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CONSTRUCTION METHOD OF GROUND VIBRATION PREVENTION STRUCTURE
PROBLEM TO BE SOLVED: To provide a vibration countermeasure capable of contributing even to reduction in construction cost, while providing a vibration damping effect even for low frequency vibration of a weak ground to environmental vibration such as traffic vibration, construction work vibration and factory vibration.SOLUTION: In a construction method of a ground vibration prevention structure, a high rigid structure of a thickness H of a relatively higher rigid slab shape than the peripheral ground of a sedimentary layer thickness D1 on a hard support layer, is set so that the ratio of a target cutoff frequency (f) and a resonance frequency of the ground becomes α/2 or less of a wavelength (λ) of a vibration wave under a conditional expression (1)=f/f2<α(α=0.5-0.8), assuming an upper layer ground thickness of a depth range up to the high rigid structure including the ground surface or a foundation of a ground structure or a ground improvement layer under it by level raising of the support layer as D2 when D1 is shallow, and is set under a conditional expression (2)=f/f1<α(α=0.5-0.8) by determining a related resonance frequency f1based on an analysis of the whole-thickness ground of the improved ground, including a depth range H of the high rigid structure constructed just under D2 when D1 is deep.SELECTED DRAWING: Figure 7
【課題】交通振動、建設工事振動、工場振動などの環境振動に対して、軟弱地盤の低周波振動にも減振効果を得、かつ工費の低コスト化にも寄与し得る振動対策の提供。【解決手段】固い支持層上の堆積層厚さＤ1の周辺地盤より相対的に高い剛性版状の厚さＨの高剛性構造体を、Ｄ1が浅い場合は、支持層の嵩上げにより地表面又は地上構造物の基礎あるいはその下の地盤改良層を含めて高剛性構造体までの深さの範囲の上層地盤厚さをＤ2とし、目標遮断周波数ｆと地盤の共振周波数との比、条件式(1)=f/f2<α（α＝0.5〜0.8）の下で、振動波の波長(λ)のα/2以下になるように設定し、Ｄ1が深い場合は、Ｄ2の直下に構築した該高剛性構造体の深さの範囲Ｈを含めて、該改良地盤の全厚さ地盤の解析に基づいて関係する共振周波数f1＊を求め、条件式(2)=f/f1*<α（α＝0.5〜0.8）の下で設定する地盤振動防止構造体の構築方法。【選択図】図７
CONSTRUCTION METHOD OF GROUND VIBRATION PREVENTION STRUCTURE
PROBLEM TO BE SOLVED: To provide a vibration countermeasure capable of contributing even to reduction in construction cost, while providing a vibration damping effect even for low frequency vibration of a weak ground to environmental vibration such as traffic vibration, construction work vibration and factory vibration.SOLUTION: In a construction method of a ground vibration prevention structure, a high rigid structure of a thickness H of a relatively higher rigid slab shape than the peripheral ground of a sedimentary layer thickness D1 on a hard support layer, is set so that the ratio of a target cutoff frequency (f) and a resonance frequency of the ground becomes α/2 or less of a wavelength (λ) of a vibration wave under a conditional expression (1)=f/f2<α(α=0.5-0.8), assuming an upper layer ground thickness of a depth range up to the high rigid structure including the ground surface or a foundation of a ground structure or a ground improvement layer under it by level raising of the support layer as D2 when D1 is shallow, and is set under a conditional expression (2)=f/f1<α(α=0.5-0.8) by determining a related resonance frequency f1based on an analysis of the whole-thickness ground of the improved ground, including a depth range H of the high rigid structure constructed just under D2 when D1 is deep.SELECTED DRAWING: Figure 7
【課題】交通振動、建設工事振動、工場振動などの環境振動に対して、軟弱地盤の低周波振動にも減振効果を得、かつ工費の低コスト化にも寄与し得る振動対策の提供。【解決手段】固い支持層上の堆積層厚さＤ1の周辺地盤より相対的に高い剛性版状の厚さＨの高剛性構造体を、Ｄ1が浅い場合は、支持層の嵩上げにより地表面又は地上構造物の基礎あるいはその下の地盤改良層を含めて高剛性構造体までの深さの範囲の上層地盤厚さをＤ2とし、目標遮断周波数ｆと地盤の共振周波数との比、条件式(1)=f/f2<α（α＝0.5〜0.8）の下で、振動波の波長(λ)のα/2以下になるように設定し、Ｄ1が深い場合は、Ｄ2の直下に構築した該高剛性構造体の深さの範囲Ｈを含めて、該改良地盤の全厚さ地盤の解析に基づいて関係する共振周波数f1＊を求め、条件式(2)=f/f1*<α（α＝0.5〜0.8）の下で設定する地盤振動防止構造体の構築方法。【選択図】図７
CONSTRUCTION METHOD OF GROUND VIBRATION PREVENTION STRUCTURE
地盤振動防止構造体の構築方法
TAKEMIYA HIROKAZU (author)
2017-10-12
Patent
Electronic Resource
Japanese
IPC:
E02D
FOUNDATIONS
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Gründungen
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