Bongshai Engineering & Construction is a premier contractor in pre-engineered steel buildings (PEB) and heavy structural steel erection. Operating state-of-the-art CNC submerged arc welding (SAW) lines, automatic H-beam assembly machines, and high-capacity mobile cranes, we deliver earthquake-resistant, high-wind load clear-span structures for industrial manufacturing plants, logistics hubs, and commercial high-rises.
Tapered built-up primary rigid frames engineered for spans exceeding 60 meters without intermediate columns, optimizing interior floor space for manufacturing and assembly operations.
Multi-story commercial steel frames utilizing heavy hot-rolled H-columns, metal deck composite concrete slab flooring, shear stud connections, and seismic bracing.
Integrated crane bracket systems, heavy crane runway girders, and rail alignment designed for 10-Ton to 50-Ton overhead Electric Overhead Traveling (EOT) cranes.
Heavy floor load distribution sheds, automated rack supported storage building framing, dock leveler pits, and wide canopy overhangs for all-weather loading.
0.47mm AZ150 Galvalume standing seam metal roof sheets, Polyurethane (PU) sandwich panels, Rockwool insulation, and polycarbonate skylight ridge monitors.
Latticed structural steel pipe bridges for process plants, chemical refineries, electrical utility substation structures, and lattice telecommunication towers.
| Feature Parameter | Bongshai PEB Steel System | Conventional Concrete (RCC) |
|---|---|---|
| Execution Speed | 50% Faster Setup (Factory Prefabricated) | Slower (Requires In-situ Curing Time) |
| Clear-Span Capability | Up to 75m Unobstructed Clear-Span | Limited (Requires Frequent Columns) |
| Seismic Resistance | High Ductility & Light Self-Weight | Heavy Dead Load (Increased Lateral Forces) |
| Building Code Standard | AISC 360, MBMA 2010, AWS D1.1 | BNBC 2020 / ACI 318-19 |
Successfully engineered, fabricated, and erected over 120,000 sq. ft. of heavy industrial clear-span PEB factory buildings and grain silo handling structures. Included 25-Ton crane gantry girders, mezzanine decking, and insulated galvalume roofing systems.
Primary built-up rigid frames utilize high-yield ASTM A572 Grade 50 (345 MPa) steel plates. Cold-formed secondary purlins and girts utilize ASTM A653 Grade 50 galvanized steel.
All factory welds undergo Ultrasonic Testing (UT) or Magnetic Particle Testing (MPT) per AWS D1.1 standards. Field connections utilize ASTM A325 high-strength structural bolts torqued to specified values using calibrated torque wrenches.
