The Austrian Practice of NATM Tunnelling Contracts
sults from the type of primary support, that is, open floor, invert slab, invert arch with or without longitudinal division. ..... Shotcrete SpC 20/25 dsv 0.15m. 4.49 mñ. 2.64 mñ. T. Immediately after excavation round. Wire mesh 1.96cmğ/3.08kg/mğ. 1 outer Layer. 29.95 mğ. 17.62 mğ. T. Immediately after excavation round.
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ytmk's website is ytmk.org.tr