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在城市轨道建设中,盾构法作为一种常见的施工方法广泛运用于地铁暗挖隧道建设领域。建立地面与地下统一的坐标系是地下工程建设的测量关键,只有坐标统一才能保证盾构隧道顺利贯通。传统的联系测量有:三角联系测量,陀螺经纬仪定向测量和导线直接传递法等。但在地铁施工过程中,由于现场施工环境限制,以上方法都有各自的约束性。因此在保证精度的前提下,为了提高工作效率,提出一种新的联系测量方法 -两井无定向导线法。目前武汉大部分地铁工地都采用此联系方法进行控制测量。结合武汉地铁6号线3标地铁测量案例,从无定向导线的计算方法和精度着手,对无定向导线在地铁的应用进行简单探讨。
In the construction of urban railways, the shield method is widely used as a common construction method in the construction of subway tunneling. The establishment of a unified ground and underground coordinate system is the key to the construction of underground engineering, unified coordinates can guarantee the smooth tunnel shield. The traditional contact measurement are: triangular contact measurement, gyro theodolite directional measurement and wire direct transfer method. However, in the subway construction process, due to the restriction of on-site construction environment, the above methods have their own constraints. Therefore, under the premise of ensuring the accuracy, in order to improve work efficiency, a new contact measurement method - two wells without directional wire method. At present, most of the subway construction sites in Wuhan use this method of contact measurement and control. Combined with the case of 3-metro metro survey on line 6 of Wuhan Subway, this paper starts with the calculation method and accuracy of non-directional wire and briefly discusses the application of non-directional wire in metro.