In the context of urban rail transit line sections developing towards long distances and large radii,as the section length increa-ses,the method of using in-cavity wires for azimuth and coordinate control will face risks such as penetration error exceeding limits.In order to reduce lateral penetration errors,this paper proposes a method of transmitting coordinates and azimuth angles in the tunnel using a free sta-tion network method,and conducts experimental verification with the wire measurement method.The results show that the free station network method is used to guide the tunnel penetration plane penetration error compared to the wire network method.The accuracy is increased about 50％,effectively ensuring the penetration accuracy and reducing the penetration risk.
关键词
长区间盾构隧道/洞内平面控制网/自由设站法/导线法
Key words
long section shield tunnel/tunnel plane control network/free station setting method/wire method
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