| 摘要 |
PURPOSE: A method for direct boring and grouting using a duplicate pipe is provided to streamline processes and reduce material costs by not needing separate rods. CONSTITUTION: A method for direct boring and grouting using a duplicate pipe comprises following steps. An outer tube(104) with a grout material outlet and an inner tube(202) having smaller diameter than that of the outer tube are coupled a work puncture bit(102). A rod having smaller diameter than that of the inner tube is inserted into the inner tube to be coupled with the work puncture bit. The power is transmitted to the rod, thereby punching the ground. The rod is removed. An inner tube cap(204) is covered on one side between both sides of the inner tube which is not coupled with the work puncture bit. Grout material is injected into a space between the inner circumference of the outer tube and the outer circumference of the inner tube. |
