Abstract: To obtain data having high reliability required for determining bearing capacity of the pile in a short time and economically, a pseudostatic pile load testing method comprises processes that a drop height of a heavy weight (2) dropped on a pile head of a pile (1) is changed higher step by step, the heavy weight (2) is dropped from each of the heights, a time change of an acceleration of the pile head by that impact is determined by an accelerometer (4) installed at the pile head, and a displacement of the pile head is determined as an integrated value of the acceleration determined by the accelerometer (4).

Abstract: To obtain data having high reliability required for determining bearing capacity of the pile in a short time and economically, a pseudostatic pile load testing method comprises processes that a drop height of a heavy weight (2) dropped on a pile head of a pile (1) is changed higher step by step, the heavy weight (2) is dropped from each of the heights, a time change of an acceleration of the pile head by that impact is determined by an accelerometer (4) installed at the pile head, and a displacement of the pile head is determined as an integrated value of the acceleration determined by the accelerometer (4).

Abstract: A mechanical anchor includes an anchor unit that is divided into a plurality of divided anchor units which are movably connected to a tension rod to be moved in lateral directions. The anchor unit is opened or closed by the movement of the divided anchor units, and the anchor unit forms a cylindrical shape when the divided anchor units are closed. A driving member for opening or closing the anchor unit is mounted on an inner side of the anchor unit in such manner that the driving member is extended in a longitudinal direction of the anchor unit. The driving member and each of the divided anchor units are connected with each other so that the driving force of the driving member is equally applied on each of the divided anchor units.

Abstract: A mechanical ground anchor is provided including an anchor body having a plurality of parts forming a cylindrical shape. The parts forming the cylindrical shape are mounted to be opened and closed in the horizontal direction by a slide mechanism and a drive mechanism for opening and/or closing the anchor body on a core material. Thus, it is possible to enlarge the section performance of the slide mechanism between the core material and anchor body, it thus is also possible to increase rotational torque and/or tensile strength, and in case of self-boring, hard soil foundation boring and extremely deep evacuation can be easily performed as a result.