Intelligent monitoring system for deformation of rammed earth wall construction

Abstract

The application provides a rammed earth wall construction deformation intelligent monitoring system, and is based on the problems of low accuracy, strong subjectivity, low frequency and large labor cost of an existing deformation observation method in a rammed earth wall construction process; through a monitoring image acquisition module, a monitoring image calculation module, a deformation data processing module and a deformation safety early warning module, the rammed earth wall construction deformation process stability, measurement high accuracy and labor cost saving construction monitoring can be achieved in the rammed earth wall construction process of a traditional village.

Description

TECHNICAL FIELD

[0001] The present application relates to a rammed earth wall construction deformation intelligent monitoring system. BACKGROUND

[0002] Traditional villages carry valuable historical memories, but a large number of old houses involve building structure safety, building function loss and other hidden dangers, and need to implement further traditional village building construction and repair. As the main load-bearing structure widely existing in traditional villages, the deformation of rammed earth walls during the repair construction process is related to the safety and quality of the structure.

[0003] At present, traditional villages have many problems such as low construction level and poor construction ability, and generally rely on human eye observation to realize real-time deformation observation of rammed earth walls during construction, or rely on total station and other measuring means to measure the spatial position of rammed earth walls periodically to obtain the deformation of rammed earth walls.

[0004] However, in the existing observation or measurement method, the human eye observation of the deformation of the rammed earth wall is affected by light, background and the like, and the observation deformation result is low in precision and subjective; the measurement using total station and other measuring instruments needs to consume a large amount of manpower and material resources, and the measurement frequency is low and cannot realize real-time monitoring of the deformation of the rammed earth wall during the construction process. SUMMARY

[0005] The purpose of the present application is to provide a rammed earth wall construction deformation intelligent monitoring system.

[0006] To solve the above problems, the present application provides a rammed earth wall construction deformation intelligent monitoring system, comprising:

[0007] A monitoring image acquisition module is used to collect the digital image signal of the monitoring image target point to the electronic computer and transmit it to the monitoring image calculation module.

[0008] A monitoring image calculation module is used to calculate the digital image signal transmitted in the image acquisition module, obtain the displacement information of the target point on the surface of the rammed earth wall, and transmit it to the deformation data processing module.

[0009] A deformation data processing module is used to receive the displacement information of the target point on the surface of the rammed earth wall obtained by the monitoring photography calculation module, analyze the displacement information of the target point on the surface of the rammed earth wall based on the threshold value and the structural deformation characteristics in the construction process obtained by finite element calculation and analysis.

[0010] A deformation safety early warning module is used to grade the early warning of the rammed earth wall construction process based on the analysis of the displacement information of the target point on the surface of the rammed earth wall, and output the early warning signal.

[0011] Further, in the above system, the monitoring image acquisition module comprises:

[0012] The monitoring image target point is arranged at a position with deformation characteristics of the rammed earth wall in the construction process;

[0013] The monitoring image collection part is installed at a position where the monitoring image target point can be clearly photographed to monitor the deformation of the rammed earth wall construction, and is used to collect image features of the monitoring image target point into an electronic computer and transmit them to the monitoring image calculation module.

[0014] Further, in the above system, the monitoring image target point is a surface pattern or a special symbol of the rammed earth wall.

[0015] Further, in the above system, the monitoring image target point is a visible light source or an infrared light source.

[0016] Further, in the above system, the monitoring image collection part is a CCD image sensor that converts optical images into digital signals.

[0017] Further, in the above system, the monitoring image calculation module is used to perform camera calibration by using a homography matrix method; in terms of image tracking and pixel calculation, the gray value of a gray image or the gray value after color image conversion is directly used to track the position of a measured structure or its marker according to selected image features, to determine the position of the structure in each frame of a video or image sequence, and finally calculate the motion of the structure in the image.

[0018] Further, in the above system, the monitoring image calculation module is also used to select a point that does not displace as a reference point according to specific conditions in the construction process, to realize further error correction of the deformation of the rammed earth wall.

