JP4474504B2 - Outflow section structure of vertical pipe - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an outflow portion structure of a vertical pipe for vertically dropping water, such as a secondary pipe or a swirling flow pipe provided in a manhole in a sewer system.
[0002]
[Prior art]
FIG. 9 shows an example of a conventional vertical tube. The vertical pipe of FIG. 9 shows the case of the secondary pipe provided in the inside of the manhole in the sewage system, and is called the sub pipe in the inside of the human hole 1 made of, for example, a concrete frame built in the ground. A vertical pipe 2 is provided. The vertical pipe 2 has an inflow port 3 extending in the lateral direction connected to the upper end, and the lower end of the vertical tube 2 forms an outflow port 4 bent in the horizontal direction. It is connected to the downstream pipe 6 through the pipe 5.
[0003]
In the vertical pipe 2 of FIG. 9, the water flowing into the upper end of the vertical pipe 2 from the inlet 3 falls inside the vertical pipe 2 and collides with the bent bottom of the lower end, and then flows from the outlet 4 to the connecting pipe 5. It flows out and is drained to the downstream pipe 6.
[0004]
FIG. 10 shows another example of a conventional vertical tube. In FIG. 10, the inflow port 3 extending in the lateral direction is connected to the upper end in the same manner as in FIG. 9, and the blade for swirling flow is formed inside the vertical pipe 2 forming the outflow port 4 by bending the lower end in the lateral direction. 7 is fixed. In the figure, 8 is an air vent pipe provided at the upper center of the vertical pipe 2.
[0005]
In the vertical pipe 2 of FIG. 10, the water that has flowed into the upper end of the vertical pipe 2 from the inlet 3 flows down to the lower end while turning inside the vertical pipe 2 by the swirling flow blades 7 provided in the vertical pipe 2. , It flows out from the outlet 4 to the connecting pipe 5 and is drained to the downstream pipe 6.
[0006]
[Problems to be solved by the invention]
However, in the conventional vertical pipe 2 shown in FIG. 9 and FIG. 10, when the water drop height increases, the outflow speed of the water in the vicinity of the outlet 4 becomes about 7 meters / second or more. End up. For this reason, there has been a problem that the water from the vertical pipe 2 as described above cannot be drained into a sewer pipe such as the downstream pipe 6 based on an outflow speed of 3 meters / second or less, for example.
[0007]
For this reason, conventionally, various structures have been considered in which the flow path resistance is increased by reducing the diameter of the outlet 4 or the flow velocity is attenuated by providing a baffle plate at the outlet.
[0008]
However, in the case of the method of reducing the diameter of the outlet 4, when the amount of water falling through the vertical pipe 2 becomes a predetermined amount or more, water is stored up to the upper part inside the vertical pipe 2, and as a result, from the outlet 4. There is a problem that it is difficult to set the throttle amount of the outlet 4 because the flow rate of the flowing water increases.
[0009]
Further, in the system in which a baffle plate is provided at the outlet 4, a synthetic resin string or bag is caught on the baffle plate to narrow the flow path, thereby reducing the function of the vertical tube 2 or closing the vertical tube 2. There are problems such as.
[0010]
The present invention has been made to solve the problems of the conventional apparatus, and has an outflow portion structure for a vertical pipe that can reduce the flow velocity of water flowing out from the lower end of the vertical pipe with a simple and small configuration. The purpose is to provide.
[0011]
[Means for Solving the Problems]
According to the first aspect of the present invention, there is provided a vertical plate that surrounds the outer periphery of the lower end portion of the vertical pipe with a predetermined length and an annular interval on a fixed bottom surface at the lower end of the vertical pipe where water is dropped. An upward storage weir is fixed, and a vertical pipe outlet is formed at a position below the upper edge of the upward storage weir at the lower end portion of the vertical pipe, and the upper edge of the upward storage weir is formed outside the upward storage weir. A vertical pipe outlet structure, which is provided with a water channel for collecting overflowing water .
