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:
Jun. 11, 1991
Filed:
Nov. 17, 1988
Akira Miyazaki, Tokyo, JP;
Yuichi Kikuchi, Tokyo, JP;
Yoshiyuki Ohara, Tokyo, JP;
Tomosburo Fujinaga, Tokyo, JP;
Takashi Kawata, Tokyo, JP;
Fumitoshi Mizutani, Tokyo, JP;
Tsugio Hida, Omuta, JP;
Shiroyasu Shimazaki, Tokyo, JP;
Shimizu Construction Co., Ltd., Tokyo, JP;
Abstract
There are disclosed a method and a machine for constructing a shaft having a substantially circular cross-section. According to the present invention, the shaft having a shotcrete formed on a peripheral wall thereof can be easily constructed. The shotcrete can be promptly formed on the peripheral wall by spraying concrete on the wall above the water level of the water in the shaft before the wall is damaged. Also, muck excavated from a working face of the shaft can be efficiently conveyed therefrom to outside of the shaft even if the shaft has a depth of more than hundreds of meters.