PRH 7 4000091
天
K
|香港政府
GIS
新聞處
DAILY INFORMATION BULLETIN
Sunday, November 5, 1972
LASER LIGHT SYSTEM BEING USED IN CONSTRUCTION OF HIGH ISLAND TUNNELS
The construction of the $300 million tunnel system of the High
Island Reservoir, situated south-east of the Sai Kung Peninsula, is now well
underway.
Since the start of the project in January, more than 12 miles of
access road have been built and two miles of tunnels driven.
The 800-strong labour force is working on 11 portals and 8 shafts,
An unusual aspect of the tunnel construction is the use of the Laser
Beam system for survey work inside the tunnels.
The Laser forms a concentrated beam of light which is being used to
pinpoint the tunnel alignment. The device is suspended from the ceiling of
the tunnel and the thin red beam shines onto the face of the rock indicating
the line for tunnelling.
The particular Lager used in the High Island Tunnels has a range of
about 1,200 feet.
The Resident Engineer of the Eastern Tunnels, Mr. I.R.$. Robertson,
said that with the use of the Laser, the speed of the tunnel work will be
increased and a lot of manpower saved.
/He explained:
Issued by Government Information Services, Beaconsfield House, Hong Kong. Tel: 5-233191
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