Hangzhou Bay Bridge Safety Equipment Application Plan

The Hangzhou Bay Sea-crossing Bridge is a cross-sea bridge spanning the waters of Hangzhou Bay, China, with a total length of 36 kilometers. The bridge is located in the estuary bay of the Qiantang River. It is a convenient route for the national highway main line, Shenhai Expressway, across the Hangzhou Bay. It is part of the Hangzhou Bay Loop of the National Highway Network. The opening of the bridge shortens the travel distance between Ningbo and Shanghai. Kilometers. Thereby greatly reducing the pressure on the Shanghai-Hangzhou-Ningbo Expressway and forming a two-hour traffic circle with Jiangsu as the center.

The Hangzhou Bay Bridge is a civilian and sightseeing high-tech bridge that integrates many advanced engineering technologies. Its traffic organization features are as follows.

· Hangzhou Bay Bridge is 36 kilometers long. There is only one sea platform in the middle of the bridge. There are no upper and lower ramps. Once the vehicle is on the bridge, there is no other direction to choose, and the traffic flow presents a single feature.

· Heavy-duty or over-loaded vehicles in the traffic flow will account for a considerable proportion, and long-term transportation will have certain impact on the safety of the pavement structure of the bridge;

· There is no main line toll station in the entrance direction of Hangzhou Bay Sea-crossing Bridge. The overall traffic control needs to be linked with other road sections of the road network;

·Because most of the entire section of the bridge is located on the sea surface, the bridge traffic is more susceptible to the harsh weather conditions such as high winds, heavy rain and heavy fog.

Therefore, the three major systems of monitoring, communication and charging are the most important and most technical unit projects of the Hangzhou Bay Bridge.

Construction Demand and Analysis of Traffic Monitoring Integrated Platform

The construction unit and the design unit expect that the bridge monitoring system can be realized in the operation phase of the bridge: real-time collection of various types of information related to the bridge traffic, comprehensively obtaining the traffic operation situation of the bridge, the accident situation, the meteorological situation of the bridge area, etc., based on this The configuration information in the database adopts a certain traffic-inducing control strategy to carry out macro management and regulation of all levels of equipment of the bridge, provide fast and safe services for the transportation of the bridge, provide decision support for the monitoring and management personnel, and expect the bridge traffic monitoring system. It plays an important role in operation management and maximizes the social and economic benefits of the Hangzhou Bay Bridge.

Therefore, in the initial stage of the construction of the Hangzhou Bay Bridge Bridge, the construction unit of the Hangzhou Bay Bridge has proposed the following functions according to the overall planning and design of the design department, and the bridge comprehensive monitoring system must be implemented after the bridge is completed and opened to traffic:
· The center image displays the key sections of the bridge in real time, the rescue service platform in the sea, the navigation holes and non-navigable holes in the north and south;

· Accurate and real-time data collection: collect key sections of the bridge, sea service platform, north-south navigation holes and non-navigable holes, real-time data such as meteorology and traffic along the bridge, and store historical data for a long time;

· Provide transportation decision support: timely handle traffic congestion, traffic accidents, road construction, special weather, etc., and provide corresponding traffic guidance control plans;

Real-time monitoring of bridge structure health, bridge load, bridge internal humidity and airway safety, etc., to provide security for the bridge itself, real-time monitoring of power systems, lighting systems and equipment systems to provide physical protection for bridge monitoring;

· Accumulate data, analyze traffic flow rules offline, and provide support for long-term operation of the bridge;

· Share some data with the road network monitoring center, the port monitoring center and adjacent road sections, and establish an emergency linkage mechanism.

Based on the owner's needs and the overall design of the project, Shanghai Dianke Intelligent System Co., Ltd. deepened the specific overall implementation plan based on the original bidding design, and repeatedly communicated with the owner and design unit in the software requirements analysis stage, according to the project specificity. , proposed a targeted software design.

System composition

The traffic monitoring system of Hangzhou Bay Sea-crossing Bridge is mainly divided into three parts: communication system, monitoring external field facilities and monitoring sub-center.

Communication Systems

The Hangzhou Bay Bridge Communication System is divided into two levels, the backbone communication layer and the field access network communication layer. Among them, the backbone communication layer adopts 10 Gigabit routing switch, and a total of 3 sets of backbone equipment are installed in the South Bank Communication Sub-center, the Haizhong platform temporary communication equipment room, and the North Shore service area communication equipment room. The central program-controlled digital switching system completes the voice service exchange in the road section, and the road section The main communication system passes through the south link of Hangzhou Bay Bridge and the backbone node of Ningbo Ring Expressway, and is connected with the backbone communication center of the provincial network. The monitoring and charging data is uploaded to the provincial center in real time.

