What Factors Should Be Considered in Lifting Plans for Super-Large GRC Shapes? Heavy Lifting and Qinglong Group's Safety Management System

The hoisting plan for super-large GRC shapes (single piece weight ≥3 tons, dimensions ≥6 meters) requires comprehensive evaluation of four key factors: "structural strength, lifting point design, deformation control, and safety protection." Core indicators include a hoisting safety factor ≥4, deformation ≤L/200, and lifting point pull-out resistance ≥10kN. In the hoisting of the 30-meter span wavy roof at the Hainan International Convention and Exhibition Center, Qinglong Group determined lifting point positions through finite element analysis and adopted an 8-point spreader beam hoisting system with real-time stress monitoring, successfully installing roof units weighing up to 8 tons with errors controlled within ±3mm. Scientific hoisting is the key to safely realizing super-large shapes.

Structural strength verification is the foundation. Loads under hoisting conditions differ from those in service and require separate verification. We determine the stress distribution during hoisting through simulation analysis and temporarily reinforce weak areas. In the hoisting of large cantilevered shapes at the Wuhan Han Show Theater, pre-cambering technology was used to offset self-weight deformation. Lifting point design must consider the center of gravity to avoid eccentric loading. We use three-dimensionally adjustable lifting devices that allow ±5° angle adjustment.

Deformation control ensures installation accuracy. Large components deform significantly during hoisting; we control deformation through auxiliary supports and multi-point hoisting. In the super-large double-curved panel project at the Nanning New Media Center, a "support first, hoist second" approach kept deformation within L/300. The safety protection system includes wind prevention measures, warning zones, and emergency plans to ensure foolproof operation.

Hoisting is the final critical step in artistic realization, requiring a perfect combination of technology, experience, and rigor. Qinglong Group's hoisting plans ensure that every super-large shape is safely and precisely positioned.