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VACUUM CONSOLIDATION METHOD, VACUUM CONSOLIDATION DREDGE METHOD, VACUUM CONSOLIDATION TEST SYSTEM, VERTICAL DRAIN DRIVING MACHINE, AND AIR TIGHT LOADING CAISSON
To solve a problem such that an acute consolidation-promoting effect of a vacuum boiling consolidation method is not sufficiently utilized in its feature because of unclear mechanism, for example, in a sludge ground on the sea bed or the like, or an enlarged air-tight loading caisson used for the vacuum boiling consolidation method for the seabed ground and a vacuum consolidation dredge method causes the excessive enlargement of an exclusive work ship and drastic increase in a construction cost.SOLUTION: An acute consolidation-promoting effect is found out to be a fine bubble effect generated in interstitial water by reduced-pressure boiling. A required amount of fine bubbles varies depending on a cation exchange capacity in the ground, and the amount of fine bubbles depends on a boiling time. Therefore, an effective boiling time is calculated by a vacuum consolidation test and is incorporated into a vacuum consolidation process. If the required amount of fine bubbles cannot be secured through short time boiling, fine bubbles are produced by a generator so as to replenish the shortage. Also, an enlarged air-tight loading caisson adopts a self-submerging type air-tight loading caisson without using an exclusive work ship so that a construction cost can be drastically reduced and a public construction cost on a coastal sea area can be reduced.SELECTED DRAWING: Figure 7
【課題】真空沸騰圧密工法の急激な圧密促進効果は、メカニズムが明確でないため、その特性を十分に活かしきれていない。例えば、海底のヘドロ地盤等である。また、海底地盤の当該工法及び真空圧密浚渫工法に使用する気密載荷函体は、巨大化すると専用作業船も超巨大化して建造費が巨額となる。【解決手段】急激な圧密促進効果は、減圧沸騰により間隙水中に発生するファインバブル効果であることを突き止めた。必要なファインバブル量はその地盤の陽イオン交換容量に左右され、ファインバブル量は沸騰時間に依存する。そこで有効沸騰時間を真空圧密試験で求めて真空圧密の工程に組み入れた。また、短時間の沸騰で必要なファインバブル量が確保できない場合は、ファインバブル水を発生装置で製造して不足分を補充する。また、巨大な気密載荷函体は、専用作業船を使わずに自潜航式の気密載荷函体とすることで建造費の大幅な縮減化を図り、ひいては沿岸海域の公共事業費の縮減化とした。【選択図】図７
VACUUM CONSOLIDATION METHOD, VACUUM CONSOLIDATION DREDGE METHOD, VACUUM CONSOLIDATION TEST SYSTEM, VERTICAL DRAIN DRIVING MACHINE, AND AIR TIGHT LOADING CAISSON
To solve a problem such that an acute consolidation-promoting effect of a vacuum boiling consolidation method is not sufficiently utilized in its feature because of unclear mechanism, for example, in a sludge ground on the sea bed or the like, or an enlarged air-tight loading caisson used for the vacuum boiling consolidation method for the seabed ground and a vacuum consolidation dredge method causes the excessive enlargement of an exclusive work ship and drastic increase in a construction cost.SOLUTION: An acute consolidation-promoting effect is found out to be a fine bubble effect generated in interstitial water by reduced-pressure boiling. A required amount of fine bubbles varies depending on a cation exchange capacity in the ground, and the amount of fine bubbles depends on a boiling time. Therefore, an effective boiling time is calculated by a vacuum consolidation test and is incorporated into a vacuum consolidation process. If the required amount of fine bubbles cannot be secured through short time boiling, fine bubbles are produced by a generator so as to replenish the shortage. Also, an enlarged air-tight loading caisson adopts a self-submerging type air-tight loading caisson without using an exclusive work ship so that a construction cost can be drastically reduced and a public construction cost on a coastal sea area can be reduced.SELECTED DRAWING: Figure 7
【課題】真空沸騰圧密工法の急激な圧密促進効果は、メカニズムが明確でないため、その特性を十分に活かしきれていない。例えば、海底のヘドロ地盤等である。また、海底地盤の当該工法及び真空圧密浚渫工法に使用する気密載荷函体は、巨大化すると専用作業船も超巨大化して建造費が巨額となる。【解決手段】急激な圧密促進効果は、減圧沸騰により間隙水中に発生するファインバブル効果であることを突き止めた。必要なファインバブル量はその地盤の陽イオン交換容量に左右され、ファインバブル量は沸騰時間に依存する。そこで有効沸騰時間を真空圧密試験で求めて真空圧密の工程に組み入れた。また、短時間の沸騰で必要なファインバブル量が確保できない場合は、ファインバブル水を発生装置で製造して不足分を補充する。また、巨大な気密載荷函体は、専用作業船を使わずに自潜航式の気密載荷函体とすることで建造費の大幅な縮減化を図り、ひいては沿岸海域の公共事業費の縮減化とした。【選択図】図７
VACUUM CONSOLIDATION METHOD, VACUUM CONSOLIDATION DREDGE METHOD, VACUUM CONSOLIDATION TEST SYSTEM, VERTICAL DRAIN DRIVING MACHINE, AND AIR TIGHT LOADING CAISSON
真空圧密工法と真空圧密浚渫工法及び真空圧密試験のシステムと鉛直ドレーン打設機と気密載荷函体
KONDO MASAYOSHI (author)
2022-10-07
Patent
Electronic Resource
Japanese
IPC:
E02D
FOUNDATIONS
,
Gründungen
VACUUM CONSOLIDATION METHOD, VACUUM CONSOLIDATION DREDGING METHOD, AND VERTICAL DRAIN
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