关键词: 混凝土搅拌企业, 小微企业, 矽尘, 职业卫生管理

Abstract: Objective To understand the dust nature,harm degree and occupational health management status of concrete mixing enterprises in Wuhan City,provide technical basis for health administrative departments to carry out occupational disease prevention and control work. Methods From August to November 2021,93 concrete mixing enterprises in Wuhan City were randomly selected as subjects,and their occupational health status was investigated according to the questionnaire stipulated by the state. The contents of dust concentration and free silica at the post of material preparation were sampled and detected,and the characteristics of dust hazard and occupational health management of such enterprises were analyzed. Results The silica dust was the main dust in concrete mixing enterprises（92.1%）. 77 enterprises with silica dust were monitored,with an over standard rate of 7.02%,and 16 enterprises with cement dust were monitored,with an over standard rate of 3.13%. There were statistically significant differences in the setting of dust prevention facilities,the wearing of dust masks,and the setting of dust occupational hazard warning labels and warning instructions among enterprises of different scales（all P<0.05）. In terms of occupational health management,there were positive correlations between most of the items（r=0.276-0.646,all P<0.01）,and there was a negative correlation between on-site dust concentration and the wearing of dust masks（r=-0.210,P<0.05）. Conclusion The silica dust is the key control factor of concrete mixing enterprises,small and micro enterprises and enterprises without dust-proof facilities are the focus of attention.

Key words: Concrete mixing enterprise, Small and micro enterprises, Silicon dust, Occupational health management