JP2008190250A - Inflow part structure of longitudinal pipe with spiral guide passage - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inflow part structure of a longitudinal pipe with a spiral guide passage, smoothly guiding a fluid flowing into the longitudinal pipe to the spiral guide passage even when a plurality of inflow pipes are connected to a manhole. <P>SOLUTION: The plurality of inflow pipes 11, 12 are connected to the upper pipe wall of the manhole 1 to have a difference in level, and inflow ports 22, 23 corresponding to the respective inflow pipes 11, 12 are provided on the upside of the longitudinal pipe body 21. A guide wall 32 connecting the inner surface of the manhole 1 and the outer surface of the longitudinal pipe body 21 to guide a fluid so that the fluid flowing down from the ends of the respective inflow pipes 11, 12 smoothly flows into the longitudinal pipe body 21 is erected on an upper slab 13 to form an inflow part 3. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an inflow portion structure of a vertical pipe with a spiral guide path that is used for a vertical sewer pipe having a height difference and attenuates a naturally flowing water flow.

  Conventionally, as described in Patent Document 1, for example, the upper end of a vertical pipe is connected to one end of an inflow pipe protruding from the side wall of the manhole into the manhole, and the lower end of the vertical pipe is installed at the bottom of the manhole. A technique for introducing sewage that has flowed into a manhole through an inflow pipe into a vertical pipe is known. 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 a high head process is performed in one manhole, the vertical pipe provided in the manhole becomes long, so the drop impact of sewage flowing out from the lower end of the vertical pipe is large, and the bottom of the manhole may be damaged. was there.

  Therefore, for example, as described in Patent Document 2, there is a method of arranging a vertical pipe (drop shaft) formed with a spiral guide plate formed in a spiral shape from the upper end to the lower end along the inner surface of the vertical pipe main body. It has been adopted.

  This type of vertical pipe is provided with a spiral guide path that causes sewage to spirally flow down with respect to a vertically arranged vertical pipe main body. This attenuates the flow energy of the sewage that has flowed into the manhole, so that the bottom of the vertical pipe is not subject to strong impact or load by the sewage that has flowed down, and the wear of the bottom can be suppressed by ensuring the strength. Is formed. In addition, a hollow center tube (air vent core tube) is provided at the shaft core portion of the spiral guide path to exclude upward the air contained in the sewage guided by the spiral guide path.

  In such a pipe with a spiral guide path, sewage flowing into the upper end of the pipe is attenuated while flowing down along the spiral guide path. Therefore, the bottom of the manhole is prevented from being damaged or worn by the load or impact of the flowing water.

  For example, as shown in FIG. 3, a vertical pipe 101 used for connecting a sewer having a height difference from an upstream horizontal pipe 102 to a sewage horizontal pipe 103 is provided in a manhole 10 along the vertical direction. It has been.

  The manhole 10 has a space 104 into which a worker who performs inspection can enter for maintenance, and an intermediate slab 105 for operation is also provided in the intermediate portion in the vertical direction.

The vertical pipe 101 has an inflow pipe 102a extending from the upstream horizontal pipe 102 through a connecting portion 106, and sequentially downwards an upper spiral guide path 107, an intermediate guide path 108, and a lower spiral guide path 109. It is configured to be connected to a vertical pipe body 110 having Among them, the upper spiral guide path 107 is provided with a spiral guide plate 107b around the hollow central tube 107a, and the lower spiral guide path 109 is also provided with a spiral guide plate 109a.
Japanese Utility Model Publication No. 4-53842 JP-A-8-41915

  However, the number of inflow pipes connected to the manhole is not limited to one, and there may be a structure in which a plurality of horizontal pipes are gathered in the manhole. In that case, for each horizontal pipe and inflow pipe, It was necessary to install vertical pipes and reduce the sewage flow from each pipe.

  As a result, a plurality of vertical tubes are arranged in the internal space of one manhole, and the space required for the arrangement of the vertical tubes is increased, resulting in a disadvantage that the manhole is increased in size.

