Pier foundation local scouring protection device based on water conservancy project and construction method

Abstract

The invention discloses a pier foundation local scour protection device based on a water conservancy project and a construction method, and relates to the technical field of dam pier retaining bricking.The pier foundation local scour protection device comprises a fixed base which is integrally formed and arranged in a dam riverbed together with the bottom of a pier, the fixed base is attached to the pier, and a plurality of mounting grooves used for mounting monitoring assemblies are formed in the outer side of the fixed base; the monitoring assembly is located in the mounting groove to monitor water flow state change data; and the movable assembly is matched with the fixed base and can move relative to the fixed base, and the movable assembly obtains the water flow state change data obtained by the monitoring assembly and conducts adjustment according to the water flow state change data. The fixed base arranged at the bottom of the pier is matched with the movable assembly capable of moving and changing, when the water flow scouring state is changed, the movable assembly changes the state according to the water flow scouring state change and the matching of the movable assembly and the fixed base, the protection position of the protection device is adjusted, and the protection effect under different water flow scouring directions and heights is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of dam pier protection, and in particular to a local scour protection device and a construction method for a pier foundation based on a water conservancy project. Background Art

[0002] The principle of bridge pier scour protection is mainly to protect the bridge pier foundation by changing the flow mode of water flow and reducing the impact force of water flow. Common protection principles include:

[0003] Block and disperse water flow: By setting up guard rings, sleeves or riprap around the piers, the water flow can be blocked and dispersed to reduce the intensity of the water flow directly impacting the pier foundation; change the direction of water flow: use devices such as concrete hinge rows or ring-wing piers to change the direction of water flow and slow down the speed of water flow, thereby reducing scouring; increase the stability of the riverbed: increase the stability of the riverbed by riprap or laying protective plates to prevent sediment from being washed away; weaken the vortex effect: set up protective devices around the piers to weaken the strength of horseshoe vortices and wake vortices, and reduce the scouring effect of these vortices on the pier foundation.

[0004] Publication No. CN112746556B discloses a method for protecting bridge piers from scour by combining a concave rotating normal surface with granular material. This method is used to protect the foundation of bridge piers across the sea or across a river from scour. When the local scour pit around the bottom of the bridge pier or bridge pile reaches a set depth, a concave rotating normal surface protection structure is laid, and granular material of a specific thickness is laid inside the rotating normal surface protection structure. The protection method of the present invention organically combines the normal surface structure in the scour pit to resist the downwash flow with the granular material layer to weaken the horseshoe vortex. The normal surface structure is mainly used to resist the downwash flow in front of the pier, and the granular material layer can reduce the horseshoe vortex around the bridge pier. The protection system can reduce the energy of the downwash flow and horseshoe vortex around the bridge pier during the use of the bridge, reduce local scour, and effectively protect the bridge pier foundation.

[0005] Since the changes of water flow are different in different periods, the impact on the scouring of bridge piers is also different. The method of protecting bridge piers from scouring is mostly achieved by casting fixed scouring protection structures. The shape and position of the scouring protection structure depend on the state of water flow.

[0006] The protective effect of the scour protection structure against scour is related to the scour state of the water flow and the shape of the protective structure. The direction of the water flow and the scour force directly affect the protective effect of the protective structure. The protective effect of the conical or streamlined protective structure will be reduced when the water flow hits the bridge pier from the side, and the protective effect of the circular or arc-shaped protective structure will also change when the water flow changes greatly. Therefore, it is necessary to propose a scour protection device that reduces the impact of the change in the scour state of the water flow on the protective structure. Summary of the invention

[0007] One of the purposes of the present invention is to provide a local scour protection device and construction method for a bridge pier foundation based on a water conservancy project, so that corresponding adjustments can be made when the water scour state changes, and the protection device has a protective effect against multiple scour states.

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: A local scour protection device for a pier foundation based on a water conservancy project, comprising:

[0009] The fixed base is integrally formed and arranged inside the riverbed of the dam together with the bottom of the bridge pier. The fixed base is arranged in close contact with the bridge pier. A plurality of installation grooves for installing monitoring components are arranged outside the fixed base. The monitoring components are located inside the installation grooves to monitor the data of water flow state changes.

