PREFABRICATED PILE IN WHICH DIAMETER CAN BE EXPANDED AND ITS EXECUTION METHOD

摘要

PROBLEM TO BE SOLVED: To improve workability and reduce cost by forming a prefabricated pile in a structure, in which a diameter can be expanded, during the execution of works or after the execution of works. SOLUTION: Guide holes 4 penetrated from a pile hollow section 3 to a pile external surface are formed at a plurality of places in the longitudinal direction of a hollow prefabricated pile body 2. Diameter-expanding members 5 are housed in the guide holes 4 extending over the pile external surface from the pile hollow section 3. The pile body 2 is built into a ground so that the diameter-expanding members 5 are not projected from the pile external surface. The members 5 are pushed out to the pile external-surface side from the inside of the hollow section 3 and a diameter is expanded.