A modularly designed river bridge pier scour prevention device

Abstract

The application discloses a modularly designed river bridge pier anti-scouring device, which comprises a fixing ring sleeved on the outer ring of a bridge pier body, a pier front baffle is arranged on the front side of the fixing ring, flow guide grooves are arranged on the left side and the right side of the fixing ring, the front ends of the two flow guide grooves are respectively rotationally connected to the rear ends of the two sides of the pier front baffle, and compression springs are connected between the flow guide grooves and the fixing ring. The modularly designed river bridge pier anti-scouring device can reduce the local scouring degree of the bridge pier foundation, improve the safety performance of the bridge foundation and improve the durability of the protection device.

Description

Technical Field

[0001] This invention relates to a modularly designed anti-scouring device for river bridge piers, belonging to the field of river protection technology. Background Technology

[0002] Bridge piers, situated in river channels, alter the surrounding flow field, generating downward jets in front of the piers, horseshoe vortices, and wake vortices behind them. Under the scouring effect of these vortices, scour pits appear near the pier foundations, reducing the effective embedment depth of the piles, lowering the bearing capacity, and jeopardizing the safe operation of the bridge. Currently, scour protection measures are mainly divided into active protection (altering water flow characteristics and disrupting vortices to reduce scour depth) and passive protection (laying protective layers to protect the underlying layers from scour). Active protection measures include protective rings, baffles, pier joints, and piles in front of the piers; passive protection measures include laying protective layers, riprap protection, and enlarged foundations.

[0003] In active protection measures, the presence of silt or rocks in the river flow can damage the anti-scouring devices required for active protection, reducing their protective effectiveness. Furthermore, these devices are located underwater, making maintenance difficult. Therefore, improving the durability of anti-scouring devices has become a pressing issue. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a modular design for a river pier anti-scour device, which can reduce the degree of local scour of the pier foundation, improve the safety performance of the bridge foundation and enhance the durability of the protective device.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0006] A modular design for a river pier anti-scouring device includes a fixing ring fitted around the outer ring of the pier body. A front baffle that fits against the front of the fixing ring is provided. A flow guide groove is provided on the left and right sides of the fixing ring. The front ends of the two flow guide grooves are rotatably connected to the rear ends of the front baffle. A compression spring is connected between the flow guide groove and the fixing ring.

[0007] The inner side of the front baffle of the pier is provided with a square protrusion, and the outer ring of the fixing ring is provided with a reserved slot. The square protrusion extends into the reserved slot and is then fastened by bolts.

[0008] The interface widths on both sides of the rear end of the front baffle are the same as the interface width at the front end of the guide channel. Semi-circular protrusions are provided on both sides of the rear end of the front baffle, and a semi-circular recessed interface is provided at the front end of the guide channel. The semi-circular protrusions and the semi-circular recessed interface are connected by a pin.

[0009] When the compression spring is not under force, the guide channel and the main body of the bridge pier form a 5° angle in the horizontal direction.

[0010] The guide channel forms a 10° angle with the main body of the bridge pier in the vertical direction.

[0011] The front baffle of the pier is a concave steel plate, the surface of the front baffle is coated with an anti-rust and hydrophobic coating, and the surface of the front baffle is provided with a number of triangular protrusions.

[0012] The number of compression springs on a single guide groove is two, which are respectively installed at 1 / 3 and 2 / 3 of the length of the guide groove.

[0013] A rubber layer is placed between the fixing ring and the main body of the bridge pier.

[0014] The compression spring is wrapped with a flexible polyethylene material layer on the outside.

[0015] The water-facing surface of the pier front baffle is covered with a rubber layer.

[0016] The beneficial effects of this invention are as follows: This invention provides a modular design for a river pier anti-scour device. A front baffle is installed in front of the pier body. The front baffle can effectively reduce the scour of the downward jet and horseshoe vortex on the foundation near the pier. The rough particles on the surface of the front baffle can also play a role in energy dissipation. After the front baffle weakens the downward jet, the water flow can be diffused to an area away from the pier through the two-wing guide channels, which can effectively reduce the scour of the tail vortex on the pier foundation. The rubber block placed at the connection between the front baffle and the pier body can effectively reduce the damage that the water flow may cause to the pier body and the pier baffle. The two-wing guide channels are connected to the front baffle by pins and to the fixing ring by springs. At different flow rates, pressure changes can cause the compression spring to expand or contract, thereby changing the angle between the guide channel and the main body of the pier. This prevents the guide channel from being damaged at high flow rates, improves the durability of the guide channel, or facilitates replacement and maintenance if damage has already occurred. The anti-scouring device adopts a modular design for each part, which allows for quick replacement of damaged parts, reduces maintenance difficulty, and improves the efficiency of device maintenance. Attached Figure Description

[0017] Figure 1 This is a top view schematic diagram of a modular design anti-scouring device for river bridge piers according to the present invention.

