强度不达标PC箱梁调整张拉控制应力处治方法  

Adjusting tension control stress treatment scheme of PC box girder with strength not up to standard concrete

作　　者：李秀 朱红兵[2] 许成祥[2] 向杰[2,3] 李成玉 Li Xiu;Zhu Hongbing;Xu Chengxiang;Xiang Jie;Li Chengyu(Wuhan Technical College of Communications,Wuhan 430065,China;School of Urban Construction,Wuhan University of Science and Technology,Wuhan 430065,China;Beijing Midas Technology Co.,Ltd.,Beijing 100044,China)

机构地区：[1]武汉交通职业学院,湖北武汉430065 [2]武汉科技大学城市建设学院,湖北武汉430065 [3]北京迈达斯技术有限公司,北京100044

出　　处：《山西建筑》2020年第15期133-134,共2页Shanxi Architecture

基　　金：湖北省教育厅科学研究计划项目(B2017559)。

摘　　要：针对施工过程中箱梁梁体混凝土强度达不到设计要求但较接近设计值的质量缺陷,提出了粘贴钢板加固、适度调整预应力筋张拉控制应力等两种处治方案,经验算两种方案处治后均能满足相关设计指标要求。采取适度调整预应力筋张拉控制应力的处治措施后,取得了较好的效果,为PC结构中混凝土强度接近设计值的质量缺陷提供了一种可供选择的技术补救方案。In view of the quality defect that the concrete strength of the box girder fails to meet the design requirements but is close to the design value in the construction process,two treatment schemes are put forward,i.e.pasting steel plate for reinforcement,moderately adjusting the tension control stress of the prestressed reinforcement,which can meet the relevant design index requirements after the treatment of the two schemes.Good results have been achieved after the treatment measures of moderate adjustment of prestressed tendon tension control stress have been taken.It provides an alternative technical remedy scheme for the quality defect of concrete strength close to the design value in PC structure.

关 键 词：预应力混凝土梁 混凝土强度 张拉控制应力 质量缺陷 

分 类 号：U445[建筑科学—桥梁与隧道工程]