JP2011220106A - Inverted siphon structure of sewage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure for effective removal of an adhered or deposited contaminant in a vent tube with lower workload and cost.SOLUTION: A first opening hole and a second opening hole are formed in a channel of a downward flow section that constitutes an inlet of a vent tube. Once a year, compressed air is supplied via first and second air tubes for approximately 3 to 8 minutes. The compressed air supplied from the first and the second air tubes whirls and agitates sewage both in axial and circumferential directions. The whirled and agitated flow serves to effectively pulverize a sedimentation layer of suspended contaminants deposited around the water level of the downward flow section so as to be forcibly flown away.

Description

  The present invention relates to an underground structure for sewage that passes under obstacles such as rivers and underground passages, and more particularly to an underground structure provided with a means for removing contaminants adhering to or accumulating in a passage.

  Sewage, such as domestic household wastewater and industrial facility wastewater, is drained by a separate sewer pipe, but if there are obstacles such as rivers or underpasses in the middle of the flow path, it will be submerged under these obstacles. An overturning structure with a vent pipe is provided. FIG. 11 shows a typical overlaid structure according to the prior art. That is, the upstream side sewage pipe 305 and the downstream side sewage pipe 306 sandwiching the river are connected by the vent pipe 301 that goes under the river. The vent pipe 301 includes, in order from the inlet side, a downward flow portion 311 that is inclined downward, a horizontal flow portion 312 that communicates with the downward flow portion and passes under the obstacle substantially horizontally, and the horizontal flow portion 312. And an upward flow portion 313 that communicates with the flow portion and is inclined upward.

  An upstream manhole 303 is provided between the upstream sewage pipe 305 and the vent pipe 301, and a downstream manhole 304 is provided between the downstream sewage pipe 306 and the vent pipe. The outlet of the upstream sewage pipe 305 and the inlet of the vent pipe 301 communicate with the bottom of the upstream manhole 303, and the outlet of this vent pipe and the inlet of the downstream sewage pipe 306 are respectively downstream manholes. It communicates with the bottom of 304. The bottom of the cross section of the upstream sewage pipe at the position where the upstream sewage pipe 305 communicates with the upstream manhole 303 and the downstream sewage pipe at the position where the downstream sewage pipe 306 communicates with the downstream manhole 304. An underlay drop ΔH corresponding to the head loss of the overpass path is provided between the bottom of the cross section, and sewage is caused to flow into the vent pipe 301 by the hydrostatic pressure of the sewage based on the drop.

  However, sewage, which is domestic wastewater, is mixed with floating impurities such as oil and sedimentary impurities such as earth and sand. On the other hand, the sewerage system is designed so that it always has twice the capacity of the planned sewerage. For this reason, as shown in FIG. 12, when the amount of sewage is small, the sewage is not filled in the downward flow portion 311 and the water level of the downward flow portion becomes low, and the above-described overhead drop ΔH can be secured. It will disappear. For this reason, the hydrostatic pressure that pushes down the sewage is low, and the small amount of sewage overlaps, so that floating impurities such as oil mixed in the sewage float and accumulate on the water surface of the downward flow part 311 and stay for a long time. To do. For this reason, when floating impurities such as oil are mixed in a large amount in the sewage, the floating impurities are enlarged and solidified in the vicinity of the water surface of the downward flow portion 311 to form the deposition layer S. To do. Furthermore, combined with the fact that the falling force of the sewage is reduced by the deposited layer S, the deposited layer S eventually closes the vent pipe.

  For this reason, as means for removing the sedimentary layer S of floating contaminants, means for periodically cleaning the vent pipe 301 by using pressure water, a suction pump or the like is used. However, with this means, it is necessary to monitor and inspect the adhesion and accumulation state of floating impurities, clean up work at midnight with a small amount of sewage flow, and prepare cleaning equipment such as an electric motor. Moreover, since the deposits and the like taken out by cleaning become industrial waste, a burden of this disposal occurs. Therefore, a large amount of work and cost are required for maintenance of the overturn structure.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a sewage overhanging structure that can effectively remove foreign substances adhering or accumulating in a vent pipe with a small amount of work and cost.

