Surrounding reservoir layered water taking device and working method

Abstract

This invention provides an enclosed reservoir stratified water intake device and its operating method. The enclosed reservoir stratified water intake device includes wing walls at both ends of the intake, multiple cable towers, a main cable, a curtain, multiple longitudinal cables, multiple transverse cables, and multiple pontoons. The upper end of each longitudinal cable is connected to the main cable, and the lower end of each longitudinal cable is anchored to the reservoir bank by ground anchors. Multiple longitudinal cables and multiple transverse cables are interwoven to form nodes. Vertical rails are provided on the wing walls and cable towers. Pullers are provided at the ends of each transverse cable, the ends of the main cable, and nodes adjacent to the cable towers. The pullers are adapted to the rails. The curtain is connected to the multiple longitudinal cables and multiple transverse cables. Multiple pontoons are connected to the main cable, and the pullers at the ends of the main cable are connected to an adjacent pontoon via rigid connection devices. This invention ensures a sufficient safe distance from the intake at all times under water level drawdown conditions.

Description

Technical Field

[0001] This invention relates to the fields of water conservancy and hydropower engineering and ecological environment protection technology, and in particular to an enclosed reservoir stratified water intake device and its working method. Background Technology

[0002] After reservoirs with a large ratio of storage capacity to annual river runoff are filled, the water temperature in the reservoir area exhibits a clear vertical stratification phenomenon. The water temperature gradually decreases with increasing depth. In some reservoirs in southern my country, the temperature difference between the bottom and surface water can reach 20℃. Because the water intake is generally located below the dead water level, water is usually drawn from the middle and lower layers, which are generally 2-13℃ lower in temperature than the downstream natural river channel.

[0003] Low-temperature water released from reservoirs affects the aquatic ecosystem of downstream rivers, impacting the entire life cycle of aquatic animals, especially rare fish, and even depriving them of suitable spawning environments. Irrigation with low-temperature water also affects crop metabolism, leading to reduced crop yields, such as peanut pods yield reductions of over 20% and rice yield reductions of 32.1% to 56.5%, severely impacting agricultural production and farmers' income.

[0004] To mitigate the adverse effects of low-temperature water from reservoirs on downstream aquatic ecosystems and agriculture, the engineering community has proposed various stratified water intake measures suitable for high dams and large reservoirs, such as front retaining walls, stacked beam gates, and river-blocking water-retaining curtain walls. Front retaining walls have a simple structure and low investment, but their water temperature mitigation effect is poor, and they cannot draw water from different elevations based on actual conditions. Stacked beam gates control the water intake elevation by installing stacked beam gates at the inlet, achieving stratified water intake. These gates can draw water from different elevations based on actual conditions, resulting in better water temperature mitigation. However, the operation and scheduling of stacked beam gates are complex, requiring still water for opening and closing, which affects the normal power generation operation of the power station. River-blocking water-retaining curtain walls are currently only implemented at the Sanbanxi Hydropower Station, offering good water temperature mitigation and convenient operation. However, this technology requires suitable engineering layout conditions; the power station's flood discharge must not pass through the main river channel blocked by the water-retaining curtain wall, otherwise the project's safety is uncontrollable, and it must not conflict with the layout of existing key structures. In addition, for newly built reservoirs and hydropower stations, there is silt and sediment at the bottom of the reservoir, which will prevent the river-blocking water-resistant curtain wall from operating normally.

[0005] As shown in Figure 1, the existing curtain 12 mainly adopts longitudinal force. Therefore, when the normal water level drops to the dead water level, the curtain 12 bulges out a large "belly" in the downstream direction of the water flow, causing the curtain 12 to be too close to the water inlet, which poses a safety risk to the main structure.

[0006] For example, the existing patent application publication number CN118911090A discloses a layered water intake structure for a hydropower station, which is a rigid-flexible composite water intake structure with a front retaining wall at the bottom and a water-resistant curtain wall at the top. Although this device is also an enclosed water intake structure, the horizontal cables are disconnected from multiple wing walls, making the longitudinal cables the main load-bearing structure. It is only suitable for reservoirs and hydropower stations with a small water level drawdown depth. Otherwise, it cannot guarantee the safe distance between the flexible curtain and the water intake under low water level conditions. Summary of the Invention

[0007] In response to problems such as poor water temperature improvement effect of the front retaining wall, harsh operating conditions of the stacked beam gate, the impact of the river-blocking water curtain wall on flood discharge, and the adverse effects of siltation, this invention proposes a reservoir layered water intake device and working method with front enclosure at the water inlet, which ensures that a sufficient safe distance is always maintained from the water inlet under the condition of reservoir water level fluctuation.