[0016]
According to the first aspect of the present invention, a storage weir having a vertical plate is provided on the outer periphery of the lower end portion of the vertical pipe so as to surround the outer periphery of the lower end portion with an interval, and the lower end of the vertical pipe Since the vertical pipe outlet is formed at the height where the storage weir is provided in the section, the water falling inside the vertical pipe flows by colliding with the vertical plate of the storage weir when it flows out of the vertical pipe outlet The resistance increases, and this flow resistance causes water to be stored in the lower end of the vertical pipe, so that the water falling inside the vertical pipe is attenuated by the water cushion effect when colliding with the stored water Will come to be.
[0017]
Furthermore, as described above, the water that falls inside the vertical pipe flows out of the vertical pipe outlet and is strongly attenuated by the flow resistance when it collides with the vertical plate of the storage weir. The water flow rate of water is greatly reduced. Therefore, the flow rate of water from the storage weir to the downflow pipe can be easily reduced with a simple configuration.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the drawings.
[0019]
1 to 3 show an example of the outflow portion structure of the vertical pipe of the present invention when applied to the vertical pipe comprising the secondary pipe shown in FIG. In the figure, the same components as those in FIG. 9 are denoted by the same reference numerals, and detailed description thereof is omitted.
[0020]
As shown in FIGS. 1 to 3, the bottom plate 9 closes the lower end of the vertical pipe 2 from which water is dropped. In the figure, the bottom plate 9 is installed on the fixed bottom surface 1 a of the human hole 1. On the upper surface of the bottom plate 9, an upward storage weir 11 whose upper side is open is formed by fixing a cylindrical vertical plate 10 that surrounds the outer periphery of the lower end portion of the vertical tube 2 with a predetermined annular interval. To do. At this time, the upward storage weir 11 may be provided on the fixed bottom surface 1a by fixing the vertical plate 10 separately from the bottom plate 9 on the fixed bottom surface 1a. Further, the upward storage weir 11 at this time may be formed of concrete or the like.
[0021]
Further, a plurality of vertical pipe outlets 12 toward the vertical plate 10 are formed at positions below the upper edge of the upward storage weir 11 on the outer peripheral surface of the lower end portion of the vertical pipe 2. In the example of FIG. 2, the vertical pipe outlet 12 is provided at the lowermost end portion of the vertical pipe 2 closest to the bottom plate 9, and the vertical plate 10 reaches a position higher than the height position of the vertical pipe outlet 12. It extends. The vertical pipe outlet 12 is preferably a circular shape that is difficult to clog things, but the shape is not limited to this and can be variously selected. Further, a drain drain port 13 is formed at the lowermost portion of the upward storage weir 11.
[0022]
On the other hand, in the example of FIG. 2, the vertical pipe outlet 12 is provided at a position closest to the bottom plate 9, but the vertical pipe outlet 12 may be provided at an upper position away from the bottom plate 9. In this case, it is preferable to provide a drain hole in the vertical pipe 2 in the vicinity of the bottom plate 9.
[0023]
Further, the fixed bottom surface 1a of the human hole 1 surrounds the outer periphery of the upward storage weir 11 with a space, and a water channel 14 for guiding water overflowing from the upper edge of the upward storage weir 11 to the outlet 4. Is forming.
[0024]
1 to 3, the vertical pipe outlet 12 is formed at the lower end of the vertical pipe 2 whose lower end is closed by the bottom plate 9, and the outer periphery of the lower end of the vertical pipe 2 is formed. Since the upward storage weir 11 having the vertical plate 10 that surrounds and faces the vertical pipe outlet 12 is provided, the water falling inside the vertical pipe 2 flows into the upward storage weir 11 and the vertical pipe 2. It is stored in the lower end. Accordingly, the water falling inside the vertical pipe 2 is effectively attenuated in the fall energy due to the water cushion effect when colliding with the water stored in the vertical pipe 2, and thus the impact force on the bottom plate 9 is also remarkably increased. Reduced.
[0025]
Furthermore, the water in the vertical pipe 2 flows out radially from the plurality of vertical pipe outlets 12, passes through the water accumulated in the upward storage weir 11, and collides with the vertical plate 10. The flow resistance ensures that the water momentum is attenuated. At this time, because of the flow resistance, water is stored in the vertical pipe 2 to a predetermined position higher than the height of the upward storage weir 11 as shown by a broken line in FIG. Thus, the water cushion effect of the falling water is surely exhibited.