  In order to solve the above-described problems, the sewage overhang structure according to the present invention is characterized by being compressed for a predetermined time every predetermined period in the flow path of the downward flow portion constituting the inlet portion of the vent pipe. By supplying air, the foreign matter adhering or depositing near the water surface of the downward flow portion is crushed and removed by flowing down. That is, the underground structure of sewage according to the present invention includes a vent pipe that passes under an obstacle such as a river or an underground passage, and a contaminant removal means that removes contaminants attached or deposited in the vent pipe. The vent pipe includes, in order from the inlet side, a downward flow portion that is inclined downward, a horizontal flow portion that communicates with the downward flow portion, and that substantially underlies the obstacle, and the horizontal flow portion. And an upward flow portion inclined upward.

  The foreign matter removing means has a first opening hole that opens to the downward flow portion, and a first air pipe that communicates with the first opening hole. It is a position below the overlying water level of the downward flow portion, and is open to the top of the flow path cross section of the downward flow portion. Then, from the first opening hole, through the first air pipe, toward the center of the flow path of the downward flow portion and toward the downstream direction of the downward flow portion, every predetermined period. Compressed air is supplied for a predetermined time.

  The contaminant removing means includes a second opening hole that opens to the downward flow portion, and a second air pipe that communicates with the second opening hole. It is a lower position spaced apart from the first opening hole by a predetermined distance and opens in the lower half portion of the flow path cross section of the downward flow portion, and from the second opening hole through the second air pipe. The compressed air is supplied for a predetermined time every predetermined period in the circumferential direction of the flow path of the downward flow portion and in the upstream direction of the downward flow portion. It is desirable.

  The foreign matter removing means has a third opening hole that opens to the upward flow part, and a third air pipe that communicates with the third opening hole. From the communicating portion between the horizontal flow portion and the upward flow portion, the upper position is spaced a predetermined distance, and opens to the lower half of the cross section of the flow path of the upward flow portion, from the third opening hole. It is more desirable that the compressed air is supplied into the flow path of the upward flow portion for a predetermined time every predetermined period via the third air pipe.

  An upstream manhole communicating with the inlet of the downward flow portion, a ventilation path communicating with the upstream manhole, and a deodorizing device communicating with the ventilation path, and the air in the upstream manhole passes through the ventilation path. It is desirable to configure so that it communicates with the ground surface via the deodorizing device.

  More preferably, an upstream manhole communicating with the inlet of the downward flow portion is provided, and the compressed air is configured to be air compressed by sucking air in the upstream manhole.

  Here, the “behind-behind water level of the downward flow portion” means the position of the water surface in the downward flow portion when no sewage flows, that is, the bottom position of the cross section of the downstream sewage pipe communicating with the downstream portion of the vent pipe Means the altitude corresponding to. “For a predetermined period of time every predetermined period” is desirably about 3 to 8 minutes once a year. This is because the frequency of cleaning the conventional vent pipe is statistically most frequently once a year. However, depending on the type and amount of floating contaminants contained in the sewage, the diameter of the vent pipe, the size of the heading drop, etc., the period may be shortened to 2-4 times a year, or 2-4 years It may be extended to about once. The supply of compressed air is desirable in winter. Since the sewage temperature is low in winter, the coagulation power of the oily substance contained in the floating contaminant increases, and this floating contaminant becomes more enlarged and solidified, and the vent pipe is likely to be blocked. is there. Therefore, supply of compressed air in winter can effectively prevent the vent pipe from being blocked. The “predetermined time” is not limited to about 3 to 8 minutes, and may be shortened or extended as in the “predetermined period” described above. “Compressed air” is preferably about 1 to 2 atmospheres (gauge pressure), but the air pressure may be further increased depending on the amount and properties of floating contaminants, the diameter of the vent pipe, and the like.

