Flowing-down rainwater flow-separating pipe

Details Flowing-down rainwater flow-separating pipe Flowing-down rainwater flow-separating pipe

1996-04-11

1997-10-28

Upton, Christopher

Liquid purification or separation

Structural installation

Flume stream type

210162, 210170, 210172, 52 16, E03B 303, E03F 100

Patent

active

056814550

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to a flow-separating pipe for flow-separating rainwater dropping on a roof or a housetop of a building into the rainwater flowing into a sewer pipe and the rainwater stored in a storage-percolating box or a storage vessel.


BACKGROUND ART

As such a rainwater flow-separating pipe, one of the inventors filed a patent application relating to a flowing-down rainwater flow-separating pipe comprising an outer pipe and an inner pipe disposed in the outer pipe (Unexamined Published Japanese Patent Application No. 64-83738). A vertical potion is formed on the outer pipe, and an upper end of the outer pipe is connected to a gutter. A lower end of the outer pipe is connected to a water collecting box communicating with the sewer pipe. An outer circumferential edge of an upper end of the inner pipe is arranged apart from an inner circumferential surface of the vertical portion at a predetermined distance. A lower end of the inner pipe is connected to a rainwater storage-percolating box. In this flow-separating pipe, an inner diameter of one part of the vertical portion of the outer pipe is formed so as to change continuously, and an upper portion of the inner pipe is positioned movably in the vertical direction, so that the above-mentioned distance is adjusted. An opening potion is disposed on the outer pipe in the vicinity of the upper end of the inner end. An opening and closing lid is disposed on the opening portion.
In this flow-separating pipe, the rainwater flowing-down from the gutter flows down in a laminate manner while it adheres to an inner circumferential surface of the vertical portion of the outer pipe. On the light rain and the middle rain in which the strength of the raining (mm/hour) does not exceed the flowing capacity of the sewer pipe and the rivers, a thickness of the layer of the rainwater flowing down on the inner circumferential surface of the vertical portion is less than a distance between the outer circumferential edge of the upper end of the inner pipe and the inner circumferential surface of the vertical portion, so that the rainwater flows down only in the outer pipe to flow to the sewer pipe through the water collecting box, and does not flow into the inner pipe.
On the heavy rain in which the strength of the raining exceeds the flowing capacity of the sewer pipe and the like, the thickness of the layer of the rainwater flowing on the inner circumferential surface of the vertical portion become larger than the above-mentioned distance, so that the rainwater flows into the inner pipe also. The rainwater flowing into the storage-percolating box is temporarily stored in this box, and then percolates into the earth to be dispersed thereto.
As a result, only when the strength of the raining exceeds the flowing capacity of the sewer pipe and the rivers, the rainwater from the gutter can be flow-separated into the storage-percolating box, and the device can be made into a simple construction to be arranged in a small space in the gutter, and the sand and the micro dust which enter into the rainwater from the gutter can be removed to prevent the blinding of the storage-percolating box.
However, the gutter for the roof having an area of, for example, 50 m.sup.2 has been actually connected to the outer pipe of the above-mentioned flowing-down rainwater flow-separating pipe, a speed and a thickness of the flow of the rainwater has been measured when it rains on the roof at the strength of the raining of about 10 mm/hour. As a result, the flow speed of the rainwater has been about 2 to 3 m/sec. The thickness of the layer of the rainwater flowing down while adhering to the inner circumferential surface of the outer pipe has been about 0.5 mm. Therefore, it is difficult to flow-separate the flow of the rainwater adhering to the inner circumferential surface of the outer pipe, since the thickness of the layer of the rainwater is small.
It is an object of the present invention to provide a flowing-down rainwater flow-separating pipe in which the blinding

REFERENCES:
patent: 2494780 (1950-01-01), Schmidt
patent: 4578188 (1986-03-01), Cousino
patent: 4801377 (1989-01-01), Bolt
patent: 5114594 (1992-05-01), Rosebrock et al.
patent: 5452546 (1995-09-01), Goddard

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