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. 09, 1991
Filed:
Jan. 29, 1990
Hiroshi Yoshida, Tokorozawa, JP;
Mitsuhiro Shibazaki, Tokyo, JP;
Hiroaki Kubo, Nakamuraminami, JP;
Shunji Jinbo, Koyama, JP;
Kajima Corporation, Tokyo, JP;
Chemical Grouting Company, Ltd., Tokyo, JP;
Abstract
The present invention relates to a method of improving the ground of a large section area. A double pipe, having a first nozzle directed in the lateral direction and a second nozzle surrounding the first nozzle, is inserted into a hole dug in the ground. A ground improving agent is injected at high pressure from the first nozzle through one pipe of the double pipe. A reproduced slurry, obtained by reproducing grouted slimes, is injected from the second nozzle through the other pipe of the double pipe at a lower pressure than the pressure of the ground improving agent. While rotating, the double pipe is lifted up from under ground. The ground improving agent, injected at the high pressure, is surrounded by the reproduced slurry injected at the lower pressure. The frictional resistance between the ground improving agent and the sediments is reduced, the arrival distance of the ground improving agent is increased, and the abrasive effect is obtained. Instead of surrounding the first nozzle, the second nozzle can be arranged at a position closer to the first nozzle. Further, a triple pipe, having the first and second nozzles and a third nozzle surrounding the first and second nozzles, can be inserted into the hole dug in the ground. The ground improving agent is injected at high pressure from the first nozzle through a first pipe in the triple pipe. The reproduced slurry, obtained by reproducing the grouted slimes, is injected from the second nozzle through a second pipe in the triple pipe at a lower pressure than the pressure of the ground improving agent. A gas is blown out from the third nozzle through a third pipe in the triple pipe. While rotating, the triple pipe is lifted up from under the ground. Both the ground improving agent injected at the high pressure and the reproduced slurry injected at the lower pressure are surrounded by the gas. This method results in reproduction of the grouted slimes, assurance of the necessary injection amount of the grouting ground improving agent, and suitabloe jet stream dynamic pressure distribution.