Monday, March 20, 2006

Trussing & Motors

Again, this entry is primarily to build shipping data.
trusses - 12K#
hoists - 5K#

The performance structure consists of 4 29 m. (95') tower structures, joined at the base by a steel i-beam structure and at the top by an aluminum truss structure containing the motor hoist system and catwalks. The overall performance structure, with base, lightning rods and tension cables, will be 120' tall.

Trusses joining the towers wil be 80' spans of composite truss - a 36" tall x 24" wide top truss attached to a 12 x 12 (or 12 x 18) truss below via alum pipe and swivel clamp. By joining the two trusses, load capabilities are increased to 7000# per truss UDL (uniform distributed load).

4 - 80 spans 36 x 24" 6061 truss. 1600# per section, 6400# total
4 - 80 spans 12 x 12" 6061 truss. 640# per section, 2540# total

bracing -
64 - 10' crossbraces - 640' x 1.5#
64 - 14' crossbraces - 896 x 1.5#
256 clamps x 1.5#
total crossbracing weight - 2700#

Trusses and cross-bracing - 11,700#

Split up among the steel containers, trussing should add no additional containers to the performance structure.

CM chain motors may be available in China, although availability is uncertain during the Olympics. Up to 42 hoists are required. Requirements call primarily for 0.5 kg or less in capacity. With 85' chain drops, .5kg hoists will weigh about 100#. Total hoist weight will be approx. 4800# with spares, less cable. Container space will be 6' x 8' stacked 3 cases high. We will bring a total of 48 hoists, with 6 spares. I'll be designing a custom power and control cable distribution system to reduce cable runs. Nearly all hoists will be top mounted, further reducing cabling requirements.

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