[0008] The technical solution of the present invention is: an enclosed reservoir stratified water intake device, comprising wing walls at both ends of the water inlet, multiple cable towers at the water inlet end, a main cable, and a curtain, characterized in that it further comprises multiple longitudinal cables, multiple transverse cables, and multiple pontoons; the upper end of each longitudinal cable is connected to the main cable, and the lower end of each longitudinal cable is anchored to the reservoir bottom by ground anchors; the multiple longitudinal cables and multiple transverse cables are interwoven to form nodes; the wing walls and cable towers are vertically provided with slide rails, and each transverse cable end, the end of the main cable, and the node adjacent to the cable tower are provided with pulleys, the pulleys being adapted to the slide rails; the curtain is connected to the multiple longitudinal cables and multiple transverse cables; multiple pontoons are connected to the main cable, and the pulleys at the end of the main cable are connected to an adjacent pontoon through a rigid connection device.

[0009] In the above scheme, the horizontal cables are designed as an integrated structure, connecting the wing walls and the towers respectively. Trolleys that slide with the towers are set at the nodes, and trolleys that slide with the wing walls are set at the ends of the horizontal cables. There is no retaining wall below the curtain, so that the curtain adopts the main horizontal force. Multiple horizontal cables slide at multiple points along the towers. As the water level changes, only the sliding points of the horizontal cables slide up and down. The main force of the horizontal cables can constrain the distance of the curtain bulging towards the water inlet under low water conditions, limiting the distance of the curtain protruding downstream and ensuring a sufficient safety distance.

[0010] Preferably, the slide rail is provided on the outer surface of the cable tower so that the curtain surrounds the outside of the cable tower.

[0011] Preferably, each of the wing walls and each tower is equipped with a winch, and the wire rope on the winch is connected to a pulley on the main cable.

[0012] Preferably, multiple trolleys on the same slide rail are connected by ropes.

[0013] Preferably, one end of the wing wall is connected to the side wall of the water inlet, and the slide rail is installed at the other end of the wing wall.

[0014] Preferably, the cable tower is cylindrical; connecting beams are provided between the wing wall and the top of the cable tower, and between the tops of multiple cable towers.

[0015] Preferably, the sag-to-span ratio of the transverse cable is smaller than that of the longitudinal cable. The sag-to-span ratio of the transverse cable refers to the ratio of the sag of the transverse cable between two pulleys to its span, while the sag-to-span ratio of the longitudinal cable refers to the ratio of the sag of the longitudinal cable between the pontoon or main cable and the ground anchor to its span.

[0016] The present invention also provides a method for operating the above-mentioned enclosed reservoir stratified water intake device, comprising: When the reservoir is at its normal water level, the pontoon drives the main cable to the water surface, so that the curtain adapts to the appropriate water-blocking elevation, ensuring that the top of the curtain has a certain flow height (flow height: the height from the top of the curtain to the water surface). As the water level drops, the draft of the pontoon decreases, the buoyancy provided decreases, the pontoon near the wing wall and the tower drives the pulley at the end of the main cable to descend, the end pulley drives the pulley on each cross cable to descend, the water-blocking elevation of the curtain decreases, causing the curtain to fold between every two cross cables, the maximum distance the curtain bulges toward the water inlet is half the distance between the two cross cables. When the water level rises, the draft of the pontoon increases, providing greater buoyancy. The pontoons near the wing walls and towers drive the pulleys at the ends of the main cables to rise, and the end pulleys drive the pulleys on each cross cable to rise, raising the water-blocking elevation of the curtain.

[0017] Preferably, a working program for the winch is set so that, during the process of multiple trolleys adapting to changes in water level, if the program determines that the sliding position of the trolley deviates from the expected position, the winch is activated to adjust the sliding trajectory of the trolley. Simultaneously, a working program for adjusting the top overflow height of the winch is set so that the curtain is raised in spring to lower the top overflow height, and the curtain is lowered in winter to increase the top overflow height.

