METHOD OF CURING TUNNEL LINING CONCRETE

PROBLEM TO BE SOLVED: To provide a method of curing tunnel lining concrete capable of easily constructing, and capable of supplying a concrete placing surface with additional water even after the construction to cure the tunnel lining concrete placed at the worksite of tunnel construction.SOLUTION: The placement of tunnel lining concrete along the length of a tunnel contains repeating a procedure comprising the steps of setting an arch center, placing the tunnel lining concrete, and removing and shifting the arch center. A bubble sheet composed of layered back films 4 for encapsulating air into projections 2 is spread over a cap film 3 with the plurality of hollow projections 2 swelling out so that the side with projections 2 faces the concrete placing surface 10 after removing the arch center, and is supported with a holder 11 constructed in the shape of an arch along the inner wall of the tunnel, and the space between the bubble sheet 1 and the concrete placing surface 10 is placed under a negative pressure into intimate contact with each other.