GROUT REINJECTION METHOD TO GROUT UNFILLED CAVITY PART IN SHEATH FOR PC TENDON INSERTION

摘要

PROBLEM TO BE SOLVED: To provide a device which enables easy grout reinjection at low pressure and repressurization after the injection, in grout reinjection to a grout unfilled cavity part.;SOLUTION: When grout is reinjected to a grout unfilled cavity part 14 having air permeability on the upper end side of a PC tendon insertion sheath in an existing PC structure, a hole 20 for grout reinjection is formed on the lower end of the grout unfilled cavity part 14, a hole 30 for grout pressure measurement in the cavity part is formed at a position higher than the lower end, a pressure gauge 32 for measuring a grout pressure at a height position of the hole for grout pressure measurement is installed on the hole 20 for the grout pressure measurement in the cavity part, and a repressurization force by a grout reinjection pump 34 is imparted until an injected grout 35 for reinjection is cured after the grout 35 for reinjection is injected up to the upper end of the grout unfilled cavity part 14 so that a measurement value by the pressure gauge 32 is kept at a value in a state where the grout unfilled cavity part 14 is filled with the grout 35 for reinjection up to the upper end thereof.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2018,JPO&INPIT