A method, equipment and system for detecting the verticality of pile foundations in green buildings.

Abstract

This application relates to the field of pile foundation verticality testing technology, specifically to a method, equipment, and system for testing the verticality of green building pile foundations. The method includes: symmetrically pre-embedding two inclinometer tubes inside the pile foundation; obtaining the measured inclination angles of measurement points at different depths within the two inclinometer tubes at different time periods; obtaining the measured land deformation error at each measurement point at each time period; obtaining the spatial and spatiotemporal availability of the measured land deformation error at each measurement point at each time period; constructing a comprehensive function of the land deformation error changing over time, assigning importance to the measured land deformation error through spatiotemporal availability when solving the comprehensive function; obtaining the true inclination angle of the pile body at each measurement point at each time period, thereby obtaining the true verticality of the pile foundation at each time period. This application aims to improve the accuracy of pile foundation verticality testing results by improving the accuracy of pile inclination angle detection.

Description

Technical Field

[0001] This application relates to the field of pile foundation verticality detection technology, specifically to a method, equipment and system for detecting the verticality of green building pile foundations. Background Technology

[0002] Green building pile foundations are load-bearing structures built using environmentally friendly materials such as recycled concrete and eco-friendly cement. They are used to transfer the building's load to deep, stable soil layers, ensuring the building's safety and stability. The verticality of the pile foundation is crucial; excessive deviation can lead to eccentric stress, reduced bearing capacity, and even structural instability, while also affecting settlement uniformity and seismic performance. Therefore, pile foundation verticality testing is essential, typically using a portable digital pipe pile inclinometer. This instrument utilizes the characteristic of a pendulum maintaining a vertical orientation under gravity. A sensor converts the mechanical inclination angle into an electrical signal, ultimately providing a digital inclination value that reflects the pile's tilt state.

[0003] When constructing green buildings on soft soil foundations, ultra-long precast pile foundations are often used to improve load-bearing stability. However, soft soil foundations have weak physical and mechanical properties and are prone to significant and uneven settlement under external loads. Settlement of the soil around the pile will cause additional deformation of the inclinometer tube embedded in the pile, causing the inclination angle measured by the sensor to include "soil deformation error," resulting in distorted detection results that cannot accurately reflect the actual vertical state of the pile foundation. Summary of the Invention

[0004] In view of the above, it is necessary to provide a method, equipment, and system for detecting the verticality of green building pile foundations. Compared with traditional methods for detecting the verticality of green building pile foundations, this method improves the accuracy of the pile foundation verticality detection results by increasing the accuracy of the pile inclination angle detection.

[0005] In a first aspect, embodiments of this application provide a method for detecting the verticality of green building pile foundations, the method comprising the following steps:

[0006] Two inclinometer tubes are symmetrically embedded inside the pile foundation to obtain the measured inclination angle of the measurement points at different depths in the two inclinometer tubes at different time periods, and then obtain the measured land deformation error at each measurement point at different time periods.

[0007] By analyzing the changes in measured land deformation errors at neighboring measurement points during different time periods, the spatial availability of measured land deformation errors at each measurement point during each time period is obtained. Then, the measured land deformation errors at each measurement point during each time period are compared with those of its neighboring time periods to obtain the spatiotemporal availability of measured land deformation errors at each measurement point during each time period, which is used to assess the reliability of the measured land deformation errors. Based on the settlement characteristics of the soil where the pile foundation is located, a comprehensive function of land deformation error changing with time is constructed, in which unknown parameters exist. When solving the comprehensive function, the spatiotemporal availability is used to assign importance to the measured land deformation errors. The theoretical land deformation errors at each measurement point during each time period are obtained through the solved comprehensive function. Combined with the measured tilt angle and the measured land deformation error, the true tilt angle of the pile body at each measurement point during each time period is obtained, and thus the true verticality of the pile foundation during each time period is obtained.

[0008] In one embodiment, the measured land deformation error is the average difference between the measured tilt angles of each measurement point in the two inclinometer tubes at each time period.

[0009] In one embodiment, the process of obtaining the space availability is as follows:

[0010] Calculate the difference in measured land deformation error between each measurement point and its predecessor in each time period, and the deviation amount compared with the difference in measured land deformation error between the previous measurement point and its predecessor.

