Intelligent sensing system and method for prefabricated pipe pile connection node mechanism character

Abstract

The invention discloses a prefabricated pipe pile connection node mechanism character intelligent sensing system and method, and relates to the field of engineering monitoring, the prefabricated pipe pile connection node mechanism character intelligent sensing system comprises the following steps: an intelligent sensing module is used for embedding an intelligent sensing sensor at a corresponding position of a pile body, and the sensor is used for accurately sensing the strain and the inclination angle of a connection node; the data acquisition module is used for acquiring data from a sensor, and the data acquisition module adopts a high-precision data acquisition card and transmits the data to the data analysis and processing module through a built-in data transmission protocol; the analysis and processing module is used for carrying out filtering processing on the collected data, calculating the axial force, the bending moment and the inclination angle at a connecting node through a built-in algorithm, comparing the axial force, the bending moment and the inclination angle with preset parameter values, and carrying out stability checking calculation and prejudging the condition of a pile body; and the feedback and early warning module is used for generating a real-time feedback signal according to a calculation result of the processing and analysis module, displaying the real-time feedback signal to construction personnel through mobile equipment, and giving an alarm according to a preset safety threshold.

Description

Technical Field

[0001] The present invention relates to the field of civil engineering, in particular to an intelligent monitoring technology for prefabricated pipe pile connection nodes, and specifically to an intelligent sensing system and method for mechanical properties of prefabricated pipe pile connection nodes. Background Art

[0002] Precast pipe piles are a highly efficient and economical form of pile foundation with the advantages of energy saving, environmental protection, capital saving and fast construction. They are a commonly used foundation form in modern civil engineering. Their construction quality and long-term stability are directly related to the safety of the entire project. With the acceleration of urbanization, pile foundations are widely used in construction projects such as housing, bridges, foundation pits, ports and docks, water conservancy projects, highways, railways, tunnels, earthquake prevention and disaster reduction. At the same time, the continuous innovation and development of precast pipe pile technology is of great significance to ensuring project quality and improving construction efficiency.

[0003] Deficiencies of existing technologies: In the actual construction process, the connection nodes of prefabricated pipe piles often become weak links. Their stress state and posture changes are difficult to monitor in real time, which brings challenges to construction quality control. Traditional monitoring methods rely on manual detection and experience judgment, which is not only inefficient, but also difficult to ensure the accuracy and real-time nature of the data. With the vigorous promotion of prefabricated bridges and the continuous advancement of large-span bridge construction technology, high-strength prefabricated pipe piles have begun to show obvious advantages in soft soil and coastal areas, and are developing in the direction of ultra-long and large diameter. As the length and diameter of the pile foundation increase, the impact force of the pile hammer increases, and the difficulty of driving will increase. Large-diameter high-strength prefabricated pipe piles are prone to various problems such as pile body fracture, pile top crushing, low bearing capacity, floating, tilting, and displacement during the driving process, which not only cause engineering quality accidents, but also lead to the pile rate being out of control.

[0004] In view of the above problems, the present invention proposes a solution. Summary of the invention

[0005] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides a system and method for intelligently sensing the properties of the connection node mechanism of prefabricated pipe piles, by burying sensors at corresponding positions of the pile body in advance, intelligently sensing, and accurately collecting and processing the sensed data and then outputting a feedback signal, so as to effectively improve the construction progress and benefits of the project while ensuring the quality of the project.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a system for intelligently sensing the mechanical properties of connection nodes of prefabricated pipe piles, comprising the following steps: an intelligent sensing module, used to bury intelligent sensing sensors at corresponding positions of the pile body, the sensors being used to accurately sense the strain and inclination angle of the connection nodes; a data acquisition module, used to collect data from the sensors, the data acquisition module using a high-precision data acquisition card, and transmitting the data to a data processing and analysis module through a built-in data transmission protocol; a processing and analysis module, used to filter the collected data, calculate the axial force, bending moment and inclination angle at the connection node through a built-in algorithm, compare them with preset parameter values, perform stability verification and predict the pile body condition; a feedback and early warning module, used to generate a real-time feedback signal based on the calculation results of the processing and analysis module, and display it to construction personnel through a mobile device, and issue an alarm based on a preset safety threshold. In a preferred embodiment, the sensor installation method of the intelligent sensing module is as follows: the intelligent sensing module includes upper and lower end plates fixedly connected to the upper and lower ends of the outer circular ring plate, and the inner circular ring plate is coaxially installed inside the outer circular ring plate; the upper and lower connecting pipes are respectively fixedly inserted in the upper mounting hole of the upper end plate and the lower mounting hole of the lower end plate, and the four strain and inclination sensors are evenly distributed on the inner surface of the outer circular ring plate.

