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Albert St trench V2 14 January 2018.JPG

Albert St Tunnel Box Starts

ALBERT ST TUNNEL BOX STARTS

 

In Albert Street, construction of the first tunnel box is starting.

It took three days to install the first 12 metres of the waterproofing.

  BOXED IN: The team working on the blinding layers and preparing the start of the tunnel box.

BOXED IN: The team working on the blinding layers and preparing the start of the tunnel box.

The first step of the works was to place a first layer on the wall and floor.

This material is called filter cloth. It will protect the waterproofing membrane from perforation by the concrete.

Once installed, the waterproofing membrane is placed on top.

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  INSTALLED: The waterproofing membrane has been installed. In the backdrop, the new stairwell access/egress in and out of the southern end of the tunnel

INSTALLED: The waterproofing membrane has been installed. In the backdrop, the new stairwell access/egress in and out of the southern end of the tunnel

  WOW! Construction staff look at what has been done so far. In the far end is the work still to be done as the excavator continues to plough in through the trench

WOW! Construction staff look at what has been done so far. In the far end is the work still to be done as the excavator continues to plough in through the trench


Meanwhile, bulk excavation of the cut-and-cover trench on Albert Street is continuing towards the Customs Street intersection.

Albert St trench Jan 2018 10.JPG

The construction process included installing steel mesh and pin into the wall of the trench for temporary rock support.

  PREPARATION: Alan Phillips (Connectus Tunnel Manager) spraying the wall. Viliame Delavakavu (Connectus Operator) is driving

PREPARATION: Alan Phillips (Connectus Tunnel Manager) spraying the wall. Viliame Delavakavu (Connectus Operator) is driving


This is followed by ‘shotcreting’: this means spray-concreting a smooth surface for the waterproofing membrane of the tunnel box. The shotcreting team is currently completing the first 44 metres section of wall.

The last preparation step is the ‘blinding layer’: pouring concrete on the floor of the trench to form a flat, smooth layer for the concrete slab that holds the tunnel rails. The first 44 metres of blinding is already complete.

The team then started the construction of 29 sections of tunnel box, each 12 metres long.

The waterproofing membrane wasinstalled on the floor and walls, steel reinforcement is fixed for the base slab, and formwork installed before finally pouring tunnel concrete.

Once about 60 metres of the tunnel box is constructed, the team can start backfilling.

These steps will be followed, stage after stage, for approximately 350 metres of tunnel.


It will be a very busy and challenging duration working in an 18 metre deep excavation in the middle of a live CBD street.
— Thomas Jefferd, Connectus Tunnel Box Project Engineer,

In the second half of the year, the Albert Street trench excavation will be completed and connected to the Precinct Properties site on the corner of Customs and Lower Albert Streets.

The tunnel box construction will continue all year, following behind the excavation.

By mid-year, the Albert Street trench will start to be backfilled between Wyndham and Swanson Streets and the first portion of road reinstatement is expected to start at that location before the end of the year.

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View drone footage from above Albert Street

Here are some recent photos of the trench work

Albert St trench V2 14 January 2018.JPG
Albert St trench V3 24 January 2018.JPG
Albert trench 24 Jan 2018.JPG
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Albert St trench Jan 2018 7.JPG
Albert St trench Jan 2018 11.JPG
Albert St trench 9.JPG

This is how the Precinct Fletchers Commercial Bay tunnel development is looking

Precinct Feb 7 2018.jpg

You can view the Albert St trench work at our pedestrian bridges on Albert St. They're at Swanson St and outside the Shakespeare Hotel.

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