JP2001032356A - Attenuation device of pipe culvert joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an attenuation device which has a structure as simple as possible in view of workability and economical efficiency and which can be easily installed in a standard type manhole. SOLUTION: Water stream from a steep pipe culvert 13 can be attenuated in an attenuation pit body 20 and poured into a gentle pipe culvert 14. In this case, a dispersion means of the water stream from the steel pipe culvert 13 and a sill part 27 attenuating the dispersed water stream 2 by a water splashing phenomenon and feeding it from a gap 28 to the gentle pipe culvert 14 side are provided in the bottom plate part of an attenuation pit body 20. The water stream dispersion means is constituted of a slanting bottom 25 and a dispersion protrusion 26 and two right and left sill parts 27 are formed to define the gap 28 at the center. The attenuation pit body 20 has a size to be installed in a manhole as it is.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for reducing the force of a water pipe connected between a steep sewage pipe upstream of a sewer and the like and a gentle sloping pipe downstream thereof so as to reduce the flow of water. It is about.

[0002]

2. Description of the Related Art In general, when pouring water from a steep culvert 13 into a gentle culvert 14, a device for reducing the force of the water flow is interposed at a connecting portion. In the case of rainwater, as shown in FIG. 9, a steep culvert 13 and a gentle culvert 14 are connected slightly above the bottom surface of the stormwater basin 15 through a deep stormwater basin 15 for storage. It is referred to as part 18. The vigorous water from the steep culvert 13 falls into the stored water in the storage part 18, the momentum is reduced, and flows into the gentle culvert 14.
The storage section 18 stores sludge 17 such as mud, pebbles, and garbage that has flowed from the steep culvert 13 together with water. Then, the sludge 17 is removed from time to time by removing the lid 16.

On the other hand, in the case of sewage, FIG.
As shown in (b), the invert main body 10 having a small depth is interposed, and between the steep culvert 13 and the gentle culvert 14,
The passage groove 12 is formed, and the top surface is covered with the lid 11. Then, the sewage having a strong momentum from the steep slope pipe 13 flows into the gentle slope pipe 14 through the passage groove 12. At this time, unlike FIG. 9, it is necessary to avoid storing sewage dirt, so that the passage groove 12 has a semicircular shape.

[0004]

The rainwater type shown in FIG. 9 cannot be used because sewage and dirt are stored in the storage section 18.

The sewage type shown in FIG. 8 does not accumulate sewage and dirt, but it is not enough to reduce the sewage force from the steep sewage system 13 and the sewage system 1
There was a case where it overflowed at the entrance to 4, and did not flow smoothly.

[0006] A first object of the present invention is to obtain a deenergizing device having a structure as simple as possible from the viewpoint of workability and economy. It is a second object of the present invention to provide a neutralization device which can be easily installed in a standard type manhole.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a steep culvert 1
In the energy reduction device at the pipe connecting portion, which reduces the water flow from the third in the energy reduction main body 20 and flows into the gentle inclination pipe 14, the bottom plate 24 of the energy reduction main body 20 has a steep slope pipe. Culvert 13
And a sill portion 27 which attenuates the dispersed water flow by a water jump phenomenon and sends the water flow from the gap 28 to the gentle slope conduit 14 side. And a dispersing ridge portion 26 extending from the bottom portion 25 in the direction of water flow and having a downwardly sloping portion to the left and right. The bottom plate portion 24 has a gap 28
Two sill portions 27 are formed on the left and right of the approximate middle portion of the sill portion.
The collision surface 29 on the upstream side and the side surface 33 forming the gap 28 stand upright, and the collision surface 29 has an angle such that the side close to the side plate 23 of the energy-dissipating basin main body 20 brings the water flow to the center. Wherein the central portion is substantially orthogonal to the water flow.

