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:
Oct. 16, 2001
Filed:
Feb. 03, 1999
Kiyoshi Miya, Tokyo, JP;
Yoshihiro Tanaka, Tokyo, JP;
Obayashi Corporation, Osaka, JP;
Abstract
A segment,has segment units,obtained by dividing a cylindrical body having an appointed length into four sections along the circumferential direction. The segment units,are provided with a segment body,, a porous concrete layer,, water intake pores,, and clogging members,. The segment body,is constructed of a cast iron plate or steel plate and has an inwardly recessed portion on its outer circumferential surface. The concrete layer,is a porous material having water permeability, and is filled and solidified in the inwardly recessed portion,. The water intake pores,are formed on the flat bottom of two recessed portions,so as to penetrate the bottom, and are provided in a plurality along the circumferential direction with an appointed interval. The clogging members,are detachably screwed to the water intake pores,, wherein they clog the respective water intake pores,, and if the clogging members are removed, the water intake pores,are made open to the outside.