  From the first opening hole that is located below the overlying water level of the downward flow portion and that opens at the top of the flow path cross section of the downward flow portion, the downward flow is passed through the first air pipe. Near the water surface of the downward flow portion by supplying compressed air for a predetermined time every predetermined period toward the center of the flow path of the flow portion and in the downstream direction of the downward flow portion It is possible to effectively pulverize floating contaminants floating, deposited or adhering to the surface with the compressed air, and to easily flow down the pulverized floating contaminants. The first opening hole is opened at the top of the flow path cross section of the downward flow portion, and the compressed air is directed toward the center of the flow path of the downward flow portion and in the downstream direction of the downward flow portion. The reason why the air is supplied toward is not only to pulverize floating impurities with compressed air, but also to facilitate the pulverized floating impurities to be washed away in the downstream direction by the jet power of the compressed air.

  Furthermore, the flow of the downward flow portion is lower than the first opening hole from the second opening hole that is opened at the lower half portion of the flow path cross section of the downward flow portion at a predetermined distance. Compression supplied from the first opening hole by supplying compressed air for a predetermined time every predetermined period in the circumferential direction of the road and in the upstream direction of the downward flow portion. In conjunction with the air, sewage is swirled in both the axial direction and the circumferential direction in the downward flow portion, and the swirl flow causes floating, accumulation, or adhesion near the water surface of the downward flow portion. It is possible to pulverize more effectively while stirring floating impurities.

  Further, in the upward flow portion located on the downstream side of the vent pipe, the upper flow portion is separated from the communicating portion between the horizontal flow portion and the upward flow portion by a predetermined distance, and the flow path cross section of the upward flow portion By pulverizing in the downward flow portion by supplying compressed air into the flow path of the upward flow portion for a predetermined time from the third opening hole opened in the lower half portion of the upper half portion Suspended impurities can flow down more effectively. That is, when compressed air is supplied to a floating contaminant that has been crushed in the downward flow portion and has reached the upward flow portion, the specific gravity of the floating contaminant mixed with air becomes light. For this reason, floating impurities mixed with air are likely to float in the upward flow portion, and more easily flow down to the downstream sewage pipe located on the downstream side. Moreover, since the volume of the fluid flowing in the upward flow portion is increased by mixing the air, the flow velocity in the upward flow portion is increased. For this reason, the pulverized floating impurities can flow down more effectively.

  An upstream manhole that communicates with the inlet of the downward flow portion, a ventilation path that communicates with the upstream manhole, and a deodorizing device that communicates with the ventilation path. By communicating with the surface of the earth via the deodorizing device, it is possible to prevent the off-flavor etc. generated when pulverizing floating impurities from leaking outside the surface of the earth. In other words, floating contaminants are pulverized by compressed air supplied into the vent pipe. Therefore, after the impurities are pulverized, it is necessary to finally release the air corresponding to the amount of supplied air to the outside of the ground surface. . However, the air after pulverizing the floating contaminants is in a state in which the odor of the contaminants is mixed, and if it is allowed to flow out of the ground surface as it is, there is a risk of pollution problems. Therefore, by providing an upstream manhole communicating with the inlet of the downward flow section, collecting air mixed with odor etc. in this upstream manhole, and letting this air escape to the ground surface through a deodorizing device. Odor can be prevented from leaking outside.

  In addition, it has an upstream manhole communicating with the inlet of the downward flow section, and is configured to supply compressed air that is sucked and compressed in the upstream manhole, so to speak, air that crushes floating impurities Can be circulated without communicating with the outside of the surface of the earth, and odor can be prevented from leaking outside of the surface of the earth.

It is a schematic sectional drawing of the underground structure of a sewer pipe. It is a schematic sectional drawing which shows the structure of a contaminant removal means. It is an expanded sectional view showing composition of the 1st opening hole and the 1st air pipe. It is another expanded sectional view which shows the structure of a 1st opening hole and a 1st air pipe. It is an expanded sectional view showing the composition of the 2nd opening hole and the 2nd air pipe. It is another expanded sectional view which shows the structure of a 2nd opening hole and a 2nd air pipe. It is a schematic sectional drawing which shows the structure of a 3rd opening hole and a 3rd air pipe. It is an expanded sectional view showing the composition of the 3rd opening hole and the 3rd air pipe. It is a schematic sectional drawing which shows the structure of the contaminant removal means provided with a deodorizing apparatus. It is a schematic sectional drawing which shows the structure of the contaminant removal means which circulates and uses the air in an upstream manhole. It is a schematic sectional drawing of the underground structure of the sewer pipe by a prior art example. It is a partial expanded sectional view of the underground structure of the sewer pipe by a prior art example.

