PILE FOUNDATION STRUCTURE

• Main Authors: KOBAYASHI HIROSHI, HISAZUMI KAZUMASA, YANAGI ETSUTAKA, NAITO AYANO, AGATA ATSUSHI, MYONAKA SHINJI, KUSAKA HIROTAKA
• Format: Patent
• Language: English; Japanese
• Published: 20.07.2023
• Subjects: EMBANKMENTS; EXCAVATIONS; FIXED CONSTRUCTIONS; FOUNDATIONS; HYDRAULIC ENGINEERING; SOIL SHIFTING; UNDERGROUND OR UNDERWATER STRUCTURES

To reinforce horizontal resistance of a foundation pile in which horizontal force and bending moment act on a pile head, in a liquefaction ground in which horizontal resistance of the side face of a ground improvement body cannot be expected.SOLUTION: A pile foundation structure includes a foundation pile 2 for supporting a structure constructed on a liquefaction ground G1, and a ground improvement body 3 formed around the foundation pile 2, wherein the ground improvement body 3 is provided in the state where the lower end of the ground improvement body 3 is embedded in a non-liquefaction layer G2 positioned below the liquefaction ground G1, a shaft part of the foundation pile 2 is provided with a deviation stopper part 21 of an uneven shape functioning as a deviation stopper between the ground improvement body 3 and the shaft part thereof, and at least a part of the deviation stopper part 21 is arranged in a region of the shaft part forming a compressive truss T between the bottom part of the ground improvement body 3a and at least the part thereof.SELECTED DRAWING: Figure 1 【課題】地盤改良体の側面の水平抵抗が期待できない液状化地盤において、水平力や曲げモーメントが杭頭に作用する基礎杭の水平抵抗を強化することができる。【解決手段】液状化地盤Ｇ１上に構築される構造物を支持する基礎杭２と、基礎杭２の周囲に形成される地盤改良体３と、を備え、地盤改良体３は、地盤改良体３の下端が前記液状化地盤Ｇ１の下に位置する非液状化層Ｇ２に根入れされた状態で設けられ、基礎杭２の軸部には、地盤改良体３との間でずれ止めとして機能する凹凸形状のずれ止め部２１が設けられ、ずれ止め部２１の少なくとも一部は、改良体底部３ａとの間に圧縮トラスＴを形成する軸部の領域に配置されている杭基礎構造を提供する。【選択図】図１