Penetration ring extrusion device null of subterranean junction die shielded

摘要

PURPOSE:To make it possible to equalize a stroke amount of each of extruding jacks by constituting an underground connection type shield machine indentation ring extruder of the extruding jacks having one end mounted to an indentation ring and a hydraulic mechanism supplying an equal amount of pressure oil to each of the extruding jacks. CONSTITUTION:Each extruding jack 17 is such that a cylinder bottom 17a as one end thereof is connected to the rear end of an indentation ring 13 with a pin and that a rod head as the other end is fixed to the inside of a shield machine, and the indentation ring 13 is so formed that it is capable of moving back and forth along an axis of a shield machine 1. A hydraulic mechanism supplying an equal amount of pressure oil to extruding jacks 17 and 17 is provided to the shield machine 1. According to the constitution, in any case, the indentation ring can be pushed out in parallel with the axis of the shield machine, and an intrusive ring extruding process can be surely carried out.