Through the molding box (20) in wife stopping manner

摘要

PROBLEM TO BE SOLVED: To improve the gable stop operation efficiency of a form with simple structure. SOLUTION: In a process for placing concrete 18 for lining into a tunnel 16 via a form 20, each gable frame 28 that is arranged at the periphery of the gable side of the form 20 so that it can be elevated and inclined freely and is provided a contacting part 26 corresponding to a tunnel inner wall surface 14 on a surface is guided into a guide 30 that is arranged at the form 20 for supporting and is raised to the side of the wall surface in the tunnel, the contacting part 26 is brought into contact with a wall surface 14 in the tunnel, a blocking plate 36 is allowed to interfere with the space part being formed between the raised gable frames 28, and the space part is blocked, thus preventing the concrete 18 that is placed in the form 20 from being leaked.