| 摘要 |
<p>For the levelling of the ground during the laying of tiles and paving stones and the like, use is made of a two support rails (16) for positioning in or on the under layer (18) for the support of the ends of a levelling rail (2) for the levelling of the under layer, so that the top of the rails lies on a level with the finished levelling layer. The positioning of the rails is very time consuming, particularly if the rails are to be positioned with a beforehand desired degree of slope. To solve this problem, there is provided a tool of the kind disclosed in the introduction, and which is characterised in that the levelling rail (2) consists of a straight rail with ends which are provided with slide pieces (12), the undersides (14) of which in the position of use are in contact with the upwardly-facing sides of a set of support rails (16) associated with the levelling system and having a quadratic profile with a height Sv which is preferably selected in accordance with the height of the levelling rail so that the underside (10) of the levelling rail extends flush with the underside of the supporting rails (16). The hitherto necessary burying-down of the rails is hereby avoided, in that the underside of these corresponds to the plane of the finished levelling layer.</p> |
