Since the establishment of JTA in 1975, it aims to contribute to the conservation of national land as well as prosperity of public welfare by investigating and researching the tunnel construction and maintenance management to improve the technology and promote the usage of underground space. In April 2013, this organization has changed to general incorporated association and have been actively working ever since.
The progress of tunnel technology over the past 40 years has been remarkable. The technological change has been made such as, the standard of mountainous tunnel construction method has been changed from timber lagging method to NATM while for urban TBM the standard changed from open type to shield type. During this period, many big projects progressed along with high economic growth. However, at the time of economic change such as oil shocks and collapse of bubble economy, the construction industry was mostly affected compare with other industries. In these times, various tunnel technologies have been developed with the aim of improving construction efficiency, economy, safety, and the environment. Tunnels in Japan have greatly contributed to the development of infrastructure such as railways, roads, power, communications, water and sewage.
JTA has contribute to the development of each tunneling technologies while taking advantage of the merit as member of industry-government-academic. In order to meet the expectations to the association, we will continue to be more active while making use of these merits. In addition, we will promote technology transmission and quality improvement of tunnel engineers in japan and as a member of ITA, we will make efforts to contribute to international technology exchange for construction of safer “tunnel and underground space” and development of maintenance management technology.
We look forward to your continuous support.
JAPAN TUNNELING ASSOCIATION