Flexible waterproof curtain wall

Abstract

The invention provides a flexible waterproof curtain wall. The flexible waterproof curtain wall comprises a plurality of buoyancy tanks arranged at a water inlet, first longitudinal cables connected to the lower ends of the buoyancy tanks, a ground anchor arranged on a riverbed, a first traction cable, a second traction cable, a top main cable and a middle main cable, the top main cable and the middle main cable connect the first longitudinal cables respectively, and the first longitudinal cables are connected with the ground anchor. The two ends of the top main cable and the two ends of the middle main cable are connected with the dam body and the cable bent tower respectively, the middle main cable is located below the top main cable, the floating waterproof curtain is connected between the top main cable and the middle main cable, and the fixed waterproof curtain is connected between the middle main cable and the ground anchor. The first traction cable and the second traction cable are arranged on the side, close to the water inlet, of the floating waterproof curtain, the first traction cable is connected with the top main cable and the riverbed, and the second traction cable is connected with the middle main cable and the riverbed. The flexible structure is prevented from protruding towards the water inlet due to water level drop, and the safety risk of power generation of the water inlet is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of water environment treatment, in particular to a flexible water-blocking curtain wall. Background Art

[0002] Large and medium-sized hydropower projects with high dams and large reservoirs have large storage capacities and deep water depths, which can cause a certain degree of temporal and spatial variation in the water temperature of the original natural river channel. The water temperature within the reservoir typically forms vertical temperature stratification, with significant differences between the surface and bottom layers. Water diversion power generation systems typically use deep boreholes for water intake. Therefore, during certain periods, the discharged water temperature can differ significantly from the natural river channel. This temperature difference can have a certain degree of adverse impact on the downstream ecological environment.

[0003] In accordance with the "Design Specification for Stratified Intakes for Hydropower Stations" (NB / T 35053-2015), water conservancy and hydropower projects employ stratified water intake measures to control the water intake elevation of power stations and alleviate the problem of unevenly heated water discharge. Currently, measures used in medium- and large-scale hydropower projects include stoplog gates, pre-placed retaining walls, and water-blocking curtain walls. Of these, water-blocking curtain walls are currently the only stratified water intake measure applicable to existing power stations and hold great promise for future application.

[0004] The water-blocking curtain wall, constructed several hundred meters in front of the water inlet, is a river-blocking, 100-meter-span, waterproof, flexible structure. Compared to other measures such as stoplog gates and pre-installed retaining walls, it offers advantages such as improved water temperature recovery, convenient operation and scheduling, and the ability to operate in deep water. However, due to its river-blocking layout and its distance from the power station's water inlet, the water-blocking curtain wall has a large horizontal span and vertical depth, and intersects with the flood discharge channel and navigation channel. This presents challenges such as high construction difficulty, high project investment, and impacts on flood discharge and navigation.

[0005] Furthermore, existing stratified water intake measures struggle to balance water temperature recovery, impact on flood discharge and navigation, ease of operation and scheduling, and project investment friendliness. The industry has yet to come up with an effective solution to these issues.

[0006] Both ends of the main cables of the existing water-blocking curtain wall are connected to the cable towers on the river bank, resulting in a large curtain wall span, a large amount of engineering work, and high investment costs.

[0007] In addition, regarding the professional terms mentioned in this case, those skilled in the art generally identify them as follows:

[0008] The inlet floor plate is a crucial component of the water intake structure in a water conservancy project. Typically located at the base of the inlet, it supports the superstructure, controls water flow, and ensures structural stability. It serves as the connecting component between the inlet and the foundation, and its design and construction quality directly impact the safety and proper operation of the entire inlet and, ultimately, the water conservancy project. Summary of the Invention

[0009] The object of the present invention is to provide a flexible water-retaining curtain wall which is connected to a cable tower at one end and to a part of a dam body at the other end, thereby reducing the span and achieving a better water temperature recovery effect.

