JP2004084294A - Confluent special joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a confluent special joint capable of enhancing drainage performance by stably creating a core of air within a waste stack while preventing entrainment of air from the core on the surface of a swirling down stream, and imparting a required minimum amount of swirls while avoiding formation of bubbles. <P>SOLUTION: The confluent special joint 1 connects a horizontally laid branch pipe to a waste stack laid in the vertical direction of a multilayered building. The joint has an enlarged part 4 in the form of a tube with an increased diameter and having at its top an opening 2 for connecting the waste stack, and has a constricted neck part 5 formed downwards from the lower edge of the enlarged part and having an opening 3 for connecting the waste stack. A swirl vane 7 with a total inclination angle θ of not less than 5° but less than 10° is provided on the pipe wall of the constricted neck part 5 on the inner surface of a confluent joint pipe 1 in order to impart swirls to falling wastewater. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a merging joint for connecting a horizontal branch pipe arranged in a horizontal direction to a drainage stack pipe arranged in a vertical direction of a multi-story building, and a swivel flow velocity (circumferential direction) of the draining water flowing down. The present invention relates to a merged joint (= merged special joint) capable of improving the drainage performance by minimizing the entrainment of air by setting the speed in an appropriate range to a speed within an appropriate range, and a single-pipe drainage system using the same.
[0002]
[Prior art]
For drainage of a multi-story building or the like, a two-pipe drainage apparatus provided with a drainage pipe and a ventilation pipe in parallel with the drainage pipe, and a single-pipe type drainage apparatus which performs drainage and ventilation with the same pipe are known.
If the two-tube type is adopted, the trap can be almost certainly prevented from being breached, but this adds to the piping cost of the ventilation pipe, and also requires securing space for piping the ventilation pipe, As a result, there is a problem that construction costs rise.
On the other hand, a single-pipe drainage device is composed of a drainage stack pipe vertically penetrating each story and a horizontal branch for piping along the floor of each story and supplying drainage to the story to this. There is a pipe, and at the intersection with the horizontal branch pipe, these connections are usually made using a special joint with a built-in swirl blade in order to impart swirl flow to the drainage flowing down. Drainage and air that normally flow down mix and flow down, so that the upper floor of the vertical stack has negative pressure and the lower floor has positive pressure.
[0003]
This is because when a large amount of drainage water flows down the drainpipe at a stretch, air is sucked or negative pressure occurs on the upstream side of the drainage due to other factors, and toilets and bathrooms connected to the horizontal branch pipe affected by this negative pressure In a kitchen or the like, the trap may be opened.
On the other hand, on the downstream side of the drainage, where the drainage flow goes, a temporary blockage phenomenon occurs in the drainage stack, which causes a positive pressure. In a toilet, a bathroom, a kitchen, or the like, the trap may be opened in the opposite direction to the above, and may cause splashing, drainage noise (burring noise), generation of offensive odor, and the like.
[0004]
Therefore, conventionally, in order to solve these problems in the single-pipe drainage device, in order to solve the above-mentioned confluence special joint, the swirling vanes are protruded inward from the inner wall of the reduced diameter portion of the confluence special joint. A swirl flow is generated along the inner surface of the vertical stack below the junction special joint, thereby pushing downflow drainage against the drain stack wall to form an air core at the center of the drain stack, and Variations have been suppressed.
For example, with respect to this, there are many proposals such as Japanese Patent Publication No. 5-38195, Japanese Patent Application Laid-Open No. H8-58989, Japanese Patent Application Laid-Open No. 9-310389, Japanese Patent Application Laid-Open No. 2000-096664, and Japanese Patent Application Laid-Open No. 2001-182114. .
[0005]
According to the single-pipe drainage system using this special joint, the falling water given swirling flow by the swirling blades has a slower falling velocity and an air core for ventilation is formed at the center of the drain stack. In addition, the aforementioned suction force is weakened, and the positive pressure due to the piston action generated at the bottom of the drain stack is also reduced. As a result, the air pressure fluctuation of the negative pressure and the positive pressure generated inside the drain stack is suppressed small, and the same inner diameter Even if a drain stack is used, the amount of water that can be passed through without opening is increased, and the ventilation pipe can be omitted. This is a useful technique for high-rise buildings.
