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近年来,日本铁道线路随着旅客量的增加而更加繁忙,为了适应运输需要和提高运输能力,原运营中的单线铁路隧道塔之峰隧道(延长为194m),已不能满足客流量的需要,因此,箱根登山铁道株式会社把其一部分扩建成复线隧道,其扩建工程采用新奥法和上半断面超前开挖法进行施工,本文着重介绍工程概要和施工方法的选择。
In recent years, the Japanese railway lines have been busier with the increase in passenger numbers. In order to meet transport needs and enhance transport capacity, the tower tunnel (extending to 194m), the former single-track railway tunnel, can no longer meet the needs of passenger traffic. Therefore, Hakone-Mountaineering Co., Ltd. expanded a part of it to a double-track tunnel. The expansion project is carried out by the New Austrian law and the advanced excavation method in the upper half. This article focuses on the selection of construction summary and construction methods.