[0010] The technical solution of the present invention is: a flexible water-proof curtain wall, comprising a plurality of pontoons arranged along a water inlet, a first longitudinal cable connected to the lower end of each of the pontoons, a ground anchor provided on the riverbed, a first traction cable, a second traction cable, a top main cable and a middle main cable respectively connecting the plurality of the first longitudinal cables, the first longitudinal cable being connected to the ground anchor, the two ends of the top main cable and the middle main cable being connected to the dam body and the cable tower respectively, the middle main cable being located below the top main cable, a floating water-proof curtain being connected between the top main cable and the middle main cable, a fixed water-proof curtain being connected between the middle main cable and the ground anchor, the first traction cable and the second traction cable being provided on the side of the floating water-proof curtain close to the water inlet, the first traction cable connecting the top main cable and the riverbed, and the second traction cable connecting the middle main cable and the riverbed.

[0011] The above scheme adopts a double-layer flexible structure in which a floating waterproof curtain is connected to a fixed waterproof curtain and its structural deformation is controlled by a traction cable. Compared with the existing single-layer flexible structure, it can reduce its downstream deformation variable, avoid the flexible structure protruding outward from the water inlet due to the drop in water level, reduce the safety risk of power generation at the water inlet, and has the advantages of good water temperature recovery effect; in addition, the top main cable and the middle main cable are connected to the cable tower and the dam body respectively, which can realize the partial enclosed structure of the water inlet, so that the horizontal span and longitudinal depth are smaller, the engineering volume is smaller, and the overall construction investment of the project is lower.

[0012] Preferably, the riverbed is provided with a plurality of first hinged devices and a plurality of second hinged devices, the direction of the top main cable forms the curtain axis, the connection line of the plurality of second hinged devices forms the first anchor axis, the connection line of the plurality of first hinged devices forms the second anchor axis, the curtain axis, the first anchor axis and the second anchor axis are parallel, and the first anchor axis is located between the curtain axis and the second anchor axis; the first traction cable is connected to the first hinged device, and the second traction cable is connected to the second hinged device.

[0013] Preferably, the first hinge device and the second hinge device both have a hinge degree of freedom that can rotate, so that the first traction rope and the second traction rope can rotate by a certain angle.

[0014] Preferably, the first traction rope is connected to the intersection of the first longitudinal rope and the top main cable, and two first traction ropes in an inverted V shape are provided on each first longitudinal rope, and two adjacent first traction ropes are cross-arranged;

[0015] The second traction rope is connected to the intersection of the first longitudinal rope and the middle main cable. Two inverted V-shaped second traction ropes are arranged on each first longitudinal rope, and the two adjacent second traction ropes are arranged crosswise.

[0016] Preferably, the floating water-blocking curtain and the fixed water-blocking curtain are both provided with a plurality of second longitudinal cables and transverse cables interwoven horizontally and vertically to form a plurality of grids, a plurality of the second longitudinal cables are connected to the top main cable and the middle main cable, and a plurality of the transverse cables are connected to the first longitudinal cables.

[0017] Preferably, the length of the transverse cable between the first longitudinal cable and the second longitudinal cable and the length of the transverse cable between two adjacent second longitudinal cables are both greater than the plane projection length of a single grid.

[0018] Preferably, the exterior of the middle main cable is wrapped with a wrapping layer capable of generating buoyancy; and the exterior of the top main cable is wrapped with a protective layer.

[0019] Preferably, a flow gap is provided between the top main cable and the buoyancy box.

[0020] Preferably, the dam body and the cable tower are both provided with sliding devices capable of outputting vertical degrees of freedom, and the top main cable is connected to the sliding devices;

[0021] The middle main cable is anchored to the dam body and the cable tower, and the anchoring point of the anchoring connection is lower than the bottom plate of the water inlet.

[0022] Preferably, the top main cable and the middle main cable are both high-strength steel wire bundles.

