JP6069779B2 - Multi-layer sewer pipe - Google Patents

Description

  The present invention relates to a multi-layer sewer pipe, and more particularly, a multi-layer sewer pipe that can be used to construct a sewage treatment system that does not cause sewage to flow into a river or the sea in an emergency such as torrential rain using low cost. Regarding sewer pipes.

  As public sewers, “separated sewer” that drains rainwater caused by rainfall and sewage discharged from households through separate pipes, and sewage discharged from households and the like through the same pipe. There is a “joint sewer” that drains water. Conventionally, combined sewers have been mainly adopted because of the merit that the construction cost can be reduced compared to the sewer sewer and storm sewer.

  However, when it rains, mixed wastewater of rainwater and sewage flows into the combined sewer, and the mixed wastewater is generally intercepted and sent to the sewage treatment plant up to about 3 times the maximum sewage amount during the planned time. However, there was a problem with the combined sewerage system that the water quality of the river and the sea would deteriorate as a result.

In recent years, the mainstream of newly installed sewer pipes is a split-type sewer pipe, but it is difficult to replace all existing confluent sewer pipes, and a considerable amount of confluent sewer pipes are still in operation. This is the current situation.
Therefore, in the combined sewer system, a drainage pipe is provided to temporarily store the discharged water separated by the overflow weir, a sludge storage recess is provided inside the drainage pipe, and a sludge storage recess is provided from the inner wall of the pipe. The sludge contained in the discharge water in the drainage pipe is provided with an inclined surface that slopes downward toward the surface, a cover that covers the upper space of the sludge storage recess, and a sprinkling means that sprays water into the drainage pipe. A pollutant exclusion system that excludes pollutants such as the above has been proposed (see, for example, Patent Document 1). According to the pollutant elimination system described in Patent Document 1, the pollutant such as sludge contained in the discharge separated by the overflow weir in the combined sewer is eliminated, and the water quality of rivers and seas is deteriorated. Can be suppressed.

JP 2004-257225 A

  However, in the pollutant elimination system as described in Patent Document 1, it is necessary to divide the water by the overflow weir of the combined sewer, so that the configuration is complicated and expensive, and rainwater and sewage Since it is inevitable that a cloudy state occurs, the above-mentioned problems cannot be completely solved.

  Accordingly, an object of the present invention is to provide a sewage treatment system that can divert rainwater and sewage at a low cost with a simple structure, and can treat sewage without discharging it to rivers and seas in an emergency such as guerrilla heavy rain. It is to provide a multi-layer sewer pipe that can be constructed.

As a result of intensive studies to solve the above-mentioned problems, the present inventor can achieve the above-mentioned object by using a multi-layer system using an existing sewer pipe without embedding a new diversion sewer pipe. As a result, the present invention has been completed.
That is, the present invention is a multilayer sewer pipe in which a sewage pipe having a diameter smaller than that of the sewage pipe is laid in an existing sewage pipe in order to achieve the above object, and the sewage pipe does not require water purification treatment. The sewage pipe is connected to the storm water trough that stores the rainwater through the sewage pipe, and the sewage pipe is introduced through the sewage pipe to the sewage trough that stores the sewage that requires water purification treatment. The end point of the sewage pipe is located at the sewage treatment plant, and the sewage pipe is configured so that the end point can discharge the rainwater that has been transferred through the sewage pipe. A multi-layer sewer pipe is provided.

  According to the multi-layer sewer pipe according to the present invention, rainwater and sewage can be diverted with a simple structure at low cost, and can be treated without discharging sewage to rivers and seas even in emergency such as guerrilla heavy rain. A multi-layer sewer pipe capable of constructing a sewage treatment system can be provided.

It is a schematic diagram of a multilayer sewer pipe concerning an embodiment of the invention.

  FIG. 1 shows an outline of the configuration of a multilayer sewer pipe according to an embodiment of the present invention.

(Overview of multi-layer sewer pipe 1)
The multi-layer sewer pipe 1 according to the present embodiment has a merging pipe 10 as an existing sewage pipe and a diameter smaller than the diameter of the merging pipe 10 and along the axial direction of the merging pipe 10 in the merging pipe 10. And a diversion sewage pipe 20 as a sewage pipe to be laid. A public rainwater mass 30 as a rainwater mass for storing rainwater that does not require water purification treatment is connected to the junction pipe 10 via a rainwater introduction pipe 40. Further, in the diversion sewage pipe 20, a public sewage mass 32 as a sewage mass for storing sewage requiring water purification treatment is inserted through a sewage introduction pipe 42 inserted into the through hole 12 provided in the junction pipe 10. It is connected.

