| 摘要 |
PROBLEM TO BE SOLVED: To develop the structure of a built-in gutter capable of assembling a factory-made built-in gutter at a site without causing any leak even if there is heat contraction in a difference between heat and cold. SOLUTION: In the built-in gutter of a roof formed to the inside from the edge of gutter, a receiving gutter body 10 separately formed in the shape of a box with an opened upper surface capable of storing rain water is continuously provided along a built-in gutter recess section, a joint section 20 having a U-shaped section with width size capable of absorbing heat contraction of the receiving gutter body occurring in a difference between heat and cold is provided from the upper side across between both receiving gutter bodies 10 adjacent to each other, and the built-in butter is so constituted that a drain 30 leading rain water stored in part of the receiving gutter body in the ground is additionally provided.
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