Subchapter: Anchors
Anchors
Anchors and pitons on the rock face
Unlike in sport climbing regions, on alpine routes there are normally no solid bolts at regular intervals. Particularly on easier alpine climbs, the distances between bolts are great, there are no bolts at all, or are of questionable quality. Additionally, in certain routes there may be a conscious decision made not to use bolts in order to maintain the classic, alpine character of the climb. In such routes the climber must protect themselves independently – or additional anchors must be placed to complement questionable pitons. This applies to protection points just as much as to proper anchors. The attaching and evaluation of available anchors are therefore extremely important in alpine climbs.
A good alpine climber is able to quickly recognize possible anchors and has mastered the use of traditional climbing equipment.
FORM-LOCKING SYSTEMS
“Form-locking systems” are commonly referred to as “glue-in bolts”. When positioned correctly, they provide maximum rigidity. However, they are also extremely prone to positioning errors.
APPLICATION
Once the drill hole is cleaned out (drill dust cleared), a suitable adhesive (cement) with heavy load approval is used. It is absolutely essential for the climber to observe the expiry date and the application instructions of the cement. Overall, application is complex and should only be undertaken after instruction and suitable experience.
SOFT STEEL PITONS
Soft steel pitons should adjust to the direction of the crack. When inserting them, a third of the total length must be in the crack and it should “sing” when hit, i.e. the piton should create an increasingly high-pitched sound with each hammer blow.
HIGH CARBON STEEL PITONS
High carbon steel pitons become jammed when hammered into a largely parallel granite crack. It should therefore be possible to insert them up to two thirds of their total length and push them as far as the stop. These too should “sing” in the process.
THE TREE AS AN ANCHOR
Trees, roots, branches and pines can be used as anchors. Here a sling is wrapped around a tree in a girth hitch so that it cannot move upwards. Sewn slings made of Dyneema, polyamide and fabric blends or cords made of Dyneema, Kevlar or polyamide are suitable for this. A tree used as an anchor should be green, meaning it has not died and is not rotten. The diameter of this natural anchor should be at least as thick as a leg.
NOTE: Setting up a direct anchor around a tree is a no-go, as this will damage the bark. Instead, a sling is laid around a tree in a girth hitch and redirected through a carabiner.
THE TUNNEL AS AN ANCHOR
To be able to use a tunnel as an anchor, it should be at least as thick as an arm at the weakest point and should not have any cracks. The climber can use it as one fixed point for setting up an anchor using sling material or cords made of Kevlar or Dyneema. For thin or deep tunnels, a rigid and tear-resistant material such as a Kevlar cord is ideal. A girth hitch is not used, as this would automatically move to the narrowest, and therefore least sturdy, point of the tunnel. Instead the climber inserts a ring-shaped sling through the tunnel so that this lies on the base – the most solid point of the tunnel.
CAMS
Camming devices are adjustable, wedge-shaped objects that are used for protection in alpine terrain. They usually work based upon a toggle principle to generate a sufficient friction effect on the walls in cracks in the rock. They can then absorb a longitudinal strain (fall).
Cam (Camalot) systems are used in alpine climbing. These are made from three or four segments and have one or two axles. Cam systems with one axle that have three or four segments are usually called “friends”. On a cam, the four segments are mounted on two axles. As a result, they can be contracted further and cover a larger crack width than with single-axle systems. In cam systems, (friends and cams), a flexible bar has become standard these days. The devices can thus also be positioned in horizontal cracks.
INSERTING CORRECTLY
Cams must be inserted in the pulling direction and lie flat to the walls of the crack. They are best inserted at the angle of the central segment. The rock into which the cam is inserted must be solid, as the strain creates an explosive effect double the tensile force (F) on the surfaces. The climber uses an extendible sling so that the cam’s position is not altered as a result of rope movement.
Camming devices should not be inserted too deep into the crack as otherwise the follower will not be able to get it out again!
NUTS
Nuts are non-adjustable, wedge-shaped (conical) camming devices which provide additional protection in alpine terrain and can absorb longitudinal strain. Unlike camming devices, they passively lock into a narrowing in the rock, while camming devices, on the other hand, actively expand in parallel slits. Nuts can have various basic shapes and are therefore categorized as stoppers, hexentrics or tricams. As with camming devices, they are subject to a certain standard in terms of strength. However, their shapes and sizes may vary.
Climbers also need a nut remover called a nut tool to remove nuts from the crack. This is pressed or hit lightly against the nut in the opposite direction from the main load direction on the nut – usually from below.
INSERTING CORRECTLY
Nuts must be matched to the crack’s size and shape. It is best if the nut is already stuck in the lower third of the rock and there is as much rock face surface area as possible. It must also be inserted in pulling direction. For soft rock such as sandstone or limestone, small rock outcrops may break off due to the explosive effect and the nut may fly out. The rock must therefore be solid, as the strain creates an explosive effect of up to four times the tensile force (F) on the surface.
