| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a precast concrete staircase unit improved in sit working efficiency by reducing the overall weight thereof and having a sufficient strength and also provide a staircase structure using the staircase unit. <P>SOLUTION: This precast concrete staircase unit comprises: tread parts 1 forming a staircase main body; flat parts 4a, 4b arranged continuously with both upper and lower ends of the tread part 1; and girder parts 5 longitudinally joined to each other on both sides of the tread parts 1 and the flat parts 4a, 4b. The staircase unit is formed in a precast concrete integral molded product in which various reinforcements 6 are arranged in the tread parts 1, the flat parts 4a, 4b, and the girder parts 5, or formed in a steel frame plate 9 in which only the girder parts 5 are joined to the various reinforcements 6 of the tread parts 1 and the flat parts 4a, 4b. A lateral girder part 8 is installed at the ends of the flat parts, and placed on the upper surface of a small beam part 15 formed at a building structure. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
