KR102584463B1 - Aerator for pipe spillway - Google Patents

Abstract

The present invention relates to an air mixing device (aerator) installed in a pipe type spillway (10), wherein an arc-shaped groove (30) is formed on the inner peripheral surface of the pipe wall (20). , a ramp 25 is formed on the pipe wall 20 on the upstream side of the groove 30, a guide recess 35 is formed at the upper end of the groove 30 toward the upstream side, and grooves 30 are formed on both sides of the pipe wall 20. ), an arc-shaped blocking plate 40 is formed to isolate the groove 30 from the water flow.
Through the present invention, smooth and stable operation of the air mixing device for the spillway type spillway (10) is possible, thereby ensuring the stability of the water flow in the spillway (10) and preventing damage to the pipe wall (20) of the spillway (10). can be prevented, and the durability and performance of the spillway 10 can be improved.

Description

Air mixing device for irrigation canal type spillway {AERATOR FOR PIPE SPILLWAY}

The present invention relates to an air mixing device (aerator) installed in a pipe type spillway (10), wherein an arc-shaped groove (30) is formed on the inner peripheral surface of the pipe wall (20). , a ramp 25 is formed on the pipe wall 20 on the upstream side of the groove 30, a guide recess 35 is formed at the upper end of the groove 30 toward the upstream side, and grooves 30 are formed on both sides of the pipe wall 20. ), an arc-shaped blocking plate 40 is formed to isolate the groove 30 from the water flow.

A spillway is a waterway for discharging a large amount of water above a certain level for the safety of the reservoir. It is mainly installed to discharge reservoir inflow downstream without damaging the dam structure or auxiliary facilities in situations such as floods. .

These spillways can be classified into gated spillways and non-gated spillways depending on whether they can be controlled through floodgates, and can be classified into open channel type with a free water surface or pipe type with pressure flow depending on the hydraulic characteristics of the water flow in the waterway. However, regardless of the type, extreme flow velocities and flow rates are bound to occur in the water flowing through the spillway, and therefore the impact on the waterway main body as well as related auxiliary facilities has a completely different aspect from that of general waterway structures.

In particular, when the water pressure falls below the vapor pressure due to high velocity, the inherent gas is separated to form bubbles, and these bubbles are crushed by the surrounding water pressure, causing cavitation, which damages surrounding structures, to occur in the spillway. In a high-flow, high-velocity water flow, when a pressure flow below atmospheric pressure occurs, a kind of vacuum is created at the interface between the structure and the water flow, resulting in separation of waterway structures such as concrete, which may also occur in the spillway. You can.

Accordingly, in large spillways, in order to prevent damage to the spillway structure due to the above-mentioned phenomenon, an air inflow guideway in the form of a groove is formed on the surface of the waterway to allow external air to be supplied to the lower part of the water stream. is installed, and the prior art related to the Yeosu Air Entrainment Device includes Patent No. 653611.

Patent No. 653611, a conventional air mixing device for spillways, is a device applied to open-channel spillways. Not only is a free water surface formed in the water flow within the spillway, but the influence of the water flow is spread under the condition that the top of the waterway structure is completely exposed to the outside. Not only does it not work, but it operates under conditions in which external air can be freely utilized in a state that is completely unrelated to the physical behavior of the water flow.

In addition, the side walls of the waterway that make up the spillway as well as the bottom plate are completely exposed to the outside when the spillway is not in operation, so the type and specifications of the air mixing device can be freely selected, and easy construction is possible.

On the other hand, in the case of the spillway type spillway 10 as shown in FIGS. 1 to 3, the cross section of the waterway is completely enclosed by the pipe wall 20 in most sections of the spillway 10 facility, especially in Figure 1 As illustrated, in many cases the spillway 10 is constructed underground, not only is access to the internal structure of the spillway 10 limited, but also significant restrictions are inevitable on the type of air mixing device, and construction It also has difficult limitations.

Accordingly, the air mixing device in the conventional pipe type spillway 10 forms a groove 30 on a portion of the inner peripheral surface of the pipe wall 20 constituting the spillway 10, as shown in FIGS. 2 and 3. This induces air inflow from the air layer formed on the upper side of the spillway 10, but not only is a sufficient air mixing effect not expected, but also significant operational problems are involved.

First, as shown in Figures 2 and 3, the groove 30 type air mixing device of the conventional pipe type spillway 10 is simply installed in a form perpendicular to the center line and water flow direction of the spillway 10 on the inner peripheral surface of the pipe wall 20. As the water level in the spillway 10 rises, the submerged section of the groove expands, which inevitably causes obstacles to the smooth inflow of air above the water surface through the groove 30. Even if the groove 30 is Even if a small amount of upper air was introduced through the water, there was a problem in that the discharge from the lower pipe wall 20 of the water flow was not smooth.

