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我局系新线铁路基本建设单位,先后修建了成渝、宝成、都贵、川黔、贵昆、成昆等铁路,在施工中开凿隧道是常遇到的问题。1958年前隧道开挖多以干风钻为主,粉尘浓度高,因而对工人同志的健康造成了一定的影响。为了贯彻国务院“关于防止厂、矿企业中矽尘危害的决定”,于1958年以川黔线凉风垭隧道为重点,采用综合性防尘措施并取得了初步成效。经验推广后,有12个隧道的粉尘浓度达到了国家标准(2mg/m~3空
I Bureau of the new railway infrastructure units, has built Chengdu, Chengdu, Chengdu, Sichuan, Guizhou, Kunming, Kunming and other railways, tunneling is often encountered in the construction of the problem. Most of the tunnel excavations were predominantly dry-blast drilling before 1958, with a high concentration of dust, thus affecting the health of workers’ comrades. In order to implement the Decision of the State Council on Preventing the Dirt Damage Caused by Silica in Factories and Mines, a focus on the Liangchuanya tunnel in Sichuan-Guizhou line was adopted in 1958 with comprehensive dust control measures and initial results achieved. After the promotion of experience, there are 12 tunnel dust concentrations reached the national standard (2mg / m ~ 3 empty