METHOD FOR REINFORCING INNER LINING OF TUNNEL

摘要

PROBLEM TO BE SOLVED: To provide a method for reinforcing an inner lining of a tunnel capable of supporting a reinforcement member on the inner peripheral surface of an existing tunnel without impairing the water barrier effect by a water-impervious sheet.SOLUTION: A method for reinforcing an inner lining of a tunnel includes the steps of: mounting a water-impervious sheet 3 on an inner peripheral surface 2a of an existing tunnel 2; supporting a reinforcement member 4 on the inner peripheral surface 2a of the existing tunnel 2 so that the reinforcement members 4 are installed along the inner peripheral surface 2a of the existing tunnel on the inside of the existing tunnel 2; installing a form device 6 on the inside of the reinforcement members 4; and backfilling between the form device 6 and the water-impervious sheet 3 with a filler 7. The reinforcement member 4 is supported on the inner peripheral surface 2a of the existing tunnel 2 by pressing a support part 50 of a reinforcement member supporting device 5 for supporting the reinforcement member 4 on the inner peripheral surface 2a of the existing tunnel 2 against the inner peripheral surface 2a of the existing tunnel 2 via the water-impervious sheet 3.