Abstract: The present invention relates generally to a steel reinforcing structure 10 for concrete according to one embodiment of the invention. The steel reinforcing structure is in the form of a cage 10 comprising six (6) reinforcing bars arranged substantially parallel to one another including a pair of common reinforcing bars 12A and 126 located intermediate two (2) pairs of opposing reinforcing bars 14A/B and 16A/B. The reinforcing cage 10 also comprises a plurality of spiral ties including one pair of spiral ties 18A and 18B located on one side of the reinforcing cage 10, and another pair of spiral ties 20A and 20B located on an opposite side of the reinforcing cage 10. The pair of spiral ties 18A/18B on the left hand side of the reinforcing cage 10 are formed in a clockwise direction whereas the other pair of spiral ties 20A/20B on the right hand side of the reinforcing cage 10 are formed in an anticlockwise direction forming a set of the spiral ties.

Abstract: A SprialNet device is disclosed. The device is consisted by its number of spiraled bends according to request geometric shape of a concrete column, where FIG. 1 shows a SpiralNet for a rectangular shape frame of a concrete column. The spiraled bends are starting from point 1 to point 2 with 135 degrees, and continuously followed by 90 degree spiraled bends from point 2 to point 3 along a side of a concrete column, and from point 3 to point 4 along an adjacent side of the same column, and from point 4 to point 5 the next adjacent side of the same column, and from point 5 to point 6 the continuous adjacent side of the same column, and then finished with the last 135 degree spiraled bend from point 6 and to point 7. The measurement of bends are according to any section view which is perpendicular to all edges. The device can be used to construct any shape of concrete column by assembling SpiralNet in a unique order.