mass highway guardrail detail

mass highway guardrail detail

The guardrail on the road is very few of us. Maybe we will notice it when we stop and rest. He can say that it is the "Guardian God" on the highway. It is an indispensable part of the highway, which is of great significance. Let's take a look at mass highway guardrail detail.

First of all, there are two kinds of guardrail boards on the market: galvanizing and painting. The installation of guardrail requires 3-7 staff members to be the best and the most efficient. And follow the principle of direction opposite to the direction of driving in installation, so that it is faster and more convenient to operate.

At the same time, the hardness of the galvanized layer is low, easy to be damaged, so in the construction should be extra careful, light to take light, if the damage of the zinc coating is not careful, in 24 hours with high concentration of zinc coating remedies, when serious can be replaced.

Then, when installing the bracket, the bracket is installed on the column first, the fixed bolt does not tighten too tight, then the guardrail is fixed on the bracket with the connecting bolt, and the guardrail and the plate are connected with the splice bolts; if the splice is opposite, even a slight collision will cause greater loss. Therefore, this operator should bear in mind that we should not be careless.

Finally, in the process of installing the guardrail, it is not a good thing to say, but a continuous adjustment. Therefore, the connecting bolts and spelling bolts should not be tightened too early to allow the adjustment to be loosened in the rear; to adjust the line shape in time on the long circular hole on the guardrail to make the line smooth and avoid the local concave and convex, so that all the bolts should be tightened when the top line of the guardrail is satisfied.

To sum up, the description of some details of the construction of the highway guardrail board may not be perfect enough, but the main points are very clear. Although we are not operators, we know that these installation details are very beneficial to us.

highway guardrail requirements

mass highway guardrail detail

The main classification of mass highway guardrail detail, the highway guardrail board can be divided into five grades of B, A, SB, SA and SS according to the collision prevention grade. The highway anticollision guardrail is a typical cold bending steel product. The corrugated beam guardrail is generally classified according to the location and level of collision avoidance. According to the location, they can be divided into roadside guardrail and central divider guardrail. According to the grade of collision avoidance, it can be divided into class A and B. A grade guardrail is an enhanced type. It is suitable for road sections which are especially dangerous. B grade is used for special roads. Industry standard JT/T281 - 2007 "freeway wave beam steel guardrail" hot dip galvanized beam steel guardrail and column: hot galvanized corrosion coating quality galvanized zinc adhesive quantity g/m2 average galvanizing adhesion plate more than 600 column resistance block more than 350 minimum galvanized adhesion plate more than 425 column resistance block more than 275 plating thickness of the thickness of the average coating thickness mu m Thickness plate more than 85 column resistance block more than 50 minimum coating thickness plate more than 61 column resistance block more than 39 hot dip galvanizing + pure polyester electrostatic spraying double coating wave beam steel guardrail and column. The average plating adhesion is g/m2 or more than 270, the average thickness of the column is m, the thickness of the plate is more than 39, the average thickness of the coating is m, the thickness of the column is more than 76.

What is the protection principle of the hot dip galvanizing layer? For a long time, the steel plate has been hot-dip galvanized because the zinc can form a good corrosion resistant film on the surface in the corrosive environment. It not only protects the zinc layer itself, but also protects the steel base.

Therefore, the steel after hot galvanizing has greatly extended the service life. The service life is related to the environment and the environment. Through the atmospheric corrosion test of hot dip galvanized sheet, we can confirm this point.

Chemical corrosion is a direct chemical interaction between metals and surrounding media. For example, dry (absolutely moisture free) gas and non-conductive liquid medium (non electrolytes), the chemical effects on zinc are all called typical chemical corrosion.

Electrochemical corrosion is the corrosion of metals in tidal TA gas and conductive liquid medium (electrolyte) due to the flow of electrons. For example, the corrosion of zinc in acid, alkali, salt solution and seawater and the atmospheric corrosion of zinc in moist air are all electrochemical corrosion.

w beam guardrail

When the moisture in the air is deposited on the pits on the surface of the galvanized sheet, and the carbon dioxide, sulfur dioxide, or other corrosive media in the air are dissolved in the water, the electrolyte is formed. In this way, a micro battery is formed. The standard electrode potential of the medium.