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Contractors World

 
Contractors World - INTERNATIONAL
The free digital publication for
construction, demolition, mining and quarrying industries.

 

Contractors World International- 2017 Vol 8 No 1


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ROAD & BRIDGES

The first bridge decks have been successfully installed on the CC2 section of the new Temburong Bridge in Brunei. The bespoke gantry simultaneously lifts pairs of full span precast decks from barges into position on the pier heads. Each bridge deck is up to 50 m long and weighs up to 870 tonne.

Brunei
Temburong Bridge

First bridge decks lifted on Temburong Bridge, Brunei.

The first bridge decks have been successfully installed on the CC2 section of the new Temburong Bridge in Brunei. The bespoke gantry simultaneously lifts pairs of full span precast decks from barges into position on the pier heads. Each bridge deck is up to 50 m long and weighs up to 870 tonne.

Hewson are the Independent Checking Engineer for the gantry, which was designed and fabricated by Dorman Long Technology, for main contractor Daelim-Swee.

Dorman Long Technology are the designers and suppliers of an innovative 2 x 870 tonne capacity bridge deck erection gantry for the Temburong Bridge Project in Brunei, to main contractor Daelim-Swee.

The gantry is used to simultaneously erect two 50m long 870 tonne precast concrete bridge deck girders, and it is believed to be the first ever bridge erection gantry of this type.

The gantry erected the first pair of bridge girders in January 2017 and is expected to be in operation on the project for 2 years. The gantry is designed to erect viaduct sections that are up to four decks wide in some sections at an erection rate of one bridge span every 2 shifts.

This new type of gantry provides a fast and economic solution for the erection of twin box marine viaducts, and removes the need for over deck delivery from a transfer gantry or from a casting yard at the end of the bridge.

The casting yard can therefore be located anywhere in the region with water frontage and the viaduct can be constructed in separate sections without the need to provide a continuous line for over deck delivery.

The gantry uses DLT strand jacks for lifting for improved safety and to reduced gantry weight when compared to a conventional winch system.

The 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.

Dorman Long Technology

 

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