[0019] Further, in the above system, the deformation data processing module is used to establish a corresponding finite element model of the structure according to the characteristics of the rammed earth wall structure itself, and to set the allowable deformation limit of the structure under different working conditions as a grading deformation threshold value in the construction process of the rammed earth wall based on mechanical analysis.

[0020] The deformation safety warning module is used to automatically issue a grading alarm when the deformation of the rammed earth wall monitored reaches the corresponding grading deformation threshold value according to the grading deformation threshold value.

[0021] Further, in the above system, the deformation data processing module is configured to, during construction, according to the displacement and time curve shape of the rammed earth wall itself, if it is found that the rammed earth wall structure has a slow and periodic displacement and is highly related to temperature change, the deformation is considered to be temperature deformation; if a preset type of sudden deformation of the rammed earth wall is measured, the construction condition at the time of deformation is combined to determine that it is rammed earth wall structure removal deformation; if a single monitoring image target point has a mutation greater than a preset threshold, and other monitoring image target point information and the on-site construction state do not change, it is judged to be an error caused by light disturbance.

[0022] The deformation safety warning module is configured to issue a corresponding alarm according to the analysis result of the temperature deformation, the rammed earth wall structure removal deformation or the error caused by light disturbance.

[0023] Further, in the above system, the deformation data processing module is further configured to calculate the frequency spectrum of the displacement time domain signal at different monitoring image target points, perform Fourier transform on the displacement and time information, calculate the corresponding frequency information, obtain the modal properties of the self-vibration of the rammed earth wall, and establish a corresponding probability model for the self-vibration frequency.

[0024] The deformation safety warning module is further configured to, based on the probability model, if the self-vibration frequency of the rammed earth wall monitored in real time has a low probability and is less than a preset threshold, issue corresponding alarm information.

[0025] Compared with the prior art, the beneficial effects of the present application mainly include the following points:

[0026] (1) High monitoring accuracy. The present application is based on image monitoring method, which can achieve pixel-level accuracy, much higher than subjective monitoring methods based on human eye observation, and the monitoring achieves high accuracy;

[0027] (2) High monitoring frequency. Compared with daily monitoring by total station, the present application can output the deformation of the rammed earth wall every second, and monitor the details of the deformation of the rammed earth wall in the construction process in real time;

[0028] (3) Intelligent deformation measurement and processing. The present application combines finite element monitoring information with different construction processes to automatically analyze the deformation of the rammed earth wall under different conditions, avoids repeated manual measurement, and realizes intelligent deformation measurement and processing. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is the overall architecture diagram of the rammed earth wall construction deformation intelligent monitoring system of an embodiment of the present application;

[0030] Figure 2 is a schematic diagram of the image acquisition module of the monitoring system of an embodiment of the present application;

[0031] Figure 3 is a schematic diagram of a monitoring image calculation module of an embodiment of the present application;

[0032] Figure 4 is a schematic diagram of a deformation data processing module and a deformation safety warning module of an embodiment of the present application. DETAILED DESCRIPTION

[0033] In order to make the above objectives, features and advantages of the present application more apparent and easy to understand, the present application is further described in detail below with reference to the drawings and specific embodiments.

[0034] As shown in Figures 1 to 4 , the present application provides a rammed earth wall construction deformation intelligent monitoring system, comprising:

[0035] a monitoring image acquisition module, configured to collect digital image signals of monitoring image target points to an electronic computer and transmit the digital image signals to a monitoring image calculation module;

[0036] the monitoring image calculation module, configured to calculate the digital image signals transmitted by the image acquisition module, obtain target point displacement information of a rammed earth wall surface, and transmit the target point displacement information to a deformation data processing module;

[0037] the deformation data processing module, configured to receive the target point displacement information of the rammed earth wall surface obtained by the monitoring image calculation module, analyze the target point displacement information of the rammed earth wall surface based on threshold values obtained by finite element calculation and analysis and structural deformation characteristics in a construction process;

[0038] a deformation safety warning module, configured to perform hierarchical warning in a rammed earth wall construction process based on analysis of the target point displacement information of the rammed earth wall surface and output a warning signal.

