What is the distance between the columns of the highway guardrail?
The installation height of the fence net is also an aspect related to the safety of use; the height of the column of the highway fence basically determines the installation height of the isolation facility. This index is an important parameter in the design of the fence net, and its value height directly affects the cost. and use effects. The main factors to consider when selecting the height of the fence are the density of people and the terrain along the line. For the specification of using cold-formed equilateral channel steel, 6 options are provided for selection under different stress conditions. At the same time, it is stipulated that other suitable section shape steel can also be used under the conditions of strength and stability.
From the perspective of the main force direction of the channel steel column, the selection of specifications should make the channel steel with the larger main moment of inertia (Iy) of the core around the y-y axis. The effective height range specified in the national JTJ074-94 fence net standard is between 1.6~9:39 2015/7/221.8m. The regulation of this value range mainly considers the height of adults, and the main design goal is to prevent overturning. It has been observed that if people want to enter the expressway, they generally destroy the expressway fence, and the damage position is below 1.2m. Although a higher fence can prevent people from crossing over, it cannot prevent people from entering the expressway. What can really regulate people’s behavior is legal awareness and the degree of civilization of the society.
With the development of society and the improvement of people’s legal awareness, the number of people who violate traffic laws will inevitably decline. The design height of double-circle guardrails for expressways in developed countries such as the United Kingdom is also about 1.3 meters. Therefore, the fence should not be set too high. It is recommended that the exposed height of the fence should be 1.2m-1.5m in general areas, and 1.6m in special areas. This height is not easy to climb and saves investment.