JP2000120126A - Buffering air pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To buffer water hammer action due to drainage of non-constant quantity, obstruct air pressure variation and ascending of drainage, and smoothly drain water, by joining a plurality of vertical pipe systems with horizontal pipes, providing a specific bend on the way of an upper stream side horizontal pipe, setting confluence on the middle of a lower stream straight pipe, and submerging the extreme end of the horizontal pipe. SOLUTION: Drainage flowing in from a water receiving vessel 1 is substituted with trap sealing water to flow in a horizontal pipe 3, and falls from the associated part joint 4 of a vertical pipe to vertical pipes 5, 5'. The drainage revolvingly flows in from 90 deg. bend 6a enlarged in pipe diameter to horizontal pipes 7, 7', water hammer action is added to the upper stream side of a bend 8 or a confluent part deformed pipe 10, and water hammer action is added to an inflow pipe 12 through a horizontal main pipe 11. The extreme end 14 of an introducing pipe 13 is in the opened condition to submerge in a water level 16. Hereat, a buffering air pipe 18a of double pipe construction with a built-in vacuum break intake mechanism 26b in a buffer space and a buffering air pipe 25a on a horizontal pipe are provided on the parts to which the water hammer action is added. Hereby, water hammer on the lower stream of a vertical pipe leg part bend can be buffered.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a drain pipe for a high-rise building.

[0002]

2. Description of the Related Art A water receiving container such as a sanitary fitting is provided with a trap having a deodorizing water seal at a drain connection port to prevent a harmful gas from a sewer pipe from flowing back into a room.

[0003] The trap is usually sealed at a water depth of 50 to 100 mm in order to shut off odorous gas in the sewer pipe.

[0004] When an undetermined amount of wastewater flows into the drain pipe,
The air pressure in the drainage pipe immediately above the bend of the riser or above it rises temporarily, creating a negative pressure when the drainage passes, and then immediately equilibrating to atmospheric pressure.

[0005] In order to equilibrate the atmospheric pressure in the drainage pipe to the atmospheric pressure, a Y-shaped deformed pipe is mounted immediately above the bent pipe of the standing pipe leg, which is used as a starting point of ventilation, and a ventilation pipe is opened to the roof to open to the atmosphere. The vent pipe is effective if it has the same diameter or more than the drain pipe.

[0006] In the Y-shaped deformed pipe provided immediately above the bent portion of the standing pipe leg, drainage induced by the blowing of compressed air is blocked in a short period of time and the ventilation function is lost.

[0007] The ventilation is released from the horizontal pipe after the drain pipe of the water receiving container and connected to the ventilation pipe, but when the horizontal pipe is full of water, it is blocked by foreign matter.

[0008] Drainage dysfunction occurs most frequently on the lowest floor or directly above it. The air is compressed and repelled just above the leg curved pipe, causing an increase in the flow rate in the vertical stack and drainage from the higher floor. I think it is possible to find out.

[0009] The position where the non-quantitative drainage finally reaches is a bent leg at the leg of the stack, and atmospheric pressure fluctuation is detected immediately above the bent tube, but the falling water flow in the stack rises while passing through the vertical air layer. It decelerates due to air resistance and does not have a flow velocity that exceeds gravitational acceleration. The optimal phenomenon can be relatively understood by the speed of the falling water flow of the waterfall.

[0010] Even if an undetermined amount of water is dropped from the high-rise experimental device, the velocity of the water reaching the bent portion of the riser is attenuated to about 6 meters per second. The speed downstream of the riser leg is 0.6 meters per second, ideally reduced to one tenth.

[0011] The cross-sectional area of the horizontal pipe downstream of the bent leg section is small, the air layer is low, and the horizontal section is lying down. The falling water flow swirls when the inertia is horizontally converted while colliding with the bent section pipe. , Completely obstructing the cross section of the horizontal tube and colliding head-on with the air layer.

