Deep foundation pit monitoring method and system

Abstract

The invention discloses a deep foundation pit monitoring method and system, and the system comprises displacement sensors, a Beidou navigation positioning base station, a monitoring controller, a terminal data processing device, a data storage device, and an Internet of Things transmission device, the displacement sensors are pre-buried in the monitoring position of a foundation pit through a grid layout, and are interconnected, intercommunicated, crossed and fused. The real-time measurement of the distance change among the displacement sensors is realized; the detection distance change is transmitted to a monitoring controller in real time through a base station, and the deformation condition of the deep foundation pit is judged after the detection distance change is analyzed by the monitoring controller; the data terminal processing equipment can perform error correction on the monitoring data through a difference technology, real-time monitoring of the deep foundation pit is realized, data processing and error correction can truly reflect the deformation phenomenon of the deep foundation pit, the monitoring precision is improved, whether the displacement deformation of the deep foundation pit is within a safety range is judged, and advanced early warning can effectively prevent accidents. And casualties, equipment damage and influence on safety of surrounding buildings caused by sudden collapse and instability of the foundation pit are avoided.

Description

[0001] This application is a divisional application. The original application is titled "Monitoring system and monitoring method for deep foundation pit based on Beidou positioning system." The application number is 202110100449.5, and the application date is January 26, 2021. Technical Field

[0002] The present invention relates to the technical field of building foundation safety monitoring, and in particular to a monitoring system and a monitoring method for a deep foundation pit based on a Beidou positioning system. Background Art

[0003] With the continuous development of urbanization in my country, there are more and more high-rise and super-high-rise buildings, large-scale urban commercial communities, subway projects, high-speed rail station projects, underground commercial complex projects, and other projects. As a result, the safety issues of deep foundation pits are constantly emerging. According to statistics, thousands of collapse accidents caused by foundation pit excavation construction occur each year, resulting in serious casualties and economic losses. Most of these accidents occur due to unreasonable foundation pit monitoring layout, insufficient monitoring accuracy, data transmission loopholes, or imperfect monitoring systems. The construction safety issues of deep foundation pits have received widespread attention from the society. How to monitor foundation pit deformation in a timely and effective manner during the construction process has become a key part of foundation engineering construction. How to develop a remote early warning monitoring and real-time forecasting system for foundation pits is an urgent problem to be solved. With the continuous emergence of emerging technologies such as the Internet of Things, Beidou navigation and positioning, and digital information processing, it has also provided strong support for the development of foundation pit deformation monitoring technology.

[0004] The excavation and construction process of deep foundation pits will not only cause the internal force relaxation and displacement changes of the supporting structure, but also lead to the overturning, deformation and destruction of the soil on the slope of the foundation pit, endangering the stability of the foundation pit, threatening the safety of personnel, affecting the safety of surrounding buildings, triggering major engineering accidents, and causing serious casualties and economic losses. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a monitoring system and a monitoring method for deep foundation pits based on the Beidou positioning system.

[0006] The technical solution for achieving the purpose of the present invention is:

[0007] A monitoring system for deep foundation pits based on the Beidou positioning system includes displacement sensors, a Beidou navigation and positioning base station, a monitoring controller, terminal data processing equipment, data storage equipment, Internet of Things transmission equipment, and a host computer. The inner wall area of the deep foundation pit to be monitored is divided into a grid. Several displacement sensors are pre-buried at the grid nodes. The displacement sensors communicate with each other, monitor the distance between each other in real time, and transmit the monitored distance to the Beidou navigation and positioning base station in real time.

[0008] The described Beidou navigation and positioning base station is arranged around the deep foundation pit, wirelessly connected to each displacement sensor, receives the data transmitted by the displacement sensor, and transmits the received data to the monitoring controller;

[0009] The described monitoring controller is respectively connected to the Beidou navigation and positioning base station, the Internet of Things transmission device, and the data storage device. The monitoring controller receives the data transmitted by the Beidou navigation and positioning base station and stores it in the data storage device, analyzes and calculates the received data, retrieves the initial data stored in the data storage device for comparison with the result of the analysis and calculation, and transmits the comparison result to the terminal data processing device through the Internet of Things transmission device; The terminal data processing device extracts the original data stored in the data storage device, corrects the received data for errors, stores and visualizes the correction result. The management personnel judge whether it is abnormal according to the visualized data, so as to grasp the soil deformation situation in the deep foundation pit in real time.

