A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Upper beam body guarantee method for passing without speed limitation during open excavation and underpass of expressway bridge
The invention belongs to the technical field of building bridges, and particularly relates to an upper beam body guarantee method for non-speed-limit passing during open excavation and underpass of an expressway bridge, which specifically comprises the following steps of: arranging self-locking jacks in a temporary bracket between three supporting piles at each end and an underpinning beam, arranging three positions at each end, arranging six positions in one span, jacking upwards through the jacks, and carrying out underpinning on the underpinning beam through the self-locking jacks; the load on the upper portion of the bridge is gradually loaded to the underpinning beam, finally, the original bridge pile withdraws when the axial stress is zero, so that the underpinning pile replaces the original pile to bear the stress, the PLC system is used for jacking and controlling the existing bridge, the action mechanism and the implementation scheme of arranging the jacks on the steel box beam are provided, the safety of the structure is better guaranteed, and the construction cost is reduced. The construction process is subjected to numerical simulation by applying Midas NX finite element software, and an optimization scheme of reducing the number of the cross braces, increasing the distance, reducing the thickness of the continuous wall and reducing the diameter of the cast-in-situ bored pile is provided by combining field collected data and adopting a sensitivity analysis method.
本发明属于建筑桥梁技术领域，尤其是明挖下穿高速公路桥时不限速通行的上部梁体保障方法，其方法具体为：将临时支架中的自锁式千斤顶布置于每端3个支撑桩和托换梁之间，每端设置3处，一跨共6处，通过千斤顶向上顶升，桥梁上部的荷载将逐渐加载到托换梁上，最终原桥桩轴向受力为0退出工作，从而实现托换桩代替原桩柱受力，本发明利用PLC系统顶升并控制既有桥，提出钢箱梁上布置千斤顶的作用机理及实施方案，更有利于保障结构的安全，并运用Midas NX有限元软件对施工过程进行数值模拟，结合现场采集数据，采用敏感性分析方法，提出了将横撑数量减少、间距增大、连续墙厚度减小、钻孔灌注桩直径减小的优化方案。
Upper beam body guarantee method for passing without speed limitation during open excavation and underpass of expressway bridge
The invention belongs to the technical field of building bridges, and particularly relates to an upper beam body guarantee method for non-speed-limit passing during open excavation and underpass of an expressway bridge, which specifically comprises the following steps of: arranging self-locking jacks in a temporary bracket between three supporting piles at each end and an underpinning beam, arranging three positions at each end, arranging six positions in one span, jacking upwards through the jacks, and carrying out underpinning on the underpinning beam through the self-locking jacks; the load on the upper portion of the bridge is gradually loaded to the underpinning beam, finally, the original bridge pile withdraws when the axial stress is zero, so that the underpinning pile replaces the original pile to bear the stress, the PLC system is used for jacking and controlling the existing bridge, the action mechanism and the implementation scheme of arranging the jacks on the steel box beam are provided, the safety of the structure is better guaranteed, and the construction cost is reduced. The construction process is subjected to numerical simulation by applying Midas NX finite element software, and an optimization scheme of reducing the number of the cross braces, increasing the distance, reducing the thickness of the continuous wall and reducing the diameter of the cast-in-situ bored pile is provided by combining field collected data and adopting a sensitivity analysis method.
本发明属于建筑桥梁技术领域，尤其是明挖下穿高速公路桥时不限速通行的上部梁体保障方法，其方法具体为：将临时支架中的自锁式千斤顶布置于每端3个支撑桩和托换梁之间，每端设置3处，一跨共6处，通过千斤顶向上顶升，桥梁上部的荷载将逐渐加载到托换梁上，最终原桥桩轴向受力为0退出工作，从而实现托换桩代替原桩柱受力，本发明利用PLC系统顶升并控制既有桥，提出钢箱梁上布置千斤顶的作用机理及实施方案，更有利于保障结构的安全，并运用Midas NX有限元软件对施工过程进行数值模拟，结合现场采集数据，采用敏感性分析方法，提出了将横撑数量减少、间距增大、连续墙厚度减小、钻孔灌注桩直径减小的优化方案。
Upper beam body guarantee method for passing without speed limitation during open excavation and underpass of expressway bridge
明挖下穿高速公路桥时不限速通行的上部梁体保障方法
LI XIAOZHONG (author) / TENG XUQIU (author) / ZHANG YONGLIANG (author) / LU HONGQIANG (author) / MOU JING (author) / GUO CHUNQIANG (author) / LI BO (author) / JIN XUEJUN (author) / HU LIANGHONG (author)
2023-08-25
Patent
Electronic Resource
Chinese
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