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. 21, 1984
Filed:
Jun. 10, 1980
Applicant:
Inventor:
Michael A Richardson, Hindhead, GB;
Assignee:
Marcon International Limited, Saint Peter Port, GB;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21D / ; E21D / ; E21D / ;
U.S. Cl.
CPC ...
405143 ; 405146 ; 405150 ;
Abstract
A tunnel or shaft lining is installed nondisruptively in a medium such as soil by longitudinally advancing an assembly (10) of tunnel lining sections (12-1 to 12-8) arranged in end-to-end relationship and having an inflatable torus (22- 1 to 22-7) interposed between adjacent sections. Worm-like advancement is effected by simultaneously inflating in sequence the tori 22-1, 22-4, 22-7 etc.; the tori 22-2, 22-5 etc. and the tori 22-3, 22-6 etc., and repeating the inflation procedure as necessary until sufficient advance has been achieved.