[0010] For the described grid nodes, the distance between adjacent grid nodes is 8 - 15m.

[0011] The grid is also provided with a temperature sensor and a humidity sensor. The temperature sensor and the humidity sensor are arranged at the intersection of the grid diagonal. The temperature sensor and the humidity sensor are respectively connected to the Beidou navigation and positioning base station, and the monitored temperature and humidity are transmitted to the monitoring controller in real time through the Beidou navigation and positioning base station. The monitoring controller stores the received temperature in the data storage device and transmits it to the terminal data processing device through the Internet of Things transmission device. The terminal data processing device extracts the original data stored in the data storage device, corrects the received data for errors, stores and visualizes the correction result. The management personnel judge whether it is abnormal according to the visualized temperature and humidity data, so as to grasp the temperature and humidity situation in the deep foundation pit in real time.

[0012] The described displacement sensor, temperature sensor, and humidity sensor have a wireless transmission function and are self - powered or powered by an external independent power supply.

[0013] A monitoring method for a monitoring system for deep foundation pits based on the Beidou positioning system includes the following steps:

[0014] 1) Arrange all displacement sensors, temperature sensors, and humidity sensors on the inner side wall of the deep foundation pit according to the grid method. The displacement sensor transmits the initial distance data of the adjacent sensors, and the temperature sensor and the humidity sensor transmit the initial temperature and humidity data in the foundation pit to the monitoring controller through the Beidou navigation and positioning base station and store them in the data storage device;

[0015] 2) During the monitoring process of the deep foundation pit, the displacement sensor transmits the distances between adjacent displacement sensors monitored in real time, as well as the temperature and humidity monitored in real time by the temperature sensor and humidity sensor, to the monitoring controller through the Beidou navigation positioning base station;

[0016] 3) The monitoring controller receives the data transmitted by the Beidou navigation positioning base station and stores it in the data storage device, analyzes and calculates the received data, retrieves the initial data stored in the data storage device and compares it with the results of the analysis and calculation, and transmits the comparison results to the terminal data processing device through the Internet of Things transmission device;

[0017] 4) The terminal data processing device extracts the original data stored in the data storage device, corrects the errors of the received data, visualizes the correction results, and the management personnel judge whether it is abnormal according to the visualized data. The administrator judges whether the data is abnormal according to the data displayed by the terminal data processing device. When the data is abnormal, an abnormal alarm is made;

[0018] The displacement sensor obtains the distance between displacement sensors by the time-of-flight method or the variable magnetic flux method; the error correction is to correct the errors of the data by using the differential technology.

[0019] A monitoring system and method for deep foundation pits based on the Beidou positioning system provided by the present invention. The system pre-buries displacement sensors at key deformation parts of the deep foundation pit, enables the displacement sensors to communicate with each other, and can automatically measure the distances between two displacement sensors during the monitoring process. The displacement sensors are cross-connected with the base station and the monitoring controller, so that the data detected by sensors such as displacement, humidity, and temperature can be transmitted to the monitoring controller in a timely and efficient manner, so that the monitoring controller can instantly analyze whether there are abnormalities in the data such as displacement, temperature, and humidity changes detected by the displacement sensors, realize the real-time monitoring of the deep foundation pit, and the data processing and error correction can truly reflect the deformation phenomenon of the deep foundation pit, judge whether the displacement deformation of the deep foundation pit is within the safe range, and the early warning can effectively prevent accidents from occurring, avoid the sudden landslide and instability of the foundation pit, cause casualties, equipment damage, and affect the safety of surrounding buildings. The data stored in the terminal database can establish a database through data collection, providing data support for the foundation pit monitoring project. Description of the Drawings

[0020] Figure 1 It is a structural block diagram of a monitoring system for deep foundation pits based on the Beidou positioning system;

[0021] Figure 2 It is a schematic diagram of the sensor arranged on the grid divided by the inner side wall area of the deep foundation pit;

[0022] Figure 3The present invention is a flow chart of a monitoring method for a deep foundation pit monitoring system based on the Beidou positioning system. DETAILED DESCRIPTION

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments, but the present invention is not limited thereto.

