Importance

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Abstract

An upper end of an outer pipe 16 is connected to a gutter, and a lower end of the outer pipe is connected to a water collecting box communicating with a sewer pipe. An inner pipe 18 which is arranged apart from an inner circumferential surface of a vertical portion 16d of the outer pipe at an outer circumferential edge of an upper portion thereof is connected to a storage-percolating box at a lower end thereof. A ring-like flow-separating piece 24 is disposed on an inner circumferential surface of the vertical portion of the outer pipe above an outer end of the inner pipe by a predetermined distance. The flow-separating piece comprises a ring-like concave groove 24a for receiving rainwater flowing down along the inner circumferential surface of the vertical portion of the outer pipe, a plurality of through holes 24b formed on a bottom portion of the concave groove so as to be juxtaposed in a circumferential direction for guiding the rainwater received in the concave groove to the water collecting box, and an inner circumferential wall 24c formed in such a taper as that an inner diameter thereof decreases toward the lower end for guiding the rainwater overflowing from the concave groove to the inner pipe.

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First Claim