling.

[0012] To solve the above problems, the technical solution of the present invention is:

[0013] An automated positioning system for underwater concrete pile head elevation comprises a positioning instrument and an elevation positioning method. The positioning instrument comprises a water pressure sensor, a controller, a display, an alarm and a power module. The water pressure sensor is used to monitor the pressure of mud in a concrete pile borehole and is connected to a controller signal outside the borehole through a wire. The controller is electrically connected to the power module and is electrically connected to the display and the alarm through wires.

[0014] Preferably, the sealing sleeve at the end of the probe of the water pressure sensor is provided with a rubber ball, and the rubber ball is filled with water, so that the rubber ball can prevent mud and sand from clogging the probe and affecting the detection result.

[0015] Preferably, it also includes a counterweight mechanism, a guide pipe, and a mounting frame, wherein the guide pipe passes through the central axis of the counterweight mechanism, and a trumpet-shaped slurry collecting cover is provided at the bottom end of the guide pipe. The probe of the water pressure sensor is axially arranged at the upper part of the guide pipe, and the upper end of the probe is connected to the top of the mounting frame through a connecting pipe. The bottom of the mounting frame is connected to the top of the counterweight mechanism, and a lifting ring is provided at the top of the mounting frame, and the lifting ring is connected to a lifting rope connected to a winch at the wellhead of the drilling well.

[0016] Preferably, the counterweight mechanism is a spindle-shaped structure, and four electric cylinders arranged longitudinally are evenly distributed around the axis at the bottom of the counterweight mechanism, the fixed end of the electric cylinder is embedded in the counterweight mechanism, the telescopic end is fixedly connected to a pressure plate, and the bottom end of the pressure plate is fixedly connected to a pressure sensor, and the electric cylinder and pressure sensor are electrically connected to the controller through wires respectively.

[0017] Preferably, the suspension rope is a hollow rope, and the inside of the hollow rope is used to pass the conductor.

[0018] Preferably, a bracket is fixedly provided at the edge of the drilling wellhead, a beam extending to the top of the wellhead is provided on the top of the bracket, a winch is installed at the lower end of the beam, the winch is driven by a servo motor, and the servo motor is electrically connected to the controller through a wire.

[0019] Preferably, the mounting frame includes an annular plate coaxially arranged with the counterweight mechanism, the outer edge of the annular plate is connected to the top of the counterweight mechanism or the outer wall of the guide tube through a connecting rod, a circular plate is coaxially arranged inside the annular plate, the circular plates are connected to each other through evenly distributed connecting rods, the lifting ring is arranged at the top of the circular plate, and the connecting tube passes through the circular plate.

[0020] Preferably, the controller is electrically connected to a flow pump for pumping concrete into the conduit via a wire.

[0021] Preferably, the elevation positioning method comprises the following steps:

[0022] S1: The controller starts, puts the counterweight mechanism into the drill hole to a set depth, and records the data A of the water pressure sensor at the depth;

[0023] S2: Pumping concrete into the borehole via the conduit by means of a flow pump;

[0024] S3: When the top of the concrete pile body approaches the counterweight mechanism, the mud at this position begins to surge due to the impact of the concrete on the mud at the top. The surging mud enters the guide pipe through the slurry collecting cover, which accelerates the flow rate of the mud in the guide pipe. Based on the Bernoulli principle, the water pressure in the guide pipe is reduced. At the same time, since the counterweight mechanism is spindle-shaped, when the mud surges, the mud flows upward along the outer surface of the spindle-shaped structure, driving the pressure at the upper port of the guide pipe to decrease, further accelerating the flow rate of the mud in the guide pipe, so as to further reduce the water pressure. When the water pressure sensor detects that the water pressure drops to the set range, it is judged that the top of the pile body is close to the counterweight mechanism; an alarm is sounded through the alarm, and the concrete flow of the flow pump is reduced;

[0025] S4: When the concrete on the top of the concrete pile body buries the slurry collecting cover, the slurry flow in the guide pipe is blocked, the water pressure increases, and the controller determines that the pile body height reaches the set height, then starts the four electric cylinders to extend, and when the pressure plate squeezes the top of the pile body, the pressure sensor detects a pressure signal, and the controller determines that the top of the pile body reaches the set height;

[0026] S5: The guide tube is pulled up to a set height by the lifting mechanism according to the height of the top of the pile body at this time, and the discharge port of the guide tube is still located inside the pile body; at the same time, the counterweight mechanism is pulled up to a set height by the winch, and the water pressure data at this height is recorded;

[0027] S6: Repeat steps S2-S5 until another section of the pile body is cast, and so on until the entire pile body is cast. When it is detected that the top of the entire pile body reaches the preset elevation, the casting is stopped, and the counterweight mechanism is hoisted out of the borehole by a winch.

