# US 2008/0184667 A1 · Concrete Reinforcement Apparatus and Method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2008/0184667 A1 - Document ID: US20080184667A1 - Status: Published application - Kind: A1 - Application number: 11/596,958 - Filed: 2005-05-12 - Published: 2008-08-07 - Earliest claimed: 2004-05-17 - Inventors: Riyadh A. Hindi - Web page: https://patentgrep.com/patent/US20080184667A1 ## CPC - E04C 5/0618: {Closed cages with spiral- or coil-shaped stirrup rod} - E04C 3/34: of concrete other stone-like material, with or without permanent form elements, with or without internal or external reinforcement, e.g. metal coverings (E04C3/36 takes precedence) - E04C: STRUCTURAL ELEMENTS; BUILDING MATERIALS (for bridges E01D; specially designed for insulation or other protection E04B; elements used as building aids E04G; for mining E21; for tunnels E21D; structural elements with broader range of application than for building engineering F16, particularly F16S) ## Abstract A reinforced concrete column (110) includes a plurality of axially oriented reinforcing steel bars (112) within a surface of the concrete column (110). A first spiral wire (114) within the surface of the concrete column (110), the first spiral wire (114) being around an outer circumference of the plurality of axial reinforcing (112) and a second spiral wire (116), the second spiral wire (116) also being within the surface of the concrete column (110). The second spiral wire (116) is around a circumference of the plurality of axial reinforcing bars and the second spiral wire (116) is opposed to the first spiral wire (114). ## Claims ### Claim 1 A reinforced concrete column comprising: a concrete column having an outer surface; a plurality of axially oriented reinforcing bars within said surface of said concrete column; a first spiral wire, said first spiral wire being within said surface of said concrete column, said first spiral wire being around an outer circumference of said plurality of axial reinforcing bars; a second spiral wire, said second spiral wire being within said surface of said concrete column and said second spiral wire being around a circumference of said plurality of axial reinforcing bars and said second spiral wire being opposed to said first spiral wire. ### Claim 2 The apparatus of claim I wherein said first spiral wire and said second spiral wire are steel. ### Claim 3 (depends on 1) The apparatus of claim 1 wherein said first spiral wire and said second spiral wire are 4 mm in diameter. ### Claim 4 A method of concrete construction comprising: constructing a form; orienting a plurality of reinforcing bars within said form; circumscribing said plurality of reinforcing bars with a first spiral wire; circumscribing said plurality of reinforcing bars with a second spiral wire, said second spiral wire opposing said first spiral wire; and pouring concrete into the form. ### Claim 5 A reinforcement for a concrete column having an outer surface and an interior, said reinforcement comprising: a plurality of axially oriented reinforcing bars disposed to be within the concrete column; a first spiral wire, said first spiral wire being disposed to be within the concrete column, said first spiral wire being around an outer circumference of said plurality of axial reinforcing bars; a second spiral wire, said second spiral wire being disposed to be within the concrete column and said second spiral wire being around a circumference of said plurality of axial reinforcing bars and said second spiral wire being opposed to said first spiral wire. ### Claim 6 (depends on 5) The reinforcement of claim 5 wherein at least one of said first spiral wire and said second spiral wire has a one inch pitch. ### Claim 7 (depends on 5) The reinforcement of claim 5 wherein at least one of said first spiral wire and said second spiral wire is continuous for greater than 180°. ### Claim 8 (depends on 1) The column of claim 1 wherein each loop of one of said first or said second spiral wire is spaced substantially 25 millimeters from a next loop of the same one of said first or second spiral wire. ### Claim 9 (depends on 1) The column of claim 1 wherein said concrete is high strength concrete. ### Claim 10 (depends on 1) The column of claim 1 wherein an axial force capacity of said column is at least about twenty-one percent greater than an otherwise equivalent second column having only a single spiral wire at the same spacing as one of said first or said second spiral wires. ### Claim 11 (depends on 1) The column of claim 1 wherein said column has a displacement of at least about forty-five percent more than an otherwise equivalent second column having only a single spiral wire at the same spacing as one of said first or said second spiral wires. ### Claim 12 (depends on 1) The column of claim 1 wherein said column has an axial capacity ratio that is substantially 0.97 of an otherwise equivalent second column having a single spiral only, said single spiral having a spacing substantially half a spacing of one of said first or said second spiral wire. ### Claim 13 (depends on 4) The method of claim 4 further comprising the step of spacing each loop of one of said first or said second spiral wire substantially 25 millimeters from a next loop of the same one of said first or second spiral wire. ### Claim 14 (depends on 4) The method of claim 4 wherein said concrete is high strength concrete. ### Claim 15 (depends on 4) The method of claim 4 wherein an axial force capacity of said column is at least about twenty-one percent greater than an otherwise equivalent second column having only a single spiral wire at the same spacing as one of said first or said second spiral wires. ### Claim 16 (depends on 4) The method of claim 4 wherein said column has a displacement of at least about forty-five percent more than an otherwise equivalent second column having only a single spiral wire at the same spacing as one of said first or said second spiral wires. ### Claim 17 (depends on 4) The method of claim 4 wherein said column has an axial capacity ratio that is substantially 0.97 of an otherwise equivalent second column having a single spiral only, said single spiral having a spacing substantially half a spacing of one of said first or said second spiral wire.