| 摘要 |
In a free-standing staircase, the separate steps (1) are each composed of two parts (2,3) with swing adjustment round a vertical axis. Their facing sides, in relation to the axis, have a height displacement, with passage openings (9) at the connecting surfaces (7,8) for the following steps (1). A lost shell, with a common hollow zone, has an upper filling opening (11) for filling with concrete, with an opening cover (13). |
