JP2011127332A - Vertical pipe with spiral guide passage - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vertical pipe with spiral guide passages capable of reducing the velocity of a sewage when the sewage flowing down in the form of swirl flow by the spiral guide passages is discharged from an outlet by reducing an entraining air volume in the stable flow state irrespective of the flow rate by a simple structure in which a manhole is not increased in size. <P>SOLUTION: This vertical pipe 2 connects an upper sewage pipe 4 and a lower sewage pipe 5, and allows the sewage to flow down spirally by the spiral guide passages 21, 23 formed therein. The vertical pipe body 2a includes the outlet 2c for sewage at the bottom end. The outlet 2c is disposed so as to be positioned below the bottom end of the spiral guide passage 23, and a discharge pipe 32 is attached to the downstream side of the outlet 2c. The discharge pipe 32 is formed of a tubular body which is expandable in diameter by the hydraulic pressure of the sewage flowing out of the vertical pipe body 2a and which has flexibility. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a vertical pipe with a spiral guideway installed at a location where a high head joint is provided in a sewer system.

  In the sewer, the basin sewer main line is planned at a relatively deep position in the ground, and it is a high head junction at the connection point with the related public sewer. For this reason, when high head processing is performed in one manhole, the vertical pipe provided in the manhole becomes longer, so the impact of falling sewage reaching the lower end of the vertical pipe increases, damaging the bottom of the manhole. There is a risk that hydrogen sulfide is diffused by impact and corrodes the concrete of the sewer pipe, thereby promoting aging.

  Therefore, in recent years, in order to prevent the inside of the manhole from being damaged by the sewage flowing down naturally in the manhole, for example, as disclosed in Patent Documents 1 and 2, a vertical head for a high head joint called a drop shaft is disclosed. A method of placing the tube in the manhole has been implemented. This type of vertical pipe is provided with a spiral guide path in a straight pipe vertical pipe body arranged vertically so as to guide sewage in a spiral shape and prevent it from flowing down linearly. As a result, the sewage that has flowed into the vertical pipe can be turned into a swirl flow, and the sewage flow energy is attenuated and guided to the bottom of the vertical pipe. It is possible to suppress this.

  In addition, in the case of a straight pipe vertical pipe without a spiral guide path in a conventional vertical pipe, air is entrained while the sewage naturally flows down, and the amount of air entrained when drained from the lower end of the vertical pipe increases. There was also a problem of end. The vertical pipe is connected from an outlet provided at the lower end to a downstream pipe line such as a downstream trunk line or a sewer main pipe. Therefore, if the amount of air entrainment is large, the storage capacity of sewage in the downstream pipe line of the vertical pipe is lowered, and there is a disadvantage that the planned water volume cannot be secured. However, when the vertical pipe with the spiral guide path as described above is used, there is an advantage that the amount of air entrainment can be greatly reduced.

  The sewage flowing out from the outlet joins the sewage flowing at a low speed in the downstream pipe line. Depending on the connection between the manhole and the downstream pipeline, sewage may flow out of the downstream pipeline while maintaining a spiral flow, or may flow out as an unsteady flow that sways from side to side. is there. In addition, sewage from the vertical pipe body may join from the outlet to the invert at the bottom of the manhole and the shallow part in the downstream pipe. If the sewage flows into the downstream pipe in such a state, the sewage may be scattered around, and accordingly, odor may be generated and collected in the manhole.

  In addition, when the sewage flows out from the outlet at a relatively high flow rate with respect to the downstream pipe, when the sewage merges with the sewage flowing through the bottom of the manhole by the air slightly involved while flowing down the vertical pipe In addition, eddy currents (jumps) may occur, or air pools may be formed at specific locations in the manhole to increase the pressure and blow off the manhole cover. When eddy currents are generated in the sewage in the downstream side pipe flowing at a low speed, there is a problem that the sewage is retained in the pipe and cannot be drained smoothly. For this reason, it was considered to reduce the flow velocity by reducing the diameter of the outlet and increasing the flow resistance or by providing a baffle plate at the outlet (see Patent Document 3).

