Dear All,
Can anyone advise me of a way of requesting / demanding (politely of course)
the temporary suspension of overhead services in order to carry out
essential tree maintenance - i.e. removal of phone wires through trees for
duration of tree work ?
I have in the past asked BT (or whoever) for quotes for suspension of OH
services as it seemed that one business (Local authority) was using the
services of another business (telecom company).
BUT a recent request for a quote came back at £440.00 for temp suspension of
3 wires (ouch) a cost which we could not justify adding to the cost of
pollarding ONE london plane (in the end I cajoled the arb unit into
demonstrating their skill and prowess, training, egos, etc. into doing the
work without breaking the wires).
However I have a number of more difficult subjects to deal with shortly -
trees with over a dozen phone wires going through them.
Any ideas or has anyone had similar experiences ?
Regards
Bo
Bo Walsh
Community Tree Officer
01753 875513
-----Original Message-----
From: Scott Cullen [mailto:dscottcul@xxxx.net]
Sent: 09 October 2003 12:01
To: UK Tree Care
Subject: Re: Rod Bracing
Actually, the mathematical approach can provide useful input. It can be
used as a check against rules of thumb. It can makes us think. To the
extent taht any installation will require engineering approval either some
maths will need to be done or the engineers will so absurdly over engineer
that any five year old could have said the same thing... so why pay an
engineer.
We must recognize that Claus has a bias against aerodynamic estimation of
wind load. He must criticize it because Wessolly embraces it. His fracture
moment approach is not withoutout its shortcomings. But to the extent I've
modeled it it will give a very conservative and "safe" result. What may not
be in the new book (it's downstairs and I'm not going to go check) or any of
the others is that the fracture moment equation gives maximum load. You'd
have to divide the result by safety factor to get a probable environmental
load. But then the horizontal load must be multiplied by lever arm length.
Wessolly and many others do estimate wind load aerodynamically. Claus's
critiques are in part valid reasons for caution but, at least as expressed
in Body Language of Trees, are in part in error.
Claus does note how to estimate necessary bracing material strength. It
might be in the Pauli book. Or maybe Stupsi.
----- Original Message -----
From: "Tony Ash" <Tony.Ash@xxxxxxx.gov.uk>
To: "UK Tree Care" <uktc@xxxxxx.tree-care.info>
Sent: Thursday, October 09, 2003 3:34 AM
Subject: RE: Rod Bracing
<<Work out potential loads? In short no, but if you get hold of the new
Mattheck and Weber book from the Arb assoc, there's a load of formulae in
there which
might help you work something out. I can't make head or tail of em.
Helpfully Claus writes at one point: "...We believe it is impossible to
determine precise wind loads." >>
Thanks for writing that, Bill, Its made a good start to my day. I do
think
the formula laid mathematical approach is depressing, trying to predict
outcomes for scenarios that are often as unpredictable as they are
surprising. You can't beat a good old bit of common from an experienced
arborist.
-----Original Message-----
From: Andersonarb@xxxx.com [mailto:Andersonarb@xxxx.com]
Sent: 08 October 2003 21:00
To: UK Tree Care
Subject: Re: Rod Bracing
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