To obtain a method for searching the ground in an original position which can speedily and lightly perform the ground search and can be applied to various grounds so as to obtain the main information of a ground search such as CE.
When a resistor 62 is pierced into the ground by striking a knocking head 61 by a hammer, a cushioning material 60 is attached between the hammer and the knocking head 61 so as to delay the transmission of impact energy, thereby lengthening a loading time. A hammer-fall starting time is detected by a detector, and a plurality of measurements of ground reaction forces and shearing forces are carried out within a loading time. Furthermore, metal collision noise is reduced by the cushioning material 60 while in order to reduce frictional resistance, a piston serving also as a plumb bob is suspended by an elastic material in a cylinder storing a lubricant fluid and mounted to an upper part or inside the resistor 62. The plum bob is vertically oscillated by the striking so as to exude the lubricant fluid by pressure fluctuation to the target face through a passage connected to the cylinder.
SAKATE MICHIAKI
SAKAI KAZUO
TOYOOKA YOSHINORI
KISO JIBAN CONSULTANTS CO LTD
DOYU DAICHI CO LTD
TOYOOKA YOSHINORI
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