CN211690185U - Flood discharge structure for dam body of high dam - Google Patents

Abstract

The utility model discloses a flood discharge structure especially discloses a high dam body flood discharge structure, belongs to hydraulic structure design and construction technical field. The flood discharge structure of the dam body of the high dam can be used for reducing the water tongue without increasing the depth of a flushing pit. The high dam body flood discharge structure comprises a high dam body provided with a flood discharge passage, and further comprises a flow channel lateral water collecting and energy dissipating output system, wherein the flow channel lateral water collecting and energy dissipating output system is arranged on two side walls, close to a bottom plate, of the flood discharge passage along the water delivery direction of downward-discharged water flow.

Description

Flood discharge structure for dam body of high dam

Technical Field

The utility model relates to a flood discharge structure especially relates to a high dam body flood discharge structure, belongs to hydraulic structure design and construction technical field.

Background

The flood discharge building is a vital structure of a dam, particularly a high dam and a large reservoir, occupies a very important position, and is a key technology of the hydropower industry for ensuring the flood discharge safety of the dam and saving the engineering investment. Particularly, in western high mountain canyon regions, the method is usually suitable for building a dam with a larger height, but the narrow river channel has some adverse effects on the flood discharge safety of the dam, and brings great technical difficulty for the flood discharge scheme selection of the dam and the building arrangement. The trajectory energy dissipation is a scheme of utilizing a flip bucket arranged at the tail end of a flood discharge channel to shoot a downward discharge flow to a downstream river channel far away from a dam and utilizing a downstream natural river channel to flush a pit water cushion or a manual pre-digging pit water cushion for energy dissipation, and is more and more widely applied to hydropower station projects of medium and high dams as a common energy dissipation mode which can save engineering investment and guarantee flood discharge safety of the dam. Under the condition that a downstream river channel of a dam is narrow and side slopes are high and steep, in order to avoid the influence of the drift lingua to wash the pits on the side slopes on two sides of the downstream as much as possible, the lingua needs to be narrowed, if a scheme of reducing the width of a hole and increasing the single-wide flow is adopted, the depth of the downstream to wash the pits is increased, and the dam foundation or the side slopes of the river channel on two sides can be adversely affected by the over-deep washing pits due to the expansion towards the periphery.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve is: the flood discharge structure of the dam body of the high dam can be used for reducing the water tongue without increasing the depth of a flushing pit.

The technical scheme adopted for solving the technical problems is as follows: the utility model provides a high dam body flood discharge structure, is including the high dam body that is provided with the spillway, dam body flood discharge structure still include runner side direction energy dissipation output system that receives water, runner side direction energy dissipation output system that receives water arrange on two lateral walls that the spillway closes on the bottom plate along the water delivery direction of rivers that let down.

Furthermore, a flip bucket is arranged on the inner side of the output tail end of the spillway.

In a preferred mode of the above scheme, the projection of the spillway in the lower drainage flow conveying horizontal plane is in a splayed shape with a large upper part and a small lower part.

Furthermore, the runner lateral water-collecting energy-dissipating output system comprises two water-collecting output channels, and the two water-collecting output channels are correspondingly arranged on two side walls of the spillway, which are close to the bottom plate, respectively.

The preferable mode of the above scheme is that each water receiving output channel is in a groove shape with a small upper part and a large lower part, a shallow upper part and a deep lower part on the corresponding side wall along the water conveying direction of the downward drainage water flow, and the tail end of the groove-shaped water receiving output channel is provided with a water receiving bulge.

Further, each groove-shaped water receiving and outputting channel is in a side-placed tobacco pipe shape in the three-dimensional shape on the corresponding side wall.

The preferable mode of the scheme is that the projection of the spillway on the side wall is in a soup ladle shape with a hook head.

The utility model has the advantages that: this application sets up runner side direction receipts water energy dissipation output system through increasing on the basis of the current high dam body that has set up the spillway, and will runner side direction receipts water energy dissipation output system arrange on two lateral walls that the spillway closes on the bottom plate along the water delivery direction of rivers that discharge down, then at the sluicing in-process, make the high-speed rivers of discharging down through the spillway be in runner side direction receipts water energy dissipation output system's cooperation draws in to the flow center down, and make the output rivers that draw in through runner side direction receipts water energy dissipation output system and the rivers of discharging down of other part outputs of this spillway collide the energy dissipation in the air to the low reaches that have avoided the rivers of discharging down because of carrying a large amount of potential energy and cause dash the hole deepening and the problem of expansion. And then the technical problem of narrowing of high-speed downward-discharging water flow is solved, and the technical problem that the depth of a downstream flushing pit is increased and too deep due to the narrowing of the water flow in the prior art is solved, so that the peripheral expansion of the flushing pit can bring adverse effects to a dam foundation or river slopes on two banks.

Drawings

Fig. 1 is a front view of the flood discharge structure of the dam body of the high dam of the present invention;

fig. 2 is a sectional view a-a of fig. 1.

Labeled as: flood discharge way 1, high dam body 2, bottom plate 3, lateral wall 4, flip bucket 5, receive water output channel 6, receive water arch 7.

