JP2004100284A - Energy dissipator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an energy dissipator having a structure capable of securing a washing out force capable of flushing out sludge or the like settled on the bottom face of the energy dissipator tank. <P>SOLUTION: The energy dissipator is provided with an energy dissipator tank 1 in which a inflow opening 11 and a outflow opening 12 are formed. An energy dissipating means ( energy dissipating wall 2) for dissipating the water stream flowed in the inside of the energy dissipator tank 1 from the inflow opening 11 is arranged. The pipe bottom of the outflow pipe 102 connected to the outflow opening 12 of the energy dissipator tank 2 is positioned at a higher level than the bottom face 10 of the energy dissipator tank. The bottom of the inflow pipe 101 connected to the inflow opening 11 is set higher than the pipe bottom of the outflow pipe 102. In this way, the head in the case of a little flow rate or the head from the bottom of the inflow pipe 101 to the reservoir water level (the pipe bottom level of the outflow pipe 102) is made large and rushing speed into the reserved water is made faster. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a damping device (discharge device) used to reduce a high-speed water flow discharged from a sewer such as a sewer pipe (inclined pipe) provided on a slope.
[0002]
[Prior art]
Sewage discharged from sewage pipes and the like installed on slopes has a high speed, and if discharged as it is, there is a risk that facilities such as public pipes and pump towers will be damaged. Therefore, it is necessary to provide a facility for reducing the energy of the high-speed water flow.
[0003]
As a device for reducing the discharge vein of the high-speed water flow, a dyke is known. As a damper, a sill or weir is installed inside the damping tank, and the kinetic energy of the water flowing out of the drainage pipe such as an inclined sewer into the damping layer is damped by the jumping phenomenon. (For example, see Patent Document 1).
[0004]
[Patent Document 1]
JP 2001-323560 A
[Problems to be solved by the invention]
By the way, in the water-discharge type or other structure of the energy damper, there is a possibility that sludge or the like is deposited on the bottom surface in the energy damper. Even if sludge accumulates in the deenergization tank, the problem is that when the inflow of sewage (sewage / rainwater) into the deenergization tank has a large flow rate, the accumulated sludge will flow out of the tank. However, when the inflow amount is a small flow rate, a sufficient flow velocity (sweep force against sludge and the like) cannot be obtained, so that sedimentary sludge and the like remain.
[0006]
The present invention has been made in order to solve such a problem, and even if the inflow amount of sewage or the like into the deenergization tank is a small flow rate, the sludge and the like deposited on the bottom surface of the deenergization tank are discharged. It is an object of the present invention to provide a damping device having a structure capable of securing a tractive force capable of performing a sweeping operation.
[0007]
[Means for Solving the Problems]
The energy damper of the present invention is an energy damper used to attenuate a high-speed water flow discharged from a sewer such as a sewer pipe, and includes a water damper having an inlet and an outlet formed therein, Discharge reducing means for reducing the flow of the water flowing from the inflow port is disposed inside the energy reducing tank, and the bottom of the outflow pipe connected to the outlet of the energy reducing tank is reduced. The bottom of the inflow pipe connected to the inlet of the deenergization tank is disposed at a position higher than the bottom of the power tank, and the bottom of the inflow pipe connected to the outlet of the deenergization tank is positioned higher than the pipe bottom of the outflow pipe connected to the outlet. It is characterized by:
[0008]
According to the energy damper of the present invention, the pipe bottom of the outflow pipe connected to the outlet of the energy damping tank is arranged at a position higher than the bottom surface of the energy damping tank, and the pipe of the inflow pipe connected to the water inlet is further provided. Since the bottom is higher than the bottom of the outflow pipe, the head at a small flow rate, that is, the height from the bottom of the inflow pipe to the level of the stored water (the bottom of the outflow pipe) can be increased. As a result, the flow velocity into the stored water increases, and a sufficient sweeping force can be secured.
[0009]
In the energy damper of the present invention, a water guide groove extending from the inlet to the outlet may be formed on the bottom surface of the energy damper. By providing the water guide groove in this way, a water flow that flows along the water guide groove at a small flow rate is generated, so that the sweeping force for sludge and the like can be increased.