In particular, the air mixing device for the conventional irrigation canal type spillway (10) has a structure in which the entire section of the groove (30) is completely exposed to the water flow, so the groove (30) inevitably acts as a factor that impedes the progress of the water flow. This was directly related to excessive water head loss and a decrease in the water flow capacity of the spillway 10, so the performance of the spillway 10 was inevitably seriously damaged.

In addition, cavitation may be promoted as the high-speed water current in the spillway 10 continuously rushes to the downstream end of the exposed groove 30, which may lead to instability of the water flow in the spillway 10. Of course, there was a serious problem that resulted in damage to the spillway (10) pipe wall (20).

The present invention was created in consideration of the above-described problems. In the air mixing device for a spillway type spillway, an arc-shaped groove 30 is formed on the inner peripheral surface of the pipe wall 20 of the spillway 10. A ramp 25 is formed on the lower upstream pipe wall 20, which gradually raises the pipe wall 20 from upstream to downstream, and as the water flow passes through the upper surface of the ramp 25, the ramp 25 downstream groove 30 and It is an air mixing device for a pipe type spillway, characterized in that an air chamber (29) is formed where the surface of the pipe wall (20) and the water flow are spaced apart.

In addition, the present invention relates to an air mixing device for a spillway type spillway, in which a groove 30, which is an arc-shaped groove, is formed on the inner peripheral surface of the pipe wall 20 of the spillway 10, and a groove 30, which is an arc-shaped groove, is formed at the upper end of the groove 30 while forming an inclined surface. It is an air mixing device for a waterway-type spillway, characterized in that the guide recess (35) is formed on the upstream side of the spillway (10).

In addition, the present invention relates to an air mixing device for a spillway type spillway, wherein an arc-shaped groove (30) is formed on the inner peripheral surface of the pipe wall (20) of the spillway (10), and both side surfaces of the pipe wall (20) of the spillway (10) are formed. An arc-shaped blocking plate 40 is formed in the groove 30 formed in so that the groove 30 outside the blocking plate 40 is isolated from the water flow inside the spillway 10. am.

Through the present invention, smooth and stable operation of the air mixing device for the spillway type spillway (10) is possible, thereby ensuring the stability of the water flow in the spillway (10) and preventing damage to the pipe wall (20) of the spillway (10). can be prevented, and the durability and performance of the spillway 10 can be improved.

In particular, in the water-type spillway (10) air mixing device of the present invention, air can be stably and smoothly introduced into the groove (30) from the upper air layer of the waterway through the guide recess (35) formed at the top of the groove (30). , By creating an air chamber 29 through the lamp 25 formed on the upstream pipe wall 20 at the bottom of the groove 30, the air supplied through the groove 30 is smoothly discharged to the bottom of the water stream. , may be mixed.

In addition, by isolating the groove 30 formed on the side surface of the pipe wall 20 from the water flow through the blocking plate 40, unnecessary inflow of water into the groove 30 is suppressed to maintain breathability of the groove 30, and at the same time, the groove ( 30) By maintaining the smoothness of the side part of the tube wall 20 at the formation point, it is possible to minimize head loss and suppress cavitation caused by collision of the water flow with the groove 30.

Figure 1 is an explanatory diagram of a irrigation canal type spillway.
Figure 2 is a representative cross-sectional view of a conventional irrigation canal type spillway.
Figure 3 is a perspective view of a conventional irrigation ditch type spillway.
Figure 4 is a representative cross-sectional view of the present invention
Figure 5 is a perspective view of a downstream viewpoint of the present invention
Figure 6 is a perspective view of the upstream viewpoint of the present invention
Figure 7 is a representative cross-sectional view of an embodiment of the present invention to which a blocking plate is applied.
Figure 8 is a perspective view taken from a downstream perspective of the embodiment of Figure 7;
Figure 9 is a perspective view of the upstream viewpoint of the embodiment of Figure 7
Figure 10 is a perspective view of a downstream viewpoint of an embodiment of the present invention to which an adhesive blocking plate is applied.

The detailed structure and operation of the present invention will be described through the attached drawings as follows.

First, Figure 4 shows the cross-section and longitudinal cross-section of the spillway 10 to which the present invention is applied. As shown, the present invention is an air mixing device installed in the irrigation canal type spillway 10, and the spillway ( A groove 30, which is an arc-shaped groove in cross-section, is formed on the inner peripheral surface of the pipe wall 20 of 10, and the upper ends of both sides of the groove 30 are located above the center of the spillway 10.

In addition, Figure 5 is a perspective view of the downstream view of the spillway 10 to which the present invention is applied, with the viewpoint located downstream from the point where the groove 30 of the air entrainment device of the present invention is formed ( 10) It is a partially cut perspective view, and Figure 6 is a perspective view taken from the upstream viewpoint of the spillway 10 to which the present invention is applied, with the viewpoint located upstream from the point where the groove 30 of the air entrainment device of the present invention is formed. This is a partially cut perspective view of the spillway (10).

