October 22 2007, during a routine inspection of the Voroshilovsky bridge, a crack was discovered, as a result of which the bridge was closed for all types of transport and then for pedestrians for an indefinite period. This increased the load on the other two bridges and further aggravated the transportation situation in the city of Rostov-on-Don. Before the end of 2016, the authorities of Rostov-on-Don intend to reconstruct the Voroshilovsky bridge. The design documentation for the reconstruction of the bridge in the 1 quarter of the 2012 year should be submitted to the state expertise, the start of construction and installation works is planned for the 2013 year with completion in the 2016 year; The total cost of the work is estimated at 6,5 billion rubles.
The main task of monitoring the state of structures of this kind is the timely detection and prevention of damage and prediction of wear. In contrast to the human eye or routine periodic inspections, high-precision electronics operating in continuous mode will allow “to notice” the slightest changes in the behavior of the bridge or in its design. Monitoring the status of the bridge allows you to get arrays of data that can be used for various purposes. The data can be used to obtain information about damage, wear and tear and assess the condition of the bridge in real time, give a signal in time for repair or maintenance works, inform about unexpected incidents and manage the normal operation of the bridge, assist relevant services and departments to respond promptly to any arising or prospective events. Also, these data can be used for research purposes to improve the design of bridges and improve construction technologies.
The problem or task
Monitoring the status of the bridge has some specific features:
- Bridge geographically distributed in space;
- the bridge often works in difficult environmental conditions and at the same time it collects data on its condition;
- Monitoring - a long process that takes place remotely, involving minimal involvement of staff due to structural features and adverse environmental conditions;
- monitoring is a continuous process that proceeds in real time, when a huge flow of data is collected and processed. Smart techniques and technologies are used to collect, process, evaluate, and extract the necessary information from these data.
The listed characteristics create a number of specific features and difficulties that are taken into account when developing an automated System for Monitoring the Construction Status of the Voroshilovsky Bridge.
Given the harsh environments in which to run monitoring stations, they must be resistant to water, humidity, dust, shock and chemical erosion, salt. Furthermore, for obvious reasons, the station must operate with a high degree of fault tolerance, reliability, and be easy to maintain and are accessible for repair. In view of the above requirements to the station is the ideal solution NI cRIO platform. Work stations involves working 24 hours per day, days per week 7 365 days in the year.
The parameters to be monitored in the monitoring process of the bridge, can be divided into three main categories:
- Environment. The bridge is constantly exposed to the adverse effects of the environment: air, water, changes in temperature, precipitation, etc. These factors have a significant impact on the operation of the bridge.
- Maintenance. From a maintenance point of view, factors such as the displacement or flooding of the supports and the bridge, deformation, etc. should be monitored.
- The accident. The dynamic parameters of the bridge are of paramount importance in the context of the consequences of possible accidents occurring on the bridge.
Thus, the main parameters that will be monitored:
- Environmental monitoring:
- ambient temperature;
- Monitoring of static and dynamic characteristics:
- structural deformation;
- structural loads;
- structural dynamics;
- mechanical stresses of bridge structures;
- the offset of the bridge modules;
- construction temperature.