In the above configuration, the steep culvert 1
The strong current that has flowed from 3 is
It flows down while spreading slightly along the inclined bottom 25 of 0,
The water flow that has flowed down is sufficiently dispersed to the left, right, and center by the inclined surfaces on both sides of the dispersion protrusion 26 and the central horizontal plane. The water flow dispersed to the left and right collides with the collision surface portion 29 of the sill portion 27, causing a water jump phenomenon, and the water flow has a normal momentum. The water flow reduced by the water jumping phenomenon on both sides is collected at the center of the bottom plate portion 24 and sent downstream through the gap 28. The water that has passed through the gap 28 flows into the gentle slope pipe 14 through the groove 31 in a normal flow.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1 to FIG. 4, reference numeral 20 denotes an elongated box-shaped energy-dissipating basin main body including a front plate portion 21, a rear plate portion 22, a side plate portion 23, and a bottom plate portion 24, each of which is formed by FRP. . The front plate portion 21 and the rear plate portion 22 of the energy-saving basin body 20 are slightly wider than the diameters of the steep culvert 13 and the gentle culvert 14 to be connected, and when fitted into a manhole body 34 described later. , Manhole body 3
4 has the same arc shape as the inner wall. The manhole body 34 may be not only a circle but also a polygon such as a quadrangle and a hexagon, and other shapes. In such a case,
The front plate portion 21 and the rear plate portion 22 of the energy reduction measure main body 20 are not arc-shaped, but are linear, and have a shape that matches the inner wall of the manhole main body 34.

A U-shaped or circular front-plate-side pipe mounting portion 40 for fitting the steep culvert 13 is formed in the front plate portion 21 of the energy-reducing basin main body 20. Is formed with a U-shaped or circular rear plate side pipe mounting portion 41 for fitting the gentle slope pipe 14 therein. The front plate side pipe mounting portion 4 is provided on the bottom plate portion 24 of the energy dissipation measure main body 20.
An inclined bottom 25 of approximately 45 degrees is formed from the lower end of 0, and a dispersion ridge 26 extending from the inclined bottom 25 in the water flow direction is formed. This distributed ridge 2
Numeral 6 is for dispersing the water from the steep culvert 13 to the left and right. As shown in FIG. 4 (c), the central portion has a narrow flat portion, left and right descending inclined portions, and further a tip portion. And a downward slope. The inclined bottom part 25 and the dispersion ridge part 2
6 constitutes a water flow dispersing means.

As shown in FIG. 4 (b), sill portions 27 are formed on the left and right sides of the energy-reducing basin body 20 at a substantially middle portion of the bottom plate portion 24 so as to have a gap 28 at the center. In the sill portion 27, the collision surface portion 29 on the upstream side and the side surface portion 33 facing the gap 28 stand upright. Of these, the collision surface 2
9 has an angle such that the side close to the side plate portion 23 brings the water flow to the center, the center portion is substantially orthogonal to the water flow, and the water flow dispersed right and left by the dispersion ridges 26 collides with the collision surface portion 29. This causes the water to jump and reduce the momentum while approaching the center.

The widened portion 30 immediately behind the gap 28 is
As shown in FIG. 4 (a), although it has a square gutter shape, the gentle slope 1 becomes closer to the entrance of the gentle slope 14.
A groove 31 having a semicircular shape corresponding to the inner diameter of the groove 4 is formed. The slopes 32 on both sides of the groove 31 have the same height on the groove 31 side as the radius of the rear-plate-side tube mounting portion 41, and have a slope. The portion 32 gradually becomes higher toward the side plate portion 23 side. The height of the upper surface of the sill part 27 is
4 is a flat portion slightly lower than the diameter of the flat portion 4 and is continuous with the slope portion 32 through a slightly downwardly inclined portion rearward from the flat portion.

An anchor portion 35 is integrally provided on the lower surface of the bottom plate portion 24 of the energy reduction measure main body 20 in order to make the connection with the mortar 38 stronger when attached to the manhole main body 34.

