一、前言幌萠大桥是位于日本北海道室兰市幌萠町陈屋川上的一座公路桥,是日本用推移法架设的第一座预应力混凝土连续梁桥。由于该桥是跨越陡峻的深谷,最好尽量采用无支架施工。桥基地质条件良好,采用直接基础。在选择上部构造的型式时,曾就下列四种方案进行了比较: 1.用推移法架设的预应力混凝土三跨连续梁; I. Introduction Sapporo Bridge is a highway bridge located on Chenyakawa, Sapporo-cho, Muroran, Muroran, Hokkaido, Japan. It is the first prestressed concrete continuous girder bridge built by Japan by the transitional law. As the bridge is steep across the steep valley, it is best to try to use stentless construction. Geological conditions of the bridge is good, using a direct basis. In selecting superstructures, the following four scenarios have been compared: 1. Prestressed concrete three-span continuous beams erected by the transition method;