[0010]
In the energy dissipation device of the present invention, the outflow pipe connected to the outflow port of the energy dissipation tank has an inflow pipeline having a diameter corresponding to the outflow port, and an enlarged pipeline having a diameter larger than the inflow pipeline. Preferably, a stepped outflow tube is used. The following effects can be achieved by using such a stepped outflow pipe.
[0011]
First, the diameter of the outlet is slightly smaller than the planned discharge (so that it is full). This is to achieve higher deceleration effect by systematically raising the upper part in the deceleration tank, but if there is more resistance than necessary, the water level rise in the deenergization tank will increase and overflow will occur. May occur. On the other hand, if a stepped outflow pipe with a margin for the planned flow rate is used, there is no space above the expanded pipe downstream, so that unnecessary resistance is not generated.
[0012]
When such a stepped outflow pipe is used, if an exhaust passage (for example, an exhaust pipe) communicating the upper part in the outflow pipe and the upper part in the deenergization tank is provided, the water level of the enlarged pipe of the outflow pipe is increased. Can be prevented from rising, and the enlarged pipeline can be prevented from being full.
[0013]
As a specific example of the energy damping device of the present invention, a structure in which an energy damping wall is arranged at a position facing the inflow port inside the energy damping tank can be cited. In addition, a configuration in which a dam plate is disposed between the energy reduction wall and the outflow port to further enhance the energy reduction effect can be cited.
[0014]
The energy damper of the present invention can be applied to each sewage of sewage or rainwater, or to a manhole where sewage and rainwater are combined.
[0015]
In addition, the energy damper of the present invention is not limited to manholes for sewage, but is also applicable to manholes installed in various pipes and sewers that discharge high-speed water flow, or other facilities that discharge high-speed water flow. .
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0017]
1 and 2 are a central longitudinal sectional view and a plan view of an embodiment of the present invention, respectively. 3 and 4 are a sectional view taken along the line AA and a sectional view taken along the line BB of FIG. 1, respectively.
[0018]
The energy dissipating device of this example is a device for imparting an energy dissipating function to a manhole laid downstream of a sewer pipe (inclined piping) installed on a slope, and is disposed in the energy dissipating tank 1 and the inside thereof. And an inflow block 3.
[0019]
The energy-reducing tank 1 is made of, for example, FRP, and a PE sheet (not shown) is adhered to the surface (the surface of flowing water). The deenergization tank 1 is provided with an inlet 11 and an outlet 12. The inflow port 11 is arranged near the center in the height direction of the energy dissipation tank 1. The bottom surface of the outflow port 12 (the bottom of the outflow pipe 102) is arranged at a position higher than the bottom surface 10 of the energy dissipation tank 1.
[0020]
The positional relationship between the inflow port 11, the outflow port 12, and the bottom surface 10 of the energy dissipation tank 1 is such that the height of the bottom surface of the outlet port 12 (the bottom of the outflow pipe 102) with respect to the bottom surface 10 of the energy dissipation tank 1 is, for example, 100 to 100. The height of the bottom surface of the inflow pipe 101 (the bottom of the inflow pipe 101) with respect to the bottom surface of the outflow port 12 (the bottom of the outflow pipe 102) is, for example, 750 to 1400 mm.
[0021]
At the center of the bottom surface 10 (the center in the width direction), a water guide groove 13 extending in a uniform cross section from the inflow port 11 side to the outflow port 12 side is provided in the energy reduction tank 1. The cross-sectional shape of the water guide groove 13 is an inverted trapezoid, and the groove depth is, for example, about 30 mm.
[0022]
The energy dissipation tank 1 is not limited to a resin such as FRP and may be made of concrete.
[0023]
The damping wall 2 is arranged in a state facing the inflow port 11. The energy-attenuating wall 2 has an inclined wall 21 and a hanging wall 22 integrally formed, and the inclined wall 21 faces the inflow port 11. The energy reduction wall 2 is supported by the wall of the energy reduction tank 1.
[0024]
The inflow block 3 is disposed directly below the inflow port 11. The inflow block 3 is for forming a flow path when a small amount of water flows from the inflow port 11, and is integrally formed with a round portion 31 connected to the inflow port 11 and an inclined portion 32 therebelow.
