Pulling SWA cables is the rope strong enough...How much can a man pull "Calc's RAMS"

[Stephen Little]

Hi
Need some help with a tech question
How do i know the size of a rope to employ when pulling cable?

Is there a calc for this
The factors to be considered I'm guessing
lenght of pull
Number of men and there pull force
Dead Load
Live Load
Rope in Compression
Tension in rope
Bending forces on rope
Deflection????

any one?

 

[Stephen Little]

Re: Pulling SWA cables is the rope strong enough...How much can a man pull "Calc's RA

lenght of pull
On rollers or across bare ground?
Jacks up then fresh air 15m up on to trays t
Number of men and there pull force
Tug O War team or a couple of blokes from down the pub?
Just bodies
Dead Load
Is the cable run out or on a drum on a stillage?
Drum
Live Load
By live do you mean a downward pull? (I resisted, don’t pull live cables).

haha yes the force pulling down and the movement/swing in the cable as it rises along with the strain on the joint and the force on the pull up

Rope in Compression
Let’s see you compress a rope, I for one will be impressed
by pulling on a rope you force the strands that make up the rope in to compression
the rope is in tension with the forces top and bottom but the fibers are then compressed

Tension in rope
Ropes don’t come with a SWL rating. This has to be found in slinging and rigging books.

No but ropes have a max breaking load

Bending forces on rope
Depends on the size, material and construction.
would have said the issues are loads and force then selection of size material and construction
I want to work out whats best to use do i really need a 20mm nylon rope or can i use a 10mm
should the rope be nylon or is a a more suitable material

Deflection????
?????
Beam load calc's but might have been relevant not sure....?
any one?

 

[alarm man]

Re: Pulling SWA cables is the rope strong enough...How much can a man pull "Calc's RA

Ok
some useful bits and some not so.

I understand if I’m to use a 20mm Nylon which has a UTS 8 ton loading appx

I know the 8ton is more than what I will be pulling up a 15meter riser

Rollers at the top and 3ton jacks in basement

4 men tugging and shoutie bloke in the basement

120 4c Cu Largest cable

Is there a British standard for the physical strength of a man?

We have one for a foot step....

with the ever increasing detail needed in RAMS

is there really not a system to be employed in making sure we have taken all reasonably
praticatible steps to maintain a proven safe system of working

you could use these,the supplier should supply all the data needed for rams

CABLE SOCKS, CABLE PULLING SOCKS, CABLE GRIPS, CABLE STOCKINGS, 3.3KV 11KV 33KV HV CABLE SOCKS

 

[GLENNSPARK]

Re: Pulling SWA cables is the rope strong enough...How much can a man pull "Calc's RA

well anybody`s welcome to see how much i can pull.....i warn you now it will cost you ale and i can get cross n all.....

 

[Knobhead]

Re: Pulling SWA cables is the rope strong enough...How much can a man pull "Calc's RA

One thing I will mention, you may be able to use a 10mm rope. Now you try gripping it while pulling, a bigger rope makes life easier. Also a sisal rope is much easier to grip. Nylon is OK if you’re using a winch.
When we were pulling large cables in we would enrol the lads that worked in the quarry. They were animals but god help you if they hurt their pinkies pulling on the rope.

 

[alarm man]

Re: Pulling SWA cables is the rope strong enough...How much can a man pull "Calc's RA

Ok
some useful bits and some not so.

I understand if I’m to use a 20mm Nylon which has a UTS 8 ton loading appx

I know the 8ton is more than what I will be pulling up a 15meter riser

Rollers at the top and 3ton jacks in basement

4 men tugging and shoutie bloke in the basement

120 4c Cu Largest cable

Is there a British standard for the physical strength of a man?

We have one for a foot step....

with the ever increasing detail needed in RAMS

is there really not a system to be employed in making sure we have taken all reasonably
praticatible steps to maintain a proven safe system of working

to add to that if its a big run id say a set of 2 way radios,shouting pull/stop hold on/whos not pulling etc might not look good on rams and ssow,and depending on the size of the riser a safety harness may be needed for anyone working in or near the top add the cordened off areas etc hard hats saftey glasses gloves etc,not like the old days when you just pulled it in and that was it..

 

[alarm man]

Re: Pulling SWA cables is the rope strong enough...How much can a man pull "Calc's RA

One thing I will mention, you may be able to use a 10mm rope. Now you try gripping it while pulling, a bigger rope makes life easier. Also a sisal rope is much easier to grip. Nylon is OK if you’re using a winch.
When we were pulling large cables in we would enrol the lads that worked in the quarry. They were animals but god help you if they hurt their pinkies pulling on the rope.

and if any of the lads dont have the cable resting on their shoulder when the run stops while having a constipated look on their face,they aint holding the weight,watch out for the lads who seem to be holding it up with one hand,there the ones you shout at..the lazy b***ers

 

[GLENNSPARK]

Re: Pulling SWA cables is the rope strong enough...How much can a man pull "Calc's RA

yeah well nylons ok if your usin animals because they dont count....

 

[Knobhead]

Re: Pulling SWA cables is the rope strong enough...How much can a man pull "Calc's RA

I got accused of bullying one little guy when I dragged him out from between the two biggest guys you could imagine. He was quite happy mincing along grinning like a Cheshire cat.

 

[GLENNSPARK]

Re: Pulling SWA cables is the rope strong enough...How much can a man pull "Calc's RA

**** em.....

 

[Stephen Little]

Re: Pulling SWA cables is the rope strong enough...How much can a man pull "Calc's RA

Thanks Alarm man the rams for the works are pretty much there PPE Exclusion zones routes planned and booked in. I just want to say this is how we are doing it and the reason for selecting the method stated in RAMS
looks like its back to smoke and mirrors

 

[GLENNSPARK]

Re: Pulling SWA cables is the rope strong enough...How much can a man pull "Calc's RA

i`m not in a good mood so i`m off......see you all later......

 

[alarm man]

Re: Pulling SWA cables is the rope strong enough...How much can a man pull "Calc's RA

I got accused of bullying one little guy when I dragged him out from between the two biggest guys you could imagine. He was quite happy mincing along grinning like a Cheshire cat.

i think i done that..once!! its probably the only task i know that brings out real aggression in sparks,lots of shouting and swearing at each other when its a pig of a job..always enjoyed it tho..:ack2:
:ack2:

 

[Deleted member 26818]

Re: Pulling SWA cables is the rope strong enough...How much can a man pull "Calc's RA

I've seen it done with the use of some kind of petrol driven motor.

 

[Engineer54]

Re: Pulling SWA cables is the rope strong enough...How much can a man pull "Calc's RA

There is a lot more to pulling in SWA cable than first seen by the eye!! It's a lot easier than most think, to ''Stretch'' the conductors, which is one of the reasons that cable rollers and pulling socks should ''Always'' be used. Also, where pulling cable through ducts, an engine or electrical driven winch with over tension clutch should again always be used if you don't want to damage the cable...

 

[Stephen Little]

Re: Pulling SWA cables is the rope strong enough...How much can a man pull "Calc's RA

Thank you for the comment. again good advice for consideration. At what size lenght should i be employing rollers
i know its dependant on a number of factors. but is a UTS strenght for cable which would high light this is is it just to go back to the Maker?