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Tunnel piperoof grouting
Geneva, Switzerland - May 22, 2014: A big machine inside a tunnel construction site used for the construction of piperoof grouting in tunneling
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Keywords
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building
chamber
concrete
constructing
construction site
dark
digging
dirt
drill
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engineering
excavation
excavation support
geology
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mine
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piperoof grouting
power
securing
soil
subway
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