To objectively and accurately measure bearing strength of a pile, regardless of a measured value of a dynamic resistance component.
This bearing strength measuring method of the pile is characterized by having a collision stage of colliding a hammer 10 with the pile 20, a measuring stage of measuring a pile top end speed in the pile 20 and an inertial force correcting load of the pile 20 in the collision stage, a first graph making stage of making a first graph of indicating the relationship between the pile top end speed and the inertial force correction load of the pile 20 in the measuring stage, a yield strength extracting stage of extracting the inertial force correcting load of the pile 20 in a position being 0 in the pile top end speed as yield strength in the first graph, a second graph making stage of making a graph of indicating the relationship between a collision speed of the hammer and the yield strength by performing in a plurality of times up to the yield strength extracting stage by changing the collision speed of the hammer 10, and a bearing strength measuring stage of setting a value of the yield strength of changing the relationship between the collision speed and the yield strength as bearing strength in a second graph.
Yuji Oishi
Kei Iwata
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