Multi-technology combined measurement method for ultra-long seabed double-hole railway tunnel and service tunnel

Abstract

The invention discloses a multi-technology combined measurement method for a super-long seabed double-hole railway tunnel and a service tunnel. The multi-technology combined measurement method comprises the steps of GNSS measurement outside holes, traverse measurement considering vertical line deviation correction, deep shaft free observation station coordinate transmission measurement, free observation station in the holes, crossed double traverse and gyro orientation combined measurement. The distance of the subsea tunnel at the connection position of the transverse tunnel is short, and direction and distance transmission is conducted through an encryption station setting method. A combined lead is adopted in the hole to increase gyro orientation measurement, and azimuth angle precision is improved. According to the method, the measurement advantages of the GNSS and the total station are utilized, the measurement efficiency of the long and large tunnel deep shaft is improved, meanwhile, the coordinate transmission precision of the deep shaft is improved, in addition, direction and distance transmission is carried out in the transverse hole by adopting an encryption station setting method, closed networking is carried out among different transverse holes, the reliability of tunnel plane control measurement precision is improved, and the measurement precision is improved. And complete unification of coordinate systems of the left and right tunnels and the service tunnel is ensured.

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