Next, the incorporation into a standard manhole will be described. The mortar 38 is spread on the bottom of the manhole body 34 installed in the ground, and the energy-saving basin body 20 is placed on the mortar 38. At this time, the front plate 2
The front-plate-side tube mounting portion 40 in FIG. 1 faces the upstream-side tube mounting hole 39, and the rear-plate-side tube mounting portion 41 in the rear plate portion 22 faces the downstream-side tube mounting hole 39. The end of the steep culvert 13 is inserted from the upstream pipe mounting hole 39 into the front plate side pipe mounting portion 40, and the rear plate side pipe mounting portion 4 is inserted through the downstream pipe mounting hole 39.
1, the end of the gentle slope pipe 14 is inserted, and the mortar 38 is packed in the gap.
0, the steep pipe 13 and the gentle pipe 14 are fixed. Further, the mortar 38 is also packed between the outside of the side plate portion 23 of the energy reduction measure main body 20 and the inside of the manhole body 34. The mortar 38 between the outside of the side plate portion 23 and the inside of the manhole body 34 is inclined downward toward the center so that water that overflows from the energy dissipation body 20 or flows into the energy dissipation body 20 from above. Face. A connecting cylinder 36 is mounted on the manhole body 34, and a manhole cover 37 is placed on the upper surface thereof at the same height as the road.

Next, the action of reducing the momentum of the water flow will be described. Unless the inclined bottom part 25 and the dispersing ridge part 26 are formed, the strong current flowing from the steep culvert 13 tries to widen the water vein by the pressure of the water tapping surface of the bottom plate part 24 by free fall, Insufficient spread of water flow. In the present invention, the water flows down while spreading slightly along the inclined bottom portion 25 of the energy dissipation basin body 20, and the water flow that has flowed down is distributed to the dispersion ridge 2.
6 are sufficiently distributed to the left, right, and center by the inclined surfaces on both sides and the horizontal plane at the center.

The water flows dispersed to the left and right are formed on the slopes 3 on both sides.
2 and collide with the collision surface 29 of the sill 27. When the water collides with the sill portion 27, a water jump phenomenon occurs, and the water flow has a normal momentum. At this time, the collision surface 2
In No. 9, since the side plate portion 23 side is inclined toward the center, the water is guided to the center without generating a vortex at the time of jumping or accumulating sludge. The water flow reduced by the water jumping phenomenon on both sides and the water flowing from the flat portion of the dispersion ridge portion 26 are collected at the central portion of the bottom plate portion 24 and sent downstream through the gap 28. The water that has passed through the gap 28 flows into the gentle slope pipe 14 through the groove 31 in a normal flow.

The width of the gap 28 is desirably large in order for sediment and contaminants from the steep culvert 13 to flow without being clogged. The momentum needs to be reduced and is set according to the purpose of use.

If the amount of water from the steep culvert 13 is too large to pass through the gap 28, the water flows over the collision surface 29 of the sill 27, flows over the upper surface, and flows into the slopes 32 on both sides of the groove 31. Here, it is brought to the center and guided to the gentle slope pipe 14.

FIG. 7 shows the average water level when using the de-energizing device of the pipe connecting section of the present invention. The lower characteristic lines indicate the planned water volume from the steep pipe 13. The average water level in the center of the damping basin body 20 (dashed-dotted line), the water level on the left bank (solid line), and the water level on the right bank (dotted line) are almost the same at the time of pouring. It is shown that. The upper characteristic lines indicate the average water level at the center of the energy-dissipating basin body 20 (dashed-dotted line), the water level on the left bank (solid line), and the water level on the right bank when four times the planned water volume flows from the steep culvert 13. Water level (dotted line). In this case, the water jumps over the collision surface portion 29 at the sill portion 27 and the water level is slightly waving, indicating that the deenergizing effect is sufficiently exhibited even at four times the planned water volume.

In the above-described embodiment, an example is shown in which the energy-reducing basin body 20 is linear, and the steep culvert 13 and the gentle culvert 14 are mounted at positions 180 ° opposite to each other. It is not limited, and as shown in FIG.
0 may be configured such that the water inlet side 42 connected to the steeply sloping conduit 13 and the water outlet side 43 connected to the gentle sloping conduit 14 are angled at an angle of θ degrees. Also,
It may be a curved one instead of a dogleg.

