A monitoring device and analysis method for filling coefficient of cast-in-place pile

Abstract

The present invention relates to the technical field of cast-in-place piles, and specifically discloses a monitoring device and an analysis method for the filling coefficient of cast-in-place piles. The monitoring device for the filling coefficient of cast-in-place piles comprises: a conduit bottom pipe, the conduit bottom pipe is used to connect with a casting conduit; a flow metering sensor, the flow metering sensor is arranged in the conduit bottom pipe; a pressure sensor assembly, the pressure sensor assembly is arranged on the outer wall of the conduit bottom pipe; and a monitoring module, the monitoring module is electrically connected to the flow metering sensor and the pressure sensor assembly respectively. The present invention has the advantage of being able to accurately monitor the position of the concrete liquid level of the cast-in-place pile during the pouring process, thereby being able to obtain more refined filling data.

Description

Technical Field

[0001] The invention relates to the technical field of cast-in-place piles, and in particular to a monitoring device and an analysis method for a filling coefficient of a cast-in-place pile. Background Art

[0002] Cast-in-place piles are one of the most commonly used foundation forms in engineering. They are made by drilling holes on site and pouring concrete into piles. A large number of engineering practices have shown that most of the quality problems of cast-in-place piles are caused during the concrete pouring process, especially some serious defects such as broken piles and large areas of mud. Reasonable control of the buried depth of the conduit and attention to the relationship between the pouring volume and the position of the concrete liquid level during the concrete pouring process are important links to ensure the quality of cast-in-place piles. If the concrete conduit is buried too deep, it is easy to cause conduit blockage, resulting in quality problems caused by the interruption of concrete pouring. If the concrete conduit is buried too shallowly or detached from the concrete liquid surface, it is easy to cause quality problems such as floating slurry interlayer, mud inclusion, and broken piles. At present, the main method is to control the lifting speed of the conduit by calculating the position of the concrete liquid level through extensive methods and the personal experience of on-site engineers. The accuracy and efficiency are low, and it is difficult to meet the requirements of precise control of on-site dynamic construction. Due to the difference between the actual pile hole and the theoretical pile hole and the invasion of concrete into the stratum, it is easy to make inaccurate judgments on the position of the concrete liquid level. It can be seen that the existing technology has defects and needs to be solved urgently. Summary of the invention

[0003] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a bored pile filling coefficient monitoring device and analysis method, which has the advantage of being able to accurately monitor the concrete liquid level position of the bored pile during the pouring process, thereby being able to obtain more refined filling data.

[0004] In order to solve the above technical problems, the present invention discloses a first aspect of a bored pile filling coefficient monitoring device, which comprises:

[0005] A conduit bottom pipe, the conduit bottom pipe is used to connect with the casting conduit;

[0006] A flow metering sensor, the flow metering sensor being arranged in the bottom pipe of the conduit;

[0007] A pressure sensor assembly, wherein the pressure sensor assembly is arranged on the outer wall of the bottom tube of the conduit;

[0008] A monitoring module is electrically connected to the flow metering sensor and the pressure sensor assembly respectively.

[0009] As an optional embodiment, the length of the conduit bottom pipe ranges from 3m to 9m.

[0010] As an optional implementation, the pressure sensor assembly includes at least three pressure sensors, and a plurality of the pressure sensors are arranged on the outer wall of the catheter bottom pipe along the height direction of the catheter bottom pipe.

[0011] As an optional implementation, a plurality of the pressure sensors are arranged equidistantly along the height direction of the conduit bottom pipe.

[0012] As an optional implementation, the distance between two adjacent pressure sensors in the height direction of the conduit bottom pipe is less than or equal to 1 m.