JP-A-8-41915 JP 2004-137759 A JP 2005-248424 A

  However, if the outflow amount from the outflow port is not constant and the outflow amount increases or decreases, the water veins are not fixed in the downstream side pipe, and an unstable flow state such as the diffusion of the water flow occurs. In other words, when the amount of sewage that falls in the vertical pipe exceeds a predetermined amount, sewage is stored up to the top of the main body of the vertical pipe, resulting in outflow from the outlet. As a result, the flow rate of sewage increases, and it has been difficult to control the flow rate by setting the throttle amount at the outlet.

  In addition, a stable swirling flow is formed by the action of the spiral guide path, and the sewage flow energy is attenuated. However, if swirling flow is also present at the lower end of the vertical pipe body, the sewage flowing out from the outlet is There is a possibility of impact flow, and there is a risk of scattering from the outlet to the surroundings. The sewage scattered around the outlet may contaminate the manhole, which may cause odor and increase the amount of air entrained in the sewage. In addition, hydrogen sulfide is released by the impact of the sewage flow, corroding the concrete of the sewer pipe, and may deteriorate.

  In addition, when the unsteady flow state swayed from side to side is joined to the sewage flowing through the downstream pipe line in the manhole from the outlet, the sewage stays in the downstream pipe and scatters around. There is a possibility that odor is generated by the air mixed when flowing down the vertical pipe and accumulates in the manhole.

  In addition, in manholes with vertical pipes, in addition to the installation space for the vertical pipes, a maintenance management space must be provided around the vertical pipes and incidental facilities, which tends to increase the size of the structure and reduce design flexibility. there were. If the size is increased, the construction of manholes will become large, and the site area required for construction will increase, making it difficult to secure the land. Therefore, it is also required to design the manhole as small as possible. .

  The present invention solves such a conventional problem, and the sewage flowing into the pipe main body as a swirling flow by the spiral guide path reduces the air entrainment amount in a stable flow condition regardless of the flow rate. It is possible to reduce the outflow speed from the outflow port or to flow out in a substantially steady flow state, eliminate various problems in the downstream pipe line, and prevent the manhole from being enlarged. The object is to provide a longitudinal tube with a spiral guideway.

  In order to achieve the above-described object, the present invention provides a vertical pipe body that spirally flows down sewage flowing from an upper sewage pipe through a spiral guideway, and an outlet that discharges sewage attenuated by the spiral guideway to the lower sewage pipe. The outlet is provided below the lower end of the spiral guide, and a flexible discharge pipe is provided on the downstream side of the outlet. And

  With such a configuration, the flow of sewage flowing out of the vertical pipe can be suppressed to a state close to a steady flow, and the sewage can be prevented from becoming an impact flow, and can be joined to the lower sewage pipe at a low speed. be able to. Moreover, since the discharge pipe has flexibility, it can be changed to a shape following the water flow in the lower sewer pipe, and the flow path resistance is not increased.

  In addition, the present invention provides a spiral guide path comprising a vertical pipe body for causing sewage flowing from an upper sewage pipe to spirally flow down by a spiral guide path, and an outlet for discharging sewage attenuated by the spiral guide path to a lower sewage pipe. The outlet is provided below the lower end of the spiral guide path, and a flexible discharge pipe is provided on the downstream side of the outlet, and the discharge pipe is vibrated by the pressure of sewage. It is characterized by being free to be used.

  With such a configuration, the flow of sewage flowing out of the vertical pipe can be suppressed to a state close to a steady flow, and the sewage can be prevented from becoming an impact flow, and can be joined to the lower sewage pipe at a low speed. be able to. Further, since the discharge pipe has flexibility and can be freely swung by the water flow in the lower sewage pipe, the flow path resistance is not increased.

