Naha submerged tunnel is composed of the 8 immersed tubes and will run about 1.1km long as an expressway. In March, 2002, production construction of the No.2 tubes in which our company received order was completed. For this construction, next innovative technologies were applied. 1) Steel concrete composite structure (full sandwich structure) was adopted in all member of the immersed tubes. 2) The steel shell was the loading on the barge by skid out method using the teflon boards and stainless steel boards. 3) The steel shell was mounted on the semi-sub barge, and it was towed to Okinawa. 4) The steel shell was moored in near pier of installation field, and high fluidity concrete was placed between steel plates in the condition floating at the water surface. 5) Three-dimensional coordinate measurement of the whole tube was carries out periodically, and the behavior of the tube body was grasped.
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