  The underlay structure according to the present invention will be described with reference to FIGS. As shown in FIG. 1, the overturning structure according to the present invention includes a vent pipe 1 that passes under a river, and a contaminant removal means 2 that removes contaminants attached or deposited in the vent pipe. The vent pipe 1 includes, in order from the inlet side, a downward flow portion 11 that is inclined downward, a horizontal flow portion 12 that communicates with the downward flow portion and that runs under the river almost horizontally, and the horizontal flow portion. And an upward flow portion 13 that is inclined upward.

  An upstream manhole 3 is provided at the inlet of the vent pipe 1, and a downstream manhole 4 is provided at the outlet of the vent pipe, and an upstream sewage pipe 5 and a downstream side are provided at the bottom of each vent pipe 1. The sewer pipe 6 communicates. Further, the bottom of the cross section of the upstream sewage pipe at the position where the upstream sewage pipe 5 communicates with the upstream manhole 3 and the downstream sewage pipe at the position where the downstream sewage pipe 6 communicates with the downstream manhole 4. Between the bottom of the cross section, an overhead drop ΔH corresponding to the loss head of the overpass path is attached.

  As shown in FIGS. 1 and 2, the contaminant removing means 2 includes a first opening hole 21 that opens in the downward flow portion 11, and a first air pipe 22 that communicates with the first opening hole. have. The first opening hole 21 is spaced from the overlying water level of the downward flow portion 11, that is, the horizontal position serving as a reference for the underflow drop ΔH, with an interval corresponding to approximately 1/3 of the tube diameter of the downward flow portion. It is a lower position and is open to the top of the cross section of the flow path of this downward flow portion. The contaminant removing means 2 has a second opening hole 23 that opens to the downward flow portion 11 and a second air pipe 24 that communicates with the second opening hole. Is a lower position spaced apart from the first opening 21 by a predetermined distance, and is open in the lower half of the flow path cross section of this downward flow portion.

  Here, the interval between the first opening hole 21 and the second opening hole 23 is desirably set larger as the pipe diameter of the vent pipe 1 becomes smaller. For example, when the pipe diameter of the vent pipe 1 is 150 mm, the pipe diameter is about three times, and when the pipe diameter is 200 mm, the pipe diameter is about 2.5 times the pipe diameter and the pipe diameter is 250 mm. Sets an interval corresponding to approximately twice the tube diameter, and if the tube diameter is 300 mm or more, sets an interval corresponding to approximately twice the tube diameter. That is, as will be described later, floating impurities accumulated near the inlet of the vent pipe 1 generate a swirling flow by compressed air ejected from the first opening hole 21 and the second opening hole 23. Stir and repeatedly grind many times. However, when the pipe diameter of the vent pipe 1 is small and the cross-sectional area is narrow, floating impurities accumulate from the water surface of the vent pipe 1 to a deeper position. Therefore, when the pipe diameter of the vent pipe 1 is small, the gap between the first opening hole 21 and the second opening hole 23 is set large in order to pulverize the floating impurities accumulated to a deeper position. .

  As shown in FIG. 2 and FIG. 7, the contaminant removing means 2 further includes a third opening hole 25 that opens in the upward flow portion 13 that forms the downstream side of the vent pipe 1, and the third opening hole. A third air pipe 26 that communicates with the horizontal flow section 12 of the vent pipe and a communication section between the horizontal flow section 12 of the vent pipe and the upstream flow section. An interval corresponding to approximately 1/3 of the diameter is set.

  As shown in FIG. 2, the first air pipe 22, the second air pipe 24, and the third air pipe 26 are embedded along the vicinity of the outer wall of the vent pipe 1. The sections are connected to an air distribution device 27 provided in the upstream manhole 3, respectively. The air distribution device 27 includes a pneumatic inlet valve 27a that allows the compressed air supplied from the air compressor A to flow in and stop, a first air pipe 22, a second air pipe 24, and a third air pipe. Three air adjustment cocks 27b for individually and independently adjusting the amount of compressed air supplied to the air pipe 26 are provided. The air compressor A is movable and is placed outside the ground surface near the upstream manhole 3. Compressed air is supplied from the air compressor A to the pneumatic inlet valve 27a via the compressed air supply pipe 27c.

