Adjustable length shock absorbing arrangement for a marine structure

摘要

Annular, hollow upper and lower members are secured to an upwardly extending supporting leg of an offshore structure to project therefrom in generally the same plane. Each of the members includes a cylinder with the upper and lower cylinders being axially aligned and projecting from an end of each of the members; each cylinder also has a smaller diameter than its respective member to provide an annular space therebetween and each cylinder has an end portion within its respective member. Yieldable material is molded in the annular space between each member and its cylinder and is provided with longitudinal recesses therein to accommodate movement of the cylinder relative to its respective member. A longitudinal stem is provided for securing to and extending between the upper and lower cylinders with a support thereon for supporting a cylindrical bumper on the stem for rotation relative thereto. Second yieldable material is molded between the cylindrical bumper and the stem. The cylindrical bumper comprises three sections, and the second yieldable material includes an upper spider molded within an upper section of the cylindrical bumper and a lower spider molded within a lower cylindrical section of the bumper which is longitudinally spaced from the upper bumper section by a central hollow bumper section secured at its upper end to the upper bumper section and at its lower end to the lower bumper section, whereby the length of the cylindrical central section can be varied as desired by varying the length of the central bumper section.