JP3648157B2 - Destructor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a depressurization method used for depressurizing a high-speed water flow discharged from a pipe rod such as a sewer pipe (inclined pipe) piped on an inclined ground.
[0002]
[Prior art]
Since the sewage discharged from the sewage pipes piped on the slope is high-speed, if it is discharged as it is, there is a risk of damaging facilities such as public pipes and pump towers. For this reason, it is necessary to provide equipment for reducing the energy of the high-speed water flow.
[0003]
Reduction equipment is known as equipment to reduce the discharge water vein of high-speed water flow. For example, as shown in FIG. 16, a weir 102 is provided in the downstream part of the depressing tank (reducing pond) 101, and the kinetic energy of the water flowing out from the pipe 103 such as an inclined sewage pipe is used for the jumping phenomenon. There is a jumping type depressurizer that depressurizes by. In such a water jump type depressurization method, an auxiliary structure that collides and disperses the water flow such as a baffle pier or a sill is provided in the water jump vortex region upstream of the weir 102 to increase the derating effect. Yes.
[0004]
[Problems to be solved by the invention]
By the way, in the energy reducing work having the structure shown in FIG. 16, in order to obtain a sufficient power reducing effect, it is necessary to increase the water jump length L (the length necessary for causing the water jump). There is a problem that the scale of will become large.
[0005]
In addition, in the depressurization work having the structure shown in FIG. 16, the water flow flowing out from the pipe rod 103 is released in a jetting manner into the depressurization tank 101, so that the amount of air taken from the pipe rod 103 into the depressurization tank 101 There are many. In particular, when there is a large amount of sewage flowing into the pipe rod 103 and the water flow in the pipe is in a jet (jet flow) state, the amount of air entrained into the depressurization tank 101 becomes very large. Exhaust equipment such as ventilation holes is required. In addition, since the entrained air from the sewage pipe or the like has an odor, there is a problem that if the exhaust air is exhausted to the outside, a bad odor will drift around the depressurizer.
[0006]
Here, in the jump water type depressurization work, since the weir is provided in the depressurization tank, there is a possibility that sewage or the like stays in the depressurization tank. There is no problem in the mechanism of depressurization even if staying occurs in the depressurization tank, but it cannot be said that the situation is favorable in terms of generation of malodors, hygiene, etc. Therefore, a structure that does not cause staying is desired.
[0007]
The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a reducer having a structure that is small in size and has a small amount of air entrainment in a reducer tank and that is unlikely to cause retention of sewage or the like. To do.
[0008]
[Means for Solving the Problems]
The depressurizer of the present invention is a depressurizer that is used to depressurize a high-speed water flow discharged from a pipe such as a sewer pipe piped on an inclined land, and has a flow inlet and an outlet. And a weir disposed at a predetermined interval in front of the outflow port of the depressurization tank, and the weir has a through hole or a slit communicating the inflow port side and the outflow port side. with both the inlet and outlet of the energy dissipation tank characterized by Rukoto are located below the upper end of the weir.
[0009]
In the energy reducing work of the present invention, the sewage flowing through the inflow pipe flows into the inside through the inlet of the energy reducing tank. The water flow that flows into the depressurization tank becomes a rising vortex by the weir in the depressurization tank, rises upward along the weir, flows over the weir and flows into the outflow pipe.
[0010]
As described above, in the energy reducing work of the present invention, the water flow that has flowed into the power reducing tank is forcibly raised by the weir, thereby diverging (decreasing) the kinetic energy of the water flow in the height direction of the power reducing tank. Therefore, even if the distance between the inlet of the depressurization tank and the weir is short, a sufficient demagnetization effect can be obtained.
[0012]
Moreover, in the energy dissipator of the present invention, since the disposed below the upper end of the weir the inlet of stilling tank, in the state in which flowing water to the stilling tank is flowed overflow weirs, Kanmizo The jet water from the water flows into the water stored in the depressurization tank. As a result, even if a large amount of air is entrained from the pipe rod by the jet, the entrained air is prevented from entering the depressing tank due to the presence of water in the depressurizing tank, and most of it is returned to the pipe rod. It is. A part of the entrained air enters into the stored water in the depressurization tank and breaks off from the surface of the water. However, since the amount is very small, it is not necessary to provide an exhaust facility.