  In order to solve this problem, for example, it is conceivable to provide one longitudinal pipe having a relatively large diameter in the internal space of the manhole and connect a plurality of inflow pipes thereto. However, since the inflow pipes have different embedment depths or connection directions (inflow directions), it is difficult to smoothly guide the sewage flowing from the inflow pipe to the spiral guide path to form a swirling flow. Become. Further, when sewage is caused to flow from a plurality of inflow pipes, the sewage may drop and collide with the spiral guide plate and damage the spiral guide plate.

  Therefore, the present invention has been made in view of the above problems, and even when there are a plurality of inflow pipes connected to a manhole, the fluid flowing into the vertical pipe is smoothly guided to the spiral guide path. The present invention provides an inflow portion structure of a vertical pipe with a spiral guide path.

  In order to achieve the above-described object, the inflow portion structure of the vertical pipe with a spiral guide path according to the present invention has a straight vertical pipe main body installed in a manhole, and the fluid flowing into the vertical pipe main body is formed in a spiral shape. A spiral guideway is provided to flow down. A plurality of inflow pipes are connected to the upper pipe wall of the manhole so as to have a height difference, and inlets corresponding to the respective inflow pipes are provided in the upper part of the vertical pipe body, and lower positions than these inlets. An upper slab is disposed between the inner surface of the manhole and the outer peripheral surface of the vertical tube main body, and a central tube is provided at the center of the spiral guide path in the vertical tube main body. An inner surface of the manhole and an outer surface of the vertical pipe body are provided so that fluid that extends upward from the top of the inflow pipe and flows down from the end of each inflow pipe connected to the manhole smoothly flows into the vertical pipe body. A guide wall for connecting the fluid and guiding the fluid is erected on the upper slab to form an inflow portion. In the guide wall, a pair of wall bodies are erected on the upper slab with respect to one inflow pipe, and one wall body is disposed in the inflow pipe entrance direction from the outer edge of the inflow pipe. It is formed so as to circumscribe the vertical pipe body, and the other wall body is disposed in the central tube direction of the vertical pipe body from the outer edge portion of the inflow pipe and is connected to the inlet of the vertical pipe body. It is said.

  With such an invention, the fluid flowing in from the inflow pipe is guided to the guide wall and smoothly flows into the vertical pipe through the inflow portion. And even if there are a plurality of inflow pipes, it is possible to appropriately lead to the inflow port of the vertical pipe body by the inflow part, so that it is possible to perform the drop process without causing disturbance. In addition, with such a guide wall configuration, the fluid can be smoothly guided to the inflow port of the vertical pipe body, and the upper slab is partitioned by the guide wall so that the fluid entry area is limited. It becomes possible to use a portion other than as a maintenance space.

  In addition, a guide plate for guiding the fluid flowing from the inflow pipe into the vertical pipe body in the rotation direction of the spiral guide path is provided in the radial direction of the vertical pipe body at the start end of the spiral guide path in the vertical pipe body. And is formed integrally with the outer peripheral surface of the central tube and the inner peripheral surface of the vertical tube body, and the inflow tube is connected to the vertical tube body from a direction orthogonal to the guide plate, and the guide wall It is preferable that the one wall body is disposed so as to be orthogonal to the guide plate. Furthermore, it is preferable that the other wall body of the guide wall is disposed on a straight line connecting the outer edge portion of the inflow pipe and the edge portion of the guide plate in the vertical pipe body.

  By being configured in this way, the fluid flowing in from each inflow pipe naturally flows into the inlet of the vertical pipe main body, flows down against the guide plate in the vertical pipe main body, and smoothly flows into the spiral guide path without causing turbulence. It can be guided to facilitate the formation of a swirl flow.

  In the present invention, the inflow pipe is connected to the manhole from a direction facing the vertical pipe body, and the inflow portion formed by the inflow pipe and the guide wall is disposed in a substantially K shape in a top view. It may be.

