Apparatus allowing ventilation through a ventilation shaft to an underground ventilation duct fluidly communicating through the ventilation shaft to an atmospheric opening of the shaft and on threat of flooding operable to prevent downward flow of surface water into the underground ventilation duct includes support sidewalls fitting in the shaft providing a ventilation passage between support top and bottom openings and a suspension member supported on opposed lateral sidewalls unobstructively horizontally spanning the passage proximate the top opening and holding one or more hinge connected panels in the passage that manually release to rotationally close the passage and prevent flooding and are manually rotationally liftable to a home position allowing ventilation. The suspension member is liftingly removable from the support and may include end keys received in keyed supports to allow the suspension member to fit in the supports so a specific panel closes to a specific sidewall.

A flood-protective ventilation louver includes a window frame assembly, slat assemblies, a transmission mechanism, and a buoyance switch assembly. During flooding, external water passes through the window frame assembly into the buoyance switch assembly, such that the buoyance switch assembly is caused to release the transmission mechanism from constraint to thereby allow the slat of each of the slat assemblies to oscillate downward automatically and thus automatic closing is realized.

In order to structurally simplify a frame that is a component of a door body and to reduce required levels of manufacturing precision and assembly precision, thereby reducing a manufacturing man-hour, provided is a floating flap gate 1 installed on a road surface rs at an entrance portion of a building or an underground space. An upward swinging support portion is composed of a bottom fitting 5, a resin plate 6 configured to support a door body 4 when the door body 4 is raised, a water cut-off film 13 covering the bottom fitting 5 and the resin plate 6, a first pressing plate 14, and a second pressing plate 16. The bottom fitting 5 has a convex circular arc-shaped surface 5a. The resin plate 6 has a concave circular arc-shaped surface 6a to be mated with the convex circular arc-shaped surface 5a of the bottom fitting 5.

An inflatable flood barrier includes a board having a side plate and a peripheral plate attached to the side plate. The board being provided with a charging port, the peripheral plate has rounded corners, and the side plate has corner portions. The rounded corners and the corner portions are positionally corresponding. The corner portion has guiding grooves. A flexible seal embraces at least a part of the peripheral plate and has an internal channel, a gas inlet and a gas discharging port. When the flexible seal is inflated at the internal channel, a watertight combination between the inflatable flood barrier and a contacting surface of a gate it protects is achieved. The inflatable flood barrier is structurally simple, watertight, convenient to use and store, apparently pleasing, and functionally versatile.

A flood-protective ventilation louver includes a window frame assembly, slat assemblies, a transmission mechanism, and a buoyance switch assembly. During flooding, external water passes through the window frame assembly into the buoyance switch assembly, such that the buoyance switch assembly is caused to release the transmission mechanism from constraint to thereby allow the slat of each of the slat assemblies to oscillate downward automatically and thus automatic closing is realized.

A hydrodynamic water blocking device for an underground garage includes a water blocking plate assembly and side rail assemblies, wherein the water blocking plate assembly includes a first water blocking element, one end of the first water blocking element is rotationally connected with a base, the other end of the first water blocking element is rotationally connected with one end of a second water blocking element, the first and second water blocking elements have foamed layers, the base has grooves capable of accommodating the embedded foamed layers, water inlets formed in the base communicate with the grooves, each of the side rail assemblies includes a side plate with an ascending rail including a horizontally disposed linear rail and an arc-shaped lifting rail, the second water blocking element has a walking assembly embedded in the ascending rail which is connected with a driving mechanism installed at the second water blocking element.

A flood barrier (100) is disclosed, which comprises at least two supporting posts (104a, 104b) for positioning at an entrance (102) of a building; and at least one panel (108) removably arranged intermediate a pair of the supporting posts to form the flood barrier, wherein the panel includes a plurality of seals having corrugated surfaces to interface with the supporting posts to provide a water-tight arrangement against entry of flood waters into the building. A method of operating said flood barrier is also disclosed.

A pedestrian door system includes a door frame comprising a frame strike side, a frame hinge side, and a frame sealing surface that extends up each of the frame strike and frame hinge sides. A threshold extends between the frame strike and frame hinge sides and includes a base secured to a floor surface and a threshold sealing surface. A door panel includes a panel bottom side, a panel strike side, a panel hinge side, and a continuous gasket extending continuously along the panel bottom side and up each of the panel strike and panel hinge sides. A door hinge couples the panel hinge side to the frame hinge side and facilitates hinged movement of the door panel between an open position and a closed position in which the gasket seals against the frame sealing surface and the threshold sealing surface in a liquid-tight manner.

A ground-anchored foundation for a mobile flood protection arrangement is provided, wherein the ground-anchored foundation comprises at least one bottom anchor cylinder, wherein the at least one cylinder is attached to a plate, the plate being centered to the at least one cylinder, wherein the plate comprises a mounting hole adapted for pivotally attaching a receiver part to the mobile flood protection arrangement.

A pedestrian door system includes a door frame comprising a frame strike side, a frame hinge side, and a frame sealing surface that extends up each of the frame strike and frame hinge sides. A threshold extends between the frame strike and frame hinge sides and includes a base secured to a floor surface and a threshold sealing surface. A door panel includes a panel bottom side, a panel strike side, a panel hinge side, and a continuous gasket extending continuously along the panel bottom side and up each of the panel strike and panel hinge sides. A door hinge couples the panel hinge side to the frame hinge side and facilitates hinged movement of the door panel between an open position and a closed position in which the gasket seals against the frame sealing surface and the threshold sealing surface in a liquid-tight manner.