Emergency scour protection for embankments

Abstract

The utility model discloses a kind of emergency anti-scouring baffle of embankment, belong to hydraulic engineering emergency rescue equipment technical field;The device includes main body frame, airfoil guide vane, pivot, torsion spring system, damper and spiral anchoring system, the airfoil guide vane is hinged in frame by pivot, and its pivot is set at the place close to the leading edge of guide vane;Torsion spring system provides the moment of making guide vane fold, the pressure difference generated in water flow is used to drive guide vane self-adapting rotation to spread, the greater the flow velocity, the greater the opening angle, to intelligently guide mainstream to river channel center, and promote silt vortex at dam foot, the utility model does not need external power, self-adaptability is strong, response is fast, modular design is convenient for transportation and rapid deployment, can effectively protect embankment foot from scouring, greatly improve the efficiency and reliability of emergency rescue.

Description

Technical Field

[0001] This utility model relates to the field of construction, and more particularly to emergency rescue equipment for water conservancy projects, especially an emergency erosion protection baffle for dams. Background Technology

[0002] The toe of the slope of dikes and riverbank protection is the part most severely eroded by water flow. Especially during the flood season, the high-speed water flow directly erodes the toe of the slope, which can easily lead to the loss of foundation soil and cause catastrophic accidents such as collapse and dam failure. Therefore, emergency erosion protection of the slope toe is the top priority of flood control and disaster relief work.

[0003] Currently, common emergency scour prevention measures mainly include throwing sandbags, stones, gabion nets, and concrete blocks. Although these methods use readily available materials, they have obvious drawbacks: 1) low efficiency, relying entirely on manual labor, resulting in slow rescue speed; 2) high material consumption, with materials that are basically non-recyclable; 3) passive protection effect, unable to intelligently respond to changes in water flow; 4) large quantities of thrown materials may alter the riverbed morphology, creating new problems. Therefore, there is an urgent need for an intelligent emergency protection device that can adapt to water flow conditions, efficiently divert and dissipate energy, and is easy to deploy and recover quickly. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model aims to provide an emergency scour protection baffle for dams. This device utilizes the principles of fluid mechanics and can automatically adjust the angle of the guide plate according to the water flow velocity without external power, thereby achieving intelligent and efficient flow guidance and siltation promotion, effectively protecting the safety of dams, and possessing the advantages of rapid deployment and recyclability.

[0005] To achieve the above objectives, this utility model provides an emergency scour control baffle for dams, comprising a main frame, a guide plate, a rotating shaft, a torsional elastic element, a damping element, and an anchoring assembly. The guide plate has an asymmetrical airfoil cross-section, including an arc-shaped convex surface and a flat surface. The guide plate is hinged to the main frame via the rotating shaft, with the axis of the rotating shaft located 25%-30% of the chord length behind the leading edge of the guide plate. The torsional elastic element connects the rotating shaft to the main frame, providing an elastic torque that causes the guide plate to tend towards a contracted state. The damping element connects the rotating shaft to the main frame, suppressing the rotational oscillation of the guide plate. The anchoring assembly is located at the bottom of the main frame, fixing the entire device to the riverbed.

[0006] Furthermore, this utility model provides an emergency scour protection baffle for dams, wherein the torsional elastic element is a torsional spring.

[0007] Furthermore, this utility model provides an emergency scour protection baffle for dams, wherein the damping element is a rotary silicone oil damper.

[0008] Furthermore, this utility model provides an emergency scour protection baffle for dams, wherein the anchoring component is a detachable helical anchor, including an anchor rod and helical blades welded to the bottom of the anchor rod; the bottom of the main frame is provided with a guide sleeve for the anchor rod to pass through.

[0009] Furthermore, the present invention provides an emergency scour protection baffle for dams, wherein a composite sealing structure consisting of a double-lip oil seal and a V-shaped packing seal is provided between the rotating shaft and the main frame.

[0010] Furthermore, the present invention provides an emergency scour protection baffle for dams, which also includes a safety locking pin. In the transportation and storage state, the safety locking pin can fix the guide plate in a folded position parallel to the water flow direction.

[0011] Furthermore, this utility model provides an emergency scour protection baffle for dams, wherein the guide plate is molded from glass fiber reinforced polymer or carbon fiber composite material.

[0012] The emergency erosion prevention baffle for dams provided by this utility model has the following advantages compared with the prior art:

[0013] 1. Truly adaptive and intelligent: Driven by airfoil pressure difference, it is not a traditional water flow impact. The physical principle is correct and reliable. The deflector deployment angle increases with the flow velocity, realizing a completely passive intelligent response without the need for external energy and control system.

