An automatic positioning system for underwater concrete pile head elevation

Abstract

The application discloses an automatic measuring system for underwater concrete pile head elevation, and relates to the technical field of building construction machinery. The system uses a measuring instrument, which comprises a water pressure sensor, a controller, a display, an alarm, a power module, an electric cylinder, a pressure sensor, a counterweight mechanism, a flow guide pipe and a slurry collecting cover. The measuring method comprises the steps of judging the reached elevation by water pressure and confirming the reached elevation by the electric cylinder. The method can accurately track and measure the height of the pile body during the pouring process of the concrete bored pile, ensure that the discharge port of the guide pipe is always located in the concrete, and ensure that the elevation of the final pile top meets the design requirements, thereby avoiding the problems of over-pouring and under-pouring.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of construction machinery, in particular to an automatic positioning system for underwater concrete pile head elevation. BACKGROUND

[0002] The construction process of a bored pile mainly includes: firstly, site preparation and positioning; then, drilling to the designed depth using a drilling machine, while stabilizing the hole wall by mud protection; after drilling, hole cleaning is performed to ensure the hole bottom is clean; then, a reinforcement cage is installed, and concrete is poured from the hole bottom to the top uniformly using the duct method, ensuring that the duct is always embedded in the concrete to prevent layering and mud inclusion; after pouring, maintenance and quality inspection are performed to ensure the structural stability of the pile and compliance with the design specifications.

[0003] In the above process steps, there are mainly two problems that are difficult to control. One of them is how to ensure that the duct is always embedded in the concrete to prevent the pile body from layering and mud inclusion, which requires the construction personnel to be able to control the elevation of the pile body in real time during the formation of the concrete pile body, so as to control the depth of the duct lowering according to this height, and avoid the duct from separating from the concrete. The other problem is how to accurately determine the elevation of the top of the final pouring. If not controlled properly, two situations may occur: 1) concrete over-pouring, which will cause waste of concrete and additional workload for subsequent removal of the excess pile head. 2) concrete under-pouring, which will cause quality problems of the pile, and in severe cases, will cause the pile to be scrapped, resulting in significant economic losses due to major quality accidents.

[0004] Currently, the measurement of the elevation of the underwater concrete pile head mainly has the following methods:

[0005] (1) Lead plummet measurement method: This method is currently the main method. The construction personnel continuously throws lead plummet downward, and through the touch of the lead plummet hitting the bottom, the top surface elevation of the concrete pouring is sensed, and the pouring depth is known through the length of the plummet rope. This method is reliable, but it requires personnel to be on site continuously to throw lead plummet, which wastes manpower, and if the on-site personnel are irresponsible, management may be lost due to human factors.

[0006] (2) Duct depth control: During pouring, the depth of the duct is controlled and the lifting speed is controlled, and the distance from the top of the duct to the bottom of the duct is measured periodically to estimate the height of the concrete. The defect of this method is inaccuracy.

[0007] (3) Concrete volume calculation: The diameter and depth of the pile are used to accurately calculate the theoretical volume of concrete required. During pouring, the amount of concrete transported to the site is tracked and compared with the theoretical volume. This method calculates based on the theoretical pile diameter, and the main problem is also inaccuracy.

[0008] (4) Marking of equipment such as vertical rod: Marking is set on the reinforcement cage or guide pipe, or vertical rod is set up, so as to monitor the height of concrete pouring in real time. The method is relatively cumbersome and inconvenient to implement.

[0009] (5) Acoustic depth finder: acoustic depth finding equipment is used to detect the position of the top of the concrete pile after pouring. The acoustic technology uses the density difference between concrete and mud to locate the concrete pile head. The method is a post-monitoring method, which has low accuracy and cannot implement process monitoring, and the implementation cost is high.

[0010] (6) Combination of over-pouring method and drilling machine lifting record: the over-pouring method is combined, a certain height is poured above the design elevation, and then the lifting height record is monitored according to the drilling machine. The defect of the method is inaccuracy. SUMMARY

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

[0012] To solve the above problems, the technical scheme of the present application is as follows:

[0013] An automatic positioning system for underwater concrete pile head elevation, comprising a positioning instrument and an elevation positioning method, the positioning instrument comprising a water pressure sensor, a controller, a display, an alarm and a power module, the water pressure sensor being used to monitor the pressure of the mud in the concrete pile drilling hole and being connected to the controller outside the drilling hole through a wire, the controller being electrically connected to the power module and being electrically connected to the display and the alarm through wires respectively.

