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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions.

Base for lamp-post



 
 
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  #1  
Old November 10th 08, 04:56 PM posted to uk.d-i-y
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Posts: 22
Default Base for lamp-post

I have just bought a lamp-post for my front garden to replace a small
pedestal that had been knocked over too many times.
I am planning to make a base for it to stand on using threaded rod and
angles buried in concrete.

1. how deep does it need to be?

2. Should I use stainless steel, or will mild be good enough for this
purpose?

3. How do I work out how much concrete to mix? considering that bags of
cement and ballast are sold by weight and holes in the ground are
measured by volume?

thanks

dan
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  #2  
Old November 10th 08, 05:04 PM posted to uk.d-i-y
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Posts: 3,357
Default Base for lamp-post

On Mon, 10 Nov 2008 16:56:20 +0000 someone who may be Dan Smithers
wrote this:-

I have just bought a lamp-post for my front garden to replace a small
pedestal that had been knocked over too many times.
I am planning to make a base for it to stand on using threaded rod and
angles buried in concrete.

1. how deep does it need to be?

2. Should I use stainless steel, or will mild be good enough for this
purpose?

3. How do I work out how much concrete to mix? considering that bags of
cement and ballast are sold by weight and holes in the ground are
measured by volume?


Not enough information.

How tall is this lamp post? What is it made of? What is attached to
what will be the top?





--
David Hansen, Edinburgh
I will *always* explain revoked encryption keys, unless RIP prevents me
http://www.opsi.gov.uk/acts/acts2000/00023--e.htm#54
  #3  
Old November 10th 08, 05:25 PM posted to uk.d-i-y
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Posts: 377
Default Base for lamp-post

On Mon, 10 Nov 2008 16:56:20 +0000, Dan Smithers wrote:

I have just bought a lamp-post for my front garden to replace a small
pedestal that had been knocked over too many times.
I am planning to make a base for it to stand on using threaded rod and
angles buried in concrete.

1. how deep does it need to be?

2. Should I use stainless steel, or will mild be good enough for this
purpose?

3. How do I work out how much concrete to mix? considering that bags of
cement and ballast are sold by weight and holes in the ground are
measured by volume?

thanks

dan


A lamp-post for a front garden ?
I'm trying to imagine that in-situ
  #4  
Old November 10th 08, 07:01 PM posted to uk.d-i-y
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Posts: 9,459
Default Base for lamp-post

On Mon, 10 Nov 2008 17:04:23 +0000, David Hansen wrote:

3. How do I work out how much concrete to mix? considering that bags of
cement and ballast are sold by weight and holes in the ground are
measured by volume?


Close enough is 1 cubic metre = 1 tonne.

How tall is this lamp post? What is it made of? What is attached to
what will be the top?


And how exposed to the wind is the location? What would be suitable for a
sheltered suburban garden wouldn't be any good up here...

--
Cheers
Dave.



  #5  
Old November 10th 08, 07:22 PM posted to uk.d-i-y
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Posts: 1,118
Default Base for lamp-post

"Dave Liquorice" wrote:

On Mon, 10 Nov 2008 17:04:23 +0000, David Hansen wrote:

3. How do I work out how much concrete to mix? considering that bags of
cement and ballast are sold by weight and holes in the ground are
measured by volume?


Close enough is 1 cubic metre = 1 tonne.



Don't be ridiculous.

A cubic metre of well compacted concrete weighs 2.4 tonnes. With poor
compaction such as you get when pouring concrete into a hole, you
should still expect to get around 2.0 tonnes to the cubic metre.

Also, take more care with your attribution, because the words you
quoted were not Mr Hansen's. So stand by for some of the usual mock
outrage from Mr. H. ;-)

  #7  
Old November 11th 08, 08:52 AM posted to uk.d-i-y
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Posts: 22
Default Base for lamp-post

David Hansen wrote:
On Mon, 10 Nov 2008 16:56:20 +0000 someone who may be Dan Smithers
wrote this:-

I have just bought a lamp-post for my front garden to replace a small
pedestal that had been knocked over too many times.
I am planning to make a base for it to stand on using threaded rod and
angles buried in concrete.

1. how deep does it need to be?

2. Should I use stainless steel, or will mild be good enough for this
purpose?

3. How do I work out how much concrete to mix? considering that bags of
cement and ballast are sold by weight and holes in the ground are
measured by volume?


Not enough information.

How tall is this lamp post?


approx 2m

What is it made of?

It's a modern cast Aluminium shaft. I think that the weight is less
important than the leverage offered when the kids try to swing on it.

What is attached to
what will be the top?


Would a light be a facetious answer?

A copper framed glazed lantern case that looks like an old gas light.

thanks

dan
  #8  
Old November 11th 08, 09:59 AM posted to uk.d-i-y
external usenet poster
 
Posts: 9,115
Default Base for lamp-post

In article ,
David Hansen writes:
On Mon, 10 Nov 2008 16:56:20 +0000 someone who may be Dan Smithers
wrote this:-

I have just bought a lamp-post for my front garden to replace a small
pedestal that had been knocked over too many times.
I am planning to make a base for it to stand on using threaded rod and
angles buried in concrete.

1. how deep does it need to be?

2. Should I use stainless steel, or will mild be good enough for this
purpose?

3. How do I work out how much concrete to mix? considering that bags of
cement and ballast are sold by weight and holes in the ground are
measured by volume?


Not enough information.

How tall is this lamp post? What is it made of? What is attached to
what will be the top?


For streetlamps, typically they extend into the ground by around
15% of their height above ground, but they are sometimes set into
a vertical pipe which does effectively extend the depth. For a
relatively short column which you probably have, this figure
probably needs to be more than 15%, as much of that will just be
in the topsoil which won't provide much of a foundation.

Many years ago, I saw the contractor's spec for lining a long drive
with gaslamp style electric lighting. These were done by setting
a length of fat pipe vertically, well below ground level in concrete.
Pipe hole left empty. When this was set, the lamp column is stood
in it, packed in with mortar with almost no cement in it (I think
this it to allow it to be pulled out if it has to be replaced).
The bit which I particularly liked was that the columns had to be
set randomly a few degrees off-vertical, but never towards the road.
In the picture of the final result, it looked like a road with
gaslamp columns which had been there for over 100 years. The
setting of them randomly slightly off-vertical was a very clever
design effect.

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]
  #9  
Old November 11th 08, 02:10 PM posted to uk.d-i-y
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Posts: 118
Default Base for lamp-post

On 10 Nov, 17:25, wrote:

A lamp-post for a front garden ?
I'm trying to imagine that in-situ


Here you go: http://www.tlc-direct.co.uk/Images/P...3/BGRAL180.JPG
Could look a bit daft in a suburban street but in a place with the
right character shouldn't look out of place.

 




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