Road and bridge protection structure strength testing equipment

Abstract

The invention belongs to the technical field of bridge guardrail strength testing, and particularly relates to road bridge protection structure strength testing equipment which comprises a steel frame and a reaction wall, the steel frame is used for installing a guardrail plate, the guardrail plate is formed by splicing a plurality of plate bodies, the steel frame is composed of two cross beams and two vertical columns, and the reaction wall is arranged on the steel frame. Two ground beams are installed between the reaction wall and the steel frame, one side of the steel frame is connected with an MTS actuator, right-angle plates are installed at the positions, corresponding to the plate bodies, of the cross beams, high-strength bolts are installed between the right-angle plates and the plate bodies, and restraining steel bars are connected between the vertical columns. According to the invention, the accuracy of testing the strength of the bridge guardrail formed by splicing a plurality of plate bodies can be effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge guardrail strength testing, and particularly to a testing device for the strength of a road bridge protection structure. Background Art

[0002] With the application of assembly technology, in the prior art, the guardrails used for road bridge protection structures are usually formed by sequentially splicing and fixing multiple plate bodies to form the overall guardrail. For safety considerations, the seismic strength of bridge guardrails generally needs to be detected during production and application.

[0003] Referring to the Chinese patent with the patent publication number CN216594063U, a seismic detection device for precast concrete wall panels is disclosed, including a base. An installation groove is opened at the top of the base, and a moving plate is slidably connected to the inner wall of the installation groove. Installation plates are symmetrically and fixedly connected to the top of the moving plate near the left and right sides through bolts. A vibration mechanism is arranged at the bottom of the moving plate. Fixing mechanisms are respectively arranged on the surfaces of the two installation plates away from the base. The fixing mechanism includes an installation disk, and adjusting mechanisms are respectively arranged on the surfaces of the two installation disks away from the base.

[0004] However, in the prior art for seismic detection, generally only the shape of the wall panel is observed after applying an impact force, and the seismic detection of the bridge guardrail formed by splicing is not accurate and effective enough. Summary of the Invention

[0005] Based on the technical problems existing in the background art, the present invention proposes a testing device for the strength of a road bridge protection structure.

[0006] A testing device for the strength of a road bridge protection structure proposed by the present invention includes a steel frame and a reaction wall. The steel frame is used for installing guardrail plates, and the guardrail plates are formed by splicing multiple plate bodies. The steel frame is composed of two cross beams and two vertical columns. Two ground beams are installed between the reaction wall and the steel frame. An MTS actuator is connected to one side of the steel frame. Right-angle plates are installed at positions corresponding to each plate body on the cross beam. High-strength bolts are installed between the right-angle plates and the plate bodies. Constraint steel bars are connected between the vertical columns. A displacement sensor one is connected between the cross beam and the vertical column, a displacement sensor two is connected between the vertical column and the ground beam, a displacement sensor three is connected between the ground beam and the reaction wall, and strain gauges one are installed on both sides of the plate body below the high-strength bolts.

[0007] Furthermore, an installation frame is connected between the MTS actuator and the reaction wall. The installation frame is provided with an installation plate connected to the MTS actuator. Two connecting frames are rotatably connected to the bottom of the installation plate. Two vertically upward extending limiting frames are fixed at positions corresponding to the installation plate on the top of the reaction wall, and the installation plate slides vertically between the two limiting frames.

[0008] Furthermore, a chute is provided at the position of the reaction wall corresponding to the mounting frame. A screw rod is rotatably connected between the two ends of the chute. One end of the screw rod is connected to a rotating motor in a lip-moving manner. Two sliders are threadedly connected to the outer wall of the screw rod. The threads of the screw rod corresponding to the two sliders are arranged in opposite directions. The outer wall of the slider is slidably connected to the inner wall of the chute. The top of the slider is rotatably connected to the bottom end of the connecting frame. A first spring is connected between the two sliders.

[0009] Furthermore, a receiving groove is provided on one side of the chute close to the steel frame. At the middle position on one side of the receiving groove close to the chute, two vertically arranged third shaft rods are fixed. A limiting plate is rotatably connected to the outer wall of the third shaft rod. A second spring which is bent is connected between the side walls of the two limiting plates away from the chute. A baffle is installed at the top of the receiving groove. Under normal conditions, the side walls of the two limiting plates close to the chute are horizontally arranged.