[0014] Preferably, the probe end of the water pressure sensor is provided with a rubber ball, the rubber ball is filled with water, and the rubber ball is used to prevent the probe from being blocked by silt and affecting the detection result.

[0015] Preferably, the system further comprises a counterweight mechanism, a flow guide pipe and a mounting bracket, the flow guide pipe penetrates the central shaft of the counterweight mechanism, the bottom end of the flow guide pipe is provided with a horn-shaped slurry collecting cover, the probe of the water pressure sensor is arranged in the upper part of the flow guide pipe in an axial direction, the upper end of the probe is connected to the top of the mounting bracket through a connecting pipe, the bottom of the mounting bracket is connected to the top end of the counterweight mechanism, a lifting ring is arranged at the top end of the mounting bracket, and the lifting ring is connected to a lifting rope connected to the winch at the wellhead.

[0016] Preferably, the counterweight mechanism is a spindle structure, the bottom of the counterweight mechanism is uniformly provided with four longitudinal electric cylinders around the axis, the fixed end of the electric cylinder is embedded in the counterweight mechanism, the telescopic end is fixedly connected with a pressing plate, the bottom end of the pressing plate is fixedly connected with a pressure sensor, and the electric cylinder and the pressure sensor are electrically connected with the controller through wires respectively.

[0017] Preferably, the hanging rope is a hollow rope, and the inside of the hollow rope is used to pass through the wires.

[0018] Preferably, the edge of the drilling well mouth is fixedly provided with a support, the top of the support is provided with a cross beam extending above the well mouth, and a winch is installed at the lower end of the cross beam, the winch is driven by a servo motor, and the servo motor is electrically connected with the controller through wires.

[0019] Preferably, the mounting frame comprises an annular plate coaxially arranged with the counterweight mechanism, the outer edge of the annular plate is connected with the top of the counterweight mechanism or the outer wall of the flow guide pipe through connecting rods, a circular plate is coaxially arranged in the annular plate, the circular plate and the annular plate are connected through uniformly distributed connecting rods, the lifting ring is arranged at the top of the circular plate, and the connecting pipe penetrates the circular plate.

[0020] Preferably, the controller is electrically connected with a flow pump for pumping concrete into the guide pipe through wires.

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

[0022] S1: the controller starts, the counterweight mechanism is lowered into the drilling hole to a set depth, and the data A of the water pressure sensor at the depth is recorded;

[0023] S2: the flow pump pumps concrete into the drilling hole through the guide pipe;

[0024] S3: when the top of the concrete pile approaches the counterweight mechanism, due to the impact of the concrete on the mud at the top, the mud at the position begins to surge, the surging mud enters the flow guide pipe through the mud collecting cover, the flow rate of the mud in the flow guide pipe is accelerated, based on Bernoulli's principle, the water pressure in the flow guide pipe is reduced, and at the same time, since the counterweight mechanism is a spindle structure, when the mud surges, the mud flows upward along the outer surface of the spindle structure, the pressure at the upper end of the flow guide pipe is reduced, the flow rate of the mud in the flow guide pipe is further accelerated, so as to further reduce the water pressure, when the water pressure sensor detects that the water pressure is reduced to a set range, it is judged that the top of the pile approaches the counterweight mechanism; the alarm is alarmed, and the concrete flow of the flow pump is reduced;

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

[0026] S5: The guide pipe is pulled up to the set height according to the height of the top end of the pile body at this time through the hoisting mechanism, and the discharge port of the guide pipe is still located in the pile body; at the same time, the counterweight mechanism is pulled up to the set height through the winch, and the water pressure data at this height is recorded;

[0027] S6: Steps S2-S5 are repeated until the pouring of another section of the pile body is completed, and the pouring is stopped when it is detected that the top of the entire pile body reaches the preset elevation position, and the counterweight mechanism is lifted out of the drill hole through the winch.

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

[0029] The application can not only accurately control the elevation of the pile body to avoid over-pouring and under-pouring, but also control the whole process of the pouring of the pile body, so that the guide pipe is always controlled in the concrete, the pile body is prevented from being layered and the mud is prevented from being sandwiched, and the structural strength of the cast-in-place pile is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 The schematic diagram of the main structure of the application;

[0031] Figure 2 The sectional view of the main structure of the application;

[0032] Figure 3 The bottom view of the main structure of the application;

[0033] Figure 4 The top view of the main structure of the application;

[0034] Figure 5 The schematic diagram of the implementation principle of the overall structure of the application;

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

[0036] The following detailed description of the embodiments of the application is merely exemplary in nature and is not intended to limit the scope of the application, as described in the appended claims. Any modification, equivalent replacement and improvement made within the spirit and principle of the application should be included in the scope of the protection of the application.

