Overview
Demountable truss floor deck is an innovative construction system combining galvanized steel trusses with concrete to create composite floor slabs. Unlike traditional formwork, these permanent decks eliminate the need for dismantling after concrete pouring, significantly reducing labor costs and construction time. The technology originated in Europe and has gained global adoption due to its efficiency in mid-to-high-rise buildings. Modern versions incorporate precision-engineered steel webs and chords that provide both structural support during construction and reinforcement in the finished floor system.
Structure and Working Principle
The system consists of three main components: top and bottom galvanized steel chords connected by diagonal steel webs, forming a triangular truss pattern. These are factory-welded to a profiled steel deck that serves as permanent formwork. When concrete is poured, the trusses bond mechanically with the hardening concrete, creating a composite structural element. The steel deck provides tensile strength while the concrete resists compression forces. This synergy allows spans of up to 4.5 meters without intermediate supports, depending on design specifications.
Key Features
Prefabrication ensures dimensional accuracy with tolerances under ±3mm, enabling faster on-site assembly compared to traditional methods. The open-web design accommodates MEP installations without additional penetrations. Weight savings of 30-40% over solid slabs reduce foundation loads. The system achieves fire ratings up to 120 minutes without additional protection and provides inherent vibration control. Some variants include acoustic damping layers for multi-story residential applications.
Application Areas
Primarily used in commercial offices, retail spaces, and light industrial buildings where rapid construction is prioritized. The system is ideal for projects requiring long spans such as open-plan offices or parking structures. In residential construction, it's favored for apartment buildings and hotels where floor-to-floor height minimization is critical. Specialized versions with enhanced fire performance are used in healthcare and education facilities.
Maintenance and Precautions
Requires minimal maintenance post-installation. Regular inspections should check for concrete cracks exceeding 0.3mm width or any signs of corrosion at cut edges. During installation, temporary supports must remain until concrete reaches 75% design strength. Workers should avoid point loading during concrete placement. All cutting should use cold methods to preserve galvanization integrity.
B2B Procurement Guide
Lead times typically range 4-6 weeks for custom orders. Bulk purchases (500+ sqm) may qualify for 8-12% discounts. Verify manufacturer certifications for local building codes compliance. Key specifications to confirm: deck gauge (0.8-1.2mm common), truss height (80-200mm), and concrete cover requirements. Request third-party load test reports. For export, confirm whether pre-galvanized or post-galvanized treatment was used.
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