"Rolled-up waterproof sheets are inserted into a soil/cement wall that has been mixed and homogenized with a trencher. The rolls are then unraveled and pulled sideways, to create our vertical seepage control wall. Since this method drastically reduces the number of joints in comparison to previous methods, seepage control performance is greatly enhanced" - Shimizu-Japan (http://greenzonecorporation.webatu.com/environment/pdf/env_2007_e_p5-22.pdf). A sample from the Tohoku Engineering Expo.
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