This paper presents the monitoring horizontal and vertical displacements of railway
which heavy cranes run on using special geodetic techniques for the purpose provaiding
rialway stability and safe working cranes on it. To quaranty that heavy crane
s work safly, a
rialway should be just horizontal– a small error of milimeters leveling is allowed according
to working conditions for cranes. A rialway shoud also maintain its spaces to facilitate the
crane motion on it. Monitoring railway vertical displacements involve measuring the
relative vertical displacements of target points that are distributed along the railway in two
cases: static and dynamic. vertical displacements determined by precise leveling which are
performed using digital high accuracy level. The precise leveling measurments of target
points have been connected to stable benchmark that are located in surrounding terrain of
railway for purpose of further studies. In this paper the alignment method was used to
monitoring the railway horizontal displacements using digital rulers and total station
provided by a prism fixed forcely on the railway. This is done by measuring the small bias
angles of the targat points which are distributed along the railway. This research has
illustrated the efficiency of alignment method in order to calculate the horizontal
displacements of railway axis.