  Therefore, by having these configurations, it is possible to prevent the sewage flowing out from the vertical pipe from contaminating the inside of the manhole where the vertical pipe is installed or the inside of the lower sewage pipe or generating odors. .

  Further, in the vertical tube with a spiral guide path having the above-described configuration, the discharge tube may have a configuration in which a wire reinforcing layer is internally provided. Thereby, it can respond to increase / decrease in the flow volume of sewage with a simple structure, and can improve the intensity | strength and durability of a discharge pipe.

  In order to achieve the above-described object, the present invention is directed to a vertical pipe body that spirally flows down sewage flowing from an upper sewage pipe through a spiral guide path, and drains sewage attenuated by the spiral guide path to the lower sewage pipe. A vertical guide pipe with a spiral guide path, wherein the outlet is provided below the lower end of the spiral guide path, and a flexible discharge pipe is provided on the downstream side of the outlet, The discharge pipe is characterized in that its diameter can be freely expanded by the pressure of sewage.

  With such a configuration, the flow of sewage flowing out of the vertical pipe can be suppressed to a state close to a steady flow, and the sewage can be prevented from becoming an impact flow, and can be joined to the lower sewage pipe at a low speed. be able to. Moreover, since the discharge pipe has flexibility, it can be changed to a shape following the water flow in the lower sewer pipe, and the flow path resistance is not increased. Furthermore, since the discharge pipe can be freely expanded by the pressure of the sewage, even if the amount of sewage inflow into the vertical pipe increases, the discharge pipe can be expanded to increase the discharge flow rate. Regardless of the flow rate of sewage, sewage can flow into the lower sewage pipe in a stable flow condition.

  In the vertical tube with a spiral guide path according to the present invention, the discharge tube preferably has a substantially cylindrical inner peripheral surface. Furthermore, the discharge pipe may have a shape gradually reduced in diameter toward the downstream side in a state where no fluid pressure is applied.

  With such a configuration, the discharge pipe discharges the sewage smoothly, and the discharge pipe becomes an orifice channel to bring about a throttling effect, allowing the sewage to flow out smoothly without splashing around, and accompanying the outflow of sewage It is possible to keep the air entrainment amount extremely low.

  Further, the present invention is the longitudinal tube with a spiral guide path having the above-described configuration, wherein the outflow port is provided with a lateral outflow tube, a discharge tube is attached to the outflow tube, and the length of the outflow tube is the length of the longitudinal tube body. It is preferable that the length is up to ½D with respect to the diameter D.

  With this configuration, the length of the outflow pipe can be shortened, so the installation space for the outflow pipe in the manhole can be reduced, and sufficient maintenance management space is secured around the vertical pipe and outflow pipe. Is possible. Therefore, without enlarging the manhole, the amount of air entrainment can be reduced regardless of the flow rate of the sewage, and the sewage flowing out from the outlet can be prevented from becoming an impact flow. It can be solved.

  Further, when the discharge pipe is disposed so that the downstream end thereof is directed downward, when the diameter of the lower sewage pipe is 2D and the planned water level is D, the height of the discharge outlet in the lower sewage pipe is high. The structure provided in the range of D-3 / 2D on the basis of the tube bottom may be sufficient.

  With such a configuration, the sewage can flow down without disturbing the flow state of the sewage flowing through the lower sewage pipe, and the sewage can be discharged in a stable state from the vertical pipe.

  According to the vertical pipe with a spiral guideway of the present invention configured as described above, the manhole is a simple structure that does not increase in size, and in the sewage flowing down as a swirling flow through the spiral guideway of the vertical pipe, Regardless of this, it is possible to reduce the amount of air entrained in a stable flow condition, and by reducing the outflow speed from the outlet, it is possible to smoothly join the downstream pipe.

