as a ventilation exhaust. Water see- page and condensation above the ceil ing drain behind a secondary p.v.c. lining to the underside of the carriage-
way.
Ventilation and Lighting
Ventilation is supplied mechanical- ly from two stations, one at each end of the tunnel, Each station is equip ped with four supply fans and four exhaust fans and is capable of supply- ing 300.000 cu. ft. of air per minute. Fresh air is forced through supply ducts under the carriageway and led into the tunnel through grilles pro- vided in the walkways. It is then withdrawn through slots in the ceil- ing and returned to the stations where it is exhausted.
Carbon monoxide detectors, traffic warning signals, visibility meters, fire fighting equipment and emergency telephones installed in the tunnel are connected to a control room in the administration building. The detec- tors provide the control room with the carbon monoxide concentration and degree of visibility in the tunnel. The controller can vary the ventila- tion fan speed to give the desired quantity of fresh air.
It
The administration building is sited at the Sha Tin end of the tunnel. also houses modern equipment for traffic control, toll collection registra- tion and control, and emergency ser- vices. A miniature diagram panel. which enables the controller to exer- cise direct and immediate control
-+
ง
over all phases of the tunnel opera- tion, is also provided.
The main lighting in the tunnel consists of a single row of fluorescent lights on each side. For the first 400 ft, at each portal supplementary lighting is provided to assist drivers to adjust their eyes to the illumina- tion inside the tunnel. The lighting can be varied according to outside conditions.
A "no break" generator set is in- stalled in each of the ventilation stations to provide emergency light- ing to the tunnel.
A six-booth toll plaza is built at the Sha Tin end to serve seven traffic lanes. Three of the booths are re-
SHA TIN
TIDE
COVE
BRIDGE
NORTHERN APPROACH ROAD
Toll booths
versible to suit peak traffic flow. Each booth has equipment for toll collec- tion, vehicle classification, fare indica- tion, traffic counting and registration.
Design
The tunnel was completely designed and supervised by the Civil Engineer- ing. Electrical and Mechanical, and Waterworks Offices of the Hong Kong Public Works Department.
Cost of Works
Tunnelling, including com- partment for trunk water mains
Road through tunnel P.V.C. sheet lining
HK$ million
13.35
3.16
0.60
Ventilation stations
0.73
Ventilation equipment
1.40
Toll booths, subcontrol
station and administration
building
0.32
Toll registration and con-
trol equipment
0.82
Lighting
1.43
Fire mains and hydrants Recovery vehicles, traffic signs and miscellaneous works
0.18
0.18
22.17 million
CANTON
RAILWA
CHATHAM RD
PRINCESS INFRADI
WATERLOO RD.
ROAD
NATHAN
TSIM SHA TSUI
-LION ROCK TUNNEL
SOUTHERN APPROACH ROAD
ROAD
Total
Contractors
General contractors
were as follows: ventilation
Chee Cheung Hing & Co.
stations.
Kwong Tai & Co.
admin, building.
—
toll booths and
Societe Francaise d'Entreprises de Dragages et de Travaux Publics tunnelling.
Yau Wing Co. Ltd.-road through tunnel. Major sub-contractors:
Acme Metal Works fixing of p.v.c. sheet lining.
American Engineering Corporation lighting equipment.
Plessey (N.Z.) Ltd.-supply and installa- tion of tunnel control and toll equipment. Mitsubishi Shoji Kaisha Ltd. Supply
of p.v.c. sheeting.
Philips (H.K.) Ltd. lighting equipment.
Plessey (N.Z.) Ltd. stallation of tunnel
equipment.
supply of tunnel
supply and in- control and
toll
Colchester
―
supply of
Woods of ventilation plant.
Contractors for subsidiary works
The Express Transport & Building Con- construction of southern
tractors Ltd.
KOWLOON BAY
approach road.
Fung Kau Kee
construction of pre-
stressed concrete bridge over Shing Mun river.
Winsome Co. Engineers & Builders Ltd. site formation for southern approach road. Yau Wing Co., Ltd. construction of northern approach road.
—
Far East Architect & Builder December, 1967
61
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