TENSIONING FORCE ESTIMATION METHOD OF EXISTING ANCHOR AND GROUND SOUNDNESS EVALUATION METHOD

PROBLEM TO BE SOLVED: To provide a tensioning force estimation method of an existing anchor and a ground soundness evaluation method that are superior in working efficiency.SOLUTION: Two-stage loads are loaded to a reference anchor 30, and a reference acoustic wave is generated by striking the refer...

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Main Authors SASAKI HIROSHI, SAKAMOTO HIROYUKI, KUDA TAKAYUKI, YOKOTA KOICHI, SUZUKI KEIICHI, YAMASHIRO YUKI
Format Patent
LanguageEnglish
Japanese
Published 05.02.2015
Subjects
EMBANKMENTS
EXCAVATIONS
FIXED CONSTRUCTIONS
FOUNDATIONS
HYDRAULIC ENGINEERING
MEASURING
MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER,MECHANICAL EFFICIENCY, OR FLUID PRESSURE
PHYSICS
SOIL SHIFTING
TESTING
UNDERGROUND OR UNDERWATER STRUCTURES
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Summary:PROBLEM TO BE SOLVED: To provide a tensioning force estimation method of an existing anchor and a ground soundness evaluation method that are superior in working efficiency.SOLUTION: Two-stage loads are loaded to a reference anchor 30, and a reference acoustic wave is generated by striking the reference anchor 30 in an anchor axial direction in each stage of this loading. A dominant frequency of a reflected wave is acquired which is derived from the reference acoustic wave, and based on the dominant frequency and the load when striking, a correlation equation of both is created. Alternatively, an estimating acoustic wave is generated by striking an existing anchor 10 becoming a target of estimation in the anchor axial direction, and the dominant frequency of a reflected wave derived from the estimating acoustic wave is acquired. The load obtained by substituting the dominant frequency in the correlation equation is estimated to be a tensioning force of the existing anchor 10, and a test in confirmation of the residual tensioning force is performed to an anchor out of a predetermined range in this estimated tensioning force to thereby evaluate the soundness of the ground G. 【課題】作業効率に優れる既設アンカーの緊張力推定方法及び地盤の健全性評価方法とする。【解決手段】基準用アンカー３０に対して２段階の荷重を載荷すると共に、この載荷の各段階において基準用アンカー３０をアンカー軸方向に打撃して基準用弾性波を発生させる。この基準用弾性波に由来する反射波の卓越周波数を取得し、この卓越周波数と打撃した際の荷重とに基づいて両者の相関関係式を作成する。他方、推定の対象となる既設アンカー１０をアンカー軸方向に打撃して推定用弾性波を発生させ、この推定用弾性波に由来する反射波の卓越周波数を取得する。この卓越周波数を相関関係式に代入して得られた荷重を既設アンカー１０の緊張力と推定し、また、この推定緊張力が所定範囲外のアンカーに対しては残存緊張力を確認する試験を行って地盤Ｇの健全性を評価する。【選択図】図１
Bibliography:Application Number: JP20130155473