[0010] A moving component cooperates with the fixed base and can move relative to the fixed base, the moving component obtains the water flow state change data obtained by the monitoring component, and makes adjustments according to the water flow state change data;

[0011] The arc structure is provided on the outside of the moving component and the fixed base, and the sizes of the arc structures provided on the moving component and the fixed base are inconsistent. The moving component adjusts the position so that the arc structure on the outside of the moving component matches the arc structure provided on the fixed base.

[0012] The laminating plate is arranged at the matching position between the moving component and the fixed base to reduce the wear of the moving component and the fixed base;

[0013] The processing terminal obtains the water flow state change data monitored by the monitoring component, determines the motion data of the moving component according to the water flow state change data, and controls the moving component to adjust relative to the fixed base based on the motion data.

[0014] In one or more embodiments of the present invention, the arc structure includes a first arc groove arranged on the outside of the fixed base and a second arc groove arranged on the outside of the moving component. The opening size and spiral angle of the first arc groove are consistent, and the opening size of the second arc groove is arranged from large to small. The connection position between the second arc groove and the first arc groove is an arc transition setting, and the spiral angle of the second arc groove changes sequentially.

[0015] In one or more embodiments of the present invention, the monitoring component includes a mounting frame, a floating plate is provided on the top or bottom of the mounting frame, the floating plate is used to support the position of the monitoring component, and the mounting groove is used to limit the up and down movement position of the monitoring component.

[0016] In one or more embodiments of the present invention, the monitoring component further comprises:

[0017] A positioning frame, wherein a swingable card plate is arranged inside the positioning frame, a swingable detection plate is arranged inside the card plate, and a swing axis of the detection plate is perpendicular to the swing axis of the card plate;

[0018] The posture sensor is installed on the inner side of the pallet to monitor the position of the pallet;

[0019] The flow rate sensor is installed on the inner side of the detection plate and is used to monitor the water flow rate.

[0020] In one or more embodiments of the present invention, the movable assembly is composed of a first movable member, a second movable member, and a driving unit for driving the first movable member and the second movable member;

[0021] The processing terminal obtains the swing angle of the card plate in each monitoring component and calculates the flow direction of the water according to the swing angle of the card plate:

[0022] The collected card swing angle data is transmitted to the processing terminal, and the swing direction θ of each card is calculated using the following formula: i :

[0023]

[0024] Among them, θ i is the swing angle of the ith wing, x i and i are the displacements of the wing in the horizontal and vertical directions, respectively;

[0025] By analyzing the swing angles of multiple pallets, the main direction of the water flow is determined. Using the vector synthesis method, the swing direction vectors of all pallets are synthesized to obtain the overall direction D of the water flow:

[0026]

[0027] Where D is the overall direction vector of the water flow, d i is the swing direction vector of the i-th wing plate, and n is the total number of wing plates.

[0028] In one or more embodiments of the present invention, the first movable member includes:

[0029] The meshing platform is screw-mounted on the inner side of the fixed base. The meshing platform is inserted into the inner side of the fixed base from the upper part of the fixed base, and the arc-shaped structure is opened on the outer wall of the meshing platform.

[0030] The spiral groove is opened on the outer wall of the fixed base, and the meshing platform extends into the spiral groove and moves up and down in a spiral shape under the restriction of the spiral groove;

[0031] The slot is arranged in the middle of the fixed base, and the engaging platform extends into the slot.

[0032] In one or more embodiments of the present invention, the second movable member includes:

[0033] The guide plate is rotatably arranged on the outer side of the fixed base and the meshing platform, and the inner side of the guide plate is in contact with the fixed base and the outer wall of the meshing platform;

[0034] The cone is located outside the guide plate, a guide rail is arranged on the outer wall of the guide plate, and the cone extends into the guide rail and its movement path is restricted by the guide rail;

[0035] The floating plate is arranged on the top of the frustum, and the floating plate can swing relative to the frustum.

[0036] In one or more embodiments of the present invention, the driving unit includes:

[0037] A fixed frame is fixedly installed on the outside of the bridge pier. A driving motor is arranged inside the fixed frame. The driving motor is used as a driving member to drive the meshing platform to move. The driving platform and the driving motor are driven by a transmission assembly. The driving platform is driven to move by multiple driving motors.

[0038] The positioning plate is rotatably arranged outside the meshing platform. A rotating motor is arranged outside the meshing platform. The rotating motor meshes with the positioning plate and drives the positioning plate to rotate relative to the meshing platform.

