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50、60年代坑道作业的特点是干式作业(干打眼),以手工操作为主,由于坑道内粉尘浓度高,个人防护差,坑道作业工龄虽短但患病率高。从就诊的597人中,就有290人确诊为矽肺,构成比为48.6％。现对其中120例住院一期矽肺患者进行发病情况统计分析。
In the 1950s and 1960s, the operation of tunneling was dry operation (dry drilling), which was dominated by manual operation. Due to the high dust concentration in the tunnel and poor personal protection, the working length of the tunnel was short but the prevalence was high. Of the 597 people who were treated, 290 were diagnosed as silicosis with a ratio of 48.6%. Including 120 cases of hospitalized patients with silicosis incidence of a statistical analysis.