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利用倒垂设备观测大坝位移,具有设备简单,精度高等优点,在我国水工观测中已被广泛采用。由于倒垂孔的垂直度要求高——一般要求终孔的孔斜值不得大于孔径的一半。没有良好的钻机和可靠的测斜方法,对于孔深30米以上的钻孔,要达到要求是很困难的,甚至造成返工和浪费。我厂大坝是混凝土宽缝重力坝,最大坝高95.3M,大坝基本建成后才从坝顶钻倒垂孔。施工用旧的老式300型钻机,φ150mm 钻头,成功地施钻了孔深23M、30M、40M、50M 四个倒垂孔,各孔终孔的孔斜分别
The use of downhole equipment to observe the displacement of the dam has the advantages of simple equipment and high precision, and has been widely adopted in China’s hydraulic observation. Due to the verticality of inverted vertical holes demanding - the general requirements of the final hole hole aperture should not be greater than half the aperture. Without a good rig and a reliable method of inclinometer, it is difficult to meet the requirements for bore holes with a hole depth of more than 30 meters, resulting in rework and waste. The dam of our factory is a concrete wide-gap gravity dam with the maximum height of 95.3M. After the dam is basically completed, the vertical holes are drilled down from the crest of the dam. Construction of the old 300-type drilling rig, φ150mm drill, the successful application of the hole depth 23M, 30M, 40M, 50M four inverted hole, the holes of the hole in the final hole were oblique