Active anti-scouring device applied to circular pier

Abstract

The utility model relates to an active anti-scouring device applied to a circular pier. The active anti-scouring device comprises an outer plate and an inner plate, the inner plate and the outer plate are circular, the inner plate encloses the outer side of the circular pier, a plurality of axial steel bars protruding towards the direction of the circular pier are arranged on the inner side of the inner plate, and the axial steel bars are uniformly distributed and welded on the inner side of the inner plate; a connecting tie bar system is arranged between the inner plate and the outer plate and comprises an inner tie bar and an outer tie bar; a limiting box is welded to the outer side of the inner plate and connected with the inner tie bar. A limiting box is welded to the inner side of the outer plate and connected with the outer tie bar. Disturbing plates are welded on the outer side of the outer plate and comprise a front disturbing plate and a rear disturbing plate. The perturbation plate has the advantages that water flow is allowed to pass through the water permeable holes of the perturbation plate, normal flowing of the water flow is not affected, and impact force of the water flow on the pier column can be reduced; components are prefabricated in a factory, so that the workload and time of a construction site are reduced, and the construction efficiency is improved; the tie bar system is flexible in design, and the adaptability between the device and the pier column is ensured.

Description

Technical Field

[0001] This utility model relates to the field of bridge engineering protection, and in particular includes an active anti-scouring device for circular piers. Background Technology

[0002] In bridge engineering, circular piers are widely used due to their excellent hydraulic performance and structural stability. However, in aquatic environments such as rivers, circular piers are subjected to long-term scouring by water flow, especially the impact of flow around the pier and wake vortices, which easily leads to localized scouring and erosion of the pier foundation. This scouring not only weakens the load-bearing capacity of the pier but may also cause safety hazards to the bridge structure, seriously affecting the service life and operational safety of the bridge. Traditional anti-scouring measures have limited protective effects, only passively blocking water flow and failing to dissipate scouring energy; they have low construction efficiency, complex on-site operations, and are greatly affected by the environment; they have poor adaptability and are difficult to adjust according to water flow conditions; construction quality is difficult to guarantee and defects are prone to occur; and they have poor environmental performance and may damage the riverbed ecology. Therefore, the existing technology lacks a circular pier anti-scouring device and its construction method that can actively dissipate water flow energy, has high construction efficiency, strong adaptability, good environmental performance, and high economy. This utility model is proposed to solve the problems in the above-mentioned existing technology. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide an active anti-scouring device for circular piers.

[0004] This active anti-scour device for circular piers includes: an outer plate and an inner plate; the inner and outer plates are circular, with the inner plate surrounding the outer side of the circular pier. Multiple axial reinforcing bars protruding towards the circular pier are evenly distributed and welded to the inner side of the inner plate. A connecting rod system is provided between the inner and outer plates, including an inner rod and an outer rod. A limit box is welded to the outer side of the inner plate, connecting the inner rod and the limit box. A limit box is welded to the inner side of the outer plate, connecting the outer rod and the limit box. A disturbance plate is welded to the outer side of the outer plate, including a front disturbance plate and a rear disturbance plate.

[0005] Preferably, the inner and outer tie rods are cylindrical, with a protruding plate at the front end of the inner tie rod and a circular hole in the protruding plate, and a groove at the front end of the outer tie rod, with elongated slots on the wing plates on both sides of the groove.

[0006] Preferably, the protruding plate extends into the groove, and the elongated slot and the protruding plate are permeated with threaded steel bars, with bolts fixed at both ends of the threaded steel bars.

[0007] As a preferred option, the limiting box is a box made of rectangular hollow steel plate. The limiting box is equipped with a rotating shaft and two limiting shafts. The tie rod is connected to the limiting box through the rotating shaft, and the limiting shafts are symmetrically arranged on both sides of the rotating shaft.

[0008] Preferably, the inner panel has a shaft at its bottom; the outer panel is connected to the inner panel at its bottom by a shaft around the bottom of the inner panel.

[0009] Preferably, the diameter of the inner plate plus the diameter of the axial reinforcement is greater than the diameter of the circular pier, and a gap is left between the axial reinforcement and the circular pier.

[0010] Preferably, the inner side of the inner plate is welded with multiple layers of axial steel bars, and each layer of axial steel bars is topped with circular arc stirrups, with the spacing between adjacent circular arc stirrups being one-third of the length of the axial steel bars.

[0011] Preferably, the bottom plate of the anti-scouring device is bonded to the concrete sealing the bottom of the circular pier, the anti-scouring device is symmetrically arranged on the outer periphery of the circular pier, and there is a gap between the axial reinforcement and the circular pier.

