在山区公路建设中,改造既有公路以及改渡为桥等工程项目中,必然遇到选择桥型问题。如果当地藏有合格的石料,充分地利用当地天然资源和人力资源修建石拱桥,就当前来说,不仅在技术上和使用效果上是极其合理的,同时也是很经济的。为了说明它的经济性,现就具有可比性的一座钢筋混凝土箱型拱桥和两座石拱桥对比,列表于后。 In the mountain highway construction, reconstruction of existing roads and the transition to the bridge and other projects, will inevitably encounter the choice of bridge type. If the local possession of qualified stone, full use of local natural resources and human resources to build stone arch bridge, for the time being, not only technically and the effect is extremely reasonable, but also very economical. To illustrate its economics, a comparable reinforced concrete box arch bridge and two stone arch bridges are listed below.