One of those is the 2,019-seat Concert Hall and although the venue was fitted with an adjustable acoustic canopy to ensure quality acoustics, a mock-up extension of the over-stage reflector was installed in August 2013 to improve acoustic performance of the extended stage area. A permanent extension is to be constructed in the future.
Macostar, a stage lighting and machinery system specialist in Hong Kong, was appointed to provide system engineering, detail design and construction of the new over-stage reflector and required a stage safety solution for the canopy's multi-point lifting structure.
Macostar selected Eilon Engineering's Ron StageMaster (RSM) 5000 multi load cell, a stage safety device for load control and overload prevention that can monitor hundreds of hanging points while providing a detailed report for statistical analysis. The RSM 5000 allows for a fast, easy and neat installation due to a single cable descending from the truss, and its small size allows for minimal head room loss.
"As we have predetermined hanging point locations for rigging an irregular truss structure on this project, the Eilon Ron StageMaster load cells help us to monitor the load balance among the chain hoists at two different positions," comments Francis Fung, VP of business development at Macostar. "It gives the users full confidence to operate the whole system under safe conditions."
Because the Ron StageMaster safety system is laptop-based with real-time monitoring, all loads can be monitored during installation and shows, indeed throughout every stage of the acoustic canopy's life. And for simple integration with the plot, the RSM system software allows for overlay of the load map onto the plot on screen, making it easy to see where motors, weight, etc. are on the plot.
The Concert Hall's 15m wide, crescent moon-shape acoustic canopy comprises a space frame made up of two layers of truss elements attached with reflector panels and lighting. The associated lifting devices of the canopy include eight new 1000kg steel frames and lifting hoists at the roof walkway, as well as 22m long lifting wires to support and stabilize the canopy. The allowable load of the new canopy (8,000kg) is four times that of the old system. Furthermore, the canopy is adjustable (7.5 - 12 metres) to ensure quality acoustics, fully covering the extended downstage area of the Hall's stage.
(Jim Evans)
