CN216586445U

CN216586445U - Double-layer energy dissipation and sand collection channel

Info

Publication number: CN216586445U
Application number: CN202122671913.4U
Authority: CN
Inventors: 朱晓明; 刘丹丹; 龚鸣; 吴振超; 吴振宇; 吴双; 郭津良; 乔娟; 张立仁; 曾娟
Original assignee: College Of Science And Technology Of China Three Gorges University
Current assignee: College Of Science And Technology Of China Three Gorges University
Priority date: 2021-11-03
Filing date: 2021-11-03
Publication date: 2022-05-24
Anticipated expiration: 2031-11-03

Abstract

The double-layer energy dissipation and sand collection channel comprises a flow channel, one end of the flow channel is communicated with a sand sedimentation tank, the sectional area of the sand sedimentation tank is larger than that of the flow channel, a partition plate, a descending plate, a pore plate and a flip bucket are sequentially arranged in the flow channel, one end, connected with the pore plate, of the descending plate inclines downwards, and the other end of the flow channel is connected with a sand guide bucket and a sand blocking bucket. The utility model collects the silt in the river channel in a centralized way through energy dissipation measures, so as to purify the water body, reduce the harm to the environment caused by the silt problem and improve the efficiency of the hydro-junction.

Description

Double-layer energy dissipation and sand collection channel

Technical Field

The utility model belongs to the technical field of novel energy dissipation and sand collection in hydraulic and hydroelectric engineering, and particularly relates to a novel energy dissipation and sand collection device which is suitable for the front of large and medium-sized hydraulic engineering, the middle upstream of a sandy river and the downstream of a river in a mountain torrent and flood outburst area, and can be widely used for various sand and stone sinking and large-particle-size suspended water body purification occasions.

Background

At present, how to correctly and efficiently treat river silt so as to purify a water body and reduce various hazards brought by the silt is a difficult and crucial problem in hydraulic engineering. The process discovery of sediment depositing at different positions along with the change of the flow velocity of water is researched, and the problem that sediment is complex and difficult to clean is caused because the water body is complex in overflowing condition and can not be uniformly deposited at one place. Simultaneously because silt particle size is little, tradition trash holding structure can't be blocked it to in it can get into hydraulic engineering facility, and lead to hydraulic engineering equipment's wearing and tearing problem.

Correctly knowing the types and cause mechanisms of sand and stone hazards and correspondingly processing the hazards, has great significance for maintaining regional economic development and improving the living standard of people. Therefore, the silt is collected accurately and efficiently, and the water body purification is very important.

To sum up, the double-layer energy dissipation and sand collection channel is provided, and the problem of river sediment can be effectively solved.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a double-layer energy dissipation and sand collection channel aiming at the current river sediment problem, and intensively collect the sediment in a river channel through energy dissipation measures, so as to purify a water body, reduce the harm to the environment caused by the sediment problem and improve the efficiency of a hydro junction.

In order to solve the problems, the technical scheme of the utility model is as follows: the double-layer energy dissipation and sand collection channel comprises a flow channel, wherein one end of the flow channel is communicated with a sand basin, the sectional area of the sand basin is larger than that of the flow channel, a partition plate, a descending plate, a pore plate and a flip bucket are sequentially arranged in the flow channel, one end of the descending plate, which is connected with the pore plate, is inclined downwards, and the other end of the flow channel is connected with a sand guide bucket and a sand blocking bucket. The rivers that contain silt in the river course get into the runner, it passes through from baffle top and baffle below respectively to get into the runner rivers, baffle top rivers are the non-pressure rivers, baffle below rivers are for having a pressure rivers, have a pressure rivers and cross from the orifice plate outflow with the non-pressure rivers with higher speed after falling the board, realize the first energy dissipation of rivers, then cross rivers become the turbulent flow through the flip bank after, accomplish the second energy dissipation of rivers, after the last rivers get into the energy dissipation of desilting pond third time, silt is depositd in the desilting pond in the rivers.

The utility model has the beneficial effects that:

1. the design is a sediment trapping sill before the channel inlet, so that most of sand and stones in the river are accumulated at the sediment trapping sill and then enter the double-layer energy dissipation and sand collection channel along the water flow at the sediment trapping sill, and the problem that the sediment is difficult to collect in the existing engineering is effectively solved.

2. The baffle plate is provided with a double-layer structure with a certain length in the flow channel, and the water body can dissipate energy for the first time by the inrush current generated at the orifice plate through the flow speed difference. Experiments show that the energy dissipation efficiency of the inrush current energy dissipation is 35-45%.

3. After water flow passes through the partition plate with the holes, multiple hydraulic jumps and hydraulic drops are generated at the flip bucket, so that the water body is changed from laminar flow to turbulent flow, and secondary energy dissipation is performed. The experiment shows that the energy dissipation efficiency of trajectory jet energy dissipation is between 15% and 20%.

4. By integrating two-time energy dissipation, the energy dissipation efficiency of the utility model is between 50% and 65%. After many times of energy dissipation, the velocity of flow of rivers slows down for silt deposits in the middle of the desilting pond that has established in advance, thereby reaches the centralized processing silt, purifies the water, protects hydraulic engineering equipment's the effect of safe operation.

Drawings

The utility model is further described below with reference to the accompanying drawings:

figure 1 is a schematic perspective view of the present invention,

FIG. 2 is a schematic cross-sectional view of the present invention,

fig. 3 is a schematic perspective view of a sand barrier sill according to the present invention.

In the figure: the sand blocking bottom sill 1, the sand guiding sill 2, the flow channel 3, the partition plate 4, the falling plate 5, the pore plate 6, the flip sill 7, the sand collecting tank 8, the sand flushing pipe 9, the gate 10 and the sand settling tank 11.

