JP3827590B2 - Exhaust structure in pipe and exhaust method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an exhaust structure and an exhaust method in a pipeline, and more particularly to an exhaust structure and an exhaust method in an overturned pipeline.
[0002]
[Background Art and Problems to be Solved by the Invention]
In general, when passing an underground waterway under obstacles such as rivers, waterways, railways, and underground objects that cannot be relocated, it is possible to form a pipe called an overturn as a pressure pipe for a reverse siphon. Are known.
[0003]
Such an overhang structure is constructed by providing a vertical undercover chamber on both sides of the obstacle, and connecting upstream and downstream with a heading pipe with a downward slope toward the horizontal or downstream. Water is allowed to flow from the side to the downstream side.
[0004]
By the way, the water flowing in such an overpass pipe is mixed with air compressed by water pressure, and such compressed air flows from the upstream side of the overpass pipe along with the flow of water. When the flow of water flows downstream and the flow of water rises at the outlet on the downstream side, the air rapidly rises while expanding and disturbs the flow of water on the downstream side, faster than the flow of water.
[0005]
In particular, when a facility such as a pump chamber is provided adjacent to the downstream side, if the water flow is disturbed, the facility may be adversely affected.
[0006]
For example, in the case where there is a pump chamber, there is a possibility that an eccentric load is applied to the pump due to disturbance of the flow of water, causing a harmful effect, making it impossible to pump a specified amount, or causing the pump to cavitate.
[0007]
In addition, when the amount of rising air increases, the manhole cover may be blown off, resulting in inundation damage in the vicinity due to the water ejection phenomenon.
[0008]
It is thought that when the air is blown up or water is blown up together with the air, and there is a manhole or the like, the manhole cover is blown off by the blown up air or a large amount of water. .
[0009]
The object of the present invention is to prevent the air mixed in the water passing through the overpass pipe from disturbing the flow of the downstream water, thereby adversely affecting the downstream facilities, and the downstream air or An object of the present invention is to provide an exhaust structure and an exhaust method in a pipeline that can prevent a manhole cover or the like from being blown out by water jetting and prevent inundation damage in the vicinity due to the water jetting phenomenon.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the exhaust structure in the pipe of the present invention includes an upstream pipe provided at a high position on the upstream side and a downstream provided at a position lower than the upstream pipe on the downstream side. A concealed pipe having a side pipe, an upper and lower side overpass chamber connected to the upstream side pipe and the downstream side pipe and extending downward, and a lower pipe connecting the lower ends of the upper and lower side overpass chambers. And overpass
In pipes that allow underground water flow from upstream to downstream due to water head differences,
The top of the said bend down over tube imaginary one end is closed, and the other end is opened, the air collection holes of several collecting the air contained in the water flowing through the facedown over tube imaginary wherein Arranging air collection means having along the axial direction of the underground pipe,
An air exhaust pipe having one end opened to the atmosphere is connected to the open end of the air collecting means,
The air contained in the water flowing through the overpass pipe is discharged to the atmosphere.
[0011]
According to the present invention, the compressed air contained in the water flowing through the overpass pipe is collected by the air collection means disposed at the top of the overturn pipe, and the air connected to the air collection means is collected. By discharging the air collected by the discharge pipe to the atmosphere, it is possible to prevent the compressed air mixed in the water flowing in the overpass pipe from rising suddenly on the downstream side and disturbing the water flow.
[0012]
In particular, when a facility such as a pump chamber is provided adjacent to the downstream side, it is possible to prevent the facility from being adversely affected by disturbance of the water flow.
[0013]
In addition, the amount of rising air increases, and it is possible to prevent water from being blown up with air blowing up or air blowing up, and manholes and other lids are blown off, resulting in inundation damage in the vicinity due to the water blowing phenomenon. .
[0014]
In the present invention, the air collecting means can be disposed in the vicinity of the downstream side overhanging chamber in the overpass pipe.
[0015]
By adopting such a configuration, compressed air can be reliably collected by the air collecting means on the downstream side of the overpass pipe, and the compressed air mixed in the water rapidly rises in the downstream overturning chamber. Thus, the water flow can be prevented from being disturbed.
[0016]
In this case, the air collecting means can be disposed in the vicinity of the upstream-side cover chamber in the cover tube.