[0024] Example:

[0025] A monitoring system for deep foundation pits based on Beidou positioning system, such as Figure 1 As shown in the figure, it includes displacement sensors, Beidou navigation positioning base stations, monitoring controllers, terminal data processing equipment, data storage equipment, and Internet of Things transmission equipment. The inner wall area of the deep foundation pit to be monitored is divided into grids, and several displacement sensors are pre-buried at the grid nodes, such as Figure 2 As shown, the displacement sensors communicate with each other, that is, the displacement sensors correspond to each other and are interconnected. The distance between the displacement sensors is obtained by implanting corresponding programs inside the displacement sensors through the time-of-flight method or the variable magnetic flux method, and the monitored distance is transmitted to the Beidou navigation and positioning base station in real time;

[0026] In this embodiment, before the construction of waterproof maintenance structures such as underground continuous walls and guide walls in deep foundation pits, displacement sensors are pre-buried in the foundation parts of the steel cages of the maintenance structures corresponding to the grid nodes according to the divided grids, so that all displacement sensors are effectively pre-buried on the inner walls of the deep foundation pits.

[0027] The Beidou navigation and positioning base station is arranged around the deep foundation pit, wirelessly connected to each displacement sensor, receives data transmitted by the displacement sensor, and transmits the received data to the monitoring controller;

[0028] The monitoring controller is connected to the Beidou navigation positioning base station, the Internet of Things transmission equipment and the data storage equipment respectively. The monitoring controller is arranged in the monitoring room to avoid external interference, protect the monitoring controller, ensure the normal control of the monitoring controller, and is also conducive to the maintenance and maintenance of the monitoring controller. The monitoring controller receives data transmitted from the Beidou navigation positioning base station and stores it in the data storage device, and analyzes and calculates the received data, retrieves the initial data stored in the data storage device and compares it with the analysis and calculation results, and transmits the comparison results to the terminal data processing device through the Internet of Things transmission equipment; the terminal data processing device extracts the original data stored in the data storage device, corrects the errors of the received data, and stores and visualizes the correction results. The management personnel judge whether there is an abnormality based on the visualized data, thereby grasping the soil deformation in the deep foundation pit in real time, effectively avoiding the occurrence of foundation pit deformation and collapse accidents, and ensuring the safety of construction personnel, equipment, surrounding buildings, etc.

[0029] In this embodiment, the terminal data processing device can be an intelligent mobile terminal (smartphone, tablet computer) or a portable computer, etc.

[0030] For the grid nodes described, the distance between adjacent grid nodes is 8 - 15 m. The distance setting between displacement sensors needs to satisfy that the distances such as the horizontal position, settlement, or inclination detected by the monitoring controller can effectively identify the deformation situation of the deep foundation pit. In this embodiment, the distance between adjacent grid nodes is 9 m.

[0031] In the specific implementation of the deep foundation pit project, the environmental changes of the deep foundation pit are also one of the important factors, which need to be grasped by the management personnel in a timely and accurate manner. In order to facilitate the grasping of the environmental information of the deep foundation pit. Therefore, temperature sensors and humidity sensors are also provided in the grids divided in the inner sidewall area of the deep foundation pit. The temperature sensors and humidity sensors are arranged at the intersection points of the grid diagonals. The temperature sensors and humidity sensors are respectively connected to the Beidou navigation and positioning base station. The monitored temperature and humidity are transmitted to the monitoring controller in real time through the Beidou navigation and positioning base station. The monitoring controller stores the received temperature in the data storage device and transmits it to the terminal data processing device through the Internet of Things transmission device. The terminal data processing device extracts the original data stored in the data storage device, corrects the received data for errors, stores and visualizes the correction results. The management personnel judge whether it is abnormal according to the visualized temperature and humidity data, so as to grasp the temperature and humidity conditions in the deep foundation pit in real time.

[0032] The displacement sensors, temperature sensors, and humidity sensors described have a wireless transmission function and are powered by a built-in power module or an external independent power supply; when powered by a built-in power module, the built-in power supply needs to have strong power storage capacity and can continuously supply power for 24 - 36 months to reduce the maintenance frequency of the monitoring system; when powered by an external independent power supply, the external power input line is connected to the sensor by means of underground embedding to supply power to the sensor to ensure the normal operation of each sensor.

