reclamation works, the area where the screen house stands, was thoroughly dredged to remove silt and stones, and refilled with selected cohesive soil. On completion of erection of the seawall and reclamation in the vicinity, the area under the screen house was exten- sively piled not only to provide the re- quired support for the structure, but to consolidate the freshly filled soil to the excavation.
Cofferdam
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A cofferdam measuring 150 ft. long and 80 ft. wide was formed with Bel- val BZII-N steel sheet piles driven to a depth of approximately 38.00 ft. Four rows of hardwood frames of 15 in. x 18 in. and 15 in. x 12 in. sections were constructed to hold sheet piles as excavation progressed.
Soggy pockets caused by seepage of seawater from beneath the sheet piles were effectively "frozen" by in- jecting rapid hardening grout from 12 ft. above the final level of excavation.
Excavation was brought down to its final level at — 22.50 ft. almost free of seepage of water and perfect work- ing conditions were attained for the reinforced concrete work when a 9 in. layer hardcore made of good concrete mixture was formed at the bottom of excavation.
Other component parts of the screen house, necessary for connecting with the sea, were precast on site close to the seawall, for lifting by means of floating cranes. The largest of these structures are the reinforced concrete intake culverts, each measuring 7 ft.6 in. x 11 ft. x 80 ft. long and weighing 202 tons.
001
FOLL
INTARE CULTERTS
T6
B
SUA
Plan of screen-pump chamber and culverts
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Cross section of screen-pump house
Far East BUILDER, October 1968.
-7-4′(13.8 MB)
PLANT
Θ
INTARE
CULVERTS
37