[0039] Here, the deformation safety warning module combines the results of the deformation data processing module to realize hierarchical warning in the rammed earth wall construction process and output a warning signal.

[0040] As shown in Figure 2 , in an embodiment of the rammed earth wall construction deformation intelligent monitoring system of the present application, the monitoring image acquisition module comprises:

[0041] a monitoring image target point, disposed at a deformation point to be measured of a rammed earth wall in a construction process, which can take a surface pattern or a special symbol of the rammed earth wall as a monitoring image target point, or can set an active target component according to actual conditions, such as an additional visible light source or an infrared light source;

[0042] Here, the monitoring image target point is generally in the construction process, if the rammed earth wall deforms, the selected monitoring image target with deformation characteristics will follow the deformation of the rammed earth wall and produce displacement; the monitoring image target should be set at the position of the rammed earth wall with certain deformation characteristics to reflect the deformation of the rammed earth wall in the construction process;

[0043] The monitoring image collection part is installed at a position where the monitoring image target point can be clearly photographed to monitor the deformation of the rammed earth wall in construction, and is used for collecting the image features of the monitoring image target point into an electronic computer and transmitting to the monitoring image calculation module;

[0044] Here, a CCD image sensor for converting optical images into digital signals is used, which collects the image features of the monitoring image target point into an electronic computer and transmits to the monitoring image calculation module.

[0045] As shown in Figure 3 , in an embodiment of the intelligent monitoring system for the deformation of the rammed earth wall in construction, the monitoring image calculation module is used for camera calibration by using the homography matrix method; in image tracking and pixel calculation, the gray value of the gray image or the gray value after color image conversion is directly used, the position tracking of the measured structure or its marker is carried out according to the selected image features, so as to determine the position of each frame in the video or image sequence, and finally the motion in the image is calculated; finally, the monitoring image calculation module is also used for selecting the point position which does not displace as a reference point according to the specific situation in the construction process, to realize further error correction of the deformation of the rammed earth wall.

[0046] Here, the main purpose of camera calibration is to find the projection relationship from three-dimensional world coordinates to two-dimensional image coordinates, so as to realize the conversion of each point in the image to the three-dimensional world.

[0047] As shown in Figure 4 , in an embodiment of the intelligent monitoring system for the deformation of the rammed earth wall in construction, the deformation data processing module is used for first establishing a corresponding finite element model for the structure according to the characteristics of the rammed earth wall structure itself, and based on the allowable deformation limit of the structure under different working conditions, the deformation limit is used as the grading deformation threshold in the construction process of the rammed earth wall;

[0048] Then, according to the displacement and time curve form of the rammed earth wall itself in the construction process, if it is found that the rammed earth wall structure has slow and periodic displacement which is highly related to temperature change, the deformation can be considered as temperature deformation;

[0049] According to the displacement and time curve shape of the rammed earth wall itself during construction, if a specific type of sudden deformation of the rammed earth wall is measured, and combined with the construction conditions such as the removal of the bent frame and the removal of part of the wall, the rammed earth wall structure removal deformation is determined.

[0050] According to the displacement and time curve shape of the rammed earth wall itself during construction, if a single monitoring image target point has a mutation greater than a preset threshold, and other monitoring image target point information and the on-site construction state do not change, it can be judged that the error is caused by light disturbance.

[0051] Finally, the frequency spectrum of the displacement time domain signal of the different monitoring image target points is calculated, the displacement and time information are Fourier transformed, the corresponding main frequency information is calculated, the modal properties of the self-vibration of the rammed earth wall are obtained, and the corresponding probability model such as the normal distribution model of the self-vibration frequency is established.

[0052] As shown in Figure 4 , in an embodiment of the rammed earth wall construction deformation intelligent monitoring system of the present application, the deformation safety warning module is used to first, according to the graded deformation threshold of the finite element calculation in the deformation data processing module under different conditions, when the deformation of the rammed earth wall monitoring reaches the corresponding graded deformation threshold, the graded alarm is automatically sent.

