JACKING FORCE-UNIFORM DISTRIBUTION JACKING-DISK, FOR UNIFORMLY APPLYING JACKING FORCE TO ALL JACKING MEMBERS

摘要

PURPOSE: A jacking force-uniform distribution jacking-disk is provided to make the completely same jacking force automatically applied to all jacking members of a group arranged to a passage or a duct. CONSTITUTION: In a jacking force-uniform distribution jacking-disk, center hole cylinders(51,52) and pistons(53) of a group are formed to each of plural jacking members(12). Fluid movement passages(54) for movement of a fluid are installed between the cylinders. The same pushing-out force is applied to each center hole piston and the same jacking force is applied to all the jacking members.