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Online Monitoring System for Subgrade Settlement Cracks
Monitoring Content
The online automated monitoring system for settlement cracks has achieved comprehensive wireless automated monitoring of roadbed settlement.
1. Monitoring of horizontal displacement settlement on the roadbed surface
2. Monitoring of horizontal displacement inside the roadbed body
3. Monitoring of groundwater pressure during excavation of the foundation pit
4. Monitoring of groundwater level during excavation of the foundation pit
5. Monitoring of lateral soil pressure during excavation of the foundation pit
6. Monitoring of internal forces in pile foundations
System Introduction
The online monitoring system for settlement cracks utilizes sensor technology, signal transmission technology, as well as network technology and software technology, to monitor key technical indicators affecting pipeline settlement safety from a comprehensive macro and micro perspective, record historical and current data, and analyze future trends to assist monitoring operation units in decision-making, enhance safety assurance levels, and effectively prevent and curb major accidents.
The system relies on an intelligent software system to establish a settlement early warning model, integrating with a short message platform. When anomalies occur, it automatically sends short messages to the monitoring management personnel's mobile phones in a timely manner to quickly initiate corresponding contingency plans.
System Composition
The system consists of sensors, data acquisition devices, wireless signal transmission devices, central signal receiving and processing devices, computer rooms, and software systems.
The system establishes an open data interface, which can connect to the public internet through dedicated lines or networks, or within bandwidth limits, allowing for remote access or remote expert consultations.
System Functions
On-site data is sent to the monitoring center PC via wireless GPRS transmission devices. The software automatically converts the measured data and directly outputs the monitored physical quantities for data transmission over the network or through an internal local area network, completing the collection and monitoring of sensor data. The software can set upper limit alarm commands, and mobile SMS alarms can be monitored in real-time. Data collection and monitoring can be conducted by connecting the PC to the INTERNET.
Introduction to Static Leveling Instruments
Static leveling instruments belong to geotechnical engineering monitoring equipment, consisting of a series of intelligent liquid level sensors and storage tanks connected by communicating pipes. The reference tank is placed at a stable horizontal reference point, while other storage tanks are placed at approximately the same elevation in different locations. When other storage tanks rise or fall relative to the reference tank, it will cause the liquid level in that tank to rise or fall. By measuring the change in liquid level, the relative vertical deformation of the measured point to the reference point can be understood.
1. A uniquely generated address is automatically created, and an electronic tag (containing product specifications, model, parameters, production date, etc.) is built-in. Users can also set their own identification numbers based on the sensor installation location (such as specific installation locations), making it convenient for users to quickly and accurately identify and locate sensors.
2. The sensor is equipped with internationally advanced computing chips that automatically convert the measured data, directly outputting monitored physical quantities without manual conversion, significantly reducing manual labor intensity.
3. The sensor can automatically perform real-time temperature compensation, improving the sensor's adaptability under different climatic conditions and the accuracy of monitoring data.
4. It can be directly connected to a bus for network monitoring and data collection.
Technical Route of Monitoring
According to the client's requirements: use liquid settlement gauges (static leveling) for automatic settlement monitoring during construction. The advantages of this system are: high precision; it can achieve automated data collection. To ensure the continuity and accuracy of monitoring data for long-term deformation monitoring in the future, we suggest that your company simultaneously set up manual monitoring to verify the authenticity and reliability of the data, comparing it with our automated system for double insurance against deviations.
Introduction to Monitoring Methods
Monitoring systems are established based on the need to protect monitored foundations, with a working base station set up on solid buildings outside the affected area, and monitoring points set at corresponding deformation characteristic locations.
Testing Principles and Methods
This plan selects static leveling instruments and their transmitters with RS485 telemetry interfaces.
Monitoring Basis
(1) "Engineering Surveying Code" (GB50026-2007);
(2) "Building Deformation Measurement Code" (JGJ8-2007);
(3) "National First and Second Level Leveling Measurement Code" (GB12897-91);
(4) "Technical Guidelines for Evaluating the Conditions for Laying Ballastless Track on Passenger Dedicated Lines" (Tie Jian She [2006] No. 158);
(5) "Interim Provisions for Measurement Technology of Ballastless Track on Passenger Dedicated Lines" (Tie Jian She [2006] No. 189);
(6) "Interim Measures for Acceptance of Passenger Dedicated Line Construction" (Tie Jian She [2007] No. 183);
(7) "Construction Technical Guidelines for Ballastless Track on Passenger Dedicated Lines" (TZ216-2007);
(8) "Design Guidelines for Ballastless Track on Passenger Dedicated Lines" (Tie Jian She Han [2005] No. 754);
(9) Notice on the "Management Measures for Settlement Monitoring of High-speed Railway Operations" [2010] No. 554;
(10) "Geotechnical Engineering Investigation Code" GB50021-2001;
(11) "Geotechnical Engineering Monitoring Code" YS5229-96;
(12) "Monitoring Regulations for Landslides, Mudslides, and Debris Flows" DZ/T0223-2004;
(13) "Design Code for Lightning Protection of Buildings" GB50057-94;
(14) "Seismic Design Code for Hydraulic Structures" (DL5073-2000);
(15) "Procedures and Requirements for Security Prevention Engineering" GA/T75-94;
(16) "Quality Management System Standards" GB/T 19000-2000 (ISO9000:2000);
(17) "Technical Requirements for Low Power (Short Distance) Radio Equipment - General Requirements";
(18) Relevant regulations from the Ministry of Railways.
Inclination monitoring
X, Y axis, industrial design, small size, low power consumption
Compass heading
X, Y, Z three axis, attitude calculation measurement algorithm
Imu inertial sensor
Three-axis angle, angular velocity, acceleration, magnetic field measurement
Attitude heading reference system
Meet the static, dynamic, high and low temperature of a variety of complex environmental use
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