Overview
Truss decking plate is a prefabricated composite panel system consisting of galvanized steel trusses welded to a corrugated steel sheet, later filled with concrete on-site. It serves as a permanent formwork, eliminating the need for traditional shuttering and reducing labor costs. Developed as an alternative to conventional reinforced concrete slabs, it is particularly favored in large-span structures like warehouses, parking garages, and high-rise buildings. First introduced in Europe in the 1990s, this technology gained global adoption due to its ability to shorten construction timelines by up to 40%. The design allows for seamless integration with mechanical, electrical, and plumbing (MEP) systems, as conduits can be pre-installed within the truss voids before concrete pouring.
Structure and Working Principle
The core component is a triangular steel truss made from cold-formed chord wires (typically 8–12 mm diameter) and diagonal web members, robotically welded to a profiled steel deck (0.8–1.5 mm thick). This assembly acts as both reinforcement and support for the wet concrete until curing. The truss geometry distributes loads efficiently, enabling spans of 3–6 meters without intermediate supports. During installation, panels are placed on steel beams and temporarily braced. After concrete hardening, the composite action between steel and concrete provides the final structural strength. The bottom steel sheet often remains exposed as a finished ceiling surface, saving additional cladding costs. Some variants incorporate acoustic insulation layers or fireproofing materials within the assembly.
Key Features
Weight efficiency is a standout advantage, with typical dead loads of 2.5–3.5 kN/m² compared to 5+ kN/m² for traditional slabs. This reduces foundation requirements and seismic mass. The open-web design allows easy passage of HVAC ducts and pipes without costly penetrations. Quality control is enhanced through factory production of trusses, minimizing on-site variability. Most systems achieve fire ratings of 60–120 minutes without additional protection due to the concrete cover over steel elements. Anti-slip textures on the decking surface improve worker safety during construction.
Application Areas
Commercial high-rises benefit from rapid floor-by-floor assembly, with cycle times as fast as 3 days per level. Industrial facilities utilize its long-span capability for column-free spaces up to 15 meters when combined with post-tensioning. Residential projects value the vibration-damping performance and smooth soffit finish. Specialized applications include data centers (for cable management voids), hospitals (integrated radiant heating), and retrofit projects where lightweight additions are required. In seismic zones, the ductile steel-concrete composite behavior provides superior earthquake resistance compared to conventional systems.
Maintenance and Precautions
Long-term durability depends on proper galvanizing (minimum 275 g/m² zinc coating) and concrete cover (≥25 mm over trusses). In coastal or de-icing salt environments, epoxy-coated rebar or stainless steel components may be specified. During installation, temporary propping must remain for at least 7 days until concrete reaches 75% design strength. Cutting or welding on-site requires manufacturer approval to avoid compromising the truss integrity. Regular inspections should check for delamination signs in high-moisture areas, though properly installed systems typically match the 50+ year lifespan of conventional construction.
B2B Procurement Guide
Major manufacturers include Hailuo, Zhongjie, and international brands like Sommers and Canam. Bulk orders (10,000+ m²) often qualify for 8–15% project discounts. Lead times average 4–6 weeks, requiring early RFQs during design development. Key specifications to verify: truss wire grade (minimum Q235B steel), deck thickness tolerance (±0.1 mm), and concrete compatibility test reports. Some suppliers offer BIM models for clash detection. For export contracts, confirm compliance with target market standards (e.g., EN 1994-1-2 in EU, GB/T 1499 in China). Consider modular coordination – standard widths are 576/600/1000 mm to minimize cutting waste.
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