The Directors of the Hongkong Elte- capable of meeting the requirements for in height between Go' and 75'; cladding tric Co., Ltd., announced in August 1955 power on the Island of Hongkong for the of the framework will be in reinforced that they awarded the contract for the next two decades.
construction of their new generating
station at North Electric Co., Ltd.
carried
brick work. The roof will be formed in light steel troughed section with thin screed of concrete covering it.
a
Point to the English Scope of New Building Works of London. The initial contract is for a value of approximately existing Power Station as being
The first part of the extensions to the
An overhead Crane will be installed on $25,000,000 and is the commencement of out by George Wimpey & Co, will
a gantry extending over the full length new project ultimately intended to provide generating capacity for the island an area of some 35,000 square feet. of the Turbine House, of Hongkong to a total of 180,000 KW, of the existing installation and comprise buildings will lie to the cast
THE NEW STATION
The Station will be erected on 7 site adjacent to the existing Power Station at North Point.
The new
Pump House
a Turbine House and Boiler House with A unique feature of the work will be an adjoining Control Room and Ameni- the construction of the Cooling Water ties block: between the Turbine House Pump House. This building, the founda- and the sea a Cooling Water Pump House, tions of which are 30' below ground level, with an annex for the chlorination plant, is also situated over the redundant Sea will be sited. Cooling water, drawn from Wall and therefore it is impossible to the sea, will be carried through twin re- construct it within the conventional type inforced concrete culverts from the Pump of sheet piled cofferdam. turbo-alternator
A scheme has House to the turbines and through similar culverts will outfall into the sea west of the new work.
The present contract covers the supply, erection and setting into operation of 1-30,000 K.W. steam set operating at a pressure of 600 ibs. per sq. in. at a temperature of 850 F. conforming to modern standard British practice, supplied from an integral fur- nace, oil-fired boiler having a capacity of 315,000 lbs. of steam per hour. Genera- tion will be at 11.8 K.V. stepped up through a 37.500 kva transformer to feed into the power company's transmission system at 22 K.V.
The
Foundation Problems
been devised to build the lower portion of the reinforced concrete structure on land and launch it into the sea as a While floating it will be floating body. built up to a height of about 28" and The frameworks of the main buildings after the excavation has been carried out and the turbine and boiler rafts will be to the correct depth, it will be sunk in carried on over 400 Vibro piles, some of position by means of flooding so that it which will have to be driven to a depth comes to rest with the intakes in line of go' below ground level where they with the existing Sea Wall.
The Pump House comprises 6 inlet chambers with band screens and will ac- commodate 6 pumps each of which will deliver 27,000 gallons per minute of Condensers. The
will rest on bedrock. English Electric Company, as main contractors, are co-ordinating the The problems involved generally in the whole contract through their General foundation work have been greatly ag Engineering Projects Department and gravated by the presence of a Sea Wall, are supplying the steam turbo-alterna- which formed the limit of the previous cooling water to the tor set, generator transformer and all reclamation and which now lies buried other electrical and auxiliary equipment, directly under the new Turbine House. Main sub-contractors are Messrs. Babcock This wall is built on a rubble bund which
superstructure of the building will be in reinforced concrete and an overhead tra-
& Wilcox, Ltd., who are supplying the extends to a depth of 26 below ground velling Crane will be installed.
boiler plant, Messrs. British Insulated level and it is about 60' wide at its Callender's Cables, Ltd. for all cables and base. cabling, and Messrs. George Wimpey & Co., Ltd.. who are carrying out all the civil constructional work including the power station buildings, foundation work,
etc.
Plant
The Plant which is being used for It will therefore be necessary to sink sheet piled shafts through this old wall be chosen carefully as working space on the carrying out the civil work has had to and, after removing the boulders in the site is extremely restricted. Two Derrick bund, backfill the shafts with a soft ma- Cranes, one of 15 tons capacity and the terial through which the Vibro piles can Site
other
have been preparations have already been be driven.
of 7 tons capacity. As the water level of the commenced on this scheme by Messrs. site varies with the tide between 6' and
erected on bogies so that they may travel George Wimpey & Co., Ltd. Owing to 14 below existing ground level, a great
on either side of the main building. These the rapidly increasing demand for power deal of the work will have to be carried
Derricks
can have 120 long jibs and
The on the Island, it is hoped to get the new out under water.
cover the whole area of the work. plant into commission in early 1959.
Cranes will be used for driving the sheet pile shafts through the old Sea Wall. grabbing out the Pump House excavation. placing of concrete in the foundations and erection of the structural steel work.
The project as a whole, taken in con-
Superstructure
junction with the necessary additions The frame of the main buildings will
to the
distribution system, should be be in structural steel work and will vary
Looking eastward across the site showing preparatory work in progress.
Concrete on the job, which amounts to 6.500 cubic yards approximately, will be weighbatched and mixed in electrically driven concrete mixers It is estimated that more than 550 tons of reinforcing steel will be used in the foundations and other concrete work.
As already mentioned a great deal of the work will be carried out below water level and therefore considerable pumping capacity has been allowed for in the plant being brought on site. In adli- tion a set of well points will be used when construction of the Cooling Water Culverts is in progress, and divers will be employed in various phases of the work.
In
view of
Programme
the foundation problems involved, it will be over a year
before
work on the Superstructure commences and it is anticipated that the new build- ings will be complete by the middle of 1958.
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