Bridge load test self-adapting torsion device

Abstract

The utility model provides a kind of bridge load test self-adapting torsion device, including clamping frame, lower thrust block, steering correction component, rotary connecting piece, upper thrust block and executor end connector;Clamping frame includes frame body, frame body is used to accommodate the box girder to be measured, the upper side of frame body extends to constitute extension section to one side;Lower thrust block is fixedly arranged in the top of extension section;The upper end surface of lower thrust block is provided with rotary connecting piece installation slot, the lower part of rotary connecting piece is connected with lower thrust block, the upper part of rotary connecting piece is rotatably connected with steering correction component, and rotary connecting piece is used to make steering correction component relatively lower thrust block rotate around the axis of rotary connecting piece;Upper thrust block is fixedly arranged in the upper end of steering correction component;Executor end connector is fixed in the upper end of upper thrust block, for being connected with external thrust executor.The utility model structure is stable, can keep thrust vertical action on clamping surface during loading process, avoid force deviation, and is applicable to the torsion load test of bridge box girder.

Description

Technical Field

[0001] This utility model relates to the field of bridge testing equipment, and in particular to an adaptive torsion device for bridge load testing. Background Technology

[0002] In bridge structural testing, the box girder torsion test is a crucial step in evaluating the torsional stiffness and load-bearing capacity of a bridge. By applying torque to both ends or one end of the box girder and recording the torsional angle, the torsional performance of the box girder section and the stress characteristics of the connection nodes can be directly reflected, providing a basis for structural design optimization and safety assessment.

[0003] Currently, one common approach for box girder torsion testing is to use a combination of multi-point hydraulic jacks and rigid support frames for loading. This approach requires several hydraulic jacks to be evenly distributed along the circumference of the box girder's cross-section on its side. The jacks are connected to rigid clamps on the end face via steel support rods, and the pipeline pressure is manually adjusted to achieve synchronous torque loading. Because the connection between the support rods and the clamps is a rigid pin or plane support, it is difficult to maintain the loading force perpendicular to the clamping surface at all times. Even a slight deviation in the installation angle can cause force shift and localized stress concentration, affecting the accuracy of torque transmission.

[0004] Therefore, there is still a need to provide an adaptive torsion device for bridge load testing to achieve automatic correction of thrust direction and efficient torsion control. Summary of the Invention

[0005] This invention proposes an adaptive torsion device for bridge load testing to overcome the problem that it is difficult to maintain vertical force under torque loading in the prior art.

[0006] To achieve the above objectives, the technical solution proposed by this utility model is as follows: An adaptive torsion device for bridge load testing includes: a clamping frame, a lower thrust block, a steering correction assembly, a rotating connector, an upper thrust block, and an actuator end connector; The clamping frame includes a frame for accommodating the box girder to be tested, and the upper side of the frame extends to one side to form an extension section. The downward thrust block is fixedly disposed above the extension section; The upper end face of the lower thrust block is provided with a rotating connector mounting groove. The lower part of the rotating connector is connected to the lower thrust block, and the upper part of the rotating connector is rotatably connected to the steering correction assembly. The rotating connector is used to make the steering correction assembly rotate relative to the lower thrust block about the axis of the rotating connector. The upper thrust block is fixedly mounted on the upper end of the steering correction assembly; The actuator end connector is fixed to the upper end of the upper thrust block and is used to connect with an external thrust actuator.

[0007] Furthermore, the frame has a trapezoidal frame structure.

[0008] Furthermore, one end of the diagonal brace is fixedly connected to the lower end of the extension section, and the other end is fixedly connected to the inclined side of the frame.

[0009] Furthermore, the rotating connector is a roller.

[0010] Furthermore, each end of the rotating connector is provided with an axial limiting component, which is a retaining ring or an end cap.

[0011] Furthermore, an anti-slip pad is provided between the clamping frame and the box girder to be tested.

[0012] Furthermore, the upper bottom of the frame is provided with at least two height-adjustable positioning bolts, which adjust the fit between the clamping frame and the box girder to be tested.

[0013] Furthermore, the upper bottom of the frame is provided with lifting lugs or lifting holes.

[0014] Furthermore, a triangular stiffening plate is provided at the connection between the diagonal brace and the extension section and the inclined side.

[0015] Furthermore, a set of torsion devices is installed before and after the box girder to be tested to achieve a torsion loading test in opposite directions.