[0013] The second aspect of the present invention discloses a method for analyzing the filling coefficient of a bored pile, characterized in that it includes the above-mentioned bored pile filling coefficient monitoring device, and the method comprises:

[0014] S1. Install the conduit bottom pipe at the bottom of the casting conduit, and slowly lower the conduit from the pile hole opening to the inside of the pile hole;

[0015] S2, start data monitoring and pouring concrete, monitor the pressure data on the outer side of the pipe wall collected by the pressure sensor in real time, and calculate the buried depth of the pipe opening of the bottom pipe of the conduit through the monitored pressure data;

[0016] S3, calculating the concrete liquid level elevation according to the buried depth of the nozzle, and when the buried depth of the nozzle increases by a preset value, obtaining the flow data of concrete pouring during the increasing buried depth of the nozzle through a flow metering sensor;

[0017] S4, according to the preset value and the flow data, respectively calculating the pile body filling coefficient and the average cross-sectional radius of the pile body under different concrete liquid level elevations;

[0018] S5. When the buried depth of the pipe mouth exceeds a preset threshold, a pipe removal operation is performed, and the pipe mouth elevation of the bottom pipe of the conduit is adjusted to maintain the buried depth of the pipe mouth between 1m and 6m;

[0019] S6, return to step S2 until the pouring of cast-in-place pile concrete is completed;

[0020] S7. According to the pile body filling coefficient and the average cross-sectional radius of the pile body at different concrete liquid level elevations, a curve of the filling coefficient changing with the pile body depth is drawn, and a three-dimensional contour model of the average cross-section is established.

[0021] As an optional implementation, in step S1, the casting bottom pipe is lowered into the pile hole so that the pipe mouth of the conduit bottom pipe is 0.3m to 0.5m away from the bottom of the hole, and the length of the conduit bottom pipe and the pipe bottom elevation are recorded.

[0022] As an optional implementation, in step S2, calculating the buried depth of the pipe opening of the conduit bottom pipe according to the detected pressure data includes:

[0023] The buried depth of the conduit bottom pipe is calculated based on the conduit bottom pipe length, pipe bottom elevation, number of pressure sensors and pressure data.

[0024] As an optional implementation, the method further includes: collecting design and construction parameters of the cast-in-place piles to be analyzed.

[0025] As an optional embodiment, the design and construction parameters include: concrete grade, total length of casting conduit, length of single-section conduit, bulk density of wall protection mud, pile type, pile bottom elevation, pile top elevation, pile length, pile diameter, number of expansion sections, expansion position and expansion diameter.

[0026] Compared with the prior art, the embodiments of the present invention have the following beneficial effects: it can monitor the pouring flow rate of concrete and the pressure on the outer side of the pipe wall in real time, and through precise data analysis, it can realize dynamic monitoring of the buried depth of the bottom pipe of the guide tube, and then accurately calculate the concrete liquid level elevation and the pile body filling coefficient, so as to achieve the purpose of fine monitoring of the filling coefficient during the bored pile construction process, and significantly improve the quality control level during the bored pile construction process. By further inversion analysis, the variation law of the average radius of the bored pile cross section with the depth is obtained, which provides key data for the optimization of the drilling process. It not only improves the quality of bored piles and reduces construction risks, but also provides important reference data for pile quality evaluation and optimization of drilling technology, which is of great significance to improving the technical level of pile foundation construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of a monitoring device for filling coefficient of a bored pile according to the present invention;

[0028] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0029] Figure 3 A schematic flow chart of a method for analyzing the filling coefficient of a cast-in-place pile according to the present invention;

[0030] Figure 4 A schematic diagram of key parameters in a method for analyzing the filling coefficient of a cast-in-place pile according to the present invention;

[0031] Figure 5 It is a schematic diagram of a sensor pressure data curve in a method for analyzing a filling coefficient of a bored pile according to the present invention;

[0032] Figure 6 A schematic diagram of an offset curve between a pressure data point and a reference line in a method for analyzing a filling coefficient of a cast-in-place pile according to the present invention;

[0033] Figure 7 It is a schematic diagram of the pipe pulling step in a method for analyzing the filling coefficient of a bored pile according to the present invention;

[0034] Figure 8 It is a schematic diagram of a filling coefficient curve in a method for analyzing the filling coefficient of a cast-in-place pile according to the present invention;

[0035] Fig. 9 It is a schematic diagram of the three-dimensional average profile of the pile body in a method for analyzing the filling coefficient of a cast-in-place pile according to the present invention;

[0036] In the figure: 1. bored pile hole wall; 2. steel casing; 3. mud; 4. concrete; 5. casting conduit; 6. bored pile filling coefficient monitoring device; 601. conduit bottom pipe; 602. flow metering sensor; 603. pressure sensor; 604. signal transmission cable; 7. monitoring module.