[0023] Compared with the related art, the present invention has the following beneficial effects:

[0024] First, the present invention utilizes a double-layer flexible structure that connects a floating water-blocking curtain with a fixed water-blocking curtain, and whose structural deformation is controlled by a traction rope. Compared with existing single-layer flexible structures, this structure can reduce its downstream deformation, prevent the flexible structure from protruding outward from the water inlet due to water level drop, reduce the safety risk of power generation at the water inlet, and has advantages such as good water temperature recovery effect.

[0025] Second, the flexible water-blocking curtain wall of the present invention is designed and constructed independently from the water inlet, without modifying the water inlet structure, and has little impact on the flow field and flow pattern in the water inlet water pipe, and does not affect the normal operation and power generation of the unit;

[0026] 3. The present invention is constructed tens of meters in front of the water inlet, and the construction location does not intersect with the flood discharge channel and the navigation channel, avoiding the flood discharge area and the navigation channel area, and does not affect the normal flood discharge of the reservoir and the navigation channel;

[0027] Fourth, the floating water curtain of the present invention can adaptively adjust the surface high-temperature water intake depth as the water level fluctuates under the drive of the pontoon. The main project is close to the water inlet, which has a good effect on the temperature recovery of the downstream water and is convenient for operation and scheduling.

[0028] 5. The flexible waterproof curtain wall operates underwater for a long period of time, and its main components use metal mechanical structures (such as the top main cable and the middle main cable are high-strength steel wire bundles), with less use of electronic and electrical equipment. It is easy to maintain during operation, has a low failure rate, and low maintenance costs;

[0029] 6. The present invention partially surrounds the water inlet, and the horizontal span and vertical depth are both small, the engineering workload is small, and the overall construction investment of the project is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of the planar layout of the flexible water-blocking curtain wall provided by the present invention;

[0031] Figure 2 A schematic elevation diagram of the flexible water-blocking curtain wall provided by the present invention;

[0032] Figure 3 A schematic diagram of the flexible water-blocking curtain wall provided by the present invention at a normal water storage level;

[0033] Figure 4 This is a schematic diagram of the flexible waterproof curtain wall provided by the present invention at the dead water level.

[0034] In the attached figure: 1. pontoon; 2. top main cable; 3. floating water-blocking curtain; 4. fixed water-blocking curtain; 5. middle main cable; 6. wrapping layer; 7. first longitudinal cable; 8. transverse cable; 9. first traction cable; 10. ground anchor; 11. first hinged device; 12. second longitudinal cable; 13. dam body; 14. cable tower; 15. second traction cable; 16. second hinged device; 17. curtain axis; 18. first ground anchor axis; 19. second ground anchor axis; 20. flow gap. DETAILED DESCRIPTION

[0035] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments. It should be noted that the embodiments and features of the embodiments may be combined unless they conflict. For ease of description, the words "upper," "lower," "left," and "right" appear below merely to indicate the directions of upper, lower, left, and right in the accompanying drawings and do not limit the structure.

[0036] like Figure 1 、 Figure 2As shown, the flexible waterproof curtain wall provided in this embodiment includes a pontoon 1, a top main cable 2, a floating waterproof curtain 3, a fixed waterproof curtain 4, a middle main cable 5, a wrapping layer 6, a first longitudinal cable 7, a transverse cable 8, a first traction cable 9, a ground anchor 10, a first hinge device 11, a second longitudinal cable 12, a second traction cable 15 and a second hinge device 16.

[0037] The buoyancy chamber 1 is constructed from a high-strength, corrosion-resistant metal shell and filled with lightweight, corrosion-resistant foam. The buoyancy chamber 1 can adjust the cable net configuration according to the water level. Multiple buoyancy chambers 1 are provided, arranged along the water inlet. A first longitudinal cable 7 is connected to the lower end of each buoyancy chamber 1. The ground anchor 10 is anchored to the riverbed.