[0016] Compared with the prior art, the beneficial effects of this utility model are: This invention incorporates a rotating connector between the lower thrust block and the steering correction assembly. This connector allows the direction of the loading thrust to be automatically adjusted according to the torsional state of the box girder under test. This ensures that the thrust remains essentially perpendicular to the clamping surface of the clamping frame and the box girder during loading, overcoming the problems of slight deviations in installation angle that cause the loading force to be difficult to maintain perpendicularity, resulting in force offset and localized stress concentration. This guarantees the accuracy and uniformity of torque transmission. When the torsion device is installed at both ends of the box girder, a double-ended opposing torsional loading structure can be formed, or it can be used independently at one end. This significantly improves the efficiency and reliability of the test while ensuring structural stability and accurate force application.

[0017] The clamping frame of this utility model adopts a trapezoidal frame with an extension section on the upper side. With the arrangement of diagonal braces and triangular stiffening plates, the stability of the extension section can be enhanced and deformation can be prevented during loading. The positioning bolts on the extension section and the anti-slip pads on the clamping surface improve the fit with the end face of the box girder and the reliability of the fixation. The frame of this utility model is provided with lifting lugs or lifting holes for easy hoisting and arrangement. Attached Figure Description

[0018] Figure 1This is a schematic diagram of the overall structure of an embodiment of the present utility model; Figure 2 This is a schematic diagram of the working state of an embodiment of this utility model; In the figure, 1-clamping frame, 2-diagonal brace, 3-lower thrust block, 4-steering correction component, 5-rotating connector, 6-upper thrust block, 7-actuator end connector, 8-box beam to be tested. Detailed Implementation

[0019] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0020] In the description of this patent, it should be understood that the terms “center,” “upper,” “lower,” “front,” “back,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this patent and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this patent.

[0021] In the description of this patent, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this patent according to the specific circumstances.

[0022] Example 1: like Figure 1 As shown, an adaptive torsion device for bridge load testing includes a clamping frame 1, a diagonal brace 2, a lower thrust block 3, a steering correction component 4, a rotating connector 5, an upper thrust block 6, and an actuator end connector 7, which is used for torsion load testing of bridge box girders.

[0023] The clamping frame 1 includes a frame body, which is generally trapezoidal in shape. The box girder 8 to be measured passes through the clamping frame 1, and its cross-sectional profile matches the trapezoidal frame structure of the clamping frame 1, thereby enabling the clamping frame 1 to provide stable positioning and constraint for the box girder 8. The upper side of the frame body extends to one side to form an extension section. The lower end of the extension section is fixedly connected to the diagonal brace 2, and the other end of the diagonal brace 2 is fixedly connected to the inclined side of the frame body. A triangular stiffening plate is provided at the connection between the extension section and the inclined side to enhance the overall rigidity and resistance to deformation. At least two height-adjustable positioning bolts are also provided at the upper bottom of the frame body to adjust the fit between the clamping frame 1 and the box girder 8 to be measured. Lifting lugs or lifting holes can be provided at the upper bottom of the frame body to facilitate the hoisting and arrangement of the device. Anti-slip pads are provided between the contact surfaces of the clamping frame 1 and the box girder 8 to increase friction and ensure clamping stability.

[0024] The lower thrust block 3 is fixedly disposed above the extension section, and its upper end face has a mounting groove for the rotating connector 5. The rotating connector 5 is a roller structure, with its lower part fixed in the mounting groove of the lower thrust block 3, and limiting members at both ends. The limiting members can be retaining rings or end caps, used to prevent axial movement of the rotating connector 5. The upper part of the rotating connector 5 is rotatably connected to the steering correction assembly 4, allowing the steering correction assembly 4 to rotate relative to the lower thrust block 3 around the axis of the rotating connector 5.

[0025] The upper thrust block 6 is fixedly mounted on the upper end of the steering correction assembly 4. The upper end face of the upper thrust block 6 is provided with a countersunk hole, and the actuator end connector 7 is fixed in the countersunk hole by bolts. The actuator end connector 7 is used to connect with an external thrust actuator to transmit the applied thrust to the torsion device of this embodiment.

[0026] During the test, the external thrust actuator applies a load to the upper thrust block 6 through the actuator end connector 7. The thrust is transmitted sequentially through the steering correction component 4, the rotating connector 5, and the lower thrust block 3 to the clamping frame 1, and then acts on the box girder 8 under test. When the box girder 8 under test undergoes torsional deformation, the steering correction component 4 can adjust the direction of the thrust accordingly, so that the loading force always acts basically perpendicularly on the clamping surface, thereby avoiding loading offset and local stress concentration, and ensuring the accuracy of torque transmission.

