A surveying vehicle and a method for surveying the longitudinal profile of tunnels

摘要

Railway tunnels, cuttings and similar narrow passages are surveyed by a distance-measuring instrument 17 which is moved along the passage and is associated with an odometer 9. The instrument 17 consists of a laser transmitter 19 and a receiver 20 with a common optical axis 21 in a plane perpendicular to the axis of the passage. During each run of the apparatus along the passage, the optical axis 21 is at a fixed angular setting so that the instrument 17 measures a particular longitudinal profile of the passage. The instrument makes several runs, measuring a different longitudinal profile 32-37 each time. IMAGE