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:
Sep. 21, 2004
Filed:
Dec. 05, 2002
Applicant:
Inventors:
Sachio Shimizu, Tokyo, JP;
Keiichi Kosuge, Machido, JP;
Assignee:
W. R. Grace & Co.-Conn., Columbia, MD (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21D 1/110 ;
U.S. Cl.
CPC ...
E21D 1/110 ;
Abstract
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.