[0027] When the torsion device in this embodiment is used for torsion testing of bridge box girders, a torsional moment can be applied to the box girder by single-end loading, thereby simulating the torsional effect borne by the bridge structure under actual service conditions, obtaining the stress and deformation of the box girder under different working conditions, and providing reliable test basis for bridge design verification, construction quality assessment and load-bearing performance analysis.

[0028] Example 2: like Figure 2As shown, based on Example 1, this example arranges a set of adaptive torsion devices for bridge load testing at the front and rear ends of the box girder 8 to be tested. Each set of devices includes a clamping frame 1, a diagonal brace 2, a lower thrust block 3, a steering correction component 4, a rotating connector 5, an upper thrust block 6, and an actuator end connector 7. The structure and installation method are the same as in Example 1.

[0029] The front and front sections of the box girder 8 under test are respectively inserted into the clamping frames 1 of a set of bridge load test adaptive torsion devices, and the extensions of the two clamping frames 1 are respectively arranged on opposite sides of the box girder. Two external thrust actuators are respectively connected to the actuator end connectors 7 at the front and rear ends, and both are loaded in a vertically downward direction. Since the front and rear extensions are arranged in opposite directions, when the two actuators press down at the same time, the loading force is transmitted to the clamping frames 1 through their respective upper thrust blocks 6, steering correction components 4, rotating connectors 5 and lower thrust blocks 3, causing the box girder 8 under test to generate torques in opposite directions at the front and rear ends, thereby forming a twisted torsional deformation.

[0030] During the loading process, the steering correction component 4 and the rotating connector 5 of each device can automatically correct the direction of the thrust, so that the loading force always acts basically perpendicularly on the clamping surface, avoiding force deviation and local stress concentration caused by installation angle error, thereby ensuring the accuracy and reliability of the double-end torsion test.

[0031] The double-end arrangement described in this embodiment can more realistically simulate the double-end torsional load state of a bridge box girder under actual service conditions, which facilitates the study of its overall torsional performance and torsional stiffness, and provides experimental data support for bridge design and inspection.

[0032] For those skilled in the art, various improvements and modifications can be made without departing from the principles of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.

Claims

1. An adaptive torsion device for bridge load testing, characterized in that, include: Clamping frame (1), lower thrust block (3), steering correction assembly (4), rotating connector (5), upper thrust block (6) and actuator end connector (7); The clamping frame (1) includes a frame for accommodating the box beam (8) to be tested, and the upper side of the frame extends to one side to form an extension section; The downward thrust block (3) is fixedly disposed above the extension section; The upper end face of the lower thrust block (3) is provided with a mounting groove for a rotating connector (5). The lower part of the rotating connector (5) is connected to the lower thrust block (3), and the upper part of the rotating connector (5) is rotatably connected to the steering correction assembly (4). The rotating connector (5) is used to make the steering correction assembly (4) rotate relative to the lower thrust block (3) around the axis of the rotating connector (5). The upper thrust block (6) is fixedly installed at the upper end of the steering correction assembly (4); The actuator end connector (7) is fixed to the upper end of the upper thrust block (6) and is used to connect with an external thrust actuator.

2. The adaptive torsion device for bridge load testing according to claim 1, characterized in that, The frame has a trapezoidal frame structure.

3. The adaptive torsion device for bridge load testing according to claim 1, characterized in that, It also includes a diagonal brace (2), one end of which is fixedly connected to the lower end of the extension section, and the other end is fixedly connected to the inclined side of the frame.

4. The adaptive torsion device for bridge load testing according to claim 1, characterized in that, The rotating connector (5) is a roller.

5. The adaptive torsion device for bridge load testing according to claim 4, characterized in that, The rotating connector (5) is provided with axial limiting components at both ends, which are retaining rings or end caps.

6. The adaptive torsion device for bridge load testing according to claim 1, characterized in that, An anti-slip pad is provided between the clamping frame (1) and the box girder (8) to be tested.

7. The adaptive torsion device for bridge load testing according to claim 2, characterized in that, The upper bottom of the frame is provided with at least two height-adjustable positioning bolts, which adjust the fit between the clamping frame (1) and the box beam (8) to be tested.

8. The adaptive torsion device for bridge load testing according to claim 2, characterized in that, The frame is provided with lifting lugs or lifting holes on its upper bottom.

9. The adaptive torsion device for bridge load testing according to claim 3, characterized in that, A triangular stiffening plate is provided at the connection between the diagonal brace, the extension section, and the inclined side.

10. The adaptive torsion device for bridge load testing according to any one of claims 1-9, characterized in that, A set of torsion devices is set at the front and back of the box girder (8) to achieve a torsion loading test in opposite directions.

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