Overflow weir with variable upstream water level

Abstract

The invention discloses an overflow weir with a variable upstream water level, and relates to the field of hydraulic engineering, and the overflow weir is characterized by comprising a straight weir and a plurality of trapezoidal extension plates, the trapezoidal extension plates are uniformly distributed along the length direction of the straight weir, the short sides of the trapezoidal extension plates are arranged towards the downstream, and the trapezoidal extension plates comprise a plurality of lifting plates; the lifting plates are arranged in the direction perpendicular to the straight weir, the lifting plates can ascend and descend and are flush with the top face of the straight weir after ascending, the lifting plates close to the straight weir abut against the side edge of the straight weir after ascending, and after the adjacent lifting plates ascend, the top faces of the two adjacent lifting plates are flush, and the edges of the two adjacent lifting plates abut against each other. The water level of the upstream can be controlled, water flowing to the downstream of the overflow weir is clear liquid on the top surface of the upstream and is mixed with less silt, and the water level of the upstream and the water level of the downstream can be adjusted again while the water quality of the downstream is guaranteed.

Description

Technical Field

[0001] The invention relates to the field of water conservancy projects, and more particularly to an overflow weir with variable upstream water level. Background Art

[0002] The overflow weir is a structure for liquid overflow on the tower plate. It has the function of maintaining the liquid layer on the plate and making the liquid overflow evenly. It can be divided into an outlet weir and an inlet weir. The water upstream of the overflow weir will be blocked by the overflow weir, so that the water level upstream can rise until it is higher than the top surface of the overflow weir, and then the water above the overflow weir will flow to the downstream through the overflow weir. Since the water passing through the overflow weir is the upper layer of water from the upstream, it is mostly clear liquid with less sediment, making the water downstream clearer.

[0003] The weir length, also known as the overflow perimeter, is one of the determining factors of water flux. The larger the overflow perimeter, the more places there are for water to overflow, so that in the same amount of time, the water flux is greater, which will lead to a lower water level upstream. By the same token, the smaller the overflow perimeter, the less water flux, and the higher the water level upstream.

[0004] The overflow perimeter of existing overflow weirs is often fixed. When the water flux needs to be controlled, a sluice is often installed on the overflow weir to control the upstream and downstream water levels by opening and closing the sluice. However, this method will cause water mixed with a large amount of sediment in the middle and lower parts of the upstream to flow downstream through the sluice, which will reduce the water quality downstream compared to the method of simply overflowing clear liquid from the overflow perimeter.

[0005] Therefore, a new solution needs to be proposed to solve this problem. Summary of the invention

[0006] In view of the deficiencies in the prior art, an object of the present invention is to provide an overflow weir with a variable upstream water level.

[0007] The above technical purpose of the present invention is achieved through the following technical solutions: an overflow weir with variable upstream water level, including a straight weir and a plurality of trapezoidal extension plates, wherein the plurality of said trapezoidal extension plates are evenly distributed along the length direction of the straight weir, and the short sides of the said trapezoidal extension plates are arranged toward the downstream, and the said trapezoidal extension plates include a plurality of lifting plates, and the plurality of said lifting plates are arranged in a direction perpendicular to the straight weir, the said lifting plates can be lifted and lowered and are flush with the top surface of the straight weir after being lifted, the lifting plates close to the said straight weir are pressed against the side of the straight weir after being lifted, and after the adjacent lifting plates are lifted, the top surfaces of the two are flush and the edges are pressed against each other.

[0008] The present invention is further configured such that: the lifting plate is driven to rise and fall by water.

[0009] The present invention is further configured as follows: a plurality of pool bodies are fixedly connected to the straight weir, the pool bodies include a plurality of water storage chambers, a side of the straight weir facing away from the pool body and the water storage chamber closest to the straight weir are connected or isolated by a sluice gate 1, adjacent water storage chambers and a water storage chamber far from the straight weir and the downstream are connected or isolated by a sluice gate 2, the lifting plate floats by the water in the water storage chamber and the lifting and lowering of the lifting plate is achieved by controlling the water in the water storage chamber.

[0010] The present invention is further configured as follows: the second water gate is lifted and lowered by a second screw-type gate hoist, the top of the screw of the second screw-type gate hoist is rotatably connected to a support plate, the top surface of the support plate is used as a projection surface, and the side of the adjacent lifting plates facing each other passes through the projection surface. When the second screw-type gate hoist closes the second water gate, the support plate on the second screw-type gate hoist contacts the bottom surface of at least one lifting plate.

