Bolts as fixture and protection in mountain sports
Bolts come in different areas of climbing and mountaineering use. Sport climbing they are found in most areas as grateful intermediate backup that can be hooked into the an express Sling Velvet rope within seconds. Bolts make sure modern sport climbing and are often the only alternative for difficult routes, where a hedge with mobile backup equipment is as good as closed.
In multi rope lengths and in the Alpine area also often found bolts on stands or descent slopes. In addition find bolts go in many related sports such as the via ferrata, canyoning and caving application.
The big advantage is the simple, fast and convenient use of the existing hooks to secure.
Types of anchors
Bolts are anchored by means of a drilled hole in the rock. Exists now in many different forms. They can be distinguished depending on the fixing points in the hole in two categories:
Composite hook: the connection to the rock by means of special composite mortar is indicative of this genre the drill hook. There are different versions that work on the basis of the composite hook. The most famous is certainly the so-called “Buhler hook”. Composite hook are common even under the terms Klebebohrhaken or anchor.
Mechanical anchors: these include in particular express anchor and anchor. They are driven into the hole and by expansion in the rock anchored in the port. It is therefore often frictional engaged systems. In soft rock also form-fitting hooks can be used, less building explosion.
The great advantage over composite hook is in the immediate operational readiness. So, it can be set up to route from the ground, from hook to hook.
Regardless of the type of the drill hook this should be made always in stainless steel to counteract corrosion. A correctly attached bolts in stainless steel provides a solid fixture then over many years and brought many overseas relief at the right moment.