[0025]
At the center in the width direction of the inflow block 3, a water guide groove 33 extending in a uniform cross section from the upper end of the round portion 31 to the lower end of the inclined portion 32 is provided. The water guide groove 33 has the same cross-sectional shape and depth as the water guide groove 13 of the energy attenuating tank 1, and the front end (the lower end of the inclined portion 32) is located at the rear end of the water guide groove 13 of the energy attenuating tank 1. It is connected.
[0026]
As shown in FIG. 1, the energy damper having the above structure is installed at the bottom in a manhole (not shown), and an inflow pipe (sewage upstream pipe) 101 is connected to the inflow port 11 of the energy damping tank 1. An outflow pipe (sewage downstream pipe) 102 is connected to the outflow port 12.
[0027]
The inflow pipe 101 is formed with a horizontal conduit 111 extending horizontally toward the inflow port 11 of the energy dissipation tank 1.
[0028]
The outflow pipe 102 has an outflow pipe 121 having a diameter corresponding to the inflow port 11 of the energy dissipation tank 1 (a diameter corresponding to a planned flow rate downstream), and an enlarged pipe 122 having a diameter larger than the outflow pipe 121. A stepped outflow pipe in which is formed is used. The bottom surface of the outflow line 121 of the stepped outflow tube 102 and the bottom surface of the enlarged line 122 coincide with each other, so that the inner top of the enlarged line 122 is positioned with respect to the inner top of the outflow line 121. It is higher by the amount corresponding to the caliber difference (inner diameter difference).
[0029]
An exhaust pipe 103 is connected to the outflow pipe 102. One end of the exhaust pipe 103 communicates with the upper part in the energy reduction tank 1, and the other end communicates with the upper part of the outflow pipe 102 in the enlarged conduit 122.
[0030]
In the present embodiment, in the installation state of FIG. 1, when the sewage (rainwater or the like) flowing into the energy dissipation tank 1 from the inflow port 11 has a large flow rate or a medium flow rate, the inflow water faces the inflow port 11. The kinetic energy is attenuated by hitting the energy-attenuating wall 2 provided. The water flow after the energy reduction passes through the energy reduction tank 1 and flows out of the outlet 12 to the outflow pipe 102. Further, when the amount of water flowing into the deenergization tank 1 is a large flow rate or a medium flow rate, the flow velocity in the deenergization tank 1 is sufficiently high, so that sludge deposited on the bottom of the deenergization tank 1 is removed. The water can flow out from the outlet 12 to the downstream side.
[0031]
On the other hand, when the amount of inflow water into the deceleration tank 1 is a small flow rate, the sewage flowing into the deenergization tank 1 from the inflow port 11 flows along the water guide groove 33 of the inflow block 3 as shown in FIG. The water drops and enters the stored water (the liquid level is at the level of the bottom surface of the outflow port 12) in the deceleration tank 1, and flows along the water guide groove 13 on the bottom surface of the deenergization tank 1. At this time, since the head from the inflow port 11 of the deceleration tank 1 to the liquid level of the stored water is large, the flow velocity in the deenergization tank 1 is set at a flow rate (a flow rate capable of obtaining a sweeping force for sludge and the like). For example, 0.3 m / s or more) can be secured.
[0032]
In this embodiment, since the stepped outflow pipe 102 composed of the outflow pipe 121 and the enlarged pipe 122 is connected to the outflow port 12 of the energy dissipation tank 1, as shown in FIG. On the other hand, even when the outflow pipe 121 is in a full state, the flow becomes large enough to have a space in the upper part of the enlarged pipe 122, so that the resistance does not become more than necessary and the water level in the deenergization tank 1. It is possible to prevent overflow from occurring due to the rise.
[0033]
Further, since the exhaust pipe 103 communicating with the upper part of the expansion pipe 122 of the outflow pipe 102 is provided, the water level of the expansion pipe 122 of the outflow pipe 102 does not rise, and the expansion pipe 122 is full. Can be prevented.
[0034]
7 to 9 show another embodiment of the present invention. 7 and 8 are a vertical sectional view at the center and a plan view of the embodiment. FIG. 9 is a sectional view taken along line CC of FIG.