[0037] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0040] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0041] The invention provides a monitoring device and an analysis method for the filling coefficient of a bored pile.

[0042] like Figure 1-2As shown, the present invention discloses a bored pile filling coefficient monitoring device 6, which includes: a conduit bottom pipe 601, a flow meter sensor, a pressure sensor 603 assembly and a monitoring module 7. The conduit bottom pipe 601 is used to connect with the casting conduit 5. In this embodiment, the conduit bottom pipe 601 can be connected to the bottom of the casting conduit 5 by welding, so that the conduit bottom pipe 601 serves as the bottom pipe of the casting conduit 5; in some other embodiments, the conduit bottom pipe 601 can also be connected to the casting conduit 5 by bolt installation. As long as the conduit bottom pipe 601 can be fixedly installed on the casting conduit 5, This does not limit the specific connection method between the conduit bottom pipe 601 and the pouring conduit 5; the flow metering sensor 602 is installed on the inner wall of the conduit bottom pipe 601 by bolts, and the flow metering sensor 602 is used to obtain the flow data of the concrete 4; the pressure sensor 603 component is arranged on the outer wall of the conduit bottom pipe 601; the monitoring module 7 is electrically connected to the flow metering sensor 602 and the pressure sensor 603 components respectively. In this embodiment, the monitoring module 7 adopts a monitoring computer, and the monitoring computer is connected to the flow metering sensor 602 and the pressure sensor 603 components respectively through a signal transmission cable 604. The length of the conduit bottom pipe 601 ranges from 3m to 9m. In this embodiment, preferably, the length of the conduit bottom pipe 601 is 6m. In some other embodiments, conduit bottom pipes 601 of different lengths can also be used according to actual needs. The pressure sensor 603 assembly includes at least two pressure sensors 603, and the multiple pressure sensors 603 are arranged on the outer wall of the conduit bottom pipe 601 along the height direction of the conduit bottom pipe 601. In this embodiment, the number of pressure sensors 603 is set to eight, and the pressure sensors 603 are fixed on the outer wall of the conduit bottom pipe 601 by screws. In some other embodiments, in order to change the measurement accuracy of the liquid level of the concrete 4, the number of pressure sensors 603 can also be increased or decreased, and the number of pressure sensors 603 is not limited here. The multiple pressure sensors 603 are arranged equidistantly along the height direction of the conduit bottom pipe 601, and the distance between the two pressure sensors 603 in the height direction of the conduit bottom pipe 601 is less than or equal to 1m. Preferably, the distance between the two pressure sensors 603 in the height direction of the conduit bottom pipe 601 is less than or equal to 0.5m. In this embodiment, the distance between the two pressure sensors 603 in the height direction of the conduit bottom pipe 601 is 0.3m.

[0043] like Figure 3 As shown, the second aspect of the present invention discloses a method for analyzing the filling coefficient of a bored pile, characterized in that it includes the above-mentioned bored pile filling coefficient monitoring device 6, and the method includes:

[0044] The design and construction parameters of the bored pile to be analyzed are collected, including the concrete 4 grade C, the total length of the casting pipe 5, the length of a single pipe section, the bulk density γ of the wall slurry 3w , pile type, pile bottom elevation, pile top elevation, pile length L, pile diameter D. When the bored pile to be analyzed is an enlarged pile, the design and construction parameters also include the number of enlarged sections, the enlarged position and the enlarged diameter.

[0045] Step S1, installing the conduit bottom pipe 601 at the bottom of the casting conduit 5, and slowly lowering the conduit from the pile hole mouth to the inside of the pile hole.

