论文部分内容阅读
日本有公路110万公里,桥梁46万座,总延长6,600公里,占公路总里程的0.61%。战后,日本的桥梁建设迅速发展,1975年为1950年的180%。1970年在一般国道所建成的桥梁达260座左右。而1974年受到了石油危机的严重影响。日本的公路桥梁,从桥型所占比例看,钢桥占55.7%,预应力钢筋混凝土桥占21.2%,混凝土桥占19%,石木桥只占1.3%。目前钢桥仍居首位;平均桥长:钢
Japan has 1.1 million kilometers of roads and 460,000 bridges, with a total extension of 6,600 kilometers, accounting for 0.61% of the total mileage of the highway. After the war, the bridge construction in Japan developed rapidly, from 180 in 1975 to 1950. In 1970, a total of 260 bridges were built in the general national highway. In 1974, it was severely affected by the oil crisis. Japan’s highway bridges, from the proportion of the bridge type view, accounting for 55.7% steel bridge, prestressed concrete bridge accounted for 21.2%, 19% concrete bridge, stone bridge only 1.3%. Steel bridge is still the first place; the average bridge length: steel