About the author:

1. Tengda Construction Group Co., Ltd., Shanghai 201204,China;2. Yancheng Highway Development Center, Yancheng,Jiangsu 224000,China

Abstract:

In order to meet the mechanical state control requirements of the structural system in theasymmetric cantilever assembly construction of large-span continuous beams, and ensure the constructionsafety and quality, taking the node bridge of the second-phase project of Shanghai Rail Transit Line10 across Line 6 as an example, aiming at the actual needs of the active control technology for the singleT-frame cantilever assembly of continuous beams, an internal active control technology for T-framemechanical state based on the bridge-erection crane coupling effect is proposed. Based on the influenceline loading principle, the most favorable position of the moving crown block load is found by establishingthe mechanical model of the fulcrum bearing influence line under the moving crown block load in differentconstruction stages; Based on the principle of fulcrum displacement of statically indeterminate system, thefulcrum bearing is adjusted by studying the relationship between the fulcrum change height and thefulcrum bearing. The practice shows that the mechanical state of the structural system can be effectivelycontrolled within the safe range through the load distribution control of the movable crown block and theadjustment of the leg reaction force during the construction.