| 摘要 |
first and second supporting plates attached on the upper and lower ends of first and second circular pipe shafts installed centering around a hollow hole body and secured by means of a bolt to upper and lower mooring plates; a filling material made of an urethane foam and injected in the interior of the hollow hole body; first and second buffers of a circular disk into which a buffering material is filled formed on the outer peripheral surface of the hollow hole body; and first and second circular disks secured between the first and second supporting plates and the first and second mooring plates, to be coupled as a unitary body with the hollow hole body.
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