Oxlow Pull Through - Basic Question

[jasonbirder]

Just a pretty straight forward question -
Was looking at the Pull through into the Oxlow New Series last night when we were in there and fancy having a trip up there on my next visit into the mine.
Just a look into the extensions mind...not the through trip to Giants...I certainly don't eat three shredded wheat for breakfast....
It looks pretty straight forward to rig - but as i've never done it and never watched anyone else do it I thought i'd double check...
Is it a case of simply tying your rope into the cord, pulling it up through the bolts at the top, pulling it back down the other side and rigging a Y-hang on the two bolts in the wall at the bottom?
Or is there something clever i'm missing?
Thanks alot in advance!!!

 

[caverholic]

Yep its as simple as that!
Cavers aren't the brightest sparks!

When you get to the top head left to go toward giants oxlow, but rights quite interesting aswell.

 

[tubby two]

Yep, a wee bit of gaffer tape might aid the passage of the rope through the top ring too.

tt.

 

[Cave_Troll]

There might be less wear on the top anchors if you rigged as a pull through and pulled back up again.

 

[SamT]

There might be less wear on the top anchors if you rigged as a pull through and pulled back up again.

:-\ - not sure what you mean

 

[tubby two]

Get a rope three times the length of the pitch and pull one end up through the ring, then tie a knot in the long end of the rope and put a crab on it, through which you pass the short end and keep pulling, so the crab and knot slide up the rope youre pulling down. The krab then jams on the rings allowing you to prussik up and ab down the rope you were just pulling on, and then pull the other rope with the crab on when youve done so it all comes back to the ground. Hence its anchored at the top and doesnt wear the top rings. This might well be the most complex description of a simple idea ever written. Oh well.

tt.

 

[SamT]

OK - I know what you mean. Dont really see how this wears the ring at the top any more or less than than tying it off at the bottom.
Plus youve got to lug a load tones more rope than you actually need.

Have DCA got round to sorting out the ring at the top with one of their fancy new stainless efforts yet 

 

[Brains]

Caving rope is only semi static, so as you climb up there will be bounce, of which about half will be sawing away at the top anchor. We have all seen the grooves worn by gritty lifelines at pitch heads, and they are generally not carrying a load.... Minimising the wear on the top anchor can only be a good thing

 

[Cave_Troll]

good heavens! at least two people have succesfully read my mind

 

[Brains]

...but then I thought it was the obvious way to do it, and it also eliminates some of the chance of the last man abseiling on the wrong side...

 

[Cave_Troll]

well not really. when rigged with a Y hang at the bottom then up to the top anchors and then back down again, you can still clip onto the wrong side. in fact it might be easier as you've not got the knot at the top to remind you (not the Knot)

 

[SamT]

Unless of course your sensible and clip the "wrong side" into a least one of the bolts at the bottom as I always do.  :ras:

 

[Brains]

The way I have normally done this is with a rope just a few m longer than the pitch. Send one end up on the cord, and before the other end goes up, put a knot and krab in the end, and clip it round the cord. Keep pulling and the first end will loop over the top and come back down, passing thru the krab on the knot. Pull until tight on the top belay, then first man climbs up and rigs it properly and gets the cord out the way at the top / to one side, everyone else up , then down, and last man down fixes cord to krab in the top end of the rope which is re-rigged as per first climb. Once safely down, recover your rope and away. Sounds a faff, but everyone bar first / last has a properly rigged pitch, and there is no chance of abseiling off the wrong side, or wearing the belays excessively. I hope I have explained that in an understandable manner?
Still, any way that doesn't leave you stranded or broken has got to have some merit...

 

[SamT]

I like it

 

[tubby two]

Very french, the old jammed knot in the bolt style pull-through. Never tried it myself.

tt.