[0011] When the measured land deformation error at each measurement point in each time period is greater than or equal to the measured land deformation error at the previous measurement point, the spatial availability is inversely proportional to the deviation; otherwise, the spatial availability is 0.

[0012] In one embodiment, the process of obtaining the spatiotemporal availability is as follows:

[0013] Calculate the sum of the spatial availability of the measured land deformation error at each measurement point in each time period and the previous time period;

[0014] If the measured land deformation error of each measurement point in each time period is greater than or equal to the measured land deformation error of each measurement point in the previous time period, the product of the sum and 1 is taken as the confidence level of the measured land deformation error at each measurement point in each time period; otherwise, 0 is taken as the confidence level of the measured land deformation error at each measurement point in each time period.

[0015] The spatiotemporal availability is obtained by comprehensively considering the reliability of the measured land deformation errors of each measurement point in each time period and its neighboring time periods.

[0016] In one embodiment, the spatiotemporal availability is the product of the reliability of the measured land deformation error of each measurement point in each time period and the previous time period.

[0017] In one embodiment, assigning importance to the measured land deformation error through the spatiotemporal availability includes:

[0018] The objective function of the comprehensive function is the weighted sum of the squared differences between the measured land deformation error and the estimated land deformation error of the comprehensive function, wherein the weight of the squared difference is the spatiotemporal availability of the corresponding measured land deformation error.

[0019] In one embodiment, the process of obtaining the actual tilt angle of the pile body is as follows:

[0020] Calculate the average value of the measured tilt angles of each measurement point in the two inclinometer tubes at each time period;

[0021] Calculate the difference between the measured land deformation error and the theoretical land deformation error at each measurement point during each time period; use the difference to correct the average value to obtain the true tilt angle of the pile.

[0022] In one embodiment, the actual tilt angle of the pile is the sum of the average value and the difference.

[0023] Secondly, this application also provides a green building pile foundation verticality testing device, the device comprising:

[0024] The tilt angle acquisition module is used to symmetrically pre-embed two inclinometer tubes inside the pile foundation to obtain the measured tilt angle of the measurement points at different depths in the two inclinometer tubes at different time periods, and then obtain the measured land deformation error at each measurement point at different time periods.

[0025] The tilt angle correction module is used to analyze the changes in measured land deformation error at neighboring measurement points of each measurement point in different time periods, obtain the spatial availability of the measured land deformation error at each measurement point in different time periods, and then compare the measured land deformation error of each measurement point with that of its neighboring time periods to obtain the spatiotemporal availability of the measured land deformation error at each measurement point in different time periods, which is used to evaluate the reliability of the measured land deformation error. Based on the settlement characteristics of the soil where the pile foundation is located, a comprehensive function of land deformation error changing with time is constructed, in which there are unknown parameters. When solving the comprehensive function, the spatiotemporal availability is used to assign importance to the measured land deformation error. The theoretical land deformation error at each measurement point in different time periods is obtained through the solved comprehensive function, and combined with the measured tilt angle and the measured land deformation error, the true tilt angle of the pile body at each measurement point in different time periods is obtained.

[0026] The verticality detection module is used to obtain the true verticality of the pile foundation at different time periods.

[0027] Thirdly, this application also provides a green building pile foundation verticality detection system, including a memory, a processor, and a computer program stored in the memory and running on the processor. When the processor executes the computer program, it implements the steps of any of the above-described green building pile foundation verticality detection methods.

[0028] This application has at least the following beneficial effects:

[0029] This application effectively eliminates common-mode errors caused by external interference such as construction vibration and probe jamming by symmetrically arranging two inclinometer tubes, thus improving measurement accuracy. By analyzing the spatial variation law of land deformation error, it eliminates abnormal data caused by instantaneous interference such as construction vibration or probe jamming, improving data reliability. Furthermore, by combining the unidirectional nature of lateral soil flow, it verifies the credibility of measured land deformation error from a time dimension, selecting high-quality data to provide more accurate input for subsequent parameter solving. Further, based on soil settlement characteristics, it constructs a comprehensive function of land deformation error changing over time. When solving the comprehensive function, it assigns weights to the measured land deformation error according to spatiotemporal availability, optimizing the parameter solving process and ensuring that high-quality data plays a dominant role in model fitting, improving the model's accuracy and robustness. Using the solved comprehensive function, it calculates the theoretical land deformation error at each measurement point in each time period, corrects the pile inclination angle, and obtains the true pile inclination angle. This eliminates the interference of soil deformation on the measurement results, improves the accuracy of pile inclination angle detection, and thus improves the accuracy of pile verticality detection results. Attached Figure Description

