highway guardrail llc nc

highway guardrail llc nc

With the pace of reform and opening up, the rapid development of urban traffic has added a lot of beautiful landscapes to urban construction, but there are also a variety of problems, such as traffic accidents, traffic congestion, exhaust pollution and so on. In the improvement of urban road traffic, the improvement and rational utilization of highway guardrail llc nc play an important role. This paper mainly describes the problems related to the design of urban highway guardrail llc nc in China.

The research status of highway guardrail llc nc in China: the research on traffic safety facilities started late in China. In 1980s, a wide range of research was carried out and the technical specifications of Europe and the United States were used for reference. According to the actual situation of the road in China, some standards and standards on safety facilities have been introduced. By analyzing and studying the advanced design concepts, technologies and specifications of overseas wave guardrail, the design idea and application of people-oriented and landscaping are advocated.

However, due to the limited investment and energy of the road traffic safety facilities in China, and the late start of the research, the existing defects in the construction process of traffic safety facilities are lack of effective evaluation criteria.

At the same time, the technical requirements and the selection principles of the facilities can not be put forward clearly in the design of the safety facilities, and there is also a lack of strict standard in the production and installation. Although the road construction in China is close to the level of the developed countries, the supporting traffic safety facilities are not up to the speed of the road construction and are still relatively backward. The state does not give full play to the proper role of the road. In order to change this situation, we should establish standard and system of road traffic safety facilities in accordance with the national conditions of our country on the basis of the experience of advanced countries, and speed up the development of traffic safety facilities in our country.

The standard for the design of the highway guardrail llc nc and the technical specification for the traffic safety facilities of the Ministry of transportation of our country stipulates the standard for the design of wave guardrails. The main content of the standard is to refer to the relevant foreign regulations. In fact, the traffic conditions and vehicles in various countries are different, and with the development of economic construction and more and more use of the expressway, the traffic flow is greatly increased, the comparison of heavy vehicles and large cars is increasing, the average speed is increased, and the severity of the accident is also increasing. In view of the specific situation of our country, the study of the process and influence of the vehicle collision wave guardrail is an urgent problem to be solved for the design of the necessary technical data for the design of wave guardrails.

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The full-scale model test and scale model experiment are used to study the response of vehicle impact wave guardrail. The previous research work of this topic has carried out the static compression test of single W beam and the corresponding finite element analysis. But single W beam experiment can not fully reflect the deformation and energy absorption characteristics of all parts of the whole wave guardrail system. It is necessary to carry out the impact test of the wave guardrail system which is closer to the actual situation. Based on the previous research, this paper focuses on the impact characteristics, impact stiffness and energy absorption capacity of the wave guardrail system.

On the basis of the Instron 9250 drop hammer impact test machine, the model experiment system of the rigid wave guardrail system (including W beam, resistance block and column) is designed and realized. Through the experimental system, the impact test of the semi rigid wave guardrail system is carried out, and the deformation characteristics of the parts of the guardrail system under the impact condition are obtained. The deformation energy of W beams and resistance blocks is calculated and their contribution to the energy absorption during the impact process is investigated. The absorption energy of the W beam is about 50% to 65% of the total absorption energy, and the absorption energy of the resistance block is about 15% ~ 25%.

It is known that the highway guardrail llc nc is divided into galvanized guardrail and dipped plastic guardrail. The anticorrosion performance of galvanized guardrail is very superior, and it is used in outdoor conditions for up to thirty years. The protection of galvanized steel plays a decisive role, so the quality of galvanized layer is directly related to the life of high-speed guardrail. What kind of galvanized barrier board is used as a barrier board? We can sample the fence and dip it in the copper sulfate solution, then see the time and degree of replacement of zinc and copper to judge the evenness of the guardrail. Then check the solution for 24 hours and check the degree of zinc in the solution to determine the galvanized volume of the corrugated guardrail.

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