JP2001355260A - Drain pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the structure of a vertical drain pipe capable of protecting the sealed water in a trap at a lower cost instead of so-called a double tube type of laying down a vent tube to prevent the rupture of the trap. SOLUTION: A projection 12 for forming an area 13 where the flow of drain Wa flowing down along an inside wall is branched to prevent the drain from reaching a part of the inside wall is provided on the inside wall of a drain vertical pipe 1 at a position where the state of communication can be maintained between the inside of the lateral branch drain pipe and the inside of the vertical drain pipe 1 by positioning the opening part 2a of a lateral branch drain pipe in the area 13 where the drain does not flow.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a drain stack.

[0002]

2. Description of the Related Art Conventionally, for example, in a high-rise building such as an apartment house or a hotel or a high-rise building such as a hotel, drainage drained from a drainage device on each floor is passed through a trap and then drained under a floor. The water flows into the pipe, then flows into the drainpipe, which runs through from the basement to the top floor of the building, and flows down to the basement at one time. The water is drained to the public sewer through the main pipe. On the other hand, a top ventilation pipe is provided at the top of the drain stack as an air supply port, whereby the inside of the drain stack is communicated with the atmosphere. In the drainage system of such a high-rise building, if a large amount of drainage flows into the drainage stack at once from the horizontal branch pipe, the drainage pipe on the middle floor where there is a distance from the above-mentioned top ventilation pipe and the drainage has the highest flow rate Is not enough air supply,
Negative pressure is likely to occur in the horizontal branch pipe.

On the other hand, the wastewater that has flowed into the drain stack is
It flows down while falling naturally along the inner wall of the drainage stack. When the amount of draining water flowing down increases, the drainage flows down the entire inner wall of the pipe and flows down like a water film. As a result, the horizontal branch pipe opening into the drainage stack is closed by the water film, and the communication between the horizontal branch pipe and the drainage stack is interrupted. Then, the inside of the horizontal branch pipe that temporarily became negative pressure due to the above cause is not recovered to atmospheric pressure,
Therefore, the negative pressure in the lateral branch pipe gradually increases and finally reaches a negative pressure at which the trap cannot be maintained, and the trap is broken.

Therefore, in order to prevent this, a so-called two-pipe construction method in which ventilation pipes are connected in parallel has conventionally been adopted. That is, a ventilation pipe is provided in parallel with the drainage stack pipe, and the inside of the horizontal branch pipe is communicated with the atmosphere via the ventilation pipe. According to this, a negative pressure state does not progress in the horizontal branch pipe, and the horizontal branch pipe is always maintained in a state of being restored to the atmospheric pressure, so that the trap is reliably prevented from being broken.

[0005]

The adoption of the two-pipe system can surely prevent the trap from being breached, but this increases the cost of piping the ventilation pipe, and also requires piping of the ventilation pipe. However, there is a problem that the construction cost rises as a result of having to secure a space for the construction.

Accordingly, the present invention provides a function equivalent to that of a ventilation pipe if the opening of the drain horizontal branch pipe can be prevented from being blocked by a water film and communication between the drain horizontal branch pipe and the drain stack can be properly secured. It was made with a focus on being able to obtain
It is an object of the present invention to provide a structure of a drain stack that can surely prevent traps from being opened on each floor without incurring a rise in construction costs due to the adoption of the two-tube type.

[0007]

According to the first aspect of the present invention, the drainage flow flowing down the inner wall of the drainpipe is diverged along the inner wall and the drainage is transmitted to a part of the inner wall. A projection for forming a non-existent area is provided at a position where the opening of the drain horizontal branch pipe is located in a range where the drainage does not transmit and a communication state between the drain horizontal branch pipe and the drain stack can be maintained. It is characterized by having comprised.

According to a second aspect of the present invention, in the first aspect of the present invention, the protrusion is provided on a lid for closing an opening provided on a peripheral surface of the drain stack. According to a third aspect of the present invention, in the first aspect of the present invention, the projection is integrally formed inside a pipe joint used for connecting a drain stack. In the invention according to claim 1, the projection is
It is characterized by being integrally formed on the inner wall of the drain stack.

[0009]

According to the structure of the first aspect, the opening of the drain horizontal branch pipe is not blocked by the water film formed by flowing down the inner wall of the drain stack. The communication between the branch pipe and the air core formed at the center of the drain stack is not interrupted. For this reason, even if the inside of the drain horizontal branch pipe temporarily becomes negative pressure, it is quickly restored to the atmospheric pressure thereafter, so that the trap sealing is well protected without using the conventional ventilation pipe. In addition, the same operation as described above is achieved by the configuration according to claims 2 to 4.

