Construction unit

Claim 2

A load-bearing structural unit comprising a hardened cementitious body portion of high compressional strength and a substantially continuous sheetlike tensile member integral with and contiguous to said body portion extending substantially over the entire area of said body portion and disposed at a substantial distance beyond a substantially centrally located plane of said unit and a structural stress resistant bonding joint between said tensile member and said body portion, said bonding joint comprising a plurality of closely spaced portions of said tensile member embedded and extended into said body portion in the direction of said substantially centrally located plane, said portions of said tensile member embedded into said body portion comprising prongs integral with and at substantially right angles to said sheetlike tensile member and extending from the periphery of holes in said tensile member and the total area of said prongs is at least about 2% of the total area of said tensile member, substantially each of said holes are positioned in a row, along with other holes, parallel to the length of said unit and in another row at right angles to said length, all rows are positioned in a right angularly disposed reticulated cross hatch relationship, whereby the holes at the intersection of any pair of adjacent and parallel rows of holes lengthwise and crosswise of said tensile member are in a boxlike configuration, and continuous strips of nonperforated portions of said sheetlike tensile member extending between the said rows of said holes parallel and at right angles to said length.

Claim 3

The load-bearing structural unit claimed in Claim 1 in which said tensile member comprises sheet metal.

Claim 4

The load-bearing structural unit claimed in Claim 1 in which at least one of the terminating elongated edge portions of said tensile member is angularly disposed with respect to a face of said unit.

Claim 5

The load-bearing structural unit claimed in Claim 1, comprising a protective layer of a cementitious material positioned between said tensile member and the adjacent exposed surface of said unit, said exposed layer comprising a sheetlike membrane and a bond between said cementitious material and said sheetlike membrane.

Claim 6

The load-bearing structural unit claimed in Claim 1 in which said hardened cementitious body portion is a gypsum board and said tensile member is a sheet metal extending over a surface of said gypsum board.

Claim 7

A construction system comprising a load-bearing structural unit comprising a hardened cementitious body portion of high compressional strength and a substantially continuous sheetlike tensile member integral with and contiguous to said body portion extending substantially over the entire area of said body portion and disposed at a substantial distance beyond a substantially centrally located plane of said unit and a structural stress resistant bonding joint between said tensile member and said body portion, said bonding joint comprising a plurality of closely spaced portions of said tensile member embedded and extended into said body portion in the direction of said substantially centrally located plane, said portions of said tensile member embedded into said body portion comprising prongs integral with and at substantially right angles to said sheetlike tensile member and extending from the periphery of holes in said tensile member and the total area of said prongs is at least about 2% of the total area of said tensile member, substantially each of said holes are positioned in a row, along with other holes, parallel to the length of said unit and in another row at right angles to said length, all rows are positioned in a right angularly disposed reticulated cross hatch relationship, whereby the holes at the intersection of any pair of adjacent and parallel rows of holes lengthwise and crosswise of said tensile member are in a boxlike configeration, and continuous strips of nonperforated portions of said sheetlike tensile member extending between the said rows of said holes parallel and at right angles to said length and the shank portion of a fastener extending first through said cementitious body portion and engaging said tensile member.

Claim 8

A construction system comprising a load-bearing structural unit comprising a hardened cementitious body portion of high compressional strength and a substantially continuous sheetlike tensile member integral with and contiguous to said body portion extending substantially over the entire area of said body portion and disposed at a substantial distance beyond a substantially centrally located plane of said unit and a structural stress resistant bonding joint between said tensile member and said body portion, said bonding joint comprising a plurality of closely spaced portions of said tensile member embedded and extended into said body portion in the direction of said substantially centrally located plane, said portions of said tensile member embedded into said body portion comprising prongs integral with and at substantially right angles to said sheetlike tensile member and extending from the periphery of holes in said tensile member and the total area of said prongs is at least about 2% of the total area of said tensile member, substantially each of said holes are positioned in a row, along with other holes, parallel to the length of said unit and in another row at right angles to said length, all rows are positioned in a right angularly disposed reticulated cross hatch relationship, whereby the holes at the intersection of any pair of adjacent and parallel rows of holes lengthwise and crosswise of said tensile member are in a boxlike configeration, and continuous strips of nonperforated portions of said sheetlike tensile member extending between the said rows of said holes parallel and at right angles to said length and the shank portion of a fastener extending first through said cementitious body portion and engaging said tensile member.

Claim 9

The construction system claimed in Claim 6 in which said tensile member comprises a sheet metal and said shank portion engages one of said holes and at least one dimension of said hole is less than that of the diameter of said shank portion prior to the insertion of said shank.

Claim 10

A load-bearing structural unit comprising a hardened cementitious body portion of high compressional strength and a substantially continuous sheetlike tensile member integral with and contiguous to said body portion extending substantially over the entire area of said body portion and disposed at a substantial distance beyond a substantially centrally located plane of said unit and a structural stress resistant bonding joint between said tensile member and said body portion, said bonding joint comprising a plurality of closely spaced portions of said tensile member embedded and extended into said body portion in the direction of said substantially centrally located plane, said portions of said tensile member embedded into said body portion comprising prongs integral with and at substantially right angles to said sheetlike tensile member and extending from the periphery of holes in said tensile member; the total area of the prongs extending around the periphery of a hole is the same as the total area of the hole; the total area of said prongs is at least about 2% of the total area of the tensile member and substantially each of said holes are position in a row, along with other holes, parallel to the length of said unit and in another row at right angles to said length, all rows are positioned in a right angularly disposed reticulated cross hatch relationship, Whereby the holes at the intersection of any pair of adjacet and parallel rows of holes lengthwise and crosswise of said tensile member are in a boxlike configuration, and continuous strips of nonperforated portions of said sheetlike tensile member extending between the said rows of holes parallel and at right angles to said length.

Claim 11

A load-bearing structural unit comprising a hardened cementitious body portion of high compressional strength and a substantially continuous sheetlike tensile member integral with and contiguous to said body portion extending substantially over the entire area of said body portion and disposed at a substantial distance beyond a substantially centrally located plane of said unit and a structural stress resistant bonding joint between said tensile member and said body portion, said bonding joint comprising a plurality of closely spaced portions of said tensile member embedded and extended into said body portion in the direction of said substantially centrally located plane, said portions of said tensile member embedded into said body portion comprising prongs integral with and at substantially right angles to said sheetlike tensile member and extending from the periphery of holes in said tensile member; the total area of the prongs extending around the periphery of a hole is the same as the total area of the hole; the total area of said prongs is at least about 2% of the total area of the tensile member and substantially each of said holes are position in a row, along with other holes, parallel to the length of said unit and in another row at right angles to said length, all rows are positioned in a right angularly disposed reticulated cross hatch relationship, Whereby the holes at the intersection of any pair of adjacet and parallel rows of holes lengthwise and crosswise of said tensile member are in a boxlike configuration, and continuous strips of nonperforated portions of said sheetlike tensile member extending between the said rows of holes parallel and at right angles to said length.

Claim 12

The load-bearing structural unit claimed in Claim 8 in which said hardened cementitious body portion is a gypsum-type board and said tensile member is a sheet metal extending over a surface of said gypsum-type board.