Abstract
This article describes the main stages involved in the construction of the shafts (large-diameter vertical wells), which are necessary for the subsequent construction of the tunnels.The different risk situations present during the construction of the Eastern Drainage Tunnel (in Spanish, “Tunel Emisor Oriente”-TEO) are analyzed. In order for this 52 km-long and 7.5 m-wide tunnel to carry sewage, 25 shafts must firstbe built ranging from 55 to 150 meters deep. The magnitude of such a project implies working in different geographical areas and varied geological strata involving the presence of groundwater, which increases the risks due to possible landslides or flooding during excavation. Sincedigging will occur in different types of soil, varying procedures must be used depending on soil type. Likewise, due to the magnitude of this kind of project, detailed scheduling planning is required as simultaneous work on different fronts is necessary to meet deadlines. The study mentions that, while projects like these involve high risks for workers, analysis of activities and situations is conducted precisely to demonstrate that such risks can be considerably reduced.
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