The LIEBIG ULTRAPLUS® Option One
Undercut anchors are one of the strongest mechanical anchors you can find in the market. Hence they are used in high risk applications in such dangerous places as nuclear power plants, or in high loading applications such as roller coasters. In short, where risk to human safety as a result of anchor failure is high or where anchor failure has other catastrophic consequences.
When installing the anchor, the expansion segments are safely driven drown inside the pre-drilled hole. The undercut is created via a spring action which automatically expands the undercut segments / undercut keys of the anchor in to the pre-cut void within the concrete. This is what is called the positive mechanical interlock (the undercut connection). It does this without causing any expansion pressure inside the concrete. This positive undercut mechanism, is what ensures the reliable transmission of action load from the application to the concrete wall, floor or ceiling.
Undercut anchors are used in many ETA Option 1 application areas – option one being the designation for what is classed as the tension zone in a piece for concrete. This can be a concrete wall, concrete floor or concrete ceiling.
When we refer to tension zone we are referring to an area of the concrete which is or could become cracked. An anchor which as been successfully tested and approved to meet ETA Option 1 requirements means that it is suitable for use in those areas.
When selecting anchors one should always consider their use and suitability to ensure that they have been assessed and approved for safe use by European Technical Approvals / Assessments, the board ensures that all anchors are tested and proved to be suitable for use in specific base materials and conditions.