As long as the Yangtze wastewater pipeline
The project was conducted in three parts. 2.3 km HOBAS CC-GRP pipes DN 1200 to 2000 were installed for the first part, the second section consisted of 2.9 km DN 800 to 2000 and the third and longest part was established utilizing 7.4 km HOBAS pipes DN 800 to 2000. The complete line was built with gravity pipes and a stiffness of SN 15000. This enabled a cost efficient installation in great depths and weak soils. A maximal trench depth of no less than 18 m and an average depth of 7 m were required for the project. The extra-strong HOBAS pipe proved to be an intelligent and flexible solution that also ensures long-term stability. Due to the region’s leapfrog development over the last years, the maximum capacity of the local sewer system was soon reached. Apart from this and despite the city’s large scale investments in the network, the line was in such bad condition that the groundwater was threatened to be polluted. It was therefore absolutely essential to establish a new main leading to the local treatment plant. 12.6 km HOBAS SewerLine® were installed for this purpose in the Yiwu district Choujiang.