METHOD FOR INJECTION PILE BUILDING (VARIANTS) Russian patent published in 2005 - IPC

FIELD: building, particularly pile foundations preferably built in weak ground, as well as industrial and civil building to erect new houses and structures and to reinforce foundation of existent ones.

SUBSTANCE: method involves driving casing pipe with removable head and injection pipe installed inside it in ground; injecting hardening grout in formed hole through injection pipe, wherein grout is initially fed in hole area defined between head and lower rest installed in casing pipe, through which injection pipe passes; lifting casing pipe with injection pipe after injection process termination; fixing casing and injection pipes; supplying hardening grout in another hole area defined between rest and preformed pile body; injection-forming pile body and repeating above operations up to casing pipe removal from ground. Injection zone is defined within the boundaries of homogenous ground. Hardening ground is supplied in each area under pressure determined for ground of each injection zone from a given relation. Additional rest is installed on injection pipe above lower rest, wherein above injection pipe part is provided with perforation. When additional support reaches ground surface casing pipe is lowered so that perforated injection pipe part is left inside the hole. After that hardening grout is injected in above hole area and casing pipe is lifted without injection pipe movement. After casing pipe removal from ground injection pipe is cut above additional rest so that perforated injection pipe part is left in formed pile body. Method of injection pile erection involves driving casing pipe with removable head and injection pipe installed inside it in ground; injecting hardening grout in formed hole through injection pipe, wherein grout is initially fed in hole area defined between head and lower rest installed in casing pipe, through which injection pipe passes; lifting casing pipe with injection pipe after injection process termination; fixing casing and injection pipes; supplying hardening grout in another hole area defined between rest and preformed pile body; injecting above pile body and repeating above operations up to casing pipe removal from ground. Injection zone is defined within the boundaries of homogenous ground. Hardening ground is supplied in each area under pressure determined for ground of each injection zone from a given relation. Additional rest is installed on injection pipe above lower rest. Arranged between the rests is reinforcing frame, which is left in pile body when additional rest reaches ground surface and after casing and injection pipes removal from hole.

EFFECT: increased strength, density and uniformity along pile height and increased load-bearing capacity.

4 cl, 10 dwg