[0012] Preferably, the disturbance plate includes an upper support rod, a lower support rod, and a plate body; the plate body is welded between the upper support rod and the lower support rod, and the plate body has multiple water-permeable holes; the upper support rod, the lower support rod, and the plate body are welded to the outer side of the outer plate, and steel sheets are welded at the connection between the upper support rod and the lower support rod and the outer plate.

[0013] Preferably, there are four disturbance plates in total, divided into two groups, each group consisting of two plates: a front disturbance plate group and a rear disturbance plate group; the front disturbance plate group is welded on the side facing the water flow direction, and the rear disturbance plate group is welded on the tail of the anti-scouring device; the distance between the rear disturbance plate group and the axis is greater than the distance between the front disturbance plate group and the axis.

[0014] The beneficial effects of this utility model are:

[0015] 1) This utility model uses the structural design of the anti-scouring device to dissipate the scouring energy of the water flow by rotating and sliding the tie rod, thus avoiding the water flow from directly acting on the circular pier and effectively reducing the scouring and erosion of the pier by the water flow. In extreme cases such as landslides that cause the river to carry mud and rocks to impact the pier, the foam concrete inside the device can be broken to further dissipate the impact energy and protect the circular pier from damage.

[0016] 2) The disturbance plate on the outer side of this practical anti-scour device effectively disrupts the water flow, reduces the velocity of the flow around the pier and the wake vortex, and mitigates its impact on the circular pier. This design achieves effective protection for the circular pier without excessively altering the water flow in the basin. The permeable holes on the disturbance plate allow water to pass through without affecting the normal flow of water, while effectively reducing the impact force of the water flow on the pier.

[0017] 3) The main components of this practical anti-erosion device are prefabricated in the factory, requiring only minimal on-site assembly and welding, significantly reducing workload and time on construction sites and improving construction efficiency. After assembly, each connection point is inspected and adjusted to ensure the stability and reliability of the device, further optimizing the construction process.

[0018] 4) The tie rod system of this practical anti-scour device is flexibly designed. The limiting angle of the elongated slot and the limiting shaft can be adjusted according to the monitoring data of the aquatic environment in advance to adapt to different water flow conditions and scour environments. The inner plate diameter and axial reinforcement strength of the device can be adjusted according to the actual size of the circular pier to ensure the compatibility between the device and the pier. Attached Figure Description

[0019] Figure 1 This is a top view of the anti-erosion device of this utility model;

[0020] Figure 2 This is a 1-1 cross-sectional view of the present invention;

[0021] Figure 3 This is a schematic diagram of the inner and outer tie rod connection of this utility model;

[0022] Figure 4 This is a schematic diagram of the internal structure of the limiting box of this utility model;

[0023] Figure 5 This is a front view of the disturbance plate of this utility model;

[0024] Figure 6 This is a schematic diagram of the inner and outer tie rods of this utility model.

[0025] Explanation of reference numerals in the attached drawings: 1. Outer plate; 2. Inner plate; 3. Limiting box; 4. Front disturbance plate; 5. Steel plate; 6. Tie rod; 7. Rear disturbance plate; 8. Foamed concrete; 9. Circular pier; 10. Axial reinforcement; 11. Arc stirrup; 12. Outer tie rod; 13. Inner tie rod; 14. Wing plate; 15. Protruding plate; 16. Threaded steel; 17. Bolt; 18. Rotating shaft; 19. Limiting shaft; 20. Plate body; 21. Water permeable hole; 22. Upper support rod; 23. Lower support rod; 24. Long slot; 25. Circular hole; 26. Axis; 27. Groove. Detailed Implementation

[0026] The present invention will be further described below with reference to embodiments. The description of the embodiments below is only for the purpose of helping to understand the present invention. It should be noted that, for those skilled in the art, several modifications can be made to the present invention without departing from the principle of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0027] Example 1

