Water Stop Wall "Hexa Gate Plug"

The Fukuoka City Water and Sewer Bureau has adopted the Hexa Gate Plug (hereinafter referred to as HGP) for the construction of the sewer system in the Fukuoka (Imaizumi 2-chome 2) outer area (Contractor: Ando Hazama). This project is part of the "Rainbow Plan Tenjin," a rainwater drainage facility development plan aimed at preventing flooding damage due to expected guerrilla rainstorms in the Tenjin area. The project involves the construction of a rainwater conduit, and this HGP is installed as a temporary wall within the existing Chubu No. 7 main line, where the inspec-through line (shield method) connects, protecting the shield arrival section from rainwater.

【HEXA TIMES】No.1 The Hexa Gate Plug (hereinafter referred to as HGP) has been adopted for the construction of the No. 3 rainwater discharge pipe of the Tachiaigawa main line ordered by the Tokyo Metropolitan Bureau of Sewerage (Contractor: Shimizu Corporation). In May 2021, this HGP was installed on the Hamagawa main line and is being used as a rainwater inflow prevention measure during the removal of the temporary wall at the connection point with the Second Samezu main line. Since the tunnel cross-section is not circular but has a special shape, a pressurized tube seal type was adopted for the water stop mechanism instead of the conventional rubber ring type (Hexa Plug type). Additionally, considering the safety of the workers, a highly operable watertight door has been installed. There have been several heavy rain events since the installation, but the sealing performance has been good, ensuring safety within the tunnel, and the construction has been completed successfully.