METHOD OF DRILL-INJECTION STILT FORMATION Russian patent published in 2008 - IPC E02D5/34 

FIELD: construction.

SUBSTANCE: method includes consistently following technological operations: in the beginning the pilot hole is drilled to design depth by the hollow, tight boring reciprocating screw supplied in its bottom part with a bar chisel with a slip sliding valve and inbuilt ink-jet monitors, with adjustable rotation speed of a boring reciprocating screw to 60 rpm, clockwise, then, having increased rotation speed of a boring reciprocating screw to 120 rpm by means of inbuilt ink-jet monitors, design quantity of a water cement mix is delivered by directed jets under the set high pressure not less than 6 MPa, than scour a ground and create below widening of pilot hole from a soil-cement mix due to vertical, back and forth motion of a rotating boring reciprocating screw, thus, the amplitude of back and forth motions of a boring reciprocating screw corresponds to the set design height of created widening of a pilot hole, and the total amount of a delivered water-cement mix in a hole should not be more than it one-and-a-half-fold size, then a slip sliding valve in a bar chisel is opened and, with rotating of a boring reciprocating screw counter-clockwise with a speed no more than 60 rpm, lifting of a boring reciprocating screw on height equal to a double spacing of a reciprocating screw flange is carried out, and only after that, under a reduced pressure of 0.5 MPa through a slip sliding valve the fine-grained concrete is delivered and simultaneously the back and forth motions of a boring reciprocating screw is carried out, with amplitude equal to a widening height till the moment of the beginning of the fine-grained concrete outcropping from a hole mouth, then a boring reciprocating screw is taken out without rotation and simultaneously the fine-grained concrete is delivered under the pressure of 0.15 MPa, a prefabricated reinforcement cage is set in a hole, the fine-grained concrete is moulded in a hole by the pressure not less than 0.15 MPa, thus the fine-grained concrete volume should exceed the water cement mix volume delivered to a hole not less than on 10%.

EFFECT: new method of drill-injection stilts formation.

3 cl, 4 dwg