Okachimachi Tunnel


Xypex products were used to waterproof various areas of the Okachimachi Tunnel which forms a section (495 metres) of a new artery created for Japan’s famous Bullet Trains linking the Tokyo and Ueno Stations. Design was under the supervision of East Japan Railway Company and the tasks involved the expansion of the Tokyo Station and the construction of high speed track through the most congested business district of Tokyo, demanding the most sophisticated civil engineering skills and techniques. The construction was performed by Kumagai Gumi Co. Ltd., one of the foremost tunnel contractors in the world. Kumagai Gumi has used the Xypex system successfully on previous projects, and this was a positive factor in the selection of Xypex for the repairs and coating of specified areas in the Okachimachi Tunnel.