多公共转点侧方交会超短边导线测量技术

Measurement Technique of Super-short Side Traverse Surveying Intersection of Multi-common-points

特长隧道洞内控制测量中遇到斜井转入正洞、平行导坑转入正洞、为绕开不良地质地段的U形导洞等情况时,通视距离有时只有20~30 m,常规导线测量方法受到仪器、目标棱镜、对中误差、观测误差的影响,方位传递测量精度难以保证隧道继续往前开挖。为此,针对20~50 m超短边导线测量,提出采用多公共转点侧方交会超短边导线测量方法,实现导线坐标、方位的高精度传递,保证特长隧道洞内控制测量精度。

During the internal tunnel control measurement of extra-long tunnel,the inclined shaft is shifted into the main tunnel,the parallel adit is shifted into the main tunnel,the U-shaped pilot tunnel at adverse geological section is avoided,and the visible distance may be as short as 20 ~ 30 cm,and under such circumstances,using conventional traverse survey method may be affected by instrumentation,target prism,error of centralization,error of observation,and the measurement accuracy of azimuth transfer could hardly assure the advancing of tunnel excavation,and therefore,the super-short side traverse measurement method of multi-commonpoints side intersection is proposed for the 20 ~ 50 cm super-short side traverse measurement to realize highly accurate transfer of traverse coordinate and azimuth and to ensure the measurement accuracy of internal tunnel control measurement.