ABSTRACT
This essay introduces a surveying method for creating documents for maintenance policy making or basic documentation, whereby the shape of the lining surface of a deep shaft, especially those without scaffolding, is determined, properly extracting cracks, wall separation, leaks, free lime, and deformation. The shaft’s lining wall surface, which is one of the most important facilities, was surveyed using newly-developed digital video cameras. Because of their particular attributes, being a vertically long structure, inspection of the wall surface of shafts is extremely difficult through visual inspection at proximity unless there is some scaffolding; this has been a significant issue for executing inspections. The “damage/deterioration detection system for concrete structures” is originally an inspection system for highway tunnels that does not require the tunnel to be closed. However, by applying this system using newly-introduced digital video cameras, survey results that equal or outperform the previous proximity visual inspection method can be obtained without the need for scaffolding. The essay will describe the details of the system through two case studies, where site surveys were actually carried out in deep shafts.
