CN112982556A

CN112982556A - Curved bottom fence water taking structure

Info

Publication number: CN112982556A
Application number: CN202110267527.0A
Authority: CN
Inventors: 白瑞迪; 刘善均; 许唯临; 王韦; 王航; 罗晶; 刘雪纯; 郑晓慧
Original assignee: Sichuan University
Current assignee: Sichuan University
Priority date: 2021-03-12
Filing date: 2021-03-12
Publication date: 2021-06-18

Abstract

The invention discloses a curved bottom barrier water taking structure which comprises a water taking gallery arranged on a curved overflow weir body and a curved bottom barrier covering right above the water taking gallery, wherein the opening direction of the water taking gallery is perpendicular to the water flow direction, the outlet of the water taking gallery is communicated with an external water diversion channel, and the barrier surface of the curved bottom barrier is a cambered surface. The water taking device can realize water taking of the curved barrage and solve the problem that a water taking structure is easy to be blocked by floaters and blocking stones, so that water cannot be taken.

Description

Curved bottom fence water taking structure

Technical Field

The invention belongs to the field of water diversion structures in hydraulic and hydroelectric engineering, and particularly relates to a curve type bottom fence water taking structure.

Background

The water intaking structure of many forms is because the volume of washing sand water is not enough, and silt siltation before the floodgate is very serious, causes the diversion difficulty or draws the rivers in silt content very big, and the silt siltation of low reaches channel is serious. In order to be capable of normally drawing water, the diversion dike is often manually dredged and piled up, so that the management and operation cost is very high. The bottom fence water diversion structure has the advantages of wide application in mountainous rivers in the northwest and the south of China, simple structure, convenient construction, large water intake, capability of effectively removing large-particle-size bed load, and the like.

Bottom barrier diversion hub building includes: bottom fence galleries, flood discharge and sand discharge gates, overflow weirs and the like. When river water passes through the diversion gate, part or all of the water flows into the corridor through the barrier gaps and then flows into the channels from one end of the corridor. Except for fine particles entering the gallery along with water flow, the bed load in the river is discharged to the downstream along with water flow from the top of the barrier, and fine sand entering the gallery is discharged to the original river channel from a funnel sand discharge or a sand settling pond arranged on the main channel. The bottom fence has the advantages of simple water taking arrangement, convenient construction and lower manufacturing cost, and is suitable for projects with larger river flow and more large-particle-size silt.

At present, a commonly used bottom barrier water taking structure is characterized in that a metal barrier of the bottom barrier is linear, so that water cannot be taken from a curved weir. After the linear bottom barrier is built and operated, part of floating objects and gravels with the grain sizes close to the gap spacing can be blocked on the gap surface, so that the blockage is caused. Because the bottom barrier is parallel to the ground, the blockage is not easy to be taken away by the downward-leaking water flow, the area of the barrier gap is often blocked by 30-70%, the overflowing area of the water taking structure of the bottom barrier is greatly reduced, and the water taking amount is greatly reduced.

Disclosure of Invention

The invention aims to provide a curved bottom fence water taking structure aiming at the defects of the prior art so as to realize water taking of a curved weir dam and solve the problem that the water taking structure is easy to be blocked by floaters and blocking stones, so that water cannot be taken.

The invention provides a curved bottom barrier water taking structure which comprises a water taking gallery and a curved bottom barrier, wherein the water taking gallery is arranged on a curved overflow weir body, the curved bottom barrier covers the water taking gallery, the opening direction of the water taking gallery is perpendicular to the water flow direction, the outlet of the water taking gallery is communicated with an external water diversion channel, and the barrier surface of the curved bottom barrier is an arc surface.

Furthermore, the shape of the curved bottom barrier is matched with the shape of the surface of the weir dam, and the radian of the arc surface meets the requirement of smooth connection with the surface of the weir dam.

Furthermore, the water taking gallery is arranged at the position 0.5-2 meters downstream of the top of the curved weir dam, and the width of the water taking gallery along the water flow direction is 1-2 meters along the weir surface.

Furthermore, the curved bottom barrier is formed by welding a plurality of metal barrier bars in the transverse direction (vertical to the water flow direction) and the longitudinal direction (vertical to the transverse direction).

Further, the distance between the transverse barrier bars of the bottom barrier is not more than 10cm, preferably 5-10 cm.

Further, the water taking gallery penetrates through the weir dam.

Furthermore, a water outlet gate is arranged at the joint of the water taking gallery and an external channel.

The curve bottom barrier water taking structure is arranged on an overflow weir dam according to the requirements of farmland irrigation or domestic water and the like. In practice, the water taking structure of the bottom fence can be designed according to the maximum water taking amount. When the required flow is small, partial sealing cover can be carried out on the bottom fence water taking structure, the flow area is reduced, and the water taking amount is reduced. After the floating objects and the stuck stones are flushed to a downstream river channel, the downstream blockage can not be caused under the general condition. Small floating objects and stuck stones can be not processed; and (4) properly dredging large floating objects and stuck stones.