[0046] Specifically, before pouring concrete 4, the conduit bottom pipe 601 with the flow metering sensor 602 and the pressure sensor 603 installed is installed at the bottom as the bottom pipe of the pouring conduit 5, and then the pouring conduit 5 is lowered into the pile hole until the pipe opening of the conduit bottom pipe 601 is 0.3m away from the bottom of the hole. The total length l of the pouring conduit 5 and the length l of the ordinary single-section conduit are calculated and recorded. s 、Pipe bottom elevation h b The signal transmission cable 604 can be laid along the pouring conduit 5, connected to the monitoring computer, and the equipment is debugged. After the sensor works normally, the pouring of concrete 4 begins, and data monitoring officially begins.

[0047] Step S2, start data monitoring and start pouring concrete 4, monitor the pressure data on the outer side of the pipe wall collected by the pressure sensor 603 in real time, and calculate the buried depth of the pipe mouth of the conduit bottom pipe 601 through the monitored pressure data.

[0048] Specifically, during the pouring of concrete 4, a monitoring computer is used to receive and obtain the pressure data on the outer side of the pipe wall collected by the pressure sensor 603 in real time, and the buried depth h of the pipe opening of the conduit bottom pipe 601 is analyzed in real time through the received pressure data. m , the specific analysis method is as follows:

[0049] 1. The length of the conduit bottom pipe 601 is recorded as l b , the number of pressure sensors 603 is n, and the spacing between them is The data of the pressure sensors 603 at the upper and lower ends of the catheter bottom tube 601 are respectively recorded as p t With p b , the data of the pressure sensors 603 at other locations are recorded as p from bottom to top. i (i=1,2,3,…,n-2);

[0050] 2. The buried depth of the pipe opening of the conduit bottom pipe 601 can be calculated according to the following formula:

[0051]

[0052] Among them, error is the theoretical error.

[0053] Step S3, calculating the liquid level elevation of the concrete 4 according to the buried depth of the pipe mouth, when the buried depth of the pipe mouth increases by a preset value, obtaining the flow data of the pouring of the concrete 4 during the increasing buried depth of the pipe mouth through the flow metering sensor 602.

[0054] Specifically, through the pipe bottom elevation h b And the buried depth of pipe mouth h m Calculation, concrete 4 liquid level height h = h b +h m When the buried depth of the conduit bottom pipe 601 is h m Added When the concrete pouring flow rate is ΔV, the concrete pouring flow rate in this process is obtained by the flow metering sensor 602, which is recorded as ΔV C .

[0055] Step S4, according to the preset value and the flow data, respectively calculating the pile body filling coefficient and the average cross-sectional radius of the pile body at different concrete 4 liquid level elevations.

[0056] Specifically, the pile filling coefficient at elevation h is calculated by the following formula:

[0057]

[0058] The average cross-sectional radius of the pile body at elevation h can be calculated by the following formula:

[0059]

[0060] Step S5: When the buried depth of the pipe mouth exceeds a preset threshold, the pipe removal operation is performed, and the pipe mouth elevation of the conduit bottom pipe 601 is adjusted to maintain the buried depth of the pipe mouth between 1m and 6m.

[0061] Specifically, when the pipe mouth is buried at a depth of h m When a certain threshold is exceeded, the pipe pulling operation should be started, that is, the pouring of concrete 4 and the collection of monitoring data should be temporarily stopped, and the pouring pipe 5 should be pulled up a certain distance using mechanical equipment to remove the uppermost pipe section (length l) of the pouring pipe 5. s ), and reinstall the rest of the pouring equipment in place. At this time, the pipe opening elevation at the bottom of the conduit should be h b +l s During this process, it should be ensured that the buried depth of the pipe opening at the bottom of the conduit is always between 1m and 6m.

[0062] Step S6, return to step S2 until the pouring of the cast-in-place pile concrete 4 is completed;

[0063] Step S7, according to the pile body filling coefficient and the average cross-sectional radius of the pile body at different concrete liquid level elevations, a curve of the filling coefficient changing with the pile body depth is drawn, and a three-dimensional contour model of the average cross-section is established.

[0064] Specifically, by using the pile filling coefficient F(h) and the average cross-sectional radius R(h) at different elevations, the variation pattern of the filling coefficient with the height and depth of the pile can be plotted, and a three-dimensional contour model of the average cross-section can be established, thereby providing reference data for pile quality evaluation and hole-forming process optimization.

