The Cotai Strip development currently under construction in Macau is modelled on the Las Vegas strip. Central to the development is ‘The Venetian Macau’, which will contain a 3000 suite hotel, 22 restaurants, 50,000m² of gaming facilities, over 1,300,000m² of convention and meeting facilities, a 15,000 seat centre suitable for sporting events, concerts and entertainment, a 2,000 seat theatre, a health spa, and retail space.
The 900te theatre roof structure consists of 14 main trusses, each spanning approximately 56m. The ends of the steel trusses are supported on concrete corbels which cantilever out from the slender concrete walls.
DLT have developed an erection method in which the roof structure is pre-assembled at ground level enabling the roof cladding and services to be installed at low level. The structure will be lifted into final position in three separate lifting operations. The first lift will erect the 4 trusses that cover the fly tower area of the theatre; a total weight of 400te. The second and final lifts will erect 5 trusses each, completing the lower section of roof over the auditorium.
Prior to lifting each section of roof, additional temporary members are installed to ensure that stability is maintained whilst the structure in being lifted and until the permanent connections to the concrete corbels and walls have been made.
The sections of roof will be lifted using up to 10 No DL-C125 climbing jacks. A climbing jack will be positioned at each end of each truss. The climbing bars for the jacks will each be clipped to a restraint tube that is temporarily connected to the face of the concrete wall. The climbing jacks will be operated and monitored using our DL-P40 jacking control system.
A climbing jack will be positioned at each end of each truss. It will lift against a temporary extension beam which is cantilevering out the end of each truss. When each section of roof structure has been lifted to its final position, infill members will be connected between the end of the truss and the permanent bearing plates previously cast in to the concrete wall. The load will then be released from the climbing jacks.
The erection of the roof is due take place in Q1 2007.