高海拔隧道施工供氧技术方案设计

Design of oxygen supply technology for highaltitude tunnel construction

目的:解决高海拔隧道施工中严峻的缺氧问题,确保人员安全与施工效率。方法:通过分析液氧、气瓶、变压吸附(PSA)等多种供氧技术,发现局部富氧空气与PSA制氧为较优方案。结果:研究提出了一套综合供氧策略:针对开挖面采用局部弥散供氧结合长管呼吸面罩;喷浆区推荐个人携氧设备;二衬作业与生活区实施移动吸氧车与弥散供氧。以海拔4000m隧道模型为例,设计采用2套PSA制氧设备,有效提升氧气浓度至平原65%水平,相当于施工海拔降至3600m。结论:综合运用PSA制氧与针对性供氧方法能有效应对高海拔施工挑战,为类似工程提供科学指导。

Objective:To tackle the severe hypoxia in high-altitude tunnel construction,ensuring personnel safety and construction efficiency.Methods:By analyzing various oxygen supply technologies,including liquid oxygen,cylinder-based systems,and pressure swing adsorption(PSA),it isfound that localized oxygen-enriched air and PSA oxygen production were superior options.Results:A set of comprehensive oxygen supply strategy was put forth:combining local dispersion oxygen supply with long-tube respirators for excavation sites;advocating personal oxygen carriers for shotcrete operations;and employing mobile oxygen vehicles and dispersion oxygen supply in secondary lining works and living areas.Taking a 4000 m altitude tunnel model as an example,two sets of PSA oxygen production equipment were designed to effectively elevate oxygen concentrations to 65%of sea-level standards,which was equivalent to the constructionelevation dropping to 3600 m.Conclusion:The comprehensive application of PSA oxygen production and tailored oxygen supply method can effectively deal with the challenges of high-altitude construction and provide scientific guidance for similar projects.