介绍北京地铁五号线东单站暗挖段下穿长安街，地面承受荷载大，且地下管线密集，与既有一号线结构间土层厚度仅为0.6m情况下，通过采取对既有线周边土体进行注浆加固、洞内施作预应力锚杆、施作大管棚注浆等施工措施，成功从地铁一号线东单至王府井既有区间上部穿过。

The mined section of Dongdan station on line 5 of Beijing Metro crosses underneath Chang'an street, where there exist concentrated underground utility lines and the thickness of ground between the mined section of Dongdan station and the structure of the existing line 1 of Beijing Metro is only 0.6m. Consolidation grouting is conducted for the soils near the existing running tunnel, prestressed rock bolts are installed inside the tunnel and pipe roof reinforcement and grouting are conducted, which ensures the successful construction of the mined section of Dongdan station that is located above the existing Dongdan～Wangfujing running tunnel of line 1 of Beijing Metro.