一俯视仰视垂准测量技术垂准测量是建筑施工测量的主要方法。上海市第三建筑工程公司在总结1974年以来在滑模升板施工中使用仰视法垂准测量的基础上进一步改进完善了安全设施、观测目标板和加装弯管目镜的观测方法,并将其应用到高层施工测量中取得了成功。同时又于1983年自行改装了一台意大利经纬仪开始了俯视法垂准测量的研究。1985年9月该公司与上海第三光学仪 A top-down look-and-see vertical survey technique is a major measure of construction surveys. The Shanghai No. 3 Construction Engineering Corporation has further improved and improved the safety facilities, the observation target board and the observation method of installing the elbow eyepieces on the basis of the use of vertical sighting vertical surveys in the construction of sliding form slabs since 1974. Its application to high-level construction surveys has been successful. At the same time, in 1983, the Italian theodolite was modified by itself to begin the investigation of vertical surveying. In September 1985, the company and Shanghai Third Optical Instrument