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| New
Space for the Creation of Cities - Deep
Underground |
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Progress in the
use of the Deep Underground |
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Subsurface congestion
under road |
The subsurface under roads in big cities is already crowded
with underground facilities such as rail lines, and tunnels for electricity,
gas, telecommunications, water and sewage, and conduits. For example, the
subsurface of a national highway in Tokyo has about 33 km of conduits per
kilometer of road.
For this reason, newly built subways, etc. must be built deeper year by
year in order to avoid those conduits.
Conduits under national roads in
the wards of Tokyo
(161.2km of national road under direct
administration of National Government) |
|
| |
Total
length (km) |
No.
of kilometers (km)
of underground facilities
per one road km |
| Telephone
lines |
2,684.1 |
16.7 |
| Electric
lines |
1,660.7 |
10.3 |
| Gas |
325.9 |
2.0 |
| Water
supply lines |
364.6 |
2.3 |
| Sewage
lines |
315.7 |
2.0 |
| Total |
5,351.0 |
33.3 |
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| Materials: MLIT |
| Note: |
| 1. |
As of
April 1, 2004 |
| 2. |
Total
length refers to total length of under-road conduits |
| 3. |
Does
not include conduits to each building. |
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Subsurface congestion at Iidabashi in Tokyo |
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Excavation of tunnel
by shield machine |
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| 1. |
Machines
such as that in the graphic are used when tunnels
are excavated in the Deep Underground. |
| 2. |
Tunnels
are finished with concrete panels while the shield
machine excavates. |
| 3. |
This
tunnel is used for the passage of trains and
cars, the flow of water, and electric and
telephone lines. |
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Slurry pressure shield
At present, it is possible to excavate
tunnel with diameters of around 15 meters. |
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Three centered shield
This is a three centered shield machine
that can excavate the platform of stations. |
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| MLIT |
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Deep Underground
Utilization Planning Office Metropolitan Areas Development
Division, City and Regional Development Bureau, MLIT
2-1-3, Kasumigaseki, Chiyoda-ku, Tokyo 100-8918
Tel: 03-5253-8111 (Reception)
Fax: 03-5253-1587
E-MAIL: daisei@mlit.go.jp
MLIT website for information on use of the Deep Underground
http://www.mlit.go.jp/crd/daisindo/index.html
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| Chika-Chan |
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