[0053] Secondly, according to the analysis result obtained by judging the displacement and time curve shape in the deformation data processing module, if the corresponding abnormal situation (including error caused by light disturbance) occurs, the corresponding alarm is sent.

[0054] Finally, regarding the probability model of the self-vibration frequency distribution, if the self-vibration frequency of the rammed earth wall appears with a low probability and is less than a certain threshold, the corresponding alarm information is also sent.

[0055] In order to solve the problems that the human eye observation of the rammed earth wall deformation is affected by light, background and the like, the observation deformation result has low precision and is subjective, and the measurement of the total station and other measuring instruments needs to consume a lot of manpower and material resources, and the measurement frequency is low and cannot monitor the rammed earth wall deformation in the construction process in real time, the present application proposes a new rammed earth wall construction deformation intelligent monitoring system based on non-contact monitoring, which comprises a monitoring image acquisition module, a monitoring image calculation module, a deformation data processing module and a deformation safety warning module. The overall architecture of the system is shown in Figure 1 .

[0056] In summary, the rammed earth wall construction deformation intelligent monitoring system provided by the application, the image acquisition module of the monitoring system is divided into a monitoring image target point and a monitoring image collection part, the monitoring image target point is arranged at a deformation point to be measured of the rammed earth wall in the construction process, and the deformation image information thereof is obtained through the monitoring image collection part; the monitoring image calculation module calculates the digital image signal transmitted in the image acquisition module, obtains the displacement information of the monitoring position, and transmits the displacement information to the deformation data processing module; the deformation data processing module receives the displacement of the target point on the surface of the rammed earth wall obtained by the monitoring photography calculation module, performs data analysis based on the threshold value and the structural deformation characteristics in the construction process obtained through finite element calculation and analysis; the deformation safety early warning module combines the results of the deformation data processing module, realizes grading early warning in the construction process of the rammed earth wall, and outputs an early warning signal. Thus, the rammed earth wall construction deformation intelligent monitoring method is completed.

[0057] The application provides a new rammed earth wall construction deformation intelligent monitoring system based on non-contact monitoring, which can realize process stability, high measurement accuracy and labor cost saving in the construction monitoring of the deformation of a rammed earth wall in the construction process of a traditional village.

[0058] The application can improve and solve the problems of low accuracy, strong subjectivity, low frequency and high labor cost of the existing rammed earth wall deformation observation method in the construction process.

[0059] Compared with the rammed earth wall deformation monitoring scheme at the present stage, the application has the following advantages:

[0060] (1) High monitoring accuracy. The application is based on an image monitoring method and can achieve pixel-level accuracy, which is much higher than the subjective monitoring method based on human eye observation, and the monitoring accuracy is high;

[0061] (2) High monitoring frequency. Compared with daily monitoring by a total station, the application can output the deformation of the rammed earth wall every second, and can realize real-time monitoring of the deformation details of the rammed earth wall in the construction process;

[0062] (3) Intelligent deformation measurement and processing. The application combines finite element monitoring information and different construction processes, automatically analyzes the deformation of the rammed earth wall under different working conditions, avoids repeated manual measurement, and realizes intelligent deformation measurement and processing.

[0063] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts of each embodiment can be referred to each other.

[0064] Those skilled in the art will further realize that the mechanisms of the various examples described herein are capable of being implemented using any number of combinations of the described features. Accordingly, these aspects, individual elements, or combinations of elements can be replaced or supplemented by other elements that provide the same or similar functionality without departing from the scope of the present disclosure. For example, the functions could be performed by a single unit, or multiple units, of hardware and / or software, and the units could be located in different places, including being distributed among multiple locations. Thus, references to specific features or steps should not be considered as contributing to the novelty of the present disclosure, unless otherwise specifically indicated.

[0065] Obviously, numerous modifications and variations of the present application are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims and their equivalents, the application can be practiced otherwise than as specifically described.