[0030] To more clearly illustrate the technical solutions and advantages in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 A flowchart illustrating the steps of a green building pile foundation verticality detection method provided in one embodiment of this application;

[0032] Figure 2 This is a schematic diagram showing the distribution of measurement points and guide rail grooves;

[0033] Figure 3 This is a schematic diagram illustrating the process of obtaining the actual tilt angle of the pile. Detailed Implementation

[0034] In the description of the embodiments in this application, the words "exemplary," "or," and "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design scheme described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design schemes. Specifically, the use of the words "exemplary," "or," and "for example" is intended to present the relevant concepts in a specific manner.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. It should be understood that, unless otherwise stated, " / " in this application means "or".

[0036] It should also be noted that the terms "first" and "second" in this application are used to distinguish similar objects, rather than to describe a specific order or sequence.

[0037] The following description, in conjunction with the accompanying drawings, details the specific scheme of the green building pile foundation verticality detection method, equipment, and system provided in this application.

[0038] Please see Figure 1 The diagram illustrates a flowchart of a method for detecting the verticality of green building pile foundations according to an embodiment of this application. The method includes the following steps:

[0039] Step 1: Embed two inclinometer tubes symmetrically inside the pile foundation to obtain the measured inclination angles of the measurement points at different depths at different time periods in the two inclinometer tubes.

[0040] Two inclinometer tubes are symmetrically embedded inside the green building pile foundation, and a special fixing bracket is used to tightly fix the inclinometer tubes to the inner wall of the pile body, ensuring that the guide rail groove of the inclinometer tube is parallel to the axis of the pile body. The tube sections are connected by socket joints and fixed with self-tapping screws, and sealant is applied to the joints. Each tube section is a segmented unit of the inclinometer tube; the distance between the inclinometer tube and the inner wall of the pile body is no more than 1.5m. A schematic diagram of the distribution of measurement points and guide rail grooves is shown below. Figure 2 As shown, the measurement points are arranged in ascending order according to their depth into the soil.

[0041] A portable digital pipe pile inclinometer was used, employing a dual-channel system to simultaneously acquire the measured inclination angles of each measurement point within two inclinometer tubes. The inclinometer probe was slowly lowered along the guide rail groove of the inclinometer tube at a speed controlled at 0.5 m / min, with measurements paused every 0.5 m to allow the readings to stabilize before recording the measured inclination angles in both tubes. The measured inclination angle of the measurement point in the inclinometer tube on either side was recorded as the measured inclination angle on side A, and the measured inclination angle of the measurement point in the inclinometer tube on the other side was recorded as the measured inclination angle on side B. Measured inclination angles were acquired on both sides of each measurement point within a single time period.

[0042] Step 2: Obtain the measured land deformation error at each measurement point in each time period; obtain the spatial availability and spatiotemporal availability of the measured land deformation error at each measurement point in each time period; construct a comprehensive function of land deformation error changing with time; obtain the true tilt angle of the pile at each measurement point in each time period.

[0043] Step 2.1: By analyzing the changes in the measured land deformation error at neighboring measurement points of each measurement point in each time period, the spatial availability of the measured land deformation error at each measurement point in each time period is obtained.

[0044] Since the measured inclination angles on both sides of each measuring point are the superposition of the true inclination angle of the pile and the soil deformation error, and the inclinometer tubes on both sides are affected by soil deformation in opposite directions, the pile inclination has the same effect on both sides. Therefore, under ideal conditions, taking the i-th measuring point as an example, the measured inclination angle of the i-th measuring point on side A can be decomposed as follows: The measured tilt angle of the i-th measurement point on side B can be decomposed into: ;in, , These represent the measured tilt angles of the i-th measurement point on side A and side B, respectively. This represents the true tilt angle of the i-th measurement point; Let represent the measured land deformation error at the i-th measurement point. After differentiating the measured tilt angles of the i-th measurement point on sides A and B, the actual tilt angles of the pile can cancel each other out, retaining only twice the soil deformation error. Therefore, the expression for the measured land deformation error at the i-th measurement point is: ;in, This represents the measured land deformation error at the i-th measurement point; This indicates the absolute value operation.

