Critics for new tunnel boring machine import from Germany for Nhổn - Hà Nội line. Expert explain critics why old tunnel boring machine for Bến Thành-Suối Tiên tunnel not used. Bến Thành-Suối Tiên line 19, 7km long. 2.6km long tunnel. Drilling by Japanese TBM. New Nhổn - Hà Nội line is 12km long. 4 km long tunnel. Why import new machine?
Expert say after digging Bến Thành-Suối Tiên line tunnel 2.6km, machine's digging shields damaged, broken it can not be used further. Therefore new TBM.
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Write off a TBM only after 2.5km of bore?
I do not think it was such a harsh geology to render a tunnel boring machine not-refurbishable...
I believe some good salesperson convinced them of buying a new TBM.
I feel very sorry that the limited resources of developing countries are thrown away so easily.
Nhổn - Hà Nội railway project tunnel : German TBM come in October and November
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cover tunnel photo by: Matt Brown from London, England / CC BY
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