[0037] In the description of the application, it should be noted that the terms "upper", "lower", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of describing the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, a particular orientation configuration and operation, and therefore cannot be understood as a limitation on the application.

[0038] Example 1

[0039] In the initial embodiment, the application discloses an automatic positioning system for underwater concrete pile head elevation, including a positioning instrument and an elevation positioning method, as shown in Figures 1-5 The positioning instrument 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 drill hole 16, and is signal connected to the controller 20 outside the drill hole 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 respectively.

[0040] In this embodiment, during the pouring process of the cast-in-place pile, when the top of the concrete approaches the position of the water pressure sensor, due to the upward tendency of the concrete, the mud liquid at the top of the concrete is stirred, the pressure of the stirred mud is reduced (similar to the reduction of water pressure when water is boiled, the essence is based on Bernoulli's principle), which is obviously different from the previously measured water pressure. At this time, the controller can determine that the top of the concrete reaches the preset elevation, and then the duct can be pulled up by a certain height, and the duct outlet is still located in the concrete. In this way, the work continues until the pouring of the entire pile body is completed. It can be understood that the application can not only accurately control the elevation of the pile body, avoid the problems of over-pouring and under-pouring, but also control the pouring process of the pile body throughout the process, the duct is always controlled in the concrete, avoiding the stratification and mud of the pile body, and ensuring the structural strength of the cast-in-place pile.

[0041] Example 2

[0042] In a further embodiment, as shown in Figure 3 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 prevents the probe from being blocked by sand, which affects the detection result.

[0043] As shown in Figures 1-5As shown, the position finder further comprises a counterweight mechanism 1, a flow guide pipe 21, and a mounting frame. The flow guide pipe 21 penetrates the counterweight mechanism 1 at the shaft, and the bottom end of the flow guide pipe 21 is provided with a flared end-shaped slurry collecting cover 22. The probe 10 of the water pressure sensor is arranged in the upper part of the flow guide pipe 21 in the axial direction. The upper end of the probe 10 is connected to the top of the mounting frame through a connecting pipe 12 (which serves to connect the probe and to pass through the wires). The bottom of the mounting frame is connected to the top end of the counterweight mechanism 1, and a lifting ring 5 is arranged at the top end of the mounting frame. The lifting ring 5 is connected to a lifting rope 6 which is connected to a winch 19 at the wellhead of the drill hole.

[0044] Embodiment 3

[0045] In further embodiments, as shown in Figures 1-5 the counterweight mechanism 1 is in a spindle structure, and four electric cylinders 7 are arranged in the longitudinal direction at the bottom of the counterweight mechanism 1 around the axis. The electric cylinders 7 are embedded in the counterweight mechanism 1 at the fixed end, and the telescopic end is fixedly connected to a pressing plate 8. The bottom end of the pressing plate 8 is fixedly connected to a pressure sensor 9. The electric cylinders 7 and the pressure sensor 9 are respectively electrically connected to the controller 20 through wires.

[0046] As shown in Figures 1-5 the lifting rope 6 is a hollow rope, and the inside of the hollow rope 6 is used to pass through the wires. A support 18 is fixedly arranged at the edge of the wellhead of the drill hole 16, and a cross beam extending above the wellhead is arranged at the top of the support. A winch 19 is arranged at the lower end of the cross beam. The winch 19 is driven by a servo motor, and the servo motor 19 is electrically connected to the controller 20 through wires.

[0047] The mounting frame comprises 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 pipe 21 through connecting rods 3. A circular plate 15 is coaxially arranged in the annular plate 4. The circular plate 15 and the annular plate 4 are connected through evenly distributed connecting rods 14. The lifting ring 5 is arranged at the top of the circular plate 15. The connecting pipe 12 penetrates the circular plate 15. The controller 20 is electrically connected to a flow pump used to pump concrete into the pipe through wires.

[0048] Embodiment 4

[0049] Based on the above embodiments, the present embodiment discloses a position finding method in an automatic position finding system for underwater concrete pile head elevation, as shown in Figures 1-5 the method comprises the following steps:

[0050] S1: The controller starts, and the counterweight mechanism 1 is lowered into the drill hole 16 to a set depth. The data A of the water pressure sensor at the depth is recorded.