In the above-described embodiment, an example is shown in which one steep sloping pipe 13 and one gentle sloping pipe 14 are attached to the energy-reducing basin body 20, however, the present invention is not limited to this. As shown in FIG. 6, the one for connecting one gentle slope pipe 14 and two steep slope pipes 13 to the energy-reducing basin body 20.
One water outlet side 43 and two water inlet sides 42a, 4
It may be formed in a Y-shape so that 2b can be attached. In this case, the two water inlet side 42a, 42
The b is provided with an inclined bottom part 25 and a dispersing ridge part 26, respectively, and each of the water flows is configured such that the respective flowing waters join immediately before the sill part 27 on the water outlet side 43, and are deenergized. Note that three or more water inlet ports 42 and one water outlet port 43 may be connected.

[0022]

The present invention is constructed as described above.
It has the following effects. (1) Means for dispersing the water flow from the steep culvert 13 to the bottom plate portion 24 of the energy-saving basin body 20, and a sill part for attenuating the diverged water flow by a jumping phenomenon and sending the water flow from the gap 28 to the gentle culvert 14 side. 27, the vigorous water flow from the steep culvert 13 is reliably reduced and flows into the gently sloping culvert 14.

(2) Conventionally, a vigorous water flow that has flowed from the steep culvert 13 attempts to expand the water vein by the pressure of the water-floating surface at the bottom of the basin body by free fall, but the water flow is not spread widely. Will be enough. On the other hand, in the present invention, the water flow dispersing means includes an inclined bottom 25 from the lower end of the front plate side pipe mounting portion 40, a water extending direction extending from the inclined bottom 25, and a downwardly inclined right and left. Dispersion ridge portion 26 having a portion
Therefore, the water flow falls while spreading slightly along the inclined bottom portion 25, and the water flow that has flowed down is sufficiently dispersed to the left and right on the inclined surfaces on both sides of the dispersion protrusion 26, and the water flow dispersed to the left and right is Then, the water flows toward the inner walls of both slope portions 32 and collides against the collision surface portion 29 of the sill portion 27, causing a water jump phenomenon, and the water flow has a normal momentum.

(3) Two sill portions 27 are formed on the left and right sides of a substantially middle portion of the bottom plate portion 24 so as to have a gap 28 at the center. 28, and the collision surface 29 has an angle such that the side close to the side plate 23 of the energy-saving basin main body 20 brings the water flow to the center, and the center portion is opposed to the water flow. Since they are substantially perpendicular to each other, the water jumping phenomenon is reliable, and no sewage or dirt is accumulated.

(4) The energy-reducing basin body 20 can be formed into a simple structure with excellent workability and economy by forming by FRP.

(5) Two or more water inlet ports 42 and one water outlet port 43 are formed in one energy reduction basin body 20, and two or more steep culverts 13 and one gentle sloping pipe Culvert 14
And can be connected.

(6) The energy-reducing gusset main body 20 is formed to have a size that fits inside the standard type manhole body 34, and the energy-reducing gusset main body 20 is placed on the bottom of the manhole body 34. The front plate-side pipe mounting portion 40 in the front plate portion 21 of FIG.
And the rear plate side pipe mounting portion 41 of the rear plate portion 22 is provided with a pipe mounting hole 39 for mounting the gentle slope pipe 14.
, So it can be easily installed in a standard type manhole.

[Brief description of the drawings]

FIG. 1 is a cross-sectional plan view showing one embodiment of a state in which a discharge device for a sewer connection part according to the present invention is installed in a manhole body 34. FIG.

FIG. 2 is a longitudinal sectional view in FIG.

FIG. 3 is a partially cutaway perspective view showing one embodiment of the energy-reducing basin body 20 according to the present invention.

FIG. 4A is an end view taken along line BB in FIG. 1;
(B) is an end view taken along line CC in FIG. 1, and (c) is an end view taken along line DD in FIG. 1.

FIG. 5 is a cross-sectional plan view showing another embodiment of the de-energizing device of the conduit connection part according to the present invention.

FIG. 6 is a cross-sectional plan view showing still another embodiment of the device for reducing the energy of a sewer connection according to the present invention.

FIG. 7 is a view showing a characteristic line of an average water level by the energy dissipating device of the pipe connecting portion of the present invention shown in FIG. 1;

8A is a longitudinal sectional view showing a conventional sewage invert main body 10, and FIG. 8B is a sectional view taken along line AA in FIG. 8A.

