大跨度抽柱托换改造结构设计  

Structural Design of Large-span Column Extraction Underpinning Transformation

作　　者：梁贻尊 沈最安 LIANG Yizun;SHEN Zuian(Guangzhou Urban Planning Design&Survey Research Institute Co.,Ltd.Guangzhou 510060,China;Guangdong Zuian Construction Engineering Co.,Ltd.Guangzhou 511356,China)

机构地区：[1]广州市城市规划勘测设计研究院有限公司,广州510060 [2]广东最安建筑工程有限公司,广州511356

出　　处：《广东土木与建筑》2024年第10期24-29,共6页Guangdong Architecture Civil Engineering

摘　　要：研究以采用变截面预应力托换梁进行既有建筑打通合并,确保其功能完整性为背景,通过详尽的计算分析与方案比选,确立了一种兼顾经济效益与对原结构影响最小化的技术路径。参考部分国内外案例的应用[1-5],并对实际工程案例进行了改造前后的位移对比分析,以及预应力施加前后的位移对比研究,结果显示:预应力变截面梁技术不仅能实现优异的位移控制性能,而且所需加固构件数量最少。研究揭示,抽柱托换技术的关键在于对竖向位移的有效管控。通过深度细化设计与优化调整[6],成功实现了托换构件系统的简化与效能提升,使得关键节点位移在加固后与加固前状态保持高度一致,进而大幅度减少了加固构件用量与工程成本。工程实例中,采用了分阶段张拉技术以防止应力骤变导致关键构件产生开裂或损伤。针对关键构件与位置,实施了针对性强的检测与监控措施,确保了设计方案的合理性与施工全程的安全性。所探讨的托换技术,为同类工程项目提供了宝贵的实践经验和理论参照。This study is premised on the use of variable cross-section prestressed jacking beams to facilitate the integration of existing buildings while maintaining their functional integrity.Through comprehensive computational analysis and scheme comparison,a technically fea‐sible approach has been established that optimally balances economic efficiency with minimal impact on the original structure.The paper draws upon the application of select domestic and international cases[1-5],presenting a comparative analysis of displacements before and after the renovation,as well as an investigation of displacements prior to and following the imposition of prestress.Results demonstrate that the prestressed variable cross-section beam technology not only exhibits superior displacement control capabilities but also requires the fewest num‐ber of reinforcement components.The research reveals that the crux of the column extraction and replacement technique lies in effective man‐agement of vertical displacements.Through meticulous detailed design and optimization adjustments[6],a simplification and enhancement of the jacking system's performance has been successfully achieved,ensuring that key node displacements remain highly consistent between the pre-and post-reinforcement states,thereby significantly reducing the quantity of reinforcement elements used and overall project costs.In the present engineering case,staged tensioning techniques were employed to prevent sudden stress changes from causing cracking or damage to critical components.Targeted inspection and monitoring measures were implemented for such components and locations,ensuring the rationali‐ty of the design scheme and the safety throughout the construction process.The jacking technology explored herein provides valuable practi‐cal insights and theoretical reference points for analogous engineering projects.

关 键 词：大跨度托换 预应力 施工检测 结构加固 柱托换 

分 类 号：TU318[建筑科学—结构工程]