[0051] S2: Pumping concrete into the borehole 16 through the conduit by the flow pump;

[0052] S3: When the top of the concrete pile approaches the counterweight mechanism 1, the mud at this position begins to surge due to the impact of the concrete on the mud at its top, the surging mud enters the flow guide pipe 21 through the mud collecting cover 22, increasing the flow rate of the mud in the flow guide pipe 21, based on Bernoulli's principle, the water pressure in the flow guide pipe 21 decreases, at the same time, due to the spindle shape of the counterweight mechanism 1, when the mud surges, the mud flows upward 23 along the outer surface of the spindle-shaped structure, reducing the pressure at the upper end of the flow guide pipe 21, further increasing the flow rate of the mud in the flow guide pipe 21, to further reduce the water pressure, when the water pressure sensor detects that the water pressure has decreased 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 approaches the counterweight mechanism 1; an alarm is sounded through the alarm, and the concrete flow of the flow pump is reduced; the mud surge caused by the concrete surge will significantly change the water pressure state at the probe, so this change can be easily captured by the controller and displayed through the display; therefore, the decrease in water pressure at this time is a clear indication that the pouring elevation is about to be reached;

[0053] S4: When the concrete at the top of the concrete pile buries the mud collecting cover 22, the mud flow in the flow guide pipe 21 is blocked, the water pressure increases, the controller judges that the height of the pile has reached the set height, in order to avoid misjudgment, then, the four electric cylinders are extended, when the pressure plate is pressed to the top of the pile, the pressure sensor detects the pressure signal, the controller determines that the top of the pile has reached the set height; this step is very important, which can ensure the accuracy of the detection result and guarantee the engineering quality;

[0054] S5: The conduit is pulled up to a set height according to the height of the top of the pile at this time by the hoisting mechanism, and the discharge port of the conduit is still located in the pile; at the same time, the counterweight mechanism 1 is pulled up to a set height by the winch 19, and the water pressure data at this height is recorded;

[0055] S6: Repeat steps S2-S5 until the pouring of another section of the pile is completed, and so on until the pouring of the entire pile is completed, when the top of the entire pile is detected to reach the pre-set elevation position, stop pouring, and lift the counterweight mechanism 1 out of the borehole by the winch 19.

[0056] Example 5

[0057] The step S1: the controller starts, and the counterweight mechanism 1 is lowered into the borehole 16 to a set depth, and the data A of the water pressure sensor at this depth is recorded; in specific implementation, the pile body can be divided into several equal-height segments according to the set height of the cast-in-place pile, and each segment is poured in turn, and the depth of the counterweight mechanism lowered can be in the range of 0.2-0.5 meters below the top elevation of the segment.

[0058] In a further embodiment, the step S1: the controller starts to lower the counterweight mechanism 1 into the drilled hole 16 to a set depth, and records the data A of the water pressure sensor at the depth; in a specific implementation, the pile body can be divided into several segments of equal height according to the set height of the cast-in-place pile, and each segment is poured in turn, and the depth of the lowering of the counterweight mechanism can only make the slurry collecting cover be below the top elevation of the segment.

[0059] In a further embodiment, in the steps S2-S5: the concrete is pumped into the drilled hole 16 through the conduit by the flow pump; the pumping speed of the concrete should be set step by step, that is, during the pouring of the segment, the concrete is first pumped at a faster speed, when the water pressure decreases, the controller judges that the top of the pile body approaches the counterweight mechanism 1, and the pumping speed should be reduced, the slurry flow in the flow guide pipe 21 is blocked, the water pressure increases, the controller judges that the height of the pile body reaches the set height, and the pumping speed should be further reduced, when the electric cylinder confirms that the pile body reaches the set elevation, the original pumping speed of the flow pump can be restored while the conduit is lifted and the counterweight mechanism is moved up, and when the pile top is reached, the flow pump needs to be stopped when the controller judges that the concrete reaches the height of the pile top, and then the conduit is pulled out and the counterweight mechanism is lifted out after the confirmation of the electric cylinder.

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

[0061] In a further embodiment, the difference between the water pressure value when the top of the pile body approaches the counterweight mechanism and the water pressure value when it does not approach should be compared through experiments, and the related data should be provided to the controller as the basis for judging the elevation of the top of the pile body or even the pile top; here, the approach refers to the slurry surge at the top of the pile body caused by pouring, which can make the water pressure sensor detect data within the set range.

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

[0063] In a further embodiment, the water pressure sensor of the present application can also achieve the effect of detecting the slurry pressure through other types of sensors.