[0035]
This embodiment is characterized in that a dam plate 4 is provided inside the energy dissipation tank 1 to further enhance the energy dissipation effect.
[0036]
The weir plate 4 is disposed between the energy reduction wall 2 and the inflow port 11. In addition, the weir plate 4 is arranged in a state where a space 5 is left between the damper tank 1 and the bottom surface 10, and the amount of water flowing into the deenergization tank 1 is small (the amount of water that does not exceed the weir plate 4). In this case, the inflow water flows out of the outlet 12 through the space 5 without hitting the weir plate 4. In addition, the dam board 4 is supported by the wall body of the energy damper 1.
[0037]
In the above embodiment, the outflow port 12 of the energy-reducing tank 1 is provided at a position facing the energy-reducing wall 2 (inlet 11). However, the present invention is not limited to this. For example, as shown in FIG. Alternatively, the outlet 12 may be provided on the side of the energy-reducing tank 1 so as to flow out in a direction orthogonal to the direction of inflow into the energy-reducing tank 1.
[0038]
【The invention's effect】
As described above, according to the present invention, there is provided a deceleration tank having an inlet and an outlet formed therein, and a deceleration tank for reducing the flow of water flowing from the inlet into the deenergization tank. In the energy-dissipating device in which the power-supplying means is arranged, the pipe bottom of the outflow pipe connected to the outlet of the power-reducing tank is arranged at a position higher than the bottom of the power-reducing tank, and the inlet of the inflow pipe connected to the inlet is further connected. Because the bottom of the pipe is higher than the bottom of the outflow pipe, even if the amount of inflow of sewage or the like into the deenergization tank is small, sludge accumulated on the bottom of the depletion tank can be discharged. Possible sweeping force can be ensured.
[Brief description of the drawings]
FIG. 1 is a central longitudinal sectional view of an embodiment of the present invention.
FIG. 2 is a plan view of the embodiment of the present invention.
FIG. 3 is a sectional view taken along line AA of FIG. 1;
FIG. 4 is a sectional view taken along line BB of FIG. 1;
FIG. 5 is an operation explanatory view of the embodiment of the present invention.
FIG. 6 is an operation explanatory view of the embodiment of the present invention.
FIG. 7 is a central longitudinal sectional view of another embodiment of the present invention.
FIG. 8 is a plan view of another embodiment of the present invention.
9 is a sectional view taken along the line CC in FIG. 7;
FIG. 10 is a plan view of another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF REFERENCE NUMERALS 1 energy dissipation tank 10 bottom surface 11 inflow port 12 outflow port 13 water guide groove 2 energy reduction wall (power reduction means)
21 inclined wall 22 hanging wall 3 inflow block 31 round portion 32 inclined portion 33 water guide groove 4 weir plate 101 inflow pipe 111 horizontal pipe 102 outflow pipe 121 outflow pipe 122 enlarged pipe 103 exhaust pipe

Claims (6)

A damper used to reduce high-speed water discharged from sewers and other sewers,
A deceleration tank having an inflow port and an outflow port, wherein a deenergization means for deenergizing the flow of water flowing from the inflow port is disposed inside the deenergization tank; The bottom of the outflow pipe connected to the outlet of the tank is disposed at a position higher than the bottom surface of the deenergization tank, and the bottom of the inflow pipe connected to the inlet of the deenergization tank is connected to the outlet. A damper characterized by being located higher than the bottom of the outflow pipe. The energy damper according to claim 1, wherein a water guide groove extending from the inflow side to the outflow side is formed on a bottom surface of the energy dissipation tank. As the outflow pipe connected to the outflow port of the energy dissipation tank, a stepped outflow pipe having an inflow pipe having a diameter corresponding to the outflow port and an enlarged pipe having a diameter larger than the inflow pipe is used. The energy damper according to claim 1, wherein: The energy damper according to claim 3, further comprising an exhaust passage communicating between an upper part of the energy dissipation tank and an upper part of the outflow pipe connected to the outlet. The energy damper according to any one of claims 1 to 4, wherein an energy damping wall is disposed at a position facing the inflow port inside the energy damping tank. The damper according to claim 5, wherein a dam plate is disposed between the damping plate and the outlet.

Images