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本文主要介绍了公路桥梁设计荷载标准、分析了全国的国道、省道和县道公路以及大中型桥梁各级设计荷载的百分比．并详细讨论了体外预应力索加固技术组成部分及优点．说明了体外索加固技术在旧桥加固中的作用及意义。
This paper mainly introduces the design load standards of highway bridges and analyzes the percentage of design loads at all levels of national highways, provincial highways and county roads as well as medium and large bridges. The components and advantages of external prestressing cable reinforcement technology are discussed in detail. Explain the function and significance of extracorporeal cable reinforcement technology in the reinforcement of old bridge.