The site access network layer is mainly composed of two industrial Ethernet ring networks in the field. The industrial Ethernet switches are divided into two ring networks of north and south. The north ring uploads data to the monitoring center through the 10 Gigabit backbone switch in the north shore service area, and the south ring directly accesses. Under the monitoring center 10 Gigabit industrial Ethernet switch, the two ring networks collect and upload the external field device data through a point-to-point single-channel data optical transceiver. Each communication point in the field is equipped with industrial Ethernet switches, digital optical transceivers, video multiplexed optical transceivers and other equipment to complete the bridge monitoring, charging video, image and monitoring sub-center transmission.

The Hangzhou Bay Bridge Communication System is not only the transmission platform for the monitoring system and toll collection system of the Hangzhou Bay Sea-crossing Bridge, but also responsible for uploading and monitoring the monitoring signals of all bridges on the bridge structure health monitoring and power monitoring. A unified plan was made to make the entire system network clear.

Monitoring outfield facilities

The monitoring external field facilities consists of vehicle detectors, surveillance cameras, weather detection equipment, variable information boards and lane control signs, license plate recognition equipment, dynamic weighing, emergency telephone and cable broadcasting systems, fog lights, aviation obstacle lights and other equipment.

Introduction to Vehicle Flow Detection Equipment - There are 32 sets of traffic flow detection equipment on the bridge deck of Hangzhou Bay Bridge, which are installed in the upstream and downstream directions of the Hangzhou Bay Bridge. The video vehicle detector automatically detects traffic events while detecting traffic flow and provides alarms to managers.

Monitoring the external field camera - In order to ensure the monitoring center to carry out all-round monitoring of the Hangzhou Bay Bridge, a total of 136 sets of various types of cameras were installed in the whole bridge. The dense installation of surveillance cameras has realized that there is no “blind zone” for video surveillance of the Hangzhou Bay Bridge.

Meteorological testing equipment set - 11 sets of meteorological monitoring equipment such as visibility / wind speed wind direction / road surface (icing) detector, road surface (icing) detector and full-element weather detection station, through the acquisition of meteorological parameters, as driving safety induced Based on the basis of the bridge health monitoring. And the detection data of the bridge meteorological detector is shared with the Ningbo Meteorological Bureau. The Ningbo Meteorological Bureau will provide a comprehensive meteorological warning and forecasting service for the bridge based on the meteorological data collected by the bridge and the meteorological information of the area.

Information board and lane control sign equipment - The bridge is divided into 8 control sections according to the flat and vertical section linearity and related meteorological data and traffic control needs. Install 5 sets of large variable information boards and 27 sets of lane control signs to adjust and induce the traffic flow on the main bridge to make it uniform, stable and safe.

License plate recognition equipment - In order to ensure traffic safety, support traffic law enforcement and road administration, configure license plate recognition equipment, collect vehicle information, obtain microscopic traffic data, and more concretely reflect the traffic conditions of the bridge.

Dynamic weighing detection equipment - In order to study the impact of overweight vehicles on the bridge deck of the Hangzhou Bay Bridge, the project installs high-speed dynamic weighing detection equipment in the south bank exit direction, which can quickly detect without affecting the normal driving of the vehicle. Overweight vehicles, and through the supporting vehicle capture system and over-limit alarm device to alert and count over-limit vehicles.

Emergency telephone and cable broadcasting equipment - The project uses cable radio and emergency telephone comprehensive utilization system. The emergency telephone on the bridge can not only inform the monitoring center of the emergency time, but also monitor the broadcast effect on the bridge. When the bridge is in the key area (Southern Channel Bridge, Beihang When there is an emergency such as traffic jam, traffic accident or fire on both sides of the road bridge and the platform in the sea, the monitoring sub-center can broadcast, command and dispatch, divert traffic and organize rescue through the bridge cable broadcasting system.

Aviation security light equipment - The project has 6 sets of high-intensity obstacle lights and 18 sets of xenon flash lamps on the three towers.

Monitoring sub-center

The monitoring center equipment is the nerve center of the entire monitoring system. It is the management and control center for traffic monitoring, security monitoring, aviation security, dehumidifier monitoring, cable broadcasting, bridge health and safety testing, and public information services. The monitoring center centralizes all the data and forms a public information service terminal.