[0028] The automatic positioning system for underwater concrete pile head elevation of the present invention has the following beneficial effects:

[0029] The present invention can not only accurately control the elevation of the pile body to avoid the problems of over-pouring and under-pouring, but also fully control the process of pouring the pile body. The conduit is always controlled in the concrete, avoiding pile body stratification and mud inclusion, and ensuring the structural strength of the cast-in-place pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 , a schematic diagram of the main structure of the present invention;

[0031] Figure 2 , a cross-sectional view of the main structure of the present invention;

[0032] Figure 3 , a bottom view of the main structure of the present invention;

[0033] Figure 4 , a top view of the main structure of the present invention;

[0034] Figure 5 , a schematic diagram of the implementation principle of the overall structure of the present invention;

[0035] 1: counterweight mechanism, 2: flow guide mechanism, 3: connecting rod, 4: annular plate, 5: lifting ring, 6: lifting rope, 7: electric cylinder, 8: pressure plate, 9: pressure sensor, 10: probe, 11: rubber ball, 12: connecting pipe, 13: wire, 14: connecting rod, 15: circular plate, 16: drilling hole, 17: preset elevation position of the top of the pile body, 18: bracket, 19: winch, 20: controller; 21: flow guide pipe, 22: slurry collecting cover, 23: mud flows upward along the outer surface of the spindle-shaped structure. DETAILED DESCRIPTION

[0036] The following describes in detail the implementation mode of the present invention in a step-by-step manner. The description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0037] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “top”, “bottom”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the purpose of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, and a specific direction structure and operation, and therefore cannot be understood as a limitation on the present invention.

[0038] Example 1

[0039] In the initial embodiment, the present invention discloses an automatic positioning system for underwater concrete pile head elevation, including a positioning instrument and an elevation positioning method, such as Figure 1-5 As shown, the position finder includes a water pressure sensor, a controller 20, a display, an alarm and a power module. The water pressure sensor is used to monitor the pressure of the mud in the concrete pile borehole 16, and is connected to the controller 20 outside the borehole 16 through a wire. The controller 20 is electrically connected to the power module, and is electrically connected to the display and the alarm through wires.

[0040] In this embodiment, during the pouring of the cast-in-place pile, when the top of the concrete approaches the position of the water pressure sensor, the concrete tends to surge upward, driving the mud liquid on its top to surge, and the pressure of the surging mud decreases (similar to the water pressure decrease when water boils, which is essentially based on the Bernoulli principle), which is significantly different from the water pressure measured in advance. At this time, the controller can determine that the top of the concrete has reached a preset elevation, and then can pull the conduit upward to a certain height, and ensure that the conduit outlet is still located in the concrete, and continue to operate until the pouring of the entire pile body is completed. It can be understood that the present invention can not only accurately control the elevation of the pile body, avoiding the problem of over-pouring and under-pouring, but also control the whole process of the pile body pouring. The conduit is always controlled in the concrete, avoiding the pile body stratification and mud inclusion, and ensuring the structural strength of the cast-in-place pile.

[0041] Example 2

[0042] In a further embodiment, Figure 3 As shown, a sealing sleeve at the end of the probe 10 of the water pressure sensor is provided with a rubber ball 11, and the rubber ball 11 is filled with water. The rubber ball 11 is used to block the probe and prevent mud and sand from clogging the probe and affecting the detection result.

[0043] like Figure 1-5As shown, the position finder also includes a counterweight mechanism 1, a flow guide tube 21, and a mounting frame. The counterweight mechanism 1 is provided with a flow guide tube 21 at its central axis, and a trumpet-shaped slurry collecting cover 22 is provided at the bottom end of the flow guide tube 21. The probe 10 of the water pressure sensor is axially arranged at the upper part of the flow guide tube 21, and the upper end of the probe 10 is connected to the top of the mounting frame through a connecting tube 12 (which serves to connect the probe and is also used to pass the wire). The bottom of the mounting frame is connected to the top of the counterweight mechanism 1, and a lifting ring 5 is provided at the top of the mounting frame. The lifting ring 5 is connected to a lifting rope 6 connected to a winch 19 at the wellhead of the drilling well.

