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Safety precautions against fuel leakage into NATM tunnels of Uskudar – Umraniye - Cekmekoy Metro Project

Safety precautions against fuel leakage into NATM tunnels of Uskudar – Umraniye - Cekmekoy Metro Project

14694_safety_precautions_against

H. Copur / N. Bilgin / İ. Gündoğdu / G. Kalaycı / H. İşler / M. Kocagil / A. Fisne

A sudden water inrush occurred along with fuel from the old / unused underground storage tanks of a fuel-station through one of the forepooling drills and thus, construction of the double- tube NATM tunnels with 30 m bench cross-section was stopped on 12 June 2015 in Uskudar - Umraniye - Cekmekoy Metro Project. The risks and safety precautions for re-starting the construction, are summarized. Probe-drill holes with 8 m length were drilled to drain the accumulated fuel within the fractures of limestone and mudstone and continue the construction. Ventilation system was revised; an automatic gas measurement and warning system was established; tunnel illumination and drainage were ex-proofed; some precautions were taken against a fire / explosion; safety clothes were provided for tunnel crew; the crew were educated for safety in the emerging conditions and evacuation. Surface of the temporary support was lined with a special membrane resistant against fuel and gasses.

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Year 2017
City Bergen
Country Norway