[0012] The drainage test apparatus designed by the conventional technique observes the behavior of air downstream of the riser leg curved pipe.
The tip is open for flow measurement, the air in the horizontal pipe is released, and there is no pressure fluctuation.To reproduce the drainage function failure, increase the vertical flow rate of the vertical pipe and discharge a large amount of water from the high floor Will be. Therefore, for the flow load test of the drainage equipment of a super-high-rise building, the experimental tower is also required to be a super-high-rise.

It is thought that if the skyscraper becomes an ultra-high-rise building, the experiments will become more difficult, and one private company will give up in the middle that it cannot bear the research investment.

There is no technique for setting the flow rate in the stack pipe, and the competence of the functions is determined by competing for the drainage amount during the experiment and conducting an experiment in which the pressure fluctuation width is not more than ± 25 mm water column.

When a large amount of water is drained from a high place, a negative pressure is generated in the high place in the vertical stack. We believe that the latest technology is to design a vacuum release valve to eliminate negative pressure.

When the air is directly ventilated to the atmosphere from the bottom horizontal drain pipe, the falling speed increases, and it is natural that a negative pressure is generated on the higher floor. He has not realized that the truth cannot be understood forever unless the tip of the pipe of the drainage experiment device is submerged.

[0017]

A non-quantitative amount of wastewater is loaded on a bent leg of a vertical pipe leg, and the pressure change caused by the inflow state into the horizontal pipe downstream of the bent pipe and the effect caused by the pressure fluctuation are observed. Promotes smooth drainage.

The air flow in the horizontal pipe generated by the non-quantitative drainage prevents the pressure fluctuation and the run-up of the drainage that affects the vertical stack of another system.

The magnitude of the water hammer effect on the horizontal piping due to the undetermined amount of water and the buffering of the water hammer are performed.

Investigation of foaming cause and development of foaming suppression technology when detergent-containing water flows non-quantitatively.

[0021] The phenomenon that foaming goes up to the lowest pipe and the floor immediately above due to foaming of the detergent-containing water is visualized, and the suppression technique is proved by visualization.

We developed a technique to suppress atmospheric pressure fluctuations in the horizontal pipe caused by the inflow of high-speed falling water, and demonstrated the ineffectiveness of a drainage flow load test using a super-high-rise experimental tower.

In order to show the most severe conditions numerically, and to make it possible to observe the air behavior in the horizontal pipe after the riser leg bent pipe,
The experiment is performed by submerging the tip of the drain pipe.

[0024]

Means for Solving the Problems A plurality of standpipe systems are assembled, pipes are joined by a horizontal pipe, and 9 pipes are provided in the middle of the upstream horizontal pipe.
A 0 ° curved pipe is provided, and a junction is set in the middle of the downstream straight pipe.
The tip of the horizontal pipe is submerged. The horizontal tube is visualized using a transparent tube.

The toilet flushing water volume is 1.5 liters per second, the cleaning time is 10 seconds, the flushing volume is 15 liters at a time, and the female toilet bowl is used once every 90 seconds, so the average volume per minute is 10 liters. A urinal for men is used once every 30 seconds, and the amount of flush water is 5 liters at a time.
Load liters.

The drainage flow load experiment apparatus continuously operates a pump having a discharge rate of 200 liters per minute.
The set of urinals is in the simultaneous drainage state, and the other systems are in the condition of simultaneous use of 10 sets of women's toilets.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The most powerful water receiving container is a toilet bowl.
Drain 15 l in 0 seconds. The inner diameter of the toilet connection pipe is 7
When the inside diameter of the vertical pipe is 100 mm, the flow velocity after the curved leg is 0.6 m / min, the water depth rises to the radius, and the water flows down smoothly if the inside diameter of the vertical pipe is 100 mm.

If the most severe condition is that one toilet is operated continuously six times per minute, the amount of inflow in the horizontal pipe is quantitative, but the air in the horizontal pipe cannot return to the vertical pipe and the air Squirt. This visualizes the phenomenon of drainage dysfunction.

