A safe and stable environment is not only the meaning of building a demonstration area of common prosperity, but also a vivid window to reflect the spirit and attraction of the city. Hangzhou, Zhejiang Province, has comprehensively improved its urban safety risk management and control capacity, and has emerged technology and application scenario Innovation represented by "underground hidden danger intelligent prevention system" and "intelligent three piece set". While improving the people's sense of gain, happiness and security, it has quietly driven deep-seated changes in production mode, lifestyle and governance mode.
urban underground hidden danger intelligent prevention system solves the problem of prevention and control of hidden danger of pavement collapse
With the continuous acceleration of urbanization and the continuous increase of urban population, it has become an inevitable choice for urban development to ask for underground space. At the same time, underground space disasters and accidents caused by various reasons not only threaten the safety of people's lives and property, but also sound an alarm for the safe operation of the city. How to prevent and control underground hidden dangers has become a common problem faced by the scientific construction and safe operation of big cities.
Since Hangzhou became the first batch of pilot cities for new urban construction, Hangzhou urban and Rural Development Commission has focused on the pain and difficulty of underground hidden dangers, such as road collapse. Guided by the concept and method of digital twins, it adheres to large scene and small incision, and takes multi cross scene application as an important starting point to carry out the construction of urban underground hidden danger intelligent prevention scenes, and strive to solve the problems of underground hidden danger detection, control Handle major issues, keep the bottom line of urban safety and ensure the safety of people's lives and property.
Urban underground hidden danger intelligent prevention system is committed to solving the problems of invisible, complex, dangerous and lack of systematicness and predictability. Based on the existing achievements of the provincial spatial governance platform and Hangzhou CIM (urban information model) basic platform, incremental development and iterative upgrading are used to build a multi span scenario of intelligent prevention of urban underground hidden dangers. Pay attention to the combination of static data and dynamic data, and use the urban data model to collect the information elements of housing and urban-rural construction, planning and capital, traffic police, urban management, subway and other departments, and provide static data such as geological conditions, road conditions, deep foundation pit, underground pipeline and heavy-duty vehicle lines, as well as ground penetrating radar The dynamic monitoring data such as subway shield operation sensors are standardized by categories to form a three-dimensional transparent underground map. The risk of pavement collapse is evaluated by analysis algorithm, the prevention and control work is guided by classification, the institutional mechanism of urban underground municipal facilities construction and management is reshaped, and the problem of pavement collapse hidden danger prevention and control is solved.
Based on the three-dimensional base map of underground space, Hangzhou invited professional teams from the Institute of geotechnical engineering of the Chinese Academy of Sciences and Zhejiang University to combine the theoretical research on the mechanism and process of ground collapse and deduce it repeatedly through on-site monitoring practice, Collect and extract multiple influencing factors of underground hidden dangers (including geological soil layer type and thickness, road disease body, service life and material of underground pipeline, artificial disturbance factors such as foundation pit / shield construction, road heavy vehicle load, etc.), develop a comprehensive risk analysis and calculation model of pavement collapse, calculate the outlet risk index, and mark the high, low and low risk areas in the form of red, yellow and green labels Medium and low risk, visually showing a map of the city's road collapse risk. According to a map of pavement collapse risk, a potential safety hazard coordination mechanism of "horizontal to edge and vertical to the end" is established. Horizontal integration of housing, urban and rural construction, regulatory capital, urban management and other industrial departments, as well as urban investment, subway and other construction units, and dynamic monitoring of hidden danger parts; Vertically establish a real-time linkage push mechanism for risk identification information and plans and a feedback mechanism for hidden danger supervision and disposal with districts, counties, cities and territories. For medium and high-risk sections, a structured prevention and control list is also formulated, and a multi department collaborative disposal process of "horizontal and vertical combination" under different risk factors and risk degrees is established.
The underground hidden danger intelligent prevention system initially took Hangzhou Wulinmen area, the core area of Qianjiang New Town, the Asian Games Village and Pinglan road as the test area, with an area of about 13.5 square kilometers. It is being promoted and constructed in the built-up areas of ten districts in Hangzhou, and has initially covered an area of about 109.5 square kilometers in the built-up areas of ten districts. At present, the platform has gathered 89.5 square kilometers of geological body 3D model, 103.5 square kilometers of real scene 3D model, 432 foundation pit projects under construction, 5869 kilometers of various pipelines, 1693 kilometers of heavy vehicle driving routes, 4100 kilometers of urban management inspected roads, 2822 scanned disease body data, 137 subway stations and section outer contour 3D models 56 underground parking lots and 19 underground tunnels.
