XN000022-1972-07-03 — Page 13

Monday, July 3, 1972

Particular problems in addition to those mentioned, included handling

and driving piles up to 90 feet in length between buildings not more than 95'

-

Of apart whilst working above a canal approximately 401 O" in width; prestressing

support frames with pulls of up to 200 tons, working to within a few feet of

existing buildings which had to remain occupied; placing up to 400 tons of

concrete in single pours, above ground areas which had to be kept open for the

public; lifting and placing beams 75'-0" in length and in some instances

weighing as much as 38 tons, again within the restricted site area and above

the canal. A maximum clear span of approximately 110' O", was constructed

above Hennessy Road which could not be obstructed in any way during the daytime.

The contract was successfully completed by April 1970 within the specified 25

months period at a cost of HK$4.9 million.

Circular

OFF,

The Canal Road Flyover Extension was constructed to provide a connection

between Canal Road flyover and Waterfront Road. Within a short time of work

beginning, however, a decision was made to proceed with the Cross-Harbour Tunnel

and the scope of the contract was therefore revised.

A particular feature is the circular shape of the major flyover, which

is dictated by the very restricted area of site available for the whole of the

interchange. This posed problems when fitting the heavy precast beams within

the circular flyover deck; nevertheless other advantages accrue from the use

of precasting and in this instance it was combined with an insitu concrete

deck-slab and edge detail to give the required shape.

/In conjunction