Bridge pier scouring simulation experiment box

Abstract

The invention discloses a bridge pier scouring simulation experiment box, and belongs to the technical field of bridge engineering, the bridge pier scouring simulation experiment box comprises a support base and a simulation riverbed box in running fit with the support base, the simulation riverbed box comprises a circular box body with an upper end impact opening, the circumferential wall of the circular box body is uniformly provided with a plurality of through holes, and one-way valves are installed in the through holes; a simulation foundation is mounted on the supporting seat, a simulation bridge pier is mounted on the simulation foundation, and the simulation bridge pier upwards penetrates out of the center of the circular box body; a water flow impact simulation box is rotationally and hermetically mounted on the outer side of the circular box body and connected with a pressure pump, a lifting device for controlling the water flow impact simulation box to lift is mounted on the supporting base, and an impact opening is formed in the side wall of the side, facing the circular box body, of the water flow impact simulation box; the position of the impact opening can change in the circumferential direction of the circular box body. The device can accurately simulate different water flow and riverbed conditions, experimental operation and data acquisition are facilitated, and more reliable data are provided for research on pier scouring.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge engineering, and in particular relates to a bridge pier scouring simulation test box. Background Art

[0002] In the field of bridge engineering, bridge pier scour is a crucial and highly concerned issue. Bridge pier scour refers to the phenomenon that under the action of water flow, the riverbed sediment around the bridge pier is carried away by the water flow, resulting in the decline of the riverbed surface around the bridge pier foundation. This phenomenon will pose a serious threat to the stability and safety of the bridge, and may cause local damage to the bridge pier foundation, reduce the bearing capacity of the bridge, and even cause the collapse of the bridge structure, thereby causing huge economic losses and casualties. At present, the research on bridge pier scour is mainly carried out through theoretical analysis, numerical simulation and experimental research. Although theoretical analysis can provide certain theoretical guidance, due to the complexity of actual water flow and riverbed conditions, theoretical models are often difficult to accurately describe the actual process of bridge pier scour. Numerical simulation methods can simulate water flow and sediment movement to a certain extent, but the accuracy of numerical models depends on the accurate description of physical processes and the reasonable selection of parameters, and under some complex boundary conditions, the accuracy of numerical simulation is also subject to certain limitations. Therefore, it is urgent to provide a bridge pier scour simulation test box that can accurately simulate different water flow and riverbed conditions, facilitate experimental operations and data collection, and provide more reliable data for the study of bridge pier scour. Summary of the invention

[0003] In view of this, an object of the present invention is to provide a bridge pier scour simulation test box that can solve the above technical problems.

[0004] In order to achieve the above object, the present invention provides the following technical solutions: The present invention discloses a bridge pier scour simulation test box, comprising a supporting base and a simulated riverbed box rotatably matched with the supporting base, the simulated riverbed box comprising a circular box body with an impact port at the upper end, a plurality of through holes are evenly opened on the peripheral wall of the circular box body, and a one-way valve is installed in the through hole; a simulation foundation is installed on the supporting seat, and a simulated bridge pier is installed on the simulation foundation, and the simulated bridge pier extends upward from the center of the circular box body; a water flow impact simulation box is rotatably sealed and installed on the outer side of the circular box body, the water flow impact simulation box is connected to a pressure pump, and a lifting device for controlling the lifting of the water flow impact simulation box is installed on the supporting base, and an impact port is formed on the side wall of the water flow impact simulation box facing the circular box body, and the position of the impact port can be changed along the circumference of the circular box body.

[0005] Furthermore, the water flow impact simulation box includes an inner arc ring, an outer arc ring, an impact box body, and a rotation drive device. The inner arc ring is rotatably installed on the inner side of the outer arc ring. The inner arc ring and the outer arc ring are simultaneously rotated and sealed with the impact box body. A rotation drive device for controlling the rotation of the inner arc ring and the outer arc ring respectively is installed in the impact box body. The inner arc ring is rotated and sealed with the circular box body. A water tank is formed between the impact box body and the outer arc ring. The openings on the inner arc ring and the outer arc ring overlap to form the impact port.

[0006] Furthermore, an airway and a compression chamber connected to the airway are provided on the inner side of the inner arc ring, a compression airbag is fixedly installed on one end of the inner arc ring, the compression airbag is connected to the compression chamber through the airway, an arc piston is slidingly sealed in the compression chamber, the arc piston is connected to the outer arc ring through a bracket, and an open groove is provided on the outer wall of the inner arc ring for the bracket to make way.

