W. R. Grace Co.-conn.

Keiichi Kosuge

Sachio Shimizu

A tunnel waterproofing method comprises spraying a primary coating of concrete onto the excavation surface of a tunnel, installing thereon a waterproofing sheet having an adhesive layer operative to bond with concrete, and spraying a secondary coating of concrete against the adhesive side of the waterproofing sheet. Preferably, a buffer water conducting sheet is established between the primary concrete coating sprayed onto the excavation surface and the waterproofing sheet.

Tunnel waterproofing method

A tunnel waterproofing construction method that avoids dripping and fogging during spray application, organic solvents, unpleasant odors, and cracking, while providing workability, superior tunnel waterproofing characteristics, and economic advantage. A primary spray cement concrete is sprayed onto the excavated tunnel surface, and an ambient-temperature vulcanization-type rubber emulsion is sprayed onto the primary concrete, thereby forming a rubber film, and a secondary concrete coating is then established on the rubber surface. The primary spray cement concrete may be used to even out the irregular earthen excavation surface, and a drainage layer may be used along with the primary spray cement concrete surface.

Growing community of inventors

Machido, Japan

Keiichi Kosuge