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Old 28-09-2014, 05:07 PM   #1
NC_Lane
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Default auger size for retaining wall post

Hi guys,

Does anyone know the correct auger size to get for a post hole digger to use for putting in the Steel H sections for a sleeper retaining wall?

Is it 250mm?

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Old 28-09-2014, 06:32 PM   #2
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Default Re: auger size for retaining wall post

In Qld. the council has to OK plans for retaining walls over certain height and I think the footing dimensions would be on the plans, don't know about Vic.
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Old 28-09-2014, 06:36 PM   #3
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Default Re: auger size for retaining wall post

It also depends on the size of the post.
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Old 29-09-2014, 01:25 PM   #4
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Default Re: auger size for retaining wall post

300 mm or larger if it requires better footing .. Back filled with blue stone and concrete .. I would lean hole & pole 5*+ towards bank ..
Edit I would go 50mm above H section..
I thought it was a 250mm pipe ..
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Old 30-09-2014, 07:49 PM   #5
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Default Re: auger size for retaining wall post

450mm auger for a retaining wall is what to use mate. Order some concrete from your chosen concrete mob, or if you don't need that much, buy some readimix bags (NOT quickset - it's rubbish) which are structural rated, and enjoy mixing them yourself.
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Old 30-09-2014, 09:33 PM   #6
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Default Re: auger size for retaining wall post

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Originally Posted by NC_Lane View Post
Hi guys,

Does anyone know the correct auger size to get for a post hole digger to use for putting in the Steel H sections for a sleeper retaining wall?

Is it 250mm?
The size and depth of retaining wall footings vary depending on the height of the wall.

In Victoria anything over 600mm high requires an engineer, seriously.
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Old 02-10-2014, 09:57 AM   #7
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Default Re: auger size for retaining wall post

Thanks Guys
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Old 09-10-2014, 09:26 AM   #8
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Default Re: auger size for retaining wall post

Hi Guys,

How far do you think I can space the posts? i was told that i can use 1.8m 75mm sleepers with the H posts and it should be fine. Does this sound right?
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Old 09-10-2014, 09:42 AM   #9
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Default Re: auger size for retaining wall post

You need to give us some more information so we're not second guessing.

Height, length, H section, soil...
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Old 09-10-2014, 09:50 AM   #10
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Default Re: auger size for retaining wall post

What sort of sleepers are you using? I assume timber. I used concrete sleepers with H beams to construct retaining walls at my new house, 1.8 was fine for them- but they have reinforced rods running through the sleepers. I think 1.8 spacing is to much for timber as they bow,
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Old 09-10-2014, 11:21 AM   #11
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Default Re: auger size for retaining wall post

height will be 1m length 15m, using H sections soil has a bit of clay on the bottom half
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Old 09-10-2014, 11:32 AM   #12
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Default Re: auger size for retaining wall post

Imo err on the side of caution. Put uprights at the halfway mark as well. Especially if the land behind slopes upwards and actually puts pressure on the sleepers. They will bow eventually, just through continual weather exposure, over engineer it for longevity
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Old 09-10-2014, 11:36 AM   #13
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Default Re: auger size for retaining wall post

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Imo err on the side of caution. Put uprights at the halfway mark as well. Especially if the land behind slopes upwards and actually puts pressure on the sleepers. They will bow eventually, just through continual weather exposure, over engineer it for longevity

Hi Mate,

I dont think I have the option of going uprights at the halfway mark as I am using H beams
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Old 09-10-2014, 12:51 PM   #14
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Default Re: auger size for retaining wall post

Will pm you my mobile number
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