| 摘要 |
<p>Device for the injection of selected soil base layers, comprising an injection tube insertable in a bore hole, the tube having closed apertures for the injection medium, the area of these openings being covered by spring-loaded sealing sleeves, which can be opened by the force of th e injection medium itself. In the injection tube (1) at least two groups of closed apertures (2) have differing heights, and at least one valve seat body (3) is insertable in the tube (1), sealing against the inner tube wall and closable from the outside, and containing a through passage (4), for the injection medium.</p> |
