JP3422460B2 - Leg vent - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leg vent used for a drainage pipe structure used, for example, in a middle-high-rise housing complex.

[0002]

2. Description of the Related Art As drainage pipes, a single pipe type that discharges all wastewater such as flush toilet, kitchen drainage, laundry drainage, bathroom drainage, etc. in the same vertical pipe, There is a two-pipe type that separates from a small amount of laundry drainage, etc. with two vertical pipes, and in either type, a pipe containing wastewater containing detergent is used as a detergent on the drainage surface in the horizontal main pipe. When foam is generated, a foam plug phenomenon may occur that blocks the space above the drainage surface. Therefore, in the prior art, a ventilation pipe is used to connect the upstream side and the downstream side of the foam plug generation portion of the horizontal main pipe so that ventilation can be ensured even if bubbles are generated (Japanese Patent Publication No. 8-2.
No. 6564, first prior art), a midway portion of a horizontal main pipe is formed with a diameter larger than that of a leg vent, and a pipe center is displaced below the leg vent so that air is formed above a bubble layer in the horizontal main pipe. Those that form a flow passage (Japanese Patent Publication No. 58-1453)
No. 2, gazette, second prior art), and leg vents in which the cross-sectional area is gradually increased from the main pipe side to the horizontal main pipe side (third prior art).

[0003]

In the first prior art, since the ventilation pipe and its connecting process are required, the construction cost is high, and moreover, the space for arranging the ventilation pipe is required above the horizontal main pipe. , The position of the horizontal main pipe must be lowered. In the second conventional technique, the middle part of the lateral main pipe is obese and is displaced below the leg vent. Therefore, a pipe with a very special shape must be manufactured, and drainage from the leg vent is required. Since there is a step in the flow of the air flow, bubbles are often generated, making it difficult to form the air flow passage in a sufficient size.Moreover, the pipe center of the horizontal main pipe is more centered than the pipe center of the bent part of the leg vent. Since it is located in the lower part, it is difficult to place it if the pocket inside the ceiling is narrow.

Further, in the third prior art, since the pipe center of the bent portion of the leg vent and the pipe center of the lateral main pipe are the same,
The dimension from the pipe center to the lower end of the bend is relatively large,
If the pocket in the ceiling is small, it may be difficult to place. The present invention solves the above-mentioned problems of the related art by preventing the occurrence of a foam plug only by displacing the pipe center of the lateral main pipe connecting portion of the leg vent to an upper position with respect to the pipe center of the bending portion. Moreover, it is an object of the present invention to provide a leg vent in which the dimension from the pipe center of the bent portion to the lower portion of the horizontal main pipe can be made relatively small and can be arranged even if the pocket in the ceiling is narrow.

[0005]

A first concrete means for solving the problems in the present invention is drainage inserted through a slab.
Of the ceiling plate connected to the bottom of the collecting pipe and below the slur
At the leg vent connected to the upper horizontal pipe
Te, and the inner diameter is displaced to the upper with respect to bending of the tube around the tube center transverse main connection portion is larger in diameter than the inner diameter of the curved portion
The distance from the lower surface of the slab to the lower part of the horizontal main pipe is shortened . As a result, even if the wastewater flowing from the leg vent to the horizontal main pipe forms a detergent foam layer, the air flow passage is formed at a position above the detergent foam layer in the horizontal main pipe and higher than the pipe inner peripheral surface of the leg vent. In addition, the dimension from the tube center of the bent portion to the lower portion of the horizontal main tube is relatively small.

