| 摘要 |
PURPOSE:To prevent the adherence of gel substances to an injection pipe by a method in which an expandible bag is provided at the entrance of the tip of an inner tube and also at the entrance of the lower part of an outer tube and the entrances are closed by the expandible bag to change the flow path. CONSTITUTION:An expandible bag 4 is attached to the entrance 3 of an inner tube, and the other entrance 7 is covered with a rubber sleeve 8. Also, a lower discharge port 5 is provided at the tip portion lower than the expandible bag 4 of the outer tube 2, and an upper discharge port 6 and a check valve 9 are provided above the lower discharge port 5. Water glass aqueous solution or a mixture of water glass and a reacting agent is sent from the flow path 2a of the outer tube 2 and at the same time a reacting agent aqueous solution is sent from the flow path of the inner tube 1, whereupon the bag 4 is expanded to block the path 2a of the outer tube 2. Furthermore, the reacting aqueous solution coming from the discharge port 7 expands the sleeve 8, is jetted toward the outside of the outer tube 2 through the discharge port 6, and then injected into the ground. In short, the flow path is changed from the lower discharge port 5 to the upper discharge port 6. |
