METHOD TO DETERMINE PARAMETERS OF PILLARS ERECTED IN SOIL BY METHOD OF JET GROUTING Russian patent published in 2012 - IPC E02D3/12 G01N33/24 

FIELD: construction.

SUBSTANCE: method to determine parameters of pillars erected in soil by the jet grouting method including arrangement of a well for the entire length of a pillar with subsequent erosion under permanent flow rate and pressure of a working solution and speed of lifting and rotation of a hydraulic monitor until formation of a pillar and determination of pillar parameters in compliance with soil properties. In process of well arrangement a soil sample is taken with a coring device with a case, with length multiple to pillar diameter, afterwards the case with the soil sample is installed in the horizontal position and under the right angle with one end is rigidly connected to a cylindrical conductor, the cavity diameter of which complies with the well diameter, and the other end is closed with a cover equipped with a metering system. In the conductor cavity coaxially to the cartridge with a soil sample there is a hydraulic monitor installed, and sample soil is washed with a working solution under permanent pressure, afterwards using the time of soil sample washing, the speed of hydraulic monitor lift is determined, as well as the radius of the given pillar section, and afterwards values of technological parameters are set for generation of a pillar with specified parameters.

EFFECT: simplified method, reduced costs, higher accuracy to detect geometric parameters of cement soil pillars along the entire depth of pillar erection depending on soil properties.

4 cl, 2 dwg