Concrete anchors are devices used to attach objects to concrete surfaces. They come in a variety of types and sizes, each designed for specific applications. Some common types of concrete anchors include expansion anchors, undercut anchors, and adhesive anchors.
Expansion anchors (eg Throughbolts, Shield Anchors or Drop In Anchors) are the most commonly used type of concrete anchors. They are made of a metal rod with a flared end that expands when a nut is tightened. These anchors are inserted into a drilled hole in the concrete and then expanded to create a secure hold. They are suitable for light to medium loads and are commonly used to attach handrails, light fixtures, and other items to concrete surfaces.
Undercut anchors (eg Thunderbolts) are similar to expansion anchors, but they have a unique design that allows them to be inserted into a pre-drilled hole in the concrete. These anchors are then expanded, creating a secure hold that is not dependent on the strength of the concrete. They are suitable for heavy loads and are commonly used to anchor machinery, large structures, and other items that require a very secure hold.
Adhesive anchors (eg Chemical Anchors) are another type of concrete anchor. These anchors are inserted into a drilled hole in the concrete and then filled with an adhesive. The adhesive hardens and creates a secure hold. These anchors are suitable for light to medium loads and are commonly used to attach items such as shelves, signs, and other items to concrete surfaces.
In conclusion, concrete anchors are an essential tool in construction and are used to attach objects to concrete surfaces. They come in different types such as expansion anchors, undercut anchors, and adhesive anchors, each with unique characteristics, that can be used to suit different applications and loads. It is important to choose the right type of anchor and to follow the manufacturer's instructions for proper installation to ensure a secure and safe hold.