[0010]

Next, an embodiment of the present invention will be described with reference to FIGS. FIG. 2 shows a simplified drainage path on a certain floor of a high-rise building such as a high-rise apartment. The drainage stack 1 as the drainage stack is
Piping is performed through each floor to the top floor, and the inside of the pipe is communicated with the atmosphere. In the figure, reference numeral 9a denotes a concrete slab that partitions the above-mentioned floor and the lower floor. Here, as shown by a portion F in the figure, the drainage W flowing down in the drainage stack 1 does not have a speed reduction mechanism such as a speed reduction guide or a ventilation adjustment guide inside the pipe joint 3, so that the water W It generally flows down (JIS type joints, public corporation type joints, etc.)
For this reason, as shown in FIG. 3 (a), the drainage water W flows down in a state where a water film Wa is stretched on the inner wall surface of the normal pipe, and an extended ventilation pipe is provided on the inner peripheral side of the water film Wa. To form an air core communicating with the atmosphere.

The drain horizontal branch pipe 2 is connected to the drain stack 1 via the pipe joint 3, and a drain end such as a toilet 7 is connected to the pipe end on the indoor side. The toilet 7 shown
Is a Western-style siphonette toilet (JIS A5207, symbol C1110) and has a trap 8 built-in.

In the middle of the drainage stack 1 and above the place where the horizontal branch pipe 2 is connected, a joint 5 with a cleaning port is interposed. FIG. 1 shows the joint 5 with a cleaning port alone. The joint with a cleaning port 5 includes a lid 10 for closing the cleaning port 6, and the lid 10 is detachably attached by a bolt 11.

The lid 10 has a projection 12 protruding into the drain stack 1 in the attached state shown in the figure. That is, as shown in FIG. 4, the lid 10 has a substantially disk shape, and a substantially flat protrusion 12 is formed on a side surface of the lid 10 which faces the inside of the drain stack 1 when it is attached. Are formed so as to project toward the center. The projection size of the projection 12 is set to, for example, about 30 mm so as to be sufficiently larger than the depth of the water film Wa formed on the inner wall. As shown, the water film Wa is surely branched right and left. Further, as shown in the drawing, the projection 12 is formed in a state of being inclined about 30 ° clockwise with respect to the direction downstream of the drainage W, that is, the direction of gravity. For this reason,
The drainage W that has flowed down along the inner wall surface of the drain stack 1 branches off and then flows down as a swirling flow.

As described above, the protrusion 12 is provided inside the drain stack 1.
Is provided in a protruding state, so that the separation diagram (c) of FIG.
As shown in FIG. 2, the drainage W flowing down the drainage stack 1 in the state of the water film Wa is branched right and left by the projections 12, so that a portion 13 where the water film Wa is not formed is formed below the projections 12. , The inner wall surface of the drain stack 1
Is formed from above the opening 2a. For this reason, the opening 2a of the horizontal branch pipe 2 is not closed by the water film Wa, so that the communication with the air core formed inside the drain stack 1 is reliably maintained. In addition, it has been confirmed by the applicant's experiment that the portion 13 where the water film Wa is not formed is generally held down to about 6 m. Therefore, the position where the protrusion 12 is arranged is determined by the opening of the horizontal branch pipe 2. As long as it is within 6 m above the portion 2a, a state where the opening 2a is not blocked by the water film Wa as described above can be realized.

The horizontal branch pipe 2 communicates with the drainage stack 1 through a water film W.
Therefore, even if a large amount of drainage flows into the drainage stack 1 from the horizontal branch pipe 1 and the inside of the horizontal branch pipe 2 temporarily becomes in a negative pressure state, the drainage is immediately performed when the flow becomes small. The communication of the upright 1 with the air core is restored, so that the inside of the lateral branch 2 returns to atmospheric pressure. If the inside of the horizontal branch pipe 2 is maintained at the atmospheric pressure, the sealing of the trap 8 is protected in a good state without breaking. As described above, since the inside of the lateral branch pipe 2 is reliably maintained at the atmospheric pressure without using the conventional ventilation pipe, the ventilation pipe becomes unnecessary, and the construction cost can be reduced.

Further, the sealing of the trap can be protected without providing a complicated speed reduction mechanism inside the drain stack, and the cost can be reduced in this respect as well. Further, since the projection 12 is provided on the removable lid 10, if the drainage stack is removed and cleaned periodically, there is no possibility that the drainage stack is clogged.

Next, a modified example of the projection 12 on the lid 10 will be described. The description of the points that do not need to be changed is omitted. Although the projection 12 exemplified above had a shape that could be called a “plate-shaped type”, the lid 20 shown in FIG. 5 had a wedge shape having a triangular cross-section with a pointed upper end and a shape to be called a “wedge-shaped type”. Are formed. The projections 21 also separate the water film Wa of the drainage W flowing down while rotating along the inner wall surface of the drainage stack 1, thereby maintaining the communication between the horizontal branch pipe 2 and the drainage stack 1 and trapping 8. Can be prevented from being opened. In addition, the lid 30 shown in FIG. 6 is provided with a projection 31 of a so-called "bulb type", and the same effect as described above can be obtained by the projection 31.

