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:
Feb. 11, 1986
Filed:
Dec. 02, 1983
Applicant:
Inventors:
Yoshiyuki Takahashi, Tokyo, JP;
Fumihiro Koiso, Tokyo, JP;
Assignee:
Mitsui Kensetsu Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21D / ;
U.S. Cl.
CPC ...
405150 ; 405138 ; 405141 ; 405146 ;
Abstract
A driving process for enlarging a tunnel wherein a primary shield machine is driven along an ordinary diametrical tunnel to a predetermined region to be enlarged. An enlarged starting base is formed in the rear of the primary shield machine. An enlarging shield machine is assembled in the enlarged base. Thereafter, the primary shield machine and the enlarging shield machine are both driven forward along the predetermined region of enlargement to construct an enlarged tunnel.