Steel Structure Bridge

Category：

Steel Structure Bridge
Browse number：

8
Release time：

2025-03-22 14:18:10
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Detailed Description

1、 Core advantages of Steel Structure bridges

High strength and lightweight

High strength bridge beam steel such as Q345qD and Q420qE is used, with a yield strength of 345-420MPa, which reduces weight by 40% -60% compared to traditional concrete structures and lowers foundation costs.

Typical component: orthotropic steel bridge deck (thickness 14-20mm), with a self weight of only one-third of the concrete bridge deck, suitable for large-span bridges.

Rapid construction and assembly

The prefabrication rate in the factory is ≥ 90%, and on-site bolt connections can shorten the construction period by 50% (such as completing a 500m span bridge in 18 months).

Modular design: The maximum lifting weight of a single segment can reach 3000 tons (such as the steel shell of a deep to medium channel immersed tube tunnel).

Excellent seismic and wind resistance performance

Ductility design: Node plastic rotation angle ≥ 0.03rad (meets JTG/T D64-2015 seismic code);

The critical wind speed for flutter is ≥ 80m/s (verified by wind tunnel tests).

Whole life cycle cost optimization

60% reduction in maintenance costs: hot-dip galvanizing+fluorocarbon coating (50 year maintenance free);

The recyclability rate is ≥ 95%, and the carbon emissions are reduced by 45% compared to concrete bridges.

2、 Core product series and technical parameters

product type	Specifications and materials	Key technical indicators	Applicable bridge types
Steel box girder	Q345qD， Single box, single room section, width 12-40m	Anti torsion stiffness ≥ 1.5 × 10 ^ 6 kN · m ²/rad	Cable stayed bridge, suspension bridge
Steel truss	Q420qE， Triangle/Warren style truss, with a section length of 12-18m	Node plate bolt hole group positioning accuracy ± 0.5mm	Railway bridge, dual-use bridge for both public and railway
concrete-filled steel tube arch	Φ 1000 × 20mm Q390C steel pipe+C60 micro expansion concrete	Arrow span ratio of 1/4-1/6, bearing capacity ≥ 80000kN	Long span arch bridge
Corrugated steel web beam	1600 type corrugated steel plate (wavelength 1.2m, wave height 220mm)	50% increase in shear bearing capacity and 30% decrease in self weight	Continuous beam bridge, rigid frame bridge
composite beam	Steel beam+precast concrete bridge deck, bolted shear connection	Interface slip ≤ 0.2mm (EN 1994-2 standard)	Urban elevated and overpass bridges

3、 Key Manufacturing Technologies

Intelligent welding process

Double wire submerged arc welding: The weld seam with a thickness of 50mm is formed in one go, with an efficiency increase of 70% and a heat input of ≤ 3kJ/mm;

Robot narrow gap welding: groove angle of 10 °, reducing filler metal by 40% (AWS D1.5 Bridge Specification).

Precision machining technology

3D CNC cutting:

Intersection line cutting accuracy ± 0.5mm (applicable to truss nodes);

The groove angle error is ≤ 0.5 ° (ensuring the quality of full penetration welds).

Thousand ton hydraulic shaping:

Correct the wave deformation of the steel plate, with a flatness of ≤ 2mm/m (GB/T 19879 standard).

Long term anti-corrosion system

Arc spraying aluminum+closed coating:

Aluminum layer thickness of 200 μ m, sealing paint thickness of 80 μ m, salt spray resistance of ≥ 15000 hours;

Stainless steel composite steel plate:

Base Q345qD+cladding 304 stainless steel (thickness ratio 10:1), maintenance free life ≥ 100 years.

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)