Cold-formed steel bridge

Category：

Steel Structure Bridge
Browse number：

10
Release time：

2025-03-31 16:06:55
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Detailed Description

I. Core Advantages of Cold-Formed Steel Bridge

Light weight and high strength performance

Adopting cold-formed thin-walled steel sections (thickness 1.5-6mm), the material utilization rate is increased by 30%, and the deadweight is reduced by 20%-40% compared with hot-rolled steel bridges;

Typical spans: 15-60m (simply supported girders), 80-150m (continuous girders), suitable for small and medium span bridges.

Rapid assembly construction

Factory prefabrication rate ≥95%, on-site bolting or welding, 50% shorter construction period (e.g. 30m span bridge completed in 7 days);

Modular design: maximum lifting weight of single girder ≤ 20 tons (conventional car crane can work).

Excellent seismic and corrosion resistance

Closed section design: high torsional stiffness, better seismic performance than open section;

Galvanized protection: hot dip galvanized layer ≥ 275g/m² (G90 standard), salt spray resistance ≥ 50 years (ISO 1461).

Economic and environmental protection

Comprehensive cost is 15%-30% lower than concrete bridge;

Recyclable rate ≥98%, carbon emission reduced by 40% (compared with traditional Steel Structure).

II. Core Product Series and Technical Parameters

Product Type	Specification and Material	Technical indicators	Applicable Scenarios
Cold-formed C-beam bridge	C300×80×20×3mm Q355B	Single span bearing capacity ≥1,500kN, deflection ≤L/400	Rural highway bridges, pedestrian landscape bridges
Closed-cell box girder bridge	Cold-formed closed box section 200×600×4mm Q420B	Flexural stiffness ≥5×10^4 kN-m², span-to-height ratio ≤25	Urban spans, scenic trestles
Corrugated Web Combination Beam	Wave height 160mm, wavelength 1.2m, top and bottom plate thickness 4-8mm	50% increase in shear load capacity and 30% reduction in deadweight	Medium-span highway bridge
Truss type cold-formed bridge	Triangle truss, chord C-beam, web Z-beam	Strength of node bolting ≥8.8 grade	Temporary emergency bridge, forest transportation bridge
Cold-formed steel pipe arch bridge	Φ300-Φ600×4-8mm Q345B, cold-formed into arcs	Yaw-to-span ratio 1/4-1/5, load capacity ≥8,000kN	Scenic landscape bridge, ecological corridor

III. Key Design and Manufacturing Technologies

Cross-section optimization design

Local stability control: the spacing of stiffening ribs is ≤600mm, preventing the web from buckling;

Combined cross-section innovation: cold-formed steel and concrete combination, bending strength increased by 60%.

Precision cold-formed molding

Roll forming line: continuous roll forming, angle error ≤0.5°, length tolerance ±1mm/10m;

High-frequency welding technology: closed-section weld depth ≥80%, UT flaw qualification rate ≥99%.

Anti-corrosion and connection technology

Multiple alloy coating (ZM): Al-Zn-Mg coating (≥150g/m²), corrosion resistance is 2 times of galvanized;

Self-tapping screw connection: stainless steel self-tapping screws (STS), shear bearing capacity ≥5kN/pc.

IV. Quality testing and certification system

Testing Program	Standards and methods	Qualifying indicators
Cross-sectional geometric accuracy	GB/T 6725-2017	Height deviation ≤±1.5mm, bending angle ≤±0.5°
Weld quality	JG/T 10-2009	UT flaw grade Ⅰ, magnetic particle testing (MT) without cracks
Plating Performance	ASTM A123/A123M-17	Galvanized layer thickness ≥65μm (5-point test method)
Load capacity test	GB/T 50152-2012	No plastic deformation under 1.5 times the design load
Fatigue performance	EN 1993-1-9	No crack expansion after 2 million cycles of loading

Contact

Mobile number: 13848510731

Landline number: 0471-6490861

Address: Inside the courtyard of the Outer Transport Company, diagonally opposite the government of Haoqinying Town, Xincheng District, Hohhot City, Inner Mongolia (National Highway 110)