8.45 one end of the colony is sealed, any large structure is moved inside and secured in place,and work is begun on the interior structure of the colony. The docking port and permanent power plant are assembled and temporarily attached to the frame adjacent to their final position in the colony. When work on the hull is completed, the frame is disassembled in the area of the docking port and power plant attachments and these two items are incorporated into the structure. The colony construction site equipment is moved off a safe distance to await future use or incorporation into the permanent manufacturing facilities. Spin-up and pressurization are begun (see Section VIII.8.1) and eventually an overspin and overpressurization proof tests are carried out to ensure the structural integrity of the structure. The spin-up and proof tests add three months to the five years of on-site construction. Eight to nine years after the first men and equipment arrived at the location, the colony is ready for the installation of agriculture and inhabitants. VIII.7.4: Design of Construction Site Structure: Calculation of costs involved in the construction site requires estimates of the masses and power consumptions of the cranes, frame and mast, work shacks, living quarters, booms, and solar-cell array. These mass and power estimates are tabled in VIII.9.2. The mass of the construction shacks and equipment has already been estimated in Section VIII.6.2. The mass estimate for the photovoltaic array is based on a mass to power ratio of 10 kg/kW (Woodcock and Gregory (8.13) predict 6.9 kg/kW by 1985) and the total power requirement of the construction procedure. Estimating the masses of the space truss structure and the living quarters requires a preliminary design. The only structural loads imposed on the truss structure are the dynamic inertia loads associated with transporting large pieces of the hull during assembly (Section VIII.7.3.2). The maximum acceleration ever applied to a section during handling is assumed to be lm/sec 2 . A 20m x 20m hull section which has a mass of 100 tons produces a reaction load of lxl0 5 N when accelerated at lm/sec 2 .
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