PURPOSE: To make it possible to display sufficient durability to the natural external force by connecting between a submarine base and its terminal, and between a turning passage installed in the terminal and the moored object respectively by a rigid pipe-form material and a hollow joint connected thereto.

CONSTITUTION: A base 1 installed at the bottom of the sea in a submarine oil field, etc., and a mooring terminal equipped with a turning seat 3 for mooring a moored object, such as a ship, etc. and a turning distributor 4 are connected with a column 6 composed of a rigid pipe-form material and at least one piece of hollow joint 7. Besides, this terminal 2 and the moored object 5 are connected with a connecting pipe body 8 composed of rigid pipe material, an elbow 9 and at least 2 pieces of hollow joints 7. And all the hollow joints 7 connect a pair of yokes 20, 21 in free command of bending through a trunnion 23, etc., and the hollow part is constituted to be able to tightly seal the hollow part against the external pressure and internal pressure.