PURPOSE: To provide a water stop material for a joint-opening excellent in its water stop property due to its volume change in relation to the expansion/ contraction of the interval of the joint opening more than that of a conventional one and also excellent in its follow-up property for expansion/contraction behavior.
CONSTITUTION: A water stop material for a joint-opening is such one as being used by being bonded to the mutual end surfaces 1 of the joint-opening to be arranged. As a whole, a water stop layer 3 is integrated fixingly to the upper end surface of an elastic support material 2 and further a protection layer 8 consisting of continuous bubble foam integrated fixingly to the upper end surface of the water stop layer 3 is laminated. The support material 2 is provided with a pair of independent bubble foam layers 6 for forming the surfaces bonded to the end surfaces 1 of the joint-opening and an elastic foam layer 7 integrated fixingly by being held between these independent bubble foam layers 6. The elastic foam layer 7 is formed by continuous bubble foam and also the independent bubble foam 6 is set in more elastic state than the continuous bubble foam 7. Further, the water stop layer 3 is composed of a rubber sheet shape body less elastic than a support material 2.
KASHIWABARA MASAHIKO
NITTA KK
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