JP2016089346A - Water passing structure of manhole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a water passing structure of a manhole in which the loss caused when rain water concentrates on a sewer pipe and flows in a manhole is reduced, an accident due to an increase in water-level in the manhole can be prevented and the inspection work of sewerage can easily be performed.SOLUTION: A water passing structure of a manhole is formed in substantially a semi-conical tubular shape in which an inner diameter of one end side 10 is made to an outer diameter of upstream side piping 3 or more, and an inner diameter of the other end side 11 is made to an inner diameter of downstream side piping 5 or more and the diameter of the outer diameter or less. When the one end side 10 is brought into abutment with an outflow port 4 of the upstream side piping 3, a running water induction cover 9 having a length for leaving a space necessary for inspection of the piping is covered on an invert 8 between the other end side 11 and an inflow port 6 of the downstream side piping 5, and the one end side 10 of the running water induction cover 9 is abutted and fixed to a side wall surface 2 of a manhole 1 where the outflow port 4 of the upstream side piping 3 is opened so as to cover the outflow port 4 of the upstream side piping 3.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a water passage structure for a human hole provided in a sewer.

In the sewer, human holes for workers to enter from the ground are installed at predetermined intervals in order to manage, maintain, and inspect the sewer. The manhole has an outlet of the upstream pipe of the sewer on the wall surface and an inlet of the downstream pipe facing the outlet, and an outlet of the upstream pipe and an inlet of the downstream pipe at the bottom. A groove-shaped invert is connected, and water that enters the human hole from the outlet of the upstream pipe flows into the inlet of the downstream pipe through the invert. It may overflow.
In particular, when a large amount of rain falls in a short period of time, rainwater concentrates on the sewer pipe and overflows from Invert when the water flows through the upstream and downstream pipes at a flow rate exceeding 50% of the pipe. It becomes. Since the water flowing through the sewer swells, the water overflowing from the invert greatly swells and collides with the wall of the human hole, and then suddenly contracts at the inlet side of the downstream pipe and flows into the downstream pipe. However, loss occurs due to abrupt contraction on the inlet side of the downstream piping. If this loss continues, water will start to accumulate in the manhole, causing accidents such as blowing up the lid of the manhole and flooding the ground.

In order to prevent such an accident, conventionally, joint pipes are provided at each of the upstream pipe outlet and the downstream pipe inlet provided on the wall of the manhole, and the joint pipes are mutually connected. There has been proposed a human-hole water-passing structure in which the pipes are connected by a connecting pipe having a cross-sectional area equivalent to that of the pipe constituting the upstream side pipe and the downstream side pipe (see, for example, Patent Document 1).
In Patent Document 1, the connecting pipe that connects the outlet of the upstream pipe line and the inlet of the downstream pipe line in the human hole is constituted by a divided pipe that can be divided in the circumferential direction, or an opening lid is provided on the connecting pipe. It is described that the inside of the connecting pipe can be inspected by removing the dividing pipe or opening the opening lid.

JP 2005-226406 A

However, according to the human-hole water-passage structure described in Patent Document 1, the joint pipes disposed at the outlet of the upstream pipe and the inlet of the downstream pipe are connected to each other between the upstream pipe and the downstream pipe. The connecting pipe having the same cross-sectional area as the pipe constituting the side pipe line is connected. However, since the connecting pipe is disposed in the invert provided at the bottom of the human hole, the groove diameter of the invert is the outer diameter of the connecting pipe. The diameter needs to be larger than the diameter.
The invert groove diameter of the existing human hole is generally equal to the inner diameter of the pipes constituting the upstream side pipe and the downstream side pipe. Therefore, the person described in Patent Document 1 in the existing human hole There is a problem that laborious work such as expanding the diameter of the invert is required when the hole water-permeable structure is implemented, and the connection pipe is connected to the outlet of the upstream pipe and the inlet of the downstream pipe. Since the joint pipes are arranged in each of them, and the joint pipes are connected to each other by the connection pipes, there is a problem that the connection of the connection pipes requires troublesome work.

  In addition, as management and maintenance of sewerage, inspection equipment is sent into the pipe from the outlet of the upstream pipe and the inlet of the downstream pipe, and the inside of the pipe is inspected. In the described human-hole water-passing structure, the dividing pipe constituting the connecting pipe is removed or the inside of the connecting pipe can be inspected by opening the opening lid. It is difficult to inspect the inside of the piping by sending inspection equipment from the inlet of the side pipe line, and even if the inspection equipment can be sent into the piping, a connecting pipe is configured for each inspection. There is a problem that a laborious work such as removing the dividing tube or opening the opening lid is required.

  The object of the present invention is to have a simple configuration, in which rainwater concentrates on the sewer pipe, and water flows into the upstream pipe and the downstream pipe at a flow rate exceeding 50% of the pipe. An object of the present invention is to provide a water passage structure for a human hole that can reduce loss of time, prevent an accident due to a rise in the water level in the human hole, and facilitate the inspection work of the sewer.

