Arrangement for fire fighting

摘要

A method and an apparatus for punching a piercing tool through a wall shell structure and for feeding fire-retardant medium to the object on fire. At the outermost end of the rescue boom (3) there is a piercing device (6), which comprises an elongated piercing tool (7). The piercing device (6) comprises an actuator for punching the piercing tool (7) through the shell structure (8) by a longitudinal movement (8). The actuator comprises at least one spring member (34) for providing a longitudinal impact. <IMAGE>