[0018] Figure 2 This is a front view schematic diagram of a modularly designed anti-scouring device for river bridge piers according to the present invention.

[0019] Figure 3 for Figure 2 A schematic diagram of the enlarged middle section.

[0020] The attached diagram is labeled as follows: 1-Fixing ring; 2-Pier front baffle; 3-Guide channel; 4-Compression spring; 5-Pier body. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present invention more clearly, and should not be used to limit the scope of protection of the present invention.

[0022] like Figures 1 to 3 As shown, this invention discloses a modularly designed anti-scour device for river bridge piers, which is installed at a depth of 1 / 3 from the riverbed. The anti-scour device mainly includes a fixing ring 1 fitted around the outer ring of the pier body 5. A front baffle 2 is provided on the front side of the fixing ring 1 and fits therewith. Flow guide channels 3 are provided on the left and right sides of the fixing ring 1. The front ends of the two flow guide channels 3 are rotatably connected to the rear ends of the front baffle 2, respectively. A compression spring 4 is connected between the flow guide channels 3 and the fixing ring 1.

[0023] The main body of the bridge pier 1 is round-ended, meaning that the two ends are semi-circular structures along the direction of water flow, and the middle is rectangular.

[0024] The pier front baffle 2 is a concave steel plate with a rust-proof and hydrophobic coating. Its upper surface is uneven and has many triangular protrusions. The pier front baffle 2 should have a pre-set square protrusion that connects to the fixing ring 1. It can be embedded in the reserved slot on the fixing ring 1 and fastened with bolts.

[0025] The front water-facing surface of the pier front baffle 2 should be covered with a rubber layer. The width of the interfaces on both sides of the rear end of the pier front baffle 2 should be the same as the width of the front interface of the guide channel 3, and a semi-circular protruding connecting part should be pre-set. The diameter of the semi-circle should be the same as the width of the guide channel 3, and a connecting hole should be left on it.

[0026] The guide channel 3 is a polyethylene composite material plate with a hydrophobic coating on its surface. A semi-circular recessed interface is reserved at the front end of the channel, which is connected to the front baffle 2 of the pier by a pin.

[0027] When the diversion channel 3 is installed, it forms a 10° angle with the length direction of the main body 5 of the pier and a 5° angle with the vertical direction of the main body 5 of the pier. It can be dynamically adjusted by the deformation of the spring under the action of water flow force. The diversion channel 3 should be equipped with a spring interface in advance to facilitate connection with the fixing ring 1.

[0028] The fixing ring 1 is a high-performance steel plate with an anti-corrosion and waterproof coating on its surface. It is arranged around the pier and fixed with bolts. When installing the fixing ring 1, a rubber layer should be placed between the fixing ring 1 and the pier body 5. The fixing ring 1 should have a pre-reserved slot and spring interface to facilitate connection with the pier front baffle 2 and the guide channel 3.

[0029] The compression spring 4 is a cylindrical compression spring with pre-drilled round buckle-shaped interfaces at both ends for easy connection with the guide channel 3 and the fixing ring 1; the compression spring 4 should be wrapped with a layer of flexible polyethylene material to protect the spring from water flow erosion and improve durability; the spring should be installed at 1 / 3 or 2 / 3 of the distance from the connection point.

[0030] The length of the front baffle 2 in the direction of water flow shall not be less than 0.3 times the diameter of the semi-circular structure of the main body of the pier 1, and the width perpendicular to the direction of water flow shall be at least greater than the sum of the diameter of the semi-circular structure and twice the width of the guide channel 3, and the thickness shall not be less than 0.01m; the width at the connection between the end of the front baffle 2 and the guide channel shall be consistent with the width of the guide channel; the thickness of the rubber layer on the water-facing side of the front baffle shall not be less than 0.01m;

[0031] Specifically, the length of the guide channel 3 shall not be less than 1.1 times the sum of the length of the rectangle and the radius of the semicircular structure; the width of the guide channel 3 shall not be less than 0.2 times the diameter of the semicircular structure.