Claims

1. An automated system for locating the elevation of the head of a concrete pile underwater, characterized in that: The utility model relates to a kind of automatic positioning system of underwater concrete pile head elevation, and the elevation positioning method of underwater concrete pile head is carried out the automatic positioning of underwater concrete pile head elevation using positioning instrument, and elevation positioning method includes the following steps: Further comprising counterweight mechanism, flow guide pipe, mounting frame, the shaft of the counterweight mechanism is penetrated by flow guide pipe, and the bottom end of flow guide pipe is equipped with the set of slurry cover of flaring mouth shape, the probe of the water pressure sensor is arranged in the upper portion in flow guide pipe along the axial direction of flow guide pipe, and the upper end of probe is connected with the top of mounting frame by connecting pipe, the bottom of mounting frame is connected with the top end of counterweight mechanism, and there is lifting ring on the top of mounting frame, and the lifting ring is connected with the lifting rope connected with the winch of borehole wellhead; The counterweight mechanism is spindle structure, and the bottom of the counterweight mechanism is evenly distributed around the axis line with four electric cylinders arranged in the longitudinal direction, the fixed end of the electric cylinder is embedded in the counterweight mechanism, the telescopic end is fixedly connected with the pressing plate, the bottom end of the pressing plate is fixedly connected with the pressure sensor, and the electric cylinder and the pressure sensor are electrically connected with the controller through wires respectively; The lifting rope is hollow rope, and the inside of the hollow rope is used to pass through wire; The edge of the borehole wellhead is fixedly provided with a support, the top of the support is provided with a cross beam extending above the wellhead, and the winch is installed at the lower end of the cross beam, the winch is driven by a servo motor, and the servo motor is electrically connected with the controller through wires; The controller is electrically connected with the flow pump for pumping concrete into the guide pipe through wires.

2. An automatic positioning system for underwater concrete pile head elevation as claimed in claim 1, characterized in that: The probe end of the water pressure sensor is sealed with a rubber ball, the rubber ball is filled with water, and the rubber ball prevents silt from blocking the probe and affecting the detection results.

3. An automatic positioning system for underwater concrete pile head elevation as claimed in claim 1, 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 with the top of the counterweight mechanism or the outer wall of the flow guide pipe through connecting rods, a circular plate is coaxially arranged in the annular plate, the circular plate and the annular plate are connected by evenly distributed connecting rods, the lifting ring is arranged on the top of the circular plate, and the connecting pipe penetrates the circular plate.

4. A method of locating the elevation of an underwater concrete pile head, characterized by: The automatic positioning system of underwater concrete pile head elevation of any one of claims 1 to 3, the elevation positioning method of underwater concrete pile head is carried out the automatic positioning of underwater concrete pile head elevation using positioning instrument, and elevation positioning method includes the following steps: S1: the controller starts, and the counterweight mechanism is lowered into the borehole to a set depth, and the data A of the water pressure sensor at the depth is recorded; S2: the flow pump pumps concrete into the borehole through the guide pipe; S3: When the top of the concrete pile approaches the counterweight mechanism, the mud at this position begins to surge due to the impact of the concrete on the mud at its top. The surging mud enters the guide pipe through the mud collecting cover, increasing the flow rate of the mud in the guide pipe. Based on Bernoulli's principle, the water pressure in the guide pipe decreases. 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, reducing the pressure at the upper end of the guide pipe and further increasing the flow rate of the mud in the guide pipe, to further reduce the water pressure. When the water pressure sensor detects that the water pressure has decreased to a set range, it is determined that the top of the pile approaches the counterweight mechanism; an alarm is sounded through the alarm, and the concrete flow of the flow pump is reduced; S4: When the concrete at the top of the concrete pile buries the mud collecting cover, the mud flow in the guide pipe is blocked, the water pressure increases, and the controller determines that the pile height reaches the set height. Then, the four electric cylinders are extended, and when the pressure plate is pressed to the top of the pile, the pressure sensor detects the pressure signal, and the controller determines that the top of the pile reaches the set height; S5: The hoisting mechanism pulls the guide pipe up to the set height according to the height of the top of the pile at this time, and the discharge port of the guide pipe is still located in the pile. At the same time, the winch pulls the counterweight mechanism up to the set height, and records the water pressure data at this height; S6: Repeat steps S2-S5 until the pouring of another section of the pile body is completed. In turn, until the pouring of the entire pile body is completed, when the top of the entire pile body reaches the preset elevation position, stop pouring, and pull the counterweight mechanism out of the hole through the winch.

Images