The shortage of construction workers is one of the biggest issues in construction industry. Therefore, MLIT¹⁾ is promoting “i-Construction” for productivity improvement of construction site. As examples of “i-Construction” of CRDB²⁾, we introduce full scale use of ICT and promotion of using three-dimensional data.

1) Ministry of Land, Infrastructure and Transport

2) Chugoku Regional Development Bureau

Prestressed ground anchors are broadly used for stabilizing slopes around reservoir. Appropriate inspection and timely maintenance of them is required against deterioration due to aging and severe field condition such as fluctuating reservoir and ground water level. In general, numerous anchors are placed in a slope which is very steep and large area. This field condition made the inspection work difficult and requiring great effort. In order to reduce this effort, primary screening to extract certain anchors which need further diagnosis was tried using a popular-price multicopter. Through this study, the optimal way of observation was identified such as a newly developed form for recording an inspection result and appropriate distance for shooting pictures of a target structure. Roughly, 70% of work load could be reduced by this method.

Terrestrial laser scanners are used by surveying companies as devices that perform three-dimensional measurement. UAV mounted laser scanner is the latest measurement instrument realized by UAV ability innovation and laser miniaturization, and it is expected to expand in the future.

By using two types of instruments in combination, we can verified the method for improving efficiency of measurement work.

“i-Construction” means the effort toward productivity improvement on construction work sites by full utilization of information and communication technology (ICT), with a view to optimize the whole construction production processes. And The Ministry of Land, Infrastructure, Transport and Tourism aims for including improvement of the business environment and working conditions, and the realization of a safe construction site in the construction industr