[0017]
By adopting such a configuration, in addition to the air collecting means in the vicinity of the downstream overhead chamber, the upstream air is collected and opened to the atmosphere by the air collecting means disposed in the vicinity of the upstream sleeping room. In particular, when water flows down from the upstream pipe line to the upstream cover chamber on the upstream side in a waterfall state, bubbles generated there can be reliably collected.
[0018]
In this invention, the said air collection means can be arrange | positioned over the full length in the said overpass pipe.
[0019]
By adopting such a configuration, the compressed air mixed in the water can be reliably collected and released to the atmosphere over the entire length of the overpass pipe, and the flow of water is more reliably disturbed downstream. Can be prevented.
[0020]
In the present invention, the air in the air collecting means may be forcibly discharged by a compressor provided on the upstream side of the air collecting means or a pump provided on an air discharge pipe provided on the downstream side. it can.
[0021]
By adopting such a configuration, the air in the air collecting means is forcibly discharged by the compressor or the pump , so that the once collected air can be reliably discharged to the atmosphere without being mixed into the water again. .
[0022]
The exhaust method in a pipe line of the present invention is carried over from an upstream pipe line provided at a high position on the upstream side to a downstream pipe line provided at a position lower than the upstream pipe line on the downstream side. A method for exhausting the pipe through the underground pipe having a pipe and allowing water to flow underground due to a head differential,
Is disposed on top of the said bend down over tube imaginary one end is closed, and the other end is opened, the air collection means having along an air collection holes in multiple in the axial direction of the saphenous over tube imaginary And collecting the air contained in the water flowing in the overpass pipe;
The air collected by the air collecting means is discharged to the atmosphere through an air discharge pipe connected to the opening end of the air collecting means and one end opened to the atmosphere.
[0023]
According to the present invention, it is possible to prevent the compressed air mixed in the water passing through the overpass pipe from disturbing the flow of the downstream water and prevent the downstream facility from being adversely affected, It is possible to prevent a manhole or the like from being blown off by a jet of air or water on the downstream side, and inundation damage can be prevented from occurring due to a jet of water.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0025]
1 and 2 are diagrams showing an exhaust structure in a pipe line according to the first embodiment of the present invention.
[0026]
FIG. 1 is a cross-sectional view showing the entire exhaust structure in a pipe line of the present embodiment.
[0027]
The pipeline 10 in the exhaust structure in this pipeline is used as, for example, a sewer pipeline, and has an upstream pipeline 12, a downstream pipeline 14, and an overturn pipeline 16.
[0028]
The upstream side pipeline 12 and the downstream side pipeline 14 are arranged on the upstream side and the downstream side with the obstacle 18 in between.
[0029]
The upstream pipeline 12 is provided at a high position, and the downstream pipeline 14 is provided at a position lower than the upstream pipeline 12.
[0030]
The overpass pipe 16 is connected to the upstream pipe line 12 and extends downward from the obstacle 18, and is connected to the downstream pipe line 14 and is similar to the upstream cover room 20. A downstream cover chamber 22 extending below the obstacle 18, and an underlying pipe 24 connecting the lower ends of the upstream cover chamber 20 and the downstream cover chamber 22 below the obstacle 18. Have.
[0031]
Further, the inside of the overpass 16 is filled with water 26, and the overpass from the upstream pipe 12 is caused by a water head difference resulting from a water level difference H between the upstream water surface 28 and the downstream water surface 30. Water 26 is allowed to flow through the pipeline 16 to the downstream pipeline 14.
[0032]
Above the upstream cover chamber 20 and the downstream cover chamber 22, manholes 34 and 36 are provided up to the ground 32, and lids 38 and 40 are provided on the manholes 34 and 36.
[0033]
Further, an air collecting pipe 44 as an air collecting means for collecting the compressed air mixed in the water 26 flowing in the overpass pipe 24 is provided on the top 42 in the overpass pipe 24. 24, the lower end is connected to the end of the air collecting pipe 44 on the downstream side cover chamber 22 side, and the upper end is opened to the atmosphere in the manhole 36. Arranged along the overhead room 22 and the manhole 36.
[0034]
As shown in FIG. 2 (1), the air collection pipe 44 is provided with an air collection hole 48 on the lower side thereof over the entire length, and the air collection hole 48 is elongated as shown in FIG. 2 (2). It is in a state of being arranged in a staggered manner at a predetermined interval over the direction (the axial direction of the overpass tube 24).
