... stage set up by our Ring lock system scaffolding for a performance in EXPO 2010 Shanghai ... fastenerStandard, LedgerStandard, Leger, DiagonalForce styleFriction, ShearAxial loadReliabilityFree frame node, diversity, low reliabilityFixed size component, steady structure, ... 7T2.5T2.8TErection efficiency134Wastage rate10%5%2% ConclusionFlexible frame, low reliability, excessive material, huge wastage more ...