GROUT INJECTION ROD FOR IMPROVING GROUND

摘要

PURPOSE:To raise the efficiency of injection operation of two kinds or more of grouts by a method in which joints are provided midway in plural liquid-passing tubes and the upper and lower parts of them are fitted to each other in mutually slidable manner over a desired long range and also in a liquid tight manner. CONSTITUTION:Liquid-passing tubes 10A and 10B are divided into upper and lower parts at joints 10A2 and 10B2 provided midway, and the lower sides of the upper parts are loosely inserted into the upper sides of the lower parts. Outward flanges 10A3 and 10B3 are formed on the lower ends of the upper parts, inward flanges 10A4 and 10B4 are formed on the upper ends of the lower parts, and they are liquid-tightly fitted with the inside faces of the lower parts and also with outside faces of the upper parts. When a group injection part 5 is exposed from a protective sleeve tube 4, even the upper parts of the liquid-passing tubes 10A and 10B can follow and move the sleeve tube 4 and thereby communication between the liquid-passing tubes 10A1 and 10B1 can be kept.