| 摘要 |
<p>Elements made of concrete form a set, erected close together to support terraces, paved areas or similar. They (1) form pillars, with cross-sectional shaped formed by two trapeziums (1',1") with base lines (3) united. Base lines of the two may be of different length, lengths pref. being 5 or 3 times a grid dimension (a), while heights are 4 times this dimension. Side lines (4) may be sloped. Elements may be divided in the plane of the two trapeziums base lines, or halved in the longitudinal centre plane. Such elements can be set up close together without gaps, and with no need for mortar or sand filling.</p> |