It is explanatory drawing which showed the vertical pipe with a spiral guideway which concerns on one Embodiment of this invention with the longitudinal cross-section of the manhole. It is explanatory drawing which shows an example of the discharge pipe in Embodiment 1 typically. It is a vertical pipe with a spiral guideway concerning Embodiment 1, and is an explanatory view showing typically a mode at the time of usual flow. It is a vertical pipe with a spiral guide way concerning Embodiment 1, and is an explanatory view showing typically a mode at the time of a large flow rate. It is explanatory drawing which shows the other form of the said discharge pipe. It is explanatory drawing which showed typically the vertical pipe with a spiral guideway which concerns on Embodiment 2. FIG. 6 is a partial cross-sectional view illustrating an example of a discharge pipe mounting structure in Embodiment 2. FIG.

Hereinafter, the form for implementing the vertical pipe with a spiral guideway concerning the present invention is explained, referring to drawings.
(Embodiment 1)
FIG. 1 is an explanatory view showing a vertical tube with a spiral guide path according to Embodiment 1 of the present invention together with a vertical cross section of a manhole.

  A straight tubular vertical pipe 2 is installed inside the manhole 1 as a sewer pipe to be a high head joint. The vertical pipe 2 causes the sewage flowing in from the upper sewage pipe 4 connected to the upper part to flow down and discharges it toward the lower sewage pipe 5. In the illustrated manhole 1, the tube axis direction of the upper sewage pipe 4 and the tube axis direction of the longitudinal tube 2 are orthogonal to each other, and are eccentric with respect to the tube axis of the manhole 1 inside the manhole 1. 2 is disposed.

  The vertical pipe body 2a of the vertical pipe 2 includes a sewage inlet 2b on the upper side surface, and an upper sewage pipe 4 is connected thereto. A spiral guide plate 20, which is a spirally shaped plate-like body, is disposed in the vertical pipe body 2 a, and is configured as an upper spiral guide path 21 and a lower spiral guide path 23 from above, and the upper spiral guide path 21. An intermediate guide path 22 without the spiral guide plate 20 is provided between the lower guide path 23 and the lower guide path 23. The spiral pitch of the spiral guide paths 21 and 23 is appropriately selected according to the length of the vertical pipe body 2a, the planned flow rate of sewage to flow down, the required speed, and the like.

  At the center of the upper spiral guide path 21 of the vertical pipe 2, a central cylinder (air venting core cylinder) 24 having a hollow inside is provided. The central tube 24 is formed using, for example, a small-diameter cylindrical tube having a diameter of about 1/3 of the inner diameter of the vertical tube 2 and is disposed concentrically with the vertical tube 2. As shown in FIG. 1, the upper end of the center tube 24 extends to a position above the top of the upper sewage pipe 4 and is opened in the manhole 1. The central portion of the lower spiral guide path 23 does not have to be provided with a central cylinder, and a hollow portion having substantially the same size as the central cylinder 24 is formed. The centers of the spiral guide paths 21 and 23 serve to discharge air contained in the sewage while the sewage flows down in the vertical pipe 2, thereby reducing the amount of air entrainment.

  A guide plate 25 is provided on the upper side surface of the center tube 24. The guide plate 25 is disposed along the pipe axis direction of the vertical pipe 2 and has a length substantially the same as the height from the top of the upper sewage pipe 4 to the start end of the upper spiral guide path 21. It is formed to have.

  Thereby, the sewage that has flowed into the vertical pipe body 2a from the upper sewage pipe 4 collides with the guide plate 25, is guided to the upper spiral guide path 21, and is guided in the spiral rotation direction. Then, the sewage flows along the upper spiral guide path 21 and starts to form a swirl flow in one direction, and then flows down in the vertical pipe 2 through the intermediate guide path 22 and the lower spiral guide path 23. In the process, the sewage turns into a swirling flow, which reduces the fall energy and separates the sewage and air.

  The material used for the vertical tube 2 is not particularly limited, but from the viewpoint of strength and rigidity, for example, a synthetic resin material such as hard vinyl chloride resin, FRP, polycarbonate, etc. is preferable. In addition, a fiber reinforced plastic mortar (so-called FRPM) which is a laminate of FRP and mortar, a composite material of synthetic resin and cement, or the like is also suitable. The center tube 24 and the spiral guide paths 21 and 23 are preferably formed using FRP or vinyl chloride resin from the viewpoint of strength, workability, and the like, and further, FRP is laminated on the vinyl chloride resin. Reinforcement may be used.