  In order to achieve the above object, the invention according to claim 1 is provided with an outlet of the upstream pipe and an inlet of the downstream pipe facing the outlet, on the wall of the human hole, In the water passage structure of a human hole in which a groove-shaped invert is provided at the bottom to connect the outlet of the upstream pipe and the inlet of the downstream pipe, the inner diameter on one end side is the outer diameter of the upstream pipe. It is formed in a substantially semi-conical cylindrical shape with the above-mentioned diameter, the inner diameter of the other end side being larger than the inner diameter of the downstream pipe and less than the outer diameter, and one end side is brought into contact with the outlet of the upstream pipe When the invert is covered with a running water guide cover having a length that allows a space necessary for inspection of the pipe between the other end side and the inlet of the downstream pipe, the one end side of the running water guide cover is placed on the upstream side. Cover the outlet of the upstream pipe on the side wall surface of the manhole where the outlet of the pipe opens. Cormorant to abut, characterized in that the fixing.

  According to the human-hole water-passage structure according to claim 1, the inner diameter on one end side is set to a diameter greater than or equal to the outer diameter of the upstream pipe, and the inner diameter on the other end side is greater than or equal to the inner diameter of the downstream pipe and less than the outer diameter. Is formed in a substantially semi-conical cylindrical shape with the diameter of the water, and the water flowing into the flowing water guide cover from the outlet of the upstream pipe flows into the flowing water guide cover, and the flow velocity decreases at one end side of the flowing water guide cover The pressure increases, and the water flowing to the other end side of the flowing water guide cover is squeezed toward the center in the process and becomes a high pressure, and the undulation is suppressed and flows out from the other end side of the flowing water guide cover with a stable pressure. Since the water flowing out from the other end side of the water flow guide cover is suppressed to a low diffusion and flows to the inlet of the downstream pipe at a high speed, the water is actively guided to the inlet of the downstream pipe. The effect of water flow to the inlet of the downstream pipe Is increased, it is possible to water flowing out into the person hole from the other end of the water flow-induced cover suppress the generation of eddy caused by colliding the wall surface of the person hole. Thereby, the loss due to the water overflowing from the invert can be reduced, and the rise of the water level in the human hole can be prevented.

  The invention according to claim 2 is characterized in that fins are formed in the flow direction of water on the inner surface of the flowing water guide cover according to claim 1.

  According to the water passage structure of a human hole according to claim 2, since fins are formed on the inner surface of the water flow guide cover in the direction of water flow, the water flowing to the other end side of the water flow guide cover is formed. The straight running performance is improved, and the water flowing out from the other end of the water flow guide cover is more actively guided to the inlet of the downstream pipe, and the water flow to the inlet of the downstream pipe The effect is enhanced, and the generation of vortices caused by the water flowing into the human hole from the other end of the flowing water guide cover colliding with the wall surface of the human hole can be further reduced.

  According to the water passage structure of the human hole according to the present invention, rainwater is concentrated and flows into the sewage pipe, and the water flows through the upstream pipe and the downstream pipe at a flow rate exceeding 50% of the pipe. When the loss at the time of inflow of manholes can be reduced, accidents caused by rising water levels in the manholes can be prevented, sewerage inspection work can be easily performed, and the present invention is applied to existing manholes In addition, since it is not necessary to modify the invert and the structure is simple, the work for carrying out the present invention is easy and can be carried out at a low cost.

It is a longitudinal cross-sectional view which shows an example of embodiment of the water passage structure of the human hole which concerns on this invention. It is a principal part top view of the water passage structure of a human hole shown in FIG. It is a perspective view which shows an example of the flowing water guide cover shown in FIG. It is sectional explanatory drawing which shows the other example of a flowing water guide cover. It is sectional explanatory drawing which shows the other example of a flowing water guide cover.

Hereinafter, an example for carrying out the water passage structure for a human hole according to the present invention will be described in detail with reference to the drawings.
1 is a longitudinal sectional view showing an example of an embodiment of a water passage structure for a human hole according to the present invention, FIG. 2 is a plan view of a main part of the water passage structure for a human hole shown in FIG. 1, and FIG. FIG. 4 is a cross-sectional explanatory view showing another example of the flowing water guide cover, and FIG. 5 is a cross-sectional explanatory view showing another example of the flowing water guide cover.

  The water passage structure of the human hole in this example is provided with an outlet 4 of the upstream pipe 3 and an inlet 6 of the downstream pipe 5 facing the outlet 4 on the wall surface 2 of the human hole 1. A flowing water guide cover 9 formed in a substantially semicircular shape is fixed to a groove-shaped invert 8 that connects the outlet 4 of the upstream pipe 3 and the inlet 6 of the downstream pipe 5 to the bottom 7.

