Anchor Bolt Assemblies are used extensively in underground mine workings and are difficult to install in soft rock conditions. This is essentially because the initial grip of leaves of the expansion shell with the wall of the hole in which the anchor bolt is to be secured is difficult to obtain. These are used in mining operations.
Anchor bolt is a heavy hex bolt made of alloy steel. It is used in structural steel connections in heavy construction. It is used to attach objects or structures to concrete. It consists of a threaded end, to which a nut and washer can be attached for the external load.