| 摘要 |
The present invention relates to an underground grouting device capable of preventing damage to adjoining buildings or the stability of a tunnel by obtaining a grouting effect while preventing ground displacement on a cut or excavated portion in a tunnel construction site or an urban building construction site. The present invention includes a multi-channel plate forming an inner hollow unit having a closed cross section by attaching the lateral surfaces of one packer circular steel pipe and at least two grouting circular steel pipe; multiple base members installed at constant intervals around the multi-channel plate and forming a multi-layered grouting material injection space; and multiple packers attached to the base members respectively. The base member includes the inner surface formed into a shape that multiple arcs wherein the projected multi-channel plate is inserted and adhere are continued, and the outer surface formed into a flat cylindrical shape. A watertight material is filled inside the hollow unit having the closed cross section. A packing injection hole connected to the inside of the packers by penetrating through each base member is formed on the packer circular steel pipe. A grouting material injection hole positioned only in one grouting material injection space is formed each on the grouting circular steel pipe. The present invention is characterized in that the grouting material injection hole is positioned one between a contact point of the grouting material injection hole to the adjoining circular steel pipe and a contact point of one among common tangents and the grouting material injection hole and between contact points of the grouting material injection hole and the adjoining circular steel pipes on both sides. |
