CN216130077U

CN216130077U - Combined type flow-picking energy dissipation device suitable for narrow riverbed

Info

Publication number: CN216130077U
Application number: CN202120918142.1U
Authority: CN
Inventors: 康军红; 郝志鹏; 李钊; 韩李明; 高帅; 韩雪
Original assignee: Hebei Research Institute of Investigation and Design of Water Conservancy and Hydropower
Current assignee: Hebei Institute of Investigation and Design of Water Conservancy and Hydropower Group Co Ltd
Priority date: 2021-04-29
Filing date: 2021-04-29
Publication date: 2022-03-25
Anticipated expiration: 2031-04-29

Abstract

The utility model relates to the field of water conservancy and hydropower, in particular to a combined trajectory energy dissipation device suitable for a narrow riverbed. Comprises a twisted flip bucket, a damming dam and a plunge pool thereof; the twisted deflecting bucket is arranged at the tail end of the reservoir outlet structure and is positioned between the side slopes of the downstream riverways at the two sides, namely, the side walls and the bottom plate of the deflecting bucket at the tail end of the reservoir outlet structure are additionally provided with curved surface corners to form a twisted surface, so that the aim of smoothly connecting the lower outlet flow with the downstream riverways is fulfilled; the water retaining dam is a water retaining structure which is arranged at a certain distance downstream of a reservoir water outlet structure and is used for retaining the water level of a downstream riverbed, and the thickness of a water cushion at the water inlet position of the water-lifting tongue can be increased, so that the pit flushing depth is reduced; the plunge pool is a reservoir with a certain water depth and water area between a reservoir outlet structure and a damming dam; and a punching pit with a certain depth is arranged at the center of the plunge pool and right opposite to the twisted flip bucket.

Description

Combined type flow-picking energy dissipation device suitable for narrow riverbed

Technical Field

The utility model relates to the field of water conservancy and hydropower, in particular to a combined trajectory energy dissipation device suitable for a narrow riverbed.

Background

The reservoir hub is a complex composed of water retaining, water conveying and discharging structures, and the spillway, flood discharging tunnel and the like form the reservoir discharging structure, which is the key for ensuring the flood discharging safety of the reservoir and the flood fighting safety of the dam. Because of the huge energy carried by the discharged water flow, in order to ensure the anti-scouring safety of the hub and the downstream river channel during the flood discharge of the reservoir, energy dissipators are required to be arranged at the downstream of the water discharge structure to dissipate the energy of the discharged water flow.

The reservoir outlet structure energy dissipater mainly comprises bottom flow, trajectory flow, surface flow and the like, wherein trajectory flow energy dissipation is the most common energy dissipation type with wide application at present. The trajectory bucket energy dissipation means that a trajectory bucket is arranged at the tail end of a water discharge structure, the water flow is selected into the air by using the huge kinetic energy of the discharged water flow, and then the water flow falls to the downstream far away from the structure to dissipate energy. At present, the common type of the trajectory bucket is a continuous type, the direction of the trajectory bucket is not changed by the continuous type bucket, the drop point of the trajectory bucket is positioned right ahead of the outlet of a flood discharge building, and if the terrain of a downstream river channel is narrow or curved, the trajectory bucket usually deviates from the main stream and impacts the bank slope of the downstream river channel, so that the downstream river channel bank slope is scoured and damaged, the stability of the bank slope of the river channel is influenced, and the stability and safety of rock masses at two banks at the downstream of a dam are also influenced. In addition, for narrow riverbeds, the drift energy dissipation should reduce the pit flushing depth as much as possible, reduce the pit flushing range and avoid the adverse effect of pit flushing on the stability of the bank slopes on two sides.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a combined trajectory energy dissipater suitable for a narrow riverbed so as to solve the problems in the background technology.