[0035]
The air collection hole 48 has a size and shape that allows air to pass but prevents water from passing through.
[0036]
The air discharge pipe 46 is closed in the circumferential direction.
[0037]
And according to the exhaust structure in such a pipe line, the water 26 flows from the upstream pipe line 12 provided in the high position of the upstream side to the downstream pipe line 14 side through the overpass pipe line 16. When going, the compressed air mixed in the water 26 flowing in the overburden pipe 24 in a state compressed by the water pressure gathers at the top 42 in the overburden pipe 24, and gathered at this top 42. Compressed air can be taken into the air collection tube 44 from the air collection hole 48 of the air collection tube 44.
[0038]
The air 50 taken into the air collection pipe 44 is collected at the top of the air collection pipe 44, and the air 50 is discharged into the manhole 36 by the air discharge pipe 46.
[0039]
Therefore, it is possible to prevent the compressed air mixed in the water 26 flowing in the overpass pipe 24 from abruptly rising while expanding in the downstream overpass chamber 22 on the downstream side, and the downstream overpass chamber The water can be allowed to flow to the downstream pipe line 14 without satisfying the flow of water in 22.
[0040]
As a result, even when a facility such as a pump chamber is provided adjacent to the downstream side, it is possible to prevent the facility from being adversely affected by the disturbance of the water flow.
[0041]
In addition, the amount of rising air is increased, and it is prevented that the air blows up or the water is blown up together with the air blowing up and the lid 40 such as the manhole 36 is blown off to cause inundation damage in the vicinity due to the water ejection phenomenon can do.
[0042]
FIG. 3 shows another example of the air collecting means.
[0043]
In FIG. 1A, the air collecting pipe 52 has a double pipe structure of an outer pipe 54 and an inner pipe 56, a plurality of air collecting holes 58 are provided around the outer pipe 54, and the air directed upward in the inner pipe 56 is shown. Even when the water 26 enters the outer pipe 54 by providing the collection hole 60, the inner pipe 56 can reliably guide the air to the air discharge pipe so that the water 26 does not enter the inner pipe 56. I am doing so.
[0044]
A plurality of these air collecting holes 58 and 60 are also arranged along the axial direction of the overpass tube 24, and have a size and shape that allow air to pass but prevent water from passing through.
[0045]
In FIG. 2B, as an air collecting means, an air collecting partition wall 62 having a large number of air collecting holes 61 is provided at the top portion 42 of the overpass pipe 24, and air is collected above the air collecting partition wall 62. I am trying to get it.
[0046]
The air collection hole 61 is the same as that in each of the embodiments.
[0047]
The figure (3) has a double structure in which an air collection partition wall 64 having an air collection hole 61 having the same configuration is provided at a lower position in addition to the air collection partition wall 62 of FIG. Thus, even if the water 26 enters the air collection partition wall 64, the water 26 does not enter the air collection partition wall 62.
[0048]
In this case, for example, even when water enters above the air collection partition wall 64, the pressure does not increase because the height from the air collection partition wall 64 to the water surface is low, and the air collection partition wall 62 is exceeded. Thus, it becomes difficult for water to enter upward, and even when water enters beyond the air collection partition wall 62, water intrusion can be prevented more reliably.
[0049]
In FIG. 4 (4), a film 68 that allows the passage of air but does not allow the passage of water is provided in the air collection hole 67 formed in the air collection pipe 66. Therefore, only air is surely taken into the air collecting pipe 66.
[0050]
The film 68 may be a plate-like member having a similar function.
[0051]
FIG. 4 is a view showing an exhaust structure in the pipe line according to the second embodiment of the present invention.
[0052]
In this embodiment, a compressor 70 is connected to the overpass pipe 24 in the exhaust structure in the pipe line of the first embodiment, compressed air is supplied into the overpass pipe 24, and an air collecting pipe is provided. The air collected in 44 is forcibly discharged to the atmosphere through the air discharge pipe 46.
[0053]
Thus, by forcibly discharging the air in the air collection pipe 44 by the pump 72, the once collected air can be reliably discharged to the atmosphere without being mixed into the water again.