Detailed Description

As shown in fig. 1 and 2, the present invention provides a flood discharging structure for high dam body without increasing the depth of the flushing pit on the premise of narrowing the water tongue. The high dam body flood discharge structure comprises a high dam body 2 provided with a flood discharge passage 1, and further comprises a flow passage lateral water collecting and energy dissipating output system, wherein the flow passage lateral water collecting and energy dissipating output system is arranged on two side walls 4, close to a bottom plate 3, of the flood discharge passage 1 along the water delivery direction of downward-discharged water flow. This application sets up runner side direction receipts water energy dissipation output system through increasing on the basis of the current high dam body that has set up the spillway, and will runner side direction receipts water energy dissipation output system arrange on two lateral walls that the spillway closes on the bottom plate along the water delivery direction of rivers that discharge down, then at the sluicing in-process, make the high-speed rivers of discharging down through the spillway be in runner side direction receipts water energy dissipation output system's cooperation draws in to the flow center down, and make the output rivers that draw in through runner side direction receipts water energy dissipation output system and the rivers of discharging down of other part outputs of this spillway collide the energy dissipation in the air to the low reaches that have avoided the rivers of discharging down because of carrying a large amount of potential energy and cause dash the hole deepening and the problem of expansion. And then the technical problem of narrowing of high-speed downward-discharging water flow is solved, and the technical problem that the depth of a downstream flushing pit is increased and too deep due to the narrowing of the water flow in the prior art is solved, so that the peripheral expansion of the flushing pit can bring adverse effects to a dam foundation or river slopes on two banks.

In the above-mentioned embodiment, in order to make things convenient for the main rivers of letting down to can choose higher to rivers after the constriction collide the energy dissipation in the place of keeping away from the building, this application still is provided with flip bucket 5 in the inboard of spillway 1 output end. The flip bucket 5 which is tilted upwards can make the water flow leaking at the lower speed raise upwards when flowing out of the leakage flood way, and send the water flow to be relatively higher and farther, and the water flow which is gathered from two sides and laterally picked out effectively collides to eliminate a large amount of potential energy. Because the narrowing structure is arranged, namely the runner lateral water-collecting energy-dissipating output system, the projection of the flood discharge passage 1 in the lower drainage flow conveying horizontal plane is in a splayed shape with a large upper part and a small lower part; then the projection of the spillway 1 on the side wall 4 is in a soup ladle shape with a hook head.

Specifically, in order to realize the functions of narrowing the water flow and raising the narrowed water flow from the lateral direction, the flow passage lateral water-collecting energy-dissipating output system with the following structure is provided. Firstly, the most basic requirement is that the flow channel lateral water-collecting energy-dissipating output system comprises two water-collecting output channels 6, and the two water-collecting output channels 6 are respectively and correspondingly arranged on the two side walls 4 of the flood discharge channel 1 close to the bottom plate 3. At this time, if the water collecting output channel 6 is only from the angle of convenient construction, the structure can be just a water guide collecting groove with a groove. Certainly, the lateral water-picking effect of the structure is not good, for this reason, each water-receiving output channel 6 of the present application is in a groove shape with a small upper part and a large lower part, and a shallow upper part and a deep lower part along the downward-draining water flow direction at the corresponding side wall 4, and a water-receiving bulge 7 is arranged at the tail end of the groove-shaped water-receiving output channel. In a more detailed structure, each groove-shaped water receiving and outputting channel is in a side-placed tobacco pipe shape in a three-dimensional shape on the corresponding side wall.

In conclusion, the flood discharge structure of the dam body of the high dam provided by the application has the following advantages,

the curved-surface-side water guide walls are arranged on the two sides of the flow channel, the water tongues on the two sides of the flow channel are thrown in an arc shape above the main water tongue, and the thrown water tongues fall and collide with the main water tongue in the air in the process of falling and overshoot, so that collision energy dissipation can be effectively carried out, the problem that the depth of a downstream pit is increased due to narrowing of the water tongues is solved, and the energy of the main water tongues is dissipated due to collision of the water tongues in the air is solved, so that the pit of the downstream pit is reduced, and the range and the depth of the downstream pit can be effectively reduced. And the engineering investment is saved on the premise of ensuring the trajectory jet energy dissipation safety.

Claims (7)

1. The utility model provides a high dam body flood discharge structure, is including high dam body (2) that are provided with spillway (1), its characterized in that: the dam body flood discharge structure further comprises a flow channel lateral water collecting and energy dissipating output system, and the flow channel lateral water collecting and energy dissipating output system is arranged on two side walls (4) of the flood discharge channel (1) close to the bottom plate (3) along the water delivery direction of downward discharge water flow.

2. The high dam body flood discharge structure of claim 1, wherein: a flip bucket (5) is arranged on the inner side of the output end of the spillway (1).

3. The high dam body flood discharge structure of claim 2, wherein: the projection of the flood discharge passage (1) in the lower drainage flow horizontal plane is in a splayed shape with a large upper part and a small lower part.

4. The high dam body flood discharge structure according to any one of claims 1 to 3, wherein: the runner lateral water-collecting energy-dissipating output system comprises two water-collecting output channels (6), wherein the two water-collecting output channels (6) are correspondingly arranged on two side walls (4) of the flood discharge channel (1) close to the bottom plate (3) respectively.

5. The high dam body flood discharge structure of claim 4, wherein: each water receiving output channel (6) is in a groove shape with a small upper part and a big lower part, a shallow upper part and a deep lower part on the corresponding side wall (4) along the water delivery direction of the downward drainage flow, and a water receiving bulge (7) is arranged at the tail end of the groove-shaped water receiving output channel.

6. The high dam body flood discharge structure of claim 5, wherein: the three-dimensional shape of each groove-shaped water receiving and outputting channel on the corresponding side wall is a side-placing tobacco pipe shape.

7. The high dam body flood discharge structure of claim 4, wherein: the projection of the flood discharge passage (1) on the side wall (4) is in a soup ladle shape with a hook head.

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