[0010] Furthermore, the cross beam adopts a C-shaped steel structure with the opening facing the vertical column, and the vertical column adopts a C-shaped steel structure with the opening facing the cross beam. Vertically equidistantly distributed clamping grooves are provided at the end of the vertical column facing the cross beam. The opening width of the cross beam is at least twice the distance between adjacent clamping grooves.

[0011] Furthermore, two auxiliary plates are fixed at the position of the inner wall of the cross beam corresponding to the vertical column. The two auxiliary plates are respectively in sliding contact with the inner walls on both sides of the corresponding same vertical column. Through holes are provided on the side walls of the auxiliary plates. The clamping groove is provided with a horizontal part, and a perforated part is provided at the position of the horizontal part corresponding to the through hole. A corresponding auxiliary steel bar is provided on the cross beam. The auxiliary steel bar horizontally passes through the perforated part and the through hole. Nuts one are installed at both ends of the auxiliary steel bar outside the vertical column.

[0012] Furthermore, an auxiliary support plate is fixed at the inner wall of the vertical column below the clamping groove. The auxiliary support plate is located between the two auxiliary plates. A strain gauge two is provided at the position of the vertical column beside the nut one.

[0013] Furthermore, a through groove is provided at the position of the bottom of the cross beam corresponding to the right-angle plate. The through groove extends horizontally, and the horizontal extension direction of the through groove is perpendicular to the horizontal extension of the cross beam. An extension rod which is in sliding contact with the inner wall of the through groove is fixed at the top of the right-angle plate. A nut two is threadedly connected to the outer wall of the extension rod inside the cross beam.

[0014] Furthermore, a pull ring is fixed at the top end of the extension rod. A chain is provided between the pull ring and the auxiliary steel bar. A first hook ring is fixed at the end of the chain facing the pull ring, and a second hook ring is fixed at the end of the chain facing the auxiliary steel bar.

[0015] The beneficial effects in the present invention are as follows: In the present invention, displacement control loading is carried out at a constant rate by an MTS actuator, and the loading displacement is continuously increased. Through the arrangement of multiple displacement sensors and strain gauge 1, the displacement of the beam-column joint area, the load at the fixed position of the guardrail plate, and the structural deformation condition of the guardrail plate are observed, so as to effectively test the strength of the bridge guardrail under different vibration conditions, and improve the accuracy and effectiveness of the strength test of the bridge guardrail composed of multiple plate bodies.

[0016] In the present invention, the stability of the connection between the MTS actuator and the reaction wall is improved through the connecting frame with two bifurcated structures below the installation position of the MTS actuator and the spring 1 connected therebetween, as well as the buffering effect during the transmission of the mechanical vibration of the MTS actuator itself to the reaction wall, avoiding the displacement effect on the guardrail at the steel frame position from different positions, thereby improving the accuracy of the seismic strength test of the bridge guardrail.

[0017] In the present invention, it can be applied to the situation where the thickness difference at each position of the guardrail plate affects the installation, so as to ensure the applicability and convenient adjustment of the test equipment, and for large guardrail plates, it can ensure the firmness of the steel frame while being conveniently adjusted to ensure the accuracy of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of a strength test device for a road and bridge protection structure proposed in Embodiment 1 of the present invention; Figure 2 It is a schematic diagram of the back structure of the steel frame of a strength test device for a road and bridge protection structure proposed in Embodiment 1 of the present invention; Figure 3 It is a schematic diagram of the installation frame structure of a strength test device for a road and bridge protection structure proposed by the present invention; Figure 4 It is a schematic diagram of the position structure of the chute and the receiving groove of a strength test device for a road and bridge protection structure proposed by the present invention; Figure 5 It is a schematic diagram of the overall structure of a strength test device for a road and bridge protection structure proposed in Embodiment 2 of the present invention; Figure 6 It is a schematic diagram of the back structure of the steel frame of a strength test device for a road and bridge protection structure proposed in Embodiment 2 of the present invention; Figure 7 It is a schematic diagram of the connection position between the cross beam and the vertical column of a strength test device for a road and bridge protection structure proposed in Embodiment 2 of the present invention; Figure 8 It is a schematic diagram of the partial structure of the vertical column of a strength test device for a road and bridge protection structure proposed in Embodiment 2 of the present invention; Figure 9Schematic diagram of the partial structure of the cross beam of a road and bridge protection structure strength testing device proposed in Embodiment 2 of the present invention; Figure 10 Schematic diagram of the position structure of the right-angled plate of a road and bridge protection structure strength testing device proposed in Embodiment 2 of the present invention.