  The sewage flowing down as a swirl flow through the upper spiral guide path 21, the intermediate guide path 22, and the lower spiral guide path 23 reaches the tube bottom of the vertical tube body 2a. The bottom portion of the vertical pipe body 2a is supported by a concrete slab 11 provided inside the manhole 1. Further, a sewage outlet 2c is provided at the bottom of the vertical pipe body 2a.

  The outlet 2 c is opened at a position lower than the lower end of the lower spiral guide path 23. The sewage flows out from the outlet 2c to a lower sewage pipe 5 such as a sewage main line provided penetrating the bottom of the manhole 1. Further, an invert 12 is provided at the bottom of the manhole 1, and is intended to receive sewage from the outlet 2c and smoothly drain it downstream with the sewage flowing through the lower sewage pipe 5. .

  An outflow pipe 31 is connected to the outflow port 2c in the lateral direction. A discharge pipe 32 is provided at the distal end of the outflow pipe 31. As the outflow pipe 31, a pipe having a smaller diameter than the inner diameter of the vertical pipe body 2a can be used.

  The discharge pipe 32 is a tubular body that can be expanded in diameter by the fluid pressure of sewage flowing out of the vertical pipe body 2a and has flexibility. The discharge port 321 at the distal end is disposed facing downward due to its flexibility.

  FIG. 2 is an explanatory view schematically showing an example of the discharge pipe 32 in the present embodiment. The discharge pipe 32 is a tubular body whose diameter is gradually reduced from the upper base end in the drawing toward the lower tip in the drawing when no fluid pressure is applied. Further, the discharge pipe 32 preferably has an inverted frustoconical outer shape as shown in the figure, so that the amount of air mixed into the discharged sewage can be reduced, and water conditioning becomes easy. .

  The discharge port 321 at the distal end is formed with a size of about 1 / 5d to 1 / 2d with respect to the diameter d on the proximal end side. The discharge pipe 32 is attached to the outflow pipe 31 with the discharge port 321 facing the bottom of the manhole 1 (downward in FIG. 1). Although the attachment means of the discharge pipe 32 is arbitrary, it is preferable that it can be removed and inspected and replaced by fixing using an appropriate attachment 33 such as a fastening band from the viewpoint of maintenance.

  The discharge pipe 32 has such a property that it can be expanded or swung by the fluid pressure of the sewage, and may be made of a flexible material, and the material is not particularly limited. For example, a rubber material such as an elastic rubber containing a synthetic rubber or an elastomer material can be used for the discharge pipe 32. More specifically, the material of the discharge pipe 32 is more preferably provided with wear resistance and chemical resistance. For example, a tubular body made of silicon rubber, EPDM rubber, urethane rubber or the like is used. be able to.

  With such a configuration, when the sewage flowing down spirally inside the vertical pipe 2 flows out from the outlet 2c, the sewage tends to scatter around by the remaining centrifugal force. Since it protrudes from the outer peripheral surface of 2a, the action which suppresses the flow is made.

  Further, the discharge pipe 32 connected to the outflow pipe 31 absorbs the energy that the sewage that flows out is scattered, and the pressure loss is increased and attenuated, and the discharge port 321 brings about a throttling effect of the orifice flow path to slow down the sewage. To discharge. As a result, the sewage flows out from the discharge pipe 32 without splashing to the surroundings, becomes a state close to a steady flow, and smoothly joins the sewage flowing through the invert 12 at the bottom of the manhole 1.

