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A MODULAR LIFT CORE BASED ON PANELS OF BI-STEEL

METALWORKS WORKING DETAIL

For Dundrum Cinema, the fast-track lift core was assembled on site from four modules prefabricated from bi-steel panels. These panels comprise two 8mm steel sheets, 200mm apart, with connecting bars at 320mm centres.

Panels were delivered to local fabricator Fisher Engineering. Module assembly included attaching fin plates and shelf angles for connection to the building's steel frame and supporting composite floor slabs. Brackets to support lift guide rails were fitted off site.

The lift shaft comprises four similarly sized modules to facilitate transportation to site and make best use of site crane capacity. The shaft is 2.4m x 3.3m on plan and 24m high.

The largest module is 12.4m high, weighing 17 tonnes.

Vertical on-site connections between two modules consisted of RHS sections with shear studs. Removable screw adjusters were set on top of the lower modules and the upper modules were lowered onto these, then they were adjusted to ensure continuity of vertical alignment between lower and upper modules. Once adjusted, horizontal joints were bolted (using Surefast bolts) and cover plates welded on.

A temporary platform was installed on top of the modules for safety during concretefilling, which used pumped concrete delivered through Tremi pipes.

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