Hanzomon Subway Tunnel

Tokyo, Japan

BACKGROUND
In 1985 the 10.8 km stretch of Hanzomon Subway was constructed several meters below grade. During initial construction a 1” (2.5 cm) rubberized sheet membrane was installed as specified by engineers to provide the waterproofing protection required. Within one year the membrane system had failed in several places and was allowing water to penetrate the tunnel.

SOLUTION
The Krystol™ T1 & T2 waterproofing system was applied on the inside of the tunnel to effectively withstand hydrostatic pressure and stop water ingress. Shortly after installation of the Krystol™ waterproofing system, the tunnel was dry and ready for daily wear and tear of public transportation.

Product Krystol™ T1 & T2
Location Tokyo, Japan
Owner Teito Rapid Transit Authority (TRTA)

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Workers apply Krystol to inside walls of tunnel.


Where membranes have failed Krystol can go to work to arrest water ingress.