Next, FIG. 9 shows the results of an instrument drainage load experiment conducted by the present applicant. In this experiment, a drainage test tower 30 m above the ground, which is equivalent to 9 floors, was used, and the above-mentioned joints 5 with cleaning ports were interposed in the drain stack 1 at every third floor (every 10 m). A horizontal branch pipe connected to the toilet bowl of the above is plumbed, and the drainage load is the siphon jet type toilet bowl described above (apparatus average drainage flow rate qd = 2.0 l / s)
From the 9th floor, and a total of 3 toilets on the lower floor
The negative pressure in the horizontal branch pipe is measured when the joint 5 is installed and when the joint 5 is not installed when the bases are sequentially added. The joint 5 has a lid 2 having the above-mentioned “wedge-shaped” projection 21 (angle 30 ° × projection dimension 30 mm).
0 is attached.

As a result, the maximum negative pressure when a load is applied to one toilet bowl is about -76.44 Pa (about -76
7.8 mmAq), but about -13 when not installed
4.26 Pa (about -13.7 mmAq)
There was a difference of 7.82 Pa (about 5.9 mmAq). The maximum load when two toilets are loaded is about -172.48 Pa (about -17.6 mmA) when installed.
q), when not installed, about -285.18 Pa (about -2)
9.1 mmAq), a pressure difference of about 112.7 Pa (about 11.5 mmAq) is generated, and the maximum negative pressure when applying a load to three toilets is about -28 each.
7.14 Pa (about -29.3 mmAq), about -478.
24 Pa (-48.8 mmAq), and the difference was further widened. And when the joint 5 is not installed when the load of three toilet bowls is given, the limit value of about -392 Pa (-40 mmAq) at which the sealing of the trap is broken.
However, when it was installed, the negative pressure remained below the above-mentioned limit value, and the trap was still sealed.

As a result of the experiment, as described above, the protrusion 12 (or 21, 3) was formed inside the drain stack 1 as described above.
By providing 1), the rise of the negative pressure in the horizontal branch pipe 2 is surely suppressed, so that the projection 12 (or 21, 31) is formed at the drainage stack 1 at appropriate intervals with the pipe joint 5 interposed therebetween. It has been proved that the installation surely prevents the trap 8 from being opened without using the conventional ventilation pipe.

Next, in the embodiment described above, the projections 12 (21, 3) are provided on the lid 10 (20, 30) of the joint 5 with a cleaning port.
Although the configuration provided with 1) has been exemplified, the projection for branching the water film Wa is not necessarily required to be provided on the removable lid 10 (20, 30). For example, as shown in FIG. It may be configured so as to be integrally formed in the inside of 40.
The illustrated pipe joint 40 is a “wedge-shaped” near the upper part of the inside of a drainage pipe joint that has been conventionally commonly used.
Of the water film Wa flowing down the upper drainage stack is also branched by the projections 41, thereby connecting the drainage horizontal branch pipe (not shown) to the horizontal branch. A portion where the water film Wa is not formed is formed in front of the inner opening portion 42a of the pipe connection port 42, and thus, as described above, the trap can be reliably prevented from being broken without using a conventional ventilation pipe.

Next, as shown in FIG. 8 (a), the lower end (leg) of the above-mentioned drain stack 1 is usually connected to the horizontal drain main pipe 50 under the first floor. A substantially L-shaped leg joint 51 is used for the connection. The drain horizontal main pipe 50 is usually laid in a suspended manner on the concrete slab 9b on the first floor as shown in the figure. Then, as shown in the drawings (b) and (c) of FIG.
A “wedge-shaped” projection 51 a is also formed to protrude inward on the side surface (the right side surface in the figure) on the side connected to the upper surface of the horizontal main pipe 50. The projection 51a performs a function completely different from the function of the various projections 12, 21, 31, and 41 described above. The projection 51a drains the drainage flowing down while flowing around the entire inner wall surface of the drain stack 1. Before flowing into the horizontal main pipe 50, the water film Wa transmitted on the right side in the drawing, which is transmitted on the upper surface, has a function of branching and falling to the bottom surface side. The fluid can smoothly flow into the horizontal main pipe 50.

[0023]

According to the present invention, the trap can be reliably prevented from being broken without using the conventional ventilation pipe, so that the piping of the ventilation pipe becomes unnecessary. Therefore, the piping cost of the ventilation pipe is reduced and the construction cost is reduced. Can be achieved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a joint with a cleaning port, showing an embodiment of the present invention.

FIG. 2 is a side view showing a piping state of a drain stack, a fitting with a cleaning port, a lateral branch pipe, a drainage device, and the like.

FIG. 3 shows the flow of drainage in a drain stack; FIG. 3 (a) is a sectional view taken along line AA of FIG. 2; FIG. 3 (b) is a sectional view taken along line BB of FIG. (c) is a sectional view taken along line CC.

