| 摘要 |
<p>A self raising flood barrier comprising a gate 100 for preventing the passage of a liquid from one area to an adjacent area. The gate 100 is provided between the two areas so that the gate normally rests at a grade level above a buoyant gate operating member 300. The gate and the gate operating member may be hinged inside a housing 200 so that on rotation they move away from each other. When the liquid enters the housing, a hydrostatic pressure develops on both the gate and on the gate operating member, with the member urging the gate to rotate upwardly so that the gate turns to the upright position automatically before the liquid level reaches the grade level. The barrier may have the option of returning automatically to its normal position flat with grade or locking automatically in upright position.</p> |