[0014] 2. Highly efficient flow guidance and siltation promotion: The deployed airfoil-shaped guide vanes can efficiently guide the main flow to the center of the river channel, away from the dam toe. At the same time, the low-speed vortex zone formed on its backwater surface can greatly promote the deposition of sediment, thus actively protecting the dam toe from both "blocking" and "dredging" aspects.

[0015] 3. Rapid deployment and recycling: The modular design, combined with mechanical interlocking mechanisms and helical anchors, allows for rapid installation and connection into formations via mechanical or manual methods. After the disaster relief operation, it can be easily recycled and reused, making it economical and environmentally friendly.

[0016] 4. High reliability and durability: No electronic components, pure mechanical structure, using corrosion-resistant materials, composite sealing and damping design, adaptable to harsh underwater environments, stable operation and long service life;

[0017] 5. High flexibility: It can adapt to the flow velocity characteristics of different rivers by adjusting the spring preload, and has a wide range of applications. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of an emergency scour protection baffle structure for dams according to the present invention;

[0019] Figure 2 This is an exploded view of an emergency scour protection baffle structure for dams according to this utility model.

[0020] The components include: 1. Main frame; 2. Guide plate; 3. Rotating shaft; 4. Safety lock pin; 5. Arc-shaped raised surface; 6. Flat surface; 7. Torsion spring; 8. Silicon oil damper; 9. Anchor bolt; 10. Spiral blade; 11. Guide sleeve. Detailed Implementation

[0021] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments and accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] like Figure 1 and Figure 2As shown in this embodiment, an emergency scour barrier for dams includes a main frame 1, a guide plate 2, a rotating shaft 3, a torsional elastic element, a damping element, an anchoring assembly, and a safety locking pin 4. The guide plate 2 has an asymmetrical airfoil cross-section and includes an arc-shaped convex surface 5 and a smooth surface 6. This design allows for a significant pressure differential force when water flows over its surface. The guide plate 2 is molded from glass fiber reinforced polymer or carbon fiber composite material, possessing lightweight, high strength, corrosion resistance, and wear resistance. The guide plate 2 is hinged to the main frame 1 via the rotating shaft 3. Crucially, the axis of the rotating shaft 3 is located 25%-30% of the chord length behind the leading edge of the guide plate 2. This non-centrally located rotating shaft 3 is the core for generating the opening torque, ensuring that the torque generated by the pressure differential force can overcome the resistance torque of the torsional elastic element. A double-lip oil seal and a V-type packing seal are installed between the rotating shaft 3 and the main frame 1. The sealed structure effectively prevents the intrusion of silt and water, ensuring the long-term reliable operation of the core rotating components. The torsional elastic element connects the rotating shaft 3 and the main frame 1, providing an elastic torque that causes the guide plate 2 to tend towards a retracted state. In this embodiment, the torsional elastic element is a torsional spring 7. The damping element connects the rotating shaft 3 and the main frame 1, suppressing the rotational oscillation of the guide plate 2 and improving structural stability and lifespan. In this embodiment, the damping element is a rotary silicone oil damper 8. The anchoring assembly is located at the bottom of the main frame 1, used to fix the entire device to the riverbed. In this embodiment, the anchoring assembly is a detachable helical anchor, including an anchor rod 9 and a helical blade 10 welded to the bottom of the anchor rod 9. The bottom of the main frame 1 is provided with a guide sleeve 11 through which the anchor rod 9 passes. In the transportation and storage state, the safety locking pin 4 can fix the guide plate 2 in a retracted position parallel to the water flow direction.

[0025] It should be noted that the rotary silicone oil damper 9 in this embodiment is prior art. A silicone oil damper, also known as a rotary viscous damper, has a core structure that can be imagined as a precisely sealed cavity filled with special silicone oil. The main components include:

[0026] Shell: Typically a sealed cylindrical or elliptical container that provides structural support and sealed space;

[0027] Shaft: Extends from inside the housing and is used to connect external mechanisms that require damping (such as our deflector shaft).

[0028] Blades: Fixed on the rotating shaft, they divide the interior of the housing into two or more chambers, and the gap between the blades and the interior of the housing is very small;

[0029] Silicone oil: a synthetic oil with high viscosity, high viscosity index (viscosity changes little with temperature), stable chemical properties, low compressibility and good lubrication. It is the core medium for energy dissipation.

