There are several different driving forces behind the development of today’s modern robotic equipment. A need for efficiency, safety and economy. Most robotic units will help in this respect, by allowing substantially higher shotcrete output and even set-up times may be reduced, using less people in the process. An increasing tendency to produce final linings using shotcrete rather than cast in situ concrete. The shotcrete placed will therefore have to satisfy quality and durability requirements normally used for permanent concrete structures. Computer controlled dosage of accelerator and other functions that contribute to a more uniform shotcrete quality. Thickness control and measurement contribute to providing the feature which has always been missing for sprayed liners EHSQ regulations especially relating to the generation of dust undergroun.