The following parameters are for refernce only.Specific parameters can be customized according to actual needs.

Highway Gantry Specifications

1.Dimensional Specifications

Beam Span:Typically 8-30 meters for single-span designs,determined by the actual road width (inckding emergency lanes).A safety margin of ≥0.5 meters is reserved to prevent scraping  against vehicles.

Beam Height:The distance fm the lower edge of the beam to the road surface is generally ≥ 5.5 meters on highways,ensuring safe passage for large vehicles such as trucks and buses.

Column Height：The height from the ground to the beam connection point ranges from 8-15 meters,designed based on factors like beam height and foundation depth.

Column Spacing:Matches the beam span,with a tolerance controlled at ≤50mm to ensure beam levelness and balanced load distribution.

Beam Diameter:Circular beams have a diameter ofΦ273mm-Φ630mm;square beams commonly use specifications like 300×300mm.Larger spans require larger beam diameters or cross-sectiona dimensions.

Column Diameter:Circular columns typically have a diameter of Φ325mm-Φ820mm,designed to meet anti-overturning and vertica load-bearing requirements.Some columns adopt a variable cross-section design with a larger diameter at the bottom for enhanced stability.

2.Material Strength

Main Structure Material:Beams and columns are mostly made of Q345 low-alloy high-strength steel,with a yiel strength of ≥ 345MPa.For extra-large gantries, Q420 steel(yield strength ≥ 420MPa) is used to prevent deformation under wind,snow,and other loads.

Connector Material:Flanges,reinforcing ribs,and similar components are generally made of Q235B steel with a thickness of ≥ 20mm,ensuring sufficient strength and toughness.

3.Connecting Component Parameters

Bolt Specifications:Mostly 8.8-grade high-strength galvanized bolts with a diameter of M24-M36,ensuring secure connnections between components.

4.Wind Resistance Performance

Designed to withstand loca 50-year return period wind speed:approximately 30m/s for coasta areas and 25m/s for inland areas,corresponding to a wind load of ≥ 0.6Kn/m².Wind stability is verified through methods like finite element analysis.

5.Anti-corrosion Treatment

Hot-Dip Galvanization:Main structures such as beams and columns undergo hot-dip galvanization,with a zinc coating thickness of ≥85μm.Critical areas like flange edges require a thicker zinc coating (≥100μm).A passivation treatment is applied after galvanization to enhance corrion resistance.

Optional Powder Coating:For highly corrosive environments like coasta areas and industrial zones,an additional powder coating layer(thickness ≥120μm) is added over galvanization.The common color is off-white,providing weather resistance for over 10 years.

6.Other Specifications

Foundation Dimensions:Foundations are usually cast with reinforced concrete,with standard dimensions of ≥2m×2m×3m.Specific designs are adjusted based on geological conditions to effectively resist overturning moments caused by wind loads and structural self-weight.

Installatoin Precision:The beam straightness tolerance is ≤ 1mm/m,column verticality tolerance is ≤ 1mm/m,and the overall beam level deviation after installaton is ≤5mm,ensuring installation accuracy and structural stability.