  In this case, inflow water from the inflow pipe flows into the vertical pipe body from the opposite direction. By adopting such an inflow section structure, inflow water control is performed without causing disturbance of the inflow section. Is possible.

  Further, an invert may be provided at the bottom of the inflow portion, so that a smooth flow can be formed while preventing damage to the bottom.

  According to the inflow portion structure of the vertical pipe with a spiral guide path of the present invention configured as described above, even when there are a plurality of inflow pipes connected to the manhole, a limited space without increasing the size of the manhole It is possible to realize a structure that smoothly guides the fluid flowing into the vertical pipe to the spiral guide path, prevents the vertical pipe from being damaged, and secures a maintenance space.

  Hereinafter, the best mode for carrying out the inflow portion structure of a vertical pipe with a spiral guideway according to the present invention will be described with reference to the drawings.

  1 and 2 show an example of an inflow portion structure of a vertical pipe with a spiral guide path according to the present invention, FIG. 1 is an explanatory view showing a vertical pipe installed in a manhole by a cross section, and FIG. 2 shows the inside of the manhole. It is explanatory drawing shown by a longitudinal cross section.

  In each drawing, in order to make the drawing easy to see, the constituent members such as the central tube 24 and the guide plate 25 in the vertical tube main body 21 are omitted from the hatching indicating the cross section.

  As shown in the drawing, in the manhole 1, one straight pipe 2 is installed as a sewer pipe. The vertical pipe 2 is configured by sequentially connecting a vertical pipe main body 21 having an upper spiral guide path 22, an intermediate guide path (not shown), a lower spiral guide path, and the like downward.

  In FIG. 1, the structure of the upper part of the vertical tube main body 21 is shown. Among these, reference numeral 22 indicates an upper spiral guide path provided in the vertical tube main body 21. The pitch of the spiral of the spiral guide path 22 is appropriately selected according to the length of the vertical tube body 21 and the required speed of the fluid to flow down.

  A plurality of inflow pipes 11 and 12 are connected to the upper pipe wall of the manhole 1 so as to have a height difference. In the illustrated embodiment, the first inflow pipe 11 is connected to the manhole 1 at a position higher than the second inflow pipe 12, and is arranged so as to allow fluid to flow in from directions facing each other across the vertical pipe body 21. ing.

  In the upper part of the vertical pipe body 21, inlets 23 and 23 corresponding to the inflow pipes 11 and 12 are provided. Further, an upper slab 13 is disposed between the inner surface of the manhole 1 and the outer peripheral surface of the vertical pipe body 21 at a position below the inlets 23 and 23.

  The upper slab 13 forms a maintenance space in the manhole 1 in the manhole 1 and is provided with an access hole 131 for an operator to go down to the lower portion of the vertical tube body 21 for maintenance.

  At the center of the upper spiral guide path 22 in the vertical tube main body 21, a central cylinder (air venting core cylinder) 24 having a hollow interior is provided. The central tube 24 is, for example, a cylindrical tube having a diameter of about 1/3 that of the vertical tube main body 21 and is disposed so as to be concentric with the vertical tube main body 21. The upper end of the center tube 24 extends to a position above the top of the first inflow pipe 11 connected to the top of the inflow pipes 11 and 12.

  A guide plate 25 is provided on the upper side surface of the central cylinder 24. The guide plate 25 is erected upward from the start end of the spiral guide path 22 in the vertical pipe body 21, and fluid that has flowed into the vertical pipe body 21 from the inflow pipes 11, 12 is supplied to the spiral guide path 22. Is arranged to guide in the direction of rotation. That is, the inflowing sewage collides with the guide plate 25 to attenuate the flowing-down energy and to allow the sewage to flow smoothly in a single direction along the circumferential direction of the vertical pipe body 21. Is provided.

