To uniformize the area of the intra-frame portion of a lattice-like slope frame.

This calibrating frame 13 comprises a calibrating frame body 14 and bridging members 15 serving as reinforcing bar holding members, and the calibrating frame body 14 is provided with leg sections 17 extended along the direction perpendicular to a slope face in an arranged state on the slope face. There is little possibility that a solidifying agent 26 sprayed to the calibrating frame body 14 is protruded to the side at the lower end sections of the leg sections 17, and the area of the intra-frame portion can be unified. A pair of circular arc sections 18 are provided on both sides in the width direction of the calibrating frame body 14. When two calibrating frame bodies 14 are arranged on each side of lattice-like reinforcing bars 12, the circular arc sections 18 of eight calibrating frame bodies 14 are connected together to form a circular border line, thereby the intra-frame shape of the lattice-like slope frame can be easily made circular.