JP2008101380A - Sewage flowing-in part structure of drop shaft - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sewage flowing-in part structure of a drop shaft which prevents a spiral guide passage from being broken by collecting a foreign matter likely to be mixed with rainwater and to flow into the drop shaft in advance to promote smooth flowing-down of sewage stream. <P>SOLUTION: This sewage flowing-in part structure of the drop shaft is constituted by providing a basin part 31 for removing foreign matter in a flowing-in pipe 3 provided on a side face of a vertical pipe main body 2 like a straight pipe so that the foreign matter mixed into the water flowing into the vertical pipe main body 2 remains or is sedimented in the basin part 31 for removing the foreign matter. An inspection hole is provided in an upper part of the basin part 31 for removing the foreign matter, and a basket for removing the foreign matter is provided in its inside. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a sewage inflow portion structure of a drop shaft with a spiral guideway.

  Conventionally, when there is a high drop in the manhole for sewage and the bottom of the manhole that flows into the manhole, a vertical sewer pipe with a spiral guideway (drop shaft) is used to reduce the falling sewage. An example in which is used is increasing (see, for example, Patent Documents 1 and 2).

  The spiral guide path is formed by spirally attaching a plate-like body to the inner peripheral surface of the vertical sewer pipe. In vertical sewage pipes where the head is large or the flow rate is large, the spiral guide path may be provided in two stages or upper, middle, and lower three stages separately above and below the vertical sewage pipe. In this case, the spiral guide path is formed by appropriately dividing the upper spiral guide path part, the intermediate guide path part, and the lower spiral guide path part.

  In addition, a central tube for air venting is provided at the center of the drop shaft provided with the spiral guide path, and is configured to prevent the entrainment of gas in addition to the absorption of the fall energy. Widely used without reducing the amount. The center tube is a hollow tube whose upper and lower ends are open, and is fixed in contact with the inner peripheral end of the spiral guide path.

  The center tube has a large amount of sewage flowing down the sewage pipe with a spiral guideway, and the spiral guideway is filled with the spiral guideway. In order to prevent the flow of air from being blocked by bubbles generated by colliding with the bottom surface of the spiral plate or manhole that constitutes the path, the amount of sewage flow is reduced, and is provided for the purpose of venting air. In addition to stabilizing the spiral shape of the spiral guide path, it also has the purpose of maintaining the strength of the spiral guide path.

  In the case where the spiral guide path is provided in two upper and lower stages or upper, middle, and lower three stages, in most cases, a central cylinder is provided in the upper spiral guide path part. Further, in the case of a vertical sewage pipe with a large-diameter spiral guide path, the lower spiral guide path part may not be provided with a central cylinder.

An inflow portion of sewage is connected from the side of the drop shaft in the vicinity of the upper end of the upper spiral guideway portion or the intermediate guideway portion.
JP-A-8-41915 JP 2005-315055 A

  By the way, when the amount of sewage increases due to a large amount of rainwater, etc., foreign objects such as relatively large pieces of wood, boards, or stones may be mixed into the sewage flow, and such foreign objects flow into the drop shaft. As a result, the spiral guide path may be damaged. In addition, if a large plate material is mixed in the inflowing water, the flow path will be blocked when it flows down in a spiral shape, and in particular, it will fit into the central part (without the center tube) of the lower spiral guide path part due to the force of the water flow. There was also a risk of piercing and hindering smooth sewage flow.

  Therefore, the present invention has been made in view of the above problems, and collects foreign matters that may be mixed in rainwater and flow into the drop shaft, preventing damage to the spiral guide path, The present invention provides a sewage inflow portion structure of a drop shaft that can promote a smooth sewage flow.

  In order to achieve the above-described object, the present invention is a sewage inflow portion structure of a drop shaft in which a spiral guide path is provided in a straight tubular vertical pipe body, and the inflow pipe provided on the side surface of the vertical pipe body includes The foreign matter removing saddle portion is provided, and the foreign matter mixed in the water flowing into the vertical pipe body is configured to stay or settle in the foreign matter removing saddle portion.

  According to this configuration, even when the amount of inflow of sewage is increased due to a large amount of rainwater or the like, the foreign matter mixed in the sewage flow stays or settles in the foreign matter removing saddle and flows into the vertical pipe body. Can be prevented. As a result, it is possible to smoothly flow down the sewage in the vertical pipe body, and it is possible to reduce the expected energy and to prevent the spiral guide path from being damaged.