[0007] In a preferred embodiment, the sensor sensing process is as follows: it is used to accurately sense the strain change and tilt angle at the connection node and provide basic data for the data acquisition module.

[0008] In a preferred embodiment, the implementation process of the analysis and processing module is as follows: it is used to analyze the collected data, and perform filtering and outlier elimination processing; calculate the axial force, bending moment and inclination angle at the connection node of the prefabricated pipe pile through a built-in algorithm, compare them with the preset parameter values, and verify the overall stability of the foundation pit; predict the condition of the pile body according to the stability verification results, and detect the location of pile body defects and the integrity of the pile body.

[0009] In a preferred embodiment, the steps of verifying the overall stability of the foundation pit are as follows: a triaxial test is performed on the soil around the foundation pit to obtain the shear strength of the soil, that is, the lateral moment resistance; according to the project construction drawings, the location of the foundation pit is obtained, and the effective depth of the soil is confirmed. The effective depth of the soil is the middle depth of the soil around the foundation pit, that is, the effective resistance depth of the soil; a single pile static load test is performed to apply loads to the pipe piles to be tested step by step, and the bearing capacity of the pipe piles when cracks and bends appear is recorded to obtain the single pile bearing capacity of the prefabricated pipe piles; the pile foundation penetration depth is measured until it contacts a soil layer with sufficient bearing capacity, and the pile foundation penetration depth at this time is recorded, that is, the effective bearing depth of the pipe pile; the soil layer with sufficient bearing capacity is at The soil layer that does not sink when the preset maximum bearing capacity is applied to the pipe piles; the lateral resistance of the soil, the effective resistance action depth of the soil, the single pile bearing capacity of the prefabricated pipe piles and the effective bearing depth of the pipe piles are input into the preset lateral resistance moment formula for output to obtain the lateral resistance moment; the external load of the prefabricated pipe piles and the height of the center of gravity of the building above the foundation pit are obtained. If the load is distributed, the height of the combined force of the load is calculated by integration to obtain the load action height; the driving torque is obtained by multiplying the external load and the load action height; the lateral resistance moment is divided by the driving torque to obtain an overall stability value of the foundation pit; the accuracy of the overall stability value of the foundation pit is further improved by the changes in resistance and driving force caused by sensor feedback data.

[0010] A method for intelligently sensing the mechanical properties of a prefabricated pipe pile connection node comprises the following steps: burying an intelligent sensing sensor at a corresponding position of a pile body, the sensor being used to accurately sense the strain and tilt angle of a connection node; collecting data from the sensor, the data acquisition module using a high-precision data acquisition card, and transmitting the data to a data processing and analysis module through a built-in data transmission protocol; filtering the collected data, calculating the axial force, bending moment and tilt angle at the connection node through a built-in algorithm, comparing the calculated data with preset parameter values, performing stability verification and predicting the pile body condition; generating a real-time feedback signal based on the calculation result of the processing and analysis module, displaying the signal to construction personnel through a mobile device, and giving an alarm based on a preset safety threshold.

[0011] The technical effects and advantages of the intelligent perception system and method of the properties of the prefabricated pipe pile connection node mechanism of the present invention are as follows: 1. The present invention buries intelligent sensing joints at corresponding positions of the pile body in advance, and during the static load detection of the foundation pile, simultaneously performs stress tests at corresponding positions, understands the force distribution within the pile body, and calculates the pile-soil interaction, and collects data in real time; uploads the collected data to the data processing module, and calculates the axial force, bending moment and inclination angle at the connection node of the prefabricated pipe pile through a built-in algorithm, so as to predict the pile body condition in advance, whether there will be problems such as pile body breakage, pile top crushing, low bearing capacity, floating, inclination, and deviation, and can provide real-time feedback to guide the construction process to ensure construction quality and safety.