Claims

1. A rammed earth wall construction deformation intelligent monitoring system, characterized in that, The application relates to a monitoring image acquisition module, a monitoring image calculation module, a deformation data processing module and a deformation safety early warning module. The monitoring image acquisition module is used for collecting digital image signals of monitoring image target points into an electronic computer and transmitting the signals to the monitoring image calculation module. The monitoring image calculation module is used for calculating the digital image signals transmitted by the image acquisition module, obtaining target point displacement information of a rammed earth wall surface and transmitting the information to the deformation data processing module. The deformation data processing module is used for receiving the target point displacement information of the rammed earth wall surface obtained by the monitoring image calculation module, analyzing the target point displacement information based on threshold values and structural deformation characteristics in a construction process obtained by finite element calculation and analysis. The deformation safety early warning module is used for grading early warning in the construction process of the rammed earth wall based on the analysis of the target point displacement information of the rammed earth wall surface and outputting early warning signals. The deformation data processing module is used for finding that the rammed earth wall structure has slow and periodic displacement which is highly related to temperature change according to the displacement and time curve shape of the rammed earth wall in the construction process, considering the displacement as temperature deformation, finding that the rammed earth wall has preset type of sudden deformation, determining the deformation as rammed earth wall structure removal deformation based on the construction condition when the deformation occurs, judging that the error is caused by light disturbance when a single monitoring image target point has sudden change greater than a preset threshold value and other monitoring image target point information and the on-site construction state do not change. The deformation safety early warning module is used for issuing corresponding alarms according to the analysis results of the temperature deformation, the rammed earth wall structure removal deformation or the error caused by light disturbance. The deformation data processing module is also used for calculating the frequency spectrum of the displacement time domain signals of different monitoring image target points, carrying out Fourier transform on the displacement and time information, calculating corresponding frequency information, obtaining the modal properties of the rammed earth wall self-vibration and establishing a corresponding probability model for the self-vibration frequency. The deformation safety early warning module is also used for issuing corresponding alarm information when the real-time monitored self-vibration frequency of the rammed earth wall has a low probability and is less than a preset threshold value based on the probability model.

2. The rammed earth wall construction deformation intelligent monitoring system according to claim 1, characterized in that, The monitoring image acquisition module comprises a monitoring image target point and a monitoring image collection part. The monitoring image target point is arranged at a position with deformation characteristics of the rammed earth wall in the construction process. The monitoring image collection part is installed at a position capable of clearly shooting the monitoring image target point to monitor the construction deformation of the rammed earth wall, and is used for collecting image features of the monitoring image target point into an electronic computer and transmitting the features to the monitoring image calculation module.

3. The rammed earth wall construction deformation intelligent monitoring system according to claim 1, characterized in that, The monitoring image target point is a visible light source or an infrared light source.

4. The rammed earth wall construction deformation intelligent monitoring system according to claim 1, characterized in that, The monitoring image collection part is a CCD image sensor which converts optical images into digital signals.

5. The rammed earth wall construction deformation intelligent monitoring system according to claim 1, characterized in that, ​ 6. The rammed earth wall construction deformation intelligent monitoring system according to claim 1, characterized in that, The monitoring image calculation module is configured to calibrate the camera by using a homography matrix method; in terms of image tracking and pixel calculation, the gray scale value of a gray scale image or the gray scale value after conversion of a color image is directly used, and a selected image feature is used to track the position of a measured structure or a marker thereof to determine the position of the measured structure or the marker in each frame of a video or image sequence, and finally calculate the motion of the measured structure or the marker in the image.

7. The rammed earth wall construction deformation intelligent monitoring system according to claim 6, characterized in that, The monitoring image calculation module is further configured to select a point that does not displace as a reference point according to the specific situation in the construction process, and realize further error correction of the deformation of the rammed earth wall. 8.The rammed earth wall construction deformation intelligent monitoring system of claim 1, wherein, The deformation data processing module is configured to establish a corresponding finite element model for the structure according to the characteristics of the rammed earth wall structure, and set the allowable deformation limit of the structure under different working conditions as a grading deformation threshold in the construction process of the rammed earth wall based on mechanical analysis. The deformation safety warning module is configured to automatically issue a grading warning when the deformation of the rammed earth wall reaches the corresponding grading deformation threshold according to the grading deformation threshold.

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