[0028] As one embodiment, an active anti-scour device for circular piers is proposed, such as... Figure 1-6 As shown, it includes an outer plate 1 and an inner plate 2; the inner plate 2 and the outer plate 1 are circular, and the inner plate 2 is surrounded by a circular pier 9. Multiple axial reinforcing bars 10 protruding towards the circular pier 9 are provided on the inner side of the inner plate 2, and the axial reinforcing bars 10 are evenly distributed and welded to the inner side of the inner plate 2; a connecting rod system 6 is provided between the inner plate 2 and the outer plate 1, the connecting rod system 6 including an inner rod 13 and an outer rod 12; a limit box 3 is welded to the outer side of the inner plate 2, and the inner rod 13 is connected to the limit box 3; a limit box 3 is welded to the inner side of the outer plate 1, and the outer rod 12 is connected to the limit box 3; a disturbance plate is welded to the outer side of the outer plate 1. The disturbance plate includes a front disturbance plate 4 and a rear disturbance plate 7; the inner tie rod 13 and the outer tie rod 12 are cylindrical, the front end of the inner tie rod 13 is provided with a protruding plate 15, the protruding plate 15 is provided with a circular hole 25, the front end of the outer tie rod 12 is provided with a groove 27, and the two side flanges 14 of the groove 27 are provided with elongated slots 24; the protruding plate 15 extends into the groove 27, and the elongated slots 24 and the protruding plate 15 are penetrated by a threaded steel bar 16, and bolts 17 are fixed at both ends of the threaded steel bar 16; the outer tie rod 12 can not only rotate around the threaded steel bar 16, but also slide along the elongated slot 24.

[0029] like Figure 3 As shown, the limiting box 3 is a box made of rectangular hollow steel plate. The limiting box 3 is equipped with a rotating shaft 18 and two limiting shafts 19. The connecting rod 6 is connected to the limiting box 3 through the rotating shaft 18 and can rotate around the rotating shaft 18. The limiting shafts 19 are symmetrically arranged on both sides of the rotating shaft 18 to limit the rotation range of the connecting rod 6.

[0030] like Figure 1 , 4 As shown in Figure 6, the inner plate 2 has a shaft at its bottom; the outer plate 1 is connected to the inner plate 2 at its bottom by a shaft around the bottom of the inner plate 2, allowing the outer plate 1 to rotate around the inner plate 2; the diameter of the inner plate 2 plus the diameter of the axial steel bar 10 is greater than the diameter of the circular pier 9, and there is a gap between the axial steel bar 10 and the circular pier 9; the rotation and sliding of the tie rod 6, as well as the rotation of the bottom plate, are to cope with the downward force of the submerged current in the river and the buoyancy of the rising current. When the water flow acts on the outer plate 1, due to the arrangement of the tie rod 6 and the limiting box 3, the outer plate 1 will sway up and down and in and out with the water flow. The swaying is the energy dissipation of the water flow force. Through energy dissipation, the action of the water flow is prevented from directly acting on the circular pier 9 column. In order to avoid excessive swaying amplitude, a suitable elongated slot 24 and the included angle required for limiting the limiting shaft 19 in the limiting box 3 can be designed based on the previous monitoring data of the water environment. The inner plate 2 has multiple layers of axial steel bars 10 welded on its inner side. Each layer of axial steel bars 10 is topped with a circular arc stirrup 11, and the spacing between adjacent circular arc stirrups 11 is one-third the length of the axial steel bars 10.

[0031] Example 2

[0032] As another embodiment, this second embodiment proposes, based on the first embodiment, a more specific active anti-scouring device applied to circular piers.

[0033] like Figure 1 As shown, the bottom plate of the anti-scouring device and the bottom concrete of the circular pier 9 are bonded together. The anti-scouring device is symmetrically arranged on the outer periphery of the circular pier 9. There is a gap between the axial steel bar 10 and the circular pier 9. Foamed concrete 8 is poured in the gap. Arc-shaped stirrups 11 are arranged above the axial steel bar 10 of each layer, so that the foamed concrete 8 has a certain strength, and the axial steel bar 10 alone cannot achieve sufficient strength.

[0034] like Figure 1 and Figure 5 As shown, the disturbance plate includes an upper support rod 22, a lower support rod 23, and a plate body 20. The plate body 20 is welded between the upper support rod 22 and the lower support rod 23, and has multiple water-permeable holes 21 to allow water to flow through. The upper support rod 22, the lower support rod 23, and the plate body 20 are welded to the outer side of the outer plate 1. Steel plates 5 are welded at the connection between the upper support rod 22 and the lower support rod 23 and the outer plate 1 to improve the stability of the disturbance plate in the water flow. There are four disturbance plates in total, divided into two groups, each group consisting of two plates: four groups of front disturbance plates and seven groups of rear disturbance plates. The four groups of front disturbance plates are welded to the side facing the water flow direction, and the rear... The 7 sets of disturbance plates are welded to the tail of the anti-scouring device; the distance between the rear 7 sets of disturbance plates and the axis 26 is greater than the distance between the front 4 sets of disturbance plates and the axis 26; the front disturbance plate 4 is for disturbing the flow around the pier side. Through the presence of the plate body 20 and the water-permeable hole 21, the flow around the pier side is slowed down and disturbed without affecting the flow of water, thus reducing the impact of the flow around the pier side on the circular pier 9. In addition, when the flow around the pier side passes behind the circular pier 9, it will form a wake vortex area. The rear 7 sets of disturbance plates can disturb the wake through their plate bodies 20 to reduce the impact of the tail vortex on the circular pier 9.