[0011] The present invention is further configured as follows: a floating block located in a water storage chamber is fixedly connected to the bottom surface of the lifting plate, an opening edge of the water storage chamber extends inward to form a limit block, and a resistance block is fixedly connected to the side surface of the bottom of the floating block, and the resistance block resists the limit block to limit the upward movement of the floating block.

[0012] The present invention is further configured such that: when the lifting plate is at the lowest position, a gap is formed between the floating block and the inner bottom surface of the water storage chamber, and the bottom surface of the floating block is higher than the bottom surface of the first sluice gate or the second sluice gate.

[0013] The present invention is further configured as follows: an upper lip plate is fixedly connected to the top of the straight weir and the top of the lifting plate on the downstream side, and a lower lip plate for contacting the bottom surface of the upper lip plate is fixedly connected to the upstream side of the lifting plate.

[0014] The present invention is further configured such that: the straight weir and the pool body are formed by integrally casting reinforced concrete.

[0015] In summary, the present invention has the following beneficial effects: when a plurality of lifting plates are in a lowered state, the water in the upstream only overflows through the straight weir, the overflow perimeter is small, and there are fewer places where water can overflow, so that the water flux is small in the same time, thereby making the water level in the upstream higher; when the lifting plate close to the straight weir is in an ascending state, since the top surface of the lifting plate is flush with the top surface of the straight weir and the lifting plate and the straight weir are butted together, the water flow can flow from the top surface of the straight weir to the lifting plate, and finally flow from the edge of the lifting plate to the downstream, the edges of the plurality of lifting plates are combined together to overflow at the same time, which is more convenient than only overflowing through the straight weir. The weir overflows and has a larger overflow perimeter. There are more places where water can overflow, so that the water flux is relatively large in the same period of time, which will lower the water level upstream. Similarly, when the above-mentioned lifting plate is raised, the lifting plate adjacent to this lifting plate is raised again, so that the overflow water can extend to the newly raised lifting plate, and the overflow perimeter becomes larger again, there are more places where water can overflow, and the water flux is more, which can further lower the water level upstream. The water flowing from the overflow weir to the downstream is the clear liquid on the top surface of the upstream, with less mud and sand mixed in, which can adjust the water levels upstream and downstream while ensuring the water quality downstream. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a schematic diagram of the local structure of the present invention Figure 1 , used to represent the pool body and straight weir; Figure 3 It is a schematic diagram of the local structure of the present invention Figure 2 , used to represent a trapezoidal extension plate and a local straight weir, and the lifting plate closest to the straight weir is in the raised state; Figure 4 It is a cross-sectional view of the present invention.

[0017] In the figure: 1. straight weir; 2. lifting plate; 3. pool body; 4. water storage chamber; 5. sluice gate 1; 6. sluice gate 2; 7. screw-type gate hoist 1; 8. screw-type gate hoist 2; 9. floating block; 10. limit block; 11. resistance block; 12. gap; 13. upper lip plate; 14. lower lip plate; 15. support plate; 16. resistance strip. DETAILED DESCRIPTION

[0018] The present invention is described in detail below in conjunction with the accompanying drawings and embodiments. Example

