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基于锦屏II级水电站“大断面、长洞室、内燃作业、无轨运输、污染量大”等工程特点,针对该特长隧洞施工期通风难度大的问题,将运营通风射流技术引入施工通风中,通过理论研究结合现场通风测试,探讨了射流通风的需风量、风机台数计算公式及相关参数的取值原则。结果表明,能构成进出风通道的任何洞室群均可实施巷道式射流通风,其通风设备配置近似按通风阻力与射流升压计算。当实现通风距离5 730m(计入轴流距离)时,现场布置射流风机共43台,理论计算射流风机共41台,计算射流风机数量与现场布置十分接近,并且实际施工空气质量满足规范和人员健康的要求,主洞内平均风速大于0.2 m/s,施工支洞及排水洞内平均风速2~4 m/s。开挖爆破后5min内掌子面50m范围内即清晰可见,出碴时引水洞内能见度大于150m。
Based on the engineering features of Jinping II hydropower station “large section, long tunnel room, internal combustion operation, trackless transportation, large amount of pollution ” and so on, aiming at the problem of large ventilation difficulty during the construction of the long tunnel, the operational ventilation jet technology is introduced into the construction ventilation , Through theory research and field ventilation test, discussed the principle of value of air flow rate, the formula of wind turbine and the related parameters. The results show that the tunnel ventilation can be implemented in any tunnel group that can form the inlet and outlet air passages. The ventilation equipment configuration is approximately calculated according to the ventilation resistance and jet pressure rise. When the ventilation distance is 5 730m (included axial distance), 43 jet fans are arranged in the field and 41 jet fans are theoretically calculated. The calculation of the number of jet fans is very close to the on-site arrangement, and the actual construction air quality meets the specifications and personnel According to the requirements of health, the average wind speed in the main tunnel is more than 0.2 m / s and the mean wind speed in construction branch holes and drainage holes is 2 ~ 4 m / s. Excavation blast within 5min within 50m of the face is clearly visible, when the ballast water diversion tunnel visibility is greater than 150m.