High Strength Q345B-Q460C Grade Steel Box Bridge Prefabricated Steel Bridge
| Attribute | Value |
|---|---|
| Product Name | Steel Box-girder bridge |
| Bridge Deck | Concrete |
| Type | Steel Girder Bridges |
| Material | Prefabricated Steel |
| Steel Grade | Q345B-Q460C |
The steel box-girder bridge is a high-strength structural solution composed of top plate (bridge panel), beam web, bottom plate, longitudinal stiffener, transverse stiffener, and diaphragm plate (cross beam).
This hollow, rectangular or trapezoidal-shaped steel box structure provides exceptional strength, stiffness, and durability, making it ideal for long-span applications and heavy load-bearing requirements.
- Top plate, beam web and bottom plate thickness: 12-30mm
- Secondary plate thickness: 10-20mm
- Manufactured in factory fragments (10-30m sections) with site welding
- Orthotropic steel bridge panels with open/closed longitudinal rib sections
Ideal for bridges with width ≤3 lanes or width-to-span ratio
Used when bridge width makes single box impractical due to size, transportation, or installation constraints.
Optimal for small-span, wide bridges with uniformly spaced main beams for even load distribution.
Proper support configuration is critical for stability and load distribution:
- Single-box bridges require two end supports for torque resistance
- Multi-box bridges use one support per steel box
- Temporary fulcrum supports with jacks strengthen during construction
- Lightweight construction with steel savings
- High flexural and torsional stiffness
- Rapid installation and easy maintenance
- Excellent for continuous beam formation
- Aesthetic, streamlined appearance
- Large span capabilities exceeding other bridge types
- Superior wind resistance and stability
- Hollow structure facilitates maintenance access
| Category | Details |
|---|---|
| Bridge Types | Bailey bridge, Modular bridge, Truss Bridge, Warren bridge, Arch bridge, Plate bridge, Beam bridge, Box girder bridge, Suspension bridge, Cable-stayed bridge, Floating bridge |
| Design Spans | 10M to 300M single span |
| Carriage Way | Single lane, Double lanes, Multilane, Walkway |
| Loading Capacity | AASHTO HL93.HS15-44 to HS25-44, BS5400 HA+20HB to HA+30HB, AS5100 Truck-T44, IRC 70R Class A/B, NATO STANAG MLC80/MLC110 |
| Steel Grade | EN10025 S355JR to S460J0, ASTM A572 GR50/GR65, GB1591 GB355B/C/D/460C |
| Certifications | ISO9001, ISO14001, ISO45001, EN1090, CIDB, COC, PVOC, SONCAP |
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