Newspaper article Daily Examiner (Grafton, Australia)

Ten Steps towards Building a New Bridge for Grafton

Newspaper article Daily Examiner (Grafton, Australia)

Ten Steps towards Building a New Bridge for Grafton

Article excerpt

THE RMS have released a breakdown of the construction process for building the second-river crossing at Grafton - broken down into ten steps.

For more information on the project, visit: www.rms.nsw.gov.au/ graftonbridge

Step 1

The first step in building the new bridge is land-based piling. These piles will form the foundation on which the new bridge abutments and approaches to the river crossing will be built.

Piling is done by drilling deep into the ground (to solid rock), this hole is then filled with reinforced concrete to give a strong foundation for the new structure.

A temporary jetty will also be built to allow for precast bridge girder sections to be loaded onto a barge for transportation to the river.

Step 2

The piling will be done using a bored piling rig, with a circular bore connected to a large hydraulic drilling rig.

The size of the bored piles will range from 1.2 metres for land-based piles, up to three metres for river based piles.

Five foundations will be built in the river, and five on land.

Step 3

The river-based piles will be drilled into rock at the base of the river bed from a piling rig on a barge.

Permanent steel casings will be placed from the pile at the base of the river, to above the water line to allow for concrete columns to be formed in the river.

Steel reinforcing bars can be seen protruding from the piles.

These will help to form the connection between the river piles and the piers that hold the bridge above the water.

Step 4

Once the river-based piles are complete, we will start building the piers.

The piers provide a structural connection between the foundation in the river and the bridge above.

This will start with tying reinforcing steel for inside the concrete pier.

Step 5

Following the tying of the reinforcing steel, temporary steel shutters are placed around to form the shape for the pier concrete. …

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