| 轻质砼在大跨度PC桥梁加固中的应用 |
| |
| 引用本文： | 杨琪,李卫民,黄建跃,石雪飞.轻质砼在大跨度PC桥梁加固中的应用[J].中南公路工程,2010(2):14-18,22. |
| |
| 作者姓名： | 杨琪 李卫民 黄建跃 石雪飞 |
| |
| 作者单位： | 广东省佛开高速公路有限公司;广东省交通集团有限公司;同济大学桥梁工程系; |
| |
| 基金项目： | 国家高技术研究发展计划科技项目(国家863计划科技项目,2007AA11Z103); 广东省交通科技项目(2007-17) |
| |
| 摘 要： | 以某大交通、重交通高速公路一座严重下挠和开裂的（65＋100＋65 m）PC连续梁桥为加固工程实例,介绍了桥面铺装采用LC40轻质砼减载和箱梁内增设体外预应力相结合的主动加固方案。分析了轻质砼的加固效果和优越性;阐述了轻质砼配合比设计,主要力学性能指标,施工工艺,质量改善的具体措施。采用轻质砼能大大减少体外预应力束的用量,减少了结构恒载效应,增加了结构承载汽车活载的能力,提高了桥梁结构加固效率。
|
| 关 键 词： | 大跨径PC梁桥 加固 轻质砼 施工工艺 应用 |
The Application on Light-weight Aggregate Concrete Applied to the Strengthening of Long-span PC Bridge |
| |
| YANG Qi,LI Weimin,HUANG Jianyue,SHI Xuefei.The Application on Light-weight Aggregate Concrete Applied to the Strengthening of Long-span PC Bridge[J].Central South Highway Engineering,2010(2):14-18,22. |
| |
| Authors: | YANG Qi LI Weimin HUANG Jianyue SHI Xuefei |
| |
| Institution: | YANG Qi1,LI Weimin2,HUANG Jianyue2,SHI Xuefei3(1.Guangdong Provincial Fokai Expressway Ltd.,Foshan,Guangdong 528051,China,2.Guangdong Provincial Communication Group Ltd.,Guangzhou,Guangdong 510101,3.Department of Bridge Engineering,Tongji University,shanghai 200092,China) |
| |
| Abstract: | Based on an existing pre-stressed concrete girder bridge with the span of 65＋100＋65m,and with severe deflection and cracks under a certain big traffic 、heavy traffic load expressway,reducing load of pavement method by use of light-weight aggregate plus adding external pre-stressing tendons plus is the recommended retrofitting strategy.The strengthening effect on light-weight aggregate concrete is analyzed.The design of mixture ratio、construction workmanship and traffic organization of light-weight aggregate concrete are set forth.Several measures of improving the quality of light-weight aggregate concrete are introduced.By use of light-weight aggregate concrete,it can minimize the quantities of external pre-stressing tendons,reduce the effect of structural dead,enhance the bearing capacity of live vehicle load,and improve the strengthening efficiency of bridge structure. |
| |
| Keywords: | long-span continuous PC girder bridge strengthening light-weight aggregate concrete workmanship application |
| 本文献已被 CNKI 维普 等数据库收录！ |
|
