昨天,在东长安街南侧的40米深的接收井内,随着直径达6.28米“正阳二号”盾构机刀盘破土而出,北京地铁8号线三期工程前门站至王府井站区间实现双线贯通,标志着贯穿北京南北中轴线的地铁8号线隧道区间工程全线贯通。
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