FIG. 4 shows a lid with “plate-shaped” projections,
(a) is a front view, and (b) is a side view and (c) is a side view.
Is a plan view.

FIG. 5 shows a lid with a “wedge-shaped” projection,
Diagram (a) is a front view, and diagram (b) is a side view and diagram.
(c) is a plan view.

FIG. 6 shows a lid provided with a “bump-shaped” projection, in which (a) is a front view, (b) is a side view, and (b) is a side view.
(c) is a plan view.

FIG. 7 shows another embodiment of the present invention. FIG. 7 (a) is a longitudinal sectional view of a drainage pipe joint, and FIG. 7 (b) is a DD diagram of FIG. 7 (a).
It is a line sectional view.

FIG. 8 (a) is a side view showing the connection state of the legs of the drain stack, FIG. 8 (b) is a longitudinal sectional view of the leg joint, and FIG. FIG. 7B is a sectional view taken along line EE of FIG.

FIG. 9 is a table showing the results of a tool drainage load experiment performed on the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Drainage stack pipe 2 ... Drain horizontal branch pipe 3 ... Pipe joint 5 ... Joint with a cleaning port 7 ... Toilet bowl (siphon jet type) 8 ... Trap 10, 20, 30 ... Lid 12 ... Protrusion ("plate type") 13: Part where no water film is formed 21 ... Projection ("wedge type") 31 ... Projection ("hump type") W ... Drainage Wa: Water film

[Procedure amendment]

[Submission date] May 23, 2001 (2001.5.2)
3)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

[Title of the Invention] Drainage pipe joint

[Claims]

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to drainage of high-rise buildings and the like.
To connect horizontal branch pipes of each floor to drainage stacks in the route
Drainage fittings .

[0002]

2. Description of the Related Art Conventionally, for example, in a high-rise building such as an apartment house or a hotel or a high-rise building such as a hotel, drainage drained from a drainage device on each floor is passed through a trap and then drained under a floor. The water flows into the pipe, then flows into the drainpipe, which runs through from the basement to the top floor of the building, and flows down to the basement at one time. The water is drained to the public sewer through the main pipe. On the other hand, a top ventilation pipe is provided at the top of the drain stack as an air supply port, whereby the inside of the drain stack is communicated with the atmosphere. In the drainage system of such a high-rise building, if a large amount of drainage flows into the drainage stack at once from the horizontal branch pipe, the drainage pipe on the middle floor where there is a distance from the above-mentioned top ventilation pipe and the drainage has the highest flow rate Is not enough air supply,
Negative pressure is likely to occur in the horizontal branch pipe.

On the other hand, the wastewater that has flowed into the drain stack is
It flows down while falling naturally along the inner wall of the drainage stack. When the amount of draining water flowing down increases, the drainage flows down the entire inner wall of the pipe and flows down like a water film. As a result, the horizontal branch pipe opening into the drainage stack is closed by the water film, and the communication between the horizontal branch pipe and the drainage stack is interrupted. Then, the inside of the horizontal branch pipe that temporarily became negative pressure due to the above cause is not recovered to atmospheric pressure,
Therefore, the negative pressure in the lateral branch pipe gradually increases and finally reaches a negative pressure at which the trap cannot be maintained, and the trap is broken. In order to prevent this, a so-called two-pipe construction method in which ventilation pipes are connected in parallel has conventionally been adopted. That is, a ventilation pipe is provided in parallel with the drainage stack pipe, and the inside of the horizontal branch pipe is communicated with the atmosphere via the ventilation pipe. According to this, a negative pressure state does not progress in the horizontal branch pipe, and the horizontal branch pipe is always maintained in a state of being restored to the atmospheric pressure, so that the trap is reliably prevented from being broken.

[0004]

The adoption of the two-pipe system can surely prevent the trap from being breached, but this increases the cost of piping the ventilation pipe, and also requires piping of the ventilation pipe. However, there is a problem that the construction cost rises as a result of having to secure a space for the construction. Therefore, the present invention is to prevent the opening of the drain horizontal branch pipe from being blocked by a water film and to obtain the same function as the ventilation pipe if the communication between the horizontal drain branch pipe and the drain stack can be properly secured. Drainage that can reliably prevent traps from being opened on each floor without incurring a rise in construction costs due to the adoption of the two-tube system.
It is intended to provide a pipe joint .