[0019] In the figure: 1 guardrail plate, 2 MTS actuator, 3 reaction wall, 301 chute, 302 receiving groove, 4 ground beam, 5 right-angled plate, 6 high-strength bolt, 7 mounting bracket, 8 restraint reinforcement, 9 screw rod, 10 rotating motor, 11 slider, 111 first shaft rod, 12 connecting frame, 13 mounting plate, 131 second shaft rod, 14 limiting frame, 15 first spring, 16 third shaft rod, 17 limiting plate, 18 second spring, 19 baffle, 20 cross beam, 21 vertical column, 22 clamping groove, 221 horizontal part, 222 perforated part, 23 auxiliary plate, 24 auxiliary reinforcement, 25 first nut, 26 auxiliary support plate, 27 through groove, 28 extension rod, 29 second nut, 30 pull ring, 31 first hook ring, 32 second hook ring, 33 chain. Detailed implementation manners

[0020] Refer to Figures 1 - 10 , a road and bridge protection structure strength testing device, including a steel frame and a reaction wall 3. The steel frame is used for installing the guardrail plate 1. The guardrail plate 1 is composed of a plurality of vertically extending plate bodies spliced together. The steel frame is a rectangular structure composed of two cross beams 20 and two vertical columns 21. Two ground beams 4 are installed between the reaction wall 3 and the steel frame. An MTS actuator 2 is connected to one side of the steel frame. It should be noted that: the cross beam 20 is installed at the position between the vertical column 21 and the guardrail plate 1, and the MTS actuator 2 is connected to one of the vertical columns 21; right-angled plates 5 are installed at the positions corresponding to each plate body on the cross beam 20. High-strength bolts 6 are installed between the right-angled plate 5 and the plate body. Restraint reinforcements 8 are connected between the vertical columns 21. Under the action of the reaction wall 3 and the restraint reinforcements 8, it can ensure that the loading position is more accurate and the structural system is more stable during the loading process; A displacement sensor one is connected between the cross beam 20 and the vertical column 21. The displacement sensor one is used to monitor the slip value between the cross beam 20 and the vertical column 21. A displacement sensor two is connected between the vertical column 21 and the ground beam 4. The displacement sensor two is used to monitor the slip value between the vertical column 21 and the ground beam 4. A displacement sensor three is connected between the ground beam 4 and the reaction wall 3. The displacement sensor three is used to monitor the slip value between the ground beam 4 and the reaction wall 3. A displacement sensor four is connected to the MTS actuator 2. The displacement sensor four is used to monitor the displacement value during the loading process of the MTS actuator 2. Strain gauges one are installed on both sides of the plate body below the high-strength bolts 6, which are used to monitor the force condition at the position of the high-strength bolts 6 during the loading process; thus, before the test, the guardrail plate 1 composed of multiple plate bodies is installed on the steel frame through the right-angle plate 5 and the high-strength bolts 6, and the strain gauges one are installed and connected. During the test process, the displacement control loading is carried out at a constant rate by the MTS actuator 2 and the loading displacement is continuously increased. Through the setting of multiple displacement sensors and the strain gauges one, the displacement of the beam-column joint area, the load at the fixed position of the guardrail plate 1, and the structural deformation condition of the guardrail plate 1 are observed, so as to effectively test the strength of the bridge guardrail under different vibration conditions and improve the accuracy and effectiveness of the strength test of the bridge guardrail spliced by multiple plate bodies.