  In FIG. 1, if the distance between the tip end portion (discharge port 321) of the discharge pipe 32 and the water surface of the sewage flowing through the invert 12 is too far, there is a risk of disturbing the flow condition when the sewage is landed. Therefore, as shown in the drawing, the discharge pipe 32 is disposed such that the discharge port 321 is located at a height lower than the top of the lower sewage pipe 5. Preferably, when the diameter of the lower sewage pipe 5 is 2D and the planned water level is D, the height h of the discharge port 321 in the lower sewage pipe 5 is provided in the range of D to 3 / 2D with respect to the pipe bottom. It is. Thereby, the sewage can flow down without disturbing the flow of the sewage flowing through the lower sewage pipe 5, and the sewage can be discharged in a stable state from the vertical pipe 2.

  In addition, even if the water surface of the lower sewage pipe 5 becomes higher than the discharge port 321 because the sewage amount temporarily exceeds the planned water amount, the discharge pipe 32 follows the flow of sewage due to its flexibility. Since the shape can be changed, the flow of sewage is not hindered.

  3 and 4 are explanatory views schematically showing the vertical pipe 2 with a spiral guide path according to the first embodiment. FIG. 3 shows a normal flow rate and FIG. 4 shows a high flow rate. ing.

  By providing the discharge pipe 32 as described above, the flow rate of the sewage flowing out from the lower end of the vertical pipe 2 can be effectively reduced without using a large apparatus. Can be matched.

  For example, at a normal flow rate as shown in FIG. 3, the discharge port 321 is maintained in a narrowed form and an orifice channel is formed so that the flow of sewage is suppressed and the state is close to a steady flow. Sewage flows out at low speed.

  On the other hand, when the flow rate of sewage temporarily increases as shown in FIG. 4, such as when there is a large amount of rainfall, the discharge pipe 32 expands in a substantially cylindrical shape due to the increased fluid pressure of the sewage. In addition, the amount of flowing water can be increased. As a result, even when the sewage flow rate is increased than usual, the sewage is not stored up to the upper portion of the vertical pipe body 2a, but is smoothly drained, and the flow rate of sewage flowing out from the discharge pipe 32 is increased. Adverse effects can also be prevented. As a result, the sewage stably flows out from the discharge pipe 32 without splashing around, and smoothly joins the sewage flowing through the invert 12 at the bottom of the manhole 1.

  Moreover, as a form of the discharge pipe 32 corresponding to the time of a large flow rate shown in FIG. 4, as illustrated in FIG. 5, a slit (cut) 322 may be provided from the tip portion to the intermediate portion. The slit 322 is provided as a cut from the discharge port 321 side of the discharge pipe 32 toward the base end portion, and has a length of about half of the entire length. In addition, the slits 322 may be provided in the discharge pipe 32 evenly in the circumferential direction and may be provided with about 2 to 4 slits.

  Even when such a discharge pipe 32 is used, since a large fluid pressure does not act at the normal flow rate shown in FIG. 3, the orifice flow path is maintained with the slit 322 closed, and a throttling effect is exhibited. In addition, at the time of a large flow rate shown in FIG. 4, the slit 322 is opened by the fluid pressure of the sewage flowing through the discharge pipe 32, and the discharge port 321 is expanded to increase the amount of sewage.

Note that the discharge pipe 32 is not limited to a tubular body in which the discharge port 321 is formed smaller than the diameter d of the base end portion as described above. A cylindrical synthetic resin hose called a suction hose may be used as long as it is a tubular body having flexibility. Furthermore, in this case, in order to ensure the strength of the discharge pipe 32, a configuration in which a wire reinforcing layer is provided may be used. Any of these forms of the discharge pipe 32 absorbs the energy of the sewage that flows out, increases the pressure loss, attenuates it, and enables discharge at a low speed. Further, when the discharge pipe 32 is damaged or deteriorated due to long-term use, it can be appropriately replaced.
(Embodiment 2)
Next, a vertical pipe with a spiral guideway according to Embodiment 2 of the present invention will be described. FIG. 6 is an explanatory view schematically showing a sewage outflow portion structure of the second embodiment, and FIG. 7 is a partial cross-sectional view showing an example of a discharge pipe mounting structure.

