Once the incident of the Chongqing bus falling into the river was exposed, the masses were in an uproar. After several fermentations, the direction of public opinion also changed. This article is not about value output. The discussion of what is right and what is wrong, how to pursue accountability and other related issues is not the focus of this article, so I will not express it here.
Cutting into this incident from another side, we can find that the guardrail of the bridge may have great potential safety hazards. Judging from the accident video, the bridge guardrail is useless, like paper, without any anti-collision ability. As the basic safety facilities of the road system, the guardrail can make the out-of-control vehicles return to the normal driving direction after colliding with the guardrail, absorb the impact energy to the maximum extent, and reduce the damage to the drivers and passengers if the design is reasonable.
In recent years, a kind of bright and fat barrel guardrail has quietly appeared on the side of some expressways, and there is a rotating anti-collision barrel guardrail. According to public information, this product was successfully developed in 2009 and is a new technology imported from abroad. This guardrail can reduce car accident injuries to a great extent.
This kind of rotating anti-collision bucket is generally made of EVA and polyurethane composite materials, which is elastic, anti-collision and wear-resistant. The rotating barrel acts as a contact medium between the out-of-control vehicle and the guardrail, which can slow down the lateral impact of the out-of-control vehicle. At the same time, these small, fat barrels have strong resilience, and can immediately return to their original shape even if they are severely impacted. In addition, the rotating barrel can rotate around the column under a certain impact, driving the out-of-control vehicle to return to the correct driving direction. Therefore, this guardrail has three basic functions of buffering, anti-collision and guiding.
Rotating anti-collision barrels are mostly used on highways. Many expressways are built in mountainous areas. In the construction of expressways in mountainous areas, there are many high-risk road sections for road testing with “small curve radius, continuous long downhill, continuous detours, and high fill”. The design of ordinary highway guardrails can no longer meet the requirements. Security needs. Therefore, the application of this kind of rotating anti-collision bucket is becoming more and more popular, and it mostly appears in accident-prone areas such as tunnel entrances, central isolation belts, sharp turning areas, and complex intersections.
Of course, during interviews with some transportation facilities manufacturers, we learned that at present, the market share of rotating anti-collision barrels is not very high, and the areas where they are used more are Jiangsu, Zhejiang, Shanghai and Yunnan, Guizhou, and Sichuan. The high cost makes it less competitive, and the traditional wave guardrail is still the mainstream.
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If the cost and other related pain points can be solved, and the popularization and application of this polyurethane rotating anti-collision barrel can be expanded, then people’s travel safety may be more guaranteed.
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Reference: “Analysis of Typical Characteristics of the Safety Performance of Rotating Crash Barriers”; Authors, Chen Guoxing, Zhao Hanxiu, Ding Xudong, Sun Qiaoli
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