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Wysłany: Czw 2:08, 07 Kwi 2011 Temat postu: gold gucci watches Rebelays and Deviations A Basic |
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Canyoning on Maui - the Best of the Best
Canyon Adventures on Maui
Adventures on Maui
Passing the Deviation
Rebelays
To rig the rebelay, the rappeller locks off and places an anchor aimed against a downward pull. The rope is then re-attached, with some slack, to the new anchor using a figure 8 knot, butterfly, or a rappel block. Obviously, if the rope is short a second rope will be necessary. The rappeller then attaches a short cowstail to the new anchor and hangs on it while he unattaches and re-attaches his rappel device below the new anchor.
A rebelay is simply a second leg of the rappel directly off another anchor. In other words, the rappeller has descended part way and works to one side or another or performs a pendulum maneuver to reach a spot where another anchor station can be established above the second fall line.
Passing the new anchor on rappel is easy. Passing a deviation or rebelay on ascent requires a bit more thought.
These techniques are used at the user's own risk. They should be practiced beforehand where the user will not be injured.
A deviation is another way of bypassing a hazard [link widoczny dla zalogowanych], but instead of the new anchor bearing the full load of the rappeller [link widoczny dla zalogowanych], the rope just runs through a carabiner. To rig a deviation [link widoczny dla zalogowanych], a rappeller should lock off and rig the new anchor against a sideways pull. A runner is then clipped to the anchor and to the rope above the rappel device. The rappeller can then unlock and continue down. Once on the ground or at the next station, the first person down should secure the end of the rope so subsequent rappellers can't accidentally rappel past the deviation, which would pull a loose end up and out of the anchor.
To rappel past a deviation, a the rappeller clips into the deviation with a long cowstail. Without de-rigging the rappel device, the deviaion carabiner is unclipped from the rope below the device and re-placed above it. After unclipping the cowstail the rappelller can continue down.
Passing the Belay
Subsequent rappellers are faced with passing the second anchor. This maneuver is easily accomplished by rappelling to the new anchor, clipping into it on a short cowstail, and hanging on it while the rappel device is transferred below the anchor. An etrier or long runner can be left at the anchor so rappellers can step into it to take the load off the cowstail and re-load their device.
More information on SRT (single rope technique) can be found by typing "single rope technique" into a browser. For information on how SRT applies to Canyoneering, refer to Canyoneering: A Guide to Techniques for Wet and Dry Canyons, David Black, Globe Pequot Press, 2008.
Deviations
Often there are serious hazards that threaten the fall line of a rappel. For cavers and climbers such hazards are typically rockfall and sharp edges. In wet canyoneering the problem may be that the landing zone lies in an area of dangerous hydraulics.
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