| 摘要 |
PROBLEM TO BE SOLVED: To form water proof pan in which total lateral widths differ at every 0.5 module up to 2.5-6.0 module with the provision of minimum kinds of unit pans only while preventing interference of flow of water in a drainage groove formed at a front edge of connected unit pans and preventing accumuration of dust at the connection part. SOLUTION: A piece 93 is filled in a connection recess of drainage grooves 2f, 2d formed at a front edge of connected unit pans Pf, Pd, and an upper surface of the piece 93 is made flush with a bottom surface of an end of the groove 2f, 2d. Totally 8 kinds of end unit pans, whose lateral widths are 1.0 module or 1.5 module and depths of drainage groove differ, and intermediate unit pans are provided. Two - four of the unit pans are selected therefrom and connected to form water proof pans that differ at every 0.5 module up to 2.5-6.0 module.
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