Subterranean junction device and subterranean junction construction method null of shielded

摘要

PURPOSE:To raise the durability a shield tunnel by a method in which a penetrating ring is housed in the space between the inner and outer cylinders of the double structure tip of the skin plate in a shield excavator, a penetration chamber is formed in the other shield machine, and a reinforcing ring is provided to the cutter. CONSTITUTION:Excavation is made by the cutters 17 of sporks 31,... for the insides of the inner cylinders 9, 23 of tunnel by means of shield excavators 28, 29. The outside of the excavated portion is excavated by the cutters 35,... of the reinforcing ring 34 and by the cutters 17,... of the sporks 32,... reinforced by reinforcing rings 34. When tunnel connecting parts are approached, the sporks 32,... are removed, the rings 34 are left behind, and the sporks 32,... are shortened beyond the radius of the inner cylinders 9, 23. The penetrating ring 10 of the shield machine 28 is moved to cover the ground Gj, and the shield machines 28, 29 are disassembled to excavate the ground of the connecting point. The tunnel can thus be excavated over long distance.