In accordance with the inspection manuals developed for each type of facility, we will inspect the facilities to check the soundness thereof about once every five years. Inspection results will be disclosed to the public and used as fundamental data for facility maintenance and management.

We will carry out an in-depth investigation for repair and rehabilitation when structurally serious defects, damage, and deterioration are detected.

Road construction in a limited Right-of-Way or in a mountainous terrain may require earth cutting with steep grades using ground anchors to reduce the adverse effects to surrounding area.

A large force is exerted constantly on a ground anchor to prevent the collapse of the ground. It is therefore necessary to inspect the ground anchor periodically to ensure safety.

If defects, damage, and deterioration are detected, we will perform an in-depth investigation of the ground anchor itself and the entire slope.

Bridges and road structures made of cement concrete and/or structural steel are likely to deteriorate with time or be damaged over the course of many years in service. In order to keep these social infrastructures in service safely over the long term, appropriate repairs must be carried out.

In repair design, we will plan and design the appropriate solutions based on the results of the inspection and investigation.

Standards and guidelines for design of bridges, roads, and river structures have been updated frequently. Therefore, in some cases, it may be difficult to use these facilities due to high social demands. In such cases, it is necessary to upgrade these facilities as needed, such as increasing the load-carrying capacity, widening the road width, or strengthening the structures.

We will then implement the necessary rehabilitation and strengthening design of each structure to accurately respond to the required needs.

Every time bridges are hit by a major earthquake, the seismic performance level required by new findings will increase. 

The bridges constructed in accordance with the previous standards and guidelines need to be seismically strengthened to ensure safe and sustainable use for an extended period of time. We verify the present seismic performance level of each existing bridge and carry out seismic retrofitting design to meet the latest seismic requirements.

Many of the facilities in service today have already been more than 50 years old. The proper maintenance and management of these facilities will require a huge amount of costs. However, we have financial constraints.

Therefore, we prepare a life-extending repair plan for these facilities, including the prediction of future deterioration with time and implementation of necessary measures at the most effective time so that the life-cycle costs can be minimized.