| 摘要 |
A demountable barrier (8) for substantially preventing access of water into premises (2) through an access region (4) provided in a wall (6) of the premises. A frame member (10) has a longitudinal channel (20) in a first face (22) open towards the wall of the premises. A resilient membrane (30) is secured to the frame member and framed by the frame member and overlying and closing the longitudinal channel. A non-return air valve (28) extends to the longitudinal channel from a second face (24) of the frame member and is sealed through an aperture provided in the frame member. A compressible sealing member (38) is located between the frame member and the wall of the premises and pump means (40) provides pressurised air into the longitudinal channel through the non-return air valve, to effect ballooning of the resilient membrane overlying the longitudinal channel and compression of the compressible sealing member, whereby a substantially water-tight seal is effected between the frame member and the wall.
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