Old Lineman Never Die......We Just Don't Raise Our Booms As Often
We had a situation where the proper easement wasn't available and we had to deadend twin circuits with secondariry and CATV with Tel.
Dug a trench laid in a dead man timber, poured about 3 cubic yards of concrete on top, back filled and nothing ever moved.
More cost but better appearance and reliability for the ages.
I think that is money well spent.
The Old Lineman
We call them a slug, seen places where a double helix would not hold because of soil conditions, but the slug did not budge.
As far as using formulas in the field cant say as we do either, but it helps for new guys to see what kind of weight they are dealing with, whether guying, lifting conductor, dead ending or bi-sect tension. Also they can see by putting the anchor farther away there is less tension on the guy & anchor.
Call it what you want but basically we used railroad ties (will never rot).
One thing that wasn't mentioned was that you should never ever use web hoists for this work. Seen it done.
Wrong environment and will become contaminated. It is a live line tool first and last. Never designed for these tensions.
The Old Lineman
We use old pole butts that are treated.
I agree you should never use web hoists on the ground, but as far as tension the largest chain hoist we have is ton & a half, we also have 2 ton Lugall web hoists that we have to use for tensioning our neutral on spun buss because the chain will not get it tight enough.
Last edited by lewy; 11-27-2010 at 11:17 AM.
We called em Dead Man anchors or Log anchors........before the company quit buying them, when we did use a log anchor, we used an old pole butt, and wrapped them with 'Kotex'...a treatment wrap that was used to butt treat old poles that we re-set.............sometimes we used helix anchors when we could........
We did a 795 job and used 12K anchors and 7/16 guy, one per phase, on one vertical 90 degree angle pole...engineers checked the tension, and said the anchors were holding 20K pounds, so we came back and added 8k pound anchors and 5/16 guy, again 1 per phase.......engineers were happy...only trouble, the DE bells were only rated at 5k pounds!!!!!
so much for engineers........
Old Lineman Never Die......We Just Don't Raise Our Booms As Often
You did guy both ways not just bisect the corner?
Was it also 1 anchor per phase or 1 guy per phase going to the same anchor?
Your anchor tension is usually almost double your line tension, depending how far the anchor is away.
How long were the spans, I am asking because that is really high compared to what I work with, the largest wire we use is 556 & spans around 150' so we would be no where near that kind of tension.
We normally use 3/8 guy steel good for 13000lbs unless it is guying something crossing a railway, waterway or major highway then we us 7/16 good for 19000 lbs
First off: sorry for pinging such an old thread but ive tried searching for this proper formula for a while now and finally figured it out. The formula you posted isnt necessarily wrong, however it is missing important parenthesis ( ) that make this equation make sense.
Here is the proper formula for anyone that may come across this again.
T=tension of conductors
H=height of guy attachment
L=Length of guy lead
Guy Tension= T( sqrt ( L^2+H^2) / L )
With the given numbers you should have 1000 x ( sqrt (30^2+50^2) / 30)
according to PEMDAS:
1st solve parenthesis
2nd exponents
3rd multiplication
4th division
5th addition
6th subtraction
so first you must solve the inner most parenthesis which is ( L^2+H^2)
To solve we follow PEMDAS again and solve the exponents first which gives us ( 900+2500 )
Then solve the addition which gives us (3400)
Now our formula is simplified slightly to 1000 ( sqrt (3400) / 30)
Next step is to solve the sqrt before anything else. this gives us 1000 ( 58.3095189/ 30)
Then we solve the inner parenthesis division of 58.3095189/30 which = 1.94365063
then we can finish the solving of our simplified formula which is now 1000(1.94365063)
1000 x 1394365063 = 1943.65063 round to the nearest whole number which gives us 1944lbs.
Hopefully this is written up in a way that anyone can understand. I hope it helps someone because without the proper placement of the parenthesis this formula will simply give you the wrong answer every time.