[0054]
Further, the compressed air is supplied into the air collecting pipe 44 by the compressor 70, so that the water 26 can be prevented from entering the air collecting pipe 44.
[0055]
Other configurations and operations are the same as those in the above embodiment, and a description thereof will be omitted.
[0056]
FIG. 5 is a view showing an exhaust structure in the pipe line according to the third embodiment of the present invention.
[0057]
In this embodiment, instead of the compressor 70 in the second embodiment, a pump 72 as a forced exhaust means is attached to the air discharge pipe 46 so that the air in the air collection pipe 44 is forcibly sucked and discharged. I have to.
[0058]
The end of the air collection pipe 44 opposite to the air exhaust pipe 46 is in a closed state so that water cannot enter from here.
[0059]
Other configurations and operations are the same as those of the above-described embodiments, and the description thereof is omitted.
[0060]
FIG. 6 is a view showing an exhaust structure in the pipe line according to the fourth embodiment of the present invention.
[0061]
In this embodiment, the air collection pipe 74 is arranged in the vicinity of the downstream side overpass chamber 22 in the overpass pipe 24, compared to the case where it is provided over the entire length of the overpass pipe 24, The cost is reduced, and the compressed air is surely collected on the downstream side in the overpass tube 24.
[0062]
The end of the air collection pipe 74 opposite to the air discharge pipe 46 is in a closed state so that water cannot enter from here.
[0063]
Other configurations and operations are the same as those of the above-described embodiments, and the description thereof is omitted.
[0064]
FIG. 7 is a view showing an exhaust structure in the pipe line according to the fifth embodiment of the present invention.
[0065]
In this embodiment, in addition to the state of the fourth embodiment, an air collection pipe 76 is also disposed in the vicinity of the upstream side depression chamber 20 in the depression pipe pipe 24, By connecting an air discharge pipe 77 disposed in the upstream side cover chamber 20, an air collection pipe disposed in the vicinity of the upstream side cover chamber 20 in addition to the air collection pipe 74 in the vicinity of the downstream side cover chamber 22. 76 allows the upstream compressed air to be collected and opened to the atmosphere.
[0066]
In particular, in this embodiment, the water 26 flowing down from the upstream pipeline 12 into the upstream cover chamber 20 is in a waterfall state, and bubbles are likely to be generated in the upstream cover chamber 20. Since compressed air is likely to be generated in the overpass 24, the compressed air in the vicinity of the upstream side overhanging chamber 20 is collected by the air collecting pipe 76 and opened to the atmosphere to ensure that the overlaid pipe The compressed air entering the tank 24 is discharged so as not to disturb the downstream water flow.
[0067]
The ends of the air collection pipes 74 and 76 opposite to the air discharge pipes 46 and 77 are closed, so that water cannot enter from here.
[0068]
Note that the air collection tubes 74 and 76 may be continuous and integrated.
[0069]
Other configurations and operations are the same as those of the above-described embodiments, and the description thereof is omitted.
[0070]
FIG. 8 is a view showing an exhaust structure in a pipeline according to the sixth embodiment of the present invention.
[0071]
In this embodiment, an intermediate vertical pipe 78 is arranged in the middle of the overpass pipe 24, and a horizontal pipe 80 is connected to the upper part of the intermediate vertical pipe 78. The water 26 is allowed to flow down in the vertical pipe 78 in a state where a waterfall is dropped.
[0072]
In this case, air bubbles 82 are likely to be generated by water falling in a fall state around the intermediate vertical pipe 78 of the overpass pipe 24, and therefore, on both sides near the intermediate vertical pipe 78 of the overpass pipe 24. An air collecting pipe 84 is disposed, and an air discharge pipe 86 disposed in the intermediate vertical pipe 78 is connected to the air collecting pipe 84 to reliably collect the compressed air generated in the vicinity of the intermediate vertical pipe 78. The air is discharged to the atmosphere above the intermediate vertical pipe 78.
[0073]
A manhole 88 is provided above the intermediate vertical pipe 78 and the upper end is closed by a lid 90.
[0074]
Further, in the figure, “X” indicates the rising range of the bubble 82, and the air collection tube 84 has a length that can cover at least the rising range “X”.
[0075]
The ends of the air collection pipes 84 opposite to the air discharge pipes 86 are in a closed state so that water cannot enter from here.
