| 摘要 |
PROBLEM TO BE SOLVED: To provide a preboring H-steel pile having a frictional resistance increasing means on H-steel to increase frictional resistance of the H-steel to concrete greatly. SOLUTION: In this preboring H-steel pile formed by placing concrete around the H-steel and hardening it, the H-steel 1 is provided with the frictional resistance increasing means for raising frictional resistance to the concrete, and the frictional resistance increasing means is constituted by an opening 1A formed in a web of the H-steel 1. COPYRIGHT: (C)2010,JPO&INPIT
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