FIG. 9 is a cross-sectional view of a conventional rainwater basin 15 for rainwater.

[Explanation of symbols]

10 ... invert body, 11 ... lid, 12 ... passage groove,
13 ... steep culvert, 14 ... gentle culvert, 15 ... rainwater basin,
Reference numeral 16: lid, 17: sludge, 18: storage unit, 20: energy-dissipating tub body, 21: front plate, 22: rear plate, 23: side plate,
Reference numeral 24: bottom plate portion, 25: inclined bottom portion, 26: dispersion ridge portion, 2
7 ... Sill part, 28 ... Gap, 29 ... Collision surface part, 30 ... Expansion part, 31 ... Groove part, 32 ... Slope part, 33 ... Side part, 34 ...
Manhole body, 35 ... anchor part, 36 ... connecting cylinder,
37: manhole cover, 38: mortar, 39: pipe mounting hole, 40: front plate side pipe mounting part, 41: rear plate side pipe mounting part, 42: water inlet side, 43: water outlet side.

Claims (8)

[Claims] 1. A front plate-side tube mounting portion 4 of a damping measure main body 20.
Water flow from steep culvert 13 connected to zero
0, and the rear plate side tube mounting portion 4
A deceleration device for a conduit connecting portion that is configured to flow into the gentle gradient conduit 14 connected to 1; a means for dispersing a water flow from the steep conduit 13 to the bottom plate portion 24 of the energy-reducing basin body 20;
A sill part (27) for attenuating the dispersed water flow by a jumping phenomenon and sending the diverged water flow from the gap (28) to the side of the gentle slope (14). 2. The energy-dissipating basin main body 20 has an elongated box shape with an upper surface opened. 42,
A sill portion 27 having a water flow dispersing means and a gap 28 is provided on the bottom plate portion 24.
The deenergizing device for a sewer connection part according to claim 1, wherein 3. The water flow dispersing means comprises a front plate side pipe mounting portion 4.
0, and a dispersing ridge portion 26 extending from the inclined bottom portion 25 in the flow direction of water and having a downwardly inclined portion. The device for reducing the power of a sewer connection according to claim 1 or 2. 4. Two sill portions 27 are formed on the left and right sides of a substantially middle portion of the bottom plate portion 24 so as to have a gap 28 at the center.
8, and the collision surface portion 29 has an angle such that the side close to the side plate portion 23 of the energy-saving basin body 20 brings the water flow to the center, and the center portion is opposed to the water flow. 4. The method according to claim 1, wherein the two are substantially perpendicular to each other.
An energy dissipating device for a pipe connection according to any one of the preceding claims. 5. The energy-saving basin body 20 is formed by FRP processing.
An energy dissipating device for a pipe connection according to any one of the preceding claims. 6. The water inflow side 4 of the energy dissipation basin body 20.
The flow path between 2 and the water outlet side 43 is formed in a straight line, a curved line, or at a predetermined angle, so that the steep culvert 13 and the gentle sluice 14 can be connected to each other linearly or at a predetermined angle. 6. A device for reducing the power of a sewer connection according to claim 1, 2, 3, 4, or 5. 7. A single energy-dissipating basin body 20 is formed with two or more water inlet ports 42 and one water outlet port 43,
The steep culvert 13 and one or more gentle culverts 14 can be connected to each other.
7. The device of claim 3, 3, 5, or 6, wherein the sewer connection is dissipated. 8. The energy-saving gusset main body 20 is formed to have a size that fits into a standard type manhole body 34, and the energy-saving gusset main body 20 is placed on the bottom of the manhole body 34. Front plate side tube mounting portion 4 in front plate portion 21
0 faces the pipe mounting hole 39 for mounting the steep culvert 13, and the rear plate side pipe mounting portion 4 in the rear plate portion 22.
3. The method according to claim 1, wherein the first pipe is fixed to a pipe mounting hole for mounting a gentle slope pipe.
8. The energy dissipating device for a pipe connecting part according to 3, 4, 5, 6, or 7.