GROUND IMPROVEMENT SYSTEM

PROBLEM TO BE SOLVED: To provide a ground improvement system that enables ground improvement in a space with a height limit, and suppresses overflowing and back flow of sludge.SOLUTION: A ground improvement system 10 has: a construction machine 20 installed in an underground slab (floor slab 104) in the position lower than a ground water level W; a cylindrical rod 30 with a length more than a distance from a tip end of a ground improvement pile 12 constructed in the ground 200 by a construction machine 20 to the construction machine 20, and capable of being inserted in the ground 200 and pivoted while penetrating through multi-story slabs and being maintained in the construction machine 20; an injector 40 mounted in the tip end of the rod 30; and an injection machine 50 including a hose connected to the rear end of the rod 30 (cement hose 52A, drilled hole water hose 54A, air hose 56A), and feeding a ground improvement agent, air or water through the rod 30 to be injected from the injector 40.SELECTED DRAWING: Figure 1 【課題】高さ制限のある空間での地盤改良を可能とし、排泥の溢れ出しや逆流を抑制する。【解決手段】地盤改良システム１０は、地下水位Ｗより低い位置にある地下のスラブ（床スラブ１０４）に設置される造成機２０と、造成機２０で地盤２００に造成される地盤改良杭１２の先端部から造成機２０までの距離以上の長さで複数階のスラブを貫通して造成機２０に保持されて、地盤２００へ挿入可能かつ旋回可能とされた筒状のロッド３０と、ロッド３０の先端部に取付けられた噴射器４０と、ロッド３０の後端部に接続されるホース（セメントホース５２Ａ、削孔水ホース５４Ａ、空気ホース５６Ａ）を備え、ロッド３０を通じて地盤改良材、空気又は水を送り噴射器４０から噴射させる注入機５０と、を有する。【選択図】図１