[0012] 2. The present invention improves the accuracy and reliability of monitoring data by using a high-precision data acquisition card and a built-in algorithm for data processing and analysis. At the same time, data quality is further improved through data filtering and outlier elimination. The calculation results of the data processing module are then used to generate a real-time feedback signal, which is displayed to construction personnel through a display screen or a mobile device. At the same time, early warnings and alarms are performed according to preset safety thresholds, in order to repair pile foundations with insufficient integrity such as possible pile body fractures and pile top crushing, or to repair the damaged positions of defective pipe piles, so that they can reach the required bearing capacity, thereby enabling construction personnel to adjust the construction plan and optimize construction parameters in a timely manner, improve construction efficiency and reduce the risk of safety accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The present invention is a schematic diagram of the structure of a prefabricated pipe pile connection node mechanism property intelligent perception system.

[0014] Figure 2 Schematic diagram of a method for intelligently sensing the properties of a prefabricated pipe pile connection node mechanism according to the present invention DETAILED DESCRIPTION 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.

[0015] Embodiment 1, Figure 1 The present invention provides a prefabricated pipe pile connection node mechanism property intelligent perception system, comprising the following steps: S10, intelligent sensing module, is used to bury intelligent sensing sensors at corresponding positions of the pile body, and the sensors are used to accurately sense the strain and tilt angle of the connection node.

[0016] The joint is made of high-strength steel to ensure that it can maintain stable performance when subjected to large axial forces and bending moments; Install the smart sensing joint between the two pile sections distributed above and below, ensuring that the joint is installed at the correct position and angle; During the installation process, be careful to protect the strain / tilt sensor from damage and ensure that the connection between it and the data acquisition module is stable and reliable.

[0017] During this process, the foundation pit stability can be checked first to determine whether it meets the specification requirements.

[0018] The steps of the overall stability verification of the foundation pit are as follows: The triaxial test is carried out on the soil around the foundation pit to obtain the shear strength of the soil, that is, the resistance to lateral moment; According to the project construction drawings, obtain the location of the foundation pit and confirm the effective depth of the soil. The effective depth of the soil is the middle depth of the soil around the foundation pit, that is, the effective resistance depth of the soil; Through the single pile static load test, the load is gradually increased on the tested pipe pile, and the bearing capacity when cracks and bending occur in the pipe pile is recorded to obtain the single pile bearing capacity of the prefabricated pipe pile; The penetration depth of the pile foundation is recorded until it contacts the soil layer with sufficient bearing capacity, which is the effective bearing depth of the pile foundation. The soil layer with sufficient bearing capacity is the soil layer that does not sink when the pipe pile is applied with a preset maximum bearing capacity; The lateral resistance of the soil, the effective resistance depth of the soil, the single pile bearing capacity of the prefabricated pipe pile and the effective bearing depth of the pipe pile are input into a preset lateral resistance moment formula for output to obtain the lateral resistance moment; Obtain the external load of the prefabricated pipe piles and the height of the center of gravity of the building above the foundation pit. If the load is distributed, calculate the load's combined action height by integration to obtain the load's action height. The driving torque is obtained by multiplying the external load and the height at which the load acts; Dividing the anti-lateral moment by the driving moment, a foundation pit overall stability value is obtained; The accuracy of the overall stability value of the foundation pit is further improved by the changes in the resistance and driving force caused by the sensor feedback data.

[0019] The formula for checking the overall stability of the foundation pit is as follows:

[0020] The formula to further improve the accuracy of the overall stability of the foundation pit is as follows:

[0021] In the formula, is the foundation pit stability coefficient, is the lateral moment, is the driving torque, is the lateral resistance of the soil, is the effective resistance depth of the soil. is the single pile bearing capacity of precast pipe piles. is the effective bearing depth of the pile. is the external load, is the height at which the load acts, Indicates the resistance change caused by the sensor feedback data, Indicates the change in driving force caused by sensor feedback data.

[0022] It should be noted that once the foundation pit stability coefficient is obtained, a safety factor is usually specified according to the design specifications to ensure the stability of the foundation pit. If the foundation pit stability coefficient is greater than the safety factor, the foundation pit is considered stable and meets the requirements of the specifications.

[0023] When carrying out piling construction, the pile driver must first be inspected to ensure that it meets the piling requirements; During the static load test of the foundation piles, stress tests are carried out simultaneously at the corresponding positions to understand the force distribution within the pile body and to estimate the pile-soil interaction.

