土工基础

›› 2012, Vol. 26 ›› Issue (2): 51-53.

• 工程实录 • 上一篇    下一篇

后张法长空心板上拱度偏低原因分析

邬耀生   

  1. （中国一冶集团有限公司交通工程公司,武汉 430080）
  • 收稿日期:2011-06-09 出版日期:2012-04-20 发布日期:2012-04-27
  • 作者简介:邬耀生，中国一冶集团有限公司工程师。

Analysis of Factors Affecting the Convex Rate of  a  Span Post Tensioned Concrete Box Girder

WU Yaosheng   

  1. (Transportation Engineering Co., China First Metallurgical Group Co., Ltd. Wuhan, 430080)
  • Received:2011-06-09 Online:2012-04-20 Published:2012-04-27

摘要： 后张法26 m空心板的混凝土强度、高度、断面尺寸及张拉应力、伸长量均符合设计和规范要求，但实际的空心板上拱度比设计理论上拱度偏低较多，本着对工程质量负责的态度，通过静载试验、提交咨询公司验算、请专家分析，最终找到了26 m空心板上拱度过低的原因，解除了因空心板上拱度过低而担心影响桥梁结构安全的顾虑，为类似空心板施工提供了参考。

关键词: 空心板, 上拱度, 偏差, 原因分析

Abstract:  A 26 meters span post tension concrete box girder meets the design and code requirements on concrete strength, girder height, cross section dimensions, tension stresses and elongation. But the convex rate of the as-built girder was fairly lower than the design value. The asbuilt concrete box girder was loaded tested, independent analyzed and consulted by experts. Factors affecting the rate of the convex were able to be obtained. Finally, bridge safety concerns due to the lower convex rate of this post tensioned concrete box girder were eliminated.

Key words: Concrete Box Girder, Convex Rate, Error Range, Analysis of Factors