[0019] An overflow weir with a variable upstream water level, such as Figure 1 and Figure 3As shown, it includes a straight weir 1 and a plurality of equilateral trapezoidal extension plates, the plurality of trapezoidal extension plates are evenly distributed along the length direction of the straight weir 1, the short sides of the trapezoidal extension plates are arranged toward the downstream, and the long sides of the trapezoidal extension plates are arranged close to the straight weir 1, the trapezoidal extension plates include a plurality of lifting plates 2 arranged in an equilateral trapezoidal shape, and the plurality of lifting plates 2 are arranged in a direction perpendicular to the straight weir 1, the lifting plates 2 can be lifted and lowered and are flush with the top surface of the straight weir 1 after being lifted, the lifting plates 2 close to the straight weir 1 are pressed against the side of the straight weir 1 after being lifted, and the adjacent lifting plates 2 are pressed against the side of the straight weir 1, and the lifting plates 2 are pressed against the side of the straight weir 1 after being lifted. After the plates 2 are all raised, the top surfaces of the two are flush and the edges are pressed together. When several lifting plates 2 are in the state of being lowered, the water in the upstream only overflows through the straight weir 1. The overflow perimeter is small, and there are fewer places where water can overflow, so that the water flux is small in the same time, which will make the water level in the upstream higher. When the lifting plate 2 close to the straight weir 1 is in the rising state, because the top surface of the lifting plate 2 is flush with the top surface of the straight weir 1 and the lifting plate 2 and the straight weir 1 are pressed together, the water flow can flow from the top surface of the straight weir 1 to the lifting plate 2 The water flows up and down the edge of the lifting plate 2, and finally flows to the downstream from the edge of the lifting plate 2. The edges of multiple lifting plates 2 are combined to overflow at the same time. Compared with overflowing only through the straight weir 1, it has a larger overflow perimeter and more places where water can overflow. In the same time, the water flux is more, which will lower the water level upstream. Similarly, in the case where the lifting plate 2 is raised, the lifting plate 2 adjacent to the lifting plate 2 is raised again, so that the overflow water can extend to the newly raised lifting plate 2, and the overflow perimeter becomes larger again, and there are more places where water can overflow. The water flux is more, which can further lower the water level upstream. Similarly, raising another lifting plate 2 can further lower the water level upstream, and different numbers of lifting plates 2 are raised by different trapezoidal extension plates, so that the overflow perimeter size of the overflow weir can be adjusted in more gears, so that the upstream water level height adjustment options are more, and the water flowing from the overflow weir to the downstream is the clear liquid on the top surface of the upstream, which is less mixed with sediment, and can adjust the upstream and downstream water levels while ensuring the downstream water quality.

[0020] like Figure 2 and Figure 4As shown, the lifting plate 2 is driven to rise and fall by water. Water is the most common substance in the environment where the overflow weir is located. The lifting plate 2 is driven to rise and fall by water, which has low cost. Specifically, a plurality of tank bodies 3 are fixedly connected to the straight weir 1. The plurality of tank bodies 3 are evenly spaced along the length direction of the straight weir 1. The straight weir 1 and the tank body 3 are formed by integrally casting reinforced concrete, so that the straight weir 1 and the tank body 3 have a strong connection strength, which can improve the bearing capacity of the straight weir 1 and is safer. The tank body 3 includes a plurality of water storage chambers 4, and the number of water storage chambers 4 is consistent with the number of lifting plates 2. The side of the straight weir 1 facing away from the tank body 3 and the water storage chamber 4 closest to the straight weir 1 are connected or separated by a sluice 5. The adjacent water storage chambers 4 and the water storage chambers far away from the straight weir 1 are connected or separated. 4 and the downstream are both connected or isolated by a sluice gate 2 6, the lifting plate 2 floats through the water in the water storage chamber 4 and the water in the water storage chamber 4 is controlled to realize the lifting and lowering of the lifting plate 2, the bottom surface of the lifting plate 2 is integrally formed with a floating block 9 located in the water storage chamber 4, the floating block 9 is made of plastic and has a hollow structure, and has the characteristic of floating on the water surface, so that the water body can drive the lifting plate 2 to rise and fall, the opening edge of the water storage chamber 4 extends inward to form a limit block 10 made of reinforced concrete, the side of the bottom of the floating block 9 is fixed with a resistance block 11 made of plastic and also has a hollow structure by bolts, the resistance block 11 resists the limit block 10 to limit the upward movement of the floating block 9, and the resistance block 11 and the side of the bottom of the floating block 9 resist the inner wall of the water storage chamber 4, When the lifting plate 2 closest to the straight weir 1 needs to rise, the water on the upstream side of the straight weir 1 can be allowed to enter the water storage chamber 4 by opening the sluice gate 2 6, so that the water level in the water storage chamber 4 rises, thereby driving the floating block 9 to rise, and then the water body can drive the lifting plate 2 to rise, thereby increasing the overflow circumference. During the process, the resistance block 11 is pressed against the limit block 10, so as to limit the rising distance of the floating block 9 and the lifting plate 2, so as to facilitate the control of the top surface of the lifting plate 2 and the top surface of the straight weir 1 to be flush. At the same time, because the resistance block 11 and the side surface of the bottom of the floating block 9 are pressed against the inner wall of the water storage chamber 4, the water level in the water storage chamber 4 rises to the point where the resistance block 11 is pressed against the limit block 10, and the water can only pass through the resistance block 11 and the floating block 9 and the inner wall of the water storage chamber 4. When the gap between the two rises, the amount of water entering the sluice gate 2 6 is less, and a relatively stable state is reached. Similarly, when other lifting plates 2 rise, it is convenient to open the corresponding sluice gate 1 5. The two sluice gates 1 5 on both sides of the water storage chamber 4 or one sluice gate 1 5 and one sluice gate 2 6 are closed when the floating block 9 in the water storage chamber 4 floats to the limit position, so as to keep the lifting plate 2 in an ascending state. When the lifting plate 2 needs to be lowered, the water supply to multiple water storage chambers 4 can be stopped by closing the sluice gate 2 6. At the same time, the sluice gate 1 5 between the water storage chamber 4 away from the straight weir 1 and the downstream can be opened for drainage. Moreover, by controlling multiple sluice gates 1 5, multiple water storage chambers 4 can be waterproofed at the same time or a single water storage chamber 4 can be waterproofed, and the control is relatively simple and convenient.