  A private sewage mass 34 is connected to the public sewage mass 32 via a connecting pipe 44. A private sewage mass 35 for storing sewage discharged from the house 50 is connected to the private sewage mass 34 via a connecting pipe 46. The private sewage mass 34 is located between the public sewage mass 32 and the private sewage mass 35. The private wastewater mass 35 includes a toilet wastewater mass 35a, a bathroom wastewater mass 35b, and a kitchen wastewater mass 35c.

  The sewage is transferred from the private sewage mass 35 through the private sewage mass 34 to the public sewage mass 32 and flows from the public sewage mass 32 into the diversion sewage pipe 20 through the sewage introduction pipe 42. Rain that falls on the surface of the road 60 or the like is stored in the public rainwater mass 30 as rainwater, and the rainwater stored in the public rainwater mass 30 flows into the junction pipe 10 through the rainwater introduction pipe 40. And the end point of the diversion sewer pipe 20 is installed so that it may be located in a sewage treatment plant, and the sewage which flows through the diversion sewer pipe 20 flows into the sewage treatment facility of a sewage treatment plant. On the other hand, the end point of the merging pipe 10 is configured such that rainwater transported through the merging pipe 10 is discharged into a river or the sea. That is, the inside of the merging pipe 10 is divided by the diverted sewage pipe 20 so that rainwater is transferred in the merging pipe 10 and sewage is transferred in the diverted sewage pipe 20.

  The sewage discharged from the house 50 includes sewage discharged from the toilet 52, sewage discharged from the bathroom 54, and sewage discharged from the kitchen 56. The sewage discharged from the toilet 52 is stored in the toilet sewage mass 35a, the sewage discharged from the bathroom 54 is stored in the bathroom sewage mass 35b, and the sewage discharged from the kitchen 56 is stored in the kitchen sewage mass 35c. Each sewage flows from the private sewage mass 35 to the private sewage mass 34.

  The sewerage system includes a public sewerage system 100 and a private drainage system 110 adjacent to the public sewerage system 100. The public sewerage system 100 is generally configured to include a multilayer sewer pipe 1, a public rainwater mass 30, and a public sewage mass 32. That is, the multilayer sewer pipe 1 according to the present embodiment is configured as a part of the public sewer system 100. The private drainage facility 110 is generally configured to include a private sewage mass 34 and a private sewage mass 35.

(Joint pipe 10)
As the junction pipe 10, the junction pipe 10 already laid under the road 60 is used. The merge pipe 10 according to the present embodiment is a cylindrical pipe. Each of the plurality of public rainwater masses 30 installed at predetermined positions such as the side of the road 60 is connected to the junction pipe 10 via a rainwater introduction pipe 40 connected to each of the plurality of public rainwater masses 30. Has been. The junction pipe 10 is provided with a through hole 12 into which the sewage introduction pipe 42 is inserted at a position corresponding to a place where the public sewage mass 32 is installed.

  Here, for example, (JSWAS A-1) of the Japan Sewerage Association standard is used as the junction pipe 10, and for example, a cylindrical pipe made of (reinforced concrete) having a diameter (300) mm is used. In the present invention, the present invention is preferably applicable to a merging pipe having a diameter of 400 mm or more. When passing the sewage introduction pipe 42 through the wall of the merging pipe 10, the through hole 12 having a diameter corresponding to the diameter of the sewage introduction pipe 42 is formed in the wall of the merging pipe 10. The through-hole 12 can be formed by, for example, making a hole in the joining pipe according to a conventional method in a state where the water flow is once stopped. Then, the sewage introduction pipe 42 is inserted into the formed through hole 12. Furthermore, for the purpose of preventing rainwater transported in the merging pipe 10 from leaking outside between the through hole 12 and the sewage introducing pipe 42, the merging pipe 10 and the sewage introducing pipe 42 in the through hole 12 It is preferable to prevent leakage by sealing the contact portion. Sealing can be performed by welding when both pipes are made of metal, and using a known sealant such as “Epto Sealer” manufactured by Nitto Denko Co., Ltd. when either is made of plastic.

