Method for forming an underground wall comprising a plurality of columns in the earth and soil formation

Claim 1

A method for the formation of an underground wall comprising a plurality of successive columns in the earth and soil formation comprising the steps of driving a vertically and rotationally movable hollow shaft having drill means at the lower end and nozzle means in the periphery wall thereof by means of a boring machine into said earth and soil formation in a first area as the shaft rotates to a predetermined depth in the formation to form a cavity therein, after said cavity of said predetermined depth has been formed, withdrawing said shaft from said cavity and simultaneously pumping an earth and soil solidification and densification agent under high pressure through said nozzle means radially from the shaft into said cavity continuously throughout the length of said cavity to destroy the formation area surrounding the cavity so as to form an earth and soil formation solidification column which has a diameter continuously larger than the cavity throughout the length of said cavity; moving said movable hollow shaft to successive areas adjacent to said previously formed column; and at each adjacent area driving said vertically and rotationally movable hollow shaft having said drill means at the lower end and said nozzle means in the periphery wall thereof by means of said boring machine into said earth and soil formation as the shaft rotates to a predetermined depth in the formation to form an adjacent cavity therein, after said adjacent cavity of said predetermined depth has been formed, withdrawing said shaft from said adjacent cavity and simultaneously pumping an earth and soil solidification and densification agent under high pressure through said nozzle means radially from the shaft into said adjacent cavity continuously throughout the length of said cavity to destroy the formation area surrounding said adjacent cavity so as to form an earth and soil formation solidification column which has a diameter continuously larger than the cavity throughout the length of said adjacent cavity, said adjacent areas being selected such that a portion of the periphery of the previously formed column at the first area is destroyed by the liquid agent pumped in at said successive areas whereby the adjacent columns are continuously connected to each other throughout the length of said columns in the opposite peripheral sections of the adjacent columns.

Claim 2

A method for the formation of an underground wall comprising a plurality of successive columns in the earth and soil formation comprising the steps of driving a vertically and rotationally movable hollow shaft having drill means at the lower end and nozzle means in the periphery wall thereof by means of a boring machine into said earth and soil formation in a first area as the shaft rotates to a predetermined depth in the formation to form a cavity therein, after said cavity of said predetermined depth has been formed, withdrawing said shaft from said cavity and simultaneously pumping an earth and soil solidification and densification agent under high pressure through said nozzle means radially from the shaft into said cavity continuously throughout the length of said cavity to destroy the formation area surrounding the cavity so as to form an earth and soil formation solidification column which has a diameter continuously larger than the cavity throughout the length of said cavity; moving said movable hollow shaft to successive areas adjacent to said previously formed column; and at each adjacent area driving said vertically and rotationally movable hollow shaft having said drill means at the lower end and said nozzle means in the periphery wall thereof by means of said boring machine into said earth and soil formation as the shaft rotates to a predetermined depth in the formation to form an adjacent cavity therein, after said adjacent cavity of said predetermined depth has been formed, withdrawing said shaft from said adjacent cavity and simultaneously pumping an earth and soil solidification and densification agent under high pressure through said nozzle means radially from the shaft into said adjacent cavity continuously throughout the length of said cavity to destroy the formation area surrounding said adjacent cavity so as to form an earth and soil formation solidification column which has a diameter continuously larger than the cavity throughout the length of said adjacent cavity, said adjacent areas being selected such that a portion of the periphery of the previously formed column at the first area is destroyed by the liquid agent pumped in at said successive areas whereby the adjacent columns are continuously connected to each other throughout the length of said columns in the opposite peripheral sections of the adjacent columns.