[0005]

SUMMARY OF THE INVENTION Therefore, the present invention provides
The drainage pipe joint having the configuration described in each claim was used. Claim 1
According to the described drain pipe fittings, the water film of the falling stack drain water
Is branched right and left by the protrusion,
An area where no water film exists in front of the inner opening of the horizontal branch pipe port
An enclosure is formed, and through this area, the space inside the drain lateral branch pipe and the drain
Communication with the air core in the spillway is maintained, and thus drainage
The inside of the horizontal branch pipe is maintained at atmospheric pressure. For this reason, the drain horizontal branch pipe
Even if the pressure inside the pipe temporarily becomes negative,
And thus track without the need for traditional ventilation
The sealing of the pump is well protected. Thus, claim 1
According to the invention of the above, the pressure in the pipe is reduced without using the conventional ventilation pipe.
The force fluctuation can be suppressed to prevent the trap from being breached.
This eliminates the need for ventilation pipe piping, thus reducing ventilation pipe piping costs.
And construction costs can be reduced.

According to the drainage pipe joint of the second aspect,
Pipe drainage flows into the pipe joint via the inner peripheral side of the inner pipe.
Since the inner peripheral surface of the inner tube is provided with projections,
Water film of drainage drainage flowing down the circumferential side branches to the left and right in the downflow direction
As a result, the inner opening of the lateral branch pipe port (horizontal branch drainage) is formed.
Area where no water film exists in front of the
Therefore, communication between the drain horizontal branch pipe and the air core in the drain stack
The condition is maintained, and this enables the air communication in the drain horizontal branch pipe.
State can be maintained. The configuration according to claim 2
In the position where the protrusion is provided,
Above the part, flows in through the inner opening of the lateral branch pipe receptacle
Above the horizontal branch drain, the water film flows down due to the protrusion
Branching left and right to open the inside of the lateral branch pipe port
A region where a water film is not formed is formed in front of the mouth, and the region is not formed.
The inside of the drain horizontal branch pipe communicates with the air core in the drain stack through the enclosure.
Refers to a position that is maintained in a closed state.

[0007] According to the drainage pipe joint according to the third aspect, drainage
The water film of the drainage from the vertical stack drained from the vertical stack
Branched downward and left and right, forming a water film downstream of the projection
Is formed, through which the drainage stack becomes empty.
The communication between the air core and the space inside the drain horizontal main pipe is maintained,
This makes it possible to maintain the inside of the drain horizontal main pipe at atmospheric pressure.
Wear. Sewage and paper are used for drainage flowing down the drain stack.
Solids or powdery substances such as
So-called discs that flow into the drain stack while
In the case of poser drainage, crushed garbage granules are mixed.
Are there. These solids flow down before drainage
Therefore, bends on the way from the drain stack to the horizontal drain main pipe
And then, like a weir,
Easily obstructs the smooth flow of wastewater flowing down from
No.

However, according to the projection of the third aspect ,
If not only drainage but also solid matter etc.
Because the deposition area at the bend is dispersed,
Water is easily washed away by the wastewater flowing down,
It can ensure a smooth flow of water to the horizontal main pipe
You. In this way, the horizontal drain main pipe is connected to the lower end of the drain stack.
Drainage pipe joint having an L-shaped bent shape used when connecting
Apply the flowing water film to the hand (so-called leg joint)
By providing a projection to branch to the right,
Maintain the atmospheric pressure in the pipe to ensure a smooth drainage flow
As well as the accumulation of solids at the bend.
Disperse the product area and make these flow smoothly together with drainage
be able to.

According to a fourth aspect of the present invention, there is provided a drainage system.
Smell at the inflow part of branch pipe drainage and at the bend to the horizontal drain main pipe
As a result, the water film of the wastewater flowing down is branched by the projections,
An area where no water film exists on the downstream side of the
Air core and drainage of drainage stack through area where membrane is not formed
The space inside the horizontal branch pipe and the drain horizontal horizontal pipe is always connected
The drain horizontal branch pipe and the drain horizontal
Drainage in the entire area of the drainage system by maintaining the pipe at atmospheric pressure
Smooth flow can be ensured.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the related art of the present invention is shown in FIG.
Explanation will be given based on FIG . FIG. 2 shows a simplified drainage path on a certain floor of a high-rise building such as a high-rise apartment. The drain stack 1 serving as a drain stack main pipe is laid through each floor to the top floor, and the inside of the pipe is communicated with the atmosphere. In the figure, reference numeral 9a denotes a concrete slab that partitions the above-mentioned floor and the lower floor. Here, as shown by a portion F in the figure, the drainage W flowing down in the drainage stack 1 does not have a speed reduction mechanism such as a speed reduction guide or a ventilation adjustment guide inside the pipe joint 3, so that the water W Generally, the water flows down along a pipe (JIS type joint, public corporation type joint, etc.), and therefore, as shown in FIG. 3 (a), the drainage W usually has a water film Wa on the inner wall surface of the pipe. An air wick is formed on the inner peripheral side of the water film Wa and communicates with the atmosphere via an extended ventilation pipe.