[0038] The top main cables 2 and the middle main cables 5 are connected between the plurality of first longitudinal cables 7. The ends of the top main cables 2 and the middle main cables 5 are connected to the dam body 13 and the cable tower 14, respectively. The middle main cables 5 are located below the top main cables 2. Both the dam body 13 and the cable tower 14 are equipped with sliding devices (not shown) capable of outputting vertical degrees of freedom. The top main cables 2 are connected to these sliding devices. The sliding devices include vertically extending chutes and sliding connectors that slide within the chutes. The chutes are provided on the dam body 13 or the cable tower 14, and the sliding connectors are connected to the top main cables 2. The sliding connectors are equipped with buoys, allowing the top main cables 2 to rise and fall with the water level.

[0039] A flow gap 20 of 5m-10m is maintained between the top main cable 2 and the buoyancy box 1 to ensure sufficient flow capacity.

[0040] The central main cable 5 is anchored to the dam body 13 and the tower 14, with the anchor point below the water inlet floor. The central main cable 5 forms a cable net limiting structure made of high-strength steel wire bundles, covered with a protective layer and a buoyant wrapping layer 6.

[0041] A floating water-blocking curtain 3 is connected between the top main cable 2 and the middle main cable 5, and a fixed water-blocking curtain 4 is connected between the middle main cable 5 and the ground anchor 10. The first traction rope 9 and the second traction rope 15 are arranged on the floating water-blocking curtain 3 near the water inlet side. The first traction rope 9 connects the top main cable 2 and the riverbed, and the second traction rope 15 connects the middle main cable 5 and the riverbed.

[0042] The riverbed is anchored with multiple first hinges 11 and multiple second hinges 16. The path of the top main cable 2 forms a curtain axis 17, the line connecting the multiple second hinges 16 forms a first anchor axis 18, and the line connecting the multiple first hinges 11 forms a second anchor axis 19. The curtain axis 17, the first anchor axis 18, and the second anchor axis 19 are parallel, with the first anchor axis 18 located between the curtain axis 17 and the second anchor axis 19. The first traction cable 9 is connected to the first hinge 11, and the second traction cable 15 is connected to the second hinge 16. Both the first hinge 11 and the second hinge 16 have a degree of freedom of rotation, allowing the first traction cable 9 and the second traction cable 15 to rotate to a certain angle to prevent shear damage to the traction cables.

[0043] The first traction rope 9 is connected to the intersection of the first longitudinal rope 7 and the top main cable 2. Two inverted V-shaped first traction ropes 9 are arranged on each first longitudinal rope 7, and two adjacent first traction ropes 9 are arranged crosswise.

[0044] The second traction rope 15 is connected to the intersection of the first longitudinal rope 7 and the middle main cable 5. Two inverted V-shaped second traction ropes 15 are set on each first longitudinal rope 7, and the two adjacent second traction ropes 15 are cross-arranged to prevent a single traction rope from being damaged by tension.

[0045] Under the action of the buoyancy of the wrapping layer 6 and the traction force of the second traction rope 15, it is ensured that the middle main cable 5 is relatively stable and does not change with the rise and fall of the water level.

[0046] The floating waterproof curtain 3 and the fixed waterproof curtain 4 are both provided with a plurality of second longitudinal cables 12 and transverse cables 8 that are interwoven horizontally and vertically to form a plurality of grids. A plurality of the second longitudinal cables 12 are connected to the top main cable 2 and the middle main cable 5, and a plurality of the transverse cables 8 are connected to the first longitudinal cables 7. The first longitudinal cables 7, the second longitudinal cables 12 and the transverse cables 8 are high-strength composite carbon fiber ropes, which are connected to the top main cable 2 and the middle main cable 5 to form a cable net. The spacing and number of the first longitudinal cables 7 and the second longitudinal cables 12 are designed according to the structural requirements. The floating waterproof curtain 3 and the fixed waterproof curtain 4 are made of waterproof, high-load-bearing flexible cloth, which bears load and stress through the cable net. The floating waterproof curtain 3 can change its cable net shape (such as Figure 3 、 Figure 4 The fixed water-blocking curtain 4 does not change with the rise and fall of the water level.