[0039] The present invention also provides a construction method for a local scour protection device for a pier foundation, which is used for the above-mentioned scour protection device and comprises the following steps:

[0040] Open a foundation pit, build a frame inside the foundation pit, pour concrete into the lower part of the fixed base, and install the upper part of the fixed base on the upper part of the lower part of the fixed base. After the concrete reaches a certain strength, remove the frame;

[0041] Build the pier frame on the top of the fixed base and pour concrete. When the concrete reaches a certain strength, remove the pier frame and build an installation platform. Hoist the moving assembly onto the top of the fixed base so that the fixed base is engaged with the moving assembly.

[0042] Install the monitoring component on the outside of the fixed base, debug the sensitivity of the monitoring component, and determine the monitoring stability of the monitoring component;

[0043] Test the movement path of the moving component and measure the error of the moving component. After adjusting the error, connect the moving component to the bridge pier. After the concrete is dried, fill the foundation pit, remove the enclosure, and allow water to flow into the enclosure.

[0044] In one or more embodiments of the present invention, before the moving assembly is hoisted, the pier is cast to the connection position between the moving assembly and the pier to facilitate the hoisting of the moving assembly. The moving assembly and the fixed base can be installed by prefabricating or casting.

[0045] Through the above technical solution, the present invention has the following beneficial effects:

[0046] 1. The present invention cooperates with a fixed base arranged at the bottom of the bridge pier and a movable component that can be moved and changed. When the water flow scouring state changes, the movable component changes according to the water flow scouring state, and the movable component and the fixed base cooperate to change the state, adjust the protective position of the protective device, and ensure the protective effect under different water flow scouring directions and heights.

[0047] 2. The moving component and the fixed base are spirally matched. When protecting the bridge piers, the moving component spirally adjusts its position with the fixed base, and arc structures are set on the surface of the fixed base and the moving component. When the moving component spirally moves, the arc structures between the moving component and the fixed base cooperate with each other to achieve different protection effects. The water flow is guided by the arc structure to reduce the turbulence and vortex of the water flow.

[0048] 3. The movable component includes two movable parts, one is a first movable part that cooperates with the fixed base to perform spiral motion, the first movable part is in contact with the base and can change its height, and the other is a second movable part that is in contact with the first movable part and the base, the second movable part can move up and down and can rotate relative to the first movable part, thereby realizing protection against multiple directions and multiple water flow scouring intensities and ensuring the protection effect.

[0049] 4. The water flow changes and the direction of water flow at the bridge piers can be obtained through the monitoring components installed on the outside of the fixed base, and the dynamic components can be adjusted according to the monitoring of the water flow status by the monitoring components. According to the changes of the water flow at the bridge piers, the dynamic components and the fixed base can cooperate to protect the bridge piers. Adjusting the dynamic components according to the water flow status can reduce the loss of the protective device caused by water flow scouring and ensure the service life of the protective device. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 A perspective view of the present invention;

[0051] Figure 2 A schematic diagram of a removal monitoring assembly of the present invention;

[0052] Figure 3 It is a schematic diagram of the structure in which the moving assembly and the fixed base are separated according to the present invention;

[0053] Figure 4 It is a schematic diagram of removing the fixed base of the present invention;

[0054] Figure 5 is a schematic diagram of a second movable member of the present invention;

[0055] Figure 6 is an exploded view of a second movable member of the present invention;

[0056] Figure 7 It is an exploded view of the frustum and floating sheet structure of the present invention;

[0057] Figure 8It is a schematic diagram of the local structure of the present invention;

[0058] Fig. 9 It is a schematic diagram of a fixed base of the present invention;

[0059] Fig.10 It is a schematic diagram of the monitoring component of the present invention;

[0060] Fig.11 An exploded view of the monitoring assembly of the present invention;

[0061] Fig.12 It is a schematic diagram of the moving assembly and the local fixed base of the present invention;

[0062] Fig.13 A cross-sectional view of the meshing table of the present invention;

[0063] Fig.14 Schematic diagram of a driving unit of the present invention.