[0018] Preferably, the nodes of the top horizontal and vertical cables are connected by flexible ropes. When the actual load borne by the curtain exceeds the design load value, the flexible rope at the node breaks actively; when the actual load borne by the curtain drops below the design load value, the curtain is lifted and a new flexible rope is replaced.

[0019] Preferably, the safety factor of the flexible rope is less than the safety factor of the entire waterproof curtain wall system.

[0020] Compared with related technologies, the beneficial effects of the present invention are as follows: I. The present invention designs the horizontal cable as an integrated structure, connecting the wing wall and the tower respectively, and setting a pulley that slides with the tower at the node, and setting a pulley that slides with the wing wall at the end of the horizontal cable. There is no retaining wall below the curtain, so that the curtain is mainly subjected to horizontal force. The horizontal cable can constrain the distance of the curtain bulging towards the water inlet under low water level conditions, ensuring a sufficient safety distance. Second, this invention has a good water temperature improvement effect, can operate adaptively, avoids flood discharge structures, dynamically surrounds the water intake, and has the function of multi-point sliding adaptive adjustment of reservoir stratified water intake; it is suitable for large and medium-sized hydropower stations, and adopts a multi-tower and lateral force system to ensure that the distance from the water intake is always sufficient under the condition of water level fluctuation. Third, the present invention designs the horizontal cable as an integrated structure, connecting the wing wall and the tower respectively, and setting the pulley that slides with the tower at the node, and setting the pulley that slides with the wing wall at the end of the horizontal cable. There is no retaining wall below the curtain, so that the curtain adopts the horizontal main force. Multiple horizontal cables slide at multiple points along the tower. As the water level changes, only the sliding point of the horizontal cable slides up and down. The horizontal cable can constrain the distance of the curtain bulging towards the water inlet under low water level conditions, so that the distance of the curtain protruding downstream is limited, ensuring a sufficient safety distance. Fourth, in order to ensure that the transverse direction is the main force direction, the present invention adjusts the sag-span ratio of the transverse cable to be different from that of the longitudinal cable, and the sag-span ratio of the transverse cable is smaller than that of the longitudinal cable; in this way, under low water level conditions, the transverse cable can restrain the curtain from bulging towards the water inlet side, ensuring a safe distance between the layered water intake device and the water inlet, making it safer and more reliable, and posing no potential risks or adverse effects on the main structure. V. The elevation of the water-blocking curtain of this invention adaptively adjusts with changes in water level, making scheduling convenient. It can block low-temperature water, increase the temperature of the water discharged from the power station, and improve the downstream ecological environment; VI. This invention adopts a wing wall and multi-tower support system, and the curtain adopts the horizontal direction as the main stress direction, which increases the safe distance between the water-blocking curtain and the water inlet, and ensures the safe operation of the generator set. 7. All cross cables and main cables can slide up and down along the towers and wing walls, ensuring that the water-retaining elevation is controllable and adjustable under any operating condition. For example, the water-retaining elevation can be raised during the spring fish breeding and agricultural planting season to release hot water; the water-retaining elevation can be lowered during the winter to release cold water, which is in line with the natural ecological environment of the river. 8. The sliding rails are set on the outer surface of the tower, and the curtain is enclosed on the outside of the tower, which eliminates water leakage at the connection point and has a good effect on low temperature water. 9. Winches are installed on the wing walls and the top of the towers. The winches are directly connected to the pulleys. When the buoyancy is insufficient to adaptively adjust the curtain wall elevation, the winches are used to adjust the position of the pulleys to control the water-blocking elevation and ensure the safety and reliability of the system. Attached Figure Description

[0021] Figure 1 is a cross-sectional schematic diagram of the existing waterproof curtain wall in operation (where a is the normal water level; b is the dead water level). Figure 2 A plan view of the inlet arrangement of the enclosed reservoir stratified water intake device provided by the present invention; Figure 3 is a schematic diagram of the operation of the enclosed reservoir stratified water intake device provided by the present invention (where a is the normal water level; b is the dead water level). Figure 4 A schematic diagram showing the connection of multiple trolleys; Figure 5 A schematic diagram showing the connection between the pulley at the end of the main cable and the adjacent pontoon; Figure 6 is a cross-sectional schematic diagram of the operation of the enclosed reservoir stratified water intake device provided by the present invention (where a is the normal water level; b is the dead water level).

