Piled Structure with Concrete-Block Seawall
7.21
Description. A piled concrete structure fronts the reclamation. The reclamation is retained by a conventional concrete-block seawall. The quay structure is a combination of precast and insitu prestressed and reinforced concrete supported on hollow circular prestressed- concrete piles.
„14.25′′
M.H.H.M. #7.10.
M-L·LM-42.0°
0.00°c 0.
HOLLOW CIRCULAR
PRESTRESSED CONC. PILES-|
APPROX. EXISTING SEA
BED
-35.0°
=40.0′____
CONTAINER=CRANE TRACK SOʻGAUGE
1 IN 100
SOFT
CLAY
-20.33′
SEA
WALL
RECLAMATION FILL
FILTER
STONE
RUBBLE
MOUND
- 40.0'
SAND
FILL
COMPACT
SOIL
SOFT CLAY
7.21
7.22 Advantages:-
(a) There is a small saving in fill as the face of the reclamation is 70 ft. back from the
wharf face.
(b) The amount of rubble that has to be carefully placed between piles is minimized. (c) The design incorporates a conventional concrete-block seawall well known to Hong
Kong contractors.
(d) Crane rail settlement is virtually eliminated.
(e) The cost is comparatively low.
7.23 Disadvantages:-
(a) The amount of soft material that would have to be removed is great in some places on the proposed quaywall alignment. Very deep dredging would therefore be necessary and a large volume of suitable sand fill, of which there is a scarcity, would be required. (b) Crane rail gauge must be decided at the design stage.
7.24 Order of Cost. From $8,500 to $11,500 per ft. run of berth depending partly on depth of
dredging and length of piles required.
7.25 Suitability. Particularly suitable where there is not too much soft material to be removed
from the seabed for the seawall foundation.
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