Steel form

Abstract

A steel form is a steel form for forming a binding beam, including: a pair of Z-steels, wherein each of the pair of Z-steels is provided with a bottom plate portion and a side plate portion extending upward from the bottom plate portion, the bottom plate portion has a joining surface for joining the respective bottom plate portions of the pair of Z-steels to each other, and a groove portion allowing concrete placement is formed by the bottom plate portion and the side plate portion of each of the pair of Z-steels

1 . A steel form for steel-framed concrete beam formation, comprising:
 a pair of frame members, wherein   each of the pair of frame members is provided with a bottom plate portion and a side plate portion extending upward from the bottom plate portion,   the bottom plate portion has a joining surface for joining the respective bottom plate portions of the pair of frame members to each other, and   a groove portion allowing concrete placement is formed by the respective bottom and side plate portions of the pair of frame members.   
     
     
         2 . The steel form according to  claim 1 , wherein an allowable bending moment or an allowable shear force of the steel-framed concrete beam is calculated by Equation (1) below:
     F   a   =F   RC   +β·F   S    (Equation 1)
   wherein,   F a : an allowable bending moment or an allowable shear force of the steel-framed concrete beam,   F RC : an allowable bending moment or an allowable shear force of the concrete,   β: a burden factor of an allowable bending moment or an allowable shear force of the steel form, which is 0.5 or less, and   F S : an allowable bending moment or an allowable shear force of the steel form.   
     
     
         3 . The steel form according to  claim 1 , wherein
 a part of the steel-framed concrete beam is joined to a girder, and   the steel form is provided with an end portion on the girder side in a longitudinal direction of the steel form, accommodated in the girder via, a notch formed in a side surface of the girder, and having a length equal to or greater than a cover thickness of the girder.   
     
     
         4 . The steel form according to  claim 1 , wherein a non-opening member for fixing the pair of side plate portions to each other is provided in a range from an upper end position of the pair of side plate portions to a position below the upper end position by one-third of a height of the pair of side plate portions. 
     
     
         5 . The steel form according to  claim 1 , wherein the steel form is provided with a flange portion extending outward from an upper end of the side plate portion. 
     
     
         6 . The steel form according to  claim 5 , wherein the steel form is provided with a reinforcing portion extending downward or upward from an outer end of the flange portion.