1. The invention provides a curved bottom fence water taking structure suitable for a curved weir. Because the bottom barrier is curved, the bottom barrier is arranged at the downstream of the weir crest of the curved weir dam and has certain slope towards the downstream, water flow is acted by centrifugal force, so that the water flow pressure on the bottom barrier is reduced, namely, the water pressure borne by sand, and the like is also reduced, when the sand, the like falls on the bottom barrier surface, the friction force borne by the sand, the like, is easier to flow towards the downstream under the action of the curve and the water flow, the possibility that sundries such as sand, and the like are accumulated on the bottom barrier surface is reduced, the floating objects and stuck stones blocked on the bottom barrier are better cleared, and the blocked impurities are easier to flush towards the downstream.

2. The curved bottom barrier water taking structure has larger interface area between the curved bottom barrier and water flow, and can improve water taking amount to a certain extent.

3. The curved bottom barrier water taking structure has the advantages of simple structure, convenience in construction and less engineering amount, can meet the curved weir shape, can reduce impurities clamped on the barriers, can better filter upstream incoming flow to take water, reduces the management and maintenance cost of the bottom barrier structure, and realizes wider application of the bottom barriers. Meanwhile, the requirements of taking water flow in a dry season and timely draining flood peaks in flood can be met, and the method has more obvious advantages compared with the bottom fence in a general form.

Drawings

FIG. 1 is a top view (plan view) of a bottom railing (and a conventional linear water intake structure) water intake structure in this embodiment 1;

FIG. 2 is a side view (floor plan) of a prior art linear bottom barrier water intake structure;

fig. 3 is a side view (floor plan) of the curved bottom barrier water intake structure of the present invention.

In the figure, 1-water taking gallery; 2-bottom barrier; 3-bottom fence section; 4, an overflow weir segment; 5, flood discharge and sand sluice; 6-water outlet gate, 7-channel.

Detailed Description

The invention is further illustrated by the following examples. It should be noted that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention, and those skilled in the art can make certain insubstantial modifications and adaptations of the present invention based on the above disclosure and still fall within the scope of the present invention.

Example 1

This embodiment curved end barrier structure of fetching water sets up on the weir of the curved overflow weir dam of river course (the cross section of weir is the curvilinear figure), and this river course dam body divide into end barrier section 3 and overflow weir section 4, and the overflow weir section is provided with flood discharge sluicing floodgate 5. The curved bottom barrier water taking structure is arranged on the bottom barrier section and comprises a water taking gallery 1 arranged on the weir body and a curved bottom barrier 2 covering the water taking gallery, wherein the water taking gallery is located at 1 meter of the downstream of the weir top of the curved weir dam, the water taking gallery is a groove which is formed in a way that the water taking gallery is perpendicular to the water flow direction and transversely (perpendicular to the water flow direction) penetrates through the weir top of the bottom barrier section, and the width of the water taking gallery along the water flow direction is 2 meters along the weir surface. The outlet of the water taking gallery is communicated with the external water diversion channel 6 to guide water flow to an irrigation area, and a water outlet gate is arranged at the joint of the water taking gallery and the external channel. The barrier surface of the curved bottom barrier is a cambered surface, the shape of the curved bottom barrier is matched with the shape of the surface of the weir, and the radian of the cambered surface meets the requirement of smooth connection with the surface of the weir. The curved bottom barrier is formed by welding a plurality of metal barrier bars in the transverse direction (vertical to the water flow direction) and the longitudinal direction (vertical to the transverse direction). The distance between the transverse barrier bars of the bottom barrier is 8 cm.

The curved bottom fence water taking structure is designed according to the maximum water taking amount. When the required flow is small, partial sealing cover can be carried out on the bottom fence water taking structure, the flow area is reduced, and the water taking amount is reduced. After the floating objects and the stuck stones are flushed to a downstream river channel, the downstream blockage can not be caused under the general condition. Small floating objects and stuck stones can be not processed; and (4) properly dredging large floating objects and stuck stones.

Claims

1. a curved bottom fence water intake structure, is characterized in that, comprises the water intake corridor that is arranged on the curved overflow weir body and covers the curved bottom fence directly above the water intake corridor, the water intake corridor The opening direction is perpendicular to the water flow direction, the outlet of the water intake gallery is connected with the external water diversion channel, and the fence surface of the curved bottom fence is an arc surface.

2 . The water intake structure according to claim 1 , wherein the shape of the curved bottom fence matches the shape of the surface of the weir, and the camber of the camber satisfies the smooth connection with the surface of the weir. 3 .

3 . The water intake structure according to claim 1 , wherein the water intake gallery is arranged at 0.5-2 meters downstream of the top of the curved weir. 4 .

4 . The water intake structure according to claim 1 , wherein the width of the water intake gallery along the water flow direction is 1-2 meters along the course of the weir surface. 5 .

5 . The water intake structure according to claim 1 , wherein the curved bottom fence is formed by welding several horizontal and vertical metal fence bars. 6 .

6 . The water intake structure according to claim 1 , wherein the spacing between the horizontal fence bars of the bottom fence is not more than 10 cm. 7 .

7 . The water intake structure according to claim 6 , wherein the spacing between the horizontal fence bars of the bottom fence is 5-10 cm. 8 .

8 . The water intake structure according to claim 1 , wherein the water intake gallery passes through the weir where it is located. 9 .

9 . The water intake structure according to claim 1 , wherein an outlet gate is provided at the connection between the water intake gallery and the external channel. 10 .