高速公路砼箱梁步履式顶推过程受力与横向偏位测试
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摘要
以河北某高速公路桥梁工程为研究对象,对其砼箱梁步履式顶推过程受力进行了研究,并对其横向偏位进行了测试。结果表明,该混凝土箱梁横向可以间接地看作是一个连续的梁体系,当其在顶推过程中所受到的力不一致的时候,就会导致支撑高程不平衡,从而导致各个支撑反力存在着相应的差异情况,导致桥梁主体产生横向的扭转使顶推出现不同步,严重地影响了项目工程施工过程中的安全。横向支撑不平衡会严重地导致作用在箱梁局部的应力过于集中,从而产生极大的拉应力,致使箱梁出现裂痕。在进行混凝土箱梁横向多点顶推时,应局部分析产生的横向支撑,确定横向不平容许范围,保证结构安全可靠。在每次顶推循环时,箱梁横向偏移量比较接近;在单次循环中,箱梁横向偏移量基本为正态分布特征。
Taking a highway bridge project in Hebei Province as the research object,this paper studies the force of the walking pushing process of the ballast box girder,and tests its transverse deviation. The results show that the transverse direction of concrete box girder can be regarded as a continuous beam system,and the uneven support elevation will cause some differences in the reaction forces of each support, resulting in the transverse torsion of the beam body, resulting in the unsynchronization of the jacking and affecting the construction safety. Lateral support unevenness will cause local stress concentration of box girder,resulting in greater tensile stress and cracking. In transverse multi-point push-up of concrete box girder,the transverse support produced by local analysis should be determined to ensure the safety and reliability of the structure. In each push-up cycle,the transverse displacement of the box girder is relatively close; in a single cycle, the transverse displacement of the box girder is basically normal distribution characteristics.
Taking a highway bridge project in Hebei Province as the research object,this paper studies the force of the walking pushing process of the ballast box girder,and tests its transverse deviation. The results show that the transverse direction of concrete box girder can be regarded as a continuous beam system,and the uneven support elevation will cause some differences in the reaction forces of each support, resulting in the transverse torsion of the beam body, resulting in the unsynchronization of the jacking and affecting the construction safety. Lateral support unevenness will cause local stress concentration of box girder,resulting in greater tensile stress and cracking. In transverse multi-point push-up of concrete box girder,the transverse support produced by local analysis should be determined to ensure the safety and reliability of the structure. In each push-up cycle,the transverse displacement of the box girder is relatively close; in a single cycle, the transverse displacement of the box girder is basically normal distribution characteristics.
引文
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[11]罗正熠.顶推连续钢箱梁的优化设计[J]. 2016,42(2):177-181.
[2]毛颖.预应力混凝土连续梁大跨径顶推新技术[J].公路交通科技,2014(6):225-227.
[3]玉祥,舒大勇,杨绍斌.九堡大桥步履式平移顶推与传统拖拉式施工对比分析[J].中国港湾建设,2012(2):67-69.
[4]李加才,陈衡.蚌埠淮河公路桥步履式顶推施工关键技术[J].施工技术,2015(4):505-509.
[5]余茂峰,余茂科,叶建龙.钢箱梁步履式多点连续顶推施工关键技术及设计要点探讨[J].公路交通技术,2015(2):99-103.
[6]刘金明.跨高速公路异形钢箱梁步履式顶推施工技术[J].国防交通工程与技术,2017(6):41-46.
[7]张培炎.桥梁顶推施工过程受力分析及关键技术研究[D].成都:西南交通大学,2014.
[8]李涛,软土地区铁路桥梁墩台滑移病害整治技术研究[J].铁道标准设计,2013(11):63-66.
[9]李二伟.桃花峪黄河大桥钢箱梁顶推施工受力分析[J].现代交通技术,2014(2):40-43.
[10]顾乾岗.兰州深安黄河大桥钢拱梁步履式顶推施工技术[J],世界桥梁,2014,42(5):22-26.
[11]罗正熠.顶推连续钢箱梁的优化设计[J]. 2016,42(2):177-181.