A second concrete means for solving the problems in the present invention is, in addition to the first concrete means, a bias to the upper rank.
The dimension set is that the radius difference between the inner diameter of the bent portion and the inner diameter of the horizontal main pipe connected to the horizontal main pipe connecting portion is set . As a result, the flow of the drainage from the leg vents to the horizontal main pipe becomes a smooth flow without steps, the generation of bubbles occurs, and the air flow passage above the detergent foam layer is formed more reliably and larger.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 illustrates a one-pipe type piping structure, and a drainage vertical pipe 2 for flowing drainage from each floor of the building downward.
Is connected to a drainage collecting pipe 3, a horizontal branch pipe 4 is connected to the drainage collecting pipe 3, and drainage from a toilet bowl, a sink, a washroom, etc. is connected to the drainage collecting pipe 3 through a leg vent 5 at the bottom of the drainage collecting pipe 3. The main pipe 6 is connected, and the drainage collecting pipe 3 is formed such that the lower part of the body is tapered downward and is inserted into a through hole formed in the slab 7 and fixed by a mortar 8.

In a building where the first floor is a parking lot or a multi-purpose floor, etc., the leg vents 5 and 5 are provided in the pocket between the slab 7 forming the second floor and the ceiling plate 13 forming the ceiling of the first floor. The horizontal main pipe 6 and the like are arranged. 1 to 4, the leg vents 5 forming the leg joint have a double-receiving structure, and a collecting pipe connecting portion 5 that is fitted and connected to a lower portion of the drainage collecting pipe 3 on an upper side thereof.
A has a horizontal main pipe connecting portion 5B which is fitted and connected to the horizontal main pipe 6 on the lower side, and has a collecting pipe connecting portion 5A and a horizontal main pipe connecting portion 5B.
There is a curved portion 5C between and.

An inspection port 9 also serving as a cleaning window is formed at a facing position in the vicinity of the collecting pipe connecting portion 5A of the bent portion 5C of the leg vent 5, and the inspection port 9 is formed by a blind lid 10 as shown in FIG. It can be opened and closed freely. Further, the collecting pipe connecting portion 5A
A plurality of ribs 12 that are connected to the bent portion 5C are formed on the lower side of the inner flange 11 of the, and the collecting pipe connection portion 5A and the bent portion 5C are formed.
The connecting part with is reinforced. The bent portion 5C is formed to have substantially the same overall length (uniform cross-sectional area), the inner diameter of the horizontal main pipe connecting portion 5B is larger than the inner diameter of the bent portion 5C, and the large-diameter straight pipe-shaped horizontal main pipe 6 is formed. Be inserted.

While the pipe center of the collecting pipe connecting portion 5A is substantially coincident with the pipe center a of the bent portion 5C, the pipe center b of the horizontal main pipe connecting portion 5B is deviated upward by a dimension L. Therefore, since the center of the horizontal main pipe 6 is also the same as the center b of the pipe, it is displaced to the upper side by the dimension L with respect to the center a of the pipe, and from the center a of the bent portion 5C to the horizontal main pipe connecting portion 5B. The dimension M to the lower end is extremely short. This dimension (amount of eccentricity) L is set to, for example, the radius difference between the inner diameters of the bent portion 5C and the horizontal main pipe 6, and the lower portion of the pipe inner peripheral surface of the horizontal main pipe 6 fitted in the horizontal main pipe connecting portion 5B is bent. It is substantially flush with the lower part of the inner peripheral surface of the pipe 5C, and is in a connected state without steps. Further, on the upper side, the upper space suddenly becomes large when it enters the horizontal main pipe 6 from the bent portion 5C.

By using the leg vent 5 having such a shape as a leg joint for a drain pipe, the drain water flowing from the drain vertical pipe 2 and the lateral branch pipe 4 to the drain collecting pipe 3 is discharged from the leg vent 5. Will flow into the horizontal main pipe 6 after colliding with the lower part of the pipe, and foaming of the contained detergent will occur when it collides with the leg vents 5, etc., forming a detergent foam layer on the upper side of the drainage flowing in the horizontal main pipe 6. However, the flow from the bent portion 5C to the horizontal main pipe 6 becomes a smooth state without steps, and the pipe cross-sectional area rapidly expands, so that a ventilation space above the detergent foam layer is secured, and the foam blocks the pipe. To prevent the occurrence of foam plugs.