[0007] Furthermore, a limiting plate is fixed on the inner side of the outer arc-shaped ring, and the limiting plate is adjacent to the compression airbag and is used to limit the compression airbag.

[0008] Furthermore, a flange is fixed to the bottom of the inner arc ring, and the flange is used to limit the axial position of the outer arc ring.

[0009] Furthermore, the one-way valve includes a ball, a baffle, and a supporting spring. A conical hole with a large end facing the inner side of the circular box body is formed on the inner end of the through hole. A baffle is fixed to the inner end of the through hole. A through hole is formed on the baffle. The baffle is connected to the ball through a supporting spring, and the ball cooperates with the conical hole.

[0010] Furthermore, the bottom of the circular box is connected to the support base through a column, a rotation groove is opened on the support base, a rotating ring is rotatably installed in the rotating groove, and the lifting device is installed on the rotating ring.

[0011] Furthermore, a central hole is opened on the inner side of the circular box body, an elastic sealing ring is detachably installed in the central hole, and the simulated bridge pier cooperates with the elastic sealing ring.

[0012] The beneficial effects of the present invention are: The present invention discloses a bridge pier scour simulation test box, which can be used to simulate the sediment and river water on the riverbed by setting a simulated riverbed box, and can be used to simulate the water flow by rotating and sealing the water flow impact simulation box installed on the outer side of the circular box. The device can accurately simulate different water flows and riverbed conditions, facilitate experimental operations and data collection, and provide more reliable data for the study of bridge pier scour. Water flows out from the impact port to simulate the scouring of the bridge pier. Specifically, during operation, the lifting and lowering of the water flow impact simulation box can be controlled by a lifting device, so that the height of the water flow impact can be controlled. By changing the circumferential position of the impact port, the direction of the impact port can be adjusted to provide more comprehensive experimental data.

[0013] Other advantages, objectives and features of the present invention will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art may be taught from the practice of the present invention. The objectives and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to make the purpose, technical solution and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration: Figure 1 It is a structural schematic diagram of the experimental box of the present invention; Figure 2 for Figure 1 The enlarged view of point A in the middle; Figure 3 Schematic diagram of the coordination between the inner arc ring and the outer arc ring Figure 1 ; Figure 4 Schematic diagram of the coordination between the inner arc ring and the outer arc ring Figure 2 ; Figure 5 It is a partial cross-sectional view of the inner arc ring.

[0015] The markings in the accompanying drawings are as follows: support base 1, simulated riverbed box 2, circular box body 3, through hole 4, simulated foundation 5, simulated bridge pier 6, water flow impact simulation box 7, lifting device 8, impact port 9, inner arc ring 10, outer arc ring 11, impact box body 12, rotation drive device 13, water tank 14, opening 15, airway 16, compression chamber 17, compression airbag 18, arc piston 19, bracket 20, opening groove 21, limit plate 22, flange 23, ball 24, baffle 25, support spring 26, tapered hole 27, through hole 28, column 29, rotating groove 30, rotating ring 31, center hole 32, elastic sealing ring 33. DETAILED DESCRIPTION

[0016] like Figures 1 to 5As shown, a bridge pier scour simulation test box disclosed in the present invention includes a support base 1 and a simulated riverbed box 2 that rotates with the support base 1. The support base 1 is located at the bottom of the device and is mainly used to provide support for the entire test box. The simulated riverbed box 2 is used to simulate the riverbed conditions, including graded river sand and static water flow on the upper side of the river sand. The simulated riverbed box 2 is located on the upper side of the support base 1, is circular in shape, and can rotate around the central axis.

[0017] Specifically, the simulated riverbed box 2 disclosed in the present invention includes a circular box body 3 with an impact port 9 at the upper end, a plurality of through holes 4 are evenly opened on the peripheral wall of the circular box body 3, the through holes 4 are evenly spaced along the circumference of the circular box body 3, and a one-way valve is installed in each through hole 4; by setting the one-way valve, the water in the circular box body 3 cannot overflow, and the static water flow is added or reduced through the port at the upper end of the circular box body 3 to meet different needs.

[0018] In order to facilitate the fixing of the simulated bridge pier 6, a simulated foundation 5 is installed on the support seat, and a simulated bridge pier 6 is installed on the simulated foundation 5. The contact part between the simulated foundation 5 and the simulated bridge pier 6 can be connected by cast-in-place. The simulated bridge pier 6 passes upward from the center of the circular box 3, so as to facilitate the subsequent flushing of the side of the bridge pier.