At present, the urban underground hidden danger intelligent prevention system has preliminarily completed a series of spatial thematic databases, thematic layers and risk assessment algorithm toolbox in the current data coverage area, which can analyze and evaluate the pavement collapse risk and synchronously generate the pavement collapse risk map. Based on the results of evaluation and analysis, the system will push the risk level, risk factors and disposal plans related to risk factors to the territorial and disposal responsible subjects, and trial operation closed-loop disposal measures have been started in the pilot area where hidden dangers are found.
"smart three piece set" perceives security prevention and control dynamics
As the core area of the main urban area of Hangzhou, Xihu District has a large number of old communities and restaurants, complex population composition and great pressure on urban safety risk control. In 2021, the "smart three piece set" (smart inductor, smart gas sense and smart smoke sense) will be installed throughout the West Lake District to redefine the link relationship between the five elements of "people, housing enterprises and things", and build a new urban safety risk management and control network.
Open the platform of comprehensive risk control center for urban safety in West Lake District, and the information such as urban safety index, multi cross cooperative prevention index and IOT intelligent prevention index can be seen at a glance. Through the monitoring data information, the real-time safety risk control status of all towns and streets in West Lake District can be seen at a glance. Establish a unified "information and property network" of "people, property and housing" and "one set of information and property network" of urban and rural areas, and integrate more than 10 functions of "people, property and housing" into "one set of intelligent monitoring system" of "urban and rural public security, enterprise and housing" according to the "five elements of urban and rural construction", Then to the operation mechanism of "resource sharing", realize the efficient connection between the region's IOT perception of "one network" and the "four platforms" of grass-roots governance and the town street integrated intelligent governance platform, and truly achieve "one network unified management and connection from top to bottom". Once a security risk occurs, the "smart three piece set" monitoring alarm will push the alarm information to the user responsible person at the first time, synchronously push it to the "one network" of IOT perception and the "four platforms" of grass-roots governance, and the local town street emergency management service station will send professionals to the alarm point for verification and disposal.
The "smart three piece" IOT sensing device of the terminal can be described as a sensitive "tentacle" that goes deep into people's life and senses the dynamics of security prevention and control.
On November 13, 2021, the street emergency station received the alarm information pushed by the platform, and the smoke sensor of grandma Chen's house, building 3, Qiushi village, Zhejiang University gave an alarm. After receiving the alarm information, the staff arrived at the scene to understand the situation at the first time. It turned out that the old man forgot to cook sweet potatoes at home. After the water in the pot dried up, the thick smoke triggered the alarm. Hearing the alarm, the old man went to the kitchen to turn off the fire in time, which did not lead to further danger. The old man was amazed at the timely response of the emergency station personnel.
In 2021, in order to ensure the safety of electricity, gas and fire for residents, Xihu District of Hangzhou promoted the installation of smart IOT sensing equipment throughout the region, helping to make a benign transformation of safety risk control from "passive disposal after the event" to "active prevention and control in advance".
At present, West Lake District has installed more than 129000 smart inductors, smart gas sensors and smart smoke sensors in special groups such as the elderly living alone, production and operation units such as street shops, supermarkets and rental houses, and public construction units such as schools, hospitals and government agencies. Since 2021, the monitoring platform has issued more than 86000 hidden danger alarms, effectively avoiding 3033 accidents and dangerous situations. The number of fire accidents and production safety responsibility accidents has decreased by 44.3% and 41.7% year-on-year, and the praise rate of residents for event handling has reached 99.8%. The "three piece set of wisdom" of "practical, effective, easy to use and grounded" has been continuously improved in the practical examination. It is reported that by the end of 2021, the region has completed the installation of gas sensing equipment for all bottled gas users, and the installation of inductance, smoke sensing and pipeline gas sensing equipment for all elderly people living alone and all production and business units.
(source: China Construction News Network)
