2017 Volume 73 Issue 2 Pages 116-130
The “high-standard micro-piles method” which is also possible at a narrow space, low altitude head condition and low cost has been developed as a new construction method for reinforcing existing foundation structures. Micro-piles are constructed with double tube excavation using by boring machine. After inserting a steel pipe into the hole, grouts are filled both inside and outside of pile.
This paper describes the results of bending load test of pile and horizontal load test of constructed pile. By these load test results, the following things could be confirmed. 1) The joint of steel pipe of bending load and flexural rigidity have higher performances than only steel pipe of those, 2) It was confirmed that the lateral ground reaction coefficient in ground lateral displacement exceeds that coefficient calculated from deformation coefficient of investigation and test results indicating by specifications for highway bridges and building foundation design guidance.