[0024] S20, a data acquisition module is used to collect data from the sensor. The data acquisition module uses a high-precision data acquisition card and transmits the data to the data analysis and processing module through a built-in data transmission protocol.

[0025] Start the data acquisition module to collect data in real time. The data acquisition module uses a high-precision data acquisition card to ensure that the collected data is accurate and improve the accuracy and reliability of the monitoring data; At the same time, the data is transmitted to the data processing module for processing and analysis through the built-in data transmission protocol.

[0026] S30, analysis and processing module, is used to filter the collected data, calculate the axial force, bending moment and inclination angle at the connection node through the built-in algorithm, compare them with the preset parameter values, perform stability verification and predict the pile body condition.

[0027] After receiving the data, the data processing module first performs filtering and outlier removal to improve data quality; The collected data is uploaded to the data processing module, and the axial force, bending moment, tilt angle and other parameter values ​​at the connection nodes of the prefabricated pipe piles are calculated through the built-in algorithm to predict the pile body conditions in advance, such as whether there will be pile body fracture, pile top crushing, low bearing capacity, floating, tilt, deviation and other problems; The integrity of the pile foundation is determined by the high strain method. The high strain method is a dynamic detection method that stimulates the resistance of the soil around the pile and the bearing force of the pile end. Under the impact load of the high strain method, the pile-soil system enters a fully inelastic working stage, and instantaneous shear failure occurs between the pile and the soil around the pile, thereby fully stimulating the full resistance of the soil around the pile to the pile; By collecting the time history curve of the axial strain and pile movement of the pile section under the impact load, the axial internal force F(t) and axial movement velocity v(t) of the section are obtained, so as to observe the propagation process of the stress wave in the pile body; The system high strain integrity detection analysis such as CASE method can determine the pile foundation integrity coefficient β. The specific formula of the predicted pile body integrity coefficient is as follows:

[0028] Where: β is the pile integrity coefficient; K is the anti-overturning coefficient; t1 is the time corresponding to the first velocity peak; F(t1) is the hammer force at the moment; V(t1) is the particle motion velocity at the moment t1; Z is the mechanical impedance of the pile section; t X is the time corresponding to the defect reflection peak; x is the distance from the pile defect to the sensor installation point; R x The estimated value of the soil resistance above the defect is equal to the difference between the force and velocity at the starting point of the defect reflection wave multiplied by the mechanical impedance of the pile section; The specific determination formula for determining the position of pile body defects is as follows:

[0029] Where x is the distance from the pile defect to the sensor installation point, t1 is the time corresponding to the first velocity peak; t X is the time corresponding to the defect reflection peak; c is the defect coefficient; K is the anti-overturning coefficient.

[0030] S40, a feedback and early warning module, is used to generate a real-time feedback signal according to the calculation results of the processing and analysis module, and display it to the construction personnel through a mobile device, and issue an alarm according to a preset safety threshold.

[0031] The method for obtaining the real-time feedback and early warning is as follows: According to the size of the pile body integrity coefficient and the distance from the pile body defect to the sensor installation point, the pile body integrity category is divided into four categories: Category I: β = 1.0, x = 0; Category II: 0.8 ≤ β < 1.0, 0 ≤ x < 0.2; Category III: 0.6 ≤ β < 0.8, 0.2 ≤ x < 0.4; Category IV: β < 0.6, x > 0.4; When the pile body integrity category does not belong to Class III and Class IV, it exceeds the safety threshold and there are problems of pile body fracture and pile top crushing. Early warning and alarm are required, and the construction plan should be adjusted and the construction parameters should be optimized to ensure that the stress state and posture changes of the prefabricated pipe pile connection nodes are within a safe and controllable range.

[0032] The construction personnel timely adjusted the construction plan and optimized the construction parameters according to the real-time feedback results to ensure that the stress state and posture changes of the prefabricated pipe pile connection nodes are within a safe and controllable range; For example, when the axial force or bending moment detected exceeds the preset threshold, reinforcement measures are taken in time to prevent the connection node from being damaged; When the tilt angle is detected to be too large, the pile position should be adjusted in time or the supporting structure should be added to ensure that the verticality of the pile meets the requirements; When piles with insufficient integrity such as broken pile bodies and broken pile tops are detected, piles can be added in time or the damaged parts of defective pipe piles can be repaired to achieve the required bearing capacity; This enables construction personnel to adjust construction plans and optimize construction parameters in a timely manner, thereby improving construction efficiency and reducing the risk of safety accidents.

