| 摘要 |
PROBLEM TO BE SOLVED: To improve the working property of measurement by providing an optical wave range finder on a clamp attachably and detachably mounted within a steel pipe pile, and measuring the height of the pipe earth at the time of penetrating the pipe into the ground. SOLUTION: A clamp 3 attachably and detachably mounted within an open end steel pipe pile 1 has an optical wave range finder 4 to measure the height (h) of the pipe earth 2 intruding into the pile 1 in no contact. The position of the range finder 4 is set within a limit distance related to the clamp set error and the beam characteristic so that an optical wave beam 5 never interferes with the inner wall of the pile 1. When an open end steel pipe pile having a blade on the lower end outer surface thereof is rotated and pressed into the ground, the range finder 4 is provided on the pile in the same manner, and the pipe earth height measurement data is radio transmitted from a transmitter provided at the top of the pile to a receiver on the ground to measure the height of the pipe earth intruding into the pipe in no contact in the penetration of the pile to the ground. According to this, the measurement can be safely performed without interrupting the penetrating work of the pile, and the tip support force of the pile can be precisely evaluated.
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