Transactions of the American Society of Civil Engineers, vol. LXX, Dec. 1910 | Page 4

most rigid
foundations, these caissons might readily be used as substitutes for
open wooden caissons, sunk on a prepared foundation of whatever
nature, and still be capable of incorporation into the finished structure.

DISCUSSION
WILLIAM ARTHUR PAYNE, M. AM. SOC. C. E. (by letter).--On the
arrival of the first barge load of brick, to be used in building a residence
on the estate to which this pier belongs, a severe northwest wind blew
for two days, after the boat was moored alongside, directly against the
head of the pier and the side of the boat. The effect on the pier was to
crush the fender piles and cause a settlement of one of the caissons at
the pier head on the west end. The caisson was knocked slightly out of
alignment, and a settlement toward the west was observable.
The writer believes that this was caused by the pounding of the brick
barge on the sand bottom on which the caissons rest, during half tide,
the boat being raised from the bottom on a roller, and striking when the
roller had passed. In order to protect the pier and avoid the bumping of
barges against it, three groups of piles were driven about 8 ft. beyond

the end, a secondary platform was built between these and the stringer
of the pier, and arranged so that it would slide on the stringer in case of
movement of the piles. This secondary platform is particularly
advantageous in the handling of material, as the height of the dock was
found to be excessive for passing up brick and cement. For handling
material after it is deposited on the dock, an industrial railroad has been
built. At the shore end of this railroad, brick and cement are dumped
into wagons, in which they are carried up the hill to the house.
EUGENE KLAPP, M. AM. SOC. C. E. (by letter).--The injury done to
the piers, as reported by Mr. Payne, is not to be wondered at. The pier
was primarily built for a yacht landing, and, on account of the shoal
water conditions, excepting at extreme high tide, it was mostly to be
used by tenders and launches from larger yachts. It was thought that at
high water the large steam yachts might be able to come alongside.
Provision was not made for tying up to the dock a heavily loaded brick
scow and allowing it to remain there through rough weather.
The building of the secondary fender piles, during the temporary use of
the dock for unloading building material, will doubtless prevent further
damage.

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