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Method for evaluating the number of impacts of hydraulic hammer, method for exploring front ground using the same, and system for exploring front ground
Method for evaluating the number of impacts of hydraulic hammer, method for exploring front ground using the same, and system for exploring front ground
PROBLEM TO BE SOLVED: To improve reliability when investigating soil properties of a front natural ground using a hydraulic hammer.SOLUTION: In an investigation method for a front natural ground, the natural ground 25 is bored by a hydraulic hammer 22, water supply pressure to the hydraulic hammer is measured by a water pressure gage 28 of a high pressure pump 27 connected to the hydraulic hammer to obtain the water supply pressure P (101), time fluctuation of the water supply pressure is measured by the water pressure gage 28 (102), a striking number of the hydraulic hammer 22 is identified by a processing unit 31 on the basis of fluctuation characteristic in the measured time fluctuation of the water supply pressure to obtain the striking number N (103), an energy index value M is calculated based on the formula (1) using the water supply pressure P and the striking number N (104), and soil properties of the front natural ground is estimated based on the energy index value M (105).SELECTED DRAWING: Figure 1
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