Hitachi Zosen Corporation

Kyouichi Nakayasu

Toshiaki Morii

Masaki Inui

Yoshito Yamakawa

Yuuichirou Kimura

Ryouta Yoshiki

Yuuichiro Kimura

Hiroaki Arai

Hideyuki Niizato

Koji Kitamura

Jun Okada

Satoshi Ashida

Toru Itagaki

To make it possible to raise a door body even if it is damaged by an impact of vehicle traffic or falling objects when it is in a lowered state, and to keep the door body in a raised state even if it is damaged by a water pressure of a tsunami or a high tide when it is in a raised state. A door bodyof a floating flap gateis disposed at an opening or at an access way. When water flows in, a forward endof which swings upwards, in a direction in which the water flows in and within a plane in a height direction, around a base endthereof which serves as a center of rotation, to block the opening or the access way. The door bodyis formed from a hard polyurethane foamin the form of a sheet.

Door structure for floating flap gate

An apparatus for shutting off the flow of water through ductwork is disclosed that is installed in an air conditioning duct in a building and closes the air conditioning duct in the event of the attack of seawater. Two upper and lower hinged door bodies disposed in the inside of the air conditioning duct are supported by a support device in the state in which the inside of the air conditioning duct is open. The opening and closing operations of the upper door body are interlocked with the opening and closing operations of the lower door body by a chain. A water intrusion detection device releases the supporting of the two upper and lower door bodies in the event of the intrusion of water. The two upper and lower door bodies are horizontally moved in the direction of water pressure when the inside of the air conditioning duct is closed.

Apparatus for shutting off flow of water through ductwork

A floating flap gate to prevent water from overflowing into underground spaces, with ease in raising or lowering the door body when water level changes. The floating flap gate comprises a door body with a forward end which swings upwards or downwards in a same direction following a rise or a drop in water level, wherein an opposite end serves as a fulcrum. A rod is attached to the forward end of the door body. One end of a wire rope is attached to the rod, and the other end is attached to a counterweight via fixed pulleys. The fixed pulleys are arranged so that the counterweight is at its lowest point when the angle of inclination of the door body with respect to a horizontal plane reaches within a range from 10&#xb0; to 80&#xb0; during raising or lowering of the door body.

Floating flap gate

The present invention utilizes a vertically upward force of a water when a tsunami smashes into a building to close openings that exist in an elevated location such as air supply and exhaust ducts, powerlessly and without a manual operation. The present invention serves as a disaster prevention panel which closes an openingdisposed in a wall of a building. A door bumperis disposed on an outer peripheral wall of the opening, and side door bumpersare disposed on both sides of the door bumper. A door body, which closes the openingand which has a specific gravity lower than a seawater, is attached between the side door bumperson both sides so as to freely swing upwards, with a lower portion of the door bumperserving as a fulcrum.

Flap gate-type waterproof panel for wall installation

A land-mounted flap gate formed by arranging and connecting a plurality of door bodies alongside one another is disclosed. The front side of each of the plurality of door bodies is raised and lowered using the back end side of each door body as a support point. One end of a rope is attached to the back end surface of the door body and the other end of the rope is attached to a counter weight. At least one fixed pulley for guiding the rope is disposed below the back end side of the door body such that the counter weight assists the raising or lowering when starting the raising or lowering and acts as a resistance against the raising or lowering before completing the raising or lowering. The waterproof film that seals a space between neighboring door bodies in a waterproof manner is formed in a substantially trapezoidal shape.

Land-mounted flap gate

The present invention provides a floating flap gap which has a door body with a forward end which is able to swing upwards, in a direction in which the water flows into an opening or at an access way, around a base end thereof serving as a fulcrum. The door body is attached to one end of a wire rope, and an auxiliary force generating means is attached to the other end thereof. This structure makes it possible to prevent an overflow during the initial influx of water and to enhance the ability of the door body to follow the water level when the door body begins to lower. This structure additionally makes it possible to mitigate a shock which occurs when raising of the door body is completed and when lowering of the door body is completed.

Growing community of inventors

Osaka, Japan

Kyouichi Nakayasu