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倒垂孔是大坝监测系统的重要组成部分,精度要求高。龚嘴大坝倒垂孔孔深81.60m,是目前水电系统中施工难度较大的钻孔之一。本文介绍了倒垂孔施工基本情况。一、概述 70年代发展起来的大坝监测技术,目前已趋成熟和完善。垂线观测系统是监测大坝和岩体变形的直观手段。为安装好一组有使用价值的垂线观测系统,必须具备有效的铅直空间即垂线保护管的有效铅直管径,并且首先要完成能够埋设相应直径保护管的高垂直度钻孔。
Inverted hole is an important part of dam monitoring system, high precision. Gongzui dam inverted hole hole depth 81.60m, is currently one of the more difficult construction of the hydropower system in the borehole. This article describes the inverted hole construction of the basic situation. I. Overview Dam monitoring technology developed in the 1970s has now matured and improved. Vertical observation system is to monitor dam and rock deformation visual means. In order to install a set of valuable vertical observation systems, it is necessary to have an effective vertical space, ie the effective vertical diameter of the vertical protection tube, and the first to complete the high vertical drilling where the corresponding diameter protection tube can be buried.