Research on the Risks and Countermeasures of Missed Inspection and Judgment in Sampling Inspection of Foundation Piles
In order to study the risks of missed inspection and judgment in the current sampling inspection process of foundation pile and propose corresponding countermeasures,analyzes the probability of missed inspection using mathematical statistics theory,analyzes the limitation and risk of missed judgment of various integrity testing methods with a large number of engineering examples,and analyzes the harm of missed inspection and judgment with engineering accident examples,and finally puts forward the improvement strategy of foundation pile testing scheme.①High-strain dynamic testing should be used for single pile vertical compressive bearing capacity and pile integrity test-ing in prestressed concrete pipe pile engineering,and the number of sampled piles should not be less than 10%of the total number of piles.When the foundation design grade is Class A,there should be no less than 20 piles,Class B,there should be no less than 15 piles,and Class C,there should be no less than 10 piles;low-strain integrity testing should also be used for pile integrity testing after soil excavation to the elevation of the design.② The cast-in-situ concrete pile should be fully embedded with acoustic pipes,and the integrity of the pile should be tested by cross-hole sonic logging.For end bearing cast-in-place concrete pile,drilling core pipes should be fully embedded,and the core drilling method should be used to detect the sediment at the bottom of the pile and the bearing layer at the pile end.
foundation pilesampling inspectionmissed inspectionmissed judgmentprobabilityfoundation pile testing scheme
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