[0035] The installation method of this active anti-scour device applied to circular piers, such as Figure 1-6 As shown, it includes the following steps:

[0036] S1. Pretreatment within the cofferdam;

[0037] S2, Assembly device;

[0038] S3. Arrange circular arc stirrups;

[0039] S4. Install anti-erosion devices;

[0040] S5. Pour foamed concrete;

[0041] S6, Welding disturbance plate;

[0042] S7. Follow-up work;

[0043] In step S1, before assembling the anti-scour device, a water-proofing operation needs to be performed near the circular pier 9 at the assembly location. The anti-scour device needs to be installed after the construction of the circular pier 9 is completed. After the construction of the circular pier 9 is finished, the cofferdam facilities used for its construction are retained to ensure the anti-scour device can be installed. Before assembly, the bottom of the cofferdam is dredged and its elevation is measured, and the quality of the circular pier 9 is checked. Simultaneously, the dimensional parameters of the circular pier 9 are measured and compared with the design parameters to avoid dimensional discrepancies during subsequent construction and to allow for timely adjustments. Due to the uneven elevation of the bottom sealing concrete caused by the construction of the circular pier 9, construction personnel need to measure the elevation within the cofferdam to ensure that the bottom of the anti-scour device fits snugly against the bottom sealing concrete, facilitating subsequent installation work.

[0044] In step S2, the various components of the anti-erosion device are manufactured and assembled in the factory. After the assembly is completed, the connection of each tie rod 6 is checked to see if there is any problem with rotation or smooth sliding, and adjustments are made in a timely manner.

[0045] In step S4, after the circular arc stirrups 11 are arranged, the anti-scouring device is lifted using hoisting equipment. During the hoisting process, the device must be kept stable in the air. When the anti-scouring device is lifted and kept stable, it is slowly lowered and inserted from top to bottom from above the circular pier 9. Finally, the bottom plate of the anti-scouring device is in contact with the bottom sealing concrete. The anti-scouring device is symmetrically arranged on the outer periphery of the circular pier 9, and the axial reinforcement is kept at a certain distance from the pier column.

[0046] In step S5, after the anti-erosion device is placed, foamed concrete 8 is poured into the reinforcing cage composed of axial reinforcing bars 10 and circular stirrups 11 between the inner plate 2 and the circular pier 9. Before construction, strict quality control should be carried out on raw materials, including cement, foaming agent, and admixtures, to ensure they meet relevant standards and design requirements. A comprehensive inspection of construction equipment, such as mixing equipment, foaming machines, and pumping equipment, should be conducted to ensure normal operation and secure pipe joints to prevent malfunctions during construction. Furthermore, proper base treatment is crucial. The base surface must be cleaned of debris and dust to ensure it is flat, firm, and free of looseness and sand. The base should be moistened with water, but not allowed to accumulate, to ensure good bonding between the foamed concrete 8 and the base. The mix proportion of the foamed concrete 8 directly affects its performance; therefore, the optimal mix proportion must be determined through testing to ensure that its wet weight, flowability, porosity, and other indicators meet design requirements. During mixing, cement and water should be mixed evenly to form a uniform cement slurry. Then, foam prepared with a foaming agent should be added, and mixing should continue until the foamed concrete mixture is uniform. During mixing, the mixing time and speed must be carefully controlled to avoid foam breakage or uneven distribution, which would affect the concrete's performance. When pouring, a low-pressure pump should be used, with the pouring pipe at a gentle angle to the pouring surface. The pipe opening should be embedded at least 10cm into the foamed concrete. Avoid spraying from top to bottom to reduce foam breakage and air ingress. Pouring should be done in layers and sections. The pouring time for a single layer should not exceed the initial setting time of the cement. The next layer should be poured after the final setting of the next layer to prevent delamination and cracking of the foamed concrete. After pouring, geotextile should be used immediately for moisture retention curing. Avoid using plastic film, as this will affect the air permeability of the foamed concrete. During curing, the surface should be kept moist, and natural curing should last for at least 3-7 days until the foamed concrete reaches its design strength. During the curing period, damage to the foamed concrete should be prevented. During construction, the wet weight, flowability, and porosity of the foamed concrete 8 should be tested regularly to ensure that it meets the design requirements. To prevent the foaming and expansion of the foamed concrete 8 from being transmitted by the scouring effect of river water, it can quickly fill the gap between the inner plate 2 and the circular pier 9, ensuring the connection between the anti-scouring device and the circular pier 9. Since the foamed concrete 8 has slightly poor impact resistance, when encountering situations such as landslides, the river may carry soil and rocks from the mountain. When these objects impact the outer plate 1 with the water flow, the rotation and sliding of the tie rod 6 cannot completely dissipate the impact energy. The impact will cause the internal foamed concrete 8 to break. The energy of the impact is dissipated by the breaking of the foamed concrete 8, which can further protect the circular pier 9 from damage.

