Bridgestone Corporation

Mamoru Takasaki

Yoshihiro Sato

Tateo Muramatsu

Yasushi Enami

Satoshi Tagomori

Masao Fujisawa

Hideaki Saito

A method of manufacturing a rubber weir main body, which manufactures a rubber weir main body intended to rise by the flow-in of a fluid and to fall by the discharge of the fluid by integrally bonding at least two main body segments divided in the circumferential direction to each other, including the steps of: forming a material removed portion with stepped portions at edges of the rubber weir main body segments previously manufactured; abutting the rubber weir main body segments on each other at the edges; laminating unvulcanized rubber sheets containing reinforcing canvasses and an unvulcanized rubber sheet on the material removed portion formed between both the rubber weir main body segments contacted with each other; and integrally vulcanizing and bonding them. With this method, a large sized rubber weir main body excellent in quality can be easily manufactured at a job site.

Method of manufacturing rubber weir main body

A collapsible sheet dam comprises a bag of flexible rubber sheet fixed onto a riverbed and riverbank portions of a river, and a fluid supply and discharge port formed in the bag. In such a dam, an end portion of the bag is fixed onto the riverbed and riverbank portions at upstream side and at the same time a portion of the bag located behind the fluid supply and discharge port is fixed onto the riverbank portion and a region ranging from the riverbank portion to the riverbed portion around the fluid supply and discharge port.

Collapsible sheet dam

A damage-protecting flexible rubber sheet dam uses a wear-resistant, cut-resistant member having a corrosion resistance embedded in at least a part of an outer surface portion of a rubber dam body. The member mitigates and prevents damage of the outer surface portion due to wear and other various external injuries to prolong the durable life thereof.

Damage-protecting flexible sheet dam

A flexible sheet dam is secured to the riverbed along two securing lines at upstream and downstream sides. In this dam, at least one concave and/or convex region is made in the plane of the riverbed between the two securing lines in a direction parallel to the securing lines, whereby the complete deflation of the dam can be attained without trouble.

Growing community of inventors

Tokyo, Japan

Mamoru Takasaki