In 2011 a contract was signed for the construction of Copenhagen's new metro line, Cityringen, which will connect 17 new underground stations in and around the centre of Copenhagen. To assist with the development of the city it was decided in 2012 and 2014 to add branches to Cityringen connecting the city centre with north and south harbour areas, respectively. This required the introduction of bifurcations to connect the branches to Cityringen tunnels. The bifurcations were made with the substantial modification of a shaft at Øster Søgade and the introduction of a new shaft, Havneholmen. This paper outlines both engineering and logistical challenges introduced by these changes, from the construction of a 35 m deep shaft around existing stacked tunnels adjacent to an operational railway line to how the closing tunnels for the construction of the shaft impacted the tunnel installations and the overall time schedule, plus numerous other issues.

中文翻译：

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扩展 Cityringen – 所涉及的挑战

2011 年，签署了哥本哈根新地铁线 Cityringen 的建设合同，该地铁线将连接哥本哈根市中心及周边的 17 个新地铁站。为了协助城市的发展，2012 年和 2014 年决定在 Cityringen 增设分支机构，分别连接市中心与北部和南部海港区。这需要引入分叉来将分支连接到 Cityringen 隧道。分叉是通过对Øster Søgade 的竖井进行实质性修改并引入新竖井Havneholmen 实现的。本文概述了这些变化带来的工程和后勤挑战，