  Moreover, it is preferable that the inspection port is provided in the upper part of the said foreign material removal collar. This makes it possible to easily check the foreign matter removing saddle, and to remove the staying or sedimenting foreign matter from the inspection port by periodic inspection, thereby preventing inflow into the vertical pipe body. Become.

  Furthermore, it is preferable that a removal basket is provided inside the foreign matter removing saddle. Thereby, at the time of inspection from the inspection port, it is possible to easily remove foreign matters by pulling up the removal basket, and workability is improved.

  According to the sewage inflow portion structure of the drop shaft of the present invention configured as described above, the foreign matter that may be mixed into rainwater or the like and flow into the drop shaft is collected in advance, and the factor that obstructs the flow path It is possible to remove and prevent the spiral guide path from being damaged, and promote the smooth flow of the sewage flow.

  Hereinafter, the best mode for carrying out a sewage inflow portion structure of a drop shaft according to the present invention will be described with reference to the drawings.

  FIG. 1 is an explanatory view schematically showing an example of a drop shaft in a longitudinal section. 2 to 4 show the sewage inflow portion structure of the drop shaft of the present invention, FIG. 2 is a side view of the sewage inflow portion structure, and FIG. 3 is a longitudinal sectional view showing the sewage inflow portion (inflow pipe). These are the longitudinal cross-sectional views which show the other form of a sewage inflow part (inflow pipe).

  The drop shaft 1 having a configuration as illustrated is a pipe installed in a manhole for drop processing, and includes a vertical pipe main body 2 and a spiral guide path 21 and a central cylinder 22 disposed therein. . The spiral guide path 21 is formed in two stages, an upper spiral guide path 211 and a lower spiral guide path 212. Between the upper spiral guide path 211 and the lower spiral guide path 212, an intermediate guide portion 213 having no spiral guide plate is provided.

  For example, a glass fiber reinforced resin composite tube is used for the vertical tube body 2, and the spiral guide path 21 is formed of glass fiber reinforced resin or the like. Further, a pipe made of glass fiber reinforced resin is used for the center tube 22.

  The vertical pipe body 2 is provided with an inflow pipe 3 at the sewage inflow portion at the upper end and an outflow pipe 4 at the sewage outflow portion at the lower end. The distance between the bottom of the inflow pipe 3 and the bottom of the outflow pipe 4 is the head distance H in the drop shaft. A bottom plate 214 made of a wear-resistant material (for example, high molecular weight polyethylene resin) is provided at the bottom of the vertical tube body 2. The center tube 22 is for exhausting upward the air contained in the sewage guided by the spiral guide path 21, and is disposed along the center of the vertical pipe body 2.

  The spiral guide path 21 is configured by a spiral guide plate 21 a that extends spirally in the vertical direction between the inner peripheral surface of the vertical tube body 2 and the outer peripheral surface of the center tube 22. A guide plate 23 for guiding sewage flowing from the inflow pipe 3 into the vertical pipe body 2 in the direction of rotation of the spiral guide plate 21a is provided at the inlet portion of the spiral guide path 21 (starting end portion of the spiral guide plate). Alternatively, it extends from the start end of the spiral guide plate 21a to the top of the vertical tube body 2. In addition, it is preferable that the spiral guide plate 21a is integrally formed by the hand lay-up method on the inner peripheral surface of the vertical tube body 2 and the outer peripheral surface of the center tube 22.

  In the drop shaft 1, when sewage that has entered a manhole (not shown) flows into the vertical pipe body 2 through the inflow pipe 3, the inflow water collides with the inner peripheral surface of the vertical pipe body 2 and the guide plate 23. The fluid flows in only one direction along the circumferential direction of the vertical tube body 2 and flows into the spiral guide path 21. The sewage that has flowed into the spiral guide path 21 becomes a vortex flow at the spiral guide plate 21 a and flows down in the vertical pipe body 2, and the energy is attenuated. (Not shown).

  Here, when wood pieces, plate materials, stones or the like are mixed in the sewage flowing into the inflow pipe 3, the spiral guide path 21 in the vertical pipe body 2 is blocked, or the spiral guide plate 21a is broken, resulting in vortex flow. It may be a factor to inhibit the formation of. Therefore, in the present invention, a mechanism for removing such foreign matter is provided in the sewage inflow portion of the drop shaft 1.

