HIGH PERFORMANCE INVESTIGATION OF CRACK IN LINING CONCRETE BY LASER MEASUREMENT SYSTEM

Abstract

This paper presents an investigation method of crack in lining concrete of old tunnels. Especially, the present paper focused on the crack investigation system by laser measurement method. The measurement principle of crack was described firstly, and each detail of the crack evaluation system was presented. The performance of usual measurement car and developed measurement car was discussed. The effectiveness of new system was presented based on the investigation of crack in a tunnel.