A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
SAND GROUND IMPROVEMENT METHOD AND EXCAVATION DEVICE FOR GROUND IMPROVEMENT
To provide a sand ground improvement method and an excavation device for ground improvement efficiently constructing a drain hole (a crushed rock hole) using crushed rocks for prevention of liquidation of the sand ground by consolidation.SOLUTION: An excavation device is provided with: a casing 1 with a specific length; an excavation rod 2 embedded in the casing 1 and arranged with an excavation part 22 provided with an excavation bit at a lower end and a press-in spiral blade right above the excavation bit; and a cap body 3 detachably attached on the upper end of the casing 1 and provided with a joint part to an upper part of the excavation rod 2. The sand ground improvement method comprises steps of attaching the excavation device to an excavation machine body A to vertically construct the casing 1 through non-soil discharge drilling excavation using the excavation part 22, then throwing in crushed rocks C from the upper end of the casing 1 after removing a cap body 3, compacting and filling the crushed rocks C by vertical motion of the excavation rod 2, and constructing a crushed rock pile D in the sand ground B by pulling up an excavation device.SELECTED DRAWING: Figure 3
【課題】砂地盤の液状対策として砕石によるドレン孔（砕石杭）を圧密に且つ効率的に構築する砂地盤改良工法並びに地盤改良用掘削装置を提供する。【解決手段】所定長のケーシング１と、ケーシング１に内装され、下端に掘削ビット及び掘削ビット直上に抑え込み螺旋羽根を備えた掘削部２２を設けた掘削ロッド２と、ケーシング１上端に着脱自在に被冠装着すると共に、掘削ロッド２上端との連結部を設けたキャップ体３とで構成した掘削装置を、掘削機体Ａに装着して掘削部２２による無排土穿孔掘削によってケーシング１の立て込みを行い、しかる後キャップ体３を分離してケーシング１上端から砕石Ｃを投入し、投入された砕石Ｃを掘削ロッド２の上下動による砕石Ｃの圧密充填を行い、掘削装置を引き抜いて砂地盤Ｂに砕石杭Ｄを構築する。【選択図】図３
SAND GROUND IMPROVEMENT METHOD AND EXCAVATION DEVICE FOR GROUND IMPROVEMENT
To provide a sand ground improvement method and an excavation device for ground improvement efficiently constructing a drain hole (a crushed rock hole) using crushed rocks for prevention of liquidation of the sand ground by consolidation.SOLUTION: An excavation device is provided with: a casing 1 with a specific length; an excavation rod 2 embedded in the casing 1 and arranged with an excavation part 22 provided with an excavation bit at a lower end and a press-in spiral blade right above the excavation bit; and a cap body 3 detachably attached on the upper end of the casing 1 and provided with a joint part to an upper part of the excavation rod 2. The sand ground improvement method comprises steps of attaching the excavation device to an excavation machine body A to vertically construct the casing 1 through non-soil discharge drilling excavation using the excavation part 22, then throwing in crushed rocks C from the upper end of the casing 1 after removing a cap body 3, compacting and filling the crushed rocks C by vertical motion of the excavation rod 2, and constructing a crushed rock pile D in the sand ground B by pulling up an excavation device.SELECTED DRAWING: Figure 3
【課題】砂地盤の液状対策として砕石によるドレン孔（砕石杭）を圧密に且つ効率的に構築する砂地盤改良工法並びに地盤改良用掘削装置を提供する。【解決手段】所定長のケーシング１と、ケーシング１に内装され、下端に掘削ビット及び掘削ビット直上に抑え込み螺旋羽根を備えた掘削部２２を設けた掘削ロッド２と、ケーシング１上端に着脱自在に被冠装着すると共に、掘削ロッド２上端との連結部を設けたキャップ体３とで構成した掘削装置を、掘削機体Ａに装着して掘削部２２による無排土穿孔掘削によってケーシング１の立て込みを行い、しかる後キャップ体３を分離してケーシング１上端から砕石Ｃを投入し、投入された砕石Ｃを掘削ロッド２の上下動による砕石Ｃの圧密充填を行い、掘削装置を引き抜いて砂地盤Ｂに砕石杭Ｄを構築する。【選択図】図３
SAND GROUND IMPROVEMENT METHOD AND EXCAVATION DEVICE FOR GROUND IMPROVEMENT
砂地盤改良工法及び地盤改良用掘削装置
HATAKEYAMA MASAKI (author) / ITO AKIHIRO (author)
2022-06-28
Patent
Electronic Resource
Japanese
IPC:
E02D
FOUNDATIONS
,
Gründungen
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