| 1. |
Cross section can be changed continuously
from horizontal to vertical multi-circular shape or vice versa.
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The cross articulation system enables free control
of machine steering and orientation, and continuous change of multi-circular
cross section from horizontal to vertical alignment or vice versa.
| 2. |
Separate tunnels can be constructed
without driving a vertical shaft. |
Separating the shield machine under the ground
surface enables the construction of separate tunnels without driving
a mid- tunnel vertical shaft.
| 3. |
Construction period can be shortened. |
Simultaneous construction of multiple tunnels and
elimination of a mid-tunnel vertical shaft for constructing separate
tunnels contribute to shorter construction period than that required
for conventional methods.
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Costs can be reduced because work for improving
the ground or driving a mid-tunnel vertical shaft required for constructing
adjacent multiple tunnels or separate tunnels can be reduced considerably
or eliminated completely.
Cross articulation system
The cross articulation system articulates multiple front bodies of
a shield machine in reciprocal directions and make respective bodies
advance in different directions. The system enables shield machine
to generate rotating forces and advance so that the tunnel spirals.
Integrated segment
Spiraling tunnels can be constructed using integrated segments in
the section where two tunnels are combined and twisted. Segments for
ordinary single-circular tunnels can also be used for constructing
separate close tunnels.
Integrated segment
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