[0030] Sealing system: An extremely important part, usually using high-performance lip seals or mechanical seals to ensure that silicone oil does not leak, while allowing the shaft to rotate with low friction;

[0031] The working principle of a silicone oil damper is based on fluid viscous resistance. When the guide vane attempts to rotate due to the impact of water flow, it drives the damper's shaft and blades to rotate. The movement of the blades squeezes the silicone oil in one chamber, forcing it to flow at high speed through the tiny gap between the blades and the shell, and flow to the other chamber. As a high-viscosity fluid, silicone oil generates huge shear resistance and friction when flowing through these tiny gaps. This process continuously converts the mechanical kinetic energy of the guide vane's oscillation into heat energy, which is then dissipated into the surrounding environment through the damper shell. Ultimately, the silicone oil damper does not provide the main restoring torque, but rather acts as an "energy consumer," smoothly suppressing and absorbing motion to prevent system instability. The restoring torque is achieved by a torsion spring.

[0032] In actual manufacturing, the main frame 1 is welded from high-strength aluminum alloy square tubing with internal reinforcing ribs. A guide plate 2 is hinged within the frame via bearings. This guide plate 2 is molded from glass fiber, with an airfoil-shaped cross-section and a chord length of 600mm. The axis of the rotating shaft 3 is located 150mm (25% chord length) behind the leading edge of the guide plate 2. One end of the rotating shaft 3 is equipped with a torsion spring 7 and a silicone oil damper 8. Guide sleeves 11 are welded to the four corners of the frame bottom, through which detachable spiral anchors pass. The spiral anchors are welded from anchor rods 9 and spiral blades 10 with a diameter of 350mm. The contact point between the rotating shaft 3 and the frame is equipped with a composite sealing structure consisting of a double-lip oil seal and a V-type packing seal. During transportation, the guide plate 2 is locked using a safety locking pin 4. During use, the safety pin 4 is removed. With the full locking pin 4, the device is placed at the toe of the dam slope, ensuring that the water flow impacts the leading edge of the guide plate 2 head-on. The auger is then rotated with a wrench to allow it to penetrate into the riverbed. At low flow rates, the guide plate 2 remains closed under the action of spring force. As the flow rate increases, the water flows around the airfoil, generating high pressure on the flat surface 6 and low pressure on the arc-shaped convex surface 5. This pressure difference generates a resultant force. Since the rotating shaft 3 is positioned forward, the resultant force generates a clockwise opening torque on the rotating shaft 3. When this torque is greater than the spring torque, the guide plate 2 begins to overcome the resistance of the damper and smoothly unfolds. The greater the flow rate, the greater the unfolding angle. The unfolded guide plate 2 directs the water flow to a distant location, preventing the water flow from scouring the dam. At the same time, the vortex area on the back side promotes siltation. After the flow rate decreases, the guide plate 2 automatically resets under the action of spring force.

[0033] Any aspects of this utility model not described in detail are well-known technologies to those skilled in the art.

[0034] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. An emergency scour protection baffle for a levee, characterized in that, The device includes a main frame (1), a guide plate (2), a rotating shaft (3), a torsional elastic element, a damping element, and an anchoring assembly. The guide plate (2) has an asymmetrical airfoil cross-section and includes an arc-shaped protruding surface (5) and a flat surface (6). The guide plate (2) is hinged to the main frame (1) via the rotating shaft (3), and the axis of the rotating shaft (3) is located 25%-30% of the chord length behind the leading edge of the guide plate (2). The torsional elastic element connects the rotating shaft (3) and the main frame (1) to provide an elastic torque that causes the guide plate (2) to tend towards a contracted state. The damping element connects the rotating shaft (3) and the main frame (1) to suppress the rotational oscillation of the guide plate (2). The anchoring assembly is located at the bottom of the main frame (1) to fix the entire device to the riverbed.

2. A scour protection barrier for use in an emergency situation in a dam according to claim 1, characterized in that The torsional elastic element is a torsional spring (7).

3. A scour protection barrier for use in an emergency situation in a dam according to claim 1, characterized in that The damping element is a rotary silicone oil damper (8).

4. A scour protection barrier for use in an emergency situation in a dam according to claim 1, characterized in that The anchoring assembly is a detachable helical anchor, including an anchor rod (9) and a helical blade (10) welded to the bottom of the anchor rod; the bottom of the main frame (1) is provided with a guide sleeve (11) through which the anchor rod (9) passes.

5. A scour protection barrier for use in an emergency situation in a dam according to claim 1, characterized in that A composite sealing structure consisting of a double-lip oil seal and a V-type packing seal is provided between the rotating shaft (3) and the main frame (1).

6. A scour protection barrier for use in an emergency situation in a dam according to claim 1, characterized in that It also includes a safety locking pin (4), which, in the transport and storage state, can fix the guide plate (2) in a folded position parallel to the water flow direction.

7. A scour protection barrier for use in an emergency situation in a dam according to claim 1, characterized in that The guide plate (2) is molded from glass fiber reinforced polymer or carbon fiber composite material.

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