Hitachi Zosen Corporation

Yoshito Yamakawa

Toshiaki Morii

Kyouichi Nakayasu

Masaki Inui

Kyoichi Nakayasu

Yuichiro Kimura

Kunie Miyamoto

Yuuichirou Kimura

Hiroaki Arai

Koji Kitamura

Hideyuki Niizato

Jun Okada

Satoshi Ashida

A flood prevention device includes a gate device constituting a passage between a flood prevention area and an outside area, and a portable flood prevention material that separates the flood prevention area and the outside area with the gate device. The gate device has a side wall corresponding to one end of the portable flood prevention material.

Flood prevention device

An axis positioning mechanism serving as a rotation bearing of a flap gate includes a housing disposed at the bottom of an opening, a first rotating plate rotationally supported by the housing via a first shaft, a second rotating plate rotationally supported by the housing via a second shaft having a different axis from the first shaft, and a synchronizing rod rotationally connected to the rotating plates so as to synchronize the rotations of the rotating plates. The axis positioning mechanism further includes connecting members rotationally connecting a door base and the rotating plates with different axes. The door is laid flat with a pivot at a higher position than the axes.

Rotation bearing of flap gate and flap gate

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

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.

Growing community of inventors

Osaka, Japan

Yoshito Yamakawa