These three parts together constitute the monitoring and management system of the Hangzhou Bay Bridge. The monitoring center management system collects and publishes information to the external field equipment through the communication system in real time. At the same time, the subsystems in the monitoring center are relatively independent and interconnected to form a complete Sexual and comprehensive bridge monitoring system.

Integrated monitoring platform structure and characteristics

The overall goal of the Hangzhou Bay Sea-crossing Bridge Monitoring System is to comprehensively monitor all aspects of the bridge road traffic, navigation channels, bridge safety, bridge power supply and distribution, lighting, etc., to provide security and decision support for the smooth operation of the bridge.

The daily monitoring business of the monitoring and management personnel of the Hangzhou Bay Bridge includes: the duty officer handles the traffic incident business; the monitor handles the traffic guidance information release service, the video inspection service, the camera preset position service for setting the insurance route, and the maintenance support service for the equipment. Traffic analysts analyze historical data services, operation and maintenance personnel to manage data quality services, maintain basic data services, and system maintenance services. In order to improve the efficiency of monitoring and management personnel, the integrated operation platform must be a comprehensive operation platform based on intelligent transportation geographic information system. The platform includes data query, equipment control, road state monitoring, traffic guidance and command, release of manual confirmation status, confirmation and release of automatic detection events and status, query and update of static geographic data, and alarm information prompts. A comprehensive operation monitoring platform based on the system main database and GIS application database. Therefore, Shanghai Dianke Intelligent has proposed a comprehensive multi-professional comprehensive monitoring and management system for the bridge (SEITS-BISCS) for the Hangzhou Bay Bridge.

The SEITS-BISCS system is based on the operation and management business process of the Hangzhou Bay Bridge, including the main business line, operation and maintenance main line, and service main line. The three main lines work in parallel and support each other. Operation and maintenance is the guarantee, business is the core, and service is the goal. For these three main lines of work, the system adopts management center, regional control, and on-site control multi-level management. The subsystems are relatively independent from each other, and they form an organic complete on the unified basic information facilities and information sharing exchange system. The overall protection of the bridge is safe, environmentally friendly, efficient and economical.

Later operational support plan

After the opening of the Hangzhou Bay Bridge, the journey from Ningbo to Shanghai will be shortened by more than 120 kilometers, forming a two-hour traffic circle with Jiangsu as the center, so the traffic flow will be very large, and the monitoring system will be improved through the integrated monitoring system platform. The quality of warning and emergency rescue.

First, when an emergency occurs, inform the current traveler or planner of the Hangzhou Bay Bridge to reduce the impact of the emergency on the traffic, or avoid causing secondary accidents and reduce the loss and severity of the incident. Event notification can be achieved by: traffic broadcasting; roadside broadcasting; variable information board; telephone, text message, internet, etc. The notification of the emergency is supported by the software, for example, the content of the notification event, the way or means of providing the event notification, or the direct notification of the event through the roadside broadcast, the variable information board, or the corresponding communication guarantee, such as Use emergency calls, text messages, the Internet, and traffic broadcasts to inform emergency events.

In the event of an emergency, the Hangzhou Bay Bridge should timely share information between the monitoring system, communication system, toll system, structural health monitoring system, power monitoring system, water supply measurement and control automation system, etc., and implement emergency linkage. In the event of an emergency, each of them will do their part, and each other will have the advantage of combining. Guarantee the timely uploading of information and the effective issuance of instructions. At the same time, it is necessary to master the basic information such as the structure and traffic of the Hangzhou Bay Bridge, as well as the preparation of emergency relief materials, rescue agencies, rescue forces and emergency plans, so as to effectively carry out the rescue. Emergency measures.

Since many emergencies have related professional rescue departments, some involve multiple departments. For example, fires and explosions caused by traffic accidents on the main bridge involve transportation, road administration, traffic management, fire protection, hospitals, etc. In this case, it is necessary to contact relevant rescue departments in time to coordinate actions between various departments. Information sharing is implemented. Therefore, when the Hangzhou Bay Bridge is developing an internal coordination mechanism, the rescue process adheres to the principle of clear process and clear responsibilities, clearly aligning the monitoring center with overall coordination, monitoring the integrated platform software, and supporting other departments to reduce unnecessary The contact link ensures that the rescue is efficient and practical.

Conclusion

The Hangzhou Bay Cross-sea Bridge has a large scale, a poor natural environment, high construction requirements, and difficult integration and operation management. In the initial stage of project construction, the project faces many challenges and has been overcome through hard work. At present, after more than one year of operation, the project has achieved remarkable monitoring and control effects, improved the efficiency of the management of the monitoring center of the Bridge Administration, and shortened the emergency response time.

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