THE BUILDING BLOCKS
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PGH BRICKS & PAVERS IS TAKING A SUSTAINABLE APPROACH TO BRICK MANUFACTURING, REUSING CLAY SOURCED FROM METRO TUNNEL’S PARKVILLE STATION.
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lay material from Melbourne’s Metro Tunnel Parkville Station is estimated to weigh around 1.2 million tonnes. With the new Metro Tunnel expected to be ready by 2025, Parkville Station forms one piece of a significant puzzle that includes new stations and tunnel entrances at Kensington, North Melbourne, Parkville, Melbourne CBD, Domain precincts, South Yarra and West Footscray. Regular industry practice would see that material sent to landfill, but in the case of Parkville, a sustainable alternative has been developed that will see PGH Bricks & Pavers use the clay to create over 10 million bricks. Formed in 1958, after a merger between Hanson Consolidated Industries and Maxwell Porter & David Galbraith, PGH has grown to become one of Australia’s largest clay brick manufacturers. Work began at the Parkville site 14 January below Grattan Street, between Leicester Street and Royal Parade. Reusing clay material has obvious environmental benefits, but it will also take pressure off PGH’s main Thomastown quarry. As with all natural resources, at some point the clay runs dry. This forced the business to move to a new site, uprooting an established workforce, hindering 30
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businesses that work around the facility and creating rebuild costs. Andrew Peachey, PGH’s General Manager, says projects like this help to secure Australia’s manufacturing capability into the long term. “Normally we would extract this clay from our own quarry, so recycling material from construction sites also serves to provide longevity at our facility and continuity of work for everyone employed there,” Mr. Peachey says Ten million bricks from the Metro Tunnel saves 10 million bricks from the quarry and this safeguards the site into the future. “The longer we can stay at our existing facility is obviously good for builders because it keeps costs down for them. It also means we don’t have to go further out of Melbourne,” he says. “If we ran out of resources and couldn’t get anything at Thomastown, eventually we would be moving 10, 20, 30 or 50 kilometres out of Melbourne.” With the majority of construction in Melbourne happening in growth corridors in the north and the west, close to the Thomastown manufacturing facility, it’s in PGH’s best interests to keep the quarry maintainable for as long as possible. Mr. Peachey says that it’s fundamental to the sustainability of Australian
manufacturing. Parkville is not the company’s first foray into material recycling PGH took clay from Blackburn railway station during the underpass redevelopment and has used sandstone from various NSW infrastructure projects. It also has a history of using crushed bricks in mixes. Mr. Peachey highlights the importance of the project by citing concerns that greenfield sites are being built on potentially clay-rich areas, thereby sterilising resources. “The ability to get quality material from a large infrastructure project is quite important to the company,” he says. The mining process can be broken down to three stages. Stage one is a traditional mine, straight down with the use of station boxes. PGH National Raw Materials Manager Joe Gauci cites this as his preferred method, as material can be monitored more effectively, ensuring the best quality possible. Stages two and three, which are still to be tendered, will use a tunnel boring machine. Mr. Gauci says PGH will have to wait and see who wins those jobs before assessing the suitability of the material. PGH, working through a contractor, has been in the planning process for roughly 18
