阅读说明：本技术 基于探地雷达扫描的复杂钢板剪力墙节点质量检测方法 (Method for detecting quality of complex steel plate shear wall node based on ground penetrating radar scanning ) 是由 郑书仁 安道尧 郑军 田玉江 任兆兵 刘德辉 郭智华 那志强 于 2019-10-15 设计创作，主要内容包括：一种基于探地雷达扫描的复杂钢板剪力墙节点质量检测方法,属于钢筋混凝土结构施工技术领域,目的在于通过研究雷达图像单道波形对应的振幅参数值,得出一种基于振幅属性规律的识别方法。步骤包括：针对复杂钢板剪力墙节点这个特殊检测对象设置参数；根据最佳扫描效果的要求布置测线,控制雷达天线移动速度；使用MATLAB编程对提取的这幅数值进一步处理分析,根据能量区间和方差区间的交集确定目标体的几何特性,根据交集区域上所有振幅绝对值之和确定目标体介电属性；根据目标体的几何特性和介电属性得出钢板剪力墙复杂节点施工质量的评估指标。本发明具有探测简单高效、操作便捷、节约成本、识别准确、无损伤无污染等优点。(A method for detecting the quality of a complex steel plate shear wall node based on ground penetrating radar scanning belongs to the technical field of reinforced concrete structure construction, and aims to obtain an identification method based on an amplitude attribute rule by researching an amplitude parameter value corresponding to a radar image single-channel waveform. The method comprises the following steps: setting parameters aiming at the special detection object of the complex steel plate shear wall node; arranging a survey line according to the requirement of the optimal scanning effect, and controlling the moving speed of the radar antenna; further processing and analyzing the extracted numerical value by using MATLAB programming, determining the geometric characteristic of the target body according to the intersection of the energy interval and the variance interval, and determining the dielectric property of the target body according to the sum of all amplitude absolute values in the intersection region; and obtaining an evaluation index of the construction quality of the complex node of the steel plate shear wall according to the geometric characteristics and the dielectric properties of the target body. The invention has the advantages of simple and efficient detection, convenient operation, cost saving, accurate identification, no damage, no pollution and the like.)

1. A method for detecting the quality of a complex steel plate shear wall node based on ground penetrating radar scanning is characterized by comprising the following steps: the method comprises the following steps:

firstly, adopting a 1700Hz radar antenna, setting the dielectric constant to be 7, selecting 10ns for a time window, setting the number of sampling points to be 512, selecting a ranging mode to scan, setting the distance between ranging wheels to be 60mm, setting the gain parameter to be 20, selecting superposition to be 8, selecting track spacing to be 5mm, and selecting continuous storage;

secondly, arranging measuring lines with the distance of 5-10cm in the horizontal direction and the vertical direction in a node area to be detected respectively, wherein the length of the measuring lines is not less than 1m, and the radar antenna moves at a constant speed along the measuring lines for testing, wherein the moving speed is 0.2 m/s;

thirdly, after the test is finished, processing the radar original data, extracting amplitude values corresponding to all the single waves in the whole time range after the radar original data are processed, further processing and analyzing the extracted amplitude values by using MATLAB programming, and obtaining a selection interval of target area energy and variance of four reflection echoes including steel plates, reinforcing steel bars, hollows and incompact inside the nodes on the basis of amplitude attributes, wherein the energy refers to the square sum of single-column data in a radar data matrix; the variance refers to the variance of single-row data in the radar data matrix; determining the geometric characteristic of the target body according to the intersection of the energy interval and the variance interval, and determining the dielectric property of the target body according to the sum of all amplitude absolute values in the intersection area;

and fourthly, obtaining an evaluation index of the construction quality of the complex node of the steel plate shear wall according to the geometric characteristics and the dielectric property of the target body, and evaluating the construction quality of the complex node according to the evaluation index.

2. The method for detecting the quality of the complex steel plate shear wall node based on the ground penetrating radar scanning as claimed in claim 1, is characterized in that: thirdly, extracting amplitude values in all time ranges, firstly calculating the sum of squares of all amplitude values on all sampling points of each channel, wherein the sum of squares of the amplitudes on all sampling points of the single-channel waveform represents the energy of the radar echo, the higher the single-channel wave energy value is, the more uneven the medium passing through the channel wave during propagation is, the greater the degree of reflection/refraction is, and the greater the intensity of the reflected wave is; and then calculating the variance of all the single-channel waves in the horizontal direction of the same sampling point in the whole time range, wherein the larger the difference is, the larger the dispersion degree of the amplitude value on the sampling point is, the representing the non-uniform degree of the medium on the depth is, and the larger the variance is, the more non-uniform the medium on the depth is.

