GROUND IMPROVEMENT DEVICE

• Main Authors: SAIGA MITSUHIRO, NOTO WATARU, TANAKA HATSUICHI, NAKAI KEIJI, AKIMA TAKESHI, TAKAMI SEIICHI
• Format: Patent
• Language: English; Japanese
• Published: 04.07.2022
• Subjects: EMBANKMENTS; EXCAVATIONS; FIXED CONSTRUCTIONS; FOUNDATIONS; HYDRAULIC ENGINEERING; SOIL SHIFTING; UNDERGROUND OR UNDERWATER STRUCTURES

To provide a ground improvement device capable of preventing problems such as a defective completed shape of a ground improvement body formed in the ground and abnormal displacement of the surrounding ground from occurring by enabling smooth discharging of sludge generated during ground improvement to a ground surface.SOLUTION: The ground improvement device comprises an injection nozzle 13 for injecting an improvement material S to a stirring head 7, the stirring head 7 being attached to the lower part of a tube rod 3 inserted into the ground, and injects the improvement material S through the injection nozzle 13 into the ground to improve the ground. The ground improvement device comprises a first sludge injection hole 15 for injecting water W or the mixture of the water W and air toward the upper part of the tube rod 3 in the stirring head 7 attached to the lower part of the tube rod 3, and a second sludge injection hole 16 for injecting air A toward the upper part of the tube rod 3 with a gap above the first sludge injection hole 15.SELECTED DRAWING: Figure 5 【課題】地盤改良を行うときに発生する排泥を、地表面に円滑に排出できるようにし、地盤中に造成する地盤改良体の出来形不良や周辺地盤の異常変位などの問題が発生するのを防止できる地盤改良装置を提供する。【解決手段】地盤中に貫入する管ロッド３の下部に攪拌ヘッド７を取り付け、攪拌ヘッド７に改良材料Ｓを噴射する噴射ノズル１３を備え、噴射ノズル１３より地盤中に改良材料Ｓを噴射して地盤改良を行う地盤改良装置であって、管ロッド３の下部に取り付ける攪拌ヘッド７に、管ロッド３の上部に向けて水Ｗ又は水Ｗとエアーの混合物を噴射する第一排泥用噴射孔１５を備え、第一排泥用噴射孔１５の上方に間隔を空けて管ロッド３の上部に向けてエアーＡを噴射する第二排泥用噴射孔１６を備える地盤改良装置である。【選択図】図５