highway guardrail design questioned

highway guardrail design questioned analysis

highway guardrail design questioned is divided into two categories, one is collision guardrail, which is mainly used on highways and has certain protective effect on motor vehicles; the other is case guardrail, which is mainly used on driveway and sidewalk.

The installation height of highway guardrail design questioned network is an important item for people to drive daily, so the height of high-speed guardrail should be set reasonably. The height of the column of the guardrail net basically determines the installation height of the isolation facility.

This index is an important parameter in the design of the guardrail network, and its value height directly affects the cost and the use effect. The main factors considered in the height selection of guardrail network are the density of human flow and the terrain along the line.

Six kinds of selection forms are provided for the specification of cold bending equal side channel steel for 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 point of view of the main force direction of the channel steel column, the selection of the specification should make the main moment of inertia of the core around the y y axis (Iy) larger.

The effective height range specified in the national JTJ074-94 guardrail network standard is between 1.6 m and 1.8 m, which mainly considers the adult height in order to prevent overturning as the main design goal. It is observed that if people want to enter the expressway,

Application of highway guardrail

highway guardrail design questioned usually destroy the highway guardrail design questioned, and the damage position is less than 1.2 m. Although setting up a higher guardrail network can better prevent people from overturning, but can not prevent people from entering the expressway, what can really regulate peopleundefineds behavior is legal consciousness and the degree of social civilization.

With the development of society and the improvement of peopleundefineds legal consciousness, the number of people violating traffic regulations is bound to become a downward trend.

The design height of highway guardrail design questioned network in developed countries such as Britain is also about 1.3 meters. Therefore, the guardrail net should not be set up too high.

highway guardrail design questioned is suggested that the exposed height of the guardrail net should be 1.2m-1.5m in the general area and 1.6m in the special area. This height is not easy to overturn and saves investment. What is the spacing setting for guardrail net columns.

highway guardrail design questioned introduce

As the height of guardrail net column is reduced, highway guardrail design questioned is suggested that the distance between columns should be set at 5m, 201 per kilometer, and 251 per kilometer, that is, 50 columns per kilometer.

highway guardrail jobs

The mesh and spiny wire move frequently around the village and town in the agricultural area, and the wire should be made of metal mesh or steel plate mesh. Therefore, the type net is not harmful to people.

The design should adopt the lower dense (0~60cm high) 10 × 15cm hole and the upper sparse (60~120cm high) isolation network 20 × 30cm hole, which can achieve the purpose of saving materials and cost.

However, because the cost of steel plate mesh is higher than that of metal mesh, and the beauty is a little worse, and the adaptability to complex terrain is weak, the highway built in China is rarely used at present.

There are three kinds of metal mesh: braided net, welding net and flower drawing net. There are two kinds of welding net: coil net and sheet net. Because of its simple installation, high overall strength and strong adaptability to complex terrain (the mesh can be clipped at will).

highway guardrail design questioned should be recommended to use the reel in the general design. In mountainous areas, forest areas, pastoral areas and other sparsely populated areas, highway guardrail design questioned is appropriate to adopt the type of spiny wire because of its low cost.

guardrail highway bridge

The installation foundation of the column is set up, and the steel column and the cement concrete foundation are usually prefabricated together in the installation of the isolated grid column of the highway. In order to make it easy to carry and install the column,

the size of the foundation should be determined according to the geological conditions and the force condition, and its size should not be too large.

highway guardrail design questioned is suggested that the cement concrete precast block of 20 (long) × 20 (wide) × 30 (high) cm should be used in the foundation. A reinforced column can be set up every 30 m in the straight line section, the buried depth of which should be below 50cm, and the oblique brace should be added on both sides.

Guardrail end terminals

Cement concrete precast and wooden columns can be buried directly without foundation, and the embedding depth is about 30~40cm. It is advisable to carry out anticorrosion treatment when the wooden column is buried in the underground part.