[0019] A water flow impact simulation box 7 is installed on the outer rotating seal of the circular box body 3. The water flow impact simulation box 7 is mainly used to provide water flow that can impact the outer side of the pier. The water flow impact simulation box 7 is connected to a pressure pump to provide power for water flow impact. A lifting device 8 for controlling the lifting of the water flow impact simulation box 7 is installed on the support base 1. An impact port 9 is formed on the side wall of the water flow impact simulation box 7 facing the circular box body 3, and the position of the impact port 9 can be changed along the circumference of the circular box body 3.

[0020] The working principle and process of the device of the present invention are as follows: In order to Figure 1 After the circular box 3 is installed, water and graded sediment are added to the circular box 3, and water is filled into the inner side of the water flow impact simulation box 7. After the impact port 9 is aligned with the simulated bridge pier 6, the pressure of the pressure pump is adjusted so that the water in the water flow impact simulation box 7 is ejected from the impact port 9, passes through the through hole 4, and at the same time drives the water and sediment in the circular box 3 to impact the simulated bridge pier 6. The lifting device 8 controls the lifting of the water flow impact simulation box 7, and the height of the water flow impact can be controlled. By changing the circumferential position of the impact port 9, the direction of the impact port 9 can be adjusted to provide more comprehensive experimental data.

[0021] In this embodiment, the water flow impact simulation box 7 includes an inner arc ring 10, an outer arc ring 11, an impact box body 12, and a rotating drive device 13. The inner arc ring 10 and the outer arc ring 11 are both incomplete circular rings with a gap. The diameter of the outer arc ring 11 is slightly larger than that of the inner arc ring 10. The inner arc ring 10 is rotatably installed on the inner side of the outer arc ring 11, that is, the inner wall of the outer arc ring 11 and the outer wall of the inner arc ring 10 are rotatably sealed to prevent water overflow.

[0022] The inner arc ring 10 and the outer arc ring 11 are simultaneously rotatably sealed with the impact box body 12 and can rotate around the same vertical rotation axis. A rotation driving device 13 for controlling the rotation of the inner arc ring 10 and the outer arc ring 11 respectively is installed in the impact box body 12. The inner arc ring 10 is rotatably sealed with the circular box body 3. A water tank 14 is formed between the impact box body 12 and the outer arc ring 11; the openings 15 on the inner arc ring 10 and the outer arc ring 11 overlap to form an impact port 9.

[0023] The rotation drive device 13 disclosed in the embodiment of the present invention includes a motor, a gear and a gear ring. The outer sides of the inner arc ring 10 and the outer arc ring 11 are both equipped with gear rings, which are respectively meshed with corresponding gears. The gears are driven to rotate by the motor, and the motor is fixed to the inner side of the impact box 12. The rotation drive device 13 can drive the inner arc ring 10 and the outer arc ring 11 to rotate a certain arc. When the rotation limit is reached, the impact box 12 can be rotated as a whole to avoid the problem of impact blind spots.

[0024] In this embodiment, an air passage 16 and a compression chamber 17 connected to the air passage 16 are provided on the inner side of the inner arc ring 10. A compression air bag 18 is fixedly installed at one end of the inner arc ring 10. The compression air bag 18 is connected to the compression chamber 17 through the air passage 16. An arc piston 19 is provided in a sliding seal in the compression chamber 17. The arc piston 19 is connected to the outer arc ring 11 through a bracket 20. An opening groove 21 is provided on the outer wall of the inner arc ring 10 for the bracket 20 to make way. Since the inner arc ring 10 and the outer arc ring 11 are independently controlled by a separate rotation drive device 13, when the openings 15 corresponding to the two are staggered, since the size of the impact port 9 is determined according to the overlapping area of ​​the openings 15 of the two, the size of the impact port 9 can be changed by changing the degree of stagger between the inner arc ring 10 and the outer arc ring 11, thereby changing the size of the impact cross section of the water flow.

[0025] In this embodiment, a limiting plate 22 is fixed on the inner side of the outer arc ring 11. The limiting plate 22 is adjacent to the compressed air bag 18 and is used to limit the compressed air bag 18. The offset position can be sealed to make the experimental data more accurate.

[0026] In this embodiment, a flange 23 is fixed to the bottom of the inner arc ring 10 , and the flange 23 is used to limit the axial position of the outer arc ring 11 , so as to facilitate the matching between the inner arc ring 10 and the outer arc ring 11 .

