Recent Concrete Technologies for Tunnel in Japan was introduced in China Tunnel Summit 2008

Advanced Concrete Technologies for Tunnel Lining in Japan was Introduced in China Tunnel Summit 2008 in Shanghai

China Tunnel Summit 2008 was held during March 20-21, 2008, at Millennium Hongqiao Hotel in Shanghai, the P. R. China. On this occasion JSCE concrete committee was invited to present the recent advanced concrete technologies for tunnel lining. This seminar was organized by Merisis Consulting Co., Ltd., mainly for tunnel engineers to deliver the latest information of tunnel construction and operation, raise the level of engineering technique, and to ensure the quality of projects.

On behalf of JSCE concrete committee Dr. Toshiharu KISHI, Associate Professor, Institute of Industrial Science, The University of Tokyo, introduced advanced concrete technologies for tunnel lining developed by member companies of JSCE with a title of “Improving Concrete Structure to Prolong Concrete Durability in Tunnels”. His presentation included,

ü Main factors which affect the surface quality and durability of concrete

ü Methods taken in construction for concrete in tunnels, such as shotcrete, spraying ECC, high durability segment, segment possible for shave cutting, advanced fire-resistant concrete incorporating synthetic fiber, cold joint-free high quality tunnel lining compaction system, total curing method using balloon for tunnel lining concrete, self-healing concrete, etc.

ü Methods used in inspection and maintenance, such as integrated inspection system equipped vehicle, backfill grouting, advanced patching method, etc.

Damages to and rehabilitation of tunnels caused by Chuetsu earthquake in 2004.

After the presentation, several interests were shown and questions raised regarding the application of ECC for both cast-in-place tunnel lining as well as the shotcrete method and the balloon method for curing of cast concrete.

Remarks: Special thanks to JR East Co., Ltd., Kajima Co., Ltd., Nishimatsu Construction Co., Ltd., Maeda Co., Ltd. and Taiheiyo Cement Co., Ltd. for providing presentation materials of their technologies.