Hanson IGS Sydney Precast PDF

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Hanson_ International Grammar School Project

File: Hansen_IGS_Sydney.ppt

27/07/2018

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Hanson_ International Grammar School Project

27/07/2018

The new four storey primary school library and multi purpose hall for the International Grammar School at Glebe in Sydney is a classic example of a total precast structure.

File: Hansen_IGS_Sydney.ppt

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Hanson_ International Grammar School Project

27/07/2018

The architect Michael Heenan, principal with Allen Jack + Cottier who had previously used Hanson Precast on the international award winning project Sport and Recreation Hall in Berry NSW, wanted to explore more possibilities with this building. Environmentally sustainable principles were incorporated in the design with the precast contributing 3 green star points. The building, part of the BER program, also needed to be delivered within strict time and cost parameters.

File: Hansen_IGS_Sydney.ppt

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Hanson_ International Grammar School Project

27/07/2018

The erection of the precast elements needed careful planning as all

.

the usual site conditions of an inner city development applied

File: Hansen_IGS_Sydney.ppt

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Hanson_ International Grammar School Project

27/07/2018

It was decided to erect the building in 2 stages with the rear section of the building that included the lift, curved stairwell, rear walls and a small section of the flooring erected first.

File: Hansen_IGS_Sydney.ppt

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Hanson_ International Grammar School Project

27/07/2018

Precast concrete element were manufactured by Hanson off site and delivered as required to match the on site erection sequence.

File: Hansen_IGS_Sydney.ppt

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Hanson_ International Grammar School Project

27/07/2018

Think about the planning and co-ordination that has gone into this installation. How do you allow for these in your estimate? What co-ordination is required? Who are the agencies/groups involved?

File: Hansen_IGS_Sydney.ppt

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Hanson_ International Grammar School Project

27/07/2018

Precast concrete was used for the external walls of the building, the walls of the liftshaft and the curved walls of the stairwell.

File: Hansen_IGS_Sydney.ppt

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Hanson_ International Grammar School Project

27/07/2018

300 thick hollowcore floor planks clear spanning almost 13 metres onto the external loadbearing precast walling were also selected.

File: Hansen_IGS_Sydney.ppt

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Hanson_ International Grammar School Project

27/07/2018

In all there were 128 precast elements manufactured for the project.

File: Hansen_IGS_Sydney.ppt

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Hanson_ International Grammar School Project

27/07/2018

A 50 tonne mobile crane located within the site was used for the 4 separate visits.

File: Hansen_IGS_Sydney.ppt

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Hanson_ International Grammar School Project

27/07/2018

The curved off form off white stairwell panels were cast from purpose built moulds for the project.

File: Hansen_IGS_Sydney.ppt

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Hanson_ International Grammar School Project

27/07/2018

The temporary bracing of the precast was critical during this stage as there wasn’t any insitu structure to brace the panels

File: Hansen_IGS_Sydney.ppt

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Hanson_ International Grammar School Project

27/07/2018

Note the two storey high lift shaft panels.

File: Hansen_IGS_Sydney.ppt

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Hanson_ International Grammar School Project

27/07/2018

Note rotation of the Precast wall panels: Students to describe safe work practices (above and at ground level). 1.

Use of props

2. 3.

Spotter at left on ground Cherry picker to disconnect lifting chains.

Any unsafe practices? Men at base whilst cherry picker operating above.

File: Hansen_IGS_Sydney.ppt

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Hanson_ International Grammar School Project

27/07/2018

The temporary bracing on stage 1 was kept in place until after the stage 2 elements were erected and the concrete topping to the planks was poured. A concrete topping to the 2 floor planks cast with the insitu landings helped to tie the elements together.

File: Hansen_IGS_Sydney.ppt

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Hanson_ International Grammar School Project

27/07/2018

The manufacture of the 12 large Nawkaw stained external sandwich panels for the two street elevations with fourteen amorphous holes in each panel was a challenge for the precaster, Hanson.

File: Hansen_IGS_Sydney.ppt

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Hanson_ International Grammar School Project

27/07/2018

The 14 holes in each panel needed to have a rebate for the fitting of external glazing and to have an acceptable of-form finish for the Nawkaw staining. Forming of the random shape and sometimes large holes was achieved by using complete rubber liners cast off timber patterns. The insulating layer needed to be profiled around the holes prior to the casting of the two layers of concrete.

File: Hansen_IGS_Sydney.ppt

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Hanson_ International Grammar School Project

27/07/2018

Special consideration was undertaken by the architect to select a colour and texture for the exterior walling to compliment the historical brick buildings in the surrounding streets. A burnt terracotta finish with a replicated scattered iron spot that added a metallic lustre to the panels was chosen. The Nawkaw 3 stage staining process needed to be applied in the precast factory to allow the technician the best environment to achieve the finish that gave a texture that would reflect light differently.

File: Hansen_IGS_Sydney.ppt

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Hanson_ International Grammar School Project

27/07/2018

Note careful handling required to avoid damage to the panels in transit.

File: Hansen_IGS_Sydney.ppt

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Hanson_ International Grammar School Project

27/07/2018

Macarthur street was closed to traffic with police and traffic controllers located at each end of the street to control local traffic and pedestrians.

File: Hansen_IGS_Sydney.ppt

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Hanson_ International Grammar School Project

27/07/2018

The second stage erection of the 16 tonne amorphous stained wall panels that needed to be placed nearly 20 metres from the crane required a 300 tonne mobile crane to be located in Macarthur Street. The rear wall panels and the floor planks in stage 2 were also erected with the 300 tonne crane.

File: Hansen_IGS_Sydney.ppt

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Hanson_ International Grammar School Project

27/07/2018

Note temporary erection props supporting floor panels on lintel prior to positioning next wall panel.

File: Hansen_IGS_Sydney.ppt

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Hanson_ International Grammar School Project

27/07/2018

After 8 days the erection of precast elements on this unique building was completed. Note propping and connection of lintel to wall and floor panels. Why are the props still in place? When should they be removed? What other works will be needed to complete this project? • Concrete (in-situ), Electrical, Plumbing, HAV, Lift, Glazing, Painting etc.

File: Hansen_IGS_Sydney.ppt

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