高海拔高地应力区深斜井扩挖施工单价分析

Analysis of unit price of expanding-dig construction in deep inclined shaft of high altitude and field stress area

布仑口-公格尔水电站地处高海拔、高地应力区,其引水斜井是目前国内已建和在建中倾角最大的深斜井之一,工程施工难度大。斜井工程采用先开挖施工导井,然后进行扩挖施工的方案。通过技术研究和改进,使用了自下而上全断面钻孔爆破斜井溜渣的斜井扩挖施工方法,保证了斜井扩挖的施工安全、质量、进度和经济性,引水斜井顺利贯通。单价分析结果及工程实践表明:该斜井扩挖施工技术具有投资小、设备和技术简单、操作方便等优点。

The Bulunkou -Konggur hydropower station is located in high altitude and filed stress area. As one of the biggest steeply inclined shaft among the shafts having been built and being built in domestic at present. The engineering construction is very difficult. The technology of inclined shaft is followed by the pilot shaft construction and then the expanding excavation. Through technology research and improve- ment, the construction method of inclined shaft expanding excavation in whole section bottom - up drilling blasting was used, which ensured the security, quality, progress and economy of construction inclined shaft, and the smooth completion of diversion inclined shaft. Unitary analysis and engineering practice show that the inclined shaft technology of expanding excavation has the advantages such as small invest- ment, simple equipment and technique and easy operation.