The drain horizontal branch pipe 2 is connected to the drain stack 1 via the pipe joint 3, and a drain end such as a toilet 7 is connected to the pipe end on the indoor side. The toilet 7 shown
Is a Western-style siphonette toilet (JIS A5207, symbol C1110) and has a trap 8 built-in. In the middle of the drain stack 1, a joint 5 with a cleaning port is interposed at an upper part of a portion where the horizontal branch pipe 2 is connected. FIG. 1 shows the joint 5 with a cleaning port alone. The joint with a cleaning port 5 includes a lid 10 for closing the cleaning port 6, and the lid 10 is detachably attached by a bolt 11.

The lid 10 has a projection 12 projecting into the drain stack 1 in the attached state shown in the figure. That is, as shown in FIG. 4, the lid 10 has a substantially disk shape, and a substantially flat protrusion 12 is formed on a side surface of the lid 10 which faces the inside of the drain stack 1 when it is attached. Are formed so as to project toward the center. The projection size of the projection 12 is set to, for example, about 30 mm so as to be sufficiently larger than the depth of the water film Wa formed on the inner wall.
As shown in (1), the water film Wa is surely branched right and left. Further, as shown in the drawing, the projection 12 is formed in a state of being inclined about 30 ° clockwise with respect to the direction downstream of the drainage W, that is, the direction of gravity. Therefore, the drainage W flowing down along the inner wall surface of the drain stack 1
It flows down in a state where it is branched right and left .

As described above, the protrusion 12 is provided inside the drain stack 1.
Is provided in a protruding state, so that the drainage W flowing down the drainage stack 1 in the state of the water film Wa as shown in FIG. Therefore, a portion 13 where the water film Wa is not formed below the projection 12 is formed on the inner wall surface of the drain stack 1 and above the opening 2 a of the horizontal branch pipe 2. For this reason, the opening 2a of the horizontal branch pipe 2 is not closed by the water film Wa, so that the communication with the air core formed inside the drain stack 1 is reliably maintained.

The horizontal branch pipe 2 communicates with the drainage stack 1 through a water film W
Therefore, even if a large amount of drainage flows into the drainage stack 1 from the horizontal branch pipe 1 and the inside of the horizontal branch pipe 2 temporarily becomes in a negative pressure state, the drainage is immediately performed when the flow becomes small. The communication of the upright 1 with the air core is restored, so that the inside of the lateral branch 2 returns to atmospheric pressure. If the inside of the horizontal branch pipe 2 is maintained at the atmospheric pressure, the sealing of the trap 8 is protected in a good state without breaking. As described above, since the inside of the lateral branch pipe 2 is reliably maintained at the atmospheric pressure without using the conventional ventilation pipe, the ventilation pipe becomes unnecessary, and the construction cost can be reduced. In addition, the sealing of the trap can be protected without providing a complicated speed reduction mechanism inside the drain stack, and the cost can be reduced in this respect as well. Further, since the projection 12 is provided on the removable lid 10, if the drainage stack is removed and cleaned periodically, there is no possibility that the drainage stack is clogged.

Next, a modified example of the projection 12 on the lid 10 will be described. The description of the points that do not need to be changed is omitted. Although the projection 12 exemplified above had a shape that could be called a “plate-shaped type”, the lid 20 shown in FIG. 5 had a wedge shape having a triangular cross-section with a pointed upper end and a shape to be called a “wedge-shaped type”. Are formed. The projection 21 also separates the water film Wa of the drainage W flowing down the inner wall surface of the drainage stack 1, thereby maintaining the communication between the horizontal branch pipe 2 and the drainage stack 1 and opening the trap 8. Can be prevented. In addition, the lid 30 shown in FIG. 6 is provided with a projection 31 of a so-called "bulb type", and the same effect as described above can be obtained by the projection 31.

Next, FIG. 9 shows the results of an instrument drainage load experiment conducted by the present applicant. In this experiment, a drainage test tower 30 m above the ground, which is equivalent to 9 floors, was used, and the above-mentioned joints 5 with cleaning ports were interposed in the drain stack 1 at every third floor (every 10 m). A horizontal branch pipe connected to the toilet bowl of the above is plumbed, and the drainage load is the siphon jet type toilet bowl described above (apparatus average drainage flow rate qd = 2.0 l / s)
From the 9th floor, and a total of 3 toilets on the lower floor
The negative pressure in the horizontal branch pipe is measured when the joint 5 is installed and when the joint 5 is not installed when the bases are sequentially added. The joint 5 has a lid 2 having the above-mentioned “wedge-shaped” projection 21 (angle 30 ° × projection dimension 30 mm).
0 is attached.

