The Strengthening Technology about External Prestressing of
Large Span Concrete Bridge

doi:10.3969/j.issn.1674-0696.2011.supp2.018

Journal of Chongqing Jiaotong University(Natural Science) ›› 2011, Vol. 30 ›› Issue (S2): 1192-1196.DOI: 10.3969/j.issn.1674-0696.2011.supp2.018

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The Strengthening Technology about External Prestressing of Large Span Concrete Bridge

XU Hong-yuan ，SONG Ning，CHEN Chang-ming，LIU Shi-lin

CCCC First Highway Consnltants Co.，Ltd.，Xi’an 710075，Shaanxi，China

Received:2011-07-23 Online:2011-12-30 Published:2015-01-22

大跨径混凝土梁桥体外预应力加固技术

许宏元，宋宁，陈常明，刘士林

中交第一公路勘察设计研究院有限公司，中国陕西西安710075

作者简介:许宏元(1965—)，男，教授级高级工程师，院长助理兼院副总工程师，西安瑞通路桥科技有限公司总经理。

Abstract

Abstract: Problems with prestressed long-span concrete bridge in China are beam cracks and time-dependent deflection in midspan，which result in higher cost for bridge maintenance and poor sense of beauty， influence structure durability and traffic safety． External prestressing system adopted for long-span concrete bridge strengthening has obvious effect to control cracks and deflection． Based on the strengthening practice of two bridges with main span of over 200m，This paper puts forward relevant measures and some useful suggestion for external prestressing system．

Key words: long-span concrete bridge, deflection, crack, external prestressing

摘要： 跨中长期下挠和梁体开裂是大跨径混凝土梁桥的常见病害，病害的存在与发展导致桥梁维修养护费用的大幅增加、破坏桥梁美观、严重影响交通和结构安全。采用体外预应力加固技术受力明确、安全，对抑制跨中下挠、控制裂缝，能起到明显的作用。在分析病害特点及成因基础上，通过对两座主跨超过200 m 的刚构桥加固实践的总结，提出了针对性措施和体外预应力体系使用建议，供同行参考。

关键词: 大跨径混凝土梁桥, 跨中下挠, 梁体开裂, 体外预应力

CLC Number:

XU Hong-yuan ，SONG Ning，CHEN Chang-ming，LIU Shi-lin. The Strengthening Technology about External Prestressing of Large Span Concrete Bridge[J]. Journal of Chongqing Jiaotong University(Natural Science), 2011, 30(S2): 1192-1196.

许宏元，宋宁，陈常明，刘士林. 大跨径混凝土梁桥体外预应力加固技术[J]. 重庆交通大学学报（自然科学版）, 2011, 30(S2): 1192-1196.

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The Strengthening Technology about External Prestressing of Large Span Concrete Bridge

大跨径混凝土梁桥体外预应力加固技术

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