[0045] Because the measured inclination angle is affected by instantaneous interference such as construction vibration and probe jamming, the measured inclination angle is not entirely usable. Since the lateral constraint of soft soil foundations weakens with depth, the upper soil, after being compressed by load, tends to flow into deeper, weaker areas. This results in the deformation amplitude of the deep inclinometer tube being greater than that of the shallow layer. Therefore, the increasing soil deformation error with depth is an inherent characteristic of soft soil foundations.

[0046] Furthermore, soil deformation is caused by foundation consolidation and settlement, which is a slow and gradual process, and the soil deformation error will not show abrupt changes. If the fluctuation of the measured soil deformation error at the i-th measurement point is much larger than that at the (i-1)-th measurement point, it indicates that the data is affected by instantaneous interference such as construction vibration and probe jamming, and is therefore invalid data.

[0047] Based on the above analysis, by analyzing the changes in the measured land deformation error at the nearest neighboring measurement points of the i-th measurement point in each time period, the spatial availability of the measured land deformation error at the i-th measurement point in each time period is obtained. The specific process is as follows:

[0048] Calculate the difference in measured land deformation error between the i-th measurement point and the (i-1)-th measurement point in each time period, and compare it with the difference in measured land deformation error between the (i-1)-th measurement point and the (i-2)-th measurement point.

[0049] If the measured land deformation error at the i-th measurement point in each time period is greater than or equal to the measured land deformation error at the (i-1)-th measurement point, the spatial availability of the measured land deformation error at the i-th measurement point in each time period is inversely proportional to the deviation; otherwise, the spatial availability of the i-th measurement point in each time period is 0.

[0050] It should be noted that: difference refers to the degree of distinction between data, which can be achieved by calculating the absolute value of the difference, the square of the difference, the ratio, etc. This application does not impose any special restrictions.

[0051] In this embodiment, the expression for the spatial availability of the measured land deformation error at the i-th measurement point in each time period is:

[0052] In the formula, This represents the spatial availability at the i-th measurement point during the t-th time period; , , These represent the measured land deformation errors at the i-th, (i-1)-th, and (i-2)-th measurement points during the t-th time period, respectively. The absolute value operation is indicated by exp(); exp() represents an exponential function with the natural constant as the base, used to inversely map data to the interval (0,1]; Indicate the judgment condition: , Indicate the judgment condition: .in, The difference in measured land deformation error between the i-th measurement point and the (i-1)-th measurement point in the t-th time period; The difference in measured land deformation error between the (i-1)th and (i-2)th measurement points in the t-th time period; This represents the difference in measured land deformation error between the i-th and (i-1)-th measurement points in time period t, compared to the difference in measured land deformation error between the (i-1)-th and (i-2)-th measurement points. It should be noted that when t is 1, [the following is a partial translation of the original text, which is incomplete and requires further context]. Assign a value of 1; when i is 1 or 2, The value is assigned to 1.

[0053] It should be noted that: when the measured land deformation error increases with depth as the depth of the measurement point increases, it conforms to the law that the soil deformation error increases with depth; otherwise, it does not conform, and the measured land deformation error at the i-th measurement point is unusable. When the variation range of the measured land deformation error at adjacent measurement points is closer, it indicates that the soil deformation error is less likely to have a sudden change, the usability of the measured land deformation error at the i-th measurement point is higher, and the calculated spatial usability is greater.

[0054] Based on the method for calculating the spatial availability of the measured land deformation error at the i-th measurement point in each time period, the spatial availability of the measured land deformation error at each measurement point in each time period is calculated.

[0055] Step 2.2: By analyzing the spatial availability of land deformation errors at each measurement point in each time period and its neighboring time periods, and comparing the measured land deformation errors at each measurement point in each time period with those in its neighboring time periods, the spatiotemporal availability of the measured land deformation errors at each measurement point in each time period is obtained, which is used to assess the reliability of the measured land deformation errors.

[0056] Under load, the lateral flow of soft soil foundations exhibits a clear directionality, typically flowing towards the side with lower soil strength or weaker constraint. This unidirectionality results in the soil deformation developing in a generally consistent direction.

