highway guardrail detail

highway guardrail detail introduce

In life, the highway guardrail is mainly used on the highway and bridge. The highway guardrail uses the deformation of the soil foundation, column and beam to absorb the collision energy, and forces the out of control vehicle to change direction, restore to the normal driving direction, prevent the vehicles from out of the road, and protect the vehicles and passengers and reduce the loss caused by the accident.

Comprehensive consideration. When carrying out the design of highway guardrail, we should consider various conditions such as road conditions, traffic conditions and traffic management conditions.

At the same time, the designer should be familiar with the road environment, especially line design, traffic T, traffic safety and road traffic management, the origin of standard specifications, the concept of full life cycle, understanding of the conditions of road construction, use and maintenance, so as to meet the requirements of the guardrail to the maximum and ensure the design. Good.

Suit one's measures to local conditions。 Road design indicators. In particular, the line shape index in the main design, and then according to the traffic volume estimate the vehicle running speed, and then determine the initial collision conditions of the highway guardrail, and the road side conditions, that is, first determine the road side risk, and then select the corresponding level of the highway guardrail detail; accident rate, also according to the existing accident data selection barrier board; and the other.

Coordination of traffic management department. At present, the management of traffic management of urban roads, the determination of speed limit index and the management responsibility of signs and marking lines are in the management department. The management responsibility of the guardrail board is in the road administration department.

Therefore, the designers should also understand the traffic management and consider the phase of the mechanical andelectrical systems such as monitoring and communication in the design of the highway guardrail. Mutual coordination and so on.

road crash barrier

The protection ability is strong. This means that the structure of the highway guardrail must be compressive. It is not easily broken by vehicles. The traffic volume of the city road is big, once the accident happens.

Economic losses are also large and easy to cause traffic congestion, so the strength of the guardrail can play a protective role, especially in heavy freight cars through a large section, such as the central separator barrier with strong anti-collision ability, can avoid a collision with the vehicle two accidents.

It is easy to repair. After an accident, the repair of the highway guardrail in a short time can reduce the impact on the traffic, avoid or reduce traffic congestion, so it is also very important to maintain a simple and convenient maintenance.

What are the testing standards for zinc plating on w beam highway guardrails?

In order to ensure its anti-corrosion performance, all the components of the highway guardrail will be treated by hot dip galvanizing. In order to ensure its anticorrosion performance, it should be measured from three aspects: the adhesion of galvanized layer, the uniformity of galvanized layer and the adhesion property of galvanized layer. So what are the criteria for testing them?

(1) adhesion of galvanized layer

The adhesion test of galvanized layer adopts hammering method. The test piece is placed horizontally, the hammer head is facing the platform center, the hammer handle and the base plane are vertically down, and the five points are struck parallel to the 4mm interval. By checking the surface state of the zinc layer, whether the zinc layer is stripped and convex is found, and the adhesion is judged. The striking point should be away from the end 10mm of the sample and shall not be struck two times at the same point.

(2) material performance test

The properties of steel mainly refer to mechanical properties, which can be divided into strength, plasticity and impact toughness. Strength performance indicates resistance to plastic deformation and failure of steel, including elastic limit, yield limit, strength limit, fatigue limit and hardness. Plasticity indicates the plastic deformation capacity of steel, including elongation. Area reduction and cold-bending. Impact toughness indicates the resistance of steel to impact load. As the content of various components in the material affects the mechanical properties of the steel, the properties of the raw material include chemical analysis, tensile test and bending test.

(3) test on the adhesion of galvanized layer

The zinc used for dip galvanizing should be 0 zinc or 1 Zinc specified in GB470, zinc content and zinc plating thickness.The test of zinc adhesion can be tested by three antimony chloride or coating thickness gauge.

Three the basic principle of antimony chloride method: because zinc can completely dissolve in the concentrated hydrochloric acid solution of three antimony chloride, the amount of zinc adhesion per unit area is calculated by weighing two times before and after dissolving.

w beam guardrail

Galvanizing adhesion of components

The average zinc content (g/m2), the lowest zinc content (g/m2), the average thickness of zinc layer (mm), the minimum thickness of zinc layer (mm).

The guardrail plate, end, column 600425 > 85 > 61

Fastener, resistance block, towing frame 350275 more than 50 or more 39