  As shown in FIG. 1, the illustrated guide plate 25 is disposed in the radial direction of the vertical tube main body 21 to define the inside of the vertical tube main body 21, and the outer peripheral surface of the center tube 24 and the inner peripheral surface of the vertical tube main body 21. Are integrally formed. The inflow pipes 11 and 12 are connected to the vertical pipe body 21 from a direction orthogonal to the guide plate 25.

  In the present invention, the upper slab 13 in the manhole 1 is provided with a concrete guide wall 31 that guides fluid by connecting the inner surface of the manhole 1 and the outer surface of the vertical pipe body 21. The guide wall 31 is configured by arranging a pair of wall bodies 311 and 312 for one inflow pipe 11 and 12, respectively.

  One wall body 311 of the guide wall 31 is disposed in the entrance direction of the inflow pipes 11 and 12 from the outer edge portions of the inflow pipes 11 and 12, and is arranged and formed so as to circumscribe the vertical pipe body 21. Yes. That is, as shown in FIG. 1, one wall body 311 of the guide wall 31 is disposed in a direction orthogonal to the guide plate 25 in the vertical tube main body 21.

  The other wall body 312 of the guide wall 31 is disposed from the outer edge of the inflow pipes 11 and 12 toward the central tube 24 of the vertical pipe body 21 and is connected to the inlet 23 of the vertical pipe body 21. Yes. More specifically, as shown in FIG. 1, the other wall body 312 of the guide wall 31 includes an intersection between the side surface of the central tube 24 and the edge of the guide plate 25, and outer edges of the inflow pipes 11 and 12. It is preferable that it is arrange | positioned on the straight line which connects.

  Further, in the illustrated embodiment, a tapered portion 311 a is attached in the vicinity of the connection portion between one wall body 311 and the vertical tube main body 21, and the fluid further flows into the inlet 23 of the vertical tube main body 21. It is configured to be easy to do.

  The installation height of the guide wall 31 may be determined by the height position of the top of the inflow pipe 11 and is preferably selected by adding an appropriate margin height in consideration of the case where there is excess inflow water. .

  By such guide walls 31, fluid inflow portions 3 from the inflow tubes 11 and 12 to the vertical tube main body 21 are formed, respectively, and the fluid flowing down from the end portions of the inflow tubes 11 and 12 connected to the manhole 1. It is configured to smoothly flow into the vertical pipe body 21.

  Further, as shown in FIG. 1, in this case, the two inflow pipes 11 and 12 are connected to the manhole 1 from opposite directions with the vertical pipe body 21 in between, so that the inflow portion 3 is connected to the inflow pipe. 11 and 12 and the guide wall 31 are formed so as to be substantially K-shaped when viewed from above.

  Furthermore, a groove-shaped invert 32 may be provided at the bottom of the inflow portion 3 formed by the guide wall 31. By providing the invert 32, it is possible to provide a gradient in each section from the inflow pipes 11 and 12 to the inflow port 23 of the vertical pipe body 21 or to easily introduce the flow into the inflow port 23. . Further, by providing the invert 32, it is possible to protect the upper surface of the upper slab 13, and it is possible to prevent the upper slab 13 from being damaged by the impact of the sewage flowing in.

  By configuring the inflow portion 3 in this way, the sewage flowing into the manhole 1 from the first inflow pipe 11 and the second inflow pipe 12 is guided to the guide wall 31 and the invert 32 in the inflow portion 3. It flows into the vertical tube main body 21 and reaches the upper spiral guide path 22 while flowing down along the guide plate 25. The sewage flowing from the first inflow pipe 11 starts to flow from the vicinity of the start end portion of the upper spiral guide path 22, and the sewage flowing from the second inflow pipe 12 flows into the upper spiral guide path 22 with a sufficient inflow drop. Then, the sewage flowing from the first inflow pipe 11 is merged.

  As a result, even when the plurality of inflow pipes 11 and 12 are connected to the manhole 1 from different directions and lead sewage to the vertical pipe 2, the inflow water control is facilitated in the inflow section 3, and the inflow water is disturbed. Therefore, it is possible to perform the necessary inflow and drop processing without causing occurrence and smoothly lead to the upper spiral guide path 22. Further, since the upper slab 13 is partitioned by the guide wall 31, a maintenance space can be secured.