  In addition, the vertical pipe with a spiral guide path according to this embodiment is characterized by the structure of the outlet 2a and the installation form of the discharge pipe 32. The peripheral structure of the vertical pipe 2 and the shape of the discharge pipe 32 itself are the same as those described above. The same thing as the form 1 is applicable. Therefore, parts different from the first embodiment will be mainly described, and the description of the other configurations will be omitted by using the same reference numerals as those of the first embodiment.

  In this embodiment, the bottom part of the vertical pipe body 2a is installed in the bottom part of the manhole 1, and the outflow port 2c is provided in the lower surface of the vertical pipe body 2a. As shown in FIG. 7, an outflow pipe 31 constituted by an FRPM pipe is connected to the outflow port 2c. At both ends of the outflow pipe 31, flanges 311 and 311 are provided, respectively. One end of the outflow pipe 31 is integrally joined to the outer surface of the vertical pipe body 2a from the outside by FRP lamination using the flange 311. A discharge pipe 32 is attached to the other end of the outflow pipe 31 so as to be engaged with the flange 311.

  The discharge pipe 32 may be any form of discharge pipe described in the first embodiment. In addition, by providing a locking projection 323 that protrudes inwardly at the base end of the discharge pipe 32, the discharge pipe 32 can be easily locked by being locked to the flange 311 of the outflow pipe 31. In the illustrated embodiment, the outflow pipe 31 and the discharge pipe 32 are coupled by fitting two fittings 33 such as fastening bands to the outer surface of the locking projection 323. The energy of the sewage flowing through the outflow pipe 31 and the discharge pipe 32 is suppressed, and the sewage smoothly flows out without scattering in the lower sewage pipe 5 and flows from the bottom of the manhole 1 to the lower sewage pipe 5. It will join the sewage. Even if the amount of sewage temporarily increases, the shape of the discharge pipe 32 can be changed in the direction to follow the flow of sewage due to its flexibility, so there is no possibility of obstructing the flow of sewage. .

  Here, the length L of the outflow pipe 31 can be appropriately determined according to the size of the manhole 1 and the planned flow rate of sewage, but it is sufficient if the length L is 1 / 2D with respect to the diameter D of the vertical pipe body 2a. It can be formed very short. That is, in the conventional structure, the downflow energy of the sewage flowing out from the outlet is reduced by lengthening the outflow pipe. However, in this embodiment, the discharge pipe 32 absorbs the downflow energy of the sewage and increases the pressure loss. Therefore, the outflow pipe 31 can be shortened.

  Thereby, the installation space of the outflow pipe 31 in the manhole 1 can be reduced, it is possible to secure a sufficient maintenance management space around the vertical pipe 2 and the outflow pipe 31, and the diameter of the manhole is increased. There is no need to do. Therefore, without enlarging the manhole 1, the amount of sewage air entrainment can be reduced, and the sewage can be discharged in a state where the outflow speed is stably reduced regardless of the flow rate.

  Moreover, in FIG. 7, the discharge pipe 32 drawn with the continuous line has shown the state at the time of being connected to the outflow pipe 31, and when water flows, the discharge outlet 321 will become the lower sewage pipe 5 as shown in FIG. Direct toward the bottom of the tube. Further, at the time of a large flow rate, the discharge pipe 32 can be expanded by the increased fluid pressure of the sewage, as shown by a two-dot chain line in FIG.

  Although not shown in the drawings, the vertical pipe 2 with a spiral guide path is not limited to the embodiment shown in FIG. 1, and has a shape such that the lower part of the vertical pipe body 2 a is directly connected to the lower sewer pipe 5 without bending. Alternatively, the vertical pipe 2 may be provided with the discharge pipe 32. In this embodiment, the discharge pipe 32 is attached downward to the lower part of the vertical pipe body 2a. The shape of the discharge pipe 32 and the situation where sewage flows through the discharge pipe 32 are the same as the configuration shown in the first embodiment.

