Author Topic: Sometimes The Roof Is Safer On The Floor.  (Read 978 times)

Offline The Old Ruminator

  • forum hero
  • *****
  • Posts: 3520
Sometimes The Roof Is Safer On The Floor.
« on: July 21, 2020, 07:14:12 pm »
Usual Tuesday larking about.

P7210055 - Copy by Nicholas Chipchase, on Flickr

P7210052 - Copy by Nicholas Chipchase, on Flickr

Offline pwhole

  • forum hero
  • *****
  • Posts: 1989
  • TSG, DCA, PDMHS
    • Phil Wolstenholme website
Re: Sometimes The Roof Is Safer On The Floor.
« Reply #1 on: July 21, 2020, 07:24:06 pm »
Impressive. Was that all a flat-out crawl to begin with? ;)

Offline The Old Ruminator

  • forum hero
  • *****
  • Posts: 3520
Re: Sometimes The Roof Is Safer On The Floor.
« Reply #2 on: July 22, 2020, 08:56:23 am »
Next time a photo of the roof actually on the floor. As ever more caving photos on the forum, please.

Offline Duck ditch

  • menacing presence
  • **
  • Posts: 229
Re: Sometimes The Roof Is Safer On The Floor.
« Reply #3 on: July 22, 2020, 05:35:21 pm »
It reminds me of a time when we were banging the roof off a sump.  I still cant get my head round Whether  we were just displacing the water upwards or not.   :doubt:

Offline Fjell

  • addict
  • **
  • Posts: 146
Re: Sometimes The Roof Is Safer On The Floor.
« Reply #4 on: July 23, 2020, 07:56:38 am »
It looks like one the of the Bath stone mines on a very bad hair day.

Are you capping that keystone? You know, like with a hammer? Or are you on the end of a wire?

Offline The Old Ruminator

  • forum hero
  • *****
  • Posts: 3520
Re: Sometimes The Roof Is Safer On The Floor.
« Reply #5 on: July 23, 2020, 08:41:58 am »
A very long wire.

Offline Speleotron

  • forum star
  • ****
  • Posts: 577
  • YUCPC, ULSA
Re: Sometimes The Roof Is Safer On The Floor.
« Reply #6 on: July 23, 2020, 01:30:25 pm »
If the width of the sump was the same as the width of the roof then you were just raising the water level by an equal amount, probably making the sump harder as well as the rubble from the roof wouldn't pack 100% efficiently, so the floor of the sump would rise more than the ceiling of the passage, and hence the airspace would shrink. Of course, you can remove the rubble from the sump which was probably the point of the operation.
In search of taverns measureless to man

Offline mikem

  • forum hero
  • *****
  • Posts: 3635
  • Mendip Caving Group
Re: Sometimes The Roof Is Safer On The Floor.
« Reply #7 on: July 23, 2020, 01:39:48 pm »
Unless the sump level was sat at or near the spill point, in which case the water would be displaced over the edge.

 

Main Menu

Forum Home Help Search