When the drainage flow load test under the most severe conditions is performed,
Drainage is spouted out along with compressed air at the Y-shaped ventilation start point right above the riser leg curved pipe, and the cause of the short-term blockage of the ventilation start point is visualized.

Visualization that when the flow rate under the most severe conditions flows into the bent portion of the riser leg and thereafter, the swirling flow is performed, and the swirling flow is also performed at the downstream curved tube and the junction.

It has been found that the water flow at the flow rate under the harshest conditions exerts a water hammer action on the deformed pipe serving as the inertia conversion point. In order to suppress the generation of airflow and promote the smooth flow of drainage, a ventilation start point is provided on the inflow side of the deformed pipe, and an air pipe having a closed end is provided.

The amount of air sealed in the air pipe whose end is closed is 20 to 50% of the volume of the drainage horizontal pipe, and a compressive load is applied to the drainage by high pressure to generate a sliding shear force and realize a smooth flow.

In the detergent-containing water flow load test apparatus, a U-shaped running trap is provided in the horizontal main pipe, and the submerged state is set depending on the sealing depth, and the foaming phenomenon is visualized.

Confluence pipes are connected upstream and downstream of the running trap to visualize the foaming phenomenon.

When the detergent-containing water exerts a water hammer action on the trap sealing surface, it foams. It is visualized that the foam goes up to the standing leg and is crushed and drained by the drainage force.

A small-diameter pipe is joined to the inflow side and the outflow side of the running trap provided in the horizontal main pipe of the detergent-containing water to visualize foaming and foam run-up due to water hammer action.

[0038]

According to the present invention, a set of toilets discharges 15 liters at a time, and drains for 10 seconds. The flow rate is 1.5 liters per second. The average interval used by girls for small work is 90 seconds. The converted flow per minute is 1
0 liter. The flush valve water pressure is set at 90 liters.
If the reference value for one set of cleaning valves is 110 liters, it will be an excessive value and cause miscalculation.

The maximum load flow rate of the drainage flow load test device is:
100 liters per standing tube. 100 for two standing tubes
If × 2 = 200 liters per minute, 100 liters per system is equivalent to continuous use of the toilet 7 times per minute. In the case of 100 liters per system, the male urinal is equivalent to 12 consecutive uses per minute. The time required for operation of both the toilet flush valve and the urinal flush valve is 1.5 seconds.

The drainage pipe was visualized as a transparent pipe. Drainage flow state and air flow state can be observed. Observation of foaming phenomenon of detergent-containing water.

Assuming that the drainage load is continuous, the flow in the horizontal pipe after the bent portion of the standing leg is understood, air flows into the ventilation start point immediately above the bent portion of the standing leg, and drainage is ejected by induction. The cause of the blockage at the start of ventilation was found for a short period. The venting point immediately above the curved leg expired.

The drainage flow in the horizontal pipe floats up dirt at the water depth equivalent to the radius of the pipe, and ideally flows. In the observation with the experimental equipment, the swirling inflow was full due to the water hammer acting on the curved pipe. The air in the horizontal pipe goes upstream in the connecting pipe, blows off trapped water, and expires.

The water hammer requires a shock absorber. An air evacuating tube is provided on the drainage line to suppress foam run-up. Achieves prevention of other systems from blowing out air mass.

The water hammer action is on the upstream side of the curved pipe and the merging pipe. An air evacuating tube was installed to confirm the effect. The name is a buffer tube.

The bent leg tube and the venting start point T tube are enlarged, the standing tube is inserted deeply, a double tube structure is provided, and a buffer empty tube is provided.
Contains compressed air from a vertical pipe.

An air suction structure is provided on the buffer tube to break the vacuum after the drainage flow.