These conventional devices relate to a single-pipe drainage device in which drainage and ventilation are performed by a single pipe. Usually, when drainage flows down in a drainage stack, swirling is applied to the downflow drainage by a swirling blade to form a pipe. By flowing down the surface, an air core is formed at the center of the pipe, and the pressure fluctuation in the drain stack at the time of drainage flow is suppressed to an allowable value or less.
[0006]
Conventionally, the purpose of this study was to examine how to efficiently turn down the drainage water so that a large amount of drainage can flow while maintaining the pressure fluctuation in the drainage device below the tolerance value lower than the trap rupture value. In order to do so, research was conducted on how to provide swirling vanes. As a result, in order to improve the turning ability, almost all attempts have been made to increase the inclination angle of the turning blade with respect to the vertical axis (to make the angle close to horizontal).
[0007]
By increasing the angle of inclination of the swirling blade with respect to the vertical axis (an angle close to horizontal), it is possible to further improve the swirling blade's ability to impart swirling to the drainage water, but detergent is contained in the drainage water. In the case of drainage that has a high foaming property, such as when it is contained, the falling drainage violently collides with the water receiving surface of the swirling blade (collision surface of the falling water of the swirling blade), and bubbles are generated. There is a problem that the air core is eliminated, and bubbles stay in the horizontal branch pipe, and the bubbles block the ventilation portion, thereby increasing the pressure in the pipe. It is obvious that the generation of bubbles due to the collision increases as the inclination angle of the swirling blade is increased (closer to the horizontal).
[0008]
In addition, in order to increase the inclination angle of the swirl blade (to make the angle close to horizontal), the enlarged-diameter annular portion on the upper part of the special joint joins the swirl blade provided on the lower reduced-diameter tube wall to increase the water receiving surface. To increase the diameter of the drainpipe, it is necessary to secure a large diameter in order to avoid blockage due to solid matter or the like. As a result, despite the elimination of the ventilation pipe and the use of a single pipe, the saving of installation space has been greatly reduced.
[0009]
For this reason, in wastewater containing detergents, etc., the air core is liable to be clogged due to the foaming, and in order to prevent this, the inclination angle of the swirl vanes with respect to the vertical axis while maintaining the ability to impart swirl of flowing water. A proposal has been made to make it steeper (closer to vertical) (JP-A-2001-182114).
However, even in this case, the collision between the flowing water and the water receiving surface is only eased by making the water receiving surface steep and providing a directing means for directing the drainage flow on the water receiving surface toward the base of the water receiving surface. We did not consider reducing the swirling flow velocity while maintaining the ability to impart swirling force, and even if the bubbling caused by the collision of the swirling blades of the falling water with the water receiving surface could be prevented, the swirling inside the drain stack was performed. The entrapment of air at the draining surface that has been flowing down has not been resolved.
[0010]
As described above, the swirl flow velocity of the drainage water in the general single-pipe drainage system is higher than that required for securing the air core inside the drain stack, and therefore, the excessive swirl flow velocity is A special joint that merges air from the air core into the surface of the swirling water flowing down the vertical pipe, destabilizes the formation of the air core, and conversely fails to exert its effect sufficiently and gives the optimum swirling flow velocity Was not considered.
[0011]
[Problems to be solved by the invention]
The present invention makes it necessary to stably form an air core in a drainpipe while avoiding entrainment of air from an air core on the surface of a swirling water flow, and to suppress the generation of bubbles even when a foaming substance such as a detergent is contained. It is an object of the present invention to provide a joint special joint that can enhance drainage performance while giving a minimum swirling flow.
[0012]
[Means for Solving the Problems]
The present invention
[1] A merging joint for connecting a horizontal branch pipe arranged in a horizontal direction to a drainage stack pipe arranged in a vertical direction of a multi-story building, and having a drain stack connection opening at an upper portion. An enlarged-diameter tubular enlarged portion, and a reduced-diameter portion formed downward from the lower edge of the enlarged portion and having a drainage-pipe connection opening; A special joint where a swirl vane having an inclination angle θ of 5 ° or more and less than 10 ° with respect to the vertical axis is provided with respect to the vertical axis to impart a swirl flow to the vertical axis.
[2] The special joint according to [1], wherein the enlarged diameter of the enlarged part of the merged joint pipe is a merged joint pipe whose diameter is expanded within a range of 20 to 50 mm with respect to the inner diameter of the drainage stack.
