| 摘要 |
PROBLEM TO BE SOLVED: To provide a hollow chamber cutting/off jig in a hollow structure capable of easily inserting a foamable base material into the gap between a pair of support plates without forcibly expanding a pair of the support plates and capable of preventing the pull-off of the foamable base material. SOLUTION: A holder member 20 and a foamable base material 11 foamed by external heating to become foam to cut off a hollow chamber are provided. The holder member 20 is provided in the direction right-angled to the longitudinal direction of a hollow chamber and has a pair of support plates supporting both surfaces of the foamable base material 11 to prescribe the foaming direction of the foamable base material 11. At least one of support plates is provided with pull-off preventing pieces 24. The elastic pull-off preventing pieces 24 are elastically deformed by the insertion of the foamable basic material and, by the elastic force based on this elastic deformation, the foamable base material 11 is held between a pair of the support plates by the elastic force based on the elastic deformation.
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