  With reference to FIG. 3 and FIG. 4, the configuration of the first opening hole 21 opened in the downward flow portion 11 and the first air pipe 22 communicating with the first opening hole will be described in detail. The first air pipe 22 has, for example, a vinyl chloride pipe 22a having an inner diameter of approximately 13 mm, a vinyl chloride pipe elbow 22b having a bending angle of 130 to 160 degrees provided at the tip thereof, and an inner diameter inserted into the vinyl chloride pipe. It has a urethane hose 22c of approximately 6 mm and an outer diameter of approximately 10 mm, and a tip fitting 22d provided at the tip of this urethane hose. A through hole is provided in the center of the tip fitting 22d, and an outlet opening portion of the through hole constitutes the first opening hole 21.

  The distal end portion of the vinyl chloride pipe elbow 22b is mounted on the inner wall of the downward flow portion 11 so that there is no step, and the distal end portions of the urethane hose 22c and the distal end fitting 22d are also separated from the inner wall of the downward flow portion 11. It is set not to jump out. As shown in FIG. 3, the compressed air is ejected from the first opening hole 21 toward the downstream direction of the downward flow portion 11. Further, as shown in FIG. 4, the compressed air is ejected from the first opening 21 toward the center of the flow path of the downward flow portion 11.

  With reference to FIGS. 5 and 6, the configuration of the second opening hole 23 opened in the downward flow portion 11 and the second air pipe 24 communicating with the second opening hole will be described in detail. The second air pipe 24 has, for example, a vinyl chloride pipe 24a having an inner diameter of approximately 13 mm, a vinyl chloride pipe elbow 24b provided at the tip thereof and a bending angle of approximately 60 degrees, and an inner diameter inserted into the vinyl chloride pipe. The urethane hose 24c has an outer diameter of 6 mm and an outer diameter of approximately 10 mm, and a tip metal fitting 24d provided at the tip of the urethane hose. A through hole is provided in the center of the tip fitting 24d, and an outlet opening portion of the through hole constitutes a second opening hole 23.

  The distal end portion of the vinyl chloride pipe elbow 24b is mounted on the inner wall of the downward flow portion 11 so that there is no step, and the distal end portions of the urethane hose 24c and the distal end fitting 24d are also separated from the inner wall of the downward flow portion 11. It is set not to jump out. As shown in FIG. 5, the compressed air is ejected from the second opening hole 23 toward the upstream direction of the downward flow portion 11. As shown in FIG. 6, the compressed air is ejected from the second opening hole 23 in the circumferential direction of the flow path of the downward flow portion 11.

  The configuration of the third opening hole 25 that opens to the upward flow portion 13 and the third air pipe 26 that communicates with the third opening hole will be described in detail with reference to FIGS. 7 and 8. The third air pipe 26 has, for example, a vinyl chloride pipe 26a having an inner diameter of approximately 13 mm, a vinyl chloride pipe elbow 26b provided at the tip of the pipe, and an inner diameter inserted into the vinyl chloride pipe. The urethane hose 26c has an outer diameter of 6 mm and an outer diameter of approximately 10 mm, and a tip metal fitting 26d provided at the tip of the urethane hose. A through hole is provided in the center of the tip fitting 26d, and an outlet opening portion of the through hole constitutes a third opening hole 25. The third air pipe 26 is embedded along the vicinity of the vent pipe 1 in the same manner as the first air pipe 22 and the second air pipe 24. That is, in order to prevent damage or the like by preventing the relative position with respect to the vent pipe 1 from shifting with respect to an earthquake or ground subsidence.

  The distal end portion of the vinyl chloride pipe elbow 26b is mounted on the inner wall of the upward flow portion 13 so that there is no step, and the distal end portions of the urethane hose 26c and the distal end fitting 26d are also separated from the inner wall of the upward flow portion 13. It is set not to jump out. As shown in FIG. 8, the compressed air is ejected from the third opening hole 25 toward the center of the flow path of the upward flow portion 13 so as to be orthogonal to the flow path.