Technical Field

The invention belongs to the technical field of reinforced concrete structure construction, and particularly relates to a method for detecting the construction quality of a complex steel plate shear wall node based on ground penetrating radar scanning.

Background

The steel plate shear wall node is used as a complex node in a super high-rise building structure, the stress and the reinforcement are complex, and the reinforcement condition of the node and the pouring effect of concrete in site construction have great influence on whether the node has a good functional state within the design service life. In a super high-rise building structure, more complex nodes are arranged, and the stress and reinforcement arrangement conditions of all the nodes are different, so that for the important complex nodes which are poured, the detection of the actual reinforcement arrangement condition inside the complex nodes and the pouring effect of concrete is difficult. In order to obtain accurate information inside the complex-structure node, nondestructive detection is carried out on the poured important complex node by adopting a ground penetrating radar.

The radar method is a conventional geophysical detection method, electromagnetic waves emitted by an antenna are transmitted in a concrete member, and the defects of the position of a steel bar, the thickness of a protective layer, void, incompact and the like in the concrete structural member can be detected according to the dielectric constant difference of different substances. The method comprises the steps of firstly emitting electromagnetic waves to concrete through a radar emitting antenna, generating reflected electromagnetic waves when the electromagnetic waves encounter an interface with different electromagnetic properties, then receiving the reflected electromagnetic waves through a receiving antenna to obtain a corresponding radar section image and a radar oscillogram, and obtaining defect characters or steel bar positions and the like in the concrete by utilizing the oscillogram obtained by continuous multipoint sampling. When the difference of the electromagnetic properties of the medium in the concrete member is larger, the generated reflected wave signal is stronger, and the detection effect is better. When the quality of the concrete is evaluated, the concrete quality can not be only evaluated by using the strength index, and the lining quality and the construction quality of the concrete can be comprehensively and comprehensively evaluated by considering factors such as the condition of reinforcing steel bars, the lining thickness of the concrete, the compactness, the void and the like.

Disclosure of Invention

The invention aims to provide a method for detecting the construction quality of a complex steel plate shear wall node based on ground penetrating radar scanning.

The invention adopts the following technical scheme:

a method for detecting the quality of a complex steel plate shear wall node based on ground penetrating radar scanning comprises the following steps:

firstly, adopting a 1700Hz radar antenna, setting the dielectric constant to be 7, selecting 10ns for a time window, setting the number of sampling points to be 512, selecting a ranging mode to scan, setting the distance between ranging wheels to be 60mm, setting the gain parameter to be 20, selecting superposition to be 8, selecting track spacing to be 5mm, and selecting continuous storage;

secondly, arranging measuring lines with the distance of 5-10cm in the horizontal direction and the vertical direction in a node area to be detected respectively, wherein the length of the measuring lines is not less than 1m, and the radar antenna moves at a constant speed along the measuring lines for testing, wherein the moving speed is 0.2 m/s;

thirdly, after the test is finished, processing the radar original data, extracting amplitude values corresponding to all the single waves in the whole time range after the radar original data are processed, further processing and analyzing the extracted amplitude values by using MATLAB programming, and obtaining a selection interval of target area energy and variance of four reflection echoes including steel plates, reinforcing steel bars, hollows and incompact inside the nodes on the basis of amplitude attributes, wherein the energy refers to the square sum of single-column data in a radar data matrix; the variance refers to the variance of single-row data in the radar data matrix; determining the geometric characteristic of the target body according to the intersection of the energy interval and the variance interval, and determining the dielectric property of the target body according to the sum of all amplitude absolute values in the intersection area;

and fourthly, obtaining an evaluation index of the construction quality of the complex node of the steel plate shear wall according to the geometric characteristics and the dielectric property of the target body, and evaluating the construction quality of the complex node according to the evaluation index.

Thirdly, extracting amplitude values in all time ranges, firstly calculating the sum of squares of all amplitude values on all sampling points of each channel, wherein the sum of squares of the amplitudes on all sampling points of the single-channel waveform represents the energy of the radar echo, the higher the single-channel wave energy value is, the more uneven the medium passing through the channel wave during propagation is, the greater the degree of reflection/refraction is, and the greater the intensity of the reflected wave is; and then calculating the variance of all the single-channel waves in the horizontal direction of the same sampling point in the whole time range, wherein the larger the difference is, the larger the dispersion degree of the amplitude value on the sampling point is, the representing the non-uniform degree of the medium on the depth is, and the larger the variance is, the more non-uniform the medium on the depth is.