[0026]
The water whose momentum is attenuated by the above-described flow resistance overflows from the upper edge of the upward storage weir 11 and flows out to the outside. The overflowing water is collected by the water channel 14 and goes to the outlet 4. Accordingly, the water flowing toward the outlet 4 has a low flow rate. Thus, the flow rate of water from the upward storage weir 11 toward the downstream pipe 6 can be easily reduced with a simple configuration.
[0027]
FIG. 4 shows another example of the outflow portion structure of the vertical pipe shown in FIGS. FIG. 4 shows the case where the upward storage weir 11 is fixed on the fixed bottom surface 1a, and the vertical tube 2 is hung with its upper portion fixed by a support device (not shown) and fixed to the lower end of the vertical tube 2. A vertical pipe outlet 12a facing the bottom surface 1a is formed. The longitudinal pipe outlet 12a is positioned below the upper edge of the upward storage weir 11.
[0028]
In the outflow part structure of the vertical pipe shown in FIG. 4, the water falling in the vertical pipe 2 collides with the fixed bottom surface 1a so that the fall energy is effectively attenuated and further spreads to the outer periphery and flows upward. By virtue of the flow resistance caused by the collision with 11, the momentum of the water is surely attenuated. At this time, because of the flow resistance, water is stored in the vertical pipe 2 to a predetermined position higher than the height of the upward storage weir 11 as shown by a broken line in FIG. Thus, the water cushion effect of the falling water is surely exhibited.
[0029]
The water whose momentum is attenuated by the above-described flow resistance overflows from the upper edge of the upward storage weir 11 and flows out to the outside. The overflowing water is collected by the water channel 14 and goes to the outlet 4. Accordingly, the water flowing toward the outlet 4 has a low flow rate.
[0030]
FIG. 5 shows still another example of the outflow part structure of the vertical pipe of the present invention. As shown in FIG. 5, the bottom plate 9 closes the lower end of the vertical pipe 2 from which water is dropped. Further, the outer periphery of the lower end portion of the vertical pipe 2 is vertically surrounded by a predetermined length and an annular interval, and the upper end is fixed to the vertical pipe 2 by the upper plate 15 and the lower end is opened 16. A downward storage weir 18 is formed by providing 17. At this time, the opening 16 formed at the lower end of the vertical plate 17 may be a continuous slit (interval), a plurality of intermittent slits, or a hole having a required shape such as a circle. Also good.
[0031]
Further, a plurality of vertical tube outlets 19 directed to the vertical plate 17 are formed at the lower position of the upper plate 15 on the outer peripheral surface of the lower end of the vertical tube 2. In the example of FIG. 5, the vertical pipe outlet 19 is provided at a position higher than the bottom plate 9, and the lower end of the vertical plate 17 of the downward storage weir 18 extends below the height position of the vertical pipe outlet 19. . The bottom plate 9 is installed on the fixed bottom surface 1a of the human hole 1, and the fixed bottom surface 1a of the human hole 1 surrounds the outer periphery of the downward storage weir 18 in the same manner as in FIG. A water channel 14 for guiding water is formed. A drain drain port 20 is formed at the lowermost end portion of the vertical tube 2 adjacent to the bottom plate 9. An air vent 26 is provided in the upper plate 15 of the downward storage weir 18.
[0032]
In the vertical pipe outlet structure shown in FIG. 5, a vertical pipe outlet 19 is formed at the lower end of the vertical pipe 2 whose lower end is closed by the bottom plate 9, and the outer periphery of the vertical pipe 2 is surrounded so as to Since the downward storage weir 18 having the vertical plate 17 facing the outlet 19 and having the upper plate 15 closed by the upper plate 15 and having the lower end opened 16 is provided, the water falling inside the vertical tube 2 is discharged into the plurality of vertical tube outlets. The water flows out radially from 19, passes through the water staying in the downward storage weir 18 and collides with the vertical plate 17, and the momentum of the water is surely attenuated by the flow resistance at this time.
[0033]
Further, at this time, due to the flow resistance, water is stored in the vertical pipe 2 to a predetermined position higher than the height of the downward storage weir 18 as shown by a broken line in FIG. The falling water is effectively attenuated by the water cushion effect when the water that falls inside as shown by the broken line arrow collides with the water stored in the vertical pipe 2.