[0044] Example 3

[0045] In a further embodiment, Figure 1-5 As shown, the counterweight mechanism 1 is a spindle-shaped structure, and four electric cylinders 7 (sealed, waterproof and anti-corrosion treated) are evenly distributed along the longitudinal direction around the axis at the bottom of the counterweight mechanism 1. The fixed end of the electric cylinder 7 is embedded in the counterweight mechanism 1, and the telescopic end is fixedly connected to a pressure plate 8, and the bottom end of the pressure plate 8 is fixedly connected to a pressure sensor 9. The electric cylinder 7 and the pressure sensor 9 are electrically connected to the controller 20 through wires respectively.

[0046] like Figure 1-5 As shown, the suspension rope 6 is a hollow rope, and the inside of the hollow rope 6 is used to pass the wire. A bracket 18 is fixedly provided at the edge of the wellhead of the borehole 16, and a crossbeam extending to the top of the wellhead is provided on the top of the bracket. A winch 19 is installed at the lower end of the crossbeam. The winch 19 is driven by a servo motor, and the servo motor 19 is electrically connected to the controller 20 through a wire.

[0047] The mounting frame includes an annular plate 4 coaxially arranged with the counterweight mechanism 1, the outer edge of the annular plate 4 is connected to the top of the counterweight mechanism 1 or the outer wall of the flow guide tube 21 through a connecting rod 3, a circular plate 15 is coaxially arranged inside the annular plate 4, the circular plate 15 and the annular plate 4 are connected through evenly distributed connecting rods 14, the hanging ring 5 is arranged on the top of the circular plate 15, and the connecting tube 12 passes through the circular plate 15. The controller 20 is electrically connected to a flow pump for pumping concrete into the conduit through a wire.

[0048] Example 4

[0049] Based on the above embodiments, this embodiment discloses a positioning method in an automatic positioning system for underwater concrete pile head elevation, such as Figure 1-5 As shown, the following steps are included:

[0050] S1: The controller starts, puts the counterweight mechanism 1 into the borehole 16 to a set depth, and records the data A of the water pressure sensor at the depth;

[0051] S2: Pumping concrete into the borehole 16 via the conduit by means of a flow pump;

[0052] S3: When the top of the concrete pile body approaches the counterweight mechanism 1, due to the impact of the concrete on the mud on the top of the pile body, the mud in this part begins to surge, and the surging mud enters the guide pipe 21 through the slurry collecting cover 22, so that the flow rate of the mud in the guide pipe 21 is accelerated. Based on the Bernoulli principle, the water pressure in the guide pipe 21 is reduced. At the same time, since the counterweight mechanism 1 is spindle-shaped, when the mud surges, the mud flows upward along the outer surface of the spindle-shaped structure 23, driving the pressure at the upper port of the guide pipe 21 to decrease, further accelerating the flow rate of the mud in the guide pipe 21, so as to further reduce the water pressure. When the water pressure sensor detects that the water pressure is reduced to a set range (the set range here can be obtained according to experiments or mathematical calculations), it is judged that the top of the pile body is close to the counterweight mechanism 1; an alarm is sounded through the alarm, and the concrete flow rate of the flow pump is reduced; since the surging of mud caused by the surging of concrete will significantly change the water pressure state at the probe, the change can be easily captured by the controller and displayed on the display; therefore, the reduction in water pressure at this time is an obvious reminder that the casting elevation is about to be reached;

[0053] S4: When the concrete on the top of the concrete pile body buries the slurry collecting cover 22, the slurry flow in the guide pipe 21 is blocked, the water pressure increases, and the controller determines that the pile body height reaches the set height. In order to avoid misjudgment, the four electric cylinders are then started to extend. When the pressure plate is squeezed to the top of the pile body, the pressure sensor detects a pressure signal, and the controller determines that the top of the pile body reaches the set height. This step of confirmation is very important to ensure the accuracy of the test results and the quality of the project.

