초록 ▼

A cofferdam for closing off underwater openings in ships\hulls and the like includes a box-like structure having a flat wall of a size and configuration for covering a ship\s openings, with peripheral walls for extending around the flat wall and around the opening for sealingly engaging the ship\s h

A cofferdam for closing off underwater openings in ships\hulls and the like includes a box-like structure having a flat wall of a size and configuration for covering a ship\s openings, with peripheral walls for extending around the flat wall and around the opening for sealingly engaging the ship\s hull and defining a chamber around the opening. Conduits are provided for communication with a pump for pumping fluid or water from the chamber of the cofferdam and for venting the dam either to atmosphere or the water for filling the cavity. Fastenings include J-bolts in one configuration for securing the cofferdam to grill work and the like inside a opening to a sea chest, and a hogging type rigging in another embodiment for securing where grill work and the like is not available. The cofferdam is constructed of wood for providing buoyancy in water and includes reinforcing bars extending across the face of the dam which are in the form of closed box beams for providing additional buoyancy.

대표청구항 ▼

A cofferdam for closing off underwater openings in ships\hulls, comprising: a first wall constructed of a plurality of sheets of marine plywood laminated together having a generally planar configuration defining a stepped portion extending around the perimeter thereof, and dimensioned to exceed the

A cofferdam for closing off underwater openings in ships\hulls, comprising: a first wall constructed of a plurality of sheets of marine plywood laminated together having a generally planar configuration defining a stepped portion extending around the perimeter thereof, and dimensioned to exceed the area of an opening to be covered in a ship\s hull; a second wall constructed of multiple wooden beams laminated together defining a step extending along the entire length of said second wall, said second wall extending around the perimeter of, and at right angles to said first wall for engaging said ship\s hull around said opening for spacing said first wall a predetermined distance from said ship\s hull for defining a cavity therebetween; said step and said stepped portion defining a stepped overlapping joint extending around the perimeter of and connecting said first wall and said second wall together at the intersection thereof; seal means extending around the periphery of said second wall for sealing the engagement thereof with a ship\s hull; and mounting means for securing said cofferdam to a ship\s hull for covering an opening therein.