Dead water manner and the dead water feature null in the foundation pile hole for ground strengthening

摘要

PURPOSE: To effectively cut-off water to a foundation pile hole and efficiently perform construction of the foundation pile by scattering water absorptive polymer granule on the foot protective supporting layer in the neighborhood of a pile hole bottom part so as to prevent water leakage to the foot protection layer. ;CONSTITUTION: When drilling of a foundation pile hole by means of an excavation 1 is completed, fine granule of water absorptive polymer 4 mixed with foot protective liquid is injected into a supporting layer 3. The foot protective liquid 5 is injected before swelling of the polymer 4. Next while drawing up a shaft 12, a decided quantity of pile circumference fixing liquid 6 is poured in so as to enclose the foot protective liquid 5 in the pile circumference fixing liquid 6. Next, a foundation pile 32 is driven to a decided position while rotating in the pile circumference fixing liquid 6 and foot protective liquid 5 by means of a pile driver 36, and hence the foot protective liquid 5 and the pile circumference fixing liquid 6 are forced up around the foundation pile 32 by the volume of the foundation pile 32 so as to fix the pile 32.;COPYRIGHT: (C)1994,JPO