[0022] In the attached diagram: 1. Wing wall; 2. Tower; 3. Winch; 4. Connecting beam; 5. Float; 6. Pulley; 7. Slide rail; 8. Longitudinal cable; 9. Transverse cable; 10. Main cable; 11. Ground anchor; 12. Curtain; 13. Water inlet; 14. Rope; 15. Rigid connection device; 16. Node. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other. For ease of description, the terms "upper," "lower," "left," and "right" used below only indicate that they correspond to the upper, lower, left, and right directions in the accompanying drawings and do not limit the structure.

[0024] like Figure 2 As shown, the enclosed reservoir stratified water intake device provided in this embodiment includes wing walls 1 set at both ends of the water inlet 13, multiple cable towers 2 set at the water inlet end of the water inlet 13, main cable 10, curtain wall system and winch 3.

[0025] The wing wall 1 and the pylon 2 mainly provide support points for the enclosed structure, providing lateral support for the entire system. The wing wall 1 is arranged on both sides of the inlet, with one end directly connected to the side wall of the inlet, and the other end having a sliding rail 7 installed on its side.

[0026] The pylon 2 is located at the corner of the enclosing axis and at the mid-span, forming the support system of this device. The outer surface (water-facing side) of the pylon 2 is equipped with sliding rails 7. The pylon 2 adopts a cylindrical cross-section to reduce the impact on the water flow pattern and reduce wear on the curtain wall system.

[0027] As shown in Figure 3, connecting beams 4 are installed at the top of the wing wall 1 and the towers 2, as well as between the multiple towers 2. The connecting beams 4 can increase the overall rigidity of the wing wall 1 and the towers 2, and better resist seismic action and dynamic water load. The top elevation of the wing wall 1, the towers 2 and the connecting beams 4 are consistent with the top elevation of the water inlet 13, forming a traffic bridge, which facilitates operation, maintenance and repair.

[0028] The curtain wall system primarily blocks low-temperature water while allowing high-temperature surface water to pass through. It can rise and fall with the pontoon 5 to adjust the water-blocking elevation of the curtain wall. The curtain wall system mainly includes horizontal cables 9, longitudinal cables 8, ground anchors 11, and a curtain wall 12. The ground anchors 11 are located within the bottom plate of the intake channel 13, providing a smooth interface to reduce leakage from the reservoir bottom due to natural terrain and wear on the curtain wall. The horizontal cables 9 and longitudinal cables 8 intertwine to form a load-bearing framework. The upper end of each longitudinal cable 8 is connected to the main cable 10, and the lower end of each longitudinal cable 8 is connected to the ground anchor 11. Each horizontal cable 9, the main cable 10, and the node 16 adjacent to the tower 2 are equipped with a pulley 6, which is adapted to the slide rail 7. Multiple pulleys 6 on the same slide rail 7 can achieve multi-point sliding. All horizontal cables 9 can slide up and down along the tower 2 and wing wall 1, providing better regulation performance for reservoirs with large drawdown depths. The curtain 12 is connected to multiple longitudinal cables 8 and multiple transverse cables 9. Multiple pontoons 5 are connected to the main cable 10, and the pulley 6 at the end of the main cable 10 is connected to an adjacent pontoon 5 via a rigid connection device 15 (e.g., ...). Figure 5 (As shown).

[0029] The pontoon 5 provides buoyancy, ensuring that the waterproof curtain wall can adaptively adjust its water-blocking elevation according to the water level. The pontoons 5 are connected in series by the main cable 10 to form a whole, providing buoyancy for the system and keeping it floating on the water surface as the water level changes.

[0030] Multiple trolleys 6 on the same rail 7 are connected in series by rope 14 (e.g.) Figure 4 (As shown). As the reservoir water level rises, the end pontoon 5 drives the first pulley 6 to rise, and the first pulley 6 drives the lower pulley 6 to slide and rise in sequence through the connecting ropes 14 between the pulleys 6.

