| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a construction method for reducing fuel consumption of a driving source of a vibrational pile driving machine.SOLUTION: The construction method is provided for driving or extracting a pile by using the vibrational pile driving/extracting machine having an exciter having a phase regulator for regulating a relative phase of a fixed-movable eccentric weight, and presets a phase regulation pattern by the phase regulator before driving-in of the pile so that the eccentric moment by the weight may change in response to a change in a measured N value by measuring the relationship between the depth of an object foundation and a change in the N value before the driving-in of the pile, and monitors whether or not respective tendencies of a change in the detected motor load ratio and a change in the measured N value, coincide within a predetermined allowable range by continuously detecting the motor load ratio during the driving-in of the pile, and drives or extracts the pile while regulating the phase by the phase regulator in response to a preset regulation pattern when its respective tendencies of the change in the motor load ratio and the change in the N value coincide within the predetermined allowable range.</p> |