[0057] Taking the t-th time period as an example, based on the calculated spatial availability, if the measured land deformation error at the i-th measurement point in the t-th time period is greater than or equal to the measured land deformation error at the i-th measurement point in the (t-1)-th time period, it indicates that the direction of soil deformation development remains consistent, conforming to the deformation law of soft soil foundations. In this case, the spatiotemporal availability of the data is relatively high. Conversely, if the measured land deformation error at the i-th measurement point in the t-th time period is less than the measured land deformation error at the i-th measurement point in the (t-1)-th time period, it may be affected by construction disturbances, measurement errors, or other abnormal factors, leading to reduced data reliability and lower spatiotemporal availability.

[0058] Based on the above analysis, the spatial availability of the measured land deformation error at the i-th measurement point in the t-th time period and its neighboring time periods is obtained by comparing the measured land deformation error of the i-th measurement point in the t-th time period with that of its neighboring time periods. The specific process is as follows:

[0059] Calculate the sum of the spatial availability of the measured land deformation error at the i-th measurement point in the t-th and t-1-th time periods;

[0060] If the measured land deformation error of the i-th measurement point in the t-th time period is greater than or equal to the measured land deformation error of the i-th measurement point in the (t-1)-th time period, the product of the sum and 1 is taken as the confidence level of the measured land deformation error at the i-th measurement point in the t-th time period; otherwise, 0 is taken as the confidence level of the measured land deformation error at the i-th measurement point in the t-th time period.

[0061] The normalized value of the product of the confidence levels of the measured land deformation errors at the i-th measurement point in time period t and time period (t-1) is used as the spatiotemporal availability of the measured land deformation error at the i-th measurement point in time period t. It should be noted that when t is 1, the spatiotemporal availability of the measured land deformation error at the i-th measurement point in time period t is assigned a value of 1.

[0062] In this embodiment, the Min-Max normalization method is used to obtain the normalized value of the product of confidence levels. The Min-Max normalization method is a well-known technique and will not be described in detail here.

[0063] It should be noted that: when the measured land deformation error at the measurement point increases over time, it conforms to the deformation law of soft soil foundation; otherwise, it does not conform, and the measured land deformation error at the i-th measurement point is unusable. At the same time, the spatial availability of the measured land deformation error at the i-th measurement point in the nearest time period is combined with the spatial availability of the measured land deformation error at the i-th measurement point in the t-th time period. The larger the calculated spatial availability, the more reliable the measured land deformation error at the i-th measurement point in the t-th time period.

[0064] Based on the method for calculating the spatiotemporal availability of the measured land deformation error at the i-th measurement point in the t-th time period, the spatiotemporal availability of the measured land deformation error at each measurement point in each time period is calculated.

[0065] Step 2.3: Construct a comprehensive function of land deformation error over time based on the settlement characteristics of the soil where the pile foundation is located, where there are unknown parameters; when solving the comprehensive function, the spatiotemporal availability is used to assign importance to the measured land deformation error.

[0066] In soft soil foundations, the inclination angle measurement of ultra-long piles is affected by soil deformation, and this effect exhibits a specific pattern over time: In the initial stage, soil deformation develops rapidly, and the inclinometer tube experiences significant compression from the soil, leading to a rapid increase in the inclination angle measurement error—that is, a rapid increase in soil deformation error. In the middle stage, the rate of soil deformation gradually slows down, and the interaction between the inclinometer tube and the soil gradually becomes more coordinated. At this point, the growth rate of the inclination angle measurement error decreases significantly, but still maintains a certain upward trend. In the later stage, soil deformation basically stabilizes, and the inclinometer tube and soil reach a relative equilibrium. The inclination angle measurement error also gradually stabilizes, with only minor variations possible. This variation can be expressed by the expression... It means that, among them, , , , All are unknown parameters; e represents the natural constant; t represents the time period number.

[0067] Because the lateral deformation of soft soil foundations is spatially consistent, although the degree of soil deformation varies at different measurement points, the development patterns are similar. Soil is a continuous medium, and measurement points at different depths are controlled by the same soil parameters and load conditions, resulting in similar deformation processes. To describe the change of land deformation error over time at all measurement points on the green building pile foundation, a proportionality coefficient is introduced. It is important to note that the proportionality coefficients at different measurement points are not linearly related; that is, the proportionality coefficients do not exhibit linear changes. Therefore, a comprehensive function encompassing the change of land deformation error over time at all measurement points can be constructed, expressed as:

[0068] In the formula, , , These represent the estimated values ​​of land deformation error at the 1st, 2nd, and Nth measurement points in the t-th time period, respectively; t represents the sequence number of the time period. , , , , , All are unknown parameters; e represents the natural constant.