[0027] In this embodiment, the one-way valve includes a ball 24, a baffle 25, and a support spring 26. A conical hole 27 with a large end facing the inner side of the circular box 3 is formed on the inner side of the through hole 4. A baffle 25 is fixed to the inner end of the through hole 4. A through hole 28 is formed on the baffle 25. The baffle 25 is connected to the ball 24 through the support spring 26. The ball 24 cooperates with the conical hole 27 to ensure that the water flow in the circular box 3 will not overflow, but the water flow in the impact box 12 can move inward to simulate the impact water flow.

[0028] In this embodiment, the bottom of the circular box body 3 is connected to the support base 1 through a column 29. A rotating groove 30 is opened on the support base 1. A rotating ring 31 is rotatably installed in the rotating groove 30. The lifting device 8 is installed on the rotating ring 31. By rotating the rotating ring 31, the circumferential position of the impact box body 12 can be changed, thereby adjusting the position of the impact port 9.

[0029] In this embodiment, a central hole 32 is opened on the inner side of the circular box body 3, and an elastic sealing ring 33 is detachably installed in the central hole 32. The simulated bridge pier 6 cooperates with the elastic sealing ring 33 to achieve sealing of the bridge pier. By replacing different elastic sealing rings 33, it can adapt to different bridge piers and meet the needs of different experimental data.

[0030] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A bridge pier scour simulation test box, characterized in that: It includes a supporting base and a simulated riverbed box rotatably matched with the supporting base, the simulated riverbed box includes a circular box body with an impact port at the upper end, a plurality of through holes are evenly opened on the peripheral wall of the circular box body, and a one-way valve is installed in the through hole; a simulation foundation is installed on the supporting seat, and a simulated bridge pier is installed on the simulation foundation, and the simulated bridge pier extends upward from the center of the circular box body; a water flow impact simulation box is rotatably sealed and installed on the outer side of the circular box body, and the water flow impact simulation box is connected to a pressure pump, and a lifting device for controlling the lifting of the water flow impact simulation box is installed on the supporting base, and an impact port is formed on the side wall of the water flow impact simulation box facing the circular box body, and the position of the impact port can be changed along the circumference of the circular box body.

2. The bridge pier scour simulation test box according to claim 1, characterized in that: The water flow impact simulation box includes an inner arc ring, an outer arc ring, an impact box body, and a rotation drive device. The inner arc ring is rotatably installed on the inner side of the outer arc ring. The inner arc ring and the outer arc ring are simultaneously rotated and sealed with the impact box body. A rotation drive device for controlling the rotation of the inner arc ring and the outer arc ring respectively is installed in the impact box body. The inner arc ring is rotated and sealed with the circular box body. A water tank is formed between the impact box body and the outer arc ring. The openings on the inner arc ring and the outer arc ring overlap to form the impact port.

3. The bridge pier scour simulation test box according to claim 2 is characterized by: An airway and a compression chamber connected to the airway are provided on the inner side of the inner arc ring. A compression airbag is fixedly installed on one end of the inner arc ring. The compression airbag is connected to the compression chamber through the airway. An arc piston is provided in a sliding seal in the compression chamber. The arc piston is connected to the outer arc ring through a bracket. An open groove is provided on the outer wall of the inner arc ring for the bracket to make way.

4. The bridge pier scour simulation test box according to claim 3 is characterized by: A limiting plate is fixed on the inner side of the outer arc-shaped ring, and the limiting plate is adjacent to the compression airbag and is used for limiting the compression airbag.

5. The bridge pier scour simulation test box according to claim 4 is characterized by: A flange is fixed to the bottom of the inner arc ring, and the flange is used to limit the axial position of the outer arc ring.

6. The bridge pier scour simulation test box according to claim 1 is characterized by: The one-way valve includes a ball, a baffle, and a supporting spring. A tapered hole with a large end facing the inner side of the circular box body is formed on the inner end of the through hole. A baffle is fixed to the inner end of the through hole. A through hole is formed on the baffle. The baffle is connected to the ball through a supporting spring, and the ball cooperates with the tapered hole.

7. The bridge pier scour simulation test box according to claim 1 is characterized by: The bottom of the circular box is connected to a supporting base through a column. A rotating groove is provided on the supporting base. A rotating ring is rotatably installed in the rotating groove. The lifting device is installed on the rotating ring.

8. A bridge pier scour simulation test box according to any one of claims 1 to 7, characterized in that: A central hole is provided on the inner side of the circular box body, an elastic sealing ring is detachably installed in the central hole, and the simulated bridge pier cooperates with the elastic sealing ring.

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