随着我国社会经济和交通运输事业的快速发展,过去修建在各级公路上的桥梁,负担着十分沉重的交通荷载及繁重的交通量。由于历史的种种原因,如当时建桥资金短缺,当时的设计理念导致设计荷载偏低,技术力量的缺乏,设计、施工管理的粗放,施工技术水平较低和设备、手段、材料的落后,以致在设计上或多或少存在考虑不周的缺点,施工也留下大小不同的缺陷。根据近年对超限运输桥梁及大中型桥梁的加固实践,主要介绍公路旧桥各组成部分的加固方法。 With the rapid development of our socio-economic and transport undertakings, bridges built on the roads at various levels in the past have borne very heavy traffic loads and heavy traffic. Due to various historical reasons, such as the lack of funds for bridge construction at that time, the design concept at that time caused the design load to be too low, the lack of technical strength, the extensive design and construction management, the low level of construction technology and the backward equipment, means and materials. In the design of more or less ill-considered shortcomings, the construction also left the size of different defects. According to the reinforcement of overloaded transport bridges and large and medium-sized bridges in recent years, this paper mainly introduces the reinforcement methods of all components of old bridges.