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What is soil nailing?

11 Jul 2016



What is soil nailing?

Will - Project Engineer - Furlong Road

Hi, my name is Will and I’m one of the engineers working on the Level Crossing Project out in Furlong.

[Vision: Station sign - Will speaking]

The reason we use soil nails is to retain the soil and to prevent any collapse from happening. In this instance we’ve got the train line running through here.

[Vision: Train line - soil nails]

The soil nails allow us to excavate a new vertical face.

[Vision: Train - excavation]

Doing this means that the trains can keep running and we can build the new track, ensuring safety for those around.

[Vision: Will speaking]

As you can see behind me here, there are a number soil nails.

[Vision: Soil nails - Will speaking]

At about 1.5 metre spacings a driller will come through and drill 125ml diameter hole, about seven or eight metres back into the ground.

[Vision: Steel rod]

We then place these steel rods and fill the holes up with a pliable concrete called grout.

[Will speaking]

Once the grout has had time to harden and be strong, we’ll then apply a load to the end of the nail and try to pull it out of the ground.

[Vision: Steel rod]

This will verify that we have installed the nail correctly and it will do what it’s supposed to do.

[Will speaking]

Once all the nails have been installed, we apply to the base of the wall a sprayable concrete called Shotcrete.

[Vision: Shotcrete wall]

An example of this is behind me here.

[Will speaking]

You will also see that we have to do the works at a number of levels.

[Vision: First level - second level]

To ensure the safety of the train line above, we complete the first level, which is about 1-1.5 metres before continuing down.

[Vision: Excavator - construction site]

Each levels takes around two to three days to complete that involves excavating out, installing the nails, and spraying the Shotcrete.

[Will speaking]

Once that is finished we’ll drop another 1.5 metres, and continue down until we reach the bottom of the excavation.

[Vision: Excavator - construction site]

[Level Crossing Removal Authority - Victoria State Government]

[Speaker: Authorised by the Victorian Government, 1 Treasury Place, Melbourne]

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