摘要
针对超高空间异形曲面索塔形状复杂、曲率及尺寸变化大、整体施工及控制过程难度大且智能化控制技术研究较少的问题,以重庆白居寺长江大桥超高空间水滴形索塔为研究背景,对该结构类型索塔精细化及智能化施工控制技术开展研究。首先对索塔施工全过程进行了有限元分析,并且采用三维BIM技术对异形曲面模板设计及制造进行了优化,同时对上塔柱临时横撑的顶推力及拆除顺序进行了分析,并对桥塔应力、线形进行监测,最后提出索塔变形自动化监测方法及塔肢线形和临时横撑轴力智能化控制技术。结果表明:索塔施工全过程,混凝土拉、压应力均未超出规范限值;采用三维BIM技术,优化了异形曲面模板设计及制作工艺,节约了10%~20%的模板制作成本;所提出的倾角仪+全球卫星实时差分定位技术(global navigation satellite system real-time kinematic,GNSS-RTK)融合测量方法与全站仪测量结果最大绝对误差仅1.6 mm,最大相对误差仅5.41%,具有较高的精度;采用塔肢线形和临时横撑轴力智能化控制技术使临时横撑的轴力误差始终控制在10%以内,塔肢的位移误差也控制在5 mm以内,索塔线形控制效果显著,同时当第n层横撑施工后,可通过控制第n-i(i=1,2,…,m)层横撑内力相对恒定来控制塔肢的变形相对稳定;临时横撑最佳拆除顺序应遵循由中间往两端拆除的原则。
For the ultra-high space alien curved cable tower complex shape,curvature and size change,the overall construction and control process is difficult,and less research on the intelligent control technology problems,taking the kind of cable tower refinement and intelligent construction control technology of Chongqing Baijusi Yangtze River Bridge as the research background.Firstly,the finite element analysis of the whole cable tower construction process was conducted,design and manufacture of special surface template were optimized by 3D BIM technology,at the same time,the jacking force and the dismantling sequence of the temporary stull of the upper tower were analyzed,and the stress and linear shape of the bridge tower were monitored.Finally,the automatic monitoring method of tower deformation and intelligent control technology of limb shape and temporary stull axial force were proposed.The results show that in the whole process of cable tower construction,the concrete tensile and compressive stress do not exceed the standard limits.Using 3D BIM technology,optimize the design and production process of the special-shaped curved surface template,saving 10%~20%of the template production cost.The proposed inclinometer+global navigation satellite system real-time kinematic(GNSS-RTK)fusion measurement method has a maximum absolute error of only 1.6 mm and a maximum relative error of only 5.41%with the total station measurement results.The intelligent control technology of tower limb linear shape and temporary stull axial force is adopted to make the axial force error of temporary stull is always controlled within 10%,and the displacement error of the tower limb is also controlled within 5 mm.The cable tower linear shape control effect is significant,when the n-layer temporary stull is constructed,the internal force of the n-i(i=1,2,…,m)layer can be controlled to control the relatively stable deformation of the tower limb.The best removal sequence of temporary stull follow the principle of removal from the middle to bot
作者
李杰
郑建新
杨切
周浩
LI Jie;ZHENG Jian-xin;YANG Qie;ZHOU Hao(CCCC Second Harbor Engineering Company Ltd.,Wuhan 430040,China;Key Laboratory of Large-span Bridge Construction Technology,Wuhan 431400,China;Research and Development Center of Transport Industry of Intelligent Manufacturing Technologies of Transport Infrastructure,Wuhan 431400,China;CCCC Highway Bridge National Engineering Research Centre Co.,Ltd.,Wuhan 431400,China)
出处
《科学技术与工程》
北大核心
2023年第12期5285-5293,共9页
Science Technology and Engineering
基金
国家重点研发计划(2021YFF0500900)。
关键词
斜拉桥
异形索塔
线形控制
BIM
智能化
cable-stayed bridge
special-shaped pylon
linear control
BIM
intelligent
