关键词: 爬升锥, 竖井, 灌浆, 钻孔, 平台悬吊

Abstract: The grouting for headrace surge shaft of Neelum Jhelum Hydropower Project is featured with extremely high safety risk and non-availability of multiple sets of suspension equipment due to the limited space of the surge shaft chamber. To solve these problems, a suspension system for the drilling and grouting platform that consisted of eight groups of double climbing cones (serve as main suspension point) and four safety ropes (serve as auxiliary suspension) was designed. The structure and working principle of this suspension system was introduced in detail, and the stress of the main operating platform of the suspension system under the most unfavorable working condition was calibrated. The engineering practice showed that the application of double climbing cones with multi-point suspension technology could reduce the construction cost, simplify the construction process and improve the construction efficiency, and could provide an useful reference for similar shaft grouting and drainage hole construction.

Key words: climbing cone, shaft, grouting, drilling, suspend platform