The running water guide cover 9 has an inner diameter (radius) R1 on one end side 10 that is equal to or larger than an outer diameter (radius) R2 of the upstream pipe 3, and an inner diameter (radius) R3 on the other end side 11 is an inner diameter ( It is formed in a substantially semi-conical cylinder shape having a radius of R4 or more and an outer diameter R5 (radius) or less (hereinafter, the outer diameter and the inner diameter all mean the radius).
The length L1 of the flowing water guide cover 9 is such that when the one end side 10 of the flowing water guide cover 9 is brought into contact with the outlet 4 of the upstream pipe 3, the other end 11 and the inlet 6 of the downstream pipe 5 are In the meantime, it has a length that allows a space S necessary for inspection of the piping to be opened. In this example, the length L1 of the flowing water guide cover 9 is set within a range of 40% to 60% of the internal diameter R6 of the human hole 1.

Moreover, although the inner surface of the flowing water guide cover 9 is a smooth surface in this example, linear fins 12 (see FIG. 4) and spiral fins 12 (see FIG. 5) are formed in the direction of water flow. It is preferable.
In addition, flanges 13 and 14 are provided on the edge of the one end side 10 and both longitudinal sides of the running water guide cover 9 so as to face outward, and the hooks 13 and 14 have screw nails for fixing (see FIG. (Not shown) is provided with a hole 15 for insertion.

The flowing water guide cover 9 configured in this manner covers the invert 8, and the outlet 4 of the upstream pipe 3 is provided on the wall surface 2 of the human hole 1 whose one end 10 is opened by the outlet 4 of the upstream pipe 3. It is fixed so as to cover it.
The material of the flowing water guide cover 9 is not particularly limited as long as it has metal, plastic, or any other strength that can withstand water pressure.

  According to the water passage structure of the human hole according to the present invention configured as described above, rainwater flows in a concentrated manner in the sewage pipe, and the undulated water flows through the upstream side pipe 3 and the downstream side pipe 5 to the pipe 50. %, The inner diameter R1 of the one end side 10 of the flowing water guiding cover 9 is equal to or larger than the outer diameter R2 of the upstream pipe 3, so that the outlet 4 of the upstream pipe 3 The water that has flowed into the flowing water guiding cover 9 has a reduced flow velocity and an increased pressure at one end side 10 of the flowing water guiding cover 9.

The flowing water guide cover 9 is formed in a substantially semi-conical cylindrical shape in which the inner diameter R3 on the other end side 11 is not less than the inner diameter R4 of the downstream pipe 5 and not more than the outer diameter R5. In the process of flowing into the guide cover 9, the water flowing into the other end side 11 is squeezed toward the center and becomes high pressure, and the undulation is suppressed and flows out from the other end side 11 of the flowing water guide cover 9 with a stable pressure. The water flowing out from the other end side 11 of the guide cover 9 is restrained from being diffused low and actively guided to the inlet 6 of the downstream pipe 5 at a high speed.
Thereby, the water flow effect to the inflow port 6 of the downstream side pipe 5 is enhanced, and the vortex caused by the water flowing into the human hole 1 from the other end side 11 of the water flow guide cover 9 colliding with the wall surface 2 of the human hole 1. The generation of water can be suppressed to a low level, the loss due to the water overflowing from the invert 8 can be reduced, and the rise of the water level in the human hole 1 can be prevented.

  In addition, when linear fins 12 and spiral fins 12 are formed on the inner surface of the water flow guide cover 9 in the water flow direction, the straightness of the water flowing to the other end side 11 of the water flow guide cover 9 is improved. Then, the water flowing out from the other end 11 of the flowing water guide cover 9 is more actively guided to the inlet 6 of the downstream pipe 5, and the water flow effect to the inlet 6 of the downstream pipe 5 is achieved. And the generation of vortices caused by the water flowing into the human hole 1 from the other end side 11 of the flowing water guide cover 9 colliding with the wall surface 2 of the human hole 1 can be further reduced.

1 human hole 2 wall surface 3 upstream pipe 4 outlet 5 downstream pipe 6 inlet 7 bottom 8 invert 9 flowing water guide cover 10 one end side 11 other end side 12 fin 13, 14 flange 15 hole

Claims (2)

On the wall surface of the human hole, an outlet of the upstream pipe and an inlet of the downstream pipe are provided opposite to the outlet, and an outlet of the upstream pipe and an inlet of the downstream pipe are provided at the bottom. In the water passage structure of a human hole provided with a groove-shaped invert that connects
The inner diameter of the one end side is set to a diameter greater than or equal to the outer diameter of the upstream pipe, and the inner diameter of the other end side is formed to be a substantially semi-conical cylinder shape having a diameter greater than or equal to the inner diameter of the downstream pipe and less than or equal to the outer diameter. Covering the invert with a running-water guide cover having a length that allows a space necessary for inspection of the pipe between the other end side and the inlet of the downstream pipe when being brought into contact with the outlet of the upstream pipe. The one end side of the water flow guide cover is fixed to the side wall surface of the human hole where the outlet of the upstream pipe opens so as to cover the outlet of the upstream pipe.   The human hole water passing structure according to claim 1, wherein fins are formed on an inner surface of the water flow guide cover in a direction of water flow.

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