[0032] Specifically, the thickness of the steel plate of the fixing ring 1 should be no less than 0.01m, and its length perpendicular to the water flow direction should be greater than the thickness of the front baffle 2 of the pier, i.e., greater than 0.01m.

[0033] Specifically, when the compression spring 4 is initially installed, that is, when the angle between the guide channel 3 and the main body of the pier 5 is 5°, the compression amount is 0; when the compression amount of the compression spring 4 reaches its maximum, the guide channel and the pier should maintain an angle of 1°.

[0034] Assuming the diameter of the semi-circular structure of the main body 1 of the bridge pier is D, then the short side b of the rectangular structure is D, and the long side a of the rectangular structure is M. Then the length of the front baffle 2 in the direction of water flow is not less than 0.3D, and the length perpendicular to the direction of water flow is not less than (D+2(1.1(M+D / 2))); the length of the guide channel 3 is not less than 1.1+d / 2, and the length of the fixing ring 1 is not less than (π(D+0.02)+2M).

[0035] The working principle of this invention is as follows: The front baffle 2 is arranged at a certain angle to the water flow direction, guiding the water flow in front of the pier and the downward jet water flow in front of the pier to form turbulence on the surface of the front baffle 2. Part of the energy is dissipated by the particles on the surface of the baffle, effectively weakening the strength of the front horseshoe vortex and reducing the scour depth in front of the pier. After energy dissipation, the turbulence at the baffle can flow along the guide channel 3 to a distance from the backwater surface of the pier body 5 under the action of the water flow, which can effectively reduce the strength of the tail vortex behind the pier and reduce the scour depth behind the pier. Since the guide channel 3 is under the action of the compression spring 4, the angle between it and the pier body 5 can be changed at different flow velocities by changing the compression amount of the compression spring 4, avoiding damage to the guide channel when the flow velocity is high and improving the durability of the device.

[0036] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A modularly designed anti-scouring device for river bridge piers, characterized in that: The structure includes a fixing ring (1) fitted around the outer ring of the pier body (5). A front baffle (2) is provided on the front side of the fixing ring (1) and fits therewith. A guide groove (3) is provided on the left and right sides of the fixing ring (1). The front ends of the two guide grooves (3) are rotatably connected to the rear ends of the front baffle (2). A compression spring (4) is connected between the guide groove (3) and the fixing ring (1). When the compression spring (4) is not under force, the guide groove (3) and the pier body (5) form a 5° angle in the horizontal direction and a 10° angle in the vertical direction. The front baffle (2) is a concave steel plate. The surface of the front baffle is coated with an anti-rust and hydrophobic coating. Several triangular protrusions are provided on the surface of the front baffle.

2. The modular design of the anti-scouring device for river bridge piers according to claim 1, characterized in that: The inner side of the front baffle (2) of the pier is provided with a square protrusion, and the outer ring of the fixing ring (1) is provided with a reserved slot. The square protrusion extends into the reserved slot and is then fastened by bolts.

3. The modular design of the anti-scouring device for river bridge piers according to claim 1, characterized in that: The interface widths on both sides of the rear end of the front baffle (2) are the same as the interface widths at the front end of the guide channel (3). The front baffle (2) has semi-circular protrusions on both sides of the rear end, and the guide channel (3) has a semi-circular recessed interface at the front end. The semi-circular protrusions and the semi-circular recessed interfaces are connected by a pin.

4. The modular design of the anti-scouring device for river bridge piers according to claim 1, characterized in that: The number of compression springs (4) on a single guide groove (3) is 2, which are respectively installed at 1 / 3 and 2 / 3 of the length of the guide groove (3).

5. The modular design of the anti-scouring device for river bridge piers according to claim 1, characterized in that: A rubber layer is placed between the fixing ring (1) and the pier body (5).

6. The modular design of the anti-scouring device for river bridge piers according to claim 1, characterized in that: The compression spring (4) is wrapped with a flexible polyethylene material layer on the outside.

7. The modular design of the anti-scouring device for river bridge piers according to claim 1, characterized in that: The water-facing surface of the pier front baffle (2) is covered with a rubber layer.

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