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:
May. 18, 1993
Filed:
Apr. 03, 1992
Ayao Siseki, Tokyo, JP;
Koji Tada, Tokyo, JP;
Toru Taniguchi, Tokyo, JP;
Masahiro Nakagawa, Tokyo, JP;
Yuji Tachikawa, Tokyo, JP;
Makoto Ukegawa, Tokyo, JP;
Toda Corporation, Tokyo, JP;
Mitsui Engineering & Shipbuilding Co. Ltd., Tokyo, JP;
Abstract
Disclosed is a method of making a huge elongated space of square or rectangular cross section under the ground. The outer shell of the huge elongated space is built in the form of integral arrangement of lateral shell-units having shielded passages therein. Such a huge underground space can be made without requiring any large-scale equipments on the ground. The huge outer shell can be made with accuracy and efficiency by skiving and jointing adjacent parallel lateral shell-units and by using selected lateral passage of shell-units to discharge the soil or mud removed in making the underground space.