[0054] S5: Pull up the conduit to a set height by the lifting mechanism according to the height of the top of the pile body at this time, and make the discharge port of the conduit still located in the pile body; at the same time, pull up the counterweight mechanism 1 to a set height by the winch 19, and record the water pressure data at this height;

[0055] S6: Repeat steps S2-S5 until another section of the pile body is cast, and so on until the entire pile body is cast. When it is detected that the top of the entire pile body reaches the preset elevation, the casting is stopped, and the counterweight mechanism 1 is lifted out of the borehole by the winch 19.

[0056] Example 5

[0057] The step S1: the controller is started, the counterweight mechanism 1 is placed into the set depth in the borehole 16, and the data A of the water pressure sensor at the depth is recorded; in specific implementation, the pile body can be divided into several sections of equal height according to the set height of the bored pile, and each section is cast in turn, and the depth of the counterweight mechanism can be within the range of 0.2-0.5 meters below the elevation of the top of the section.

[0058] In a further embodiment, step S1: the controller is started, the counterweight mechanism 1 is lowered into the borehole 16 to a set depth, and the data A of the water pressure sensor at the depth is recorded; in specific implementation, the pile body can be divided into several sections of equal height according to the set height of the bored pile, and each section is cast in turn, and the depth of the lowering of the counterweight mechanism can only make the slurry collecting cover be located below the top elevation of the section.

[0059] In a further embodiment, in the steps S2-S5: concrete is pumped into the borehole 16 via the conduit by a flow pump; the speed of pumping concrete should be set in steps, that is, in the process of pouring sections, concrete is first pumped at a faster speed. When the water pressure decreases, the controller determines that the top of the pile body is close to the counterweight mechanism 1 and the pumping speed should be reduced. The mud flow in the guide pipe 21 is blocked, the water pressure increases, and the controller determines that the pile body height reaches the set height, and the pumping speed should be further reduced. When the electric cylinder confirms that the pile body has reached the set elevation, the initial pumping speed of the flow pump can be restored while lifting the conduit and moving the counterweight mechanism upward. When the pile top is reached, it is necessary to stop the flow pump when the controller determines that the concrete has reached the pile top height, and after confirmation by the electric cylinder, pull out the conduit and raise the counterweight mechanism.

[0060] In a further embodiment, in step S3, mud surge will cause the water pressure in the guide tube to decrease, and the water pressure range used as a basis for judgment can be obtained through experiments. Since the density of the mud in each borehole may be different, the correlation between the depth of the probe, the mud density, the pumping speed of the flow pump, the inner diameter of the borehole and the pressure value detected by the water pressure sensor can be verified through experiments, and a database of the setting range of the water pressure sensor detection value corresponding to different depths, different mud densities, different pumping speeds of the flow pump, and different inner diameters of the borehole can be established.

[0061] In a further embodiment, the difference in water pressure values ​​when the top of the pile body is close to the counterweight mechanism and when it is not close should be compared experimentally, and the relevant data should be provided to the controller as a basis for judging the top of the pile body or even the elevation of the pile top; the proximity here refers to the mud surge at the top of the pile body caused by pouring, which can enable the water pressure sensor to detect data within the set range.

[0062] In a further embodiment, the influence of the pumping speed of the flow pump on the mud surge at the top of the pile body or the top of the pile is verified by experiments, so that the mud surge amplitude is sufficient to make the detection value of the water pressure sensor within the set range.

[0063] In a further embodiment, the water pressure sensor of the present invention may also detect mud pressure through other types of sensors.

Claims

1. An automatic positioning system for underwater concrete pile head elevation, characterized by: The invention comprises a positioning instrument and an elevation positioning method. The positioning instrument comprises a water pressure sensor, a controller, a display, an alarm and a power supply module. The water pressure sensor is used to monitor the pressure of mud in the concrete pile borehole and is connected to the controller signal outside the borehole through a wire. The controller is electrically connected to the power supply module and is respectively electrically connected to the display and the alarm through a wire. The elevation positioning method is to use the positioning instrument to automatically position the elevation of the underwater concrete pile head.

2. The automatic positioning system for underwater concrete pile head elevation as claimed in claim 1, characterized in that: The sealing sleeve at the end of the probe of the water pressure sensor is provided with a rubber ball, and the rubber ball is filled with water. The rubber ball is used to block the probe and prevent mud and sand from clogging the probe and affecting the detection result.

