LDI 2004 Product of the Year – Rigging and Hardware
Total Structures is pleased to offer the new Ballast Truss for use with delay towers and roof structures.
The truss is designed to hold three plastic tanks that each holds 100 gallons of water. The truss measures 31" x 31" and is 11 feet long and fabricated with 2" x 3/16" main chords and 1 ½" x 1/8" diagonals. Each three tank truss provides over 2500 pounds of ballast.
The tanks are placed on square box section bearers that span between the bottom chords of the truss and are secured with channel members on top. The tanks are filled and drained via the large diameter holes on the top surface and smaller diameter holes around the base respectively.
The trusses are provided with four integral screw jack positions for easy levelling. Typically four trusses are bolted to a corner block that is fabricated with top plates to accept a tower hinge.
The four Ballast Trusses shown above enable the self-contained 50 ft high delay tower to be raised and lowered. The delay tower is guyed to the ends of the ballast trusses to transmit the wind forces on the PA down to ground level without inducing high bending stresses in the towers.
A similar arrangement can be used to provide ballast at tower bases on an outdoor roof structure.
The truss is designed in accordance with ANSI E1.2 standard and as with all equipment manufactured by Total Structures, the new Ballast Truss elements are fabricated by Certified Welders and are subject to a stringent quality assurance procedure.