It is common to manage the construction using the Hailey’s formula, when steel pipe piles used for foundations of port facilities. It is known that the estimated value of the axial resistance of piles by the Hailey’s formula varies greatly. Measured values such as pile penetration and temporary compression used in the Hailey’s formula calculation are considered to be affected by the impact energy of the hydraulic hammer. Therefore, when constructing the pier support piles in the Tobishima area of Nagoya Port, we measured the pile penetration and temporary compression with the input energy kept constant, and tried to examine their interrelationships.
　As a result, it was confirmed that the change in the depth direction of the cumulative energy obtained as the product of the input energy and the number of blow corresponds to the SPT-N value of the ground to a certain extent. In addition, by confirming the value of the penetration with the input energy at the same level, it was shown that it could be used as a reference to judge whether a certain pile has the same construction condition as the other piles. On the other hand, the amount of temporary compression varies widely even when the input energy is the same, and it seems to be inferior as a construction management index. Furthermore, according to the measured values obtained on the site, it was shown that the estimated value by the Hailey’s formula was roughly proportional to the ratio of the input energy and the pile penetration. The ratio varies more than the penetration measured with the input energy constant, but it seems to be a reference for construction management to some extent.
　As described above, possibly a construction management index with relatively small variation could be obtained by measuring the pile penetration and temporary compression with the input energy constant, but it is uncertain whether this relationship holds at other sites. It is a topic for future study. By carefully and comprehensively verifying the changes in the depth direction of the measured values at each site and the changes in the relationship between the measured values, it is important to confirm whether the pile is constructed in the same way as the piles used for loading tests or the other piles at the same site.
Keyword: Steel pipe pile, Quality control for pile driving, Hiley’s formula, Dynamic loading test, Pile penetration, Temporary compression