Detailed Description

As shown in fig. 1 to 3, the double-layer energy dissipation and sand collection channel comprises a flow channel 3, wherein the flow channel 3 is lower than or flush with an original river channel, one end of the flow channel 3 is communicated with a sand settling tank 11, the sectional area of the sand settling tank 11 is larger than that of the flow channel 3, a partition plate 4, a falling plate 5, a pore plate 6 and a wavy flip bucket 7 are sequentially arranged in the flow channel 3, one end of the falling plate 5, which is connected with the pore plate 6, is inclined downwards, the other end of the flow channel 3 is connected with a sand guide bucket 2 and a sand guide sill 1, and the sand settling tank is communicated with a sand collection tank 8 through a plurality of sand flushing pipes 9.

This double-deck energy dissipation collection sand channel is suitable for the river course of multiple topography condition, if the river course has natural bend condition, then excavates the sluicing floodgate in river course revetment department, utilizes the flow state principle of relief and rivers, introduces this double-deck energy dissipation collection sand channel with most silt, if do not have natural bend or favourable topography, then build the water that leads husky bank 2 and block husky sill 1 and smoothly will contain a large amount of silt and introduce double-deck energy dissipation collection sand channel.

The rivers that contain a large amount of silt in the river course pass through the guide of bank 1 at the bottom of blocking sand, rivers get into runner 3, it passes through from 4 tops of baffle and 4 below of baffle respectively to get into 3 rivers of runner, 4 tops of baffle rivers are non-pressure rivers, 4 below rivers of baffle are pressure rivers, the non-pressure rivers velocity of flow is relatively more slow, pressure rivers are the smooth-going 4 below runners of baffle of inflow at first, after 5 through falling the board, rivers cross water section area and reduce, learn by the continuity equation Q = AV of rivers, when crossing water section area and reducing, when the flow is unchangeable, the velocity of flow accelerates. Therefore, a current can be formed after the pressurized water current gushes out from each hole on the pore plate 6, and impact is caused to the upper layer non-pressurized water current, so that the energy of the upper layer water current is weakened, and the first energy dissipation is realized.

The water flow after the first energy dissipation passes through the flip bucket 7, and when the water flow flows over the flip bucket 7, the water flow jumps and falls for multiple times, so that the water flow achieves the second energy dissipation, and the water flow after the second energy dissipation enters the desilting basin 11, and the sectional area of the desilting basin 11 is larger than that of the runner 3, so that the third energy dissipation can be performed on the water flow, and meanwhile, silt is precipitated in the desilting basin 11.

When the sediment in the sand basin 11 is accumulated to a certain amount, the gate 10 on the sand washing pipe can be opened, the sediment can be washed into the sand collecting basin 8 through the sand washing pipe 9 by water flow, and the collected sediment can be used in various engineering industries, so that the requirement for manual sand digging is reduced. The workload of manual sand digging is reduced, and the effects of purifying water and recycling resources are achieved.

The included angle between the falling plate 5 and the horizontal plane is 45-60 degrees. Because the phenomenon of energy dissipation by inrush current needs to be generated, the flow velocity of the lower layer of water flow is necessarily larger than that of the upper layer of water flow, so that the lower layer of water flow velocity can be better ensured to be larger than that of the upper layer of water flow at 45-60 degrees, and large head loss is not generated. Meanwhile, the water flow is smoother when the angle is 45-60 degrees, and the scouring to the channel can be reduced.

As shown in fig. 3, the cross section of the sand-blocking sill 1 is narrow at the top and wide at the bottom, and the longitudinal overall layout is in arc-bearing distribution, and the angle of the oblique or curved arrangement on the plane is related to the arrangement position of the water inlet, and should be determined by combining with the analysis of the actual conditions of the project.

The height of the sand guide ridge 2 follows the formula H = D410 theta^1.5(wherein H is the net height of the sand guide ridge 2, and D is the grain size represented by silt). The smooth river channel guiding device is beneficial to smoothly guiding water flow containing a large amount of silt into the river channel, and meanwhile, the sand guide ridge 2 with the cross section being narrow at the top and wide at the bottom is beneficial to construction convenience and can improve the stability in use.

Claims

1. Double-deck energy dissipation collection sand channel, its characterized in that: the flow channel comprises a flow channel (3), one end of the flow channel (3) is communicated with a sand settling tank (11), the sectional area of the sand settling tank (11) is larger than that of the flow channel (3), a partition plate (4), a descending plate (5), a pore plate (6) and a flip bucket (7) are sequentially arranged in the flow channel (3), and the descending plate (5) is connected with one end of the pore plate (6) to be inclined downwards.

2. The double-layer energy-dissipating sand-collecting channel of claim 1, wherein: the other end of the flow passage (3) is connected with a sand guide sill (2) and a sand blocking sill (1).

3. The double-layer energy-dissipating sand-collecting channel of claim 2, wherein: the cross section of the sand blocking sill (1) is of a trapezoidal structure with a narrow top and a wide bottom.

4. A double layer energy dissipating sand collecting channel as claimed in any one of claims 1 to 3 wherein: the included angle between the falling plate (5) and the horizontal plane is 45-60 degrees.

5. A double layer energy dissipating sand collecting channel as claimed in any one of claims 1 to 3 wherein: the flip bucket (7) is wave-shaped.

6. A double layer energy dissipating sand collecting channel as claimed in any one of claims 1 to 3 wherein: the sand settling tank (11) is communicated with the sand collecting tank (8) through a plurality of sand flushing pipes (9), and a gate (10) is arranged on each sand flushing pipe (9).