超高空间异形钢斜塔施工关键技术

作者：曹利景¹’²’³,巫兴发¹’²’³,田飞¹’²’³

作者简介：

曹利景,工程师,E-mail: 1663643588@ qq. com

作者单位：

1. 中交第二航务工程局有限公司,湖北武汉 430040;2. 长大桥梁建设施工技术交通行业重点实验室,湖北武汉 430040;3. 交通运输行业交通基础设施智能制造技术研发中心,湖北武汉 430040

基金项目：

∗中交集团揭榜挂帅项目:桥梁工业化智能建造关键技术研究与产业化示范(2021-ZJKJ-JBGS01)

摘要：

超高异形钢斜塔施工阶段的位移响应较大,对附墙结构受力产生不利影响;塔式起重机-钢塔联合体系的耦合作用可能削弱整体稳定性,特别是在风荷载或其他横向荷载作用下,更需引起注意。以某独塔双索面斜拉桥为工程背景,采用有限元软件建立塔式起重机-钢塔联合体系模型,研究空间异形钢斜塔塔式起重机附墙结构设计及其与钢塔联合作用下对结构体系受力的影响。研究表明,将常规双塔肢附墙杆改为单塔肢附墙杆,避免了附墙杆较长、受力角度不佳的不利状况,且塔式起重机垂直度满足规范要求;在静风荷载作用下,联合体系对钢塔位移及附墙受力影响不可忽略,其中塔式起重机引起的钢塔位移占比 20% ~ 50%,附墙内力变化在 10%以内。

关键词：桥梁;钢斜塔;塔式起重机;线形;控制;有限元分析

English：

The displacement response of the ultra-high special-shaped steel inclined tower during theconstruction stage is large, which has an adverse effect on the stress of the attached wall structure. Thecoupling effect of the tower crane-steel tower combined system may weaken the overall stability,especially under wind load or other lateral load, which needs more attention. Taking a single towerdouble cable plan cable-stayed bridge as the engineering background, the finite element software is usedto establish the tower crane-steel tower combined system model, and the structural design of the attachedwall to the spatial special-shaped steel inclined tower crane and its influence on the stress of the structuralsystem under the combined action with the steel tower are studied. The research shows that theconventional double-tower-limb attached wall pole is changed to a single-tower-limb attached wall pole,which avoids the unfavorable conditions of long attached wall pole and poor stress angle, and theverticality of tower crane meets the requirements of the code. Under the action of static wind load, theinfluence of the combined system on the displacement of the steel tower and the force of the attached wallcan not be ignored. Among them, the displacement of the steel tower caused by the tower crane accountsfor 20% to 50%, and the internal force of the attached wall changes within 10%.

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