Dynamic loading system, dynamic loading method and dynamic loading test method for piles

摘要

A magnetostrictive vibrator including a core made of a magnetostrictive material and an exciting coil wound on the core is connected to the head of a pile and an electric current is fed into the exciting coil. A strain occurring in the magnetostrictive vibrator is transmitted to produce vibrations in the pile, wherein the amplitude and frequency of the vibrations is controlled by controlling the electric current fed into the exciting coil. The bearing capacity of the pile is estimated by detecting vibrations transmitted to the ground around the pile. A dynamic loading test of the pile is conducted in this fashion with ease and good controllability at low cost without the need for complicated analytical treatment, yet allowing a reliable estimation of the bearing capacity of the pile.