Steel structure bridge

Introduction

Steel structure bridge is a bridge structure mainly made of steel as the load-bearing material, prefabricated components through welding, bolts or riveting processes, and assembled on site. Its core features include factory prefabrication, high strength and lightweight, as well as fast assembly and other modern engineering characteristics. It is suitable for all bridge types such as beam bridges, arch bridges, cable-stayed bridges, suspension bridges, etc. It is an important bridge form that breaks through terrain limitations and achieves green construction.

The bridge in the above picture is a field installation photo of our company's Ivory Coast project, which adopts prefabricated steel structure modular installation. At the same time, customized steel structure bridges have many advantages.

1.High strength and lightweight

Q345qD/Q420qD specialized bridge steel is used, with a yield strength of over 420MPa, which reduces weight by 30% -50% compared to concrete structures and lowers foundation costs by 20%.

2.Rapid construction

Modular prefabrication (factory completion rate of 85%), on-site bolt connection, and single span 200 meter bridge erection cycle can be shortened to 7 days (traditional process requires 30 days), reducing traffic impact by 70%.

3.Ultra large span capability

The double width steel box girder structure achieves a pier free design with a main span of 300 meters, and the orthogonal steel bridge deck system has a bearing capacity of HL-93 standard (American standard), which is suitable for complex terrain requirements.

4.Excellent durability

Triple anti-corrosion system: hot spray aluminum (150 μ m)+epoxy mica iron (200 μ m)+fluorocarbon topcoat (50 μ m), with a lifespan of ≥ 50 years

Fatigue performance: No cracks after 2 million cycles of load (EN 1993-2 certification)

5.Intelligent monitoring integration

Pre embedded fiber optic sensors for real-time monitoring of stress/deformation, BIM+GIS digital twin platform for full lifecycle management, reducing operation and maintenance costs by 40%.

6.Green and low-carbon

The material recycling rate is 100%, and the carbon emissions are reduced by 60% compared to concrete bridges

Photovoltaic barrier system optional (annual power generation of 120kWh/m)

• Material: S355 

• Bridge size: The total length is 81.2 meters, the width is 34.7 meters, and the longitudi nal plane is on a straight line. The transverse slope of the bridge is 2.5%. Due to the us e of prefabricated I-beam steel beams. The bridge is designed with a vertical curve (see T509_SVB-ST_31), with a maximum arch height of 85mm. 

• Welding Material

• Coating System

•  All coatings in this project shall comply with the Technical Conditions for Anti corrosi on Coating of Highway Bridge Steel Structures (JT/T 722-2008), and the service life of the anti-corrosion system shall not be less than 25 years. The painting system is shown in the following table:

Certificate