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在国内混凝土面板堆石坝施工中,堆石料的开挖大多采用110mm 口径以下低风压潜孔钻钻孔、梯段爆破方法,而在水利部“八五”科研项目——浙江鄞县梅溪深覆盖层混凝土面板堆石坝的堆石料开挖中,却采用了大口径高风压潜孔钻钻孔、梯段爆破方法。实践证明,该方法能开挖出满足设计级配要求的堆石料,可大大提高开挖强度,而且能降低工程造价,节省工程投资,进一步体现了混凝土面板堆石坝投资省、工期短的优越性。本文将对大口径高风压潜孔钻钻孔、梯段爆破开挖堆石料施工定额拟定及单价分析进行探讨。
In the construction of concrete faced rockfill dam in China, most of the excavation of rockfill materials adopt the method of low pressure pressure down-hole drilling and blasting under the 110mm caliber, while in the Ministry of Water Conservancy “85 ” research project - Zhejiang Yin County Meixi deep overburden concrete faced rockfill dam rockfill dug excavation, but the use of large diameter and high pressure DTH drilling, blasting ladder method. Practice shows that this method can excavate the rockfill material that meets the requirements of design gradation, which can greatly enhance the excavation strength, reduce the construction cost and save the project investment, and further embodies the superiority of the investment in the concrete face rockfill dam and the short construction period Sex. In this paper, the large caliber high pressure DTH borehole drilling, rock blasting excavation section of the construction quotas and price analysis.