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一、前言 永安里地铁车站及永一大区间隧道位于建外大街永安里至大北窑地段。永安里地铁车站为东西长235.4m,南北宽20.3m的三层框架结构,采用盖挖逆作法施工。永安里至大北窑区间隧道全长576.2m,其中包括隔断门、联络风道、区间风道以及折返线等结构,区间隧道采用浅埋暗挖法施工。作为地下工程测量工作包括地面测量、联系测量和地下测量三部分。地面测量分为地面控制测量和地面施工测量。为确保地铁车站及区
I. Foreword Yong’anli subway station and Yongyi tunnel are located in the section of Yong’an Lane and Dabeiyao kiln in Jianwai Avenue. Yong’An Li Metro Station is a three-story frame structure with east-west 235.4m long and south-north wide 20.3m. The tunnel length from Yonganli to Dabeiyao kiln is 576.2m in length, including the structure of partition door, connecting air duct, section air duct and reentry line. The tunnels are constructed by shallow burying and undercutting. As underground engineering survey including ground measurement, contact measurement and underground measurement of three parts. Ground measurement is divided into ground control measurements and ground construction measurements. To ensure that the metro station and district