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Making an Entrance:

This article describes one of Greece's largest and most complex current engineering projects, an immersed tube crossing at the entrance of the Amvrakikos Gulf at Preveza. This design-and-build contract was let in January 1997 to a joint venture, which is 25% European funded, between Christiani & Nielsen and the Greek firm Technical Company of General Construction. The design process is time-consuming, because the site is highly seismic. Additional engineering works on the Preveza side will continue the crossing to the current end of the west coast national road on the town's boundary. There will be eight submerged reinforced concrete units, four on each side, with steel formwork; each unit has a 4m-wide traffic lane and a 1.3m-wide maintenance sidewalk, to carry the road under the sea for 909m. The additional tunnels, under the land, will be cut-and-cover, with permanent diaphragm walling. Everything is being done to quality control standards, and the project is one of the first in Greece to be done to the International Standard ISO 9001. At present, the project is scheduled to finish in 1999.