Highway guardrail nets are specialized protective facilities installed on both sides of highways or in the central median, serving as a crucial component of the road traffic safety system. Below is a detailed introduction:

Types and Structures

·Classification by Installation Location:

oCentral Median Guardrail Net: Used to separate opposing traffic lanes and prevent vehicles from crossing into oncoming traffic. Typically constructed with double-layer welded mesh + metal frame structure, with a height of 1.2-1.5 meters and fine mesh openings, such as 50mm×100mm, to prevent debris from falling and affecting vehicles below.

oRoadside Guardrail Net: Installed along the highway boundary to prevent pedestrians and livestock from entering the roadway. Common types include chain-link fence guardrails, frame-type guardrails, and corrugated beam guardrails.

·Classification by Structural Form:

oFlexible Guardrail Net (Chain-Link Type): Made of galvanized or PVC-coated steel wire woven into a diamond-shaped mesh pattern, such as 50mm×50mm. It offers strong impact resistance and can absorb collision forces from small vehicles, making it suitable for sections with gentle slopes and good visibility.

oSemi-Rigid Guardrail Net (Frame Welded Mesh Type): Consists of a rectangular steel tube frame + welded mesh panels, combined with round pipe posts and fixed with bolts. It combines rigid support with flexible mesh, providing stable protection, and is commonly used in high-risk areas such as bridges and tunnel entrances/exits.

oRigid Guardrail (Corrugated Beam Guardrail): Made of hot-dip galvanized steel plates pressed into a wave shape and connected to posts via brackets. During collisions, it absorbs energy through deformation and offers strong guidance. It is a common anti-collision facility on highways and is often used in combination with mesh guardrails.

Materials and Specifications

·Materials: The mesh body is typically made of high-quality low-carbon steel wire with a diameter of 3.5-5.0mm, surface-treated with hot-dip galvanizing or PVC coating. The frame and posts use 40mm×40mm-60mm×60mm galvanized square tubes with a wall thickness of 2.0-3.0mm.

·Specifications: Common mesh panel sizes include 1700mm height × 2500mm width and 1800mm height × 2500mm width. Wire diameters range from 2.5mm to 6.0mm, with 3.0mm and 3.2mm being commonly used. Mesh opening sizes vary from 25×75mm to 150×300mm, with 50×100mm and 75×150mm being more common. Posts include specifications such as 48mm×1.0/1.2/1.5/2.0mm thick round tubes and 60×60×3mm square tubes.

Anti-Corrosion Process

A dual-layer protection process of hot-dip galvanizing + electrostatic spraying is commonly used. The zinc layer protects the base material from rust, while the plastic coating, often in colors like dark green or gray, enhances weather resistance, making it suitable for harsh environments such as acid rain and salt fog.

Main Features

·Outstanding Safety Performance: Complies with standards such as the "Design Specifications for Highway Traffic Safety Facilities" and can withstand vehicle collision tests at specified speeds. Central median guardrail nets can also be equipped with anti-glare panels or nets to reduce glare from oncoming headlights.

·Standardized Production and Installation: Components are highly prefabricated, with mesh panel specifications and post spacing adhering to national or industry standards. On-site assembly is quick, resulting in short construction cycles.

·Strong Environmental Adaptability: Mesh height can be adjusted according to terrain fluctuations. In mountainous areas, stepped posts can be used, while coastal regions may employ stainless steel materials or thickened zinc layers to suit different environments.

·Easy Maintenance: Modular structural design allows for individual replacement of damaged mesh panels or posts without the need for full disassembly.

Application Scenarios

·Plain Highways: Chain-link fence guardrails are recommended for both sides, with a height of 1.8-2.0 meters and mesh openings of 50mm×50mm. For central medians, frame welded mesh + anti-glare panels are used, with a height of 1.4 meters and mesh openings of 50mm×100mm.

·Mountainous/Curved Highways: High-risk sections such as cliffs and sharp curves prioritize the use of corrugated beam guardrails + frame mesh combinations. In areas with steep slopes, posts can be spaced more closely to enhance stability.

·Suburban-Urban Interface Sections: Areas with high risks of pedestrians or animals crossing use dense welded mesh + barbed wire to prevent climbing and crossing.