鋼管群杭を用いた線路上空建築物の設計手法

摘要

The pile constructions of over-track buildings, which often result in large-diameter piles, have many restrictions, because it has cast-in-place concrete piles without footing beams. There is a way to replace a large-diameter pile with a pile group of small-diameter steel pipe. In this report, static axial couple load tests of the screwed steel piles and cyclic bending shear load tests on the reinforced concrete joints between a steel pipe pile group and the column are conducted to obtain the effect of the pile group on vertical resistance at the pile tip and the mechanical properties of the reinforced concrete joint. A structural design method of over-track buildings with steel pipe pile groups is proposed based on the experimental test results.%線路上空建築物に適用できる1柱-複数杭構造の構造設計手法を提案するため，模型地盤及び実地盤における小口径羽根付き鋼管杭の偶力載荷実験を行い，偶力作用下での群杭効果を確認した。また，1柱-2杭形式接合部の正負交番実験及び杭頭接合部の変動軸力下での正負交番実験を行い，1柱-複数杭構造の力学挙動を確認した。以上を基に既往の線路上空建築物の構造設計指針の中で鋼管群杭を適用する場合の設計手法（案）を提案した。