摘要
太原市北中环涧河路立交分南、北两幅,上跨铁路处分别为(54+57)m、(67+67)m连续刚构桥,其中箱形T构按全预应力构件设计,以墩底同步转体方式施工,转体重量超万吨。转体结构由下转盘、球铰钢销轴、上转盘、撑脚、钢板滑道、千斤顶反力座等构成。在下承台施工时预埋转体结构的牵引力座、反力座、滑道支架等的钢筋和钢构件,分3次浇筑下转盘混凝土,吊装并精确定位上球铰;采用定型钢模板、塔吊施工主墩;双幅T构平行铁路线同步预制,通过竖向预应力完成T构墩台锚固、墩梁锚固;对T构进行不平衡力矩测试,经配重、试转后,双幅T构均采用2台QDCL200型穿心式连续提升千斤顶同步转体,转体到位后进行后浇段和球铰封固作业。
The Jianhe Road Interchange on the northen Central Ring Road in Taiyuan consists of the left and right bridges,the parts of which crossing railways are the（54＋57）m and（67＋67）m continuous rigid frame structures.The box-shaped T frames are designed in accordance with the criteria of full-prestressing components.The two T frames were constructed in parallel from the pier base by rotation construction method and the parts rotated weigh more than ten thousand tons.The rotating structure is formed of the lower rotating disk,the steel pivots of the spherical hinge,upper rotating disk,supporting stands,steel plate slides and the reaction frame of the jack.During the construction of the lower pile caps,the reinforcement and the steel components of the traction frame,reaction frame,the supporting frame of the slides of rotating structure should be embedded.The concrete in the lower rotating disk was cast by three times and the spherical hinge was installed and positioned with precision.The main piers were constructed using the steel formwork and lifting towers.The twin T frames bearing railways were prefabricated synchronously,and were anchored to the piers by vertical prestressing tendons,and the piers were anchored to the pile caps also by vertical prestressing tendons.Tested by unbalanced forces,the twin T frames were rotated synchronously by two QDCL200 center hole continuous lifting jacks after being counterweighted and experiencing trial rotation.And when the T frames were rotated into position,the construction of the post-cast sections and sealing of the spherical hinges began.
出处
《世界桥梁》
北大核心
2016年第1期25-29,共5页
World Bridges
关键词
连续刚构桥
T构
预制
转体结构
钢球铰
转体施工
不平衡力矩
施工技术
continuous rigid frame bridge
T frame
prefabrication
rotating structure
steel spherical hinge
rotation construction
unbalanced moment
construction technique
