Expert: according to the latest fence standard, Chongqing bus will not fall into the river.

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 Expert: according to the latest fence standard, Chongqing bus will not fall into the river.


Xinjing News On the morning of October 28, a bus from Wanzhou District of Chongqing collided with a car on the bridge deck of the Second Yangtze River Bridge in Wanzhou, and then fell into the river.

According to the report of Wanzhou Branch of Chongqing Public Security Bureau, the accident was caused by a sudden retrograde collision with a normal passenger car, then rushed to the roadside, broke the guardrail and fell into the river.

After the accident, especially after the video release of the bus crash, many netizens questioned the protection performance of the railings of Wanzhou Yangtze River Second Bridge. Some even claimed that the low anti-collision performance of the bridge or aggravated the probability of the bus crash after losing control.

In this regard, Xu Gongyi, Deputy Engineer of China Railway Bridge Survey and Design Institute, told the Beijing News, The protective fence has the function of cushioning impact force, reducing vehicle damage and protecting life safety, but can not completely avoid all accidents.

According to Xu Gongyi, domestic highways are divided into five grades according to the function, traffic volume and other factors. Different sections of highways have different requirements for fences. The main function of Wanzhou Yangtze River Second Bridge is to serve the urban area. The speed limit is within 60km/h. In fact, it is a slow-speed road system, and the design standard of anti-collision barrier will be relatively weak. From the current media reports, the bus is a frontal impact barrier, which is an accidental impact.

On the afternoon of the 29th, a bridge design engineer who did not want to be named told the Beijing News that the Highway Traffic Safety Facilities Design Code issued by the Ministry of Transportation in 2017 stipulated that when choosing the form of guardrail, the protection performance of the guardrail and the deformation degree of the guardrail after impact should be considered, and the selected guardrail must be able to have strength. Effective absorption is designed to design collision energy and block vehicles beyond the designed collision energy beyond the bridge. It is also suggested that the grade of protection for the guardrail of the super suspension bridge should be of eight grades. Public information shows that the second Wanzhou Yangtze River Bridge is a super large suspension bridge type. According to the engineer, Class 8 is the highest level of protection. If the standard of Highway Traffic Safety Facilities Design Code is followed, the bus should not fall into the river. But the Second Yangtze River Bridge in Wanzhou was built in 2001, and the design at that time could not meet the current standard. Now we should increase some effective protective measures to avoid two injuries caused by accidents. The engineer said. In this regard, Tan Danhui, a professor of bridge engineering at Tongji University, told the Beijing News that after the introduction of the new design specifications, it is necessary for the local authorities to assess the actual traffic conditions and serious accidents of bridges, to judge the protection standards of guardrails, and to reinforce the existing hidden dangers or fail to meet the requirements of the protection settings. Supplement. The source of this article: Duan Ruichao, editor of the Beijing News: Cheng Yalong, editor in chief: Zhang Xianchao _NN9310

On the afternoon of the 29th, a bridge design engineer who did not want to be named told the Beijing News that the Highway Traffic Safety Facilities Design Code issued by the Ministry of Transportation in 2017 stipulated that when choosing the form of guardrail, the protection performance of the guardrail and the deformation degree of the guardrail after impact should be considered, and the selected guardrail must be able to have strength. Effective absorption is designed to design collision energy and block vehicles beyond the designed collision energy beyond the bridge. It is also suggested that the grade of protection for the guardrail of the super suspension bridge should be of eight grades. Public information shows that the second Wanzhou Yangtze River Bridge is a super large suspension bridge type.

According to the engineer, Class 8 is the highest level of protection. If the standard of Highway Traffic Safety Facilities Design Code is followed, the bus should not fall into the river. But the Second Yangtze River Bridge in Wanzhou was built in 2001, and the design at that time could not meet the current standard. Now we should increase some effective protective measures to avoid two injuries caused by accidents. The engineer said.

In this regard, Tan Danhui, a professor of bridge engineering at Tongji University, told the Beijing News that after the introduction of the new design specifications, it is necessary for the local authorities to assess the actual traffic conditions and serious accidents of bridges, to judge the protection standards of guardrails, and to reinforce the existing hidden dangers or fail to meet the requirements of the protection settings. Supplement.