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小高层建筑物施工时,竖向轴线的测量采用内控法,一般有激光铅垂仪法、天顶垂准测量和天底垂准测量几种方法。为了将控制轴线引测到施工层,一般需要留设多个测量孔,多次架设仪器,费工又费时。某工程在施工中,使用J2-1光学经纬仪,利用邻近已建建筑物,合理设置控制点,一次设立测站,即可在施工层得到符合精度要求的控制轴线。
Small high-rise building construction, the vertical axis of measurement using internal control method, the general laser vertical instrument method, vertical zenith and vertical and horizontal vertical measurement of several ways. In order to lead the control axis to the construction layer, generally need to set aside more than one measurement hole, set up the instrument several times, time-consuming and laborious. A project in the construction, the use of J2-1 optical theodolite, the use of adjacent buildings have been built to set reasonable control points, set up a station, you can get the construction level in line with the accuracy of the control axis.