| 摘要 |
PURPOSE:To raise the efficiency of construction work by a method in which a steel formwork is fixed to the downside of truss like fabricated reinforcing bars set between the upper and lower landings, a stepped steel formwork is fixed to the upside of the fabricated reinforcing bars, and concrete is placed through the hole of the step face of the upside formwork to form stairs. CONSTITUTION:A truss like fabricated reinforcing bars 1 consisting of an upper chord member 1a, a lower chord member 1b, and a lattice bar 1c is set between upper and lower landings. A steel formwork 2 is fixed by welding to the downside of the bars 1, a stepped steel formwork 3 is likewise fixed to the upside of the bars 1 by cast-in or split method. A concrete-placing hole 6 is formed in the step face of the formwork 3, sheathing boards are welded to both sides of the formwork 3, and concrete C is placed through the hole 6. The construction work of stairs can thus be attained with high efficiency with saved power without the needs for timbering for the formwork. |