Further, even if the drainage falling from the drainage collecting pipe 3 collides with the lower part of the leg vent 5 and a jumping phenomenon occurs, the upper part of the inner surface of the horizontal main pipe 6 is the upper part of the inner surface of the bent part 5C. Since it is positioned sufficiently higher than the above, the air layer in the horizontal main pipe 6 is not divided. Since the pipe center b of the horizontal main pipe connecting portion 5B and the pipe center of the horizontal main pipe 6 are displaced to the upper side by the dimension L with respect to the pipe center a of the curved portion 5C, the curved portion 5C and the horizontal main pipe 6 are the same. The dimension from the pipe center a to the lower portion of the horizontal main pipe connecting portion 5B is shorter than that in the case of, that is, from the lower surface of the slab 7 to the horizontal main pipe connecting portion 5B.
The dimension H up to the bottom of the
Can be placed even if the ceiling of up to 3 is narrow.

In the leg vent 5, since the level of the horizontal main pipe 6 is increased, it is possible to increase the radius of curvature of the bent portion 5C, and the bent portion 5C has a high flow velocity, so that even if the cross sectional area is small, it can be drained. There is no hindrance, it can be made lightweight and compact, and even if the size of the horizontal main pipe connecting portion 5B is changed according to the size of the horizontal main pipe 6 to be connected, it is not necessary to change the size of the bent portion 5C. Can be shared, and the manufacturing cost can be reduced. The present invention is not limited to the above-mentioned embodiment, but can be modified in various ways. For example, the leg vent 5 may be for cast iron, steel pipe, or both, and may be applied to a two-pipe type drainage pipe for laundry drainage. In addition, the horizontal main pipe connecting portion 5B may be displaced to a higher position in the state where the inner diameter of the bending portion 5C is formed to be larger toward the horizontal main pipe connecting portion 5B side, or the bending portion 5C may be bent.
It is also possible to form the cross-sectional shape of the ellipse into an elliptical shape or an oval shape other than the circular shape.

[0014]

According to the present invention as described above in detail, even waste water to form a detergent foam layer in the horizontal main pipe 6, higher than the tube circumferential surface of the upper a and leg vents 5 from the detergent foam layer It is possible to form an air flow passage at a part, reliably prevent the occurrence of a foam plug, and moreover, the dimension M from the pipe center a of the bent portion 5C to the lower end of the horizontal main pipe connecting portion 5B can be made relatively small, so that the inside of the ceiling Can be placed even if the pocket is small. In addition , the flow of drainage from the leg vent 5 to the horizontal main pipe 6 can be smoothed to reduce the generation of bubbles, and the air flow passage above the detergent foam layer can be formed more reliably and large, so that the generation of foam plugs can be further ensured. Can be prevented.

[Brief description of drawings]

FIG. 1 is an overall explanatory diagram showing a first embodiment of the present invention.

FIG. 2 is a sectional front view of a leg vent.

FIG. 3 is a view taken in the direction of arrow X in FIG.

FIG. 4 is a sectional view taken along line YY of FIG.

[Explanation of symbols]

3 drainage collecting pipe 5 leg vent 5A collecting pipe connection 5B Horizontal main pipe connection 5C bend 6 horizontal main pipe a Center of pipe at bend b Center of horizontal main pipe connection L dimension (amount of eccentricity)

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) E03C 1/12

Claims (2)

(57) [Claims] 1. At the bottom of the drainage collecting pipe inserted into the slab
Connected and arranged above the ceiling plate below said slur
In the leg vent connected to the horizontal main pipe, the pipe center of the horizontal main pipe connecting part whose inner diameter is larger than the inner diameter of the bent part is deviated to the upper side with respect to the pipe center of the bent part so that the bottom surface of the slab is
The leg vent is characterized by shortening the distance from the lower part of the horizontal main pipe . 2. The dimension displaced to the upper position is set to a radius difference between an inner diameter of a bent portion and an inner diameter of a horizontal main pipe connected to the horizontal main pipe connecting portion. Leg vents.