In order to achieve the purpose, the utility model provides the following technical scheme:

a combined trajectory energy dissipation structure suitable for narrow riverbeds comprises a twisted trajectory bucket, a damming dam and a plunge pool thereof;

the twisted deflecting bucket is arranged at the tail end of the reservoir outlet structure and is positioned between the two side slopes of the river channel at the lower reaches, namely, curved surface attaching angles are added on the side walls and the bottom plate of the deflecting bucket at the tail end of the reservoir outlet structure to form a twisted curved surface; the water retaining dam is a water retaining structure which is arranged at a certain distance downstream of the reservoir water outlet structure and is used for retaining the water level of a downstream riverbed; the plunge pool is a reservoir with a certain water depth and water area between a reservoir outlet structure and a water damming dam; and a punching pit with a certain depth is arranged at the center of the plunge pool and right opposite to the twisted flip bucket.

Furthermore, the damming dam adopts a low weir overflow dam, and the elevation of the dam top meets the requirements of the thickness of a water cushion and the area of a water area.

Compared with the prior art, the utility model has the beneficial effects that:

the system can be generally used for trajectory planning energy dissipaters in regions with narrow riverbeds, and is particularly suitable for trajectory planning energy dissipaters in regions with narrow riverbeds and river turning. The twisted flip bucket can enable the high-speed water flow to turn sharply, and the water tongue is pulled longitudinally to control the turning angle and the water inlet point of the flip bucket, so that the aim of smoothly connecting the downward-discharging water flow with the downstream river channel is fulfilled; meanwhile, the arrangement of the damming dam can increase the thickness of a water cushion at the water inlet position of the water-deflecting tongue, so that the depth of a flushing pit is reduced. The combined application of the measures of the flip bucket and the water dam can reduce the scouring of the downward drainage water flow to the bank slopes on the two sides to the maximum extent and reduce the adverse effect of the scouring pit on the stability of the bank slopes on the two sides.

Drawings

FIG. 1 is a plan view of the combined trajectory energy dissipation structure of the present invention;

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

The labels in the figure are: 1. a reservoir outlet structure; 2. a drainage channel; 3. a twisted flip bucket; 4. a downstream river side slope; 5. a water dam; 6. a plunge pool; 61. punching a pit; 7. a downstream waterway.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-2, in an embodiment of the present invention, a combined trajectory energy dissipation structure for a narrow river bed includes a twisted trajectory bucket 3, a damming dam 5 and a plunge pool formed by the same;

the twisted flip bucket 3 is arranged at the tail end of the reservoir outlet building 1 and is positioned between the downstream river slopes 4 at two sides, namely, curved surface attaching angles are added on the side walls and the bottom plate of the flip bucket at the tail end of the reservoir outlet building to form twisted surfaces, and the twisted angles and the twisted surface types enable downward discharge water flow in the discharge channel 2 to be smoothly connected with the downstream river 7; the twisted flip bucket can enable the high-speed water flow to turn sharply, and the water tongue is pulled longitudinally to control the turning angle and the water inlet point of the flip bucket, so that the aim of smoothly connecting the downward-discharging water flow with the downstream river channel is fulfilled;

the water damming dam 5 is a water retaining structure which is arranged at a certain distance downstream of a reservoir water outlet structure and is used for damming up the water level of a downstream riverbed, and is generally an open type low weir overflow dam; the dam is a low weir overflow dam generally, and the dam crest elevation meets the requirements of the thickness of the water cushion and the area of the water area;

the plunge pool 6 is a reservoir with a certain water depth and water area formed between the reservoir outlet structure 1 and the check dam 5 and is used for reducing the scouring depth of a falling water tongue on the foundation and two banks; a punching pit 61 with a certain depth is arranged at the center of the plunge pool and right opposite to the twisted flip bucket.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the utility model can be made, and equivalents and modifications of some features of the utility model can be made without departing from the spirit and scope of the utility model.

Claims

1. The utility model provides a combined type trajectory energy dissipation structure suitable for narrow riverbed which characterized in that: comprises a twisted flip bucket, a damming dam and a plunge pool thereof;

2. The combined trajectory energy dissipation structure for a narrow river bed as claimed in claim 1, wherein: the low weir overflow dam is adopted in the damming dam, and the elevation of the dam top meets the requirements of the thickness of a water cushion and the area of a water area.