中国大跨径混凝土梁桥典型病害剖析及防治技术简介

预应力混凝土梁桥以其结构刚度好、行车平顺、养护简单等一系列优点而备受工程界欢迎。然而近年来,大跨径预应力混凝土梁桥在施工过程或使用阶段,普遍出现各种不同性质的病害,最常见的病害为箱梁开裂和结构长期下挠;这些病害对桥梁的耐久性和营运的安全性构成了威胁,甚至在一定程度上阻碍、制约了大跨径预应力混凝土梁桥的发展。针对既有大跨径预应力混凝土梁桥的病害,病害成因分析、对桥梁损伤的诊断、损伤桥梁的修复加固方法是该类桥梁应用中亟待解决的问题。本文首先阐述我国现有大跨径梁桥的病害状况;大跨径预应力混凝土梁桥产生这些病害的原因,涉及设计计算、施工工艺、养护管理、材料性质等多个方面,针对各典型病害分析其原因,并给出相应的预防措施,以期对实际工程有所裨益。

Analysis of typical diseases of long span concrete beam bridge in China and brief introduction of prevention and control technology

Prestressed concrete girder bridge is popular in engineering field for its advantages of good structural stiffness, smooth running and simple maintenance. However, in recent years, in the construction process or use stage of long-span prestressed concrete beam Bridges, there are generally a variety of diseases of different nature, the most common diseases are box girder cracking and long-term structural deflection; These diseases pose a threat to the durability and operation safety of Bridges, and even hinder and restrict the development of long-span prestressed concrete girder Bridges to a certain extent. In view of the diseases of existing long-span prestressed concrete beam Bridges, the causes of the diseases, the diagnosis of bridge damage, the repair and strengthening methods of damaged Bridges are urgent problems to be solved in the application of such Bridges. In this paper, the diseases of existing long-span beam Bridges in China are described. The causes of these diseases of long-span prestressed concrete beam Bridges involve design calculation, construction technology, maintenance management, material properties, etc. The causes of each typical disease are analyzed, and corresponding preventive measures are given, in order to benefit the actual project.