[0064] In the figure: 1 fixed base, 2 moving assembly, 3 monitoring assembly, 4 mounting slot, 5 arc structure, 6 bonding plate;

[0065] 21 first movable member: 211 engagement table, 212 spiral groove, 213 slot;

[0066] 22 second movable member: 221 guide plate, 222 cone, 223 guide rail;

[0067] 23 driving unit: 231 fixing frame, 232 driving motor, 233 positioning plate, 234 rotating motor;

[0068] 31 mounting frame, 32 floating plate, 33 positioning frame, 34 card plate, 35 detection plate, 36 posture sensor, 37 flow rate sensor;

[0069] 51 is a first arcuate groove, 52 is a second arcuate groove. DETAILED DESCRIPTION

[0070] The following will disclose multiple embodiments of the present invention with the accompanying drawings. For the purpose of clear description, many practical details will be described together in the following description. However, it should be understood that these practical details should not be used to limit the present invention. In other words, in some embodiments of the present invention, these practical details are not necessary. And if it is possible to implement, the features of different embodiments can be applied interchangeably.

[0071] Unless otherwise defined, all words (including technical and scientific terms) used herein have their usual meanings, which can be understood by those familiar with this field. Furthermore, the definitions of the above words in commonly used dictionaries should be interpreted as the meanings consistent with the relevant fields of the present invention in the content of this specification. Unless otherwise clearly defined, these words will not be interpreted as idealized or overly formal meanings.

[0072] See also Figure 1-Figure 14 The present invention provides a local scour protection device and a construction method for a bridge pier foundation based on a water conservancy project. A protection device is arranged on the outside of the bridge pier to protect the bridge pier, thereby preventing the scour of water flow from affecting the bridge pier and ensuring the strength and service life of the bridge pier.

[0073] In one embodiment, the scour protection device comprises:

[0074] The fixed base 1 is integrally formed and arranged inside the riverbed of the dam together with the bottom of the bridge pier. The fixed base 1 is arranged in close contact with the bridge pier. A plurality of installation grooves 4 for installing monitoring components 3 are arranged outside the fixed base 1. The monitoring components 3 are located inside the installation grooves 4 to monitor the data of water flow state changes.

[0075] The moving component 2 cooperates with the fixed base 1 and can move relative to the fixed base 1. The moving component 2 obtains the water flow state change data obtained by the monitoring component 3 and makes adjustments according to the water flow state change data;

[0076] The arc structure 5 is provided outside the moving component 2 and the fixed base 1, and the sizes of the arc structures 5 provided on the moving component 2 and the fixed base 1 are inconsistent. The moving component 2 adjusts its position so that the arc structure 5 on the outside of the moving component 2 matches the arc structure 5 provided on the fixed base 1.

[0077] The laminating plate 6 is arranged at the matching position between the moving component 2 and the fixed base 1 to reduce the wear of the moving component 2 and the fixed base 1;

[0078] The processing terminal obtains the water flow state change data monitored by the monitoring component 3, determines the motion data of the moving component 2 according to the water flow state change data, and controls the moving component 2 to adjust relative to the fixed base 1 based on the motion data.

[0079] In this embodiment, the fixed base 1 cooperates with the moving component 2 to achieve the adjustment of the state of the protection structure, so that the protection device is not limited to a fixed structural position, and can be adjusted accordingly according to the water flow state change data, so as to achieve a stable protection purpose when the water flow state changes. Since the spiral movement of the moving component 2 will change the height of the moving component 2, a larger protection area can be obtained.

[0080] Optionally, the monitoring component 3 changes its position in the water flow through buoyancy. In this state, the top of the monitoring component 3 is always on the surface of the water flow, and is used to monitor the flow speed and direction on the surface of the water flow and inside the water flow. It is suitable for dams with high water levels.

[0081] Alternatively, the monitoring component 3 is fixed inside the mounting groove 4 to monitor the data of water flow state changes. When the water flow changes, the monitoring component 3 is located in a fixed position, which is suitable for dams with low water levels.

[0082] In one embodiment, the arc structure 5 includes a first arc groove 51 arranged on the outside of the fixed base 1 and a second arc groove 52 arranged on the outside of the moving component 2. The opening size and spiral angle of the first arc groove 51 are consistent, and the opening size of the second arc groove 52 is arranged from large to small. The connection position between the second arc groove 52 and the first arc groove 51 is an arc transition setting, and the spiral angle of the second arc groove 52 changes sequentially.

[0083] In this embodiment, the first arc groove 51 and the second arc groove 52 are provided separately, so that when the position of the moving component 2 is adjusted, the first arc groove 51 and the second arc groove 52 at different positions can be connected. Since the size and spiral angle of the second arc groove 52 vary, different changes can be made to the water flow at different heights by adjusting the moving component 2.

