Floatable concrete block structure and method for manufacturing same
View Patent ↗A floatable concrete block structure is manufactured by fabricating individual concrete blocks on land, and then assembling and coupling the individual concrete blocks underwater or on a water surface. An assembly buoyancy chamber is formed inside by the first concrete block and the second concrete block, the inflow of water into the assembly buoyancy chamber is prevented by a first watertight packing, and so on, and the first concrete block and the second concrete block are coupled to each other by concrete columns.
1 . A method of manufacturing a floatable concrete block structure, the method comprising:
a first concrete block fabrication step of fabricating a first concrete block comprising a first concrete block body in which a buoyancy-chamber bottom surface is formed on an upper surface thereof, and a first watertight packing disposed on the upper surface of the first concrete block body in a form surrounding the buoyancy-chamber bottom surface, wherein the first concrete block further comprises a plurality of column rebar assemblies, each of which extends vertically from the first concrete block body and protrudes upward from the upper surface of the first concrete block body;
a second concrete block fabrication step of fabricating a second concrete block comprising a second concrete block body in which a second buoyancy chamber having an open lower surface and a plurality of first column through holes extending vertically are formed;
a first concrete block installation step of installing the first concrete block by submerging the first concrete block in water after the first concrete block fabrication step;
a second concrete block installation step of installing the second concrete block such that a concrete block assembly is formed by installing the second concrete block on the first concrete block after the second concrete block fabrication step and the first concrete block installation step, an assembly buoyancy chamber having a closed lower end is formed in the concrete block assembly by the second buoyancy chamber of the second concrete block and the buoyancy-chamber bottom surface of the first concrete block, and the first watertight packing is located between the first concrete block and the second concrete block and prevents water from being introduced into the assembly buoyancy chamber from the outside, wherein the second concrete block is installed on the first concrete block such that each of the column rebar assemblies of the first concrete block is inserted into each of the first column through holes of the second concrete block, and concrete-column through holes each having a closed lower end are formed in the concrete block assembly by the first column through holes of the second concrete block being covered by the upper surface of the first concrete block body;
a column drainage step of removing water contained inside the concrete-column through holes in which the column rebar assemblies are inserted after the second concrete block installation step;
a concrete column formation step of forming concrete columns coupling the first concrete block and the second concrete block to each other along each of the first column through holes after the second concrete block installation step so as to form a concrete block structure having the first concrete block and the second concrete block coupled to each other by the concrete columns, wherein by pouring concrete into the concrete-column through holes after the column drainage step, the concrete columns having the column rebar assemblies and the poured concrete integrated with each other are formed; and
an assembly buoyancy chamber drainage step of draining water contained in the assembly buoyancy chamber after the concrete column formation step so that the concrete block structure is floated to a water surface by the buoyancy of the assembly buoyancy chamber.
2 . The method of claim 1 , wherein the second buoyancy chamber extends vertically and has open upper and lower surfaces;
a third concrete block fabrication step of fabricating a third concrete block comprising a third concrete block body which has a plurality of second column through holes extending vertically and has a buoyancy chamber ceiling surface formed on a lower surface of the third concrete block body so as to cover an upper side of the assembly buoyancy chamber;
a third concrete block installation step of installing the third concrete block on the second concrete block after the second concrete block installation step and the third concrete block fabrication step is comprised; and
at the concrete column formation step, the concrete column is formed along the first column through hole and the second column through hole so as to form the concrete block structure having the first concrete block, the second concrete block, and the third concrete block coupled to each other by the concrete columns.
3 . The method of claim 1 , wherein the second buoyancy chamber extends vertically and has open upper and lower surfaces; and
a cap concrete formation step of forming a cap concrete on the second concrete block so as to cover an upper side of the assembly buoyancy chamber after the concrete column formation step is comprised.
4 . The method of claim 1 , wherein the second concrete block is provided with a second watertight packing disposed on an upper surface of the second concrete block body in a form surrounding the second buoyancy chamber; and
at the second concrete block installation step, a plurality of second concrete blocks are installed in multiple layers on the first concrete block, and the second watertight packing is located between the second concrete blocks installed to be vertically adjacent to each other so that water is prevented from being introduced into the assembly buoyancy chamber from the outside.