CN105369781B - Ways to Increase Water Diversion Flow at Yonggao Water Level - Google Patents

Abstract

The invention relates to a method for backing up a water level and enlarging a water diversion flow. The method is characterized in that an L-shaped movable baffle plate (3) is provided in the method; the lower end of the L-shaped movable baffle plate (3) is fixedly provided with a shaft sleeve (4); a vertical shaft (5) is matched with the shaft sleeve (4); the shaft sleeve (4) can rotate around the vertical shaft (5) and can drive the L-shaped movable baffle plate (3) to rotate along; one end of a dragging cable on a winch (8) is fixed on a vertical water baffle plate (1) of the L-shaped movable baffle plate (3); when the water level of water diversion needs to be raised, the winch (8) on an anchoring point (7) is started; the L-shaped movable baffle plate (3) is dragged to a proper position through the dragging cable (9), so that the water level is backed up; meanwhile, a diversion function is realized through the L-shaped movable baffle plate (3), so that the water diversion flow is enlarged; when water diversion is not performed, the dragging cable (9) is released; and under the effect of a water stream, the L-shaped movable baffle plate (3) is arranged along the water stream, so that the flowing of water is not baffled. By adopting the method, the water level before a gate is improved, and the water diversion flow is increased.

Description

Ways to Increase Water Diversion Flow at Yonggao Water Level

technical field

The invention belongs to the technical field of water conservancy engineering, and relates to a method for increasing water diversion flow with a high water level, which can increase the water diversion water level of water intake structures such as water diversion gates, and increase the water diversion flow. It is especially applicable to the situation where the diversion head decreases due to the incision of the river bed.

Background technique

In recent years, due to the operation plan of the Yellow River for water and sediment regulation, the riverbed of the Yellow River has been eroded and cut down, causing the water level of the Yellow River to drop. However, the bottom elevation of most of the water diversion structures along the Yellow River is designed and built according to the height of the river bottom when there is no downcut. If the water level of the Yellow River drops, the diversion head will decrease, and the water diversion volume will decrease, resulting in the water diversion structures not being able to exert their due benefits. . These water diversion structures are generally the head of water diversion in large irrigation areas. Due to the reduction of water diversion, large areas of farmland cannot be irrigated, and food security is affected. The investment in rebuilding these water intake projects is very large and the cycle is long. Some are not eligible for reconstruction due to the limitation of terrain conditions (mainly controlled by elevation conditions). Mainly adopt large-scale pump boat to draw water at present; But this method invests a lot of money, and operating cost is huge, and has danger. Therefore, under the existing conditions, how to increase the water intake head and increase the diversion flow is an urgent problem to be solved. This invention is carried out in order to solve this problem. The method can also be applied to similar situations beyond the Yellow River.

Contents of the invention

The purpose of the present invention is to provide a method for increasing the flow of diverted water with a high water level. The principle is to convert the kinetic energy of the water into potential energy, that is, the water head H. The calculation formula is: H=ξ·v ² /2/g, where: H is the water head of Yonggao; v is the velocity of incoming water in the river; ξ is the coefficient. The technical scheme for realizing this purpose is as follows: a method for increasing water diversion flow with a high water level, characterized in that: the method is provided with an L-shaped movable baffle formed by a vertical water retaining plate and a horizontal water retaining plate; One end below the baffle is fixed with a shaft sleeve, which is matched with a vertical shaft, and the vertical shaft is fixed on the gate bottom plate on the downstream side of the main canal entrance. The shaft sleeve can rotate around the vertical shaft and drive the L-shaped movable baffle to rotate together; L The horizontal water retaining plate of the type movable baffle is parallel to the river bed, and the horizontal water retaining plate faces the direction of water flow, and the elevation of its upper surface is equal to the elevation of the gate floor; an anchor point is set on the upstream side of the entrance of the main canal, and the winch is fixed on the anchor point. One end of the dragline on the winch is fixed on the vertical water baffle of the L-shaped movable baffle. When it is necessary to increase the diversion water level, start the winch on the anchorage point, pull the L-shaped movable baffle to an appropriate position through the cable, and raise the water level. At the same time, the L-shaped movable baffle acts as a diversion to increase the diversion flow. When not diverting water, relax the cable, and under the action of the water flow, the L-shaped movable baffle is placed along the water flow so as not to block the flow of water. Since the shape of the river channel, the plane layout of the intake gate, the flow rate of incoming water, the width of the channel, the water depth and other factors vary greatly, the length of the horizontal baffle, the height of the vertical baffle, and the entire L-shaped movable baffle can be determined through calculation and experimentation. length in order to achieve a better water diversion effect.

The invention can convert the kinetic energy of the incoming water of the river into the potential energy, thereby increasing the water level in front of the sluice. At the same time, it is blocked by an L-shaped movable baffle to divert the flow and increase the water intake flow. When the L-shaped movable baffle is not in use, the cable can be relaxed so that the water baffle can be placed along the direction of the water flow without affecting the safety of flood discharge. By changing the size of the baffle, the best backwater effect can be achieved.