[0084] Optionally, the size of the second arc-shaped groove 52 increases from top to bottom.

[0085] In one embodiment, the monitoring component 3 includes a mounting frame 31 , a floating plate 32 is provided on the top or bottom of the mounting frame 31 , the floating plate 32 is used to support the position of the monitoring component 3 , and the mounting groove 4 is used to limit the up and down movement position of the monitoring component 3 .

[0086] In this embodiment, the position of the monitoring component 3 is adjusted by the floating plate 32 , so that the monitoring component 3 can change with the change of the water flow height, thereby ensuring the position of the monitoring component 3 .

[0087] In one embodiment, the monitoring component 3 further includes:

[0088] A positioning frame 33, inside which a swingable clamping plate 34 is arranged, and inside the clamping plate 34 a swingable detection plate 35 is arranged, and the swing axis of the detection plate 35 is perpendicular to the swing axis of the clamping plate 34;

[0089] A posture sensor 36 is installed inside the card plate 34 to monitor the position of the card plate 34;

[0090] The flow rate sensor 37 is installed inside the detection plate 35 and is used to monitor the flow rate of the water flow.

[0091] In this embodiment, a wing plate is provided in the middle of the card plate 34, and the wing plate is vertically arranged. The wing plate swings in the direction of the water flow under the push of the water flow. The swing of the card plate 34 will drive the detection plate 35 inside it to move, so that the detection plate 35 is facing the water flow, and the water flow velocity is monitored by the flow velocity sensor 37.

[0092] Optionally, when the monitoring component 3 is pushed to change its position by the floating plate 32, the positioning frame 33 is fixed to the inner side of the mounting frame 31. At this time, two flow rate sensors 37 are arranged at upper and lower symmetrical positions of the detection plate 35 to obtain the flow rate change between the upper water flow and the lower water flow.

[0093] Alternatively, when the monitoring component 3 is fixed inside the mounting groove 4 and is restricted by the mounting groove 4, the positioning frame 33 extends into the mounting groove 4. At this time, a flow rate sensor 37 is provided at the bottom of the detection plate 35 to monitor the water flow rate.

[0094] The swing position of the card plate 34 is acquired by using the attitude sensor 36 . Under the action of the wing plate, the card plate 34 changes position with the water flow, thereby determining the direction of the water flow, and the flow rate sensor 37 is used to determine the flow rate of the water flow.

[0095] In another embodiment, a height sensor is disposed inside the floating plate 32 to obtain the height position of the water surface.

[0096] In one embodiment, the movable assembly 2 is composed of a first movable member 21 and a second movable member 22 and a driving unit 23 for driving the first movable member 21 and the second movable member 22;

[0097] The processing terminal obtains the swing angle of the card plate 34 in each monitoring component 3, and calculates the flow direction of the water flow according to the swing angle of the card plate 34:

[0098] The collected swing angle data of the card plate 34 is transmitted to the processing terminal, and the swing direction θ of each card plate 34 is calculated using the following formula: i :

[0099]

[0100] Among them, θ i is the swing angle of the ith wing, x i and i are the displacements of the wing in the horizontal and vertical directions, respectively;

[0101] By analyzing the swing angles of multiple card plates 34, the main direction of the water flow is determined. Using the vector synthesis method, the swing direction vectors of all card plates 34 are synthesized to obtain the overall direction D of the water flow:

[0102]

[0103] Where D is the overall direction vector of the water flow, d i is the swing direction vector of the i-th wing plate, and n is the total number of wing plates.

[0104] In this embodiment, the overall direction of water flow is determined by changing the positions of multiple clamping plates 34, which makes it easy to adjust the second movable member 22 according to the change in the overall direction of the water flow, and use the second movable member 22 to guide the change of the water flow, thereby ensuring a stable protective effect.

[0105] Since each clamping plate 34 will change under the action of water flow, the main flushing surface of the protective device can be determined by calculating the overall direction of the water flow, and the position of the second movable member 22 can be adjusted according to the main flushing surface to further ensure the protective effect.

[0106] In one embodiment, the first movable member 21 comprises:

[0107] The meshing platform 211 is screw-mounted on the inner side of the fixed base 1. The meshing platform 211 is inserted into the inner side of the fixed base 1 from the upper part of the fixed base 1. The arc structure 5 is opened on the outer wall of the meshing platform 211.

