To provide an axial force measurement method of a ground improvement pile which measures transmission state of axial force of the ground improvement pile after construction of a structure and evaluates intermittently vertical supporting force by calculating proportional division between tip bearing force and peripheral surface friction force from axial force distribution.
A core hole is provided in the depth direction of the center portion of the ground improvement pile after the ground improvement pile is formed and specified strength is exhibited. A plurality of strain gauges are inserted into the core hole in the depth direction with specified intervals maintained. Soil cement with the same formulation as that of the ground improvement pile is injected into the core hole and the strain gauge is integrated with the ground improvement pile. Thereafter, the structure is constructed on the ground improvement pile, and the transmission state of the axial force of the ground improvement pile which is loaded with weight of the structure is measured by the plurality of the strain gauges. The vertical supporting force is evaluated by calculating the proportional division between the tip supporting force and the peripheral surface friction force based on the measurement of the axial force distribution in the depth direction.
YAMADA TAKESHI
OKAMOTO KEN
YAMAMOTO HIROSHI
SUZUKI NAOMIKI
