What is the cause of the collapse of Jinsha River Bridge in Sichuan?
The reasons for the collapse of Jinsha River Bridge in Sichuan are complicated. First of all, there are problems in design and construction, geological conditions, the use of materials need to be optimized. Secondly, extreme weather such as floods and earthquakes affect structural stability. Moreover, there are loopholes in supervision and maintenance, need to strengthen supervision and maintenance. Accident investigation reveals direct and indirect causes and makes recommendations for improvement.
Section 1 background and general situation of the accident
The Jinsha River Bridge, which spans the Sichuan Basin, is famous for its spectacular momentum and excellent engineering skills. It was built in the 1990s. The bridge has witnessed a historic leap in bridge construction in China, with exquisite design parameters, stable structure and heavy traffic on both sides.
Geographically, the Jinsha River Bridge is located in the middle reaches of the Jinsha River, connecting Ya'an City and Hanyuan County in Sichuan Province. The main span reached 300 meters, becoming the leader of similar bridges in China at that time.
The bridge was designed with the latest Suspension Bridge technology to ensure its anti-seismic and wind-resistant performance. Not only improved the durability of the bridge, but also made it a local landmark.
Section 1 background and general situation of the accident
August 15, 2023, a place in China after wind and rain bridge suddenly collapsed, in the afternoon, a large number of vehicles and pedestrians are passing.
According to preliminary statistics of rescue workers at the scene, the accident caused dozens of casualties, including many children and the elderly.
The collapsed bridge is located in the urban-rural fringe, is an important channel for local residents to travel, the incident, the bridge load-bearing has exceeded the limit.
Section 1 background and general situation of the accident
After the accident, the government quickly started emergency plans, set up a special rescue team, emergency dispatch of relief materials, fully into the rescue operation.
Public security, fire, medical and other departments work closely to carry out a full range of search and rescue work to ensure that the injured get timely treatment.
Damage to infrastructure such as transportation, communications and power supply has been quickly repaired, ensuring the smooth progress of rescue operations.
All sectors of society have extended a helping hand, donated materials, donations, for the rescue work to provide a strong support.
Design and construction of bridge
The complex and changeable geological conditions pose a challenge to the stability of the bridge.
Design parameters should be selected carefully to ensure structural safety and economy.
The use of materials should follow the standard to ensure the engineering quality and durability.
Design and construction of bridge
Construction process needs to be accurate, each process needs to be carefully polished.
Strict quality control, material selection and inspection can not be ignored.
Construction management in order, both progress and safety, to ensure the smooth progress of the project.
Design and construction of bridge
During the construction period, the pier reinforcement may collapse, it is necessary to ensure the stability of support, while testing geological conditions.
When working at high altitude, you must wear a safety helmet, check the safety belt regularly, and make sure the safety rope is connected correctly.
Welding operations, to prevent spark spatter caused by fire, and ensure good ventilation to reduce harmful gas concentration.
Large-scale mechanical operation, need to carry out detailed inspection to ensure good mechanical performance and avoid accidents.
Extreme weather, raging floods, the bridge structure is facing a severe test.
Frequent earthquakes, precarious infrastructure, bridge stability has attracted much attention.
Environmental factors have far-reaching influence on the bridge structure and can not be ignored.
Section 3 Climate and Environment
Jinsha River area climate is changeable, four distinct seasons, high temperature, low temperature, high humidity, drought and other extreme weather phenomena frequent.
These climatic conditions put forward higher requirements for the maintenance of the bridge, such as high temperature weather may lead to expansion and deformation of the steel structure, Low temperatures can cause shrinkage and cracks in concrete.
The stability and safety of the bridge are threatened by the strong wind in the Jinsha River area.
Section 3 Weather and Environmental Factors
Environmental factors played an important role in the bridge collapse, and the erosion of rain led to the damage of the bridge structure.
The influence of wind speed and direction can not be ignored, which aggravates the bridge's shaking and reduces its bearing capacity.
The instability of geological conditions, such as soft soil, also has a negative impact on the stability of the bridge.
Section 4 Supervision and Maintenance Issues
The process of bridge construction involves design audit, construction supervision, daily maintenance and so on.
In order to ensure the safety and reliability of the bridge, the supervision system is constantly improved.
Design audit strictly follow the standards, construction supervision monitoring, daily maintenance and timely handling of problems.
Bridge supervision and maintenance work is essential to ensure traffic safety and social stability.
Section 4 Supervision and Maintenance Issues
Loopholes appear in the regulatory process and need to be examined for potential risks.
Strengthening measures should pay attention to the actual operation to ensure the effect of supervision.
Review and oversight in parallel to achieve maintenance objectives.
Section 4 Supervision and Maintenance Issues
As THE HUB of urban traffic, the maintenance of the bridge is very important.
In the maintenance process, there are many problems to be solved.
Such as lack of capital investment, resulting in maintenance work is difficult to long-term sustainability; lack of technical personnel, affecting the quality of maintenance.
The accident investigation team is composed of senior experts, safety managers and technicians who go deep into the scene for detailed investigation.
The investigation process is rigorous and orderly, covering the scene investigation, accident cause analysis, technical identification and other aspects.
Through careful investigation of the accident scene, the investigation team has a large number of key evidence, which provides strong support for the analysis of the cause of the accident.
Accident Investigation and Conclusion
The investigation results are presented in detail, and the direct and indirect causes of bridge collapse are analyzed one by one.
The structure is complex, the direct reason lies in the material aging, the indirect reason involves the long-term maintenance improper.
The load-bearing capacity of the bridge is affected and extreme weather accelerates the process.
Accident Investigation and Conclusion
After careful analysis, the accident investigation draws a clear conclusion, emphasizing that system failure, human error and environmental factors lead to the accident.
Recommendations for improvement involve improving equipment maintenance standards, enhancing staff training, and optimizing contingency plans.
For equipment failure, will implement a comprehensive overhaul to ensure stable operation; for human error, strengthen operation standard training; for environmental factors, Establish early warning mechanisms.