METHOD FOR BORED AND CAST-IN-PLACE PILE FORMING ALONG WITH GROUND COMPACTION AT HOLE BOTTOM Russian patent published in 2005 - IPC

FIELD: building, particularly pile foundation erection.

SUBSTANCE: method involves drilling hole; installing injection pipe in the hole bottom center; installing reinforcement case; injecting cement-and-sand grout through the injection pipe below lower pile end for ground compaction and widened part arrangement; concreting the pile. To create widened part of the pile and to compact ground after concrete hardening cement-and-sand grout is fed under pressure into sealed bag formed of elastic water impermeable material and connected to lower end of ejection pipe so that cement-and-sand grout expands the bag up to reaching necessary bag volume.

EFFECT: increased economy of pile forming, increased ability of clay ground compaction at pile base.

4 dwg, 1 ex