[0034]
The water whose momentum is attenuated by the flow resistance described above flows out from the opening 16 of the downward storage weir 18 in the circumferential direction. The water flowing out from the opening 16 is collected by the water channel 14 and goes to the outlet 4. Accordingly, the water flowing toward the outlet 4 has a low flow rate. Thus, the flow rate of water from the downward storage weir 18 toward the downstream pipe 6 (see FIG. 1) can be easily reduced with a simple configuration.
[0035]
FIG. 6 shows another example of the outflow portion structure of the vertical pipe of FIG. FIG. 6 shows a case where the vertical pipe 2 to which the downward storage weir 18 is fixed by the upper plate 15 is suspended with its upper part fixed by a support device (not shown). A vertical pipe outlet 19 is formed. Further, the bottom plate 9 closing the lower end of the vertical tube 2 is provided with a vertical tube outlet 19a facing the fixed bottom surface 1a.
[0036]
In the outflow portion structure of the vertical pipe shown in FIG. 6, most of the water falling inside the vertical pipe 2 flows out radially from the plurality of vertical pipe outlets 19 and stays in the downward storage weir 18. Passing through the water, it collides with the vertical plate 17 of the downward storage weir 18, and the momentum of the water is reliably attenuated by the flow resistance at this time. Further, a part of the water in the vertical tube 2 is attenuated by flowing out from the vertical tube outlet 19a formed in the bottom plate 9 and colliding with the fixed bottom surface 1a. At this time, because of the flow resistance, water is stored in the vertical pipe 2 to a predetermined position higher than the height of the downward storage weir 18 as shown by a broken line in FIG. The falling energy of the water falling as indicated by the broken arrow is effectively attenuated by the water cushion effect when colliding with the water stored in the vertical pipe 2.
[0037]
The water whose momentum is attenuated by the flow resistance flows out from the lower opening 16 of the downward storage weir 18 to the outside. The discharged water is collected by the water channel 14 and goes to the outlet 4. Accordingly, the water flowing toward the outlet 4 has a low flow rate.
[0038]
7 and 8 show still another example of the vertical pipe outlet structure of the present invention. As shown in FIGS. 7 and 8, the lower end of the vertical pipe 2 from which water is dropped is closed by the bottom plate 9, and on the bottom plate 9, the outer periphery of the lower end portion of the vertical pipe 2 has an annular space 25. A surrounding storage weir 23 having a vertical plate 22 having a discharge port 21 is formed on one side that surrounds and faces the outlet 4 in the circumferential direction.
[0039]
Further, a plurality of vertical pipe outlets 24 directed to the vertical plate 22 are formed in the annular space 25 on the outer peripheral surface of the lower end of the vertical pipe 2. The vertical pipe outlet 24 of FIGS. 7 and 8 is provided at the lowermost end portion of the vertical pipe 2 close to the bottom plate 9, and the discharge port 21 is also provided so as to be in contact with the bottom plate 9. At this time, the vertical pipe outlet 24 is not provided on the outer peripheral surface of the vertical pipe 2 facing the position where the discharge port 21 of the surrounding storage weir 23 is provided. In the figure, 26 is an air vent provided in the upper part of the surrounding storage weir 23.
[0040]
On the other hand, in the example of FIG. 7, the vertical pipe outlet 24 is provided at a position closest to the bottom plate 9, but the vertical pipe outlet 24 may be provided at an upper position away from the bottom plate 9. In this case, it is preferable to provide a drain hole in the vertical pipe 2 in the vicinity of the bottom plate 9.
[0041]
7 and 8, the vertical pipe outlet 24 is formed in the outer periphery of the lower end of the vertical pipe 2 whose lower end is closed by the bottom plate 9, and the outer periphery of the lower end of the vertical pipe 2 is formed. Since the surrounding storage weir 23 having the annular space 25 and surrounding and having the discharge port 21 is provided on one side in the circumferential direction of the vertical plate 22, a plurality of water drops falling inside the vertical pipe 2 as indicated by broken line arrows. From the vertical pipe outlet 24, which flows radially in the horizontal direction, passes through the water staying in the annular space 25 of the surrounding storage weir 23 and collides with the vertical plate 22. Is surely attenuated.
