桥-机耦合效应下连续梁悬臂拼装主动控制技术

作者：王悦¹,曹虹¹,孙九春¹,朱艳²

作者简介：

王悦，技术研发员，助理工程师，E-mail: 834133150@qq. com

作者单位：

1.腾达建设集团股份有限公司，上海 201204;2.盐城市公路事业发展中心，江苏盐城 224000

基金项目：

∗腾达建设集团股份有限公司重点研发课题（2019-SH-010）

摘要：

为满足大跨度连续梁不对称悬臂拼装施工中结构体系的力学状态控制要求，保障施工安全和施工质量，以上海轨道交通 10 号线二期跨越 6 号线节点桥为例，针对连续梁单 T 构悬臂拼装主动控制技术的实际需求，提出基于桥-机耦合效应的 T 构力学状态内部主动控制技术。基于影响线加载原理，通过建立不同施工阶段移动天车荷载下的支点反力影响线力学模型，寻求最有利的移动天车荷载位置；基于超静定体系支点变位原理，通过研究支点变化高度对支点反力的影响关系进行支点反力调整。实践表明，在施工中通过移动天车布载控制及支腿反力调整可有效控制结构体系力学状态在安全范围内。

关键词：桥梁；连续梁；悬臂拼装；影响线；加载；主动控制；支点反力；超静定体系

English：

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.

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