[0013]
As described above, when sewage flows into the pipe, the sewage rises at the front of the weir in the reduction tank, flows out from the through hole (or slit) provided in the weir, and enters the inflow pipe. . When a large amount of sewage or the like flows into the reduction tank, the sewage flows over the weir and flows into the outflow pipe regardless of the presence of the through hole (or slit) provided in the weir.
[0014]
On the other hand, when the amount of water that flows from the pipe rod into the suppression tank is small (the amount of water that does not rise at the front of the weir), the sewage that flows into the suppression tank can pass through the through holes ( Or, it passes through the slit) and flows into the outflow pipe, so that sewage or the like does not stay in the depressurization tank.
[0015]
In addition, it is preferable that the through hole or slit provided in the weir has a size that allows filth contained in sewage or the like to pass through.
[0016]
In the de-energization work of the present invention, if a weir whose surface on the inlet side is curved is used as a weir to be arranged in the de-energization tank, the diffusion effect of the water flow increases, and the de-energization effect in the de-energization tank Can be further increased.
[0017]
In the energy reducing work of the present invention, it is preferable to form a horizontal flow path extending horizontally toward the inlet on the upstream side of the inlet of the energy reducing tank. If such a horizontal flow path is provided, sewage or the like flowing through the inflow pipe flows as a horizontal flow into the depressurization tank, so that the depressurization effect can be further enhanced.
[0018]
In the energy reducing work of the present invention, an air bypass passage may be provided that communicates the upper part of the energy reducing tank and the inside of the inflow pipe connected to the inlet of the energy reducing tank. You may provide the air bypass channel | path which connects the upper part in a power tank and the pipe | tube inside of the outflow pipe connected to the outflow port of a depressurization tank. Furthermore, both the inflow side air bypass passage and the outflow side air bypass passage may be provided.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0020]
FIG. 1 is a longitudinal cross-sectional view of an embodiment of a depressurizer according to the present invention. FIG. 2 is a horizontal sectional view of the embodiment. FIG. 3 is a sectional view taken along line XX in FIG.
[0021]
The energy reducing work in this example is a pressure reducing work laid on a sewage pipe (tilted pipe) piped on an inclined ground, and includes a pressure reducing tank 1 and a weir 2 disposed therein.
[0022]
The suppression tank 1 is made of concrete, and is provided with an inlet 1a and an outlet 1b. Note that the energy reducing tank 1 is not limited to concrete.
[0023]
The weir 2 is disposed in front of the outlet 1b with a predetermined interval. An inclined surface 2 a is formed at the bottom of the weir 2. The inclined surface 2a is formed for the purpose of efficiently guiding the direction of the water flow flowing into the depressing tank 1 from the inlet 1a upward (vertical direction).
[0024]
The dam 2 is provided with a through hole 2b, and the upstream side and the downstream side of the dam 2 communicate with each other through the through hole 2b. In addition, the size of the through hole 2b is set to a size that allows dirt and the like contained in sewage to pass through, for example, about φ50 mm to φ100 mm. Further, the shape of the through hole may be an ellipse, a quadrangle, etc. in addition to a circle.
[0025]
An inflow pipe (sewage pipe) 3 and an outflow pipe 4 are connected to the inflow port 1a and the outflow port 1b of the depressurization tank 1, respectively. The inflow pipe 3 is formed with a horizontal pipe line 30 that extends horizontally toward the inlet 1 a of the power reducing tank 1.
[0026]
The tube bottom 3 a of the inflow tube 3 is set to a height that substantially matches the bottom surface of the depressurization tank 1. The tube bottom 4 a of the outflow tube 4 is also set to a height that substantially matches the bottom surface of the depressurization tank 1.
[0027]
Next, the operation of this embodiment will be described.
