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Steel
deckhouses - The midship structures of the Boat, A and B Decks were all
considered deckhouses. The structure on B Deck from the forward Well Deck to the after
Well Deck was called the “B Deckhouse;” the passenger accommodation on A Deck
occupied the “A Deckhouse.” This deckhouse enclosed the complete internal area
surrounded by the promenade, but excluded the same. The Boat Deck contained deckhouses
divided by open space. These deckhouses were framed and sheathed with steel, with the
exception of specific areas where wood was required. The majority of the steel deckhouses
were built before Titanic was launched from her construction berth. Some of the
deckhouses on the Boat Deck, however, could not be erected until after the machinery was
shipped. These deckhouses remained only partially completed until after the ship was moved
to the Fitting-Out Wharf and the engines, boilers, and other machinery had been hoisted
aboard and lowered into the ship. In addition, the wooden deckhouses were not constructed
until the ship was at the Fitting-Out Wharf . . . (continued) |
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Image above, Expansion Joints - Various Sectional Details - Illustration by Bruce Beveridge based on original H & W
Expansion Joint plan. |
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Expansion
joints - The expansion joints of Titanic can be likened to the expansion
joints used in large highway and motorway bridges today. Though different in construction,
they serve the same purpose - to compensate for shifting of the connecting structures when
under straining forces. (The principal straining forces alluded to here -
“hogging,” “sagging,” “racking” and “torsional
stresses” - are individually defined in the glossary.)
Titanic was fitted with two expansion joints, one at frame 49F and one at frame 28A.
As stated previously, the decks comprising the superstructure were not designed to be
integral to the structure of the hull, B Deck being the uppermost portion of the hull
girder. The expansion joints started within the deckhouse bulkheads immediately above the
B Deck level and effectively subdivided the superstructure into three separate entities .
. . (continued)
On the Boat and A Decks, beneath each of the expansion joints a leather strip
having a thickness of ? inch and covering an area of 9 inches wide was mounted the
underside of the deck. Each of these leather strips was held firmly in place beneath along
the forward and after edged of the joint it covered by 1¼? x ?? galvanized-iron strips
running the entire length of the joint, fastened at 4-inch intervals with 5/16? diameter
screws. The leather strip was made to be . . . (continued) |
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Navigating
Bridge shelter - The Wheelhouse and the Navigating Bridge shelter were unique
because, unlike all of the other deckhouses on the ship, these structures were built
entirely of wood. Wood construction was most suitable in the vicinity of the compasses as
steel had a magnetic attraction on the needle; hence, it was general practice to avoid
placing any steelwork within a 10-foot radius of the compass. All metal fittings and
fasteners were of brass or bronze due to their non-magnetic properties.
The Wheelhouse and the Navigating Bridge shelter were made of heavy timber frameworks with
lighter secondary framing to fill in the spaces. The primary framing was composed of stout
wooden coaming pieces which were bolted to the steel deck. Vertical “standards”
were stepped upon the coamings at regular intervals . . . (continued) |
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