Reference Project
Construction Engineering
Site Services
In July 2015 Dorman Long Technology were awarded the contract by main contractor Daelim-Swee as the suppliers of a 2 x 870 tonne capacity bridge deck erection gantry for the Temburong Bridge Project in Brunei. The gantry will be used to simultaneously erect two 50m long 870 tonne precast concrete bridge deck girders, and is believed to be the first ever bridge erection gantry of this type. It will be used to erect all bridge deck girders on a 13.65 km long marine viaduct across the Brunei Bay that will link the regions of Brunei Muara and Temburong. The gantry will be delivered in April 2016 and is expected to be in operation on the project for 2 years. This new type of gantry provides a fast and economic solution for the erection of twin deck marine viaducts where the water depth along the length of the bridge is sufficient for barge delivery of the deck girders. The gantry is designed to erect viaduct sections that are up to four decks wide in some sections at an erection rate of up to one bridge span per day.
The gantry uses DLT strand jacks for lifting for improved safety and to reduced gantry weight when compared to a conventional winch system. Our strand jacks incorporate a stroke synchronised slow bleed lowering system, allowing the two bridge girders to be carefully lowered onto the bearings for a smooth and balance load transfer, Transverse movement of the deck beams after lifting and forward launching of the gantry are achieved using DLT pinned climbing jacks. The gantry has three legs and uses an innovative launch sequence to avoid placing heavy loads on the deck beams away from the piers when the gantry moves forward into the next span. The gantry hydraulic systems are centrally monitored and controlled using our DL-P40 computer control system.
