运营期单箱双室箱梁顶板纵向裂缝成因及处治对策研究
Research on the Causes and Treatment Measures of Longitudinal Cracks on the Top Plate of Single-box Double-cell Box Girder in Operation Period
王富颉 1何厚乐 1王灏2
作者信息
- 1. 浙江嘉绍跨江大桥投资发展有限公司 绍兴市 312366
- 2. 中交公路规划设计院有限公司 北京市 100010
- 折叠
摘要
单箱双室箱梁截面能提供更大的桥面宽度,在交通运输不断发展、桥梁通行需求迅猛增长的背景下得到了广泛地应用.桥梁运营过程中,单箱双室箱梁顶板容易出现纵向裂缝病害,对结构技术状况等级和耐久性带来不利影响.结合顶板纵向裂缝现场检查和取芯结果,对裂缝的分布特征和形态特征进行了分析,重点研究了顶板横向预应力钢束的有效度和上浮偏位情况及其对开裂的影响;结合裂缝特征和成因,设计了处治方案并进行了试验应用和效果跟踪观测.研究结果表明,顶板横向预应力上浮将显著降低下缘压应力储备,引起混凝土纵向开裂;针对顶板纵向裂缝,采用高延性防侵蚀涂装方案进行处治可获得良好的效果.
Abstract
Due to its larger deck width,the single-box double-cell box section has been widely used under the background of continuous development of transportation and rapid growth of bridge traffic demand.In the operation phase,the top slab of single-box double-cell box girder is prone to longitudinal cracks,which affects the technical condition and durability of the structure.In this paper,the distribution and morphological characteristics of the cracks are analyzed based on the results of on-site inspection and coring of the longitudinal cracks in the top slab,and then the effectiveness of the transverse prestressed tendons in the top slab,the floating deviation and the impact on the cracking are studied;combined with the characteristics and causes of the cracks,the treatment scheme is designed and the experimental implementation and effect tracking observation are carried out.The results show that the transverse prestress floating of the top slab will significantly reduce the compressive stress reserve of the lower edge and cause the longitudinal cracking of the concrete;for the longitudinal cracks of the top slab,the high ductility anti-corrosion coating scheme can achieve good results.
关键词
桥梁工程/单箱双室箱梁/纵向裂缝/成因分析/处治对策Key words
bridge engineering/single-box double-cell box girder/longitudinal crack/cause analysis/treatment countermeasures引用本文复制引用
出版年
2024
NETL
NSTL
万方数据