DG 1110.3.120
DESIGN GUIDE: MUSIC AND DRAMA CENTERS
JANUARY 1981
CHAPTER 4: RIGGING AND STAGE MECHANISMS
F I G U R E 4-3.1
G R I D I R O N RIGGING
made behind it while the variety act is in prog-
1. Fly-Loft Components
ress. It is functionally much like the optional Per-
Scenery, drapes and lights are moved vertically
formance Curtain, but hangs eight to twelve feet
by a system of lines, pulleys, counterweights
behind the House Curtain. Frequent use of a
and/or winches supporting a pipe, all of which
movie projection screen suggests a position in
constitute a set. Sets are supported on a struc-
front of the teaser and Performance Curtain.
tural grating, the gridiron, above the stage and
fixed in place at a pinrail or locking rail anchored
Accessories: Typical accessories in the soft
to the stagehouse wall, floor, or fly gallery. Grid-
goods include storage bags and demountable
iron is positioned to allow man-high working
traveller tracks.
space below the roof structure. Loft beams com-
prised of 10 inch steel channels extend the full
depth of the stagehouse in pairs, providing a
cable slot every 10 or 12 feet. The grid floor nor-
mally consists of 1" x 3" channel steel laid web-
4-3. RIGGING AND STAGE
up 6" on center, or 1" subway grating. Individ-
MECHANISMS
ual lines can thus be dropped through almost
anywhere on stage. At one end of the stage-
house, major head block beams resist the lateral
and vertical loads imposed by the sets.
A. COMMENTARY
Line sets consist of two or more rope or wire
cable lines attached to each flown unit as it rests
The Room design implications of scene handling
on the stage floor. The lines run up over move-
devices and their basic purpose is noted in sec-
able loft blocks mounted on the loft beams;
tions 3-6, 3-8 and 3-9. Selection of systems is
blocks shift up and downstage for adjustment.
based on anticipated performance uses.
Individual (single) rope lines may also pass
through the grid floor. The lines of each set are
4-9
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