| 摘要 |
A non- return valve can be fitted on a tubular element for use for the reinforcement and consolidation of a soil, for example, in an excavation. The non -return valve may comprise a portion made of elastomer material which has a least one nick (41,42,43,44,150) and is connected to a structural body (2,102) preferably made of metal, that can be tightened onto the tubular element (3, 103). |
