Zhejiang Urban and Rural Engineering Testing Co., Ltd. is a judicial appraisal and engineering quality testing institution with independent legal person status. It is a registered institution for judicial appraisal by the Zhejiang Provincial High People's Court, has a quality inspection and testing institution qualification certification issued by the Zhejiang Provincial Bureau of Quality and Technical Supervision (No.: 161101061854), and a qualification certificate for construction engineering quality testing issued by the Zhejiang Provincial Department of Housing and Urban-Rural Development (No.: Zhe Jian Jian Zi (16) 01051-CHG). The projects that can be carried out after passing the certification review include approximately 300 testing parameters such as foundation testing, building structure testing, building steel structure testing, and building material sampling testing. The business scope can involve construction engineering fields such as housing construction, bridge engineering, municipal engineering, highways, railways, and communication towers. To meet the current demand for informationization, automation, and real-time monitoring of dangerous building assessments.

      Houses built in the 1970s, 80s, and early 90s have entered the mid-to-late stage of their usage. Due to aging components and inadequate maintenance, safety hazards have increased, compounded by human alterations during the usage phase and environmental factors, which have increased the pressure on housing safety management. Additionally, influenced by the long-standing mindset of 'emphasizing construction while neglecting management', the management of existing houses has been overlooked for a long time. There is no place to check the usage data of houses regarding alterations, changes in usage functions, disasters, and damage conditions, which has caused difficulties in housing management. The safety of housing usage is an important part of public safety, and it is a significant responsibility of the real estate administrative departments of municipal and district (county) people's governments to timely understand and ensure the safety of residential houses for the public.

       Existing Class C dangerous houses have certain utilization value, and most do not meet the conditions for cessation of use or complete demolition. Some Class C dangerous houses have complex usage environments and site conditions, making reinforcement measures difficult to implement. The Chinese have historically valued the concept of living and working in peace, and the quality of houses and the concerns of residents regarding housing quality have always been a focus, especially during severe weather such as typhoons, strong winds, and heavy rain. The total number of Class C dangerous houses is large and dispersed, making it very difficult to rely on competent authorities or communities for daily inspections, and there is a lack of relevant professional knowledge and comprehensive judgment capabilities, making the establishment of a dynamic remote automatic monitoring system for dangerous houses imperative.

       Implementing dynamic monitoring allows for the selection of daily, weekly, or monthly reporting systems based on actual needs, ensuring that monitoring is real-time and that risk avoidance measures (such as organizing personnel to evacuate in emergencies) are based on evidence. Through the dynamic remote automatic monitoring system, managers can clearly see the basic information of the houses, real-time monitoring data from the site (such as house settlement, tilt, cracks, etc.), and risk avoidance suggestions.

       Zhejiang Urban and Rural Engineering Testing Co., Ltd. has a monitoring solution for high-rise buildings based on Beidou high-precision positioning technology. It can dynamically monitor the tilt and settlement of high-rise buildings in real-time and is compatible with traditional sensors such as leveling instruments, accelerometers, and inclinometers.

       By installing tilt sensors at the four corners of dangerous houses (buildings), data on the tilt of the buildings can be obtained; static leveling instruments can be installed at the foundation of the buildings to obtain settlement data; and crack gauges can be installed at wall cracks to obtain data on the width of wall cracks. All sensor data is sent to the cloud server for storage via a wireless DTU control unit's GPRS wireless network at scheduled intervals, and then the client can summarize and analyze the data through remote monitoring software to obtain dynamic assessments of building tilt, settlement, and defect changes.

1. Monitoring system module functions

        Authorized system users can access the building tilt remote monitoring system's central server through the wireless terminal module connected to the building, providing online monitoring services 365 days a year, 24 hours a day.

        · Real-time monitoring:The remote monitoring center's computer regularly inspects each sensor on the buildings, transmitting the data collected by the sensors to the backend data center wirelessly, achieving proactive and real-time monitoring.

        · Timely alarms:Once the data collected by the sensors on the buildings exceeds the safety value, the backend system will actively send alarm information. The alarm methods support various options: computer system alarms, WeChat public account alarms to designated responsible persons' mobile phones, etc., ensuring that maintenance personnel receive information and respond promptly.

        · Remote login:This system uses cloud platform data management technology. System maintenance personnel can log into the monitoring system from any internet-enabled computer in the country to check the tilt indicators of monitored buildings and view device information anytime and anywhere.

       · Hierarchical management:The monitoring system supports user hierarchical management. The system can set multiple users with different management permissions, allowing users with various permissions to view and maintain their respective devices, where the super administrator can manage all devices, while the lowest-level administrator can only view devices within their managed area, greatly facilitating device management.

       · Information inquiry:The monitoring system supports real-time monitoring information inquiries and historical monitoring information inquiries, providing a scientific basis for managers to conduct systematic analyses of the safety status of buildings.

       · Remote management:Supports functions such as remote reboot, remote upgrade, and remote configuration of devices, saving maintenance personnel's time, reducing the workload of repeated site visits, and significantly saving maintenance costs.

       · Massive operation:This monitoring system supports thousands of devices operating online simultaneously, and system engineers will monitor the operational status of the system in real-time and optimize it promptly.

2. Monitoring system interface, sensor installation

        Using GPS and DTU automatic real-time monitoring equipment, inclinometers, crack gauges, and a real-time dynamic monitoring management platform, Class D I-type dangerous houses are monitored every hour; Class C II-type dangerous houses are monitored every two hours. In cases of typhoons and weather changes, as well as government requirements, Class I and II dangerous houses can be monitored every 2 to 5 minutes, with technical personnel on remote duty.