[0108] The spiral groove 212 is formed on the outer wall of the fixed base 1, and the engaging platform 211 extends into the spiral groove 212, and moves up and down in a spiral shape under the restriction of the spiral groove 212;

[0109] The slot 213 is formed in the middle of the fixed base 1 , and the engaging platform 211 extends into the slot 213 .

[0110] Optionally, an elastic member is provided at the contact position between the inner wall of the slot 213 and the outer wall of the engagement platform 211 , and water cannot enter the slot 213 under the force of the elastic members fitting together, and the elastic member is corrosion-resistant rubber.

[0111] In this embodiment, the docking positions of the engaging platform 211 and the fixed base 1 are both arc-shaped. In order to prevent the docking positions of the engaging platform 211 and the fixed base 1 from being subjected to greater impact, the end of the engaging platform 211 extending into the interior of the fixed base 1 is consistent in size with the uppermost end of the fixed base 1, so that a stable transition can be formed when flushed by water.

[0112] In one embodiment, the second movable member 22 comprises:

[0113] The guide plate 221 is rotatably disposed on the outer sides of the fixed base 1 and the engaging platform 211, and the inner side of the guide plate 221 is in contact with the outer wall of the fixed base 1 and the engaging platform 211;

[0114] The cone 222 is located outside the guide plate 221. A guide rail 223 is provided on the outer wall of the guide plate 221. The cone 222 extends into the inside of the guide rail 223 and its movement path is limited by the guide rail 223.

[0115] The floating plate is disposed on the top of the frustum 222 , and the floating plate can swing relative to the frustum 222 .

[0116] In this embodiment, the setting of the cone 222 can serve the purpose of cutting through the water flow and guiding the direction of the water flow, and the float 32 is on the upper part of the cone 222. Firstly, it is used to maintain the buoyancy of the cone 222, and secondly, it can enable the cone 222 to move up and down when flushed by the water flow, so as to guide the water flow to change its position and direction.

[0117] In one embodiment, the drive unit 23 comprises:

[0118] The fixing frame 231 is fixedly installed outside the bridge pier. A driving motor 232 is arranged inside the fixing frame 231. The driving motor 232 is used as a driving member to drive the meshing platform 211 to move. The driving platform and the driving motor 232 are driven by a transmission assembly 2. The driving platform is driven to move by multiple driving motors 232.

[0119] The positioning plate 233 is rotatably disposed outside the engagement platform 211 . A rotary motor 234 is disposed outside the engagement platform 211 . The rotary motor 234 engages with the positioning plate 233 and drives the positioning plate 233 to rotate relative to the engagement platform 211 .

[0120] In this embodiment, the engagement platform 211 is driven to rotate by the driving unit 23, and due to the limitation of the spiral groove 212, the engagement platform 211 will move up and down while rotating, thereby adjusting the position of the engagement platform 211, and the movement of the engagement platform 211 drives the rotating motor 234 and the positioning plate 233 to move up and down, and the guide plate 221 is fixed to the bottom of the positioning plate 233, and the positioning plate 233 is driven to move by the rotating motor 234 to change the direction of the guide plate 221.

[0121] Optionally, in order to ensure the stability of the up and down movement of the meshing platform 211, a support member is set between the meshing platform 211 and the fixed frame 231, and the support member is inserted into the meshing platform 211 by the fixed frame 231 to support the meshing platform 211 and prevent the driving motor 232 from being subjected to excessive force.

[0122] The present invention also provides a construction method for a local scour protection device for a pier foundation, which is used for the above-mentioned scour protection device and comprises the following steps:

[0123] A foundation pit is opened, a frame is built inside the foundation pit, the lower part of the fixed base 1 is poured with concrete, and the upper part of the fixed base 1 is installed on the upper part of the lower part of the fixed base 1. After the concrete reaches a certain strength, the frame is removed;

[0124] Build a pier frame on the upper part of the fixed base 1 and pour concrete. After the concrete reaches a certain strength, remove the pier frame and build an installation platform. Hoist and install the moving component 2 on the upper part of the fixed base 1 so that the fixed base 1 is engaged with the moving component 2.

[0125] Install the monitoring component 3 on the outside of the fixed base 1, debug the sensitivity of the monitoring component 3, and determine the monitoring stability of the monitoring component 3;

[0126] The movement path of the moving component 2 is tested and the error of the moving component 2 is measured. After the error is adjusted, the moving component 2 is connected to the bridge pier. After the concrete is dried, the foundation pit is filled and the enclosure is removed, and the water flows into the enclosure.