[0031] Winches 3 are installed at the top of both the wing wall 1 and the tower 2. The wire ropes on the winches 3 are connected to the pulleys 6 on the main cable 10. When the buoyancy is insufficient to adaptively adjust the curtain wall elevation, the winches 3 are used to adjust the position of the pulleys 6 to control the water-blocking elevation and ensure the safety and reliability of the system. At the same time, a working program is set for the winches 3 to adjust the top overflow height. In spring, when fish spawning season requires higher water temperatures, the curtain 12 is raised, and the top overflow height (the height from the top of the curtain to the water surface) is lowered, allowing only the surface high-temperature water to be drawn. In winter, when fish gonad development season requires lower water temperatures to stimulate gonad maturation, the curtain 12 is lowered, increasing the top overflow height and allowing low-temperature water to be drawn.

[0032] The enclosed reservoir stratified water intake device is located close to the water inlet 13. To avoid adverse effects on the water inlet 13 due to system failure, a safety analysis must be conducted. An active safety design method is adopted for the system, such as connecting the top horizontal cable 9 and the top vertical cable 8 at node 16 via flexible ropes. The safety factor of the flexible rope is less than the overall safety factor of the curtain wall system. When the actual load on the curtain 12 exceeds the design load value, the node flexible rope actively breaks, the top curtain 12 falls and is held in place by the top horizontal cable 9, ensuring that the fallen curtain 12 still has sufficient distance from the water inlet, guaranteeing that system failure does not affect the safety of the water inlet. The fall of the top curtain 12 will significantly increase the flow cross-section, reducing the load on the curtain wall system and maintaining the overall safety of the structural system. When the actual load on the curtain 12 decreases below the design load value, the curtain 12 is lifted and a new flexible rope is replaced. For example, the structural system safety factor is 2.0, and the safety factor at the flexible rope connection is 1.80.

[0033] The enclosed reservoir tiered water intake device adopts a transverse main force direction, and all horizontal cables 9 can slide up and down along the tower 2. Existing waterproof curtain walls mostly adopt a longitudinal main force direction, with only the main cable sliding up and down along the tower, causing the curtain to rise and fall. When the reservoir water level is low, as shown in Figure 1, the curtain bulges significantly downstream, causing it to be too close to the water inlet, posing a safety risk to the main structure. This invention adopts a transverse main force direction, with the horizontal cables 9 sliding at multiple points along the tower 2. As the water level changes, only the sliding points of the horizontal cables 9 move up and down, limiting the downstream protrusion of the curtain 12, as shown in Figure 6. This ensures a safe distance between the tiered water intake device and the water inlet 13, making it safer and more reliable, with no potential risks or adverse effects on the main structure.

[0034] To ensure that the transverse direction is the primary load-bearing direction, the sag-to-span ratio of the transverse cable 9 is adjusted to be different from that of the longitudinal cable 8, with the transverse cable 9 having a smaller sag-to-span ratio than the longitudinal cable 8. This way, under low water level conditions, the transverse cable 9 can restrain the curtain 12 from bulging towards the water inlet, ensuring a safe distance between the stratified water intake device and the water inlet, making it safer and more reliable, and posing no potential risk or adverse impact on the main structure. Figure 2 As shown in Figure 1, the sag-to-span ratio of the transverse cable refers to the ratio of the sag of the transverse cable between two pulleys to its span. Similarly, the sag-to-span ratio of the longitudinal cable refers to the ratio of the sag of the longitudinal cable between the pontoon or main cable and the ground anchor to its span.

[0035] The present invention also provides a method for operating the above-mentioned enclosed reservoir stratified water intake device, comprising the following steps: When the reservoir is at its normal water level, the pontoon 5 drives the main cable 10 and the curtain 12 to rise, so that the curtain 12 is at a suitable water-blocking elevation.

[0036] When the water level drops, the draft of the pontoon 5 decreases, and the buoyancy provided decreases. The pontoon 5 near the wing wall 1 and the tower 2 drives the pulley 6 at the end of the main cable 10 to descend. The end pulley 6 drives the pulley 6 on each cross cable 9 to descend, and the water-blocking elevation of the curtain 12 decreases, causing the curtain 12 to fold between every two cross cables 9. The maximum distance that the curtain 12 bulges toward the water inlet 13 is half the distance between the curtain 12 connected to the two cross cables 9.

