建筑施工中经常用水准仪进行抄平来测量高差。抄平作业常采用两种方法:一种是升降标尺法,即先立标尺于基准点上测出高程并在标尺上明显作标记,然后搬动标尺至另一点,用水准仪中的水平线来控制标尺的升降至标记处,标尺底端即与基准水平高程相同;另一种是读数计算法,即先立标尺于基准点上测出高程并读数记录,然后搬动标尺至另一点测出高程也读数记录,两次读数记录值经计算可得两点高差值。实践证明,升降标尺法准确度较高,但操作颇费力时;读数计算法操作快速简便,但因标尺刻度较大,厘米以下需估读,准确度较差。在施工实践中,我们总结出一种改进读数计算法,操作简便快速,准确度也高。现介绍于下: 先选用刻度清晰无锈斑的小钢卷尺倒挂于标尺 Frequently, water leveling instruments are used in building construction to measure elevation differences. There are two methods for leveling operations: one is the lifting ruler method, which is to first measure the elevation on the reference point and mark it on the ruler. Then move the ruler to another point, and use the horizontal line in the leveling instrument to control. When the ruler moves up and down to the mark, the bottom of the ruler is the same as the reference level elevation; the other is the reading calculation method, which means the elevation scale is measured on the reference point and the reading is recorded. Then the ruler is moved to another point to measure the elevation. The readings are also recorded, and the two readings are calculated to obtain the difference between the two points. Practice has proved that the lifting ruler method has a high accuracy, but when the operation is laborious; the reading calculation method is quick and easy to operate, but due to the large scale of the scale, the following cm must be read and the accuracy is poor. In construction practice, we have summarized an improved reading calculation method that is simple and quick to operate and accurate. Now introduced in the following: First use a small steel tape measure with a clear scale and no rust to hang it upside down on the ruler