摘要
当基坑不及时回填时,沉降监测点处于悬空状态时,常规水准测量需为仪器、水准尺搭建平台。为提高效率,提出视准线切顶法。首先,使水准尺和前、后视沉降监测点到水准仪的距离相等;然后,视准线精确切准后视监测点顶部,转动水准仪在水准尺上进行后视读数,同理得前视读数;最后,两次后视与前视读数之差的平均数即两个监测点高差。该方法在某电厂进行了试验,经过与二等水准对比,证明该方法可行,解决了困难条件下水准测量的技术难题。
Settlement monitoring points are suspensory when foundation pit can’t be filled in time. Some platforms have to be set up for level and leveling ruler if regular leveling is adopted. A new method of obtaining elevation difference by tangency between sight line of level and curved tops of points is proposed to improve efficiency. The leveling ruler is set on the same circle with two suspensory settlement monitoring points and the level is set up on the center of circle. When sight line of level is accurately tangent to curved top of point, the level is turned to aim at the leveling ruler and readings are obtained. The elevation difference of two monitoring points is the difference of back readings and front one. Some suspensory settlement monitoring points were surveyed at a power plant by the method. The result was compared with second order leveling. It was verified that the new method is feasible. The technical reference is provided to survey suspensory settlement monitoring points directly at difficult condition.
作者
张根山
ZHANG Genshan(Power China Hebei Electric Power Enginering Co.,Ltd.,Shijazhuang 050031,China)
出处
《测绘地理信息》
2020年第6期88-90,共3页
Journal of Geomatics
基金
国网基建部2019年依托工程基建实用新技术研究应用项目(201903)。
关键词
数字水准仪
悬空沉降监测点
视准线切顶法
digital level
suspensory settlement monitoring point
method of obtaining elevation difference by tangency between sight line of level and curved tops of points
