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. 03, 1979
Filed:
Feb. 01, 1978
Toshiya Ogasawara, Ohdate, JP;
Norimasa Kubo, Ohdate, JP;
Hiroshi Nagino, Okayama, JP;
Mamoru Takeda, Okayama, JP;
Masanori Ochiishi, Okayama, JP;
Dowa Mining Co., Ltd., Tokyo, JP;
Dowa Engineering Co., Ltd., Okayama, JP;
Abstract
A rectangularly shaped tunnel is constructed to include an artificial roof, side wall pillars, a center wall pillar and floor portions all extending along the length of tunnel. The artificial roof is formed by sequentially excavating cross cut shafts and by subsequently plugging the thus formed cavities with concrete. Then the portions directly beneath opposite sides and the center of the roof are excavated and filled with concrete to form side wall pillars and a center wall pillar. Thereafter the rock portions covered by the roof and the wall pillars are excavated to form inner hollow tunnel chambers, the bottoms of which are covered by concrete to form floor portions. Iron frames are embedded in the concrete.