  The vertical pipe 2 with the spiral guide path as described above reduces the air entrainment amount regardless of the flow rate of the sewage, and the sewage flowing out from the outlet 2c even if a swirling flow exists at the lower end of the vertical pipe 2. Can be avoided, and the water veins in the lower sewage pipe 5 can be stabilized to eliminate various conventional problems.

  INDUSTRIAL APPLICABILITY The present invention can be suitably used as a vertical pipe that is installed at a location that is a high head joint in a sewer.

DESCRIPTION OF SYMBOLS 1 Manhole 12 Invert 2 Vertical pipe 2a Vertical pipe main body 20 Spiral guide plate 21 Upper spiral guide way 22 Intermediate guide way 23 Lower spiral guide way 24 Center tube 25 Guide plate 31 Outflow pipe 32 Discharge pipe 321 Discharge port 322 Cut (slit)
4 Upper sewer pipe 5 Lower sewer pipe

Claims (9)

A longitudinal pipe with a spiral guide path comprising a longitudinal pipe body that spirally flows down sewage flowing from an upper sewage pipe by a spiral guide path, and an outlet that discharges sewage attenuated by the spiral guide path to the lower sewage pipe. ,
The longitudinal pipe with a spiral guide path, wherein the outlet is provided below the lower end of the spiral guide path, and a discharge pipe having flexibility is provided on the downstream side of the outlet. A longitudinal pipe with a spiral guide path comprising a longitudinal pipe body that spirally flows down sewage flowing from an upper sewage pipe by a spiral guide path, and an outlet that discharges sewage attenuated by the spiral guide path to the lower sewage pipe. ,
The outlet is provided below the lower end of the spiral guide path, a flexible discharge pipe is provided on the downstream side of the outlet, and the discharge pipe can be swung freely by the pressure of sewage. A vertical pipe with a spiral guideway. In the vertical pipe with a spiral guideway according to claim 1 or 2,
A vertical pipe with a spiral guide path, wherein the discharge pipe is internally provided with a wire reinforcing layer. A longitudinal pipe with a spiral guide path comprising a longitudinal pipe body that spirally flows down sewage flowing from an upper sewage pipe by a spiral guide path, and an outlet that discharges sewage attenuated by the spiral guide path to the lower sewage pipe. ,
The outlet is provided below the lower end of the spiral guide path, a flexible discharge pipe is provided on the downstream side of the outlet, and the discharge pipe can be expanded in diameter by the pressure of sewage. A vertical pipe with a spiral guideway. In the vertical pipe with a spiral guideway according to any one of claims 1 to 4,
The discharge pipe is a vertical pipe with a spiral guide path, characterized in that the inner peripheral surface has a substantially cylindrical shape. In the vertical pipe with a spiral guideway according to claim 5,
The discharge pipe is a vertical pipe with a spiral guide path, wherein the discharge pipe is a tubular body having a diameter gradually reduced toward the downstream side in a state where no fluid pressure is applied. In the longitudinal pipe with a spiral guide path according to any one of claims 1 to 6,
A vertical pipe with a spiral guide path, wherein the discharge pipe is provided with a plurality of cuts from a downstream end portion to an intermediate portion. In the vertical tube with a spiral guide path according to any one of claims 1 to 7,
A lateral outflow pipe is provided at the outflow outlet, a discharge pipe is attached to the outflow pipe, and the length of the outflow pipe is up to 1 / 2D with respect to the diameter D of the vertical pipe body. A vertical pipe with a spiral guideway. In the vertical tube with a spiral guide path according to any one of claims 1 to 7,
The discharge pipe is disposed with its downstream end facing downward, and when the diameter of the lower sewage pipe is 2D and the planned water level is D, the height of the discharge outlet in the lower sewage pipe is based on the bottom of the pipe. A vertical pipe with a spiral guide path, characterized in that it is provided in a range of D to 3 / 2D.

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