is crimped onto the protruding end in situ at an installation site the anchor device 10 is formed under factory conditions by inserting the elongate member 18 into the pipe 16 when the pipe is of a regular shape ie is not deformed the pipe which encloses the elongate member over a substantial portion of the length of the elongate member is placed in a suitable press and is deformed in one or a plurality of steps into the shape shown in the drawing the deformed pipe has peaks and troughs with a generally smooth transition between each peak and adjacent trough thereby imparting to the pipe an overall generally sinusoidal shape the undulations or sinusoidal peaks are spaced apart by a distance 26 which varies according to requirement the hole 12 is formed in the rock face using any appropriate technique known in the art and the anchor device 10 is placed in the hole with the pipe 16 embedded in grout or other settable material 28 which fills the hole the settable material is normally injected into the hole using any suitable placement apparatus after the pipe has been inserted into the hole if the restraining component 22 is a nut then the washer and the nut are engaged with the protruding end 20 after the settable material is injected into the hole through its mouth on the other hand if the restraining component is in the nature of a.