ABSTRACT
The shield tunnelling is a tunnel construction method that can prevent the generation of noise and dust on the ground surface, and it has been often used in areas where reduction of impact on the surrounding environment is particularly required. To further reduce the environmental burden of the shield tunnelling method, an environment-friendly tail grease namely “SEALNOC BD” was developed by replacing the conventional material of tail grease used for a water tightness mechanism of a Tunnel Boring Machine (TBM) with a biodegradable and low-toxic material. Through the performance test and the application to actual construction works of this developed product, it was confirmed that the basic performance was equivalent to or more than the conventional product. Furthermore, this product has acquired the first “Eco Mark” certification as a tail grease, under the only Type I environmental label in Japan in accordance with the ISO 14024.
