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11 February 2014

A pair of heavyweights

Laing O’Rourke’s team delivering the Northern Water Treatment Plant for QGC has achieved an important milestone, completing the two largest lifts in the construction programme.

The Northern Water Treatment Plant, near Wandoan - northwest of Chinchilla, Queensland - recently achieved an important milestone by performing the two largest lifts in the construction programme. The clarified raw water pump station, one of the project’s main feed pump stations, was lifted to its final resting place in two parts.

Designed by Laing O'Rourke and sitting atop a 13.5-metre-high precast concrete structure consisting of columns and shell beams, the pump station will use submersible pumps to feed 100 megalitres of water per day to the main plant. It is connected to dry land via a 50-metre-long bridge structure, which was completely modularised in Laing O'Rourke's customised 'Design for Manufacture and Assembly' (DfMA) process.

Laing O’Rourke’s Redispan manufacturing facilities in the NSW Hunter Valley provided the gantry assembly in modules, which were constructed outside the feed water pond after delivery to site. The main superstructure was also assembled outside the pond footprint. This methodology provided better access for the construction team and materials and made the assembly area less susceptible to bad weather events.

The new assembly location, however, meant that the NWTP team was now faced with a 45-tonne lift at a reach of 68 metres. Laing O'Rourke's Select Plant teams provided the solution in the form of the Terex/Demag CC2800-1 crane, which has a lifting capacity of 600 tonnes. With the addition of superlift counterweights of 200 tonnes, this crane was capable of performing the lifts of both the pump house and the bridge gantry.

It was also possible, with the help of an on-site draftsperson and a detailed 3D model, to not only plan locations of crane, construction and laydown pads, but to also simulate the construction sequence before lifting took place.

Laing O'Rourke continues to use the latest Digital Engineering techniques, and specific Design for Manufacture and Assembly practices - alongside our own plant and direct delivery workforces - to provide clients with the safest, most reliable delivery on site.

NWTP Raw water pump station liftsLaing O'Rourke performs the two largest lifts on the Northern Water Treatment Plant programme
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