[0069] It should be noted that in the initial stage of verticality testing, when there are fewer than 5 time periods, the historical data is insufficient to fit the model parameters. Therefore, the average value of the measured tilt angles of each measurement point on both sides is directly used as the true tilt angle of the pile body without model correction.

[0070] Because data quality varies across different measurement points at different historical time periods, data with higher spatiotemporal availability is less susceptible to interference and can more accurately reflect soil deformation patterns. Therefore, it is necessary to assign greater weight to highly available data, allowing it to play a dominant role in the parameter solution process. This effectively suppresses the influence of outlier data on parameter estimation and improves the accuracy and robustness of the model. Therefore, the objective function for constructing the comprehensive function is expressed as:

[0071] In the formula, J represents the weighted sum of the squared differences between the measured land deformation error and the estimated land deformation error of the comprehensive function; This represents the spatiotemporal availability of the measured land deformation error at the i-th measurement point during the t-th time period; This represents the measured land deformation error at the i-th measurement point during the t-th time period; This represents the estimated value of the land deformation error at the i-th measurement point during the t-th time period.

[0072] Furthermore, by minimizing the objective function, the solution is obtained. , , , , , These unknown parameters yield a comprehensive function of how land deformation error changes over time.

[0073] Step 2.4: Obtain the theoretical land deformation error at each measurement point under each time period by solving the comprehensive function, and combine the measured tilt angle with the measured land deformation error to obtain the actual tilt angle of the pile body at each measurement point under each time period.

[0074] The comprehensive function is a mathematical model obtained by fitting high-availability data over multiple time periods. It accurately describes the evolution of land deformation error over time, and its core parameters reflect the inherent characteristics of consolidation and settlement of soft soil foundations. The functions of land deformation error changing with time at different measurement points differ only in the proportional coefficient, while the decay law remains consistent.

[0075] The theoretical land deformation error at each measurement point in each time period is obtained by solving the comprehensive function.

[0076] Ideally, the measured inclination angle of the pile at each measuring point is equal to the true inclination angle of the pile. The expression for the measured inclination angle of the pile at each measuring point is: In the formula, This represents the measured inclination angle of the pile at the i-th measurement point; , Let A and B represent the measured tilt angles of the i-th measurement point on side A and side B, respectively. However, the collected data can be affected by factors such as signal interference, leading to inaccurate calculations of the pile tilt angles. Therefore, the measured tilt angles of the pile at each measurement point in each time period are corrected by the difference between the measured land deformation error and the theoretical land deformation error, resulting in the true tilt angle of the pile at each measurement point in each time period. The expression is as follows:

[0077] In the formula, This represents the actual tilt angle of the pile at the i-th measurement point during the t-th time period; This represents the measured tilt angle of the pile at the i-th measurement point during the t-th time period; This represents the measured land deformation error at the i-th measurement point during the t-th time period; This represents the theoretical land deformation error at the i-th measurement point during the t-th time period. A schematic diagram illustrating the process of obtaining the true tilt angle of the pile is shown below. Figure 3 As shown.

[0078] Calculate the true inclination angle of the pile at each measurement point in each time period according to the calculation method of the true inclination angle of the pile at the i-th measurement point in the t-th time period.

[0079] Step 3: Obtain the true verticality of the pile foundation at each time period by measuring the actual tilt angle of the pile at all measurement points.

[0080] Portable digital inclinometers measure the inclination angle of the pile at each measurement point, not its horizontal displacement. Since the pile is a continuous body, the horizontal displacement at each measurement point is the cumulative displacement caused by the inclination angles from that point to the top of the pile. Therefore, converting the inclination angles at each measurement point into horizontal displacements and then accumulating them along the depth direction yields the actual horizontal displacement of each measurement point relative to the top of the pile. Since pile verticality is defined as the ratio of the maximum horizontal displacement of the pile to the pile length, usually expressed as a percentage, the pile verticality for each time period can be obtained by accumulating the horizontal displacement at the pile bottom to the pile length over different time periods. The expression is:

[0081] In the formula, The value of L represents the verticality of the pile foundation during the 0th time period; L represents the standard pitch of the probe, which is the distance between any two adjacent measurement points. In this embodiment, the value of L is 0.5m. Let represent the true inclination angle of the pile at the ith measurement point during the ith time period; sin() represents the sine function; H represents the net horizontal displacement increment between the i-th and (i-1)-th measurement points during the o-th time period; H represents the pile length of the pile foundation, i.e., the distance from the top of the pile to the bottom of the pile.

