STEEL PIPE PILE WITH SPIRAL BLADES, COMPOSITE PILE, AND CONSTRUCTION METHOD OF COMPOSITE PILE

摘要

Provided is a spiral shaped blade-equipped steel pipe pile that can effectively improve comparatively soft ground in which the clay stratum and the like exists, to a position below the ground surface several meters deep. A spiral shaped blade-equipped steel pipe pile (1) is provided with a steel pipe pile main body (10) and at least one spiral shaped blade (20) which is attached to the steel pipe pile main body (10), wherein the diameter (D) of the spiral shaped blade (20) is set to be at least three times the diameter (d) of the steel pipe pile main body (10).