END BEARING CAPACITY ESTIMATION METHOD OF ROTARY PRESS-IN PILE, END BEARING CAPACITY CONTROL SYSTEM, CONSTRUCTION CONTROL METHOD AND PROGRAM

• Main Authors: ISHIHAMA YOSHIRO, TODA KAZUHIDE, TANABE MASAKAZU, YANAGI ETSUTAKA, MYONAKA SHINJI, KUSAKA HIROTAKA
• Format: Patent
• Language: English; Japanese
• Published: 04.06.2020
• Subjects: EMBANKMENTS; EXCAVATIONS; FIXED CONSTRUCTIONS; FOUNDATIONS; HYDRAULIC ENGINEERING; SOIL SHIFTING; UNDERGROUND OR UNDERWATER STRUCTURES

To provide an end bearing capacity estimation method capable of coping with unevenness of a bearing layer and improving the construction quality, by correctly estimating the end bearing capacity of a rotary press-in pile in a rotary press-in construction method.SOLUTION: An end bearing capacity estimation method of a rotary press-in pile estimates the end bearing capacity of the rotary press-in pile in construction work of rotary press-in of the rotary press-in pile formed of an open-tip steel pipe pile into the ground, and has the steps of: inputting press-in force Qin and rotational torque T measured at the construction time; and estimating an end bearing capacity Ru of the rotary press-in pile, using the press-in force Qin and the rotational torque T measured at the construction time, on the basis of an end bearing capacity estimation formula expressed by a formula (1) formulated from correlation of the press-in force Qin, the end bearing capacity Ru and the rotational torque T of the rotary press-in pile.SELECTED DRAWING: None 【課題】回転圧入工法における回転圧入杭の先端支持力を的確に推定することで、支持層の不陸にも対応可能となり、施工品質を向上させることができる先端支持力推定方法を提供する。【解決手段】杭先端が解放された鋼管杭からなる回転圧入杭を地盤に回転圧入する施工時に、回転圧入杭の先端支持力を推定する回転圧入杭の先端支持力推定方法であって、施工時に測定された、圧入力Ｑｉｎ、回転トルクＴを入力する工程と、施工時に測定した圧入力Ｑｉｎ、回転トルクＴを使用し、回転圧入杭における圧入力Ｑｉｎ、先端支持力Ｒｕ、及び回転トルクＴの相関関係から定式化した（１）式で表される先端支持力推定式に基づいて、回転圧入杭の先端支持力Ｒｕを推定する工程と、を有する。[数１][数２]【選択図】なし