[0082] Based on the same inventive concept as the above method, this application also provides a green building pile foundation verticality detection device, including:

[0083] The tilt angle acquisition module is used to symmetrically pre-embed two inclinometer tubes inside the pile foundation to obtain the measured tilt angle of the measurement points at different depths in the two inclinometer tubes at different time periods, and then obtain the measured land deformation error at each measurement point at different time periods.

[0084] The tilt angle correction module is used to analyze the changes in measured land deformation error at neighboring measurement points of each measurement point in different time periods, obtain the spatial availability of the measured land deformation error at each measurement point in different time periods, and then compare the measured land deformation error of each measurement point with that of its neighboring time periods to obtain the spatiotemporal availability of the measured land deformation error at each measurement point in different time periods, which is used to evaluate the reliability of the measured land deformation error. Based on the settlement characteristics of the soil where the pile foundation is located, a comprehensive function of land deformation error changing with time is constructed, in which there are unknown parameters. When solving the comprehensive function, the spatiotemporal availability is used to assign importance to the measured land deformation error. The theoretical land deformation error at each measurement point in different time periods is obtained through the solved comprehensive function, and combined with the measured tilt angle and the measured land deformation error, the true tilt angle of the pile body at each measurement point in different time periods is obtained.

[0085] The verticality detection module is used to obtain the true verticality of the pile foundation at different time periods.

[0086] Based on the same inventive concept as the above methods, this application also provides a green building pile foundation verticality detection system, including a memory, a processor, and a computer program stored in the memory and running on the processor. When the processor executes the computer program, it implements the steps of any one of the above-described green building pile foundation verticality detection methods.

[0087] In summary, this application effectively eliminates common-mode errors caused by external interference such as construction vibration and probe jamming by symmetrically arranging two inclinometer tubes, thus improving measurement accuracy. By analyzing the spatial variation law of land deformation error, it eliminates abnormal data caused by instantaneous interference such as construction vibration or probe jamming, improving data reliability. Furthermore, by combining the unidirectional nature of lateral soil flow, it verifies the credibility of measured land deformation error from a time dimension, selecting high-quality data to provide more accurate input for subsequent parameter solving. Further, based on soil settlement characteristics, a comprehensive function of land deformation error changing over time is constructed. When solving the comprehensive function, the measured land deformation error is weighted according to spatiotemporal availability, optimizing the parameter solving process and ensuring that high-quality data plays a dominant role in model fitting, improving the model's accuracy and robustness. Using the solved comprehensive function, the theoretical land deformation error at each measurement point in each time period is calculated, correcting the pile inclination angle to obtain the true pile inclination angle. This eliminates the interference of soil deformation on the measurement results, improves the accuracy of pile inclination angle detection, and thus improves the accuracy of pile verticality detection results.

[0088] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than that shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks may also occur in a different order than disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. Each block in a block diagram and / or flowchart, and combinations of blocks in a block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0089] It will be apparent to those skilled in the art that this application is not limited to the details of the exemplary embodiments described above, and that this application can be implemented in other specific forms without departing from its essential characteristics. Therefore, the embodiments described above should be considered exemplary and non-limiting in all respects.

