The term anchor bolts are used generically in the construction industry to describe anchors or fixings that are used to fasten or attach various objects securely in place to different materials like concrete, block, brick, stone or plaster. The safe anchor bolts are designed and manufactured in a great range of different lengths and diameter to cater for specific applications and use in a variety of different base materials.
When used to attach objects to a base material the following factors will determine if the anchor bolt will be able to efficiently and effectively withstand the load imposed by the object on it, in the main it is the design features, dimensions and material used to manufacture the bolt from.
Anchor bolts are designed with the purpose to handle the different load requirements which can be imposed on it. The different loads can be either pulling, tensile or tension loads experienced on the axis of the anchor bolt or shear loads or forces which acts directly across the axis and along the base material surface. There are also other instances, during which both types of loads can be imposed on the anchor bolt which is referred to as a combined load, when both pulling and shear loads act onto the axis of the anchor bolt.
One example of the application of safe anchor bolts are when a steel column is attached to a reinforced concrete foundation with the two structural elements being connected by means of anchor bolts which serves as the connection between the two structures. The attachment of non-structural elements to a building takes place when for example a facade system is connected with anchor bolts onto a reinforced concrete wall, concrete slab or floor
Liebig manufactures anchor bolts which are concrete anchors that can be classified as a torque controlled expansion anchor. They are manufactured to consist of a threaded portion with either a nut protruding on top or with a hexagon bolt head. Liebig bolts are manufactured from carbon steel and are also readily available with zinc galvanised coating. After installation through the baseplate, the nut or the bolt head on the high-performance anchor is tightened to provide the required clamping force, that will withstand the loads from the baseplate or the object that is to be fastened.
Liebig bolts which are fully assembled has an expansion clip or steel expansion shield which are permanently attached on the lower end of the anchor bolt. The required expansion to withstand the loads imposed is created when the expansion cone is pulled through the expansion shield when the hexagon bolt head or nut is tightened