[0033] Embodiment 2, Figure 2 The present invention provides a method for intelligently sensing the properties of a prefabricated pipe pile connection node mechanism, comprising the following steps: A method for intelligently sensing the mechanical properties of a prefabricated pipe pile connection node comprises the following steps: burying an intelligent sensing sensor at a corresponding position of a pile body, the sensor being used to accurately sense the strain and tilt angle of a connection node; collecting data from the sensor, the data acquisition module using a high-precision data acquisition card, and transmitting the data to a data processing and analysis module through a built-in data transmission protocol; filtering the collected data, calculating the axial force, bending moment and tilt angle at the connection node through a built-in algorithm, comparing the calculated data with preset parameter values, performing stability verification and predicting the pile body condition; generating a real-time feedback signal based on the calculation result of the processing and analysis module, displaying the signal to construction personnel through a mobile device, and giving an alarm based on a preset safety threshold.

[0034] The above formulas are all dimensionless and numerical calculations. The formula is a formula for the most recent real situation obtained by collecting a large amount of data and performing software simulation. The preset parameters in the formula are set by technicians in this field according to actual conditions.

[0035] The above embodiments may be implemented in whole or in part by software, hardware, firmware or any other combination. When implemented by software, the above embodiments may be implemented in whole or in part in the form of a computer program product.

[0036] Those of ordinary skill in the art will appreciate that the modules and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0037] In addition, each functional module in each embodiment of the present application may be integrated into one processing module, or each module may exist physically separately, or two or more modules may be integrated into one module.

[0038] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0039] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An intelligent perception system for the properties of prefabricated pipe pile connection nodes, characterized in that: The following steps are involved: An intelligent sensing module is used to bury intelligent sensing sensors at corresponding positions of the pile body, and the sensors are used to accurately sense the strain and tilt angle of the connection node; A data acquisition module is used to collect data from the sensor. The data acquisition module uses a high-precision data acquisition card and transmits the data to the data processing and analysis module through a built-in data transmission protocol; The processing and analysis module is used to filter the collected data, calculate the axial force, bending moment and inclination angle at the connection node through the built-in algorithm, compare them with the preset parameter values, perform stability verification and predict the pile body condition; The feedback and early warning module is used to generate real-time feedback signals based on the calculation results of the processing and analysis module, display them to construction personnel through mobile devices, and issue alarms based on preset safety thresholds.

2. According to claim 1, the intelligent perception system for the properties of prefabricated pipe pile connection nodes is characterized in that: The sensor installation method of the intelligent sensing module is as follows: The intelligent sensing module comprises an upper and a lower end plate fixedly connected to the upper and lower ends of the outer circular ring plate, and the inner circular ring plate is coaxially installed inside the outer circular ring plate; The upper and lower connecting inserts are fixedly inserted in the upper mounting hole of the upper end plate and the lower mounting hole of the lower end plate respectively, and the four strain and inclination sensors are evenly distributed on the inner surface of the outer annular plate in an annular direction.

3. The intelligent perception system for properties of prefabricated pipe pile connection nodes according to claim 2 is characterized in that: The sensor perception process is as follows: It is used to accurately sense the strain changes and tilt angles at the connection nodes and provide basic data for the data acquisition module.

4. The intelligent perception system for properties of prefabricated pipe pile connection nodes according to claim 3 is characterized in that: The implementation process of the analysis and processing module is as follows: Used to analyze the collected data and perform filtering and outlier removal processing; The built-in algorithm is used to calculate the axial force, bending moment and inclination angle at the connection nodes of the precast piles, and compared with the preset parameter values ​​to verify the overall stability of the foundation pit; Predict the condition of the pile body based on the stability verification results, and detect the location of pile body defects and the integrity of the pile body.

