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| Directional and Connectional Measurement Technology for Silo 3 of Liuyanghe Tunnel with Gyro |
| YUAN Ren-ai, DU Qiang, LUO Tian-lang |
| China Railway First Guop Co. Ltd, Xi′an, Shanxi 710054, China |
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Abstract Research purposes：The Silo 3 of Liuyanghe Tunnel of Wuchang - Guangzhou Passenger Dedicated Line is about 51.03 m deep and the length of the construction area of silo 3 is about 1.5 km. The high measurement accuracy is required for linking up the two ends of the silo with the inclined shaft and exit separately due to small silo portal. Using one - shaft orientation or two - shaft orientation method, it is hard to operate with low measurement accuracy. In order to through connect the whole Wuchang - Guangzhou Passenger Dedicated line, the connectional measurement plan for the silo should be determined in accordance with the local geographical condition and the structural feature of the silo for smooth construction of the silo with high accuracy.
Research conclusions：Through comparison, it is determined to conduct the measurement jointly with lead - hammer meter and gyro. The measuring principle and procedure of this method are described. The directional measuring number of gyro is at lease not less than three times. Before doing so, the ground control net should be measured closely and at the same time one known side on ground should be chosen to measure the position angle between it and gyro. This position angle should be compared with the inversely calculated position angle and its measurement accuracy should be verified. The measurement result after the through connection of the line shows the measurement accuracy can meet the requirement of large section tunnel construction of passenger dedicated line.
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Received: 04 November 2008
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2010, Vol. 27 