[3] The special joint according to the above [1] or [2], wherein the joint blade is provided with an R (concave curved surface) of 5 to 10 mm at the time of providing the swirl vane to the merge joint pipe.
[4] The above-mentioned object is achieved by developing a single-pipe drainage system characterized by using the special joint according to any one of [1] to [3] above in a drainage device for a multi-story building. Was achieved.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
In the present invention, a multi-storey building is a middle- or high-rise building having at least three floors or more, and is used for draining domestic wastewater and other wastewater from toilets, bathrooms, kitchens and the like that may be provided for each floor. It is equipped with a drainage piping device connected to a joint (merging special joint) for collecting this by horizontal branch pipes provided for each floor and joining it to a vertical drainage stack. Means a building.
[0014]
The joining joint (joining special joint) 1 is essentially the same as the conventional joining special joint, and as shown in FIG. 1, an upper opening 2 for connecting a drain stack and a lower part for connecting a drain stack as shown in FIG. An opening 3 and an intermediate portion thereof, an enlarged tubular section 4 having one to four lateral branch connection openings 6 on the upper side surface, and a reduced diameter section 5 at the lower portion. Are provided with turning blades 7 on the inner wall surface. If the horizontal branch pipe protection wall 8 is provided so as to cover a part of the upper part of the horizontal branch connection opening from the drain stack connection upper opening 2, if there is much drainage flowing down from the drain stack, Even so, it is preferable because it can prevent the lateral branch pipe from being blocked by the protective wall.
The turning blade 7 in the present invention is essentially different from the conventional special joint in that the angle of inclination of the entire blade is set to 5 ° or more and less than 10 ° with respect to the vertical axis.
[0015]
The swirling flow speed of the flowing down water in the present invention may be as low as possible as long as an air core can be formed at the center of the drainage stack, and conversely, consideration should be given not to have a further swirling flow speed. For this purpose, it is necessary that the angle of inclination of the swirling blade is even smaller than 10 ° to 30 °, which is the smallest angle of inclination conventionally proposed. In addition, it is a proposal that the inclination angle is at least 10 °, but in reality, no use example could be found if the inclination angle was about 20 ° or less. Even when the swirling flow speed is reduced in this way, the drainage flowing through the pipe wall of the drainage stack forms an air core, has a smooth surface, has little bubbling, and rarely entraps air from the air core into the swirling flow. It is.
[0016]
In order to set the swirling flow speed to an appropriate speed as described above, it can be achieved by setting the inclination angle θ of the swirling blade to 5 ° or more and less than 10 °. Furthermore, in order to make the swirling drain flow collide well with the falling drainage from the upper floor and minimize the amount of air entrapment, there is an optimum range between the special joint inner diameter and the swirling blade inclination angle. The effect is reduced even if the diameter of the enlarged tubular enlarged portion is made too large relative to the inner diameter of the drainage stack. The angle of inclination can be achieved by expanding the diameter of the expanded tubular enlarged portion in the range of 20 to 50 mm, preferably 35 to 50 mm with respect to the drainage stack. As a result, it is possible to reduce the size of the enlarged portion of the enlarged diameter pipe as compared with the conventional special joint. It is preferable to reduce the diameter of the expanded tubular enlarged portion because the installation space can be reduced.
[0017]
As a result, the drainage swirling and flowing down flows relatively smoothly, so that bubbling can be minimized, and the entrainment of air on the swirling water flow surface is greatly suppressed.
Even if the angle of inclination is further reduced, the joint of the base for attaching the swirling vane to the inner wall of the reduced diameter portion has an R (concave curved surface) of 5 to 15 mm, so that it is possible to smoothly flow the drainage flowing down, and to expand. Even if the diameter of the radially enlarged tube is reduced, a space between the swirling blade and the pipe wall can be secured.
[0018]
[Example]
As a drainage load device for a constant flow drainage load system, a method using a high-place water tank and a top-ventilated pipe according to HASS 218-1999 [Drainage Capacity Test Method for Drainage Stack System of Apartment Houses] The standard vertical distance of the drain horizontal branch pipe of each floor of the tenth floor is 3.2 m, and the vertical distance between the bottom horizontal drain pipe and the horizontal drain main pipe is 0.5 m (type B). A standing-tube system was used. The diameter of the drainage stack was VP75A, the drain horizontal main pipe was 100 mmφ, the slope was 1/100, and the length was 5 m. In addition, drainage can be made to flow from the elevated water layer to each floor via a flow meter.