The construction quality evaluation standard which is suitable for the complex node of the steel plate shear wall in a large range is extracted from a plurality of detection results, and the detection technology is convenient to use and popularize.

The invention has the following beneficial effects:

1. the method extracts the amplitude values of all single-channel echoes in the whole time range of the radar image, and obtains the information such as the number of reinforcing bars in the complex node of the steel plate shear wall, the distance between the reinforcing bars, the diameter of the reinforcing bars, the thickness and the number of the steel plate, whether the pouring is not compact and the like by analyzing the energy and the variance of the radar image through MATLAB programming, thereby providing scientific basis for evaluating the construction quality of the complex node of the steel plate shear wall.

2. The method provides accurate and specific important measurement parameters for the special object of the complex node of the steel plate shear wall, and radar data with higher quality and more comprehensive performance can be obtained according to the parameter setting and operation during scanning.

3. According to the invention, based on the MATLAB processing and analyzing results of the amplitude, the construction quality evaluation standard suitable for the complex node of the steel plate shear wall in a large range is summarized and summarized, and a basis is provided for the quality detection work in the engineering field in the future.

4. The method has the advantages of simple and efficient detection, convenient operation, cost saving, accurate identification, no damage, no pollution and the like, and has higher use value and popularization prospect in detecting the construction quality of the complex steel plate shear wall node.

Drawings

FIG. 1 is a flow chart of the detection method of the present invention;

FIG. 2 is a graph of raw radar data for the present invention;

FIG. 3 is a graph of processed radar data according to the present invention;

FIG. 4 is a waveform of a target reflection single trace according to the present invention;

FIG. 5 is a graph of amplitude values of a single echo in the entire time range of the present invention.

Detailed Description

A method for detecting the quality of a complex steel plate shear wall node based on ground penetrating radar scanning comprises the following steps:

firstly, a 1700MHz radar antenna is adopted, the dielectric constant is set to be 7, the time window is selected to be 10ns, the number of sampling points is set to be 512, the distance measurement mode is selected for scanning, the distance measurement wheels are 60mm, the gain parameter is set to be 20, the superposition is selected to be 8, the track spacing is 5mm, and continuous storage is selected;

secondly, arranging measuring lines with the distance of 5-10cm in the horizontal direction and the vertical direction in a node area to be detected respectively, wherein the length of the measuring lines is not less than 1m, and the radar antenna moves at a constant speed along the measuring lines for testing, wherein the moving speed is 0.2 m/s;

thirdly, after the test is finished, processing the radar original data, extracting amplitude values corresponding to all the single waves in the whole time range after the radar original data are processed, further processing and analyzing the extracted amplitude values by using MATLAB programming, and obtaining a selection interval of target area energy and variance of four reflection echoes including steel plates, reinforcing steel bars, hollows and incompact inside the nodes on the basis of amplitude attributes, wherein the energy refers to the square sum of single-column data in a radar data matrix; the variance refers to the variance of single-row data in the radar data matrix; determining the geometric characteristic of the target body according to the intersection of the energy interval and the variance interval, and determining the dielectric property of the target body according to the sum of all amplitude absolute values in the intersection area;

and fourthly, obtaining an evaluation index of the construction quality of the complex node of the steel plate shear wall according to the geometric characteristics and the dielectric property of the target body, and evaluating the construction quality of the complex node according to the evaluation index.

Thirdly, extracting amplitude values in all time ranges, firstly calculating the sum of squares of all amplitude values on all sampling points of each channel, wherein the sum of squares of the amplitudes on all sampling points of the single-channel waveform represents the energy of the radar echo, the higher the single-channel wave energy value is, the more uneven the medium passing through the channel wave during propagation is, the greater the degree of reflection/refraction is, and the greater the intensity of the reflected wave is; and then calculating the variance of all the single-channel waves in the horizontal direction of the same sampling point in the whole time range, wherein the larger the difference is, the larger the dispersion degree of the amplitude value on the sampling point is, the representing the non-uniform degree of the medium on the depth is, and the larger the variance is, the more non-uniform the medium on the depth is.