A longitudinal energy absorption structure that absorbs collision energy through self deformation or vehicle climbing, thereby changing the driving direction of the vehicle, preventing the vehicle from crossing the road or entering the opposite lane, and minimizing the injury to passengers. According to its longitudinal setting position in the highway, it can be divided into subgrade guardrail and bridge guardrail; According to its horizontal setting position in the highway, it can be divided into roadside guardrail and median barrier; According to the deformation degree after collision, it can be divided into rigid guardrail and semi-rigid guardrail And flexibility 。
classification
1. Subgrade guardrail: 。
2. Bridge guardrail "refers to the guardrail set on the bridge. The longitudinal load-bearing members in the bridge guardrail can effectively prevent the runaway vehicle from crossing the bridge. According to the size of the collision load it bears, it can be divided into the main longitudinal effective members (such as the main beam) and the secondary longitudinal effective members (such as the secondary beam). The longitudinal non load-bearing members bearing the vehicle collision load are not considered in the bridge guardrail.
3. Roadside guardrail: guardrail set outside the roadside building gauge of the highway to prevent runaway vehicles from crossing the road or colliding with roadside structures and other facilities.
4. Median barrier: a barrier set in the median of a highway to prevent runaway vehicles from crossing the median and running into the opposite lane, and to protect the structures in the median.
5. Rigid guardrail: a kind of guardrail structure that basically does not deform. Concrete guardrail is its main representative type. It is a wall structure composed of concrete blocks of a certain shape connected with each other. It absorbs collision energy by climbing and turning after a runaway vehicle collides.
6. Semi-rigid : A continuous beam column guardrail structure with certain strength and stiffness. Corrugated beam guardrail is its main representative type. It consists of corrugated steel plates and columns spliced together to form a continuous beam column structure. The deformation of soil foundation, columns and corrugated steel plates is used to absorb collision energy and force the out of control vehicle to change direction.
7. Flexible guardrail: a flexible guardrail structure with large buffer capacity. Cable guardrail is its main representative type. It consists of several cables with initial tension fixed on the end post to form a steel cable structure. It mainly relies on the tensile stress of cables to resist the collision load of vehicles and absorb collision energy.
8. Temporary guardrail: site planning, road isolation, channel management and route guidance for large-scale celebrations, large-scale exhibitions and conferences, large-scale sports games and temporary activities.
9. Movable guardrail:
① Movable guardrails must be set at the opening of the median of the expressway.
② For Class I highway with median, movable guardrails shall be set at the opening of the median where vehicles are prohibited from turning around.
③ Movable guardrails shall be set at the center line of the road at the opening of the median, and the set length shall be able to effectively close the opening of the median.
④ The setting height of movable guardrail shall be consistent with that of median guardrail. Delineators or reflectors shall be set on the upper part of movable guardrails. When setting the reflector, the specification is 4cm x 18cm, which can be made of reflector or reflective film. The reflective grade should be above Grade II, and the color and setting height should be consistent with the delineator of the central divider.
⑤ Anti dazzle facilities should be set on the movable guardrail of the road section with anti dazzle requirements.
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