Description of drawings

Fig. 1 is the front view of the structural representation of the L-type movable baffle of the present invention;

Fig. 2 is the top view of Fig. 1 schematic diagram;

Fig. 3 is a schematic diagram of the working state of the present invention;

Fig. 4 is a schematic diagram of the non-working state of the present invention.

In the figure, 1. Vertical water baffle, 2. Horizontal water baffle, 3. L-shaped movable baffle, 4. Bushing, 5. Vertical shaft, 6. Gate bottom plate, 7. Anchorage point, 8. Hoist, 9 , cable, 10, oblique support, 11, arc surface, 12, main canal entrance, 13, main canal.

detailed description:

With reference to accompanying drawing, a kind of method for increasing diversion flow with high water level is characterized in that: the method is provided with an L-shaped movable baffle 3 formed by a vertical water-retaining plate 1 and a horizontal water-retaining plate 2; the L-shaped movable baffle 3 A shaft sleeve 4 is fixed on the lower end, and a vertical shaft 5 is arranged in cooperation with the shaft sleeve 4. The vertical shaft 5 is fixed on the gate floor 6 on the downstream side of the main channel entrance 12. The shaft sleeve 4 can rotate around the vertical shaft 5 and drive the L-shaped movement. The baffle 3 rotates together; the horizontal water baffle 2 of the L-shaped movable baffle 3 is parallel to the river bed, and the horizontal water baffle 2 faces the incoming water direction, and the elevation of its upper surface is equal to the elevation of the gate floor; at the upstream of the main canal entrance 12 Anchor point 7 is set on the side, and winch 8 is fixed on the anchor point 7, and one end of dragline 9 on the winch 8 is fixed on the vertical water retaining plate 1 of L-shaped movable baffle 3 . When it is necessary to increase the diversion water level, start the hoist 8 on the anchorage point 7, pull the L-shaped movable baffle 3 to an appropriate position by the drag cable 9, and raise the water level. diversion flow. When not diverting water, loosen dragline 9, under the effect of current, L-shaped movable baffle 3 is placed along the current, so as not to block the flow of water. Since the shape of the river channel, the plane layout of the intake gate, the flow rate of incoming water, the width of the channel, the water depth and other factors vary greatly, the length of the horizontal baffle, the height of the vertical baffle, and the entire L-shaped movable baffle can be determined through calculation and experimentation. 3 length, in order to achieve better water diversion effect. An oblique support 10 is provided between the vertical water retaining plate 1 and the horizontal water retaining plate 2 to increase the strength of the L-shaped movable plate 3; the front end of the vertical water retaining plate 1 is an arc-shaped surface 11, which is convenient to Horizontal shunt. That is to say: from the direction of the incoming water of the river to the direction of the longitudinal axis of the sluice, it is smooth, avoiding sharp turns in the direction of the water flow, and the streamline is relatively smooth.

Claims (3)

1. A method for increasing water diversion flow with a high water level. An anchor point (7) is set on the upstream side of the main canal inlet (12), and the winch (8) is fixed on the anchor point (7). It is characterized in that: the method is provided with a vertical The L-shaped movable baffle (3) composed of the water baffle (1) and the horizontal water baffle (2); the end of the L-shaped movable baffle (3) is fixed with a shaft sleeve (4), and the shaft sleeve (4) Coordinated with a vertical shaft (5), the vertical shaft (5) is fixed on the gate bottom plate (6) on the downstream side of the main canal entrance (12), and the bushing (4) can rotate around the vertical shaft (5) and drive the L-shaped movable stop plate (3) rotates together; the horizontal water retaining plate (2) of the L-shaped movable baffle (3) is parallel to the river bed, and the horizontal water retaining plate (2) faces the incoming water direction, the elevation of its upper surface and the elevation of the gate bottom plate equal; one end of the cable (9) on the hoist (8) is fixed on the vertical water baffle (1) of the L-shaped movable baffle (3); when it is necessary to increase the diversion water level, start the hoist ( 8), pull the L-shaped movable baffle (3) to an appropriate position through the cable (9) to increase the water level, and at the same time, the L-shaped movable baffle (3) plays a diversion role to increase the diversion flow; , loosen the cable (9), and under the action of the water flow, the L-shaped movable baffle (3) is placed along the water flow so as not to block the flow of water. 2. According to the method of increasing water diversion flow with high water level according to claim 1, it is characterized in that: a diagonal support (10) is provided between the vertical water retaining plate (1) and the horizontal water retaining plate (2) , to increase the strength of the L-shaped movable baffle (3). 3. The method for increasing diversion flow according to claim 1, characterized in that: the front end of the vertical water retaining plate (1) is an arc-shaped surface (11), which is convenient to divert the flow horizontally.