[0037] When the water level rises, the draft of the pontoon 5 increases, providing greater buoyancy. The pontoon 5 near the wing wall 1 and the tower 2 drives the pulley 6 at the end of the main cable 10 to rise. The end pulley 6 drives the pulley 6 on each cross cable 9 to rise, raising the water-blocking elevation of the curtain 12. Example

[0038] A hydroelectric power station has a normal reservoir level of 2010m and a dead water level of 1939m. The intake tower is 210m wide, with a bottom elevation of 1914m and a top elevation of 2016m. Based on ecological requirements, this project needs to draw surface water at normal temperature within 10m of the water meter during the spring fish breeding season. Calculations based on seismic action, hydraulic models, and cable net models show that the wing wall of the project is 40m long and 8m wide; three cable towers are required, each with a diameter of 9m; the bottom elevation of the cable towers and wing walls is 1914m, and the top elevation is 2016m. The maximum load on the horizontal cable 9 is approximately 42t, meaning the horizontal load on the pulley is 42t. The design dimensions of a single pulley 6 are approximately 1.2m * 1.2m * 0.8m.

[0039] Before the hydropower station impounds water, the wing wall 1, cable tower 2, and ground anchor 11 are constructed using dry construction methods. Slide rails 7 are pre-embedded on the wing wall 1 and cable tower 2, and pulleys 6 and winches 3 are installed. After the reservoir is impounded, the buoyancy of the water is used to splice and install the pontoon 5 and the curtain wall system (horizontal cables 9, longitudinal cables 8, and curtain 12).

[0040] After water storage, the first step is to install the main cable 10: Using a winch 3, the main cable 10 is unwound from one side wing wall 1 and connected to the top pulley 6. It is then connected to the three cable towers 2 via the pulley 6, and finally fixed to the pulley 6 on the other side wing wall 1, forming a "[" shape surrounding the inlet 13 (e.g., ...). Figure 2 (As shown).

[0041] The second step is to install the pontoon system: the pontoon 5 is installed through the top connecting beam 4 of the cable tower 2 system. The pontoon 5 is transported to the vicinity of the main cable 10 via the water surface and installed onto the main cable 10 using cable clamps.

[0042] The third step is the installation of the curtain wall system: First, a temporary floating platform 5 is assembled on the water surface to form an operating platform. The curtain wall system is then assembled and deployed on this platform. The curtain wall system is lowered using a pulley system, winch system, and traction ropes. When it approaches the ground anchor 11, an underwater robot connects the longitudinal cables 8 to the ground anchor 11 and connects the transverse cables 9 and pulleys 6 from the bottom up. Once all the longitudinal cables 8 are connected to the ground anchor 11 and all the transverse cables 9 are connected to the pulleys 6 of the wing walls 1 and the tower 2, the installation of the curtain wall system is complete. The top traction rope of the curtain wall system is then temporarily fixed to the main cable.

[0043] The fourth step involves using traction ropes to pull the curtain wall system to the bottom of the pontoon 5, releasing the temporary fixation, and securing the upper end of the longitudinal cable 8 of the curtain wall system to the pontoon 5. At this point, the entire installation is complete.

[0044] like Figure 3a As shown, at the normal water level of the reservoir, the pontoon 5 and main cable 10 are located at 2010m, the flow height at the top of the curtain wall system is 10m, the flow velocity is 1.05m / s, and the head loss meets the requirements. When the water level drops, the draft of the pontoon 5 decreases, the buoyancy it provides decreases, and it moves downward under the action of the curtain wall system. The end pontoon 5 drives the top trolley 6 to descend. The descent of the top trolley 6 is driven by the rope 14 series system between the trolleys 6, causing all the trolleys 6 to slide downward as sliding points, thus reducing the water-retaining elevation of the curtain wall. Figure 3b As shown, when the water level drops to the dead water level of 1939, all the trolleys 6 are stacked on the slide rails, and the top overflow height is 12.5m, which meets the requirements. When the water level rises, the draft of the float box 5 increases, providing more buoyancy. The end float box 5 drives the top trolley 6 to rise. The rise of the top trolley 6 is connected by the rope 14 system between the trolleys 6, causing all the trolleys 6 to slide upwards as sliding points, raising the water-blocking elevation of the curtain wall. During the multi-point sliding adaptive water level change process, the winch 3 is controlled by a pre-set program. When the program determines that the sliding of the trolley 6 deviates from the expected direction, it automatically calls the winch 3 to adjust the sliding trajectory of the trolley 6, ensuring the entire operation is safe and error-free.