  In the illustrated embodiment, the foreign matter removing collar 31 is provided on the inflow pipe 3 provided on the side surface of the vertical pipe body 2. The foreign matter removing collar 31 is provided near the vertical pipe body 2 in the inflow pipe 3. As shown in the longitudinal section in FIG. 3, the foreign matter removing collar 31 is formed with a width substantially corresponding to the diameter of the inflow pipe 3, has a depth greater than the radius of the inflow pipe 3, and the inflow pipe 3. It is a buttock that protrudes from the bottom.

  Further, the inflow pipe 3 is provided with an inspection port 32 so as to face the upper part of the foreign matter removing collar 31. It is possible to grasp the situation of the inflow pipe 3 and the foreign matter removing collar 31 from the inspection port 32.

  Furthermore, a removal basket 33 may be provided inside the foreign matter removing collar 31. The removal basket 33 is formed so as to correspond to the internal dimensions of the foreign substance removal collar 31, and the upper edge of the basket is formed in a round shape in accordance with the shape of the bottom of the inflow pipe 3. The removal basket 33 may be provided with a handle for lifting, and when the removal basket 33 is provided in the foreign object removal collar 31, the size of the inspection port 32 is as shown in FIG. It is formed corresponding to the size through which 33 can be inserted, that is, the size of the foreign matter removing collar 31.

  With such a configuration, when foreign matter is mixed in the sewage flowing into the vertical pipe body of the drop shaft 1, the flow velocity is increased by the diameter of the foreign matter removing collar 31 so that the flow velocity and flow force change. It becomes possible to retain or precipitate foreign matter in the flange 31.

  The foreign matter captured by the foreign matter removing collar 31 is appropriately removed from the inspection port 32. When the removal basket 33 is provided, the foreign object can be easily removed by lifting the removal basket 33 from the inspection port 32.

  Further, as shown in FIG. 4, the foreign matter removing collar 31 may have a configuration in which a cylindrical short pipe is interposed in the inflow pipe 3 to form a collar. In this case, the foreign matter removing collar 31 is a tubular body having substantially the same diameter as the inflow pipe 3 and is provided eccentric to the inflow pipe 3. In addition, a short pipe having a diameter concentrically expanded with the inflow pipe 3 may be provided as the foreign matter removing collar 31.

  In any configuration, the foreign matter removing saddle portion 31 constitutes a saddle portion provided in the lower part of the flow path of the sewage flowing into the inflow pipe 3, so that the foreign matter mixed therein is the foreign matter removing saddle portion 31. Therefore, it becomes possible to prevent the inflow to the vertical pipe body 2.

  Therefore, in the vertical pipe body 2 of the drop shaft 1, the sewage flowing in from the inflow pipe 3 flows smoothly along the spiral guide path 21, becomes a spiral and forms a vortex, and the flow path is not hindered. The energy is attenuated and can be discharged from the lower outflow pipe 4.

  The present invention provides a drop shaft that is used to reduce falling sewage when there is a high difference between the bottom of the manhole and the sewage inflow pipe that flows into the manhole in, for example, sewage from the merging sewer. It can utilize suitably for an inflow part.

It is explanatory drawing which shows an example of a drop shaft typically by a longitudinal cross section. It is a side view of the sewage inflow part structure of the drop shaft which concerns on this invention. It is a longitudinal cross-sectional view which shows a sewage inflow part (inflow pipe). It is a longitudinal cross-sectional view which shows the other form of a sewage inflow part (inflow pipe).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drop shaft 2 Vertical pipe | tube main body 21 Spiral guide way 211 Upper spiral guide way 212 Lower spiral guide way 22 Center pipe 23 Guide plate 3 Inflow pipe 31 Foreign material removal collar part 32 Inspection port 33 Removal basket 4 Outflow pipe

Claims (3)

  It is a sewage inflow portion structure of a drop shaft in which a spiral guide path is provided in a straight tubular vertical pipe body, and an inflow pipe provided on a side surface of the vertical pipe body is provided with a foreign matter removing saddle portion, 1. A sewage inflow portion structure of a drop shaft, wherein foreign matter mixed in inflow water into a vertical pipe body is configured to stay or settle in a foreign matter removing saddle.   The sewage inflow portion structure of a drop shaft according to claim 1, wherein an inspection port is provided at an upper portion of the foreign matter removing saddle portion.   The sewage inflow portion structure of the drop shaft according to claim 2, wherein a removal basket is provided inside the foreign matter removing saddle portion.

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