Claims

1. A green building pile foundation verticality detection method, characterized in that, The method includes the following steps: Two inclinometer tubes are symmetrically embedded inside the pile foundation to obtain the measured inclination angle of the measurement points at different depths in the two inclinometer tubes at different time periods, and then obtain the measured land deformation error at each measurement point at different time periods. By analyzing the changes in measured land deformation errors at neighboring measurement points during different time periods, the spatial availability of measured land deformation errors at each measurement point during each time period is obtained. Then, the measured land deformation errors at each measurement point during each time period are compared with those of its neighboring time periods to obtain the spatiotemporal availability of measured land deformation errors at each measurement point during each time period, which is used to assess the reliability of the measured land deformation errors. Based on the settlement characteristics of the soil where the pile foundation is located, a comprehensive function of land deformation error changing with time is constructed, in which unknown parameters exist. When solving the comprehensive function, the spatiotemporal availability is used to assign importance to the measured land deformation errors. The theoretical land deformation errors at each measurement point during each time period are obtained through the solved comprehensive function. Combined with the measured tilt angle and the measured land deformation errors, the true tilt angle of the pile body at each measurement point during each time period is obtained, and thus the true verticality of the pile foundation during each time period is obtained. The process of obtaining the space availability is as follows: Calculate the difference in measured land deformation error between each measurement point and its predecessor in each time period, and the deviation amount compared with the difference in measured land deformation error between the previous measurement point and its predecessor. When the measured land deformation error at each measurement point in each time period is greater than or equal to the measured land deformation error at the previous measurement point, the spatial availability is inversely proportional to the deviation; otherwise, the spatial availability is 0. The process of obtaining the spatiotemporal availability is as follows: Calculate the sum of the spatial availability of the measured land deformation error at each measurement point in each time period and the previous time period; If the measured land deformation error of each measurement point in each time period is greater than or equal to the measured land deformation error of each measurement point in the previous time period, the product of the sum and 1 is taken as the confidence level of the measured land deformation error at each measurement point in each time period; otherwise, 0 is taken as the confidence level of the measured land deformation error at each measurement point in each time period. The spatiotemporal availability is obtained by comprehensively considering the reliability of the measured land deformation error of each measurement point in each time period and its neighboring time periods; The spatiotemporal availability is the product of the reliability of the measured land deformation error of each measurement point in each time period and the previous time period. Assigning importance to the measured land deformation error through the spatiotemporal availability includes: The objective function of the comprehensive function is the weighted sum of the squared differences between the measured land deformation error and the estimated land deformation error of the comprehensive function, wherein the weight of the squared difference is the spatiotemporal availability of the corresponding measured land deformation error.

2. The method for detecting the verticality of a green building pile foundation according to claim 1, wherein, The measured land deformation error is the average difference between the measured tilt angles of each measurement point in the two inclinometer tubes at each time period.

3. The method for detecting the verticality of green building pile foundations as described in claim 1, characterized in that, The process for obtaining the actual tilt angle of the pile body is as follows: Calculate the average value of the measured tilt angles of each measurement point in the two inclinometer tubes at each time period; Calculate the difference between the measured land deformation error and the theoretical land deformation error at each measurement point during each time period; use the difference to correct the average value to obtain the true tilt angle of the pile.

4. The method for detecting the verticality of green building pile foundations as described in claim 3, characterized in that, The actual tilt angle of the pile is the sum of the average value and the difference.

5. A green building pile foundation verticality testing device, employing the green building pile foundation verticality testing method as described in claim 1, characterized in that, The device includes: The tilt angle acquisition module is used to symmetrically pre-embed two inclinometer tubes inside the pile foundation to obtain the measured tilt angle of the measurement points at different depths in the two inclinometer tubes at different time periods, and then obtain the measured land deformation error at each measurement point at different time periods. The tilt angle correction module is used to analyze the changes in measured land deformation error at neighboring measurement points of each measurement point in different time periods, obtain the spatial availability of the measured land deformation error at each measurement point in different time periods, and then compare the measured land deformation error of each measurement point with that of its neighboring time periods to obtain the spatiotemporal availability of the measured land deformation error at each measurement point in different time periods, which is used to evaluate the reliability of the measured land deformation error. Based on the settlement characteristics of the soil where the pile foundation is located, a comprehensive function of land deformation error changing with time is constructed, in which there are unknown parameters. When solving the comprehensive function, the spatiotemporal availability is used to assign importance to the measured land deformation error. The theoretical land deformation error at each measurement point in different time periods is obtained through the solved comprehensive function, and combined with the measured tilt angle and the measured land deformation error, the true tilt angle of the pile body at each measurement point in different time periods is obtained. The verticality detection module is used to obtain the true verticality of the pile foundation at different time periods.

6. A green building pile foundation verticality detection system, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the green building pile foundation verticality detection method as described in any one of claims 1-4.

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