FOUNDATION STRUCTURE, PILE HEAD STRUCTURE OF STEEL-PIPE PILE, AND CONSTRUCTION METHOD FOR FOUNDATION STRUCTURE

• Main Authors: NAITO HIROKO, TAKANO YOSHIHIRO
• Format: Patent
• Language: English; Japanese
• Published: 19.04.2018
• Subjects: EMBANKMENTS; EXCAVATIONS; FIXED CONSTRUCTIONS; FOUNDATIONS; HYDRAULIC ENGINEERING; SOIL SHIFTING; UNDERGROUND OR UNDERWATER STRUCTURES

PROBLEM TO BE SOLVED: To provide a foundation structure that enables joining by absorbing the horizontal misalignment of a pile axis of a steel-pipe pile and a column axis of an upper frame column, a pile head structure of a steel-pipe pile and a construction method for the foundation structure.SOLUTION: A connecting member 4 includes: an outer steel pipe 41 which is disposed between an upper frame column 2 and a steel-pipe pile 3 and has a cylindrical steel pipe 43 whose diameter is larger than the diameter of the steel-pipe pile 3 and a conical steel pipe 44 whose diameter decreases downward from the lower end of the cylindrical steel pipe 43; and a filled concrete 42 filled in the outer steel pipe 41. A part of the upper frame column 2 is connected to the outer steel pipe 41 via anchor bolts 22 fixed to the filled concrete 42. On an inner surface 43a of the cylindrical steel pipe 43, a misalignment stopper member 45 for increasing the adhesion force to the filled concrete 42 is provided. The connecting member 4 is configured such that, in a state in which at least a part of the conical steel pipe 44 is inserted into a pile head part 3A, the conical steel pipe 44 is welded at the contact point with the pile head part 3A.SELECTED DRAWING: Figure 1 【課題】鋼管杭の杭軸と上部架構柱の柱軸の水平方向のずれを吸収して接合することが可能である基礎構造、鋼管杭の杭頭構造、及び基礎構造の施工方法を提供する。【解決手段】上部架構柱２と鋼管杭３との間に配置され、鋼管杭３の杭径より大径の円筒状鋼管４３、及び円筒状鋼管４３の下端から下方に向けて縮径された円錐状鋼管４４を有する外鋼管４１と、外鋼管４１の内部に充填された充填コンクリート４２と、を備えた連結部材４が設けられ、上部架構柱２は、一部が充填コンクリート４２に固着されるアンカーボルト２２を介して外鋼管４１に接続され、円筒状鋼管４３の内面４３ａには、充填コンクリート４２との付着力を高めるためのずれ止め部材４５が設けられ、連結部材４は、杭頭部３Ａ内に円錐状鋼管４４の少なくとも一部が挿入された状態で、円錐状鋼管４４が杭頭部３Ａとの接点で溶着された構成となっている。【選択図】図１