| Summary: | 碩士 === 嘉南藥理大學 === 職業安全衛生系 === 106 === Through the inspection results of the current manhole operation inspection and permission table in the telecommunications industry, the manhole work in the telecommunications industry is discussed in different labor backgrounds, work areas, work sites, working hours, work dates, work months, and work seasons. Correlation Analysis of Gas Concentration Measurement in upper, middle and lower Holes . To confirm the potential hazards of current manhole operations and develop control strategies.
A total of 1121 and nearly 1489 telecommunication manholes were measured for gas concentration in the Tainan area. Zero pen with oxygen concentration less than 18%. Only one manhole has detected that two hydrogen sulfide concentrations are between 5 and 10 ppm. It is the marginal qualified in Annan district. In Annan District, there were 49 carbon monoxide concentrations from 1 to 17.5 ppm and partially qualified 3%. The results of sub-atmospheric oxygen concentration measurement in Annan District were 71 (38.4%) qualified, 85 (45.9%) partially qualified, and 29 (15.7%) marginal. Total 185 data (100.00%). It is one of the regions with the highest abnormal percentage of qualified (45.7%) marginal qualifications (15.7%) in the city. Zero data with (H2S) hydrogen sulfide concentrations above 10ppm and carbon monoxide concentrations above 35 ppm are all compliant with the law.
There are 11 types of telecommunications manholes from size 0 to size 10, and their internal gas volume ranges from a minimum of 3.78 cubic meters to a maximum of 25.2 cubic meters. Continuous ventilation should take more than five minutes. Manhole opening and after ventilation. In-hole gas concentration measurement was performed. The results showed that oxygen concentration marginal qualified was 4%, carbon monoxide concentration partially qualified was 3%, hydrogen sulfide was all lower than 10ppm, flammable gas (CH4 etc.) was not detected in this study.
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