Solid and Hollow Wall Anchors (69/96) -- Carpentry Refresher Program Manual

Solid and Hollow Wall Anchors Topic 5 – Solid and Hollow Wall Anchors Anchor bolts embedded into concrete as is it is still fluid. They are set at specific intervals and must be of minimum diameter and embedment according to their application. They are typically irregularly shaped or contain a bend to prevent them from turning during fastening after the concrete is set. While the placement of anchor bolts is crucial, there are methods to allow movement of the bolt after the foundation has been placed. Methods include using sleeves to leave a void around the bolt and grouting an anchor bolt in a pocket that has been formed out (see below). Anchor bolts are also referred to as “cast-in-place” anchors. This method of placing bolts in concrete as it is setting is the most effective and economical method of fastening materials to foundations. The drawback, however, is that its placement must be extremely accurate as they are unable to be moved. Any errors in placement will render the anchors useless. Concrete Inserts Another method of securing material down to concrete is through the use of cast-in-place inserts. The contain a threaded female end which sits flush with the top of the concrete. After the concrete is set, bolts are fastened into it.