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设置道路护栏是为了什么?

  设置道路护栏是为了什么?

  设置道路护栏不是为了减少一般轻微事故的发生。道路护栏的防撞机理是通过道路护栏和车辆的弹塑性变形、摩擦、车体变位来吸收车辆冲击动量,以达到保护乘员安全的目的。道路护栏与其他安全设施的显著区别是以道路护栏和车辆的自身破坏(变形)来防止更严重的伤害发生。

  在设置道路护栏避免车辆与其他危险物碰撞时,也应把道路护栏当成危险物看待。也就是说,如果某一车辆以一定的碰撞条件撞击某一危险物的事故严重度比相同条件下车辆撞击道路护栏的事故严重度小,那么就不能用道路护栏保护该危险物。例如,在某一平缓、低填方的路段,车辆越出路堤的事故严重度比车辆碰撞道路护栏的事故严重度小,即使在此路段发生过许许多多的车辆越出事故,也不能采用道路护栏保护该路段,而应采取其他安全措施,如道路几何线形的改善、设置视线诱导设施、设置限速标志及提高路面抗滑能力等。

  Set up the road barrier is for what?

  Setting the road fence is not to reduce the occurrence of minor accidents. The collision avoidance mechanism of the road barrier is to absorb the impact momentum of the vehicle through the elastic plastic deformation, friction and vehicle body displacement of the road rail and vehicle to achieve the purpose of protecting the safety of passengers. The significant difference between the road and other safety facilities is to prevent the occurrence of more serious damage by the self destruction (deformation) of the road rail and the vehicle.

  In setting the road fence to avoid collisions with other dangerous objects, it should also be regarded as a dangerous road fence. That is to say, if a vehicle collision conditions impact a dangerous accident severity than under the same conditions, the collision of the vehicle road guardrail accident severity is small, it can not be used to protect the dangerous road guardrail. For example, in a flat, low fill road embankment, the vehicle collision accident severity than road guardrail vehicle accident severity is small, even if this section had many vehicles beyond the accident, also cannot use the road fence to protect the road, and other security measures, such as the road geometry the improvement, sight induced facilities, set the speed limit signs and improve the pavement skid resistance etc..

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