[0127] In one embodiment, before lifting the moving component 2, the pier is cast to the connection position between the moving component 2 and the pier to facilitate the lifting of the moving component 2. The moving component 2 and the fixed base 1 can be installed by prefabricating or casting.

[0128] In summary, the technical solutions disclosed in the above embodiments of the present invention have at least the following advantages:

[0129] 1. The present invention cooperates a fixed base 1 arranged at the bottom of the bridge pier with a movable component 2. When the water flow scouring state changes, the movable component 2 changes according to the water flow scouring state. The movable component 2 and the fixed base 1 change the state, adjust the protective position of the protective device, and ensure the protective effect under different water flow scouring directions and heights.

[0130] 2. The moving component 2 is spirally matched with the fixed base 1. When protecting the bridge pier, the moving component 2 is spirally adjusted in position with the fixed base 1, and the fixed base 1 and the moving component 2 are both provided with arc structures 5 on their surfaces. When the moving component 2 is spirally moved, the arc structures 5 between the moving component 2 and the fixed base 1 cooperate with each other to achieve different protection effects, and the water flow is guided by the arc structure 5 to reduce the turbulence and vortex of the water flow.

[0131] 3. The movable component 2 includes two movable parts, one is a first movable part 21 that cooperates with the fixed base 1 to perform spiral motion, the first movable part 21 is in contact with the base and can change its height, and the other is a second movable part 22 that is in contact with the first movable part 21 and the base, the second movable part 22 can move up and down and can rotate relative to the first movable part 21, thereby realizing protection against multiple directions and multiple water flow scouring intensities and ensuring the protection effect.

[0132] 4. The water flow changes and the scouring direction of the water flow at the bridge piers are obtained by the monitoring component 3 arranged on the outside of the fixed base 1, and the dynamic component 2 can be adjusted according to the monitoring of the water flow state by the monitoring component 3. According to the changes of the water flow at the bridge piers, the dynamic component 2 and the fixed base 1 cooperate to protect the bridge piers. Adjusting the dynamic component 2 according to the scouring state of the water flow can reduce the loss of the protective device caused by the scouring of the water flow and ensure the service life of the protective device.

[0133] Although the present invention is disclosed in conjunction with the above embodiments, it is not intended to limit the present invention. Anyone familiar with this technology can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the definition of the attached claims.

Claims

1. A local scour protection device for bridge pier foundation based on water conservancy engineering, characterized in that: include: The fixed base is integrally formed and arranged inside the riverbed of the dam together with the bottom of the bridge pier. The fixed base is arranged in close contact with the bridge pier. A plurality of installation grooves for installing monitoring components are arranged outside the fixed base. The monitoring components are located inside the installation grooves to monitor the data of water flow state changes. A moving component cooperates with the fixed base and can move relative to the fixed base, the moving component obtains the water flow state change data obtained by the monitoring component, and makes adjustments according to the water flow state change data; The arc structure is provided on the outside of the moving component and the fixed base, and the sizes of the arc structures provided on the moving component and the fixed base are inconsistent. The moving component adjusts the position so that the arc structure on the outside of the moving component matches the arc structure provided on the fixed base. The laminating plate is arranged at the matching position between the moving component and the fixed base to reduce the wear of the moving component and the fixed base; The processing terminal obtains the water flow state change data monitored by the monitoring component, determines the motion data of the moving component according to the water flow state change data, and controls the moving component to adjust relative to the fixed base based on the motion data.

2. The local scour protection device for bridge pier foundation based on water conservancy project according to claim 1 is characterized in that: The arc structure includes a first arc groove arranged on the outside of the fixed base and a second arc groove arranged on the outside of the moving component. The opening size and spiral angle of the first arc groove are consistent, and the opening size of the second arc groove is arranged from large to small. The connection position between the second arc groove and the first arc groove is an arc transition setting, and the spiral angle of the second arc groove changes sequentially.

3. The local scour protection device for bridge pier foundation based on water conservancy project according to claim 2 is characterized in that: The monitoring component includes a mounting frame, a floating plate is arranged on the top or bottom of the mounting frame, the floating plate is used to support the position of the monitoring component, and the mounting groove is used to limit the up and down movement position of the monitoring component.

