Steel structure bridge

Steel Structure Bridge: The Paradigm of Modern, Efficient, and Durable Infrastructure Solutions.

In an era demanding rapid, resilient, and sustainable infrastructure development, the steel structure bridge stands as a cornerstone of modern engineering. This product introduction delves into the exceptional characteristics, broad applicability, and significant economic benefits of our advanced steel bridge solutions, designed to meet the complex challenges faced by governments, contractors, and developers worldwide.

Unmatched Product Characteristics & Engineering Excellence.

Our steel structure bridges are not merely structures; they are meticulously engineered systems. We leverage state-of-the-art design software and high-quality materials to deliver products that set new industry benchmarks.

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Product Details

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.

Steel structure bridge

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

Use position	Name	Brand	Specifications	Execution standards	notes
S355B	Submerged Arc Wel ding (SAW) Wire	ISO 14 171-A-S38 2 F B S3	Φ4mm	Welding consumables — Solid wire electrodes, tubular cored elect rodes and electrode/flux combinat ions for submerged arc welding of non alloy and fine grain steels — Classification ISO 14171:2016
	Submerged Arc Weldi ng (SAW) Flux	ISO 14174 - S A F B 1		ISO 14174:2012Welding consumab les — Fluxes for submerged arc wel ding and electroslag welding —Classification
	Solid Welding Wire	ISO 14341-AG424C13Si1	φ 1 . 2 m m	Welding consumables — Wire elect rodes and weld deposits for gas shielded metal arc welding of non alloy and fine grain steels — Classificati on ISO 14341:2010	99 . 99 % CO2

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:

Part	Types of Coatings	Number of lanes	Total Dry Film Thickness (DFT)	Construction site
External surface of the component	Blast Cleaning Sa 2.5	/	Rz = 25–50	Pre treatment coating
	Alcohol-Soluble Inorganic Zinc-Rich Shop Primer	1	20	Pre treatment coating
	Secondary rust removing: Sa2.5 级	/	Rz = 40–70	Factory painting
	Inorganic Zinc-Rich Primer	1	80
	Epoxy Sealer	1	30
	Epoxy Mica Iron Oxide Topcoat	2	2×40
High strength bolt	The coating of high-strength bolts shall be the same as the outer surface of their connection structures, and shall be uniformly coated after construction is completed.
High strength bolt bolted friction surface, upper surface of I-beam flange plate, upper surface of main beam flange, upper surface of bridge deck bottom steel plate lining	Blast Cleaning Sa 2.5	/	Rz = 25–50 μm	/
	Inorganic Zinc Silicate Shop Primer	1	20	/
	Secondary rust removing Sa2.5	/	Rz = 60–100 μm	Factory painting