| Summary: | 碩士 === 國立臺北科技大學 === 土木與防災技術研究所 === 91 === Sewerage system is the vital utility in a current civilized city, the sewage flows gravitationally into wastewater treatment plant for water quality improvement, amenity environment enhancement and going-concern to city development. Swiss IMD also adopts the coverage of sewerage as an indicator for the assessment to national competition. In addition to European countries, USA and Japan, other developing countries in South-East Asia, such as Thailand, Indonesia etc, are all devoting efforts on the sewerage construction development. Currently the network coverage in Taiwan is much behind compared with many countries in the world. Among city governments of Taiwan, Taipei and Kao-shiung cities are much organized and well functioned in sewerage networks. Other cities still are in initially developing stage and also aggressively moving on to. However, in terms of the mitigation of environment impacts during construction, the open trench construction works are getting less or forbidden to be applied in cities. Therefore, current construction for main sewer pipe and piping network prefer using shield-driving method to mitigate the impactions to the environment and municipal living quality.
There was a previously excavation case using shield driving method for the B main sewer pipe construction work and technical imported by Taipei Sewerage Bureau in 1975. However, it was failure owing to lack the soil improvement experience by the sub-contractor. In 1979 it then successfully completed the constructing work for main sewer pipe on Chieng-Kaow south, north road and relative sewer pipes in Taipei and Kao-shiung cities. There are still some reports related to the properties damage or personnel injured even if shield-driving method has been using in Taiwan for 30 years. In order to minimize these incidents, the author, a member of Taipei Sewerage Bureau, is summarizing the literature reviews for mitigation measures, emergency response together with author-self experience for the risk and damage preventing measures when shield-driving method was applying.
Some common incidents during constructing are such as flooding, excavation cave-in, foundation sinking, dropping, electric shocks, working in any confined space、gas explosion etc. However, the most seriously impact to property damaged or people injured mainly because of not heeded investigation to underground water and soil properties. The mitigation measures will include the implementation for investigation of pre-construction work、good plan & design work and properly machine selecting, QA/QC of construction work、OHS training etc.
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