It can be realized by the [problem] simple and inexpensive structure, to provide a bag-shaped dam of the exchange easy tunnel Sentoru The invention relates to a bag-like dam member for closing the filling space formed between the outer and the tunnel inner wall surface of the mold tunnel Sentoru, the hose member 1 having a predetermined length, the hose a closure member 2 for sealing the end opening of the body 1, a plug member which is exposed on the surface of the hose body 1 and can be connected to the supply pipe of the inflation fluid and having a passage communicating with the interior of the hose body 1 equipped with a 3 andFIELD 1
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