4. The local scour protection device for bridge pier foundation based on water conservancy engineering according to claim 3 or 2, characterized in that: Monitoring components also include: A positioning frame, wherein a swingable card plate is arranged inside the positioning frame, a swingable detection plate is arranged inside the card plate, and a swing axis of the detection plate is perpendicular to the swing axis of the card plate; The posture sensor is installed on the inner side of the pallet to monitor the position of the pallet; The flow rate sensor is installed on the inner side of the detection plate and is used to monitor the water flow rate.

5. The local scour protection device for bridge pier foundation based on water conservancy project according to claim 4 is characterized in that: The movable assembly is composed of a first movable member, a second movable member, and a driving unit for driving the first movable member and the second movable member; The processing terminal obtains the swing angle of the card plate in each monitoring component and calculates the flow direction of the water according to the swing angle of the card plate: The collected card swing angle data is transmitted to the processing terminal, and the swing direction θ of each card is calculated using the following formula: i : Among them, θ i is the swing angle of the ith wing, x i and i are the displacements of the wing in the horizontal and vertical directions, respectively; By analyzing the swing angles of multiple pallets, the main direction of the water flow is determined. Using the vector synthesis method, the swing direction vectors of all pallets are synthesized to obtain the overall direction D of the water flow: Where D is the overall direction vector of the water flow, d i is the swing direction vector of the i-th wing plate, and n is the total number of wing plates.

6. The local scour protection device for bridge pier foundation based on water conservancy project according to claim 5 is characterized in that: The first movable member comprises: The meshing platform is screw-mounted on the inner side of the fixed base. The meshing platform is inserted into the inner side of the fixed base from the upper part of the fixed base, and the arc-shaped structure is opened on the outer wall of the meshing platform. The spiral groove is opened on the outer wall of the fixed base, and the meshing platform extends into the spiral groove and moves up and down in a spiral shape under the restriction of the spiral groove; The slot is opened in the middle of the fixed base, and the engaging platform extends into the slot.

7. The local scour protection device for bridge pier foundation based on water conservancy project according to claim 6 is characterized in that: The second movable member comprises: The guide plate is rotatably arranged on the outer side of the fixed base and the meshing platform, and the inner side of the guide plate is in contact with the fixed base and the outer wall of the meshing platform; The cone is located outside the guide plate, a guide rail is arranged on the outer wall of the guide plate, and the cone extends into the guide rail and its movement path is restricted by the guide rail; The floating plate is arranged on the top of the frustum, and the floating plate can swing relative to the frustum.

8. The local scour protection device for bridge pier foundation based on water conservancy project according to claim 7 is characterized in that: The drive unit includes: A fixed frame is fixedly installed on the outside of the bridge pier. A driving motor is arranged inside the fixed frame. The driving motor is used as a driving member to drive the meshing platform to move. The driving platform and the driving motor are driven by a transmission assembly. The driving platform is driven to move by multiple driving motors. The positioning plate is rotatably arranged outside the meshing platform. A rotating motor is arranged outside the meshing platform. The rotating motor meshes with the positioning plate and drives the positioning plate to rotate relative to the meshing platform.

9. A construction method for a local scour protection device for a bridge pier foundation, used for the scour protection device according to any one of claims 1 to 8, characterized in that: The following steps are involved: Open a foundation pit, build a frame inside the foundation pit, pour concrete into the lower part of the fixed base, and install the upper part of the fixed base on the upper part of the lower part of the fixed base. After the concrete reaches a certain strength, remove the frame; Build the pier frame on the top of the fixed base and pour concrete. When the concrete reaches a certain strength, remove the pier frame and build an installation platform. Hoist the moving assembly onto the top of the fixed base so that the fixed base is engaged with the moving assembly. Install the monitoring component on the outside of the fixed base, debug the sensitivity of the monitoring component, and determine the monitoring stability of the monitoring component; Test the movement path of the moving component and measure the error of the moving component. After adjusting the error, connect the moving component to the bridge pier. After the concrete is dried, fill the foundation pit, remove the enclosure, and allow water to flow into the enclosure.

10. The local scour protection device and construction method for bridge pier foundation based on water conservancy engineering according to claim 9 is characterized in that: Before the moving assembly is hoisted, the pier is cast to the connection position between the moving assembly and the pier to facilitate the hoisting of the moving assembly. The moving assembly and the fixed base can be installed by prefabrication or casting.

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