Dynamic undercut anchors - Liebig Ultraplus

Dynamic Anchors

LIEBIG ULTRAPLUS® Dynamic Anchors

What is a dynamic anchor?

Dynamic anchors are load-bearing industrial fastenings which are used to secure objects such as plant or machinery to concrete structures, as well as reinforcing such structures to help them withstand varying dynamic loads or seismic movements. Typically fabricated from zinc plated carbon steel or stainless steel, these anchors are a vital component of today’s civil engineering industry as the need for guaranteed structural safety is higher than ever before.


How do they work?
Anchors are sometimes cast directly into the concrete during the pouring process or more typically they are post installed afterwards by drilling into a precast concrete structure. Post-installation anchors tend to be either mechanical or chemical in design and are often suitable for use in both cracked and non-cracked concrete. Mechanical anchors, such as the dynamic undercut anchor, work by utilising an enlarged opening inside a drilled hole to create an interlocking action between the concrete and the anchor. Chemical anchors, on the other hand, require the addition of a mortar-based adhesive to the drilled hole before the anchor is inserted. Once this mortar sets, it creates a sealed bond between the anchor and the hole. Increasing the diameter and depth of the drilled hole increases and maximises the load-bearing capacity of the anchor.

What are their applications and advantages?
Anchors are found in all aspects of physical infrastructure. Their ability to endure a range of dynamic loads from regular machinery operation such as hydraulic ramps and conveyor belts to those occurring from construction activities and even road traffic means that they have a wide variety of industrial applications. Furthermore, such is the load-bearing capacity of these anchors that they are also able to resist shock, dynamic and seismic loads.

How do they resist shock loads?

Shock loads are instances of short-duration but high-force impact on a structure, such as those experienced in a vehicular collision, elevator failure or even an explosion. Structures which utilise anchors designed to resist shock loads will be more likely to withstand the effects of such an impact and minimise the consequential risks to for people or the surrounding structure.

How do they resist seismic loads?

Seismic loads are the forces experienced by a structure during a seismic event, such as an earthquake. These events are typically of varying duration and severity, and as such most structures in the affected area will be at risk of serious damage and potential collapse. By using anchors which are designed to withstand seismic loads, the risk of structural damage and collapse will be significantly reduced which has countless advantages for ensuring public safety and preserving human life.