Saturday, 7 September 2013
ROCK CLIMBING
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Rock climbing competitions have the objectives of either completing the route in the quickest possible time or attaining the farthest point on an increasingly difficult route. Scrambing , another activity involving the scaling of hills and similar formations, is similar to rock climbing. However, rock climbing is generally differentiated by its sustained use of hands to support the climber's weight as well as to provide balance.
Rock climbing is a physically and mentally demanding sport, one that
often tests a climber's strength, endurance, agility and balance along
with mental control. It can be a dangerous sport and knowledge of proper
climbing techniques and usage of specialised climbing equipments is crucial for the safe completion of routes. Because of the wide range
and variety of rock formations around the world, rock climbing has been
separated into several different styles and sub-disciplines. While not an Olympic event, rock climbing is recognized by the International Olympic Committee as a sport.
Types of climbing
Most of the climbing done in modern times is considered free climbing —climbing using one's own physical strength, with equipment used solely as protection and not as support—as opposed to aid climbing , the gear-dependent form of climbing that was dominant in the sport's earlier days. Free climbing is typically divided into several styles that differ from one another depending on the choice of equipment used and the configurations of their belay, rope and anchor systems.As routes get higher off the ground, the increased risk of life-threatening injuries necessitates additional safety measures. A variety of specialized climbing techniques and climbing equipments exists to provide that safety. Climbers will usually work in pairs and utilize a system of ropes and anchors designed to catch falls. Ropes and anchors can be configured differently to suit many styles of climbing, and roped climbing is thus divided into further sub-types that vary based on how their belay systems are set up. Generally speaking, beginners will start with top climbing and/or easy bouldering and work their way up to lead climbing and beyond.
Free climbing
The most commonly used method to ascend climbs refers to climbs where the climber's own physical strength and skill are relied on to accomplish the climb. Free climbing may rely on top rope belay systems, or on lead climbing to establish protection and the belay stations.
Anchors, ropes and protection are used to back up the climber and are passive as opposed to active ascending aids. Subtypes of free climbing are trad climbing and sport climbing . Free climbing is generally done as "clean lead" meaning no pitons or pins are used as protection.
Bouldering
Climbing on short, low routes without the use of the safety rope that is typical of most other styles. Protection, if used at all, typically consists of a cushioned douldering pad below the route and a spotter, a person who watches from below and directs the fall of the climber away from hazardous areas. Bouldering may be an arena for intense and relatively safe competition, resulting in exceptionally high difficulty standards.
MOUNTAINEERING EQUIPMENTS
Rock-climbing equipment
Rope, cord and webbing
Climbing ropes are typically of kernmantle construction, consisting of a core (kern) of long twisted fibres and an outer sheath (mantle) of woven coloured fibres. The core provides about 80% of the tensile strength , while the sheath is a durable layer that protects the core and gives the rope desirable handling characteristics.Ropes used for climbing can be divided into two classes: dynamic ropes and low elongation ropes (sometimes called "static" ropes). Dynamic ropes are designed to absorb the energy of a falling climber, and are usually used as Belaying ropes. When a climber falls, the rope stretches, reducing the maximum force experienced by the climber, their belayer, and equipment. Low elongation ropes stretch much less, and are usually used in anchoring systems. They are also used for abseiling or rappeling and as fixed ropes climbed with ascenders.
Modern webbing or "tape" is made of nylon or Spectra/ Dyneema , or a combination of the two. Climbing-specific nylon webbing is generally tubular webbing, that is, it is a tube of nylon pressed flat. It is very strong, generally rated in excess of 9 kN, or about 2,020 pounds of force. Dyneema is even stronger, often rated above 20 kN (about 4,500 lbf or 2000KG) and as high as 27 kN (about 6,070 lbf or 2700 KG).In 2010, UK-based DMM performed fall factor 1 and 2 tests on various Dyneema and Nylon webbings, showing Dyneema slings can fail even under 60 cm falls. Tying knots in Dyneema webbing was proven to have reduced the total amount of supported force by as much as half.
- Extending the distance between protection and a tie-in point.
