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VACUUM CONSOLIDATION METHOD AND VERTICAL DRAIN
To solve the problem that in a vacuum consolidation method, a fluid pressure in a vertical drain is extremely low and is stably kept, most preferably, up to a tip of the vertical drain is intermittently made a vacuum state, a high vacuum pressure set in gap water of the ground is directly transmitted, and promotion of consolidation is enhanced; to that end, the gap water filling the drain needs to be temporarily replaced with air.SOLUTION: A cross-sectional area of a vertical drain that is used in a vacuum consolidation method and is meandered and deformed following ground subsidence is larger than a lower limit of a water conduction cross-sectional area required for a drain, and is smaller than an upper limit of such the water conduction cross-sectional area as to be capable of pushing up gap water filling an internal space with a compressed air pressure from the drain tip to the top in an integral state. In a consolidation progress step, the gap water filling the vertical drain is instantly moved to a gas-water separation tank through the top from the tip of the vertical drain with a vacuum pressure and the compressed air pressure, and the inside of the vertical drain is quickly decompressed and vacuum consolidation is continued. The consolidation step is performed as a cycle, and a high consolidation speed is kept and great shortage of consolidation time and increase of consolidation settlement are achieved.SELECTED DRAWING: Figure 1
【課題】真空圧密工法で最も重要な課題は鉛直ドレーン内の流体圧を極力低く、且つ安定的に保ことである。最善は断続的に鉛直ドレーンの先端部まで真空状態とし、地盤の間隙水に設定した高真空圧を直接伝達して圧密促進を強化する。そのためにはドレーン内に充満した間隙水を一時的に空気に置き換える必要がある。【解決手段】真空圧密工法に使用する地盤沈下に追随して蛇行変形する鉛直ドレーンの断面積は、ドレーンに必要な通水断面積の下限よりも大きく、且つドレーン先端部からの圧縮空気圧で内部空間に充満した間隙水を一体の状態で頂部へと押し上げることを可能とする通水断面積の上限よりも小さいものとする。圧密進行過程においては、真空圧と圧縮空気圧で鉛直ドレーンに充満している間隙水を鉛直ドレーンの先端部から頂部を経て気水分離タンクへと瞬時に移動させ、鉛直ドレーン内部を迅速に減圧して真空圧密を続行する。この圧密工程をサイクルとすることで、高圧密速度を維持して圧密時間の大幅な短縮と圧密沈下の増大を図る。【選択図】図１
VACUUM CONSOLIDATION METHOD AND VERTICAL DRAIN
To solve the problem that in a vacuum consolidation method, a fluid pressure in a vertical drain is extremely low and is stably kept, most preferably, up to a tip of the vertical drain is intermittently made a vacuum state, a high vacuum pressure set in gap water of the ground is directly transmitted, and promotion of consolidation is enhanced; to that end, the gap water filling the drain needs to be temporarily replaced with air.SOLUTION: A cross-sectional area of a vertical drain that is used in a vacuum consolidation method and is meandered and deformed following ground subsidence is larger than a lower limit of a water conduction cross-sectional area required for a drain, and is smaller than an upper limit of such the water conduction cross-sectional area as to be capable of pushing up gap water filling an internal space with a compressed air pressure from the drain tip to the top in an integral state. In a consolidation progress step, the gap water filling the vertical drain is instantly moved to a gas-water separation tank through the top from the tip of the vertical drain with a vacuum pressure and the compressed air pressure, and the inside of the vertical drain is quickly decompressed and vacuum consolidation is continued. The consolidation step is performed as a cycle, and a high consolidation speed is kept and great shortage of consolidation time and increase of consolidation settlement are achieved.SELECTED DRAWING: Figure 1
【課題】真空圧密工法で最も重要な課題は鉛直ドレーン内の流体圧を極力低く、且つ安定的に保ことである。最善は断続的に鉛直ドレーンの先端部まで真空状態とし、地盤の間隙水に設定した高真空圧を直接伝達して圧密促進を強化する。そのためにはドレーン内に充満した間隙水を一時的に空気に置き換える必要がある。【解決手段】真空圧密工法に使用する地盤沈下に追随して蛇行変形する鉛直ドレーンの断面積は、ドレーンに必要な通水断面積の下限よりも大きく、且つドレーン先端部からの圧縮空気圧で内部空間に充満した間隙水を一体の状態で頂部へと押し上げることを可能とする通水断面積の上限よりも小さいものとする。圧密進行過程においては、真空圧と圧縮空気圧で鉛直ドレーンに充満している間隙水を鉛直ドレーンの先端部から頂部を経て気水分離タンクへと瞬時に移動させ、鉛直ドレーン内部を迅速に減圧して真空圧密を続行する。この圧密工程をサイクルとすることで、高圧密速度を維持して圧密時間の大幅な短縮と圧密沈下の増大を図る。【選択図】図１
VACUUM CONSOLIDATION METHOD AND VERTICAL DRAIN
真空圧密工法と鉛直ドレーン
KONDO MASAYOSHI (author)
2021-05-20
Patent
Electronic Resource
Japanese
IPC:
E02D
FOUNDATIONS
,
Gründungen
VACUUM CONSOLIDATION METHOD, VACUUM CONSOLIDATION DREDGING METHOD, AND VERTICAL DRAIN
| European Patent Office | 2021
| European Patent Office | 2022
| European Patent Office | 2022