EPC project for cofferdam and backfill on Heng river (Qingdao Iron Co.,ltd east & west workshop relocation project, First &Second section). Construction scale: the beach backfill area is about 2,500,000 m², the cofferdam length is about 3.3 km. The project is divided into two sections, backfilling area in first section is 64 million m², cofferdam length 1.2km; backfilling area in second section is 1,860,000 m², cofferdam length 2.1km. Cofferdam adopts sand bag and masonry revetment; Cutter-suction dredger will be used for reclamation construction. The project total investment estimation is ￥90 million .