  In addition, this invention is not limited to the said embodiment, If it is a case where several inflow pipes are connected to a manhole, it will be restricted to the case where two inflow pipes are arrange | positioned in the position which mutually opposes. In any case, it can be applied, and a smooth inflow / fall process can be performed without increasing the size of the manhole.

  INDUSTRIAL APPLICABILITY The present invention can be suitably used for a vertical pipe of a spiral guide path type drop shaft installed in a manhole having a high head joint that can flow down the entire amount of sewage in a sewer.

It is explanatory drawing which shows an example of the inflow part structure of the vertical pipe with a spiral guide path of this invention by a cross section. It is explanatory drawing which shows the inside of the said manhole by a longitudinal cross-section. It is a typical partial cross section perspective view explaining a mode that the conventional general vertical pipe is provided in the underground structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Manhole 11 1st inflow pipe 12 2nd inflow pipe 13 Upper slab 131 Entrance / exit hole 2 Vertical pipe 21 Vertical pipe main body 22 Upper spiral guide way 23 Inlet 24 Center tube 25 Guide plate 3 Inflow part 31 Guide walls 311 and 312 Wall 32 Invert

Claims (5)

An inflow portion structure of a vertical pipe with a spiral guide path provided with a spiral guide path in which a straight pipe vertical pipe body is installed in a manhole and a fluid that has flowed into the vertical pipe body is spirally flowed down,
A plurality of inflow pipes are connected to the upper wall of the manhole so as to have a height difference, and an inlet corresponding to each inflow pipe is provided at the upper part of the vertical pipe body, and at a position lower than these inlets. An upper slab is disposed between the inner surface of the manhole and the outer peripheral surface of the vertical tube body, and a central tube is provided at the center of the spiral guide path in the vertical tube body, and the upper end of the central tube is the uppermost inflow. Extending above the top of the tube,
A guide wall for guiding the fluid by connecting the inner surface of the manhole and the outer surface of the vertical pipe body so that the fluid flowing down from the end of each inflow pipe connected to the manhole smoothly flows into the vertical pipe body is the upper slab. And an inflow part is formed.
Each of the guide walls has a pair of walls standing on the upper slab with respect to one inflow pipe, and one wall is arranged in the inflow pipe entrance direction from the outer edge of the inflow pipe and circumscribes the vertical pipe body. And the other wall is disposed in the central tube direction of the vertical pipe body from the outer edge of the inflow pipe and connected to the inlet of the vertical pipe body. Inlet structure of the vertical pipe with attached. A guide plate for guiding the fluid flowing from the inflow pipe into the vertical pipe body in the rotation direction of the spiral guide path is disposed in the radial direction of the vertical pipe body at the start end of the spiral guide path in the vertical pipe body. And is integrally formed on the outer peripheral surface of the central tube and the inner peripheral surface of the vertical tube body,
2. The inflow pipe is connected to a vertical pipe body from a direction orthogonal to the guide plate, and one wall body of the guide wall is arranged to be orthogonal to the guide plate. The inflow part structure of the vertical pipe with a spiral guideway as described.   The other wall body of the said guide wall is arrange | positioned on the straight line which connects the outer edge part of an inflow tube, and the guide-plate edge part in a vertical pipe main body, The Claim 1 or 2 characterized by the above-mentioned. Inlet structure of a vertical pipe with a spiral guideway.   The inflow pipe is connected to the manhole from the opposite direction across the vertical pipe body, and the inflow portion formed by the inflow pipe and the guide wall is disposed in a substantially K shape in a top view. The inflow part structure of the vertical pipe with a spiral guideway in any one of Claims 1-3 to do.   The inflow portion structure of the vertical pipe with a spiral guide path according to any one of claims 1 to 4, wherein an invert is provided at a bottom portion of the inflow portion.

Images