SUPPLY METHOD OF HEAVY LIQUID IN REGENERATION OF SUPERANNUATED PIPE

PROBLEM TO BE SOLVED: To provide a supply method of heavy liquid in regeneration of a worn out pipe, whereby in order to give buoyancy to a new construction pipe, an optimum level of the heavy liquid can be always maintained inside the worn out pipe. SOLUTION: A new construction pipe p2 closing a tip end is used, in a tail end of the new construction pipe p2, a plug 1 is mounted, water is sealed inside the new construction pipe p2, seal water 2 is pressurized from the tail end, to be inserted into a worn out pipe p1. Here, in the tip end of the new construction pipe p2, a movable block member 4 is positioned, and in a space between the new construction pipe p2 and the worn out pipe p1, heavy liquid 3 of large specific gravity is injected. A pressure of this heavy liquid 3 is detected by a sensor 5, when a detection value therein is decreased less than a preset value, a heavy liquid supply pump 7 is operated.