3. The automatic positioning system for underwater concrete pile head elevation as claimed in claim 2, characterized in that: It also includes a counterweight mechanism, a guide pipe, and a mounting frame. The guide pipe runs through the central axis of the counterweight mechanism, and a trumpet-shaped slurry collecting cover is provided at the bottom of the guide pipe. The probe of the water pressure sensor is axially arranged at the upper part of the guide pipe, and the upper end of the probe is connected to the top of the mounting frame through a connecting pipe. The bottom of the mounting frame is connected to the top of the counterweight mechanism, and a lifting ring is provided at the top of the mounting frame. The lifting ring is connected to a lifting rope connected to a winch at the wellhead of the drilling well.

4. The automatic positioning system for underwater concrete pile head elevation as claimed in claim 3, characterized in that: The counterweight mechanism is a spindle-shaped structure, and four electric cylinders arranged longitudinally are evenly distributed around the axis at the bottom of the counterweight mechanism. The fixed end of the electric cylinder is embedded in the counterweight mechanism, and the telescopic end is fixedly connected to a pressure plate, and the bottom end of the pressure plate is fixedly connected to a pressure sensor. The electric cylinder and pressure sensor are electrically connected to the controller through wires respectively.

5. The automatic positioning system for underwater concrete pile head elevation as claimed in claim 4, characterized in that: The suspension rope is a hollow rope, and the inside of the hollow rope is used to pass the conductor.

6. The automatic positioning system for underwater concrete pile head elevation as claimed in claim 5, characterized in that: A bracket is fixedly provided at the edge of the borehole wellhead, a beam extending to the top of the wellhead is provided on the top of the bracket, a winch is installed at the lower end of the beam, the winch is driven by a servo motor, and the servo motor is electrically connected to the controller through a wire.

7. The automatic positioning system for underwater concrete pile head elevation as claimed in claim 6, characterized in that: The mounting frame includes an annular plate coaxially arranged with the counterweight mechanism, the outer edge of the annular plate is connected to the top of the counterweight mechanism or the outer wall of the guide tube through a connecting rod, a circular plate is coaxially arranged inside the annular plate, the circular plates are connected to each other through evenly distributed connecting rods, the lifting ring is arranged at the top of the circular plate, and the connecting tube passes through the circular plate.

8. The automatic positioning system for underwater concrete pile head elevation as claimed in claim 7, characterized in that: The controller is electrically connected to a flow pump for pumping concrete into the conduit through a wire.

9. The automatic positioning system for underwater concrete pile head elevation as claimed in claim 8, characterized in that: The elevation measurement method includes the following steps: S1: The controller starts, puts the counterweight mechanism into the drill hole to a set depth, and records the data A of the water pressure sensor at the depth; S2: Pumping concrete into the borehole via the conduit by means of a flow pump; S3: When the top of the concrete pile body approaches the counterweight mechanism, the mud at this position begins to surge due to the impact of the concrete on the mud at the top. The surging mud enters the guide pipe through the slurry collecting cover, which accelerates the flow rate of the mud in the guide pipe. Based on the Bernoulli principle, the water pressure in the guide pipe is reduced. At the same time, since the counterweight mechanism is spindle-shaped, when the mud surges, the mud flows upward along the outer surface of the spindle-shaped structure, driving the pressure at the upper port of the guide pipe to decrease, further accelerating the flow rate of the mud in the guide pipe, so as to further reduce the water pressure. When the water pressure sensor detects that the water pressure drops to the set range, it is judged that the top of the pile body is close to the counterweight mechanism; an alarm is sounded through the alarm, and the concrete flow of the flow pump is reduced; S4: When the concrete on the top of the concrete pile body buries the slurry collecting cover, the slurry flow in the guide pipe is blocked, the water pressure increases, and the controller determines that the pile body height reaches the set height, then starts the four electric cylinders to extend, and when the pressure plate squeezes the top of the pile body, the pressure sensor detects a pressure signal, and the controller determines that the top of the pile body reaches the set height; S5: The guide tube is pulled up to a set height by the lifting mechanism according to the height of the top of the pile body at this time, and the discharge port of the guide tube is still located inside the pile body; at the same time, the counterweight mechanism is pulled up to a set height by the winch, and the water pressure data at this height is recorded; S6: Repeat steps S2-S5 until another section of the pile body is cast, and so on until the entire pile body is cast. When it is detected that the top of the entire pile body reaches the preset elevation, the casting is stopped, and the counterweight mechanism is hoisted out of the borehole by a winch.

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