- An anchor around a tree or rock.
- An anchor extension or equalization .
- Makeshift harnesses.
- Carrying equipment (clipped to a sling worn over the shoulder).
- Protecting a rope that hangs over a sharp edge (tubular webbing).
Carabiners
Carabiners exist in various forms; the shape of the carabiner and the type of gate varies according to the use for which it is intended. There are two major varieties: locking and non-locking carabiners. Locking carabiners offer a method of preventing the gate from opening when in use.
Locking carabiners are used for important connections, such as at the anchor point or a belay device. There are several different types of locking carabiners, including a twist-lock and a thread-lock. Twist-lock carabiners are commonly referred to as "auto-locking carabiners" due to their spring-loaded locking mechanism. Non-locking carabiners are commonly found as a component of quickdraws .
Carabiners are made with many different types of gates including wire-gate, bent-gate, and straight-gate. The different gates have different strengths and uses. Most locking carabiners utilize a straight-gate. Bent-gate and wire-gate carabiners are usually found on the rope-end of quickdraws, as they facilitate easier rope clipping than straight-gate carabiners.
Carabiners are also known by many slang names including biner (pronounced beaner) or Karb.
First climber, who used a carabiner for climbing, was German climber Otto Herzog.
Quickdraws
This is usually of a 60 cm loop and can be tripled over between the carabiners to form a 20 cm loop. Then when more length is needed the sling can be turned back into a 60 cm loop offering more versatility than a pre-sewn loop. Carabiners used for clipping into the protection generally have a straight gate, decreasing the possibility of the carabiner accidentally unclipping from the protection. The carabiner into which the rope is clipped often has a bent gate, so that clipping the rope into this carabiner can be done quickly and easily.
Harnesses
A harness is a system used for connecting the rope to the climber. There are two loops at the front of the harness where the climber ties into the rope at the working end using a figure -eight Knot . Most harnesses used in climbing are preconstructed and are worn around the pelvis and hips, although other types are used occasionally.
Different types of climbing warrant particular features for harnesses. Sport climbers typically use minimalistic harnesses, some with sewn-on gear loops. Alpine climbers often choose lightweight harnesses, perhaps with detachable leg loops.Big Wall climbers generally prefer padded waist belts and leg loops. There are also full body harnesses for children, whose pelvises may be too narrow to support a standard harness safely. These harnesses prevent children from falling even when inverted, and are either manufactured for children or constructed out of webbing.
Some climbers use full body harnesses when there is a chance of inverting, or when carrying a heavy bag. There are also chest harnesses, which are used only in combination with a sit harness; this combination provides the same advantages as a full body harness. However, test results from UIAA show that chest harnesses can put more impact on the neck than sit harnesses, making them slightly more dangerous to use.
Apart from these harnesses, there are also caving and canyoning harnesses, which all serve different purposes. For example, a caving harness is made of tough waterproof and unpadded material, with dual attachment points. Releasing the maillon from these attachment points loosens the harness quickly.
Canyoning harnesses are somewhat like climbing harnesses, often without the padding, but with a seat protector, making it more comfortable to rappel . These usually have a single attachment point of Dyneeme.
Figure eight
Sometimes just called "eight", this device is most commonly used as a descender, but may also be used as a belay device in the absence of more appropriate equipment, by passing a bight through the small hole much like a Sticht Plate . Rigged in the conventional manner, a Figure Eight Descender does not provide enough friction for reliable stopping power in many belay situations.
It is an aluminium (or occasionally steel) "8" shaped device, but comes in several varieties. Its main advantage is efficient heat dissipation. A square eight, used in rescue applications, is better for rappelling than the traditional 8.
Figure eights allow fast but controlled descent on a rope. They are easy to set up and are effective in dissipating the heat caused by friction but have a tendency to put a twist in the rope. Holding the brake hand off to the side twists the rope, whereas holding the brake hand straight down, parallel to the body, allows a controlled descent without twisting the rope. An 8 descender can wear a rope quicker than a tube style belay/rappel device because of the many bends it puts into the rope. Many sport climbers also avoid them because of the extra bulk an 8 puts on the rack. However, many ice climbers prefer to use the 8, because it is much easier to thread with stiff or frozen rope.