As a result, the maximum negative pressure when one toilet is loaded is about -76.44 Pa (about -76
7.8 mmAq), but about -13 when not installed
4.26 Pa (about -13.7 mmAq)
There was a difference of 7.82 Pa (about 5.9 mmAq). The maximum load when two toilets are loaded is about -172.48 Pa (about -17.6 mmA) when installed.
q), when not installed, about -285.18 Pa (about -2)
9.1 mmAq), a pressure difference of about 112.7 Pa (about 11.5 mmAq) is generated, and the maximum negative pressure when applying a load to three toilets is about -28 each.
7.14 Pa (about -29.3 mmAq), about -478.
24 Pa (-48.8 mmAq), and the difference was further widened. And when the joint 5 is not installed when the load of three toilet bowls is given, the limit value of about -392 Pa (-40 mmAq) at which the sealing of the trap is broken.
However, when it was installed, the negative pressure remained below the above-mentioned limit value, and the trap was still sealed. As described above, as a result of the experiment, by providing the projection 12 (or 21, 31) inside the drain stack 1 as described above, the rise in the negative pressure in the horizontal branch pipe 2 is surely suppressed, and By installing the projections 12 (or 21, 31) with the pipe joint 5 interposed at appropriate intervals in the drainage stack 1, the trap 8 can be replaced without using a conventional ventilation pipe.
It has been proved that the rupture of the garbage can be reliably prevented.

Next, an embodiment of the present invention will be described with reference to FIG.
Will be explained. In the related art described above, the configuration in which the projections 12 (21, 31) are provided on the lid 10 (20, 30) of the joint with a cleaning port 5 is illustrated, but the projections for branching the water film Wa are not necessarily removable. It is not necessary to have a configuration provided on the lid 10 (20, 30). Drainage fitting 40 illustrated above
Upper receptacle 43 to which a standpipe on the flow side (not shown) is connected
The inner tube 44 is provided along the periphery of the inner tube. Of this inner tube 44
The inner peripheral surface, the inner opening 42a of the horizontal branch pipe connection port 42
A projection 41 is formed on the upper side (above the inflow of horizontal branch pipe drain).
Has been established. This projection 41 is, as shown in FIG.
Wedge-shaped pointed upward when viewed from the center of the tube
In the right direction with respect to the downflow direction (vertical direction in the figure) of the stack drainage
Right inclined surface 41a inclined to the side and left inclined surface inclined to the left
41b.

According to the drainage pipe joint 40 configured as described above,
For example, the water film Wa flowing down through the drainage stack on the upstream side
The opening 4 is formed by the left and right inclined surfaces 41 a and 41 b of the projection 41.
2a, the inner opening 42 of the horizontal branch pipe connection port 42 to which a drain horizontal branch pipe ( not shown) is connected.
A portion 13 where the water film Wa is not formed (see FIG. 3) is formed in front of “a”. For this reason, the inside of the drain horizontal branch pipe and the drain
Communication with the air core formed in the center of the
It is maintained well at all times without drainage.
Even if the inside of the pipe becomes negative pressure temporarily, it will immediately reach atmospheric pressure.
Recovered and therefore various drainage without the traditional vent pipe
The trap water sealing of the device can be maintained well. Ma
Also, as described above, the pressure in
Since the force fluctuation can be suppressed, the ventilation pipe and its
Piping work is not required, and as a result,
Construction cost can be reduced. Thus the inner tube
44, and a projection 41 is provided on the inner peripheral side of the inner tube 44.
Besides the inner wall of the pipe joint
Thus, the projection is formed directly on the upper side of the opening 42a.
You may. Implementation of the invention described in claim 2 wherein the former configuration is
And the latter configuration corresponds to the first aspect of the present invention.
This corresponds to the embodiment.

Next, an embodiment of the invention described in claim 3 will be described.
Will be described. As shown in FIG. 8A, the lower end (leg) of the above-mentioned drain stack 1 is connected to the drain horizontal main pipe 50 under the floor of the first floor. L for connection
A leg joint 51 having a U-shaped bent shape is used.
The drain horizontal main pipe 50 is usually laid in a suspended manner on the concrete slab 9b on the first floor as shown in the figure. Then, as shown in FIGS. 5B and 5C, the side surface (the inside of the bend ) of the inside of the leg joint 51 and connected to the upper surface of the horizontal main pipe 50 is disposed in the drainage flowing direction. Inclination
A wedge-shaped projection 51a having a right inclined surface and a left inclined surface is formed so as to protrude inward. The projections 51a are formed by the various projections 12, 21, 31, 41 described above.
Fulfills the same function as, the inner wall surface of Drainage 1
The water film Wa flowing down is caused to flow down by the projections 51a.
By branching left and right, a water film W is formed below the protrusion 51a.
a is formed, and a region 13 is formed through the range 13.
The air core in the center of the water stack 1 and the space 5 in the horizontal main pipe 50
0a can be maintained in a connected state.