[0045] The system employs an active safety design. When encountering extreme conditions where the overall load exceeds the design total load, the connection node between the first transverse cable and all longitudinal cables at the top is actively destroyed, reducing the total load of the system and ensuring the overall safety of the structure. Once the dangerous condition is resolved, the system can be restored by using a winch to lift it and replacing the connection between the first transverse cable and longitudinal cables (such as a flexible rope).

[0046] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A stratified water intake device for an enclosed reservoir, comprising wing walls (1) at both ends of an inlet (13), multiple cable towers (2) at the water intake front end of the inlet (13), a main cable (10), and a curtain (12), characterized in that, It also includes multiple longitudinal cables (8), multiple transverse cables (9), and multiple pontoons (5). The upper end of each longitudinal cable (8) is connected to the main cable (10), and the lower end of each longitudinal cable (8) is anchored to the bottom of the reservoir by ground anchors (11). Multiple longitudinal cables (8) and multiple transverse cables (9) are interwoven to form nodes (16). Vertical rails (7) are provided on both the wing wall (1) and the tower (2). A pulley (6) is provided on the end of each transverse cable (9), the end of the main cable (10), and the node (16) adjacent to the tower (2). The pulley (6) is adapted to the rail (7). The curtain (12) The main cable (10) is connected to multiple longitudinal cables (8) and multiple transverse cables (9); multiple pontoons (5) are connected to the main cable (10), and the pulleys (6) at the end of the main cable (10) are connected to an adjacent pontoon (5) through a rigid connection device (15); the slide rail (7) is provided on the outer surface of the tower (2) so that the curtain (12) surrounds the outside of the tower (2); the wing wall (1) and each tower (2) are provided with a winch (3), and the wire rope on the winch (3) is connected to the pulleys (6) on the main cable (10); multiple pulleys (6) on the same slide rail (7) are connected by ropes (14).

2. The enclosed reservoir stratified water intake device according to claim 1, characterized in that, One end of the wing wall (1) is connected to the side wall of the inlet (13), and the slide rail (7) is installed at the other end of the wing wall (1).

3. The enclosed reservoir stratified water intake device according to claim 1, characterized in that, The tower (2) is cylindrical; connecting beams (4) are provided between the top of the wing wall (1) and the tower (2), and between the tops of multiple towers (2).

4. The enclosed reservoir stratified water intake device according to claim 1, characterized in that, The sag-to-span ratio of the transverse cable (9) is smaller than that of the longitudinal cable (8).

5. A method for operating an enclosed reservoir stratified water intake device as described in any one of claims 1-4, characterized in that, include: When the reservoir is at its normal water level, the pontoon (5) drives the main cable (10) to be positioned on the water surface, so that the curtain (12) is positioned at a suitable water-blocking elevation, ensuring that the top of the curtain (12) has a certain flow height. As the water level drops, the draft of the pontoon (5) decreases, the buoyancy provided decreases, and the pontoon (5) near the wing wall (1) and the tower (2) drives the pulley (6) at the end of the main cable (10) to descend. The end pulley (6) drives the pulley (6) on each cross cable (9) to descend. The water-blocking elevation of the curtain (12) decreases as the water level drops, so that the curtain (12) folds between every two cross cables (9). The maximum distance that the curtain (12) bulges toward the inlet (13) is half the distance of the curtain (12) between the two cross cables (9). As the water level rises, the draft of the pontoon (5) increases, providing greater buoyancy. The pontoon (5) near the wing wall (1) and the tower (2) drives the pulley (6) at the end of the main cable (10) to rise. The end pulley (6) drives the pulley (6) on each cross cable (9) to rise, and together with the pontoon (5) on the main cable (10) rises, the entire curtain wall system rises. The water-blocking elevation of the curtain (12) increases with the rise of the water level.

6. The working method according to claim 5, characterized in that, The working program of the winch (3) is set. During the process of multiple pulleys (6) adapting to changes in water level, if the program determines that the sliding position of the pulley (6) deviates from the expected position, the winch (3) is started to adjust the sliding trajectory of the pulley (6).

7. The working method according to claim 5, characterized in that, The top horizontal cable (9) and the longitudinal cable (8) are connected by a flexible rope at the node (16). When the actual load carried by the curtain (12) is greater than the design load value, the flexible rope breaks actively. When the actual load carried by the curtain (12) is reduced to below the design load value, the curtain (12) is lifted and a new flexible rope is replaced.

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