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为避免隧道施工空气中的有害气体和粉尘危害施工人员健康,利用PortaSens II气体检测仪和激光粉尘仪分别对隧道施工中的主要有害气体和粉尘进行现场测试,根据测试数据对施工通风效果进行评价,对通风存在的缺陷进行完善。油竹山隧道空气质量测试结果显示,隧道施工第1、2阶段通风效果良好,第3阶段粉尘质量浓度超标。针对粉尘超标,在隧道产生粉尘最多的掌子面附近增设干式空气除尘机。增设除尘机后的掌子面附近粉尘测试数据显示,除尘机开启120s后,空气中的粉尘质量浓度由初始的75mg/m3下降到3mg/m3,空气质量达到隧道施工环境标准。隧道施工中,增设空气除尘的通风系统可有效保证洞内空气质量;在污风出口采取喷洒水雾、加强绿化等措施可减轻排出的污风对隧道周围环境的污染。
In order to avoid the harmful gas and dust in the air of tunnel construction endanger the health of construction workers, the PortaSens II gas detector and laser dust analyzer are used to test the main harmful gas and dust in tunnel construction on site respectively, and the construction ventilation effect is evaluated according to the test data , To improve the defects of ventilation. The results of air quality test of Yushan Mountain Tunnel show that ventilation effect is good in the first and second stages of tunnel construction and the dust concentration in the third stage exceeds the standard. For excessive dust, dust generated in the tunnel up to the face near the addition of dry air dust machine. Additional duster dust test data after the addition of the duster showed that the dust concentration in the air decreased from 75 mg / m3 to 3 mg / m3 after the dust collector was turned on for 120 seconds, and the air quality reached the tunnel construction environment standard. Tunnel construction, the addition of air dedusting ventilation system can effectively ensure the quality of the air inside the hole; spray at the outlet of the sewage spray to strengthen greening and other measures to reduce emissions of sewage on the surrounding environment pollution.