| 摘要 |
PCT No. PCT/GB90/01138 Sec. 371 Date Feb. 24, 1992 Sec. 102(e) Date Feb. 24, 1992 PCT Filed Jul. 24, 1990 PCT Pub. No. WO91/01250 PCT Pub. Date Feb. 7, 1991.A floating inflatable structure is used to house a vessel for repair while it is afloat. The structure has inflatable walls containing water ballast. The height of the structure above the water can be adjusted by either introducing or expelling water ballast from the foot of the walls. Alternatively, a separate water ballast tube may be provided, the height of which can be adjusted relative to the structure.
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