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850-Meter Continuous Steel Box Girder Highway Bridge in Algiers: Heavy-Duty Urban Mobility and Rapid Modular Erection
Pre-fabricated steel box girders were hoisted in massive segments, drastically reducing on-site welding and minimizing traffic disruption.
Project Overview
Spanning the expansive river basin in the bustling heart of Algiers, this 850-meter continuous steel box girder bridge serves as a vital civic artery. For major municipal infrastructure, city planners face daunting logistical hurdles: prolonged traffic paralysis, structural fatigue from heavy commercial loads, and steel corrosion driven by the Mediterranean climate. Shijie Heavy Industry alleviated these anxieties by delivering a highly functional, non-landmark engineering marvel. We utilized precision-engineered trapezoidal steel box girders, pre-assembled off-site and hoisted into place over robust V-shaped concrete piers. This modular approach drastically minimized urban disruption. Protected by a marine-grade anti-corrosion coating, the bridge guarantees low-maintenance durability. By finishing the erection 45 days early, we provided a seamless transit solution that rapidly eased urban congestion.
| Country | Algeria |
| Application | Urban Highway Bridge |
| Scale | 850 Meters Length, 6 Lanes |
| Structure | Continuous Steel Box Girders |
| Piers | Reinforced Concrete V-Piers |
| Corrosion | C5 Marine-Grade Coating |
| Erection | Segmental Modular Hoisting |
| Load Capacity | Heavy Commercial Rated |
| Traffic Impact | Zero River Blockage |
| Schedule | Finished 45 Days Early |
Accelerated Segmental Erection
Pre-fabricated steel box girders were hoisted in massive segments, drastically reducing on-site welding and minimizing traffic disruption.
Mediterranean Corrosion Shield
A multi-layered marine-grade epoxy system effectively repels coastal air and saline moisture, ensuring a long maintenance-free lifespan.
Exceptional Torsional Rigidity
The aerodynamic trapezoidal box girder design provides superior resistance to stress caused by heavy trucking loads across the six lanes.
Seamless Civic Integration
The sleek profile rests elegantly on robust V-shaped piers, maximizing navigable clearance while avoiding the costs of vanity structures.
Turning Site Challenges into Engineered Certainty
Proven technical interventions to keep your project on spec, on budget, and on schedule
Constructing over an active urban river typically causes severe traffic gridlock and disrupts vital shipping lanes.
Executed precise large-segment modular hoisting during off-peak night windows, ensuring zero stoppage to daytime city traffic.
The humid Mediterranean coastal environment aggressively accelerates the corrosion of exposed structural steel elements.
Applied a rigorous C5-rated heavy industrial anti-corrosion paint system, sealing the girders against moisture penetration.
Managing a river crossing in Algiers is a logistical nightmare. We needed a heavy bridge without paralyzing the city. Shijie understood our priorities, delivering a robust steel box girder system rather than an overpriced landmark. Their modular hoisting was a game-changer, keeping the river open to barges. Precision fabrication meant zero delays for field adjustments. Completing the superstructure 45 days early saved millions in diversion costs. The bridge looks sleek on those V-piers, and the marine coating gives us total confidence. An outstanding partner!
Products Used in Project
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Why Global Contractors Choose SynJect
Predictable delivery, certified compliance, and direct engineering support for zero-risk execution
Pre-assembled in our factory and 3D-nested for containers to cut ocean freight and site delays
Fabricated strictly to CE EN 1090-1, AISC, and ISO 9001 / 14001 / 45001 with full NDT traceability
Work directly with senior structural engineers from Tekla 3D modeling to on-site erection
Frequently Asked Questions
What was delivered for this Algiers river crossing?
An 850-metre, six-lane continuous steel box girder highway bridge through the city, with trapezoidal box girders pre-assembled off site and hoisted onto reinforced concrete V-shaped piers.
How was the city kept moving during construction?
Girders were erected in large pre-fabricated segments during off-peak night windows, so daytime traffic and river navigation carried on. Urban bridge projects fail politically on disruption long before they fail technically.
Why trapezoidal box sections instead of plate girders?
Torsional rigidity. A closed box resists the twisting that heavy commercial traffic on six lanes produces, and the aerodynamic profile handles wind better. The girder also sits lower, which keeps the deck closer to the V-piers and the clearance over the water generous.
What protects the steel in a Mediterranean coastal city?
A multi-layer marine-grade epoxy system rated C5, sealing the girders against saline moisture. Coastal bridges corrode from the inside of the box as well as the outside, so the coating and detailing have to keep moisture out of the section entirely.
Did erecting over the river interrupt shipping?
No. Large-segment hoisting kept the channel clear, and the bridge finished 45 days early – which for municipal infrastructure means earlier relief for the traffic it was built to carry.
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CE EN 1090-1•ISO 9001•ISO 14001•ISO 45001
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