[0047] In step S6, the disturbance plate is also manufactured in the factory in the early stage and welded on site. Because it is a thin plate, it is easy to rotate and twist when hoisted together with the anti-scouring device. Therefore, it is welded on site after the anti-scouring device is installed.

[0048] In step S7, after the disturbance plate is welded, the construction site is cleaned up to avoid pollution of the riverbed. After the cleanup is completed, the cofferdam is dismantled, and on-site construction safety is ensured during the dismantling process.

[0049] It should be noted that the parts in this embodiment that are the same as or similar to those in Embodiment 1 can be referred to each other, and will not be repeated in this application.

[0050] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

Claims

1. A proactive scour protection device applied to a circular pier, characterized in that, The utility model relates to a kind of anti-scouring device of circular pier, including: Outer plate and inner plate;Inner plate and outer plate are circular, and the outer side of circular pier is surrounded by inner plate, and the inner side of inner plate is provided with multiple axial reinforcements protruding towards the direction of circular pier, and axial reinforcement is evenly welded on the inner side of inner plate;Intermediate between inner plate and outer plate is equipped with connecting tie rod system, and connecting tie rod system includes inner tie rod and outer tie rod;Outer side of inner plate is welded with limit box, and inner tie rod and limit box are connected;Inner side of outer plate is welded with limit box, and outer tie rod and limit box are connected;Outer side of outer plate is welded with perturbation plate, and perturbation plate includes front perturbation plate and rear perturbation plate.

2. The active scour protection device for circular piers according to claim 1, characterized in that, Inner tie rod and outer tie rod are cylindrical, and the front end of inner tie rod is provided with protruding plate, and protruding plate is provided with circular hole, and the front end of outer tie rod is provided with recess, and the both sides of wing plate of recess are provided with long slot.

3. A passive anti-scour device for circular piers according to claim 2, characterized in that, Protruding plate extends into recess, and long slot and protruding plate are penetrated by threaded steel, and threaded steel is fixed with bolt at both ends.

4. The active scour protection device for circular piers of claim 1, wherein, Limit box is made of long rectangular hollow steel plate box, and limit box is equipped with rotating shaft and two limit axes, and tie rod is connected by rotating shaft and limit box, and limit axes are symmetrically arranged on both sides of rotating shaft.

5. The active scour protection device for circular piers of claim 1, wherein, Bottom of inner plate is provided with shaft;Bottom of outer plate is connected with inner plate by rotating around shaft of inner plate bottom.

6. The active scour protection device for circular piers of claim 1, wherein, The diameter of inner plate plus the diameter of axial reinforcement is greater than the diameter of circular pier, and there is a gap between axial reinforcement and circular pier.

7. The active scour protection device for circular piers of claim 1, wherein, Multiple axial reinforcements are welded on the inner side of inner plate, and circular hoop reinforcement is arranged above each layer of axial reinforcement, and the interval between adjacent circular hoop reinforcements is one third of the length of axial reinforcement.

8. The active scour protection device for circular piers of claim 1, wherein, The bottom plate of anti-scouring device is attached to the bottom concrete of circular pier, and the anti-scouring device is symmetrically arranged on the outer periphery of circular pier, and there is a gap between axial reinforcement and circular pier.

9. The active scour protection device for circular piers of claim 1, wherein, Perturbation plate includes upper support rod, lower support rod and plate body;Plate body is welded in the middle of upper support rod and lower support rod, and plate body is provided with multiple water-permeable holes;Upper support rod, lower support rod and plate body are welded on the outer side of outer plate, and steel sheet is welded at the connection between upper support rod and lower support rod and outer plate.

10. A passive anti-scour device for circular piers according to claim 9, characterized in that, There are four perturbation plates in total, divided into two groups, each consisting of two, front perturbation plate group and rear perturbation plate group;Front perturbation plate group is welded on one side of water flow direction, and rear perturbation plate group is welded on the tail of anti-scouring device;The distance between rear perturbation plate group and axis is greater than the distance between front perturbation plate group and axis.

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