JUNE 2018

City & SouthwestJUNE 2018BARANGAROO STATION

Excavation starts at the Barangaroo Station siteSydney Metro is Australia’s biggest public transport project. It will transform Sydney, delivering more trains and faster services for customers across the network.

Sydney Metro City & Southwest extends the new metro network from the end of Sydney Metro Northwest at Chatswood, under Sydney Harbour, through the CBD, and west to Bankstown.

John Holland CPB Ghella (JHCPBG) is building the 15.5 kilometre long twin railway tunnels between Chatswood and Sydenham and excavating six new metro stations.

Construction of the acoustic shed at the northern end of the Barangaroo Station site is planned to be completed in late June 2018. The shed will help minimise noise and dust during excavation of the temporary access shaft which will start in July 2018. The access shaft is needed so that construction equipment including tunnel boring machine (TBM) parts can be lowered underground.

More than 75 per cent of the piles needed around the station area have now been installed. Piling is the process of installing concrete columns into the ground to form a retaining wall before deep excavations can start.

Works are progressing well at Barangaroo

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BARANGAROO STATION

Building the rail crossover cavernRoadheaders will be used to excavate the rail crossover cavern at the Barangaroo Station site. The cavern located under Hickson and Dalgety Roads will be about 230 metres long, 23 metres wide and 19 metres high. Once the cavern is excavated, the walls of the large structure will be supported with rockbolts, sprayed with concrete, waterproofed and lined with concrete.

A specialised TBM will be assembled underground in the crossover cavern before it tunnels under Sydney Harbour to Blues Point. When Sydney Metro services start operating, the cavern will allow trains to change to the other track, so that maintenance work can be carried out with minimal interruption to services. It will also house mechanical ventilation equipment.

JHCPBG will start constructing the crossover cavern in August 2018 with excavation due to be completed in early 2019.

Roadheaders at BarangarooThe first roadheader is due to be delivered in early July and the second one in early August 2018.

What is a roadheader?A roadheader is a tunnelling machine that has a rotating cutter head mounted on a boom. The boom moves both vertically and horizontally, allowing it to create underground structures that are different shapes and sizes. The machine travels on bulldozer-style tracks and is attached to a loading device such as a conveyor. Roadheaders are often used for rail and road tunnel projects.

What type of roadheaders are being used?The project is using 130 tonne class Mitsui SLB300 roadheaders. These machines use steel picks to grind away the rock and are designed for maximum efficiency and economy. Their modular design means they can be delivered in smaller parts and assembled on site.

How are roadheaders operated?The roadheaders are operated from inside cabins on top of the machine. Electronic guidance and cameras are used to ensure the correct shape is cut. The machines are electrically powered.

A similar crossover cavern built at Castle Hill for Sydney Metro Northwest

One of the roadheaders being used to build Martin Place Station

JUNE 2018

Three–month look ahead

Barges will be used to reduce traffic on local roads

Specialist heritage consultants undertaking investigations

A shed for storing excavated material will be built on the Barangaroo foreshore

Activity (subject to change) June July August

Relocating utilities • • •Installing storage shed for excavated material along the foreshore • • •Building a temporary street-level support structure on Hickson Road • • •Piling • • •Excavating the station area • •Excavating the northern access shaft • •

Shed for storing excavated material A storage shed, which will reduce noise and dust, will be built on the Barangaroo foreshore in July 2018. The shed will be about 57 metres long, 15 metres high and 20 metres wide. It will be used to store excavated material from the under-harbour TBM. The excavated material will be stored here before it is removed from the site on barges.

Barging to reduce trafficBarges will be used to move TBMs, machinery and excavated material from the Barangaroo and Blues Point sites. The barges will transport material and machinery away to a temporary barging facility on the Parramatta River near Clyde. Barging will significantly reduce the volume of construction traffic in these areas.

The barges will have high side boards to contain their loads and a canvas canopy that will be used to limit dust during storage (at night, if necessary) and transport.

All the excavated material that is barged will be clean fill and reused at approved residential and commercial development projects across Sydney.

Heritage investigationsSpecialist heritage consultants will undertake comprehensive archaeological investigations in early July 2018 to determine if any items of Aboriginal or historic significance are present.

Previous studies have found the site may contain archaeological evidence of 19th and 20th century structures. This includes the remains of wharves and associated buildings, shoreline modifications such as sea walls, and evidence of trade and industry.

JHCPBG has measures in place to carefully manage any items which are found. The community will be updated on the outcome of these investigations.

City & Southwest

SMCSWTSE-JCG-SBR-SH-NFS-030225

BARANGAROO STATION

Printed on BJ Ball – Ecostar Gloss

Hickson Road support structureA temporary support structure is being built at street level on Hickson Road to allow excavation of the new Barangaroo Station directly underneath.

Traffic is currently diverted to the western side of Hickson Road while the eastern side of the support structure is being built. When completed, traffic will be diverted to the eastern side of the road so that the support structure on the western side can be built. JHCPBG will notify the community before this change occurs.

The eastern side of the temporary support structure on Hickson Road is on target to be completed by the end of July. The bridge structure will allow traffic to continue using the road while the new metro station is excavated below.

The temporary support structure is also designed with acoustic covers to help minimise noise and dust during excavation of the station area.

Treating water on siteA water treatment plant has been set up on the Barangaroo foreshore to treat both groundwater and water used in tunnelling. The water can then be reused onsite or released offsite in line with the project’s Environment Protection Licence.

A water treatment plant will be set up on site at Barangaroo

Minimising dust is a major priority

The temporary support structure on Hickson Road

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Reducing dustTo minimise the creation of dust, JHCPBG has implemented mitigation measures including mitigation measures include, using water during demolition and excavation, regular use of water carts on haul roads and construction areas and compacting stockpiles.

A dedicated spotter has the job of applying water during works to limit dust.

Works are also modified, slowed down or stopped during times of high wind, when dust is more likely to leave the site.

Piles of construction materials are continually sprayed with water and loads are covered before trucks leave the site.

Want to stay up to date?Register today for community email updates at tunnels@transport.nsw.gov.au.

Contact usFor more information, enquiries or complaints please contact us at:

 1800 171 386 24-hour community information line

 tunnels@transport.nsw.gov.au

 sydneymetro.info

 www.facebook.com/SydneyMetro

  Sydney Metro City & Southwest PO Box K659, Haymarket NSW 1240

  If you need an interpreter, call TIS National on 131 450 and ask them to call 1800 171 386