有限条件下的压入式通风极限通风距离分析

Analysis on extreme distance of forced ventilation under limited conditions

面临"多通道,多界面,多工序",且1#引水洞必须首先贯通等复杂局面,锦屏引水洞施工通风不得不各自形成独立的施工场面,独头通风必须最大限度地发挥作用。为此,通过理论研究并结合现场通风测试,探讨了在目前能代表国内通风最好硬件下压入式通风的极限通风距离。研究结果不但确定了极限通风距离的最小风速和压入式通风的合适极限控制距离,而且还给出了在支洞受限条件下可以实现的通风距离且其计算结果与风机的现场实际布置十分吻合。

Facing a complicated construction condition, i.e. multi-channels, multi-interfaces, multi-working processes, etc. , moreover, the break-through of the No. 1 diversion tunnel must be firstly realized, the ventilations for the construction of the di- version tunnel of Jinping II Hydropower Station have to form their own working faces and the role of the single-head ventilation must be maximally played. Therefore, through the theoretical study combined with the in situ ventilation test, the extreme dis- tance of the representative forced-ventilation equipped with the best hardware at present in China is discussed herein. The study result not only gives the minimum wind speed of the extreme ventilation distance and the suitable extreme controlled distance of the forced ventilation, but also presents the realizable ventilation distances under the limited conditions of the construction adits ; from which the calculation results are quite coincided with those of the in situ layout of the ventilators.