CHAPTER If, SECTION 1
further modification of prepared design drawings for adaptation to the new location.
The Service Tower, Station 6001, as first
designed for Site How was a 90-foot-high, cor-
rugated metal-covered, steel-frame structure, 24
feet square in plan, and was mounted on steel
wheels for mobility on tracks. When this tower
was later constructed at Johnston Island, the
roof structure, sliding door, and tower siding
were omitted and the foundation was redesigned
to minimize procurement and construction time.
The basic design problems were to provide a
structure meeting the User’s several detail requirements: stability in motion in a 30-mph
wind; resistance to a wind pressure of 30 pounds
per square tuot when in fixed anchored position;
provision for a system to move the standing
Station 2250 at Site Sugar was the first
requirement for a non-expendable, blast-resist-
ant, steel, guyed tower structure at EPG. Essentially, the station tower was a 150-foot tower
guyed at the top level and made up of 25-foot
segments of a standard 300-foot shot tower de-
veloped for EPG. An unusual aspect of Station
2250 was that it was supported at its base on
the roof level of the Room D addition to existing
Station 2200; this was also the first time at
EPG for the erection of a significant steel tower
upon a Scientific Station structure roof.
The IBM Building, No. 453, designed to
house a model 707 IBM computer system, was the
first fireproof re-inforced concrete office build-
ing to be constructed at EPG. The structure was
structure to and from the firing and parking
pad; ability to enclose the standing missile on
all sides; and stability in resisting overpressures
from the first events in Bikini Lagoon with the
metal siding removed. The problem when first
confronted seemed overwhelming and of doubtful feasibility because of the great size of the
structure. Design was not particularly difficult
from the engineering standpoint, but problems
arose as a result of the unusual details for hinged
platforms at tower work levels, tower tie-down
anchors at the parking and firing pads, concrete
counter-weights at the lower platform level, and
the towing system rigging and winch.
Pinex-type Barge Zero Stations were an
entirely new type of barge modification develop-
ment. The general configuration of the deck
structure details, underwater collimating pipe,
and access caisson were as suggested by the
Users. The main design problems werein selecting design and details for an adequate and feasible bracing system support of a long, large-
diameter, steel pipe below the bottom of the
hull, the vertical removable steel caisson for
access to the underwater lower end of thecollimating pipe, and a multitudeof details for underwater connections and water-tight joints.
The barge facilities at Site Nan were more
in the order of an unusual facility rather than
a difficult design, once the over-all general planning concept was determined. The design objective was to provide two quiet-water, barge-mooring slips for outfitting shot barges. The gate
construction to prevent water level surge in the
two basins was the basic problem. The under-
water gate sill construction initially suggested
an obstacle, but this was surmounted by plan-
ning to drive steel sheet-piling, cut-off walls
topped with a level steel section. This was later
revised during the construction period to provide
a prefabricated sheet-pile, cut-off wall section
lowered into an underwater excavation, back-
filled and tied off by wire rope.
Page 44
(Neg. No. W-V-243-5)
Figure No. 2-3.
Caisson Installation on
Pinex Type Barge.