(Diverted sewage pipe 20)
The diversion sewage pipe 20 is a cylindrical pipe having a diameter smaller than that of the merging pipe 10. The shunt sewage pipe 20 has a configuration capable of withstanding the pressure of sewage flowing inside the shunt sewage pipe 20 and the pressure of rainwater flowing outside the shunt sewage pipe 20 and inside the junction pipe 10. For example, a cylindrical pipe made of (reinforced concrete) having a wall thickness of (27) mm and a diameter of (200) mm can be used for the diverted sewage pipe 20. There are various sizes. Further, the inner wall of the diverted sewage pipe 20 can be subjected to a treatment for facilitating the transfer of the sewage, for example, a water repellent treatment.

  Moreover, the shunting sewage pipe 20 is laid, for example, in the approximate center of the lower part in the merging pipe 10. In some cases, the diverted sewage pipe 20 can be installed on the upper part or the side part of the merging pipe 10, but the structure becomes complicated, such as the need for a supporting member, so that it is provided in the lower part of the merging pipe as in this embodiment. Is preferred. When the diversion sewage pipe 20 is laid in the merging pipe 10, working holes (manhole holes, not shown) provided at predetermined intervals along the axial direction of the merging pipe 10 are used. First, the parts of the divided sewage pipe 20 divided into predetermined lengths are carried into the merging pipe 10 from the holes. Next, each part is connected in the junction pipe 10. And the shunting sewage pipe | tube 20 comprised by connecting each part is laid in the joining pipe | tube 10. FIG. Further, a sewage introduction pipe 42 is connected to a predetermined position of the diversion sewage pipe 20.

  When connecting the parts of the diverted sewage pipe 20, the parts are connected to each other by welding in the case of metal, or by using a connecting pipe in the case of plastic. 20 to prevent sewage from leaking outside. Moreover, although the shunting sewage pipe 20 may be laid without being fixed as it is, it may be fixed to the merging pipe 10 using a fixing member although not particularly shown.

(Sewage introduction pipe 42)
The sewage introduction pipe 42 connects the shunt sewage pipe 20 and the public sewage mass 32 in the ground. Therefore, the sewage introduction pipe 42 needs to have a structure that is not easily damaged by pressure applied from the outside in the ground. A part of the sewage introduction pipe 42 is inserted into the junction pipe 10. There is a case where a large amount of rainwater flows in the junction pipe 10, and the sewage introduction pipe 42 needs to have a strength capable of withstanding a flow due to a large amount of rainwater.

Therefore, for example, as the sewage introduction pipe 42, cylindrical pipes made of hard vinyl chloride having various shapes such as a wall thickness of 5 to 9 mm and an outer diameter of, for example, 165 mm can be used. And it connects using welding or a sealant agent, or connects using a well-known connection member, connects the public sewage mass 32 and one end of the sewage introduction pipe 42, and connects the other end of the sewage introduction pipe 42. The end and the diverted sewage pipe 20 can be connected. Each connection area can be sealed with a sealant so that sewage does not leak to the outside. Furthermore, various treatments can be applied to the region including the contact portion between the sewage introduction pipe 42 and the merging pipe 10 for the purpose of reducing the pressure caused by running water. Specifically, the roughness outside the pipe is reduced. Such treatment or water repellent treatment may be performed.
Further, a shock absorbing material such as rubber packing which is not easily deteriorated can be installed between the through hole and the attached sewage pipe to reduce the force applied to the sewage introduction pipe in the vicinity of the through hole.

  In addition, the slope of the sewage introduction pipe 42 with respect to the horizontal plane is set to 10 ‰ (10/1000) or more so that the sewage is appropriately transferred from the public sewage mass 32 to the diversion sewage pipe 20, and the merging pipe 10 using a curved pipe or the like. It is attached at right angles and straight lines to the diverted sewage pipe. (This ratio is not particularly determined, the mounting pipe is determined as the diameter of the household sewage flowing without stagnation, and the diversion sewage pipe may be appropriately selected as the diameter of the sewage in the area in charge without stagnation. For pipe dredging, in principle, the pipe diameter should be such that the minimum flow velocity is 0.6 m / sec or more and 3.0 m / sec with respect to the planned sewage volume. The pipe diameter is preferably m / sec or more and 3.0 m / sec.Since the amount of sewage increases in the downstream, the pipe dredging becomes larger, and the flow rate increases even if the slope is gentle, so the speed of this movement is secured. It is only necessary to have a pipe diameter that can be used.) Further, the inner wall of the sewage introduction pipe 42 can be subjected to water repellent treatment so that the sewage can easily flow.