The drainage horizontal branch pipe on each floor has an inner diameter of 120 mm (body diameter of 120 mm), and a reduced diameter portion of 195 mm in the lower part with an angle of 8 ° and a maximum width of 45 mm (smaller downward: see FIG. 2). A special drainage joint with 193 mm long swirling vanes and a pressure sensor were provided.
[0019]
The drainage load was started from the top floor, and when the drainage flow rate on that floor exceeded 2.5 L / s, drainage was sequentially added from the lower floor. In this case, the flow rate of the drainage water was started from the flow rate in a region where the determination conditions could be satisfied, and the increment interval was 0.5 L / s. Increase the amount of drainage, read the maximum value of plus or minus of the pressure sensor installed on the drain horizontal branch pipe on each floor in a graph of drainage load and pressure, and read ± 400 Pascal (HASS 218-1999 test). When the drainage capacity at the intersection with the pressure (in-pipe pressure specified in the determination conditions) was checked, the drainage capacity was 3.8 L / s.
[0020]
[Comparative example]
For comparison, as a merging joint of each floor, an inner diameter of 120 mmφ (body diameter of 120 mm), a lower diameter portion of 195 mm length, an angle of about 20 °, and a maximum width of 45 mm (smaller downward: see FIG. 2), The same apparatus as that of the example was used except that a special drainage joint having a 193 mm long turning blade was used.
The drainage load is added in the same manner as in the embodiment, and the maximum value of plus or minus of the pressure sensor provided in the drainage horizontal branch pipe of each floor is plotted and read on the graph of the drainage load and the pressure, at the intersection with 400 Pascal. When the drainage capacity was checked, the drainage capacity was 2.8 L / s.
[0021]
【The invention's effect】
The present invention relates to a merging joint for connecting a horizontal branch pipe arranged in a horizontal direction to a drainage stack pipe arranged in a vertical direction of a multi-story building, and a swivel flow velocity (circumferential direction) of the draining water flowing down. By setting the (speed) within an appropriate range, the drainage performance can be improved.
That is, the merging joint of the present invention stably forms the air core in the drainage stack while reducing the swirling speed by making the inclination angle of the swirling blades steep, and avoiding the air from entraining the air from the air core on the surface of the downward swirling water flow. The present invention relates to a special joint for joints that can enhance drainage performance while providing a minimum necessary swirling flow even in a place containing a foaming substance such as a detergent, and a single-pipe drainage system using the same.
[Brief description of the drawings]
FIG. 1 is a schematic sectional view of a special joining joint.
FIG. 2 shows details of a base of a swirling blade mounting portion in FIG. I sectional view in FIG. 1 b. II-II sectional view in FIG. 1 c. III-III sectional view in FIG. 1 d. IV-IV sectional view in FIG.
DESCRIPTION OF SYMBOLS 1 Joint special joint 2 Upper opening for drain stack connection 3 Lower opening for drain stack connection 4 Enlarged tubular section 5 Reduced diameter section 6 Opening for horizontal branch connection 7 Swing vane 8 Protection for horizontal branch pipe Wall θ Inclination angle of swirl vane

Claims (4)

A merging joint for connecting a horizontal branch pipe piped in the horizontal direction to a drainage pipe piped in the vertical direction of a multi-story building, and having a drainage stack pipe connection opening at the top. And a reduced-diameter portion formed downward from the lower edge of the expanded portion and having a drainage stack connection opening, and having a reduced diameter pipe wall on the inner surface of the merged joint pipe and having a circumferentially extending drainage flow. A special joint having a swirl blade having an inclination angle θ of 5 ° or more and less than 10 ° with respect to the vertical axis in order to impart a swirl flow to the joint. 2. The special joint according to claim 1, wherein the enlarged diameter of the enlarged part of the merged joint pipe is a merged joint pipe whose diameter is expanded within a range of 20 to 50 mm with respect to the inner diameter of the drainage stack pipe. 3. 3. The special joint according to claim 1, wherein when the swirl vane is provided in the merge joint pipe, an R (concave curved surface) of at least 5 to 15 mm is provided at a joint thereof. 4. A drainage system for a multi-storey building, wherein the special joint according to any one of claims 1 to 3 is used.

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