[0028]
First, the direction of the sewage flowing through the inflow pipe 3 is changed in the horizontal conduit 30 before the inlet 1a of the depressurization tank 1, and flows into the depressurization tank 1 as a horizontal flow. The water flow that flows into the depressurization tank 1 becomes an upward vortex by the weir 2 in the depressurization tank 1, rises upward along the weir 2, overflows the weir 2, and flows into the outflow pipe 4. In the overflow state, a water surface shape as shown in FIG. 1 is formed, and the jump height H becomes very high.
[0029]
As described above, in this embodiment, the kinetic energy of the water flow is diverged (decreased) in the height direction of the depressing tank 1 by forcibly raising the water flow flowing into the depressing tank 1 by the weir 2. Therefore, even if the distance between the inlet 1a of the depressing tank 1 and the weir 2 is short, a sufficient depressing effect can be obtained. Therefore, although the height of the derating tank 1 is slightly increased, the scale of the entire derating process can be reduced.
[0030]
Furthermore, in this embodiment, as shown in FIG. 1, in a state where the inflow water to the depressurization tank 1 overflows the weir 2, that is, in a state where a large amount of sewage flows into the depressurization tank 1, Since the jet water from the inflow pipe 3 flows into the water stored in the depressurization tank 1, even if a large amount of air is taken toward the depressurization tank 1 by the jet flowing through the inflow pipe 3, The entrained air is prevented from entering the depressing tank 1 due to the presence of stored water in the depressing tank 1, and most of it is returned to the inflow pipe 3. A part of the entrained air enters the stored water in the depressurizing tank 1 and breaks off bubbles from the water surface. However, since the amount is very small, there is no need to provide an exhaust facility.
[0031]
Further, in this embodiment, when the amount of sewage flowing into the depressurization tank 1 from the inflow pipe 3 is small (the amount of water not exceeding the weir), the sewage flowing into the depressurization tank 1 passes through the weir 2. Since it passes through the hole 2 b and flows into the outflow pipe, sewage does not stay in the depressurization tank 1.
[0032]
In the above embodiment, as shown in FIG. 4, the surface of the weir 2 on the inlet 1b side may be processed into a gently inclined shape.
[0033]
Moreover, in the above embodiment, although the through-hole is formed in the weir, instead of this, as shown in FIGS. 5-7, the slit 21 cut | disconnected from the upper end of the weir 20 to the bottom part of the depressurization tank 1 is provided. It may be provided. The width of the slit 21 is determined in consideration of the size of filth contained in the sewage.
[0034]
In the above embodiment, as shown in FIGS. 8 and 9, a triangular block 5 may be provided at the center of the weir 2. If such a triangular block 5 is provided, it is possible to prevent the occurrence of water jump inside the outflow pipe 4, and to more effectively reduce the energy of the water flow that has flowed into the reduction tank 1. it can. The cross-sectional shape of the block may be a trapezoid or the like in addition to a triangle.
[0035]
Further, as shown in FIGS. 10 and 11, if the wall surface (surface on the inlet 1a side) of the weir 22 is a substantially spherical curved surface, the diffusion effect of the water flow is increased, and the deenergization in the depressurization tank is performed. The effect can be further enhanced.
[0036]
In the above embodiment, as shown in FIG. 12, the air bypass pipe 6 that communicates the upper part in the depressurization tank 1 and the inside of the inflow pipe 3 connected to the depressurization tank 1 is provided, and the depressurization is performed. The air (entrained air) that has entered the stored water in the tank 1 and has bubbled from the water surface may be returned to the inflow pipe 3. In addition, as shown in FIG. 13, an air bypass pipe 7 that communicates the upper part in the depressing tank 1 and the inside of the outflow pipe 4 connected to the depressurizing tank 1 is provided. Air (entrained air) that has entered the stored water and bubbled from the water surface may be released to the outflow pipe 4. Both the air bypass pipe 6 and the air bypass pipe 7 as shown in FIGS. 12 and 13 may be provided in the depressurization tank 1. The air bypass passage may be a vent formed in concrete.
[0037]
Here, in the above embodiment, although the horizontal pipe line 30 extended horizontally toward the inflow port 1a of the depressurization tank 1 is formed, this invention is not limited to this, For example, it shows in FIG. In this way, the inclined pipe (inflow pipe) 31 may be connected to the inlet 1a of the depressurization tank 1 as it is.