[0065] Through the above-mentioned bored pile filling coefficient monitoring device 6 and analysis method, the pouring flow rate of concrete 4 and the pressure outside the pipe wall can be monitored in real time. Through accurate data analysis, dynamic monitoring of the buried depth of the pipe mouth of the guide tube bottom pipe 601 is realized, and then the liquid level elevation of the concrete 4 and the pile body filling coefficient are accurately calculated, so as to achieve the purpose of fine monitoring of the filling coefficient during the bored pile construction process, and significantly improve the quality control level during the bored pile construction process. By further inversion analysis, the change law of the average radius of the bored pile cross section with the depth is obtained, which provides key data for the optimization of the hole-making process. It not only improves the quality of bored piles and reduces construction risks, but also provides important reference data for pile quality evaluation and optimization of hole-making technology, which is of great significance to improving the technical level of pile foundation construction.

[0066] The following further illustrates the filling coefficient analysis process by applying the solution of the present invention to the monitoring and analysis of the filling coefficient of cast-in-place piles:

[0067] A steel casing 2 is arranged at the pile mouth of the bored pile, and the steel casing 2 is connected to the bored pile hole wall 1. Figure 4 , assuming that the length of the conduit bottom pipe 601 is l b = 6m, the number of pressure sensors 603 is n = 61, the spacing is 0.1m, and the flow metering sensor 602 is installed at the port of the conduit bottom pipe 601. The port elevation h of the conduit bottom pipe 601 b =-26m, ordinary single-section conduit length l s =3.5m. The pile type is a conventional pile, the pile diameter D = 2m, the mud 3 liquid level elevation at the pile hole is 0m, and the mud 3 bulk density is 11kN / m 3 , concrete 4 density is 24kN / m 3 Since the bulk density of concrete 4 is quite different from that of mud 3, according to the fluid mechanics formula, the pressure value inside the fluid can be calculated as follows:

[0068] P(h)=p0+γh

[0069] Where p0 is the pressure value at the reference point, γ is the bulk density of the fluid, and h is the vertical distance from the calculation point to the reference point.

[0070] From the above formula, we can know that the relative pressure value at any point inside the mud 3 in the pile hole is:

[0071] p w (h)=11h

[0072] Where h is the distance from the calculation point to the mud 3 liquid surface at the top of the pile hole. The relative pressure value at any point inside the bottom concrete 4 in the pile hole is:

[0073] p c (h c )=p wb +24h c

[0074] In the formula, h c is the distance from the calculation point to the concrete 4 liquid surface; p wb =11h w , where h w It is the distance from the liquid level of concrete 4 to the liquid level of mud 3.

[0075] Therefore, if Figure 5 As shown, when the liquid level of concrete 4 is located at a certain position in the middle of the bottom pipe 601 of the conduit 601, the distribution curve of the pressure on the outer side of the pipe wall along the height will be a broken line with only one corner, and the interface between concrete 4 and mud 3 is located near the position below the top of the corner (not exceeding 0.1m, the arrangement spacing of pressure sensor 603).

[0076] like Figure 6 As shown, by calculating Figure 5 The distance between each data point and the straight line (reference line) connecting the first and last two data points is not difficult to see that the point with the largest distance is the corner vertex. This process can easily write a program to calculate the liquid level position of concrete 4 through sensor data. The specific calculation method is shown in step S3.

[0077] like Figure 7 As shown, when the buried depth of the conduit bottom pipe 601 is between 5m and 6m, data collection and concrete 4 pouring are suspended, and the pipe is pulled upward using a crane or other equipment to remove the top single section of the conduit to ensure that the buried depth of the concrete 4 of the conduit bottom pipe 601 is always between 1 and 6m.

[0078] When the pouring of cast-in-place pile concrete 4 is completed, a curve of the filling coefficient changing with the pile depth can be drawn. Figure 8 and Fig. 9 , combined with stratum information, the changing law of filling coefficient in different strata can be analyzed, thus providing data support for the optimization of hole-making technology. At the same time, a three-dimensional model of the pile body can be established based on the calculated average cross-sectional radius, which can intuitively determine the shrinkage or expansion of the pile body and provide a reference for the evaluation of pile quality.

