Chongqing bus crash incident: Why did the bridge guardrail not stop?

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 Chongqing bus crash incident: Why did the bridge guardrail not stop?


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According to the Legal Daily on November 1, the Code for Design of Highway Traffic Safety Facilities (JTGD81-2017), which began to be implemented this year, clearly stipulates that bridge guardrails and railings must be installed at all levels of highway bridges; and that central partition barriers must be installed at highways and primary highway bridges as secondary trunk lines. As the main distributing highway, a central divider fence should be set up.

As a city bridge, Wanzhou Second Yangtze River Bridge does not belong to the first-class highway bridge. It is a two-way four-lane bridge, and the four-lane bridge can only have double yellow lines. A bridge and road engineering scholar, who did not want to be named, said.

The second Wanzhou Yangtze River Bridge was opened in 2003, and the Wanzhou Yangtze River Highway Bridge (formerly Wanxian Yangtze River Bridge) 10 kilometers away was completed in 1997, seven years earlier than the second Wanzhou Yangtze River Bridge.

Reporters found on the Wanzhou Yangtze River Bridge, the bridge deck in addition to the outermost guardrail, there is a layer of cement base guardrail between the sidewalk and the roadway height of nearly one meter. According to the scene photos, there is only a row of metal fences about 20 centimeters high on the curb stone between the sidewalk and the roadway of Wanzhou Second Yangtze River Bridge.

The quality of the guardrail between the two bridge walkways and the carriageway is obviously different. Why?

First of all, the Yangtze River Bridge in Wanzhou implements the highway standard, while the Second Yangtze River Bridge in Wanzhou implements the urban bridge standard. They adopt different design specifications and standards, which can not be directly compared. The scholar said.

According to Article 5.0.8 of Design Criteria for Urban Bridges (CJJ11-93) implemented by Wanzhou Second Yangtze River Bridge in that year, the design of pedestrian curb height should be 0.4m. Whether the curb height of Wanzhou Second Yangtze River Bridge reaches 0.4m remains to be verified.

The design criteria for urban bridges (CJJ11-93) stipulates that reinforced rails shall be used outside the bridge. However, there are no specific provisions for the level of collision avoidance. The scholar said.

According to the reporters verification, the latest Code for Design of Urban Bridges (CJJ11-2011) requires that the base of railings should be anchored, and stipulates the anti-collision grade of barriers.

According to the latest Code, the design speed of Wanzhou Second Yangtze River Bridge is 60 km/h, and the grade of guardrail should be at least four (SB). According to the Code for Design of Highway Traffic Safety Facilities (JTGD81-2017), the grade of protection of Wanzhou Second Yangtze River Bridge, as a super-large mother tower suspension bridge, should be eight (HA). Should the second Wanzhou Yangtze River Bridge strictly enforce the existing standards?

The original bridge design can not be examined in accordance with the new specifications issued later. It must be seen in the light of the construction age of the bridge. The scholar told reporters.

But at the same time, he said that after the promulgation of new norms on road traffic safety facilities design, management units should update the corresponding bridge safety protection measures to meet the new norms.

According to the official Wechat Public Number of the Propaganda Department of the Wanzhou District Committee, Weiwanzhou, reported on August 29 this year, in May this year, the original design units and professional inspection agencies of the Second Yangtze River Bridge in Wanzhou pointed out that there were some common diseases in the Second Bridge: aging dehumidification equipment, serious corrosion of sidewalk guardrailings and steel trusses.

On July 12, it was found that pier No. 6 had serious potential safety hazards, and then the maintenance and renovation of the broken road for more than 40 days began. Whether the serious corrosion of the sidewalk guardrail has been solved and whether the anti-collision grade has been improved in the maintenance of the broken lane has to wait for the final investigation results.

Whether the roadside guardrail strength of Wanzhou Second Yangtze River Bridge meets the relevant standards or not is one of the reasons for the bus crash, and it needs to be judged by the professional appraisal agencies in the accident investigation. The scholar said.

Dr. Lei Zheng, School of Administrative Law, Southwest University of Political Science and Law, believes that urban management departments have the responsibility to maintain and manage urban roads, bridges, tunnels and other facilities; safety production supervision and management departments should implement comprehensive supervision and management of safety production within their administrative areas; and transportation departments also have the responsibility to regularly organize hidden danger investigation.

If the investigation results confirm that the defect of the bridge guardrail aggravates the harmfulness of the accident, the relevant departments need to bear the corresponding legal responsibility, and the criminal responsibility should be investigated in accordance with the relevant provisions of the criminal law if the crime is constituted. Lei Zhen told the Legal Daily reporter.

According to the Beijing News, Xu Gongyi, Deputy Engineer of China Railway Bridge Survey and Design Institute, said that the main function of Wanzhou Second Yangtze River Bridge is to serve the urban area, and the speed limit is less than 60 km/h. In fact, it is a system of slow-speed roads, and the design standards of anti-collision barriers will be relatively weak. From the current media reports, the bus is a frontal impact barrier, which is an accidental impact. Another bridge design engineer, who did not want to be named, said that in the Code for Design of Highway Traffic Safety Facilities issued by the Ministry of Transport in 2017, it was suggested that the protective grade of the guardrail of super-large suspension bridges should be eight. Public information shows that the second Wanzhou Yangtze River Bridge is a super large suspension bridge type. According to the above engineers, the level 8 is the highest level of protection, If the standards of the Highway Traffic Safety Facilities Design Code are 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. Source: observer Web Editor: Ji Ke _b6492

According to the Beijing News, Xu Gongyi, Deputy Engineer of China Railway Bridge Survey and Design Institute, said that the main function of Wanzhou Second Yangtze River Bridge is to serve the urban area, and the speed limit is less than 60 km/h. In fact, it is a system of slow-speed roads, and the design standards of anti-collision barriers will be relatively weak. From the current media reports, the bus is a frontal impact barrier, which is an accidental impact.

Another bridge design engineer, who did not want to be named, said that in the Code for Design of Highway Traffic Safety Facilities issued by the Ministry of Transport in 2017, it was suggested that the protective grade of the guardrail of super-large suspension bridges should be eight. Public information shows that the second Wanzhou Yangtze River Bridge is a super large suspension bridge type.

According to the above engineers, the level 8 is the highest level of protection, If the standards of the Highway Traffic Safety Facilities Design Code are 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.