[0038]
Moreover, in the above embodiment, although the position of the inflow port 1a provided in the suppression tank 1 is made into the position facing the weir 2 (outflow port 1b), it is not restricted to this, For example, in the top view of FIG. As shown, the inlet 1a may be provided on the side of the depressurization tank 1.
[0039]
The depressurization work of the present invention is not limited to sewer pipes, but can be applied to various pipes and pipes that discharge high-speed water flow.
[0040]
【The invention's effect】
As described above, according to the de-energization work of the present invention, a weir is provided in the de-energization tank, and the water flow that has flowed into the de-energization tank is forced to rise by the weir, thereby Since it is configured to reduce the kinetic energy of the water flow in the height direction, the distance from the inflow portion of the power reducing tank to the weir can be shortened, and the scale of the entire power reducing work can be reduced. . Moreover, since the through-hole or slit which connects the inflow port side and the outflow port side is provided in the weir in the depressurization tank, sewage or the like hardly stays in the depressurization tank.
[0041]
Moreover, since the inlet of the depressurization tank is arranged below the upper end of the weir , when the inflow water to the depressurization tank overflows the weir, pipes such as sewer pipes (inflow pipe) ) Will flow into the water stored in the depressurization tank, and even if a large amount of air is taken from the pipe by the jet flowing through the pipe, However, the amount of water entering the depressurization tank is small, and problems such as exhaust equipment and bad odor can be solved.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an embodiment of a depressurization work of the present invention.
FIG. 2 is a horizontal cross-sectional view of the embodiment of FIG.
3 is a cross-sectional view taken along line XX in FIG.
FIG. 4 is a vertical cross-sectional view showing an example of a weir provided in the power reducing tank.
FIG. 5 is a vertical cross-sectional view of another embodiment of the energy reducing work of the present invention.
6 is a horizontal cross-sectional view of the embodiment of FIG.
7 is a YY sectional view of FIG. 6;
FIG. 8 is a vertical cross-sectional view of another embodiment of the energy reducing work of the present invention.
FIG. 9 is a horizontal cross-sectional view of the embodiment of FIG.
FIG. 10 is a longitudinal sectional view showing another example of a weir provided in the power reducing tank.
11 is a cross-sectional view taken along the line ZZ in FIG.
FIG. 12 is a longitudinal sectional view of another embodiment of the energy reducing work of the present invention.
FIG. 13 is a longitudinal sectional view of still another embodiment of the energy reducing work of the present invention.
FIG. 14 is a longitudinal cross-sectional view of still another embodiment of the energy reducing work of the present invention.
FIG. 15 is a horizontal sectional view of still another embodiment of the de-energizing work of the present invention.
FIG. 16 is a diagram schematically showing an example of a jump water type depressing work.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Reducer tank 1a Inlet 1b Outlet 2,20 Weir 2a Inclined surface 2b Through-hole 21 Slit 3 Inflow pipe 30 Horizontal pipe 3a Pipe bottom 4 Outflow pipe 4a Pipe bottom 5 Triangle block 6, 7 Air bypass pipe

Claims (4)

A de-energizing work used to de-energize high-speed water flow discharged from pipes such as sewage pipes piped on slopes,
A derating tank having an inlet and an outlet, and a weir arranged at a predetermined interval in front of the outlet of the depressurizing tank, the inlet and the outlet side communicating with the weir a through hole or slit is formed to, energy dissipator both the inlet and outlet of the energy dissipation tank, characterized that you have been placed below the upper end of the weir.   2. The de-energizing work according to claim 1, wherein a surface of the weir inlet side is curved.   3. The energy reducing work according to claim 1, wherein a horizontal flow path extending horizontally toward the inlet is formed on the upstream side of the inlet of the power reducing tank. 4.   Connected to the air bypass passage that connects the upper part of the depressing tank and the inside of the inflow pipe connected to the inlet of the depressurizing tank, or the upper part of the depressurizing tank and the outlet of the depressing tank One or both of the air bypass passages communicating with the inside of the pipe of the outflow pipe are provided.

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