UKTC Archive

RE: Moling and air spading

Subject: RE: Moling and air spading
From: "will Ross"
Date: Dec 06 2017 09:40:48
Philip,
          Funnily enough I am working on a  woodland site on heavy clay where 
drains are going down as far as 3m, the guys I am working with are 
experienced pipe layers although we have had our problems. They have been 
working in trench box's so there can be a problem  with roots in this case 
most of the area had been previously excavated without supervision by another 
contractor resulting in root carnage. The only other option we had but have 
not resorted to yet is pipe jacking which as Jim said will require launch 
pits. My advice if it's worth anything is choose your machine operator and 
your fitters and ensure they are inducted by yourself and as there advice 
especially the blokes on the tools they seem to know the most from my 
experience. If you want any more info let me know

Will

-----Original Message-----
From: uktc-request@xxxxxx.tree-care.info 
[mailto:uktc-request@xxxxxx.tree-care.info] On Behalf Of Philip Wilson
Sent: 06 December 2017 08:54
To: UK Tree Care
Subject: RE: Moling and air spading

That's very helpful, Tim and Jim. I wonder how much access to the trench 
would be required to facilitate the working of the machine in London clay. I 
can see that shoring as it were from the side (below the roots) could be 
problematical. I'll continue my enquiries with the contractors...
Thanks again, Philip

-----Original Message-----
From: uktc-request@xxxxxx.tree-care.info 
[mailto:uktc-request@xxxxxx.tree-care.info] On Behalf Of Tim Moya
Sent: 05 December 2017 14:59
To: UK Tree Care
Subject: RE: Moling and air spading

Depending on soil type, air spade with vacuum extraction can be a very 
efficient means of excavation. It works very well in dry sandy soils. I 
recently attended an excavation to 2.5m depth  with extents of about 2m x 2m 
- the excavation took about 2 hours. One advantage is that the vacuum tube 
can be extended to extract soil without the need to enter the pit. It sucks 
up half bricks with no problem.

In this case there was an interesting use of clingfilm to attach the flexible 
extension. On really light dry soils I have seen it used without the need for 
an air spade.

However, as Jim says, any work within the pit will need shoring in order for 
people to work within the excavation.

Tim Moya




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The UKTC is supported by Bosky Trees arboricultural consultancy
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