[0033] A monitoring method for a monitoring system for a deep foundation pit based on the Beidou positioning system, as Figure 3 shown, includes the following steps:

[0034] 1) Arrange all displacement sensors, temperature sensors, and humidity sensors on the inner sidewall of the deep foundation pit according to the grid method. The displacement sensors transmit the initial distance data of the adjacent sensors, and the temperature sensors and humidity sensors transmit the initial temperature and humidity data in the foundation pit to the monitoring controller through the Beidou navigation and positioning base station, and store them in the data storage device for real-time recording and storage;

[0035] 2) During the monitoring process of the deep foundation pit, the displacement sensor transmits the distance between adjacent displacement sensors monitored in real time, as well as the temperature and humidity monitored in real time by the temperature sensor and humidity sensor, to the monitoring controller through the Beidou navigation positioning base station;

[0036] 3) The monitoring controller receives the data transmitted by the Beidou navigation positioning base station, stores it in the data storage device, analyzes and calculates the received data, retrieves the initial data stored in the data storage device for comparison with the results of the analysis and calculation, and transmits the comparison results to the terminal data processing device through the Internet of Things transmission device;

[0037] 4) The terminal data processing device extracts the original data stored in the data storage device, corrects the errors of the received data, visualizes the correction results, and the management personnel judge whether it is abnormal according to the visualized data. The administrator judges whether the data is abnormal according to the data displayed by the terminal data processing device. When the data is abnormal, an abnormal alarm is issued;

[0038] Specifically: when the real-time detection distance of the grid displacement sensor is different from the initially stored distance, it can be judged that the deep foundation pit has deformed. When the set warning distance is exceeded, the system starts to alarm.

[0039] When the obtained real-time detection distance is different from the initially stored distance, it indicates that the distance between the interconnected displacement sensors in the grid has changed. The terminal data processing device will automatically identify the positions of the displacement sensors in the grid, and judge the specific deformation data such as horizontal displacement, settlement or inclination, and judge the deformation level of the deep foundation pit.

[0040] The displacement sensor obtains the distance between displacement sensors by the time-of-flight method or the variable magnetic flux method, which is specifically determined according to the model and use function of the displacement sensor selected by the method. In this embodiment, the time-of-flight method and the variable magnetic flux method principles are specifically taken as examples. The principle of the time-of-flight method is to emit a specific energy beam and record the time from the emission to the return of the specific energy beam between the grid displacement sensors. The time interval can calculate the distance between the grid displacement sensors. The principle of the variable magnetic flux method is to detect the distance by the influence of the magnetic field change of the corresponding displacement sensors in the grid at different distances. According to the magnetic field change, the real-time change of the distance can be effectively detected.

[0041] The error correction mentioned above is to correct the error of the data by using the differential technology, and the error correction can be carried out according to the big data database.

[0042] In summary, the present invention provides a monitoring system and a monitoring method for deep foundation pits based on the Beidou positioning system. The monitoring system includes displacement sensors, Beidou navigation and positioning base stations, monitoring controllers, terminal data processing devices, data storage devices, and Internet of Things transmission devices. The displacement sensors are embedded in the foundation pit monitoring positions through a grid layout, and the Beidou navigation and positioning base stations, monitoring controllers, Internet of Things transmission devices, and data processing devices are wirelessly connected; the displacement sensors communicate with each other and cross-integrate to realize real-time measurement of the distance changes between the displacement sensors; the embedded displacement sensors can transmit the detected distance changes to the monitoring controller in real time through the base station. After analyzing the detected distance changes by the monitoring controller, the deformation situation of the deep foundation pit can be judged; the data terminal processing device can correct the errors of the monitoring data through differential technology and store the data processing results in the foundation pit monitoring database, realizing real-time monitoring of the deep foundation pit. The data processing and error correction can truly reflect the phenomenon of the deformation of the deep foundation pit, judge whether the displacement deformation of the deep foundation pit is within the safe range, and the early warning can effectively prevent accidents from occurring, avoiding sudden landslides and instability of the foundation pit, resulting in casualties, equipment damage, and affecting the safety of surrounding buildings.

