FIRE-RESISTANT COATING STRUCTURE OF DUCT PENETRATION PART OF STEEL BEAM

摘要

PROBLEM TO BE SOLVED: To provide a fire-resistant coating structure of a duct penetration part of a steel beam capable of reducing the size of the inner diameter in a duct penetration hole formed in a steel beam.

SOLUTION: In a fire-resistant coating structure 1A of a duct penetration part of a steel beam in which a duct having a fireproof covering material 2 wound around the outer peripheral surface 3a is inserted in a duct penetration hole 6 formed in a web 5 of a steel beam 4, the thickness dimension of a part of the fireproof covering material 2 which is at least arranged between the inner peripheral surface 6a of the duct penetration hole 6 and the outer peripheral surface 3a of the duct 3 is smaller than the thickness dimensions of the other parts.

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