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Drilling Construction of Inverted Plumb Holes in the Monitoring System of Yunfeng Dam
Pages: 97-100
Year: Issue:  3
Journal: Dam Observation and Geotechnical Tests

Keyword:  monitoring systeminverted plumb holedrilling construction;
Abstract: In dam monitoring sys tems, there are many construction methods to drill inverted plumb holes. Based on practical experience,one of the methods called pilot-holemethod is discussed, which is of referential value to colleagues. This method reduces the error probability in drilling large diameter holes and guarantees the drill precision. It improves effi ciency and decreases duration. Therefore, this method saves the expense of constructions and reduces project cost.
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