UKTC Archive

RE: Gabion wall within RPA

Subject: RE: Gabion wall within RPA
From: admin
Date: Jul 27 2020 08:08:00
Morning,

Really interesting thread with many informative contributions all of which 
are entirely valid and well thought out.

Might I suggest that the starting point is the tree and not the structure.  
What species, age and condition?  Is it tolerant of root damage due to 
species type e.g. Monterey Cypress or is it intolerant of damage e.g. mature 
Beech.  Can you offset the RPA successfully.

This is also a third-party tree so you need to be mindful of avoiding any 
harm which may lead to a decline in overall health / condition.

BS5837 has the default position of no structures being in the RPA without a 
justification.  Is there an engineering requirement to install gabions in the 
RPA for a scheme which has planning permission or is this just a design 
proposal for landscaping etc.  A Tree Officer might object to this without a 
reasonable justification.

Just throwing this in there to see if any more information is available.

Regards

Oliver Bennett  Prof Dip (RFS) M.Arbor.A
Arboricultural Consultant
Objective Tree Consultancy

Ph 01326 XXXXXX

Email: admin@xxxxxxxxxxxxxxxxxxxxxxxxx.co.uk
Website: www.objectivetreeconsultancy.co.uk


                     




-----Original Message-----
From: uktc-request@xxxxxx.tree-care.info <uktc-request@xxxxxx.tree-care.info> 
On Behalf Of Wayne Tyson
Sent: 24 July 2020 06:07
To: UK Tree Care <uktc@xxxxxx.tree-care.info>
Subject: Re: Gabion wall within RPA

Redundantly, perhaps, *context is everything. *Once one knows the objective. 
Gabion manufacturers might be a good source of information.

Wayne

PS: I have used angular stones laid up dry (no mortar, they must maintain
porosity) with a significant batter where some people would insist on gabion.

On Thu, Jul 23, 2020 at 8:23 AM Ben Rose <benrose@xxxx.co.uk> wrote:

Dear all,

I had an interesting conversation about this with an engineer. You can 
convert loading per square metre into kPa quite easily (there are lots 
of converters online if you want to try).

If the gabion is 1.7 metric tonnes (1700kgs) per m3 that converts to 
16.7kPa per metre height of gabion. That ground pressure is between 
the pressure exerted by a quad bike (14kPa) and a standing human 
(55kPa). So, when considering static loading, I don't think that 
building stone-filled gabions would cause serious ground compaction.

Ben


Sent: Thursday, July 23, 2020 at 12:29 PM
From: "Jon Kiely" <jk-tc@xxxxxxxx.com>
To: "UK Tree Care" <uktc@xxxxxx.tree-care.info>
Subject: Re: Gabion wall within RPA

Lady-boy mud wrestling aside, isn’t the load spreading idea with
cellular confinement systems based on passing point loads e.g. 
stilettos, rather than static loads already spread in a wire basket?
The CCS solution isn’t a one-stop-shop. The details are key, as
suggested by others:
soil type
ground conditions
water table
root distribution
foundations
size of gabion

The baskets are generally about 0.5m wide and 1-2m long.
In any case the fill is typically about 1400-1700kgs per m3 
depending on
material used.


Jon K



--
The UK Tree Care mailing list
To unsubscribe send mailto:uktc-unsubscribe@xxxxxx.tree-care.info

The UKTC forum is supported by Bosky Trees arboricultural 
consultancy and Stockholm Tree Pits 
https://www.stockholmtreepits.co.uk





--
The UK Tree Care mailing list
To unsubscribe send mailto:uktc-unsubscribe@xxxxxx.tree-care.info

The UKTC forum is supported by Bosky Trees arboricultural consultancy 
and Stockholm Tree Pits https://www.stockholmtreepits.co.uk




-- 
The UK Tree Care mailing list
To unsubscribe send mailto:uktc-unsubscribe@xxxxxx.tree-care.info

The UKTC forum is supported by Bosky Trees arboricultural consultancy and
Stockholm Tree Pits
https://www.stockholmtreepits.co.uk




-- 
The UK Tree Care mailing list
To unsubscribe send mailto:uktc-unsubscribe@xxxxxx.tree-care.info

The UKTC forum is supported by Bosky Trees arboricultural consultancy and
Stockholm Tree Pits
https://www.stockholmtreepits.co.uk