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:
Mar. 20, 1979
Filed:
Jul. 14, 1977
Nobuyuki Abe, Matsudo, JP;
Osamu Watanabe, Iwatsuki, JP;
Masami Tominaga, Tokyo, JP;
Koji Nunokawa, Kamakura, JP;
Ichiro Tanaka, Kamakura, JP;
Masao Manabe, Kawasaki, JP;
Nippon Concrete Industries Co., Ltd., Tokyo, JP;
Abstract
This invention relates to a method of setting a pile without causing any noise or vibration. A hollow pile is erected along a leader fixed on the ground, a screw auger is inserted through the hollow center of the pile, the screw auger is hung on the leader in such a manner that it can freely move up and down and freely rotate, and the pile is sunk by its own weight as the soil below the bottom of the pile is excavated and the excavated soil is carried above the ground. The present invention further relates to an apparatus for executing the above method. The lower part of the screw auger is constructed in such a manner that it is divided into two parts, inner tube and outer tube, and both tubes can rotate through a certain angle and move up and down in a certain range relatively to each other. Excavating nozzles are disposed at the lower part of the screw auger in such a manner that they can be unfolded at several stages by the relative rotation and the vertical movement of the fluid is directed laterally from the nozzles to enlarge the hole below the pile.