PROBLEM TO BE SOLVED: To provide a ground improvement device that easily and securely prevent pollution diffusion in water, can securely improve the water bottom ground at low cost, and can maintain a peripheral environment in an excellent state during over-water construction.SOLUTION: A ground improvement device 10 that has an agitation blade 22 fitted to a tip side of a rotary shaft 20 and a cylindrical pollution prevention frame 30 with a ceiling part 31 fitted so as to cover the agitation blade 22, and improves the ground by moving up and down the rotary shaft 20, and agitating and mixing the water bottom ground C by the agitation blade 22 while discharging a solidification material is provided with an insertion hole 33 into which the rotary shaft 20 is inserted at the ceiling pat 31 of the pollution prevention frame 30, and also provided with a seal material 34 which seals a gap between the insertion hole 33 and the rotary shaft 20. Further, the ceiling part 31 of the pollution prevention frame 30 is provided with an air vent 36 and also provided with a selector valve 37 which opens and closes the air vent 36.
【課題】水中の汚濁拡散を簡単かつ確実に防止して、水底地盤を確実かつ低コストで改良することができ、かつ、水上施工時に周辺環境を良好な状態に維持することができる地盤改良装置を提供する。【解決手段】回転軸20の先端側に攪拌翼22を取り付けると共に、攪拌翼22を覆うように天井部31を有した筒状の汚濁防止枠体30を取り付け、回転軸20を上下動させ、水底地盤Cを固化材を吐出しながら攪拌翼22により攪拌混合して地盤改良するようにした地盤改良装置10において、汚濁防止枠体30の天井部31に、回転軸20を挿通させる挿通孔33を設けると共に、挿通孔33と回転軸20との隙間をシールするシール材34を設けた。また、汚濁防止枠体30の天井部31に、空気抜き孔36を設けると共に、空気抜け孔36を開閉させる切替バルブ37を設けた。【選択図】図2
GROUND IMPROVEMENT DEVICE AND GROUND IMPROVEMENT METHOD USING THE DEVICE
地盤改良装置及び該装置を用いる地盤改良方法
2015-08-24
Patent
Electronic Resource
Japanese
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