[0047]

[Brief description of the drawings]

FIG. 1 shows a two-stage stackpipe drainage pipe and ventilation pipe. The conventional standard drainage ventilation piping method is shown. The drainage flowing from the water receiving container 1 replaces the trap sealing water 2, flows into the horizontal pipe 3, falls from the association joint 4 of the vertical pipe to the vertical pipe 5, and turns from the bent pipe 6 to the horizontal pipe 7. Inflow, a water hammer action is applied to the bent pipe 8 or the confluence pipe 10, the tip 14 of the introduction pipe 13 is opened from the horizontal main pipe 11 to the inflow pipe 12, and the drainage amount and the atmospheric pressure are adjusted.
Measure and measure in the immediate vicinity of. Y is just above the riser tube 6
The ventilation pipe 18 is started from the ventilation start point of the shape, and connected to the top ventilation pipe 20 extending from the top of the drainage stack at the position 19;
Open to the atmosphere from the ventilation head 21 on the rooftop or top floor wall,
Equilibrate to atmospheric pressure. Right above the standing tube leg and 2-3
In order to eliminate the drainage dysfunction in the floor, a ventilation pipe 25 is started from the top 24 of the inflow pipe, and the inside pressure of the pipe is adjusted at a ventilation port 26 provided on an outdoor wall surface. Even in the experimental equipment and actual piping in the building, if the atmospheric pressure is easily balanced, the flow velocity in the pipe will increase and the trap sealing of the water receiving container on the upper floor will expire.

FIG. 2 shows the principle of raising the water level in a pot and air compression. When the basin 27 is pressed against the water surface 28 in the shape of a pot, the water level 29 in the pot rises, but the air in the pot is compressed to prevent the water level from rising. The principle of a buffer empty tube is shown.

FIG. 3 shows a buffer empty tube position. From the water receiving container 1 to the trap sealing water 2, the horizontal pipe 3 is extended from the horizontal pipe joint 4 to the vertical pipe 5 through the vertical pipe 5, and from the bent leg pipe 6 a to the horizontal pipe 7.
Then, a water hammer action is applied to the curved pipe 8 via the horizontal pipe 9, a water hammer action is applied from the horizontal pipe 9 to the upstream side of the junction pipe 10, and a water hammer action is applied to the inflow pipe 12 via the horizontal main pipe 11. Introduce pipe 13 to water level 16
The tip 14 is submerged in the inside. Buffer air tubes 18a and 25a are provided at portions where the water hammer action is applied. Buffer space 18a, 25a
Has a built-in suction mechanism 26b for vacuum break.

[Explanation of symbols]

1.1 '. 1 ".1" Water receiving container 2.2 '. 2 ".2" Drain trap sealing 3.3 '. 3 ".3" Each horizontal drainage pipe 4.4 '. 4 ".4" Standpipe joint joint 5.5 '. 5 ".5" Drainage stack 6.6a. 6 ". Curved leg 7.2". 7. Horizontal pipe downstream of curved pipe 8. Horizontal pipe downstream curved pipe 9. Converging section upstream horizontal pipe Confluence joint 11. Horizontal main pipe 12. Inflow pipe 13. Introduction pipe 14. 14. Introductory tube tip Experimental equipment low water level 16. Experimental equipment high water level 17.17 ". Ventilation start point 17a. Ventilation start point of double pipe structure 18.18". Vent riser 18a. Double tube structure buffer empty tube 19.19 ". Ventilation circuit top connection position 20.20". Extension vent 21.21 ". Vent head 22.22'.22". 22 ". Starting point of horizontal pipe ventilation 23.23'.23". 23 ". Ventilation manifold connection position 24. Inflow pipe top 25 Inflow pipe extension ventilation pipe 25a Absorbing air pipe above horizontal pipe 26. Low position ventilation port 26a Intake valve in buffer space 27. Washbasin / cover pot 28. Water surface 29 Water level in the basin and basin 30. Compressed air in the basin and basin

Claims (1)

[Claims] Claims: 1. A method for buffering a water hammer downstream of a riser leg bend.