某高速公路改扩建工程新旧桥梁基础差异沉降分析及控制  

Analysis and Control of Foundation Differential Settlement of New and Old Bridges in a Highway Renovation and Widening Project

作　　者：张齐坤[1] 张广寅 杨立坡[3] 

机构地区：[1]天津铁道职业技术学院,天津300240 [2]天津市市政工程研究院,天津300074 [3]天津市市政工程设计研究院,天津300051

出　　处：《世界桥梁》2015年第2期79-84,共6页World Bridges

摘　　要：为避免高速公路桥梁拓宽工程中,由于新旧桥梁基础差异沉降引起上部结构拼接部位产生开裂,以某高速公路改扩建桥梁加宽工程中后张预应力板梁桥和T梁桥为背景,分析新旧桥梁基础差异沉降对后张板梁桥、T梁桥结构受力、位移的影响,并对结构拼接部位进行强度验算。对采取地基加固(桩底后压浆)技术的后张预应力板梁桥进行13个月的基础沉降观测,验证该控制技术效果。结果表明:新旧桥梁基础差异沉降值为5mm时,桥梁上部结构受力、位移满足要求,拼接部位结构强度满足要求;地基加固技术可有效降低新旧桥梁基础差异沉降。To avoid the cracking in the connecting parts of superstructure caused by foundation differential settlement between the new and old bridges in highway bridge widening project,aposttensioned prestressed concrete slab bridge and a T beam bridge in the bridge widening project that are involved in a highway renovation and widening program were taken as the study background.The influence of foundation differential settlement between new and old bridges on the load bearing behavior of the post-tensioned slab bridge and T beam bridge was analyzed,and strength checking was done for the connecting parts of the structure.Foundation settlement monitoring of 13 months was conducted for the bridge that adopts the foundation strengthening technique（post grouting at the pile base）,aiming to verify the effect of the control technique.The results indicate that when the foundation differential settlement between the new and old bridges is 5mm,the load bearing behavior of the superstructures meets the requirements and the strength of the connecting parts also meets the requirements.The foundation strengthening technique is proved to be effective in reducing the foundation differential settlement between the new and old bridges.

关 键 词：桥梁 改建 加宽 桥梁基础 沉降 地基加固 控制技术 

分 类 号：U445.6[建筑科学—桥梁与隧道工程] U443.17[交通运输工程—道路与铁道工程]