parts of highway guardrail

parts of highway guardrail

parts of highway guardrail can be divided into: 1, wave beam steel guardrail. It has the most extensive application, high safety level, easy maintenance and moderate cost, and is often used on the main road side, central and ramp side. 2, square tube crossbeam guardrail.

It is mainly used for central separation of bridges and snow areas in the north, with high safety level, easy maintenance and high cost, and is often used in northern areas. 3, flexible guardrail. It is mainly used in scenic spots, with moderate safety level, difficult maintenance and moderate cost, and is mainly used for roadside. 4, concrete guardrail. It is mainly used for central separation of service area and ramp, with moderate safety level, difficult maintenance and low cost.

In addition, according to the surface treatment is divided into hot-dip galvanized waveform guardrail and galvanized spraying two kinds. According to the location, it can be divided into roadside guardrail and central partition guardrail. According to the grade of collision avoidance, it can be divided into class A and S. S class guardrail is a reinforced type, suitable for particularly dangerous roadside sections, A class for special highways. According to the anti-collision grade, the common side guardrail of corrugated beam can be divided into five grades: B, A, SB, SA and SS.

parts of highway guardrail is the main form of semi steel guardrail. It is a continuous structure with corrugated steel guardrail plates spliced together and supported by main columns. When vehicles collide, the corrugated steel guardrail has good impact resistance and absorbs energy, and it is not easy to be knocked down, and it can also play a good role in protecting vehicles and personnel.

The guardrail is an important part of the road safety facilities. Its main function is to prevent the vehicle from getting out of the road and through the central separation belt, thus reducing the severity of the accident. In order to prevent the vehicle from getting out of the road or breaking into the direction of the lane, it is necessary to require the guardrail to have enough mechanical strength to resist the collision of the vehicle and protect the personnel from the damage. The structural forms of guardrails mainly include semi rigid guardrails, rigid guardrails and flexible guardrails. Each form has its adaptability. At present, it is widely used as a semi rigid guardrail.

Wave beam guardrail is a common form of semi rigid guardrail. It has a certain stiffness and toughness. It mainly absorbs energy through the deformation of the beam, column and soil foundation. It is easy to replace the damaged part and has a certain line of sight induction. Corrugated beam guardrail is composed of wave guardrail, column, bracket, block, end, fastener and foundation. The material of the barrier plate, column and resistance block are ordinary carbon structural steel.

Application of highway guardrail

The material of the splicing bolt is No. 45 steel, 20TiB steel, nut 35 steel, the washer is flat steel and strip steel, and the connecting bolt is ordinary carbon steel. All parts of the guardrail must be treated with anticorrosion. The testing items of the wave beam guardrail are four parts of appearance quality, geometric shape and size, steel plate material performance and coating quality. The sampling method should be based on sampling standard, and the test method is based on GB700JT/T 281. The quality inspection after installation mainly includes horizontal alignment, various geometric dimensions and strength performance.

The concrete guardrail is a wall guardrail structure with a certain cross-section shape, which belongs to a rigid guardrail. The concrete guardrail is made of cement, gravel, water and steel bar. The concrete guardrail formwork is an indispensable and important tool in the prefabrication process. It directly affects the quality of precast concrete and needs to check the size and quality of the steel formwork. The quality of the concrete base course affects the quality after installation, and the quality of the base should be checked according to the specifications. The appearance quality and geometric size of concrete guardrail must be tested.

parts of highway guardrail

Cable guardrail is a flexible guardrail twisted by wire rope. According to the location, it can be divided into two types: roadside and central separation zone, and embedding conditions can be divided into two types: embedding on the way and in concrete. Concrete foundations are used where the columns can not be penetrated and the embankment filling can not guarantee the depth of the columns. The cable is made of 3X7 galvanized/right-twisted structure with excellent corrosion resistance.

Cable guardrail is composed of end column, middle end column, middle column, bracket, cable anchorage and fastener. It is required to carry out surface anti-corrosion treatment. The quality of cable guardrail should include anticorrosion performance, material performance, geometric dimensions and appearance quality.

In recent years, more and more highway construction, the attendant threat of traffic safety is becoming more and more, so qualified traffic guardrails provide the most basic security for road road.

parts of highway guardrail is mainly used to separate the ascending and descending sequence of vehicles. To prevent vehicles from entering the adverse road and prevent non motorized vehicles and pedestrians from crossing and crossing roads at any time to ensure good traffic order and prevent accidents.

But the high standard of highway guardrail becomes a big problem. If it is too high, the corresponding cost will be very high, but it is too low. It is not advisable for some people to jump over the guardrail and lead to the chaos of traffic order.

When the height of highway guardrail is selected, the main factors are the density of pedestrian flow and the topography along the line. The effective height range of the national JTJ074-94 guardrail standard range is between 1.6~1.8m. This range of values mainly takes into account the height of the adult in order to prevent the turning over as the main design target. It has been observed that if people want to enter the highway, they usually destroy the highway guardrail, and their damage is below 1.2m. Although setting up a high road guardrail can prevent people from turning over, it can not prevent people from entering the highway. It is the legal consciousness and the civilization of the society that can really regulate people's behavior.

w beam guardrail