Method for improving ground

Abstract

A method for improving ground is capable of preventing a clod whose representative size is large from remaining in the ground. The method for improving ground includes cutting a ground by injecting a cutting fluid (e.g. high-pressure water or high-pressure air: including a case where a solidification material is injected) from jet devices, feeding a solidification material, mixing the cut ground, the cutting fluid and the solidification material, and agitating a mixture thereof to form an underground consolidated body. A plurality of nozzles are located at an interval in a vertical direction in the jet devices, and when the cutting fluid is injected, a cutting fluid is injected from an upward nozzle in a downward skewed direction, and a cutting fluid is injected from a downward nozzle in an upward skewed direction.

1 . A method for improving ground comprising the steps of: cutting a ground by injecting a cutting fluid from jet devices; feeding a solidification material; mixing a cut ground, the cutting fluid and the solidification material; and agitating a mixture thereof to form an underground consolidated body, wherein
 a plurality of nozzles are located at an interval in a vertical direction in the jet devices, and when the cutting fluid is injected, a cutting fluid jet is injected from an upward nozzle in a downward skewed direction, and a cutting fluid jet is injected from a downward nozzle in an upward skewed direction.   
     
     
         2 . The method for improving ground according to  claim 1 , wherein the method for improving ground comprises a step of adjusting the angle of the nozzles. 
     
     
         3 . The method for improving ground according to  claim 1 , wherein the method for improving ground comprises a step of adjusting the interval between the nozzles in a vertical direction. 
     
     
         4 . The method for improving ground according to  claim 2 , wherein the method for improving ground comprises a step of adjusting the interval between the nozzles in a vertical direction.