The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 27, 2004
Filed:
Dec. 05, 2002
Sachio Shimizu, Tokyo, JP;
Keiichi Kosuge, Tokyo, JP;
W. R. Grace & Co.-Conn., Columbia, MD (US);
Abstract
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.