新标准下普通公路单幅标准跨径桥梁改扩建总体设计方案探讨

摘要

随着经济建设和路桥事业的发展，我国公路基础建设重点向普通公路改扩建转移；加上新标准的实施，使得桥梁改扩建成为普通公路改扩建的重点及难点。文中总结了新标准对桥梁改扩建的新要求，确定了桥梁改扩建的原则，通过具体工程实例探讨了桥梁主体结构和桥面铺装的改扩建方案。%As the development of the economy and civil engineering,the major tasks of the road infra-structure constructions have become to rebuild and expand the existing roads.With the implementa-tion of the new regulations,rebuilding and expanding the bridges has become the most important and difficult tasks.This paper summarizes what's defined by the new regulations,proposals the guidelines for bridge rebuilding and expansion,and discusses the solutions of the bridges'main structure and sur-face's rebuilding and expansion.