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EVALUATION METHOD FOR STRIKING NUMBER OF HYDRAULIC HAMMER AND INVESTIGATION METHOD FOR FRONT NATURAL GROUND USING THE SAME, AND INVESTIGATION SYSTEM FOR FRONT NATURAL GROUND
EVALUATION METHOD FOR STRIKING NUMBER OF HYDRAULIC HAMMER AND INVESTIGATION METHOD FOR FRONT NATURAL GROUND USING THE SAME, AND INVESTIGATION SYSTEM FOR FRONT NATURAL GROUND
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机译：液压锤击打次数的评估方法和使用该方法的前自然地面调查方法以及前自然地面调查系统
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摘要
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 circumferential direction strain in a high pressure hose 29 is measured by a strain gage 19 stuck to the high pressure hose (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 circumferential direction strain 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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