The drainage water flowing down the drain stack 1 (water
The membrane Wa) includes solid matter such as stool and paper or powdery matter.
Drainage stack 1 mixed with crushed garbage
In the case of so-called disposer drainage flowing into
Granules such as garbage are mixed. These solids, etc.
Because of its high density, it falls before drainage
First, at the bend on the way from the standpipe 1 to the drain horizontal main pipe 50
Reach and accumulate. Depending on the situation, the accumulation state of solids etc.
As shown by a two-dot chain line in FIG.
Sediment (sediment T ') and drainage that flows down later
Large pressure fluctuations occur in the pipe at the moment
Smooth drainage to horizontal main pipe 50 due to narrow road area
Easy to obstruct the flow. However, the protrusions illustrated above
According to the origin 51a, not only the drainage but also the solid matter etc. flows down.
It is branched right and left, and the deposition area at the bent part is dispersed.
You. For this reason, solids and the like are as high as the deposit T '.
Instead of being deposited, as shown by the solid line in FIG.
It is only deposited in a low layer (deposit T). Follow
Therefore, the flow path area of the leg joint 51 may be greatly impeded.
Because there is no drainage,
Flow can be ensured, and
Therefore, the deposit T can easily flow down (removed).
it can.

Next, as shown in FIG.
40 or projection above the inside opening of the lateral branch pipe receptacle
A drain pipe joint 40 'directly provided and the leg joint 51 are assembled.
The drainage stack 1 and each floor
Overall drainage route from horizontal branch pipes 2-2 to drain horizontal main pipe 50
The horizontal branch pipe 2 and the drain horizontal main pipe 50 to a drain stack
1 can be maintained in communication with the air core.
This allows the drainage to flow smoothly in the drainage channel,
The wrap can be maintained.

[Brief description of the drawings]

FIG. 1 shows a related art of the present invention and is a longitudinal sectional view of a joint with a cleaning port.

FIG. 2 is a side view showing a piping state of a drain stack, a fitting with a cleaning port, a lateral branch pipe, a drainage device, and the like.

FIG. 3 shows the flow of drainage in a drain stack, and is a diagram (a).
FIG. 3 is a sectional view taken along line AA of FIG. 2, and FIG.
FIG. 3 is a cross-sectional view taken along a line B, and FIG. 3C is a cross-sectional view taken along a line CC.

FIGS. 4A and 4B show a lid provided with a “plate-shaped” projection. FIG. 4A is a front view, FIG. 4B is a side view, and FIG. 4C is a plan view.

FIG. 5 shows a lid with a “wedge-shaped” projection,
(A) is a front view, (b) is a side view, and (c) is a plan view.

6A and 6B show a lid provided with a projection of a "bulb type", in which FIG. 6A is a front view, FIG. 6B is a side view,
(C) is a plan view.

7A and 7B show an embodiment of the present invention. FIG. 7A is a longitudinal sectional view of a drainage pipe joint, and FIG. 7B is a sectional view taken along line DD of FIG. 7A.

8 (a) is a side view showing the connection state of the legs of the drain stack, FIG. 8 (b) is a longitudinal sectional view of the leg joint, and FIG. FIG. 5B is a sectional view taken along line EE of FIG.

FIG. 9 is a table showing the results of a tool drainage load experiment performed on the present invention.

FIG. 10 is a diagram showing an embodiment of the invention described in claim 4;
FIG. 3 is a schematic side view of a drainage path.

[Explanation of Signs] 1 ... Drainage stack 2 ... Drain horizontal branch pipe 3 ... Fitting 5 ... Joint with cleaning port 7 ... Toilet bowl (siphon jet type) 8 ... Trap 13 ... Part where no water film is formed 40 ... Drainage pipe Joint 41: projection (wedge shape), 41a: right inclined surface, 41b:
Left inclined surface 42a Inner opening 44 Inner tube Wa Water film

[Procedure amendment 2]

[Document name to be amended] Drawing

[Correction target item name] Fig. 7

[Correction method] Change

[Correction contents]

FIG. 7

[Procedure amendment 3]

[Document name to be amended] Drawing

[Correction target item name] Fig. 8

[Correction method] Change

[Correction contents]

FIG. 8

[Procedure amendment 4]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Added

[Correction contents]

FIG. 10

Continuation of the front page (72) Inventor Yozo Kako 201, Yokocho, Tenpaku-ku, Nagoya-shi, Aichi Tenbaku Housing 3-706 F-term (reference) 2D061 AA04 AB06 AC05 3H019 BA04 BB01 BD05

Claims (4)

[Claims] The drainage pipe does not transmit the drainage flow to the inner wall of the drainage stack to form a range in which the flow of drainage flowing down the inner wall is branched to form a range where the drainage does not transmit to a part of the inner wall. A drain stack structure, wherein an opening of the drain horizontal branch pipe is located within the range and provided at a position where communication between the drain horizontal branch pipe and the drain stack can be maintained. 2. The drainpipe structure according to claim 1, wherein the projection is provided on a lid for closing an opening provided on a peripheral surface of the drainpipe. 3. The projection according to claim 1, wherein the projection is integrally formed inside a pipe joint used for connecting a drainage stack.
Structure of the drainage stack described. 4. The structure of a drain stack according to claim 1, wherein the projection is formed integrally with the inner wall of the drain stack.