顶推钢箱梁的梁段制造构形与无应力线形实现  

Fabrication Configuration and Unstressed Geometry Achievement of Beam Segment of Incrementally Launched Steel Box Girder

作　　者：李传习[1] 周群[1] 董创文[1] LI Chuan-xi, ZHOU Qun, DONG Chuang-wen(Changsha University of Science and Technology, Changsha Hunan 410004, Chin)

机构地区：[1]长沙理工大学,湖南长沙410004

出　　处：《公路交通科技》2018年第5期40-48,共9页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(51378080);湖南省教育厅创新平台开放基金项目(15K010)

摘　　要：针对钢箱梁制造构形确定已有的"矩形法"存在梁段间上下焊缝宽度不一致、"带直角梯形法"存在邻边不等(梁高相等)或梁高不等(邻边长度相等)的不足或缺陷,通过理论分析与数值计算,研究了这些不足或缺陷的影响及这两种方法的适用范围,提出了新的"等高等邻边梯形法"。针对已有的相位变换法以控制点高程为基本变量,采用普通公式表示,编程略显复杂的不足,提出了以梁段两端高差为基本量、采用传递矩阵形式表示的就位标高确定方法。研究结果表明:(1)"带直角梯形法"适应性远大于"矩形法"。对梁高3.5 m的梁段,"以短直代曲"的拼转角超过0.082度时,"矩形法"确定的制造构形相邻梁段间上下焊缝宽度差超容许的5 mm;拼转角超过1.937度时,"带直角梯形法"确定的梁高差或者邻边差超容许的2 mm,均不再合适。(2)"等高等邻边梯形法"对任意梁高、任意转角梁体各梁段制造构形确定均可以使用。不仅适用顶推,而且适用大节段吊装、悬臂拼装等原位拼装的桥梁。(3)以梁段两端高差为基本变量,以传递矩阵形式表示的待拼梁段就位高程确定方法,拓展了相位变换法的表达形式,编程进一步简化,更直观实用。成果在依托工程中应用,顶推施工过程顺利,并取得了良好的实际效果。In focusing on the deficiencies in fabrication configuration of steel box girder,such as inconsistent weld width between top and bottom of beam segment by ＂rectangle method＂,and unequal adjacent edge＇ s lengths（ equal beam＇ s heights） or unequal beam ＇ s heights（ equal adjacent edge ＇ s lengths） using＂right-angled trapezoid method＂,the influence of these deficiencies or defects and the application range of these methods mentioned above are investigated by theoretical analysis and numerical calculation,and a new method called＂ method of trapezoid with equal heights and equal adjacent edge lengths＂is proposed. Aiming at the deficiencies of the previous phase transform method that the elevation of control points is chosen as basic variables and the programming is relatively complex based on general formula representation,the method of in-place elevation determinion by using transfer matrix and the basic variable of height difference between two ends of beam segment is proposed. The research result shows that（ 1） ＂Right-angled trapezoid method＂is more adaptable than ＂rectangle method＂. For beam segment with the height of 3. 5 m,when the assembled angle exceeds 0. 082 degree in ＂short-straight line replacing curve ＂ method,the weld width between adjacent beam segments in fabrication configuration is more than 5 mm allowable value by ＂rectanglemethod＂,and when the angle exceeds 1. 937 degrees,the height difference of the of beam segments or the length difference of adjacent edges are more than 2 mm allowable value using ＂right-angled trapezoid method＂,both methods are not adaptable in these conditions.（ 2） ＂Method of trapezoid with equal heights and equal adjacent edge lengths＂is suitable for determinating each beam segment fabrication configuration with any beam height and any rotation angle,and this method can be applied not only for incrementally launched beams,but also for in-situ assembled bridge such as hoisting large beam segment,cantilever assembling b

关 键 词：桥梁工程 制造构形 传递矩阵法 等高等邻边梯形 无应力线形 钢箱梁 

分 类 号：U441[建筑科学—桥梁与隧道工程]