ROADS and Maritime Services 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

Grafton Bridge constuction timeline photos.
Grafton Bridge constuction timeline photos. Roads and Maritime

Step 1

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

Grafton Bridge constuction timeline photos.
Grafton Bridge constuction timeline photos. Roads and Maritime

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.

 

 

Grafton Bridge constuction timeline photos.
Grafton Bridge constuction timeline photos. Roads and Maritime

Step 3

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

Grafton Bridge constuction timeline photos.
Grafton Bridge constuction timeline photos. Roads and Maritime

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.

 

Grafton Bridge constuction timeline photos.
Grafton Bridge constuction timeline photos. Roads and Maritime

Step 5

The shape of the piers has been chosen as similar to the existing crossing, so as not to detract from the heritage and status of the steel truss bridge.

This will then be filled with concrete, the shutters removed, and final connection to the bridge box girder sections prepared.

 

Step 6

Grafton Bridge constuction timeline photos.
Grafton Bridge constuction timeline photos. Roads and Maritime

This will be performed by a large tracked crawler crane, located on the river barge.

Workers near the top of the pier will help to guide the segment safely into position.

With the first girder secured, thick steel cables are threaded through, ready for the next piece.

 

Grafton Bridge constuction timeline photos.
Grafton Bridge constuction timeline photos. Roads and Maritime

Step 7

Essentially, this means that the bridge will have the precast girder sections from the barge, installed on alternating sides of the pier to balance the load over the pier.

The girder sections will be tied together using the thick steel cables, and stressing the cables between adjoining sections.

Step 8

Grafton Bridge constuction timeline photos.
Grafton Bridge constuction timeline photos. Roads and Maritime

Super-T girders have been chosen on the outer spans to maximise clearance to Greaves Street on the northern side and to provide flood capacity on the southern side.

 

 

 

 

Grafton Bridge constuction timeline photos.
Grafton Bridge constuction timeline photos. Roads and Maritime

Step 9

Seven Super-T girders will be placed side-by-side to form the span and a deck poured on top to match the top surface over the bridge.

 

 

 

 

Step 10

Grafton Bridge constuction timeline photos.
Grafton Bridge constuction timeline photos. Roads and Maritime

Finally, the bridge will be completed with an asphalt surface, new road barriers, lighting, signage and line marking.

 

 

 

 

 



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