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在拱坝的水电站厂房中,为了发电机组的安装与维修,需要架设起重能力为几百吨的桥式起重机,起重机行车梁的轨道通常布置成具有一定半径的园弧线。为了减少行车梁运行时的阻力,必须严格控制两轨道中心线的间距,施工放样的任务就在于使轨道间的间距符合设计要求。要精确地控制弧形的行车轨道间距,使用一般的曲线放样方法,很难达到轨道设计
In the dam of hydropower plant, in order to install and repair the generator set, it is necessary to set up a crane with a lifting capacity of several hundred tons. The track of the crane beam is usually arranged with a circular arc with a certain radius. In order to reduce the resistance of the driving beam during operation, the spacing between the two track centerlines must be strictly controlled. The task of construction stakeout is to make the spacing between the tracks meet the design requirements. To accurately control the arc of the track spacing, the use of the general curve lofting method, it is difficult to achieve orbit design