Design of a Mechanical Device to Applique the Direction of Cross-Section on Rural Road Projects

摘要

The prism is used with the method of rectangular coordinates of the direction of cross-section on a road project. It is difficult to apply the direction of the cross-section in the intermediate point of curve by prism. Currently, the use of an electronic distance measuring to determine the direction of a cross-section both on the horizontal curve and at the alignment is considered to be more accurate and faster in relation to the other available instruments. However, electronic distances measuring are expensive. A simple mechanical device has been designed to apply the direction of the cross- section both in the intermediate point of curve and at the alignment as precise as that in prism. The structure of the mechanical device and its usage has been explained in this study. In addition the precision of the vertical direction was determinated experimentally, a case study concerning with subject has been included.