A decade of success for viikinmaeki STP

摘要

Drill and blast has been used for both underground and surface excavations. Underground, extensive lining and support works were required whilst above ground construction of houses and a bridge was underway. All this has been carried out at the same time and, in addition, the existing underground wastewater plant had to remain in operation. Final designs, especially those related to access, had to be extremely accurate, as alterations during construction could impact upon the construction schedule. However, despite these huge logistical pressures, construction progressed successfully and excavation of the new extension was completed on schedule, in January 2002. No major problems have arisen from the coexistence of the treatment plant works and neighbouring housing works, and no major damage was caused to the existing structures by blast vibrations. Detailed preplanning and tight cooperation during the excavation phase between the owner, designer and contractor ensured the advance through the critical weakness zone progressed smoothly.