[0076]
Other configurations and operations are the same as those of the above-described embodiments, and the description thereof is omitted.
[0077]
The present invention is not limited to the embodiments described above, and can be modified into various forms within the scope of the gist of the present invention.
[0078]
For example, in the above-described embodiment, the exhaust structure in the sewer pipe has been described. However, the present invention is not limited to this example, and the exhaust in the pipe such as a storage pipe for storing rainwater, sewage or the like, or agricultural water is used. It can also be applied as a structure.
[0079]
Moreover, although the upper end of the air exhaust pipe is disposed in the manhole, the present invention is not limited to this example, and may be disposed outside the manhole, that is, on the ground.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an exhaust structure in a pipe line according to a first embodiment of the present invention.
2 is a cross-sectional view of the overturning pipe and the air collecting pipe of FIG. 1, and (2) is a plan view of the air collecting pipe.
FIG. 3 (1) is a cross-sectional view in which the air collecting pipe has a double pipe structure, (2) is a cross-sectional view in which air is collected at the air collecting partition wall, and (3) is It is sectional drawing which made the air collection partition wall the double structure, (4) is a top view which shows the state which formed the film | membrane for air collection in the air collection hole of the air collection pipe.
FIG. 4 is a cross-sectional view showing an exhaust structure in a pipe line according to a second embodiment of the present invention.
FIG. 5 is a sectional view showing an exhaust structure in a pipe line according to a third embodiment of the present invention.
FIG. 6 is a cross-sectional view showing an exhaust structure in a pipe line according to a fourth embodiment of the present invention.
FIG. 7 is a cross-sectional view showing an exhaust structure in a pipe line according to a fifth embodiment of the present invention.
FIG. 8 is a sectional view showing an exhaust structure in a pipe line according to a sixth embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Pipe line 12 Upstream side line 14 Downstream side line 16 Overlay pipe line 20 Upstream side cover room 22 Downstream side cover room 26 Water 42 Top part 44, 52, 66, 74, 76, 84 Air collection pipe 46, 86 Air exhaust pipe 48, 58, 60 Air collection hole 50 Air 70 Compressor 72 Pump

Claims (6)

An upstream pipe line provided at a high position on the upstream side, a downstream pipe line provided at a position lower than the upstream pipe line on the downstream side, and the upstream pipe line and the downstream pipe line. And an overpass pipe that has an overpass pipe connecting the lower ends of the upper and lower side overpass chambers extending downward and the upper and lower side overpass chambers,
In pipes that allow underground water flow from upstream to downstream due to water head differences,
The top of the said bend down over tube imaginary one end is closed, and the other end is opened, the air collection holes of several collecting the air contained in the water flowing through the facedown over tube imaginary wherein Arranging air collection means having along the axial direction of the underground pipe,
An air exhaust pipe having one end opened to the atmosphere is connected to the open end of the air collecting means,
An exhaust structure in a pipe, wherein the air contained in the water flowing through the overpass pipe is discharged to the atmosphere. In claim 1,
The exhaust structure in a pipe line, wherein the air collecting means is disposed in the vicinity of the downstream side overpass chamber in the overpass pipe. In claim 2,
The exhaust structure in a pipe line, wherein the air collecting means is also provided in the vicinity of the upstream side overpass chamber in the overpass pipe. In claim 1,
The exhaust structure in a pipe line, wherein the air collecting means is disposed over the entire length of the overpass pipe. In any one of Claims 1-4,
Exhaust air in a pipe line forcibly exhausting air in the air collecting means by a compressor provided on the upstream side of the air collecting means or a pump provided on an air exhaust pipe provided on the downstream side Construction. From an upstream pipe line provided at a high position on the upstream side to a downstream pipe line provided at a position lower than the upstream pipe line on the downstream side, via an overpass pipe having an overturn pipe An exhaust method in a pipeline that allows underground water flow due to a water head difference,
Is disposed on top of the said bend down over tube imaginary one end is closed, and the other end is opened, the air collection means having along an air collection holes in multiple in the axial direction of the saphenous over tube imaginary And collecting the air contained in the water flowing in the overpass pipe;
The air collecting means is connected to the open end of the air collecting means, and the air collected by the air collecting means is discharged to the atmosphere through an air discharge pipe having one end opened to the atmosphere. Exhaust method.

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