Application of Post-Grouting in Pile Foundation Construction
Post-grouting into bored cast-in-situ piles is performed through the grouting pipes previously installed at the bottom and the shaft of the cast-in-situ piles,and is pressurized by the grouting valves connected with it,to carry out high-pressure grouting at a certain time after the formation of the concrete cast-in-situ piles The post-grouting can act infiltration(coarse grain soil),splitting(fine grain soil),filling(loose soil),compaction(unsaturated loose soil)to the pile bottom sediment,pile shaft mud and soil layer at the bottom of the pile.It is a pile foundation improvement technology that strengthens the pile end sediment,pile side mud and soil layer in a certain range,improves the working interface of pile and soil,greatly improves the pile shaft friction resistance and pile end bearing capacity,thus greatly improves the ultimate bearing capacity of single pile and correspondingly reduces pile foundation settlement.
Grouting valveHigh-pressure groutingSide frictionPile toe bearing capacitySettlement
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