maximum practical size modules - units to be launched for subsequent 
assembly at sea - and structural elements that make up the modules 
depend on such state-of-the-art factors as fabrication techniques, 
materials of construction, materials handling equipment and assembly 
methods. This report documents results of the preliminary investigations 
into the fabrication of various configured concepts and notes areas 
where further RDT&E efforts are warranted. Also included is a history 
of concrete structures in a marine environment. Based on operational 
analyses, three platform sizes were investigated:~ 300 x 300, 400 x 
1200, and 1000 x 4000, with dimensions given in feet (Figure 1.3). 
Various configurations of three basic types were considered, (a) elevat- 
ed decks on columnar, vertical supports for providing buoyancy, (b) ele- 
vated decks with semi-submersible type horizontal hulls and (c) elevated 
decks with barge-type hulls for floatation. 
By definition, the construction process is basically in four stages, 
as illustrated in the below diagram. 
Intermediate 
products 3 Sections mS Platform 
Elements 
Intermediate products, or elements, are major precast units that go to 
make up modules, the smallest units to be launched. The modules, are 
then assembled at sea into sections, and these in turn into the plat- 
form (See Figure 1.4). Requirements on size, configuration and deploy- 
ment may dictate a final design where either of the intermediate stages, 
modules or sections, may be unnecessary. Reference is made to these 
four stages of construction throughout the report in context with the 
above definition. 
sk 
Joint laboratories report on mission analysis (1970), in preparation. 
1-4 
