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LIQUEFACTION COUNTERMEASURE STRUCTURE OF GROUND IMPROVEMENT MAT FOUNDATION AND CORRECTION METHOD OF OCCURRENCE OF UNEQUAL SETTLEMENT BY LIQUEFACTION
PROBLEM TO BE SOLVED: To provide a liquefaction countermeasure structure of a ground improvement mat foundation and a correction method, capable of horizontally correcting a foundation by restraining cost, when the ground causes unequal settlement by liquefaction, while preventing the liquefaction.SOLUTION: A liquefaction countermeasure structure comprises a jack-up reaction ground improvement part 5 stronger in strength of the ground than a ground improvement part in its outer peripheral part adjacently to the ground improvement part 4 for a mat foundation. This jack-up reaction ground improvement part is formed by excavating a ground part for forming both ground improvement parts in parallel simultaneously with the ground improvement part 4 for the mat foundation, and also rolling after backfilling improvement soil mixed by adding a solidification material to a soil property excavated in a groove formed by the excavation. Its breadth W1 is formed with a small clearance capable of inserting a claw of a jack with the claw between an under surface of the foundation outer periphery and itself, by forming larger than a breadth W2 of the ground improvement part for the mat foundation so that the jack with the claw can be installed, and also lowering a height H1 up to the top end from its bottom surface a little more than a height H2 of the ground improvement part for the mat foundation.SELECTED DRAWING: Figure 2
【課題】液状化を防ぎつつも、液状化により地盤が不同沈下を起こした場合、コストを抑えて基礎を水平に修正可能な地盤改良ベタ基礎の液状化対策構造、及び修正方法を提供する。【解決手段】ベタ基礎用地盤改良部４に隣接してその外周部に、該地盤改良部より地盤の強度が強いジャッキアップ反力用地盤改良部５を有している。このジャッキアップ反力用地盤改良部は、ベタ基礎用地盤改良部４と同時並行的に両地盤改良部を形成する地盤部分を掘削し、かつ該掘削によって形成される溝に掘削した土質に固化材を添加して混合した改良土を埋め戻したうえ転圧することによって形成される。また、その横幅Ｗ１が爪付きジャッキが設置可能なようにベタ基礎用地盤改良部の横幅Ｗ２より大きく、かつその底面から天端までの高さＨ１がベタ基礎用地盤改良部の高さＨ２より若干低くして、基礎外周の下面との間に爪付きジャッキの爪が挿入可能な小隙間をおいて形成される。【選択図】図２
LIQUEFACTION COUNTERMEASURE STRUCTURE OF GROUND IMPROVEMENT MAT FOUNDATION AND CORRECTION METHOD OF OCCURRENCE OF UNEQUAL SETTLEMENT BY LIQUEFACTION
PROBLEM TO BE SOLVED: To provide a liquefaction countermeasure structure of a ground improvement mat foundation and a correction method, capable of horizontally correcting a foundation by restraining cost, when the ground causes unequal settlement by liquefaction, while preventing the liquefaction.SOLUTION: A liquefaction countermeasure structure comprises a jack-up reaction ground improvement part 5 stronger in strength of the ground than a ground improvement part in its outer peripheral part adjacently to the ground improvement part 4 for a mat foundation. This jack-up reaction ground improvement part is formed by excavating a ground part for forming both ground improvement parts in parallel simultaneously with the ground improvement part 4 for the mat foundation, and also rolling after backfilling improvement soil mixed by adding a solidification material to a soil property excavated in a groove formed by the excavation. Its breadth W1 is formed with a small clearance capable of inserting a claw of a jack with the claw between an under surface of the foundation outer periphery and itself, by forming larger than a breadth W2 of the ground improvement part for the mat foundation so that the jack with the claw can be installed, and also lowering a height H1 up to the top end from its bottom surface a little more than a height H2 of the ground improvement part for the mat foundation.SELECTED DRAWING: Figure 2
【課題】液状化を防ぎつつも、液状化により地盤が不同沈下を起こした場合、コストを抑えて基礎を水平に修正可能な地盤改良ベタ基礎の液状化対策構造、及び修正方法を提供する。【解決手段】ベタ基礎用地盤改良部４に隣接してその外周部に、該地盤改良部より地盤の強度が強いジャッキアップ反力用地盤改良部５を有している。このジャッキアップ反力用地盤改良部は、ベタ基礎用地盤改良部４と同時並行的に両地盤改良部を形成する地盤部分を掘削し、かつ該掘削によって形成される溝に掘削した土質に固化材を添加して混合した改良土を埋め戻したうえ転圧することによって形成される。また、その横幅Ｗ１が爪付きジャッキが設置可能なようにベタ基礎用地盤改良部の横幅Ｗ２より大きく、かつその底面から天端までの高さＨ１がベタ基礎用地盤改良部の高さＨ２より若干低くして、基礎外周の下面との間に爪付きジャッキの爪が挿入可能な小隙間をおいて形成される。【選択図】図２
LIQUEFACTION COUNTERMEASURE STRUCTURE OF GROUND IMPROVEMENT MAT FOUNDATION AND CORRECTION METHOD OF OCCURRENCE OF UNEQUAL SETTLEMENT BY LIQUEFACTION
地盤改良ベタ基礎の液状化対策構造、及び液状化による不同沈下発生の修正方法
ISHIDA TETSUYA (author) / TOGASHI SHIGERU (author)
2016-03-22
Patent
Electronic Resource
Japanese
IPC:
E02D
FOUNDATIONS
,
Gründungen
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