| 摘要 |
PURPOSE:To provide external stairs which are stabilized in structure, and improved in executing ability and design. CONSTITUTION:Steel frame columns 1 are erectedly fixed to a building frame at the same width as a stair, and a small beam 2 is erected at a position coinciding with the building frame of uper and lower floors between the columns 1, and a lateral Y-shaped external beam 3 composed of horizontal paces 3b, 5b and upper and lower stair beams 3a, 5a, and a middle beam 5 are arrangedly provided on the small beam 2 and the steel frame columns 1. A tie beam 4 is tied to the tip of the pace beam of each lateral Y-shaped beam, and a precast concrete stair material 20 formed by unitedly molding a rise 20b and a tread 20a is provided between the lateral Y-shaped beams 3, 5. |