As can be seen through FIGS. 4 to 6, in the present invention, a ramp 25 is formed on the upstream pipe wall 20 below the groove 30, which gradually raises the pipe wall 20 from upstream to downstream. As its dictionary meaning, the ramp 25 is a guideway with a gentle slope, and has a structure in which the surface of the lower end of the pipe wall 20 gradually rises toward the center of the spillway 10 from upstream to downstream.

In addition, the end point of the ramp 25, that is, the downstream end, is formed at the lower end of the groove 30, and therefore, at the lower end of the groove 30, the pipe wall 20 on the upstream side of the groove 30 is smaller than the pipe wall 20 on the downstream side. The thickness takes on an enlarged form.

Through the formation of this lamp 25, as shown in FIG. 4, the water flow passes through the upper surface of the lamp 25, and an air chamber ( An air chamber (29) is created, which allows the air introduced through the groove (30) to be more smoothly mixed into the boundary between the lower part of the water stream and the pipe wall (20).

In addition, in the present invention, as shown in FIGS. 4 to 6, a guide recess 35 that is recessed while forming an inclined surface at the upper end of the groove 30 is formed on the upstream side of the spillway 10, and the guide recess 35 is formed in the spillway 10. (10) A configuration that forms a guideway so that air can smoothly flow into the groove 30 from the air layer formed on the upper inner side, and the inclined surface inside the guide groove 35 is deeply recessed on the downstream side into the pipe wall 20. It has a structure where the depth gradually decreases towards the upstream side.

That is, as shown in FIG. 6, it is a groove formed in the upstream direction from the top of the groove 30, and the end point of the groove forming the guide recess 35 is connected to the top of the groove 30, and the starting point is is formed at a point spaced upstream from the groove 30, and forms a slope toward the outside of the spillway 10 from the upstream starting point of the guide recess 35 to the downstream end point.

Therefore, as shown in FIG. 4, in the process of transporting the upper air layer by the water flow in the spillway 10, the air being transported from upstream to downstream enters the guide recess 35 and then flows smoothly into the groove 30. Air can be introduced into the groove 30 without a separate artificial pressurization or acceleration means.

Meanwhile, FIGS. 7 to 10 show an embodiment in which a blocking plate 40 is configured to block exposure of the groove 30 in the direction toward the center of the spillway 10 of the groove 30. An arc-shaped blocking plate 40 is formed in the grooves 30 formed on both side surfaces of the pipe wall 20, so that the grooves 30 on the outside of the blocking plate 40 are isolated from the water flow inside the spillway 10. do.

In the blocking plate 40 of the present invention, as shown in FIG. 7, the inner peripheral surface of the blocking plate 40 coincides with the inner peripheral surface of the pipe wall 20, and the lower end of the blocking plate 40 is opened to form the groove 30. The lower part is exposed toward the center of the spillway (10).

That is, the inner diameter of the arc-shaped blocking plate 40 and the inner diameter of the pipe wall 20 of the spillway 10 match, so that, as shown in FIGS. 8 and 9, the pipe wall 20 and the blocking plate at the point where the blocking plate 40 is formed (40) The surface is made smooth, so the frequent collision of the water flow with the groove 30 at the forming point of the groove 30 on the side of the pipe wall 20, resulting in head loss and acceleration of cavitation, can be resolved. There is.

In addition, most of the side section of the groove 30 is isolated from the water flow by the blocking plate 40, thereby fundamentally eliminating air transport problems caused by flooding of the groove 30.

In particular, as shown in FIG. 10, convenience of construction is achieved by pre-fabricating the blocking plate 40 using a separate metal plate and applying the adhesive blocking plate 40 to attach it to the pipe wall 20 of the spillway 10. Not only can it be secured, but it is also possible to apply the blocking plate (40) to the existing spillway (10).

10: Yeosu-ro
20: pipe wall
25: lamp
29: air room
30: groove
35: Judo waist
40: blocking plate

Claims (3)

In the air mixing device of the irrigation canal type spillway,
A groove 30, which is an arc-shaped groove, is formed on the inner peripheral surface of the pipe wall 20 of the spillway 10, which is a pipe whose cross section is completely closed by the pipe wall 20;
At the upper end of the groove 30, a guide recess 35 that is recessed while forming a slope is formed on the upstream side of the spillway 10, and the slope inside the guide recess 35 gradually decreases in depth from the downstream side to the upstream side, leading to the spillway 10. (10) An air mixing device for a conduit-type spillway, characterized in that the upper air layer, which was transported from upstream to downstream by the internal water flow, enters the guide recess (35). delete delete

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