[0047] The length of the transverse cables 8 between the first longitudinal cables 7 and the second longitudinal cables 12, as well as the length of the transverse cables 8 between two adjacent second longitudinal cables 12, is greater than the planar projection length of a single grid. This allows for the formation of a catenary when impacted by water. The spacing and number of transverse cables 8 are designed based on the load-bearing capacity to ensure structural safety.

[0048] Example

[0049] A low-temperature water treatment project at a hydropower station. After the reservoir was filled, significant temperature stratification occurred within the reservoir area. This resulted in lower-than-natural water temperatures in spring and summer, negatively impacting the spawning and reproduction of downstream fish. To ensure optimal water temperatures for fish during the spawning season, a stratified water intake system was constructed upstream of the power station's water intake to raise the temperature of the downstream water.

[0050] The top main cable 2 is tensioned and connected to the terrain at both ends. It is made of high-strength steel wire bundle with a diameter of about 0.3m. It is wrapped with a flexible plastic protective layer, and the protective layer is covered with an aluminum sheath. After wrapping, the main cable diameter is 0.5m.

[0051] The middle main cable 5 is tensionedly connected to the terrain at both ends. It is made of high-strength steel wire bundle with a diameter of about 0.3m. It is wrapped with a flexible plastic protective layer and a buoyant wrapping layer 6. The wrapping layer 6 is covered with an aluminum sheath. After wrapping, the diameter of the main cable is 1m.

[0052] The bottom of the first longitudinal cable 7 is connected to the ground anchor 10, the middle of the first longitudinal cable 7 is connected to the middle main cable 5, the top of the first longitudinal cable 7 is connected to the top main cable 2, and the topmost part of the first longitudinal cable 7 is connected to the buoyancy tank 1. The first longitudinal cable 7 is made of high-strength composite carbon fiber rope with a breaking elongation of 6%-10% and a diameter of approximately 0.1m. The first longitudinal cable 7 is connected to the top main cable 2 and the middle main cable 5 to adjust the shape of the cable net.

[0053] The ends of the transverse cables 8 are cross-connected with the first longitudinal cables 7 and the second longitudinal cables 12 to form a cable net structure. The transverse cables 8 are made of high-strength composite carbon fiber ropes with a breaking elongation of 6%-10% and a diameter of about 0.15m, and are the main load-bearing structure.

[0054] The floating waterproof curtain 3 and the fixed waterproof curtain 4 are flexible water-retaining structures, made of waterproof and high-load-bearing flexible cloth with a breaking elongation of 15%-20% and a thickness of about 6 mm.

[0055] The first traction rope 9 and the second traction rope 15 have a material elongation at break of less than 2%, a diameter of about 0.3 m, a cable net limiting structure, and a cross connection.

[0056] The shell of the pontoon 1 is made of high-strength anti-corrosion metal, and the interior is filled with lightweight corrosion-resistant foam. The length × width × height are approximately 3m × 1.5m × 0.5m, and the flat surface faces the water.

[0057] According to numerical simulation and analysis, the flexible waterproof curtain wall bears a total load of 1517t and a maximum flow velocity of about 1.42m / s.

[0058] According to numerical simulation and analysis, the implementation of this device can increase the downstream water temperature during the spring fish spawning period in May from 19.3°C to 23.8°C. It can be seen that this embodiment has a very good effect in improving the downstream water temperature and has significant promotion value.