[0021] Further, such as Figure 4 As shown, when the lifting plate 2 is at the lowest point, a gap 12 is formed between the floating block 9 and the inner bottom surface of the water storage chamber 4, and the bottom surface of the floating block 9 is higher than the bottom surface of the sluice gate 1 5 or the sluice gate 2 6. After the sluice gate 1 5 and the sluice gate 2 6 are opened, the water flow can immediately enter the water storage chamber 4 without being interfered by the floating block 9, so that the water in the water storage chamber 4 can lift the floating block 9. Similarly, when the water storage chamber 4 is drained, the gap 12 between the floating block 9 and the inner bottom surface of the water storage chamber 4 can also make the water in the water storage chamber 4 drain more smoothly.

[0022] like Figure 1 and Figure 2 As shown, the sluice gate 1 5 is raised and lowered by a screw-type gate hoist 1 7, and the sluice gate 2 6 is raised and lowered by a screw-type gate hoist 2 8. The screw-type gate hoist is a machine that is connected to the gate leaf with a threaded rod directly or through a guide slider and a connecting rod, and the screw moves up and down to open and close the gate, thereby facilitating the opening or closing of the sluice gate 1 5 and the sluice gate 2 6. The top of the screw of the screw-type gate hoist 2 8 is rotatably connected to a support plate 15, with the top surface of the support plate 15 as the projection surface, and the side of the adjacent lifting plates 2 facing each other passes through the projection surface. When the screw-type gate hoist 2 8 closes the sluice gate 2 6, the screw-type gate hoist 2 8 is moved upward. The support plate 15 contacts the bottom surface of at least one lifting plate 2. When the screw-type gate hoist 28 closes the sluice gate 26, the position of the screw on the screw-type gate hoist 28 remains unchanged. The support plate 15 can support the lifting plate 2, making the lifting plate 2 more stable. The support plate 15 and the screw on the screw-type gate hoist 28 are rotationally connected, so that when the screw on the screw-type gate hoist 28 rotates, the support plate 15 contacts the bottom surface of the lifting plate 2, and the support plate 15 and the screw on the screw-type gate hoist 28 rotate relative to each other without causing severe friction between the support plate 15 and the lifting plate 2.