[0079] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A method for analyzing the filling coefficient of a cast-in-place pile, characterized in that: The invention comprises a monitoring device for the filling coefficient of a bored pile, which comprises: a conduit bottom pipe, a pressure sensor assembly, a flow metering sensor, and a monitoring module, wherein the conduit bottom pipe is used to be connected with a casting conduit; the flow metering sensor is arranged in the conduit bottom pipe; the pressure sensor assembly is arranged on the outer wall of the conduit bottom pipe; the monitoring module is electrically connected to the flow metering sensor and the pressure sensor assembly respectively; the length of the conduit bottom pipe ranges from 3m to 9m; the pressure sensor assembly comprises at least three pressure sensors, and a plurality of the pressure sensors are arranged on the outer wall of the conduit bottom pipe along the height direction of the conduit bottom pipe; the plurality of the pressure sensors are arranged equidistantly along the height direction of the conduit bottom pipe; the distance between two adjacent pressure sensors in the height direction of the conduit bottom pipe is less than or equal to 1m; the method for analyzing the filling coefficient of a bored pile comprises: S1. Install the conduit bottom pipe at the bottom of the casting conduit, and slowly lower the conduit from the pile hole opening to the inside of the pile hole; S2. Start data monitoring and pouring concrete. Real-time monitoring of the pressure data collected by the pressure sensor on the outer side of the pipe wall. Calculate the buried depth of the pipe mouth of the bottom pipe of the conduit through the monitored pressure data. The calculation process of the buried depth of the pipe mouth is as follows: Among them, l b is the length of the catheter bottom tube, n is the number of pressure sensors, is the distance between pressure sensors, p t With p b The pressure sensors at the upper and lower ends of the bottom tube of the catheter are respectively recorded as p i (i=1,2,3,…,n-2), h m is the buried depth of the pipe mouth, error is the theoretical error; S3, calculating the concrete liquid level elevation according to the buried depth of the nozzle, and when the buried depth of the nozzle increases by a preset value, obtaining the flow data of concrete pouring during the increasing buried depth of the nozzle through a flow metering sensor; S4, according to the preset value and the flow data, respectively calculating the pile body filling coefficient and the average cross-sectional radius of the pile body under different concrete liquid level elevations; S5. When the buried depth of the pipe mouth exceeds a preset threshold, a pipe removal operation is performed, and the pipe mouth elevation of the bottom pipe of the conduit is adjusted to maintain the buried depth of the pipe mouth between 1m and 6m; S6, return to step S2 until the pouring of cast-in-place pile concrete is completed; S7. According to the pile body filling coefficient and the average cross-sectional radius of the pile body at different concrete liquid level elevations, a curve of the filling coefficient changing with the pile body depth is drawn, and a three-dimensional contour model of the average cross-section is established.

2. The method for analyzing the filling coefficient of a cast-in-place pile according to claim 1, characterized in that: In step S1, the casting bottom pipe is lowered into the pile hole so that the pipe mouth of the conduit bottom pipe is 0.3m to 0.5m away from the bottom of the hole, and the length of the conduit bottom pipe and the elevation of the bottom are recorded.

3. The method for analyzing the filling coefficient of a bored pile according to claim 2, characterized in that: In step S2, the buried depth of the pipe opening of the conduit bottom pipe is calculated by the monitored pressure data, including: The buried depth of the conduit bottom pipe is calculated based on the conduit bottom pipe length, pipe bottom elevation, number of pressure sensors and pressure data.

4. The method for analyzing the filling coefficient of a bored pile according to claim 1, characterized in that: Also includes: Collect the design and construction parameters of the bored piles to be analyzed.

5. The method for analyzing the filling coefficient of a bored pile according to claim 4, characterized in that: The design and construction parameters include one or more of the following parameters: concrete grade, total length of casting conduit, length of single-section conduit, bulk density of wall protection mud, pile type, pile bottom elevation, pile top elevation, pile length, pile diameter, number of expansion sections, expansion position and expansion diameter.

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