GROUND IMPROVEMENT MACHINE

To provide a ground improvement machine equipped with a rod stopper member capable of properly regulating the extension of a telescopic rod without impairing workability.SOLUTION: A ground improvement machine comprises a leader that can be raised and lowered provided in the front part of an upper revolving body, a rotary drive unit that raises and lowers along the leader, a screw shaft that is attached to the rotary drive unit, and a swivel joint that is provided at the upper end of the screw shaft and to which a ground improvement agent injection hose is connected. The rotary drive unit is provided with a telescopic rod 33 that can be extended and retracted along the screw shaft, and the telescopic rod is connected to the swivel joint with a connecting member. The leader is formed so as to be raised and lowered into a working posture in which it stands vertically and a transport posture in which it is lowered backward from the state in which the rotary drive unit is held at the lower end. The upper revolving body is provided with a rod stopper member 35 that does not block the movement direction of the telescopic rod following the raising and lowering operation of the leader and blocks the extension direction of the telescopic rod in the transport posture.SELECTED DRAWING: Figure 4 【課題】作業性を損なわずに伸縮ロッドの伸長規制を適切に行うことが可能なロッドストッパ部材を備えた地盤改良機を提供する。【解決手段】地盤改良機は、上部旋回体の前部に起伏可能に設けられたリーダと、リーダに沿って昇降する回転駆動装置と、回転駆動装置に装着されるスクリューシャフトと、スクリューシャフトの上端に設けられて地盤改良剤の注入ホースが接続されるスイベルジョイントとを備え、回転駆動装置に、スクリューシャフトに沿って伸縮可能な伸縮ロッド３３を設け、伸縮ロッドとスイベルジョイントとを連結部材で連結し、リーダは、鉛直に起立させた作業姿勢と、回転駆動装置を下端部に保持した状態から後方に倒伏させた輸送姿勢とに起伏可能に形成され、上部旋回体には、リーダの起伏動作に従う伸縮ロッドの移動方向を遮らず、かつ、輸送姿勢で、伸縮ロッドの伸び方向を遮るロッドストッパ部材３５が設けられている。【選択図】図４