铁路桥梁桩板结构设计研究  

Research on pile-plate structure design of railway bridge

作　　者：翟培佐 ZHAI Peizuo(China Railway SIYUAN Survey and Design Group Co.,Ltd.,Wuhan 430063)

机构地区：[1]中铁第四勘察设计院集团有限公司桥梁院,武汉430063

出　　处：《铁道勘测与设计》2024年第3期45-50,共6页Railway Survey and Design

摘　　要：为了满足铁路桥梁跨越既有地铁线路的需要,结合现有桩板结构的设计需求,基于Midas建立空间有限元模型,采用m法模拟桩土共同作用,计算了桩板结构在主力、主+附作用下的内力,检算了梁部的强度和挠度,计算了桩长和桩顶截面的强度和裂缝宽度,分析了桩基在施工阶段和运营阶段的裂缝变化和荷载作用的影响。结果表明,桩板结构梁部在主力、主+附作用下,梁部满足A类构件设计要求;桩基承载力、强度和裂缝宽度满足规范设计。顶推力可优化边墩桩基的受力,抵消收缩徐变、预应力次内力、制动力和温度变化对边墩桩基的不利影响。施工阶段合龙顶推施工可按顶推力和强迫位移双重控制。In order to meet the needs of railway bridge crossing the existing subway lines,combined with the design requirements of the existing pile-plate structure,a spatial finite element model was established based on Midas,and the m method was adopted to simulate the interaction of pile-soil.The internal force of the pile and plate structure under the action of main force,main force and additional force was calculated,and the strength and deflection of the beam were calculated.The internal forces of the pile and plate structure under the main force and the main and attached force were calculated,The length of pile foundation,the strength of pile top section and the width of crack were calculated.The change of crack and the influence of load on pile foundation during construction and operation were analyzed.The strength and deflection of the beam part were measured,and the strength and crack width of the pile length and the section of the top of the pile were calculated.The influence of the crack change and load on pile foundation during construction and operation were analyzed.The results show that the beam of the pile-slab structure meets the design requirements of class A members under the action of main force,the main force and additional force.The bearing capacity,strength and crack width of pile foundation meet the standard design.The closure jacking force can optimize the force of edge pier pile foundation,and offset the adverse effects of shrinkage and creep,prestress secondary internal force,braking force and temperature change on edge pier pile foundation.The jacking construction can be controlled by the closure jacking force and forced displacement.

关 键 词：铁路桥梁 桩板结构 桩土共同作用 合龙顶推力 

分 类 号：U44[建筑科学—桥梁与隧道工程]