(Public rainwater mass 30, public wastewater mass 32, private wastewater mass 34, private wastewater mass 35)
As the public rainwater mass 30, for example, a mass having a mud pool so that mud mixed in rainwater does not flow into the junction pipe 10 can be used. In addition, as the public sewage mass 32, the private sewage mass 34, and the private sewage mass 35, for example, an invert mass in which filth does not stay in the mass can be used.

(Effect of embodiment)
Since the multi-layer sewer pipe 1 according to the present embodiment lays the diverted sewage pipe 20 in the existing merging pipe 10, it is not necessary to lay the diverted sewage pipe 20 in the ground separately from the merging pipe 10. Thereby, in order to divert wastewater and rainwater, a new road is excavated, and it is possible to divert rainwater and wastewater with a simple structure without requiring a space for the diversion wastewater pipe 20. Construction cost can be reduced. Moreover, since the shunting sewage pipe 20 is laid in the junction pipe 10, it can be easily constructed even when the road is narrow or when other buried objects such as gas pipes and water pipes exist.

Further, in the multi-layer sewer pipe 1, the merge pipe 10 and the divided sewage pipe 20 are isolated from each other, and only the sewage flowing through the divided sewage pipe 20 can be treated in the sewage treatment plant. Accordingly, the sewage can be reliably transferred to the sewage treatment plant, and the treatment capacity of the sewage treatment plant can be reduced as compared with the case where sewage and rainwater are treated together. Therefore, even when a large amount of rainwater flows into the merge pipe 10 due to heavy rain or guerrilla heavy rain, the rainwater that flows in is not discharged into the river or the sea without being mixed with the sewage. Can be prevented from being discharged into the water.
In addition, there is no need to purchase new land, especially when laying a trunk sewage pipe with a large diameter, which has almost no mounting pipe, in the trunk merging pipe rather than the end that collects sewage from each household in the sewage pipe. Since pipes can be laid, this is effective.
The sewage introduction pipe 42 may be the sewage introduction pipe 42 in the merging pipe 10 on the upstream side of the sewer (the side into which domestic sewage flows), but on the downstream side (the side where the sewage sewage pipe is concentrated). In this case, it is preferable that the shunt sewage pipe is adjacent to the inner surface of the merging book 10 so that the sewage introduction pipe 42 does not exist in the merging pipe 10.

  While the embodiments of the present invention have been described above, the embodiments described above do not limit the invention according to the claims. Various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Multi-layer sewer pipe 10 Joint pipe 12 Through-hole 20 Divided sewage pipe 30 Public rainwater mass 32 Public sewage mass 34 Private sewage mass 35 Private sewage mass 35a Toilet sewage mass 35b Bathroom sewage mass 35c Kitchen sewage mass 40 Rainwater introduction pipe 42 Wastewater introduction pipe 44, 46 Connecting pipe 50 Housing 52 Toilet 54 Bathroom 56 Kitchen 60 Road 100 Public sewerage equipment 110 Private drainage equipment

Claims (1)

A multi-layer sewer pipe in which a cylindrical sewage pipe having a diameter smaller than that of the sewage pipe is laid at the approximate center of the lower part in the sewage pipe ,
The sewage pipe is connected to a rainwater mass for storing rainwater that does not require water purification treatment via a rainwater introduction pipe.
The sewage pipe is connected to a sewage mass storing sewage that needs water purification treatment through a sewage introduction pipe provided through the sewage pipe,
The sewage pipe has its end point located at the sewage treatment plant,
The above sewage pipe is designed to discharge rainwater whose end point has been transferred through the sewage pipe ,
The slope of the sewage introduction pipe with respect to the horizontal plane is 10% (10/1000) or more,
The sewage inlet pipe, passed through a linear relative sewers, multilayer sewer pipe mounted at a right angle and linearly with respect to the circumferential direction normal of dirty water pipe.

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