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:
Apr. 14, 1992
Filed:
Apr. 16, 1990
Davide Trevisani, Cesena, IT;
Trevi S.p.A., Cesena, IT;
Abstract
The method for boring a tunnel consists in placing an excavation tool at a point of the extrados of the tunnel and in excavating a cavity by imparting the tool an advancement movement having divergent direction with respect to the axis of the tunnel. While the cavity is being filled with concrete, a further cavity is excavated in another point of the extrados and is then also filled with concrete. These operations are repeated until a plurality of voussoirs is obtained which are arranged adjacent to one another along the extrados and give rise to a frustum-shaped vault. The soil inside the vault is then excavated for a depth which is smaller than the axial extension of the vault itself, and a subsequent vault is formed having a narrower initial portion internal to the wider terminal portion of the previously executed vault.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile