Method for position location and placing of safety barrier posts along a road, involves using a theodolite fitted with a global positioning device (GPS)

摘要

The method includes making an automatic theodolite survey along the road centreline using a computer, to calculate a theoretic curve shifted from and parallel to the road centreline. The safety barrier is approximately parallel to the road centerline of traffic circulation. the barrier consists of a number (n) of post fixings (22), where n greater than 2. Spacing of supports (25) is made with reference to the first support (22). The method of determining the theoretic positions of barrier supports (25) consists of: - making an automatic theodolite survey along the road centerline from a line (9) passing through the road centerline; - transmit and record the points measured in a micro-computer (6); - introduce into the computer (6) a first lateral spacing value (21) between the road centerline curve (9) and the position of the safety barrier; - enter into the computer (6) a second value corresponding to the minimum spacing of barrier fixing holes or a whole multiple of this spacing; - enter a third value into the computer (6), which corresponds to the position of the first barrier support (22); - calculate a theoretic curve (23) shifted from and parallel to the road centerline, passing through the first support (22). The measurements and values are determined with reference to at least two perpendicular and horizontal axes. An Independent claim is included for a barrier post base fixing vehicle designed to follow the determined barrier route and an fix post bases at the determined positions