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Construction of a pilot tunnel with the NATM. Athens Metro, Greece, June 1999
These photos were taken by D. Zekkos during the construction of a pilot tunnel
between the subway stations Agios Ioannis and Analatos. The purpose of the
pilot tunnel was to characterize the soils prior to the passage of the Tunnel
Boring Machine (TBM). The first Figure illustrates the one end-point of the pilot
tunnel. Various surveying methods (traditional as well as lazers) were used to
ensure that the construction of the tunnel reaches the locations predicted by
the design.
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between the subway stations Agios Ioannis and Analatos. The purpose of the
pilot tunnel was to characterize the soils prior to the passage of the Tunnel
Boring Machine (TBM). The first Figure illustrates the one end-point of the pilot
tunnel. Various surveying methods (traditional as well as lazers) were used to
ensure that the construction of the tunnel reaches the locations predicted by
the design.
_________________________________________________________________
Figure 1:The steel piles drilled into the
fragmented rock before the first
excavation
fragmented rock before the first
excavation
Figure 2: you can see a
concrete pump that is used
for the shotcrete. The drum
in front of it contains
chemical to accelerate the
setting of concrete.
concrete pump that is used
for the shotcrete. The drum
in front of it contains
chemical to accelerate the
setting of concrete.
Figure 3 illustrates the placement of shotcrete in the tunnel
phase.
phase.
Figure 4: Excavation in process according to the NATM.
