METHOD TO ERECT COMBINED PILE AND ITS DESIGN Russian patent published in 2013 - IPC E02D5/62 

FIELD: construction.

SUBSTANCE: method to erect a combined pile includes submersion of a prefabricated element, creation of a soil and cement element. At the first stage a pilot hole is drilled to the design elevation of soil bearing layer location depth with a drill of a drilling string with an injector and nozzles installed in it. At the second stage the drilling string is lifted with rotation and simultaneous supply of a water and cement mortar jet under pressure of at least 30 atm. with breaking of soil structure and its mixing with the cement mortar, with the capability of adjustment of geometric parameters and height of soil and cement element location. At the third stage after removal of the drilling string from the well before setting of the mortar, the prefabricated element is submerged into the arranged pilot hole, being embedded into the soil and cement element with further gain of design strength of soil and cement.

EFFECT: higher bearing capacity of a combined piled foundation, provision of larger area of prefabricated element interaction with a soil cement element, possibility to adjust cross section and height of a soil and cement element.

3 cl, 1 dwg