  Next, another embodiment will be described with reference to FIGS. 9 and 10. For ease of reference, the components shown in FIG. 9 are equivalent to the component numbers obtained by adding 100 to the component numbers of the components described above, and the components shown in FIG. Is a part number with a uniform 200 added. The underlay structure shown in FIG. 9 communicates with the upstream manhole 103 communicating with the inlet of the downward flow portion 111, the deodorizing device 128 embedded in the vicinity of the upstream manhole, and the upstream manhole and the deodorizing device. And a first ventilation path 128a. A second ventilation path 128 b communicates with the top of the upstream sewage pipe 105 located upstream of the upstream manhole 103, and the other end of the second ventilation path communicates with the deodorizing device 128. ing.

By the way, since the upstream manhole 103 is generally buried under a public road, it may be an obstacle to traffic to open the lid and perform a cleaning operation or the like. In such a case, a water pipe hand hole 129 or the like is provided at a point that does not hinder road traffic, and an air distribution device 127 is attached in the hand hole.

  The deodorizing device 128 is buried in the soil above the groundwater level, and crushed stone and soil deodorizing material are housed inside. The upper cover of the deodorizing device 128 is provided with a vent hole. Therefore, air containing odors due to pulverization of airborne contaminants gathers in the upstream manhole 103 and on the water surface of the upstream sewage pipe 105. This air is collected in the first ventilation path 128a and the second air passage 128a. By discharging to the ground surface through the ventilation path 128b and the deodorizing device 128, it is possible to prevent the odor from leaking to the outside.

  Next, in the overturning structure shown in FIG. 10, the air distribution device 227 is provided in the upstream manhole 203 communicating with the inlet of the downward flow portion 211. Here, the compressor A sucks and compresses the air in the upstream manhole 203 through the air suction pipe 227d, and compresses the compressed air into the upstream manhole through the compressed air supply pipe 227c. It supplies to the provided air distribution apparatus 227. In FIG. 9, the deodorizing device 128 is removed, the air in the upstream manhole 103 is sucked and compressed through the first ventilation path 128 a and the second ventilation path 128 b, and the compressed air is supplied to the air distribution device 127. You may comprise. Further, with respect to the air protruding from the third air pipe 26 to the upward flow portion 13, if the odor should be prevented from leaking to the outside, the air in the downstream manhole 4 in FIG. It is good also as compressing and feeding to the air distribution apparatus 127. In the case of a large river where the distance between the upstream manhole 103 and the downstream manhole 4 is large, the water pipe handhole 129 and the air distribution device 127 are applied in the vicinity of the downstream manhole 4. A device may be attached, and the air in the downstream manhole 4 may be sucked and compressed by a separate ventilation path and supplied to the third air pipe 26.

  Therefore, by sucking the air in the upstream manhole 203 and supplying the compressed air, compressed air can be circulated without communicating with the outside of the ground surface. Thus, odor can be prevented from leaking outside the surface of the earth.

  In the configuration shown in FIG. 2, when removing the sediment layer S of floating impurities, an air distribution pipe 27 c that supplies compressed air from the compressor A is provided in the upstream manhole 3. It is necessary to connect to the device 27. In such a case, when the lid of the upstream manhole 3 is opened, the odor in the upstream manhole leaks to the outside. Therefore, when odor countermeasures are required, the upstream manhole 3 is covered with a sheet of vinyl chloride or the like to prevent the odor in the upstream manhole 3 from leaking to the outside.

  The air distribution device 27 and the like are not limited to being provided in the upstream manhole 3, but are provided in the downstream manhole 4, and the air distribution device provided in the downstream manhole 4 includes the first air pipe 22 and the like. The second air pipe 24 and the third air pipe 26 and the like can be easily communicated. In such a case, the deodorizing device 128 and the handhole 129 can be easily configured to be embedded in the vicinity of the downstream manhole 4.

