JPH0198274U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is a schematic sectional view of a double standpipe system according to one embodiment of this invention, Fig. 2 is an enlarged sectional view of the same main part, Fig. 3 is a sectional view taken along the line - - of Fig. 2, and Fig. 4 is a cross-sectional view taken along the line - - in Fig. 3, Fig. 5 is a cross-sectional view taken along the line - - in Fig. 3, Fig. 6 is a sectional view of main parts according to another embodiment, and Fig. 7 shows a conventional two-layer pipe joint. FIG. In the figure, 10 and 11 are drainage standpipes, 12 is an upstream inner pipe, 12a is a downstream inner pipe, 13 is an outer pipe, 1
4 is a two-layer pipe joint, 15 is an inner joint pipe, 16 is an outer joint pipe, 20 is a branch pipe, 21 is a drainage horizontal branch pipe, A is a drainage route, and B is a ventilation route.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A drainage stand constructed of a double pipe consisting of an inner pipe that serves as a drainage route inside the pipe, and an outer pipe that forms a ventilation route between the outer peripheral surface of the inner pipe. In a two-layer pipe joint that connects the upstream and downstream sides of a pipe and connects a drainage horizontal branch pipe to the drainage standpipe at the connection part, the upstream inner pipe and the downstream inner pipe of the drainage standpipe are connected. a joint inner pipe, a joint outer pipe that connects the upstream outer pipe and the downstream outer pipe of the drainage standpipe to form upstream and downstream standpipe air passages between the joint inner pipe; an opening integrally connected to the joint inner pipe along the inner circumferential surface line direction thereof, and protruding outward through the joint outer pipe;
a branch pipe for connecting the drainage horizontal branch pipe to which the drainage horizontal branch pipe is connected to cause the drainage water from the drainage horizontal branch pipe to flow swirlingly within the joint inner pipe; A two-layer pipe joint characterized by having a vertically long circular or egg-shaped connecting side. (2) The joint inner pipe is wider than the upstream joint opening to which the upstream inner pipe is connected and the downstream joint opening to which the downstream inner pipe to which the downstream inner pipe is connected is connected. It is formed of a peripheral wall with a large diameter and has a main pipe part that gradually tapers toward the downstream joint opening, and the above-mentioned vertically oval circular or vertically oval branch pipe is connected to this main pipe part. A two-layer pipe joint according to claim 1, characterized in that it is a utility model. (3) The connection side of the drainage horizontal branch pipe in the branch pipe is formed in a perfect circular shape, and the drainage horizontal branch pipe made of a normal circular pipe is connected to the circular pipe section. A two-layer pipe joint according to claim 1 or 2 of the utility model registration claim. (4) Utility model registration claims 1 to 3, characterized in that the branch pipe is made of a hard vinyl chloride-lined steel pipe in which an inner vinyl pipe is integrally bonded to the inner peripheral surface of an outer steel pipe. The double-layer pipe joint according to any one of the items above.