5. The intelligent perception system for properties of prefabricated pipe pile connection nodes according to claim 4 is characterized in that: The steps of the overall stability verification of the foundation pit are as follows: The triaxial test is carried out on the soil around the foundation pit to obtain the shear strength of the soil, that is, the resistance to lateral moment; According to the project construction drawings, obtain the location of the foundation pit and confirm the effective depth of the soil. The effective depth of the soil is the middle depth of the soil around the foundation pit, that is, the effective resistance depth of the soil; Through the single pile static load test, the load is gradually increased on the tested pipe pile, and the bearing capacity when cracks and bending occur in the pipe pile is recorded to obtain the single pile bearing capacity of the prefabricated pipe pile; The penetration depth of the pile foundation is recorded until it contacts the soil layer with sufficient bearing capacity, which is the effective bearing depth of the pile foundation. The soil layer with sufficient bearing capacity is the soil layer that does not sink when the pipe pile is applied with a preset maximum bearing capacity; The lateral resistance of the soil, the effective resistance depth of the soil, the single pile bearing capacity of the prefabricated pipe pile and the effective bearing depth of the pipe pile are input into a preset lateral resistance moment formula for output to obtain the lateral resistance moment; Obtain the external load of the prefabricated pipe piles and the height of the center of gravity of the building above the foundation pit. If the load is distributed, calculate the load's combined action height by integration to obtain the load's action height. The driving torque is obtained by multiplying the external load and the height at which the load acts; Dividing the anti-lateral moment by the driving moment, a foundation pit overall stability value is obtained; The accuracy of the overall stability value of the foundation pit is further improved by the changes in the resistance and driving force caused by the sensor feedback data.

6. The intelligent perception system for properties of prefabricated pipe pile connection nodes according to claim 5 is characterized in that: The formula for checking the overall stability of the foundation pit is as follows: The formula to further improve the accuracy of the overall stability of the foundation pit is as follows: In the formula, is the foundation pit stability coefficient, is the lateral moment, is the driving torque, is the lateral resistance of the soil, is the effective resistance depth of the soil. is the single pile bearing capacity of precast pipe piles. is the effective bearing depth of the pile. is the external load, is the height at which the load acts, Indicates the resistance change caused by the sensor feedback data, Indicates the change in driving force caused by sensor feedback data.

7. The intelligent perception system for properties of prefabricated pipe pile connection nodes according to claim 5 is characterized in that: The specific formula for predicting pile body integrity is as follows: Where: β is the pile integrity coefficient; K is the anti-overturning coefficient; t1 is the time corresponding to the first velocity peak; F(t1) is the hammer force at the moment; V(t1) is the particle motion velocity at the moment t1; Z is the mechanical impedance of the pile section; t X is the time corresponding to the defect reflection peak; x is the distance from the pile defect to the sensor installation point; R x It is the estimated value of soil resistance above the defect.

8. The intelligent perception system for properties of prefabricated pipe pile connection nodes according to claim 5 is characterized in that: The specific determination formula for determining the position of pile body defects is as follows: Where x is the distance from the pile defect to the sensor installation point, t1 is the time corresponding to the first velocity peak; t X is the time corresponding to the defect reflection peak; c is the defect coefficient; K is the anti-overturning coefficient.

9. The intelligent perception system for properties of prefabricated pipe pile connection nodes according to claim 8 is characterized in that: The method for obtaining the real-time feedback and early warning is as follows: According to the size of the pile body integrity coefficient and the distance from the pile body defect to the sensor installation point, the pile body integrity category is divided into four categories: Category I: β = 1.0, x = 0; Category II: 0.8 ≤ β < 1.0, 0 ≤ x < 0.2; Category III: 0.6 ≤ β < 0.8, 0.2 ≤ x < 0.4; Category IV: β < 0.6, x > 0.4; When the pile body integrity category does not belong to Class III and Class IV, it exceeds the safety threshold and there are problems of pile body fracture and pile top crushing. Early warning and alarm are required, and the construction plan should be adjusted and the construction parameters should be optimized to ensure that the stress state and posture changes of the prefabricated pipe pile connection nodes are within a safe and controllable range.

10. A method for intelligently sensing the properties of prefabricated pipe pile connection nodes, characterized in that: The following steps are involved: Intelligent sensing sensors are buried at corresponding positions of the pile body, and the sensors are used to accurately sense the strain and tilt angle of the connection nodes; Collect data from the sensor. The data acquisition module uses a high-precision data acquisition card and transmits the data to the data processing and analysis module through a built-in data transmission protocol; The collected data is filtered and the axial force, bending moment and inclination angle at the connection node are calculated through the built-in algorithm, and compared with the preset parameter values ​​to verify the stability and predict the pile body condition; A real-time feedback signal is generated based on the calculation results of the processing and analysis module and displayed to the construction personnel through mobile devices, and an alarm is issued according to the preset safety threshold.

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