Discussion in 'Scenery, Props, and Rigging' started by Shawzborne, Jul 4, 2012.
What is meant by a guideline cable(s), and where would they be located?
Your question is a touch vague, lots of possible answers, but, I'll give it a try.
A guide line cable would refer to a gable used to guide/control/contain the movement of a wire guide counterweight arbor or the edge of a wire guide fire curtain. The counterweight arbor guide(s) there are two per arbor, are located at the front and rear of the arbor and run from tie off points at the floor/rail to the headblock/grid. Fire Curtain guides are located at the back, inside of the smoke pocket. Usually anchored to the floor with an eye plate and run to the grid where they are anchored to the building steel with chains or brackets or eye bolts.
However, did you mean "GUY" line cable??? If so, guy line is a tension bracing method for ground supported truss structures. It can be used around the perimeter or across areas needing bracing. For the perimeter, the guys are attached at or near the top edge of the structure and run down and out at an angle usually between 45 and 60 degrees. The lower end is attached to earth anchors, concrete Jersey barriers, water tank ballasts or similar multi-ton tie-off points. Guys are also used in pairs as tension member X bracing across the sides or back of structures. They are also used as horizontal X bracing at the roof level to resist torsion or twisting of the structure under various wind loading conditions. Tension on X braces, size of cable and load ratings of components, the amount of ballast weight or earth anchor rating and placement are different for each setup and must be determined by an engineer qualified to calculate the various loadings for the type and size of truss in question, for the particular setup in question. Additional wind load calculations are made for the elements that will be supported by the truss such as Show poster front scrims, side wind walls, the 15' x 20' LED video wall. For example, one of our roof structures that goes on a semi tomorrow for a week in Missouri has an 8 page engineering report from the manufacturer with pages of various wind speed and uplift conditions with wind from 8 quadrants, with the roof at various heights.
Anyway, that's it in brief. Hope I answered the question you were asking.
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