Claims

1. A deep foundation pit monitoring method, characterized in that, include: S1: Displacement sensors, temperature sensors, and humidity sensors are arranged on the inner wall of the deep foundation pit in a grid method. The displacement sensors transmit the initial distance data of the adjacent sensors, and the temperature sensors and humidity sensors transmit the initial temperature and humidity data in the foundation pit to the monitoring controller through the Beidou navigation positioning base station and store them in the data storage device. The displacement sensors described above obtain the distance between the displacement sensors by a time-of-flight method or a variable magnetic flux method; The process of obtaining the distance between displacement sensors by the time-of-flight method includes: emitting a specific energy beam, recording the time from the emission to the return of the energy beam between the displacement sensors in the grid, and calculating the distance between the displacement sensors in the grid based on the time interval; The process of obtaining the distance between displacement sensors using the variable magnetic flux method includes: obtaining the magnetic field changes of the corresponding displacement sensors in the grid at different distances, and detecting the real-time change of the distance based on the magnetic field changes; S2: During the deep foundation pit monitoring process, the displacement sensor will monitor the distance between adjacent displacement sensors in real time, and the temperature and humidity sensors will monitor the temperature and humidity in real time, which will be transmitted to the monitoring controller via the Beidou navigation positioning base station; S3: The monitoring controller receives data transmitted from the Beidou navigation and positioning base station and stores it in a data storage device, analyzes and calculates the received data, retrieves the initial data stored in the data storage device and compares it with the analysis and calculation results, and transmits the comparison results to the terminal data processing device through the Internet of Things transmission device; S4: The terminal data processing device extracts the original data stored in the data storage device, performs error correction on the received data, and visualizes the correction results. The administrator determines whether there is an abnormality based on the visualized data. The administrator determines whether the data is abnormal based on the data displayed by the terminal data processing device. If the data is abnormal, an abnormality alarm is issued; The S4 also includes: when the terminal data processing detects that the real-time detection distance of the grid displacement sensor is different from the initially stored distance, it is determined that the deep foundation pit is deformed, and when the set warning distance is exceeded, the system starts to alarm.

2. The method according to claim 1, wherein The error correction specifically includes: using differential technology to perform error correction on data.

3. A deep foundation pit monitoring system for implementing the deep foundation pit monitoring method described in any one of claims 1-2, characterized in that, The system includes displacement sensors, Beidou navigation and positioning base stations, monitoring controllers, terminal data processing equipment, data storage equipment, Internet of Things transmission equipment, and a host computer. The inner wall area of the deep foundation pit to be monitored is divided into grids. Several displacement sensors are pre-buried at the grid nodes. Each displacement sensor communicates with each other, monitors the distance between the displacement sensors in real time, and transmits the monitored distance to the Beidou navigation and positioning base station in real time. The distance between adjacent grid nodes is 8-15m; The Beidou navigation and positioning base station is arranged around the deep foundation pit, wirelessly connected to each displacement sensor, receives data transmitted by the displacement sensor, and transmits the received data to the monitoring controller; The described monitoring controller is respectively connected to a Beidou navigation and positioning base station, an Internet of Things transmission device, and a data storage device. The monitoring controller receives the data transmitted by the Beidou navigation and positioning base station, stores it in the data storage device, analyzes and calculates the received data, retrieves the initial data stored in the data storage device for comparison with the result of the analysis and calculation, and transmits the comparison result to the terminal data processing device through the Internet of Things transmission device; The terminal data processing device extracts the original data stored in the data storage device, corrects the error of the received data, stores and visualizes the correction result. The management personnel judge whether it is abnormal according to the visualized data, so as to master the soil deformation situation in the deep foundation pit in real time.

4. The system according to claim 3, characterized in that Temperature sensors and humidity sensors are also arranged in the grid. The temperature sensors and humidity sensors are arranged at the intersection of the grid diagonal. The temperature sensors and humidity sensors are respectively connected to the Beidou navigation and positioning base station. The monitored temperature and humidity are transmitted to the monitoring controller in real time through the Beidou navigation and positioning base station. The monitoring controller stores the received temperature in the data storage device and transmits it to the terminal data processing device through the Internet of Things transmission device. The terminal data processing device extracts the original data stored in the data storage device, corrects the error of the received data, stores and visualizes the correction result. The management personnel judge whether it is abnormal according to the visualized temperature and humidity data, so as to master the temperature and humidity situation in the deep foundation pit in real time.

5. The system according to claim 3, characterized in that, The displacement sensors, temperature sensors, and humidity sensors have a wireless transmission function and are self-powered or powered by an external independent power supply.

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