[0042]
Further, at this time, due to the flow resistance, water is stored in the vertical pipe 2 up to a predetermined position higher than the height of the surrounding storage weir 23 as shown by a broken line in FIG. The falling energy of the water dropped inside is effectively attenuated by the water cushion effect when colliding with the water stored in the vertical pipe 2.
[0043]
The water whose momentum is attenuated by the flow resistance described above flows out from the discharge port 21 provided on one side toward the outflow port 4. Water flowing toward the outlet 4 at this time has a low flow rate. Thus, the flow rate of water from the surrounding storage weir 23 toward the downstream pipe 6 (see FIG. 1) can be easily reduced with a simple configuration.
[0044]
In addition, although the case where it applied to the outflow part of the vertical pipe which consists of a sub pipe provided in the inside of a human hole was demonstrated in the said form example, it can apply also to the outflow part of vertical pipes, such as a swirl flow pipe, The shape is not limited to that shown in the drawings, but may be, for example, a rectangle other than the ring shape, and various other modifications may be made without departing from the scope of the present invention.
[0045]
【The invention's effect】
According to the present invention, a storage weir having a vertical plate is provided on the outer periphery of the lower end portion of the vertical pipe so as to surround the outer periphery of the lower end portion with an interval, and the storage weir at the lower end portion of the vertical pipe is provided. Since the vertical pipe outlet is formed at the height position, the water falling inside the vertical pipe collides with the vertical plate of the storage weir when it flows out of the vertical pipe outlet, and the flow resistance increases. The resistance causes water to be stored in the lower end portion of the vertical pipe, and therefore, the water falling inside the vertical pipe has an effect that the fall energy is attenuated by the water cushion effect when colliding with the stored water.
[0046]
Furthermore, as described above, the water that falls inside the vertical pipe flows out of the vertical pipe outlet and is strongly attenuated by the flow resistance when it collides with the vertical plate of the storage weir. The water flow rate of water is greatly reduced. Therefore, it is possible to easily reduce the flow rate of water from the storage weir to the downflow pipe with a simple configuration.
[Brief description of the drawings]
FIG. 1 is a side view showing an example of a configuration of an outflow portion structure of a vertical pipe according to the present invention.
FIG. 2 is a cross-sectional view showing details of a portion II in FIG.
3 is a view taken in the direction of arrows III-III in FIG. 2;
4 is a cross-sectional view showing another example of the outflow portion structure of the vertical pipe of FIG. 2;
5 is a cross-sectional view similar to FIG. 2, showing still another example of the configuration of the outflow portion structure of the vertical pipe of the present invention. FIG.
6 is a cross-sectional view showing another example of the outflow portion structure of the vertical pipe of FIG. 5. FIG.
7 is a cross-sectional view similar to FIG. 2, showing still another example of the configuration of the outflow portion structure of the vertical pipe of the present invention. FIG.
8 is a VIII-VIII direction arrow view of FIG. 7;
FIG. 9 is a side view showing an example of a conventional vertical pipe.
FIG. 10 is a cut side view showing another example of a conventional vertical pipe.
[Explanation of symbols]
2 Vertical pipe 10 Vertical plate 11 Upward storage weir 12 Vertical pipe outlet 12a Vertical pipe outlet 14 Water channel 15 Upper plate 16 Opening 17 Vertical plate 18 Downward storage weir 19 Vertical pipe outlet 19a Vertical pipe outlet 21 Discharge port 22 Vertical plate 23 Enclosed storage weir 24 Longitudinal pipe outlet 25 Annular space

Claims (1)

An upward storage weir consisting of a vertical plate that surrounds the outer periphery of the lower end of the vertical pipe with a predetermined length and an annular interval is fixed on the fixed bottom surface of the lower end of the vertical pipe where water is dropped. Forming a vertical pipe outlet at a position below the upper edge of the upward storage weir at the lower end portion of the vertical pipe, and collecting water overflowing from the upper edge of the upward storage weir on the outside of the upward storage weir A vertical pipe outlet structure characterized by having a water channel .

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