MOUNTAINEERING
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Mountaineering is often called Alpinism, especially in European languages, which implies climbing with difficulty such high mountains as the Alps. A mountaineer with such great skill is called an Alpinist. The word alpinism was born in the 19th century to refer to climbing for the purpose of enjoying climbing itself as a sport or recreation, distinct from merely climbing while hunting or as a religious pilgrimage that had been done generally at that time.
The UIAA or Union Internationale Des Associations D'Alpinisme is the world governing body in mountaineering and climbing, addressing issues like access, medical, mountain protection, safety, youth and ice climbing.
Snow
Compacted snow conditions allow mountaineers to progress on foot. Frequently cramprons are required to travel efficiently over snow and ice. Crampons have 8-14 spikes and are attached to a mountaineer's boots. They are used on hard snow (neve) and ice to provide additional traction. Using various techniques from alpine skiing and mountaineering to ascend/descend a mountain is a form of the sport by itself, called ski mountaineering . Ascending and descending a snow slope safely requires the use of an ice axe and many different footwork techniques that have been developed over the past century, mainly in Europe. The progression of footwork from the lowest angle slopes to the steepest terrain is first to splay the feet to a rising traverse, to kicking steps, to front pointing the crampons. The progression of ice axe technique from the lowest angle slopes to the steepest terrain is to use the ice axe first as a walking stick, then a stake, then to use the front pick as a dagger below the shoulders or above, and finally to swinging the pick into the slope over the head. These various techniques may involve questions of differing ice-axe design depending on terrain, and even whether a mountaineer uses one or two ice axes. Anchors for the rope in snow are sometimes unreliable, and include the snow stakes, called pickets, deadman devices called flukes which are fashioned from aluminium, or devised from buried objects that might include an ice axe, skis, rocks or other objects. Bollards which are simply carved out of consolidated snow or ice, also sometimes serve as anchors.
Glaciers
When travelling over glaciers , crevasses pose a grave danger. These giant cracks in the ice are not always visible as snow can be blown and freeze over the top to make a snowbridge. At times snowbridges can be as thin as a few inches. Climbers use a system of ropes to protect themselves from such hazards. Basic gear for glacier travel includes cramprons and ice axes . Teams of two to five climbers tie into a rope equally spaced. If a climber begins to fall the other members of the team perform a self arrest to stop the fall. The other members of the team enact a crevasse rescue to pull the fallen climber from the crevasse.
Ice climing
Multiple methods are used to safely travel over ice. If the terrain is steep but not vertical, then the lead climber can place ice screws in the ice and attach the rope for protection . Each climber on the team must clip past the anchor, and the last climber picks up the anchor itself. Occasionally, slinged icicles or bollards are also used. This allows for safety should the entire team be taken off their feet. This technique is known as Simul-climbing and is sometimes also used on steep snow and easy rock.If the terrain becomes too steep, standard ice climbing techniques are used in which each climber is belayed, moving one at a time.
Shelter
Base Camp
The "Base Camp" of a mountain is an area used for staging an attempt at the summit. Base camps are positioned to be safe from the harsher conditions above. There are base camps on many popular or dangerous mountains. Where the summit cannot be reached from base camp in a single day, a mountain will have additional camps above base camp. For example, the southeast ridge route on Mount Everest has base camp plus (normally) camps I through IV.
Tent
Tents are the most common form of shelter used on the mountain. These may vary from simple tarps to much heavier designs intended to withstand harsh mountain conditions. In exposed positions, windbreaks of snow or rock may be required to shelter the tent. One of the downsides to tenting is that high winds and snow loads can be dangerous and may ultimately lead to the tent's failure and collapse. In addition, the constant flapping of the tent fabric can hinder sleep and raise doubts about the security of the shelter. When choosing a tent, alpinists tend to rely on specialised mountaineering tents that are specifically designed for high winds and moderate to heavy snow loads. Tent stakes can be buried in the snow ("deadman") for extra security.
Snow cave
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