PRECISION IMPROVES FOR GRASP TO CHANGE OF THE TUNNEL LINING OF THE ROAD TUNNEL

Abstract

 The surface to line of the expressway tunnel offered open is often dirty by a soot and oil, contamination water and eluviation thing. In addition, the measures that installed a raw water transmission gutter are performed that a leak of water often produces the tunnel constructed in Yaita method of construction and covers the occurrence point to change such as leaks of water. By these factors, as for the image shooting check of the run type, there is concern to influence accuracy of the grasp to change in the check by the proximity viewing from the start. This article carried out the washing of the surface to line for the purpose of further improvement of the grasp to change to occur on the surface to line and examined influence to give the grasp that washing changed and examined the effectiveness of the transparence type raw water transmission gutter for the purpose of the visualization of changing it of the point covered by an installed raw water transmission gutter.