Highway traffic safety facilities are an important part of highway engineering, especially for expressways. Crash barriers, as the basic safety facilities on expressways, play an important role in promoting traffic safety on high-grade highways.
W steel beam guardrail is semi-rigid barrier that has both rigidity and flexibility. It is a beam structure fixed by pillars. The crash performance of W steel beam guardrail is achieved by friction between vehicles and guardrails, friction between vehicles and the ground, and some elastic and plastic deformation of vehicles and guardrails themselves, which can absorb collision energy, prolong the collision time, reduce speed, ensure personal safety and reduce vehicle damage.
The setting of W steel beam guardrail varies according to different road conditions and settings. The crash performance requirements of W steel beam guardrail set on the road base are divided into A and S levels according to the crash resistance level. The crash resistance levels of guardrails set in the central divider are Am and Sm, respectively.
W steel beam guardrail plates, pillars, and crash cushions
The steel used for W steel beam guardrail plates, pillars, crash cushions, and connecting bolts (referring to bolts connecting the pillar and the guardrail) is Q235 ordinary carbon structural steel. Its technical conditions should meet the requirements of the "Carbon Structural Graph." The yield point of W steel beam guardrail should not be less than 235MPa, and the tensile strength should be within the range of 375-460 MPa. No cracks should occur under the condition of a bending radius not exceeding 1.5 times.
High-strength bolts, nuts, and washers
High strength bolts (referring to the splicing bolts between guardrails) should be made of 45 steel or 20MnTtB steel, steel yield strength should not be greater than 990MPa, corrugated steel beam guardrail tensile strength should be greater than 1100MPa, elongation should be greater than or equal to 10%, shrinkage rate should be 42%, Rockwell hardness HRC33-99.
Pre-construction inspection: Wave steel beam guardrail construction should be carried out after the completion of the edge stone construction. If it is constructed before the edge stone is completed, an accurate positioning should be done with a theodolite and a level. The related materials of guardrail column, guardrail board, baffle block, connecting panel and end should be inspected and certified for their material, strength and coating quality, and they should be allowed to enter the construction site after the approval of the supervisor engineer.
After the materials are transported , the contractor's quality inspection engineer should carry out self-inspection according to the prescribed frequency, and the highway guardrail should be reported to the supervisor for inspection and verification before it is allowed to be used.
Inspection items for guardrail materials on site include: dimensions and galvanizing quality of guardrail column, guardrail board, baffle block, connecting panel and related materials at the end. The galvanizing thickness of the materials should meet the design requirements, and the zinc coating should be free from peeling, pollution and damage. The adhesion of the zinc coating should be free from cracking and peeling.
Construction formwork inspection: Before formwork inspection, it should be checked whether the highway guardrail posts conflict with the pipeline engineering and drainage engineering, and technical briefing should be done before construction to avoid damaging the pipeline engineering and drainage engineering.
The benchmark line should be fixed to determine the position and depth of the posts. After the formwork is completed, the contractor's quality inspector should check the formwork. After the approval of the supervisor, the construction in the site should be organized.
In the process of formwork inspection, the supervisor's job is to verify whether the formwork in the construction site is correct. The formwork of corrugated steel beam guardrail requires accurate positioning and smooth lines. The positioning error range of posts and road shoulder lines is more than or less than 20mm, and the spacing error range of posts is more than or less than 50mm.
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