Engineering Wonders of the World
Volume I
År: 1945
Serie: Engineering Wonders of the World
Sider: 448
UDK: 600 Eng -gl.
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FLOATING DOCKS. 413
docks owing to its form, can be readily con-
first example built being the large dock for
structed in places where it would be prac-
the Spanish Government, and intended for
use at Havana.
SYSTEM OF SHORE ATTACHMENT.
BOOM
PONTOON
Fig. 5.
OF AN OFF-SHORE DOCK.
WEIGHTS
END ELEVATION
An interesting detail at A is shown in the small
sketch on the right. An upper boom is attached
at its landward end, not rigidly to the upright
shore girder, but to a weighted crank, which
allows th,e dock to take a small inclination in
either direction. By watching the movements of
the weights, the man in charge
is enabled to correct the triin of
the dock, and avoid undue strains
on any part of the structure.
(By courtesy of Messrs. Clark
and Standfield.)
In
the
this type
side walls
increased in
The Havana
Type of
Dock.
are
depth by extending them to
the bottom of the pontoons,
the latter being bolted to the
(By courtesy
of Messrs.
Clark and
Standfield.)
Fig. 6.—ELEVATION OF AN OUT-
RIGGER DOCK.
tically impossible to complete a dock of any
other description. The pon-
Sectional toons are easily erected and
Pontoon
Docks. launched separately, after
which the walls can be erected
in place on the pontoons. (See Fig. 7a.)
In order to obtain greater longitudinal
strength than in the sectional pontoon type
of dock, the Havana design was evolved, the
(ä)
sides instead of to the under edge of the
walls. The pontoons are usually three in
number, one in the centre and one at each end
of the dock’s length. (See Fig. 76.) Another
example of the Havana type is the Bermuda
dock.
The last-named dock, built by Messrs. Swan,
Hunter, and Wigham Richardson to the order
of the British Government to meet the grow-
ing demand for docking accom-
modation at Bermuda, may be
described some-
what in detail, The Bermuda
. Dock.
as it ranks
among the finest floating docks
at present in existence. The
Admiralty stipulated that the
structure should be capable of
lifting battleships of 16,500 tons
displacement, first-class cruisers
Fig. 7.—DIAGRAMS OF TWO-WALLED DOCKS.
(a) Sectional pontoon dock, (b) Havana type, Mr. Lyonei E.
Clark’s patent. Pontoons can be raised up side walls for self-locking,
(c) Bolted sectional type, (d) Bolted sectional dock, self-docking
the central section.