| 摘要 |
PURPOSE:To prevent the lowering of strenth or the leak of water in the joints of underground continuous wall by a methd in which a high-pressure water jetting rod is inserted into a locking box fitted with the end face of a preceding element and water jet is jetted from the rod to remove slime. CONSTITUTION:An underwater concrete is placed in a preceding element 1, a locking box 9 is inserted into the concrete, and a high-pressure water jetting rod is inserted into an annular metal 11. While jetting high-pressure water in the horizontal direction from the tip of the rod, the rod is turned to clean up slime adhered to bent steel plates 4 and coupling steel bars 5 in the joint portion. The slime so removed is flowed through the notched portion of the lower end of the box 9 into the following excavated trench and then discharged through a tremie tube to the ground's surface. The box 9 and the rod are pulled up, an iron bar cage is inserted, and then underwater concrete is placed. |
