Abstract: The present invention relates to a large floating structure used for a marine airport and the like and, more particularly, to a large floating structure in which the large floating structure itself has a wave absorbing function, whereby the need for a breakwater etc. is eliminated, and the installation of a separate wave absorbing structure at the outer periphery of the large floating structure is not needed, whereby an upper deck can be utilized effectively. For this purpose, under an extending portion on the up-wave side of the upper deck of large floating structure, for example, many box-shaped floating bodies arranged in a zigzag form and lattice-shaped connecting members are provided as a wave absorbing structure depending from the extending portion.

Abstract: A floating type anti-oil anti-impact anti-wave barrier includes structure for intercepting oil floating on the water, for mitigating an impact force exerted by a ship or the like, and for intercepting waves. The barrier can collect oil which has flowed out onto the sea to prevent the oil from dispersing, and the barrier can be protected from damage caused by a ship, by drift, by waves, etc.

Abstract: A floating-type anti-oil, anti-impact and anti-wave barrier includes means for intercepting a flow of oil floating on the water and diverting the oil in directions at right angles to the original direction of flow, means for mitigating an impact force exerted by a ship or the like, and means for intercepting waves. The barrier comprises a first float formed by serially arranging at regular intervals a plurality of elongated floating boxes in their longitudinal direction, a second float formed exactly in the same manner as the first float and disposed parallel to the first float with opposed side surfaces of the floating boxes forming the first and second floats being located at staggered positions relative to each other. Floatable spacers having shock-absorbing and intercepting functions are interposed between such opposed side surfaces of the floating boxes in the first and second floats chains or ropes moor the respective floating boxes to each other.