METHOD FOR CONSTRUCTION OF INJECTION PILE Russian patent published in 2015 - IPC E02D5/34 

FIELD: construction.

SUBSTANCE: method for construction of injection pile, in accordance with which the well construction is carried out without removing the soil by forcing the perforated injection pipe with conical tip fixed below into the soil, consisting of disk, the diameter of which exceeds the diameter of injection pipe and cutting plates. Hardening solution is injected under pressure into the injection pipe by filling the constructed well, the wellhead is plugged up, and upon the achievement of the conical tip of design mark and at the end of injection, the injection pipe with conical tip is left in the well. Injection pipe with perforated bottom part is impressed into the soil, injection of solidifying solution is carried out simultaneously with impression of injection pipe, besides gradually from top to bottom as the perforated bottom part of injection pipe is immersed when pressing in. The wellhead is plugged up prior to injecting the hardening solution immediately after impression of conical tip of injection pipe into the soil. In the first stage protection against outflow outside of injected hardening solution is provided additionally, for example, via the case put on the perforated portion of injection pipe and mounted above the plugging device, and after immersion in the first stage of perforated part of injection pipe into the soil and filling of well with hardening solution to height of perforation zone, extension of the obtained pile shaft is carried out additionally via the additional injection under pressure of hardening solution. Then, the injection pipe is impressed again to height of perforation zone with simultaneous injection of solidifying solution and subsequent additional expansion of the obtained pile shaft. Then, operations on forming the pile shaft at each subsequent immersion stage of injection pipe to the height of perforation zone is repeated again in the same sequence until the achievement of conical tip of design mark.

EFFECT: ensuring the formation of solid section of pile shaft, increasing the load-bearing capacity and production effectiveness in soft soils.

6 cl, 12 dwg