  If the vent pipe 1 has a small diameter of Φ150 mm, and there is no factory, office, restaurant, etc. that discharges fats and oils upstream from the overturning structure, the first opening hole Only the first air pipe 22 and the like may be provided, and the second opening hole 23 and the second air pipe 24 and the like may be omitted. Further, compressed air is supplied to the first air pipe 22 and the like and the second air pipe 24 and the like via an air distribution device 27 and the like provided in the upstream manhole 3 and the like, and the third air pipe 26 and the like are supplied. Can be easily configured such that another air distribution device is provided in the downstream manhole 4 and the like, and compressed air is supplied through this air distribution device.

  The first air pipe 22, etc., the second air pipe 24, etc., the third air pipe 26, etc. are not limited to being attached to the outer edge of the vent pipe 1 etc. It is also possible to easily construct a structure that traverses alone or communicates with an existing river bridge. Furthermore, the sewage overhang structure described above is mainly suitable for a shunting sewer pipe, but is not limited to this shunting pipe, and can also be applied to a sewer pipe that joins rainwater or the like. In addition, the above-described contaminant removal means 2 can be easily added to the existing underlay structure. The compressed air can be easily mixed with gas or liquid having a cleaning effect.

  It can be widely used in industries related to the underground structure of sewer pipes.

DESCRIPTION OF SYMBOLS 1,301 Vent pipe 11,111-311 Downflow part 12,312 Horizontal flow part 13,313 Upflow part 2 Contaminant removal means 21 1st opening hole 22,122,222 1st air pipe 23 1st 2 opening holes 24, 124, 224 2nd air pipe 25 3rd opening hole 26, 126, 226 3rd air pipe 3, 103-303 Upstream manhole 4, 304 Downstream manhole 5, 105-305 Upstream Side sewer pipe 6, 306 Downstream sewer pipe 128 Deodorizer 128a First ventilation path (venting path)
128b Second ventilation path (venting path)

Claims (5)

A vent pipe that penetrates under obstacles such as rivers and underpasses, and a contaminant removal means for removing contaminants that adhere to or accumulate in the vent pipe,
The vent pipe includes, in order from the inlet side, a downward flow portion that is inclined downward, a horizontal flow portion that communicates with the downward flow portion, and that substantially underlies the obstacle, and the horizontal flow portion. And an upward flow portion that is inclined upwardly in communication with
The contaminant removal means has a first opening hole that opens to the downward flow portion, and a first air pipe that communicates with the first opening hole,
The first opening hole is located at a position below the overlying water level of the downward flow portion, and is opened at the top of the flow path cross section of the downward flow portion,
From the first opening hole through the first air pipe, toward the center of the flow path of the downward flow portion and toward the downstream direction of the downward flow portion, at predetermined intervals. The sewage overhang structure is characterized in that compressed air is supplied during the period of time. In Claim 1, the said contaminant removal means has the 2nd opening hole opened to the said downward flow part, and the 2nd air pipe connected to this 2nd opening hole,
The second opening hole is a lower position spaced apart from the first opening hole by a predetermined distance, and opens in the lower half of the flow path cross section of the downward flow portion,
From the second opening hole, through the second air pipe, in the circumferential direction of the flow path of the downward flow portion and in the upstream direction of the downward flow portion, at predetermined intervals. The sewage overhang structure is characterized in that compressed air is supplied during the period of time. 3. The foreign matter removing means according to claim 1, wherein the foreign matter removing means includes a third opening hole that opens to the upward flow portion, and a third air pipe that communicates with the third opening hole. ,
The third opening hole is an upper position spaced a predetermined distance from the communicating portion between the horizontal flow portion and the upward flow portion, and is opened in the lower half portion of the flow path cross section of the upward flow portion. And
Compressed air is supplied from the third opening hole through the third air pipe into the flow path of the upward flow portion for a predetermined time every predetermined period. Overlay structure. In any one of Claims 1 thru / or 3, It is provided with the upstream manhole which is open for free passage to the entrance of the above-mentioned downward flow part, The ventilation course connected to this upstream manhole, The deodorizing device connected to this ventilation course,
The sewage overhang structure, wherein the air in the upstream manhole communicates with the ground surface through the ventilation path and the deodorizing device. In any one of Claims 1 thru | or 3, It is equipped with the upstream manhole connected to the inlet of the said downward flow part,
The above-mentioned compressed air is the air compressed by sucking the air in the above-mentioned upstream manhole.

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