[0023] like Figure 4As shown, the top of the straight weir 1 and the top of the lifting plate 2 are integrally formed with a rectangular upper lip plate 13 on the downstream side, and the lifting plate 2 is integrally formed with a rectangular lower lip plate 14 on the upstream side, which is used to abut the bottom surface of the upper lip plate 13. When the lifting plate 2 rises and is combined with the top surface of the straight weir 1 and when the lifting plate 2 and the lifting plate 2 rise and are combined, the upper lip plate 13 and the lower lip plate 14 abut against each other, and the gap at the joint of the upper lip plate 13 and the lower lip plate 14 has a tortuous feature, which can prevent water from leaking between the two lifting plates 2 or between the lifting plate 2 and the straight weir 1, including that the water can extend to all the raised lifting plates 2, which can stably increase the overflow circumference, and the upper lip plate 13 can position the lower lip plate 14, which can limit the further rise of the lifting plate 2 , thereby ensuring that all the lifting plates 2 can rise to the same height and that the water can flow to all the raised lifting plates 2. A reinforced concrete structure and a cuboid-shaped interference strip 16 are installed on the straight weir 1. The interference strip 16 is arranged in a horizontal direction. When the lifting plate 2 closest to the straight weir 1 drops to the bottom, the lower lip plate 14 on it contacts the top surface of the interference strip 16, so that after the lifting plate 2 is lowered, the upper lip plate 13 on the lifting plate 2 contacts the lower lip plate 14 on the adjacent lifting plate 2, and the lower lip plate 14 on the lifting plate 2 contacts the interference strip 16, which can stabilize the lifting plate 2. After the other lifting plates 2 are lowered, their upper lip plates 13 will contact the lower lip plates 14 on the adjacent lifting plates 2, and the other side will contact the support plate 15, which also has good stability.

[0024] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. An overflow weir with a variable upstream water level, comprising a straight weir (1), characterized in that: It also comprises a plurality of trapezoidal extension plates, which are evenly distributed along the length direction of the straight weir (1), with the short sides of the trapezoidal extension plates arranged toward the downstream, and the trapezoidal extension plates comprise a plurality of lifting plates (2), which are arranged in a direction perpendicular to the straight weir (1), the lifting plates (2) can be lifted and lowered and are flush with the top surface of the straight weir (1) after being lifted, the lifting plates (2) close to the straight weir (1) are pressed against the side of the straight weir (1) after being lifted, and after the adjacent lifting plates (2) are lifted, the top surfaces of the two are flush and the edges are pressed against each other.

2. The overflow weir with variable upstream water level according to claim 1, characterized in that: The lifting plate (2) is driven to rise and fall by water.

3. The overflow weir with variable upstream water level according to claim 2, characterized in that: A plurality of tank bodies (3) are fixedly connected to the straight weir (1), and the tank bodies (3) include a plurality of water storage chambers (4). A first sluice gate (5) is used to connect or disconnect a side of the straight weir (1) facing away from the tank body (3) and a water storage chamber (4) closest to the straight weir (1). A second sluice gate (6) is used to connect or disconnect adjacent water storage chambers (4) and a water storage chamber (4) far from the straight weir (1) and a downstream side. The lifting plate (2) floats by means of water in the water storage chamber (4), and the lifting plate (2) is lifted or lowered by controlling the water in the water storage chamber (4).

4. The overflow weir with variable upstream water level according to claim 3, characterized in that: The water gate 2 (6) is raised and lowered by a screw-type gate hoist 2 (8). The top of the screw of the screw-type gate hoist 2 (8) is rotatably connected to a support plate (15). The top surface of the support plate (15) is used as a projection surface. The side of the adjacent lifting plates (2) facing each other passes through the projection surface. When the screw-type gate hoist 2 (8) closes the water gate 2 (6), the support plate (15) on the screw-type gate hoist 2 (8) contacts the bottom surface of at least one lifting plate (2).

5. The overflow weir with variable upstream water level according to claim 3, characterized in that: The bottom surface of the lifting plate (2) is fixedly connected to a floating block (9) located in the water storage chamber (4); the opening edge of the water storage chamber (4) extends inward to form a limit block (10); the side surface of the bottom of the floating block (9) is fixedly connected to a resistance block (11); the resistance block (11) resists the limit block (10) to limit the upward movement of the floating block (9).

6. The overflow weir with variable upstream water level according to claim 5, characterized in that: When the lifting plate (2) is at the lowest position, a gap (12) is formed between the floating block (9) and the inner bottom surface of the water storage chamber (4), and the bottom surface of the floating block (9) is higher than the bottom surface of the first sluice gate (5) or the second sluice gate (6).

7. The overflow weir with variable upstream water level according to claim 1, characterized in that: The top of the straight weir (1) and the top of the lifting plate (2) are both fixedly connected to an upper lip plate (13) on the side facing downstream, and the lifting plate (2) is fixedly connected to a side facing upstream with a lower lip plate (14) for contacting the bottom surface of the upper lip plate (13).

8. The overflow weir with variable upstream water level according to claim 3, characterized in that: The straight weir (1) and the pool body (3) are both formed by integrally casting reinforced concrete.

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