[0059] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention's description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A flexible water-blocking curtain wall, comprising a plurality of pontoons (1) arranged along a water inlet, a first longitudinal cable (7) connected to the lower end of each of the pontoons (1), and a ground anchor (10) provided on a riverbed, wherein the first longitudinal cable (7) is connected to the ground anchor (10), and characterized in that: The invention also includes a first traction cable (9), a second traction cable (15), a top main cable (2) and a middle main cable (5) respectively connecting a plurality of the first longitudinal cables (7); the ends of the top main cable (2) and the middle main cable (5) are respectively connected to the dam body (13) and the cable tower (14); the middle main cable (5) is located below the top main cable (2); a floating waterproof curtain (3) is connected between the top main cable (2) and the middle main cable (5); a fixed waterproof curtain (4) is connected between the middle main cable (5) and the ground anchor (10); the first traction cable (9) and the second traction cable (15) are arranged on the side of the floating waterproof curtain (3) close to the water inlet; the first traction cable (9) connects the top main cable (2) and the riverbed; the second traction cable (15) connects the middle main cable (5) and the riverbed.

2. The flexible waterproof curtain wall according to claim 1, characterized in that: The riverbed is provided with a plurality of first hinged devices (11) and a plurality of second hinged devices (16); the direction of the top main cable (2) forms a curtain axis (17); the connection line of the plurality of second hinged devices (16) forms a first anchor axis (18); the connection line of the plurality of first hinged devices (11) forms a second anchor axis (19); the curtain axis (17), the first anchor axis (18) and the second anchor axis (19) are parallel, and the first anchor axis (18) is located between the curtain axis (17) and the second anchor axis (19); the first traction rope (9) is connected to the first hinged device (11), and the second traction rope (15) is connected to the second hinged device (16).

3. The flexible waterproof curtain wall according to claim 2, characterized in that: The first hinge device (11) and the second hinge device (16) both have a hinged degree of freedom capable of rotation, so that the first traction rope (9) and the second traction rope (15) can rotate at a certain angle.

4. The flexible waterproof curtain wall according to claim 1, characterized in that: The first traction rope (9) is connected to the intersection of the first longitudinal rope (7) and the top main cable (2), and two first traction ropes (9) in an inverted V shape are arranged on each first longitudinal rope (7), and the two adjacent first traction ropes (9) are arranged crosswise; The second traction rope (15) is connected to the intersection of the first longitudinal rope (7) and the middle main cable (5), and two inverted V-shaped second traction ropes (15) are arranged on each first longitudinal rope (7), and the two adjacent second traction ropes (15) are cross-arranged.

5. The flexible waterproof curtain wall according to claim 1, characterized in that: The floating water-blocking curtain (3) and the fixed water-blocking curtain (4) are both provided with a plurality of second longitudinal cables (12) and transverse cables (8) interwoven horizontally and vertically to form a plurality of grids, a plurality of the second longitudinal cables (12) are connected to the top main cable (2) and the middle main cable (5), and a plurality of the transverse cables (8) are connected to the first longitudinal cables (7).

6. The flexible waterproof curtain wall according to claim 5, characterized in that: The length of the transverse cable (8) between the first longitudinal cable (7) and the second longitudinal cable (12) and the length of the transverse cable (8) between two adjacent second longitudinal cables (12) are both greater than the plane projection length of a single grid.

7. The flexible waterproof curtain wall according to claim 1, characterized in that: The exterior of the middle main cable (5) is coated with a wrapping layer (6) capable of generating buoyancy; and the exterior of the top main cable (2) is coated with a protective layer.

8. The flexible waterproof curtain wall according to claim 1, characterized in that: A flow gap (20) is provided between the top main cable (2) and the buoyancy box (1).

9. The flexible waterproof curtain wall according to claim 1, characterized in that: The dam body (13) and the cable tower (14) are both provided with sliding devices capable of outputting vertical degrees of freedom, and the top main cable (2) is connected to the sliding devices; The middle main cable (5) is anchored to the dam body (13) and the cable tower (14), and the anchoring point of the anchoring connection is lower than the water inlet bottom plate.

10. The flexible waterproof curtain wall according to claim 1, characterized in that: The top main cable (2) and the middle main cable (5) are both high-strength steel wire bundles.

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