[0021] In the present invention, an installation frame 7 is connected between the MTS actuator 2 and the reaction wall 3. The installation frame 7 is provided with a mounting plate 13 connected to the MTS actuator 2. A second shaft rod 131 is fixed to the bottom of the mounting plate 13. Two connecting frames 12 are rotatably connected to the outer wall of the second shaft rod 131. At the position corresponding to the mounting plate 13 on the top of the reaction wall 3, two vertically extending limiting frames 14 are fixed. The mounting plate 13 slides vertically between the two limiting frames 14. A chute 301 is formed at the position of the reaction wall 3 corresponding to the installation frame 7. A screw rod 9 is rotatably connected between the two ends of the chute 301. One end of the screw rod 9 is connected to a rotating motor 10 in a lip-moving manner. Two sliders 11 are threadedly connected to the outer wall of the screw rod 9. The threads of the screw rod 9 corresponding to the two sliders 11 are arranged in opposite directions, so that when the screw rod 9 rotates, the two sliders 11 can move horizontally in opposite directions to approach or move away from each other. The outer wall of the slider 11 is slidably connected to the inner wall of the chute 301. A first shaft rod 111 is fixed to the top of the slider 11. The first shaft rod 111 is rotatably connected to the bottom end of the connecting frame 12. A first spring 15 is connected between the two sliders 11. Therefore, when testing the seismic strength of guardrails of different sizes, steel frames of different sizes will be used. By driving the screw rod 9 to rotate, the mounting plate 13 and the MTS actuator 2 can be lifted for testing, or the position of the MTS actuator 2 can be adjusted according to requirements to load displacement, thereby improving the adaptability of the test. And the stability of the connection between the MTS actuator 2 and the reaction wall 3 is improved by the two bifurcated connecting frames 12 below the installation position of the MTS actuator 2 and the first spring 15 connected therebetween, as well as the buffering effect during the transmission of the mechanical vibration of the MTS actuator 2 itself to the reaction wall 3, avoiding the displacement effect on the guardrails at different positions of the steel frame, thereby improving the accuracy of the seismic strength test of the bridge guardrail.

[0022] In the present invention, a receiving groove 302 is formed on one side of the sliding groove 301 close to the steel frame. At the middle position on one side of the receiving groove 302 close to the sliding groove 301, two vertically arranged third shafts 16 are fixed. The outer wall of the third shaft 16 is rotatably connected with a limiting plate 17. A same bent second spring 18 is connected between the side walls of the two limiting plates 17 away from the sliding groove 301. A baffle 19 is installed at the top of the receiving groove 302 to block the upward bending of the second spring 18. It should be noted that: the two limiting plates 17 can deflect towards the inner side of the receiving groove 302 around the corresponding third shafts 16, and a notch is arranged at the edge of the end of the limiting plate 17 away from the third shaft 16, and a clamping block corresponding to the notch position is arranged at the position of the end of the receiving groove 302 close to the sliding groove 301, so that the side walls of the two limiting plates 17 close to the sliding groove 301 are horizontally arranged in the normal state, and the side wall of the limiting plate 17 close to the sliding groove 301 is in sliding contact with the outer wall of the slider 11. Thus, when the mechanical vibration of the MTS actuator 2 itself is transmitted from the mounting frame 7 towards the reaction wall 3, the connecting frame 12 with a shear structure and the first spring 15 are used to disperse and buffer the acting forces in both end directions, and the limiting plate 17 on the side and the second spring 18 connecting the two limiting plates 17 are used to offset and buffer the acting forces on the side, thereby reducing the influence of the mechanical vibration of the MTS actuator 2 itself on the test.

[0023] A method for testing the strength of a road and bridge protection structure includes the following steps: Step 1: Complete the construction of the steel frame and adjust the steel frame according to the size of the guardrail to be tested, and correspondingly arrange displacement sensors on the steel frame; Step 2: Bond a plurality of plate bodies together to form a guardrail plate 1 on the front side with a special seam adhesive, and install the guardrail plate 1 on the steel frame through a corresponding plurality of right-angle plates 5 and high-strength bolts 6; Step 3: Install strain gauges below the high-strength bolts 6 on both sides of the plate body; Step 4: The MTS actuator 2 is used to perform displacement control loading at a constant rate and the loading displacement is continuously increased. Through the settings of a plurality of displacement sensors and strain gauges, the displacement of the beam-column joint area and the load at the fixed position of the guardrail plate 1 are observed, and the structural deformation condition of the guardrail plate 1 is observed with the naked eye.

[0024] Based on the above test equipment and test method, based on the assembly method of the steel frame and the installation method of the steel frame and the right-angle plate 5, the following different implementation manners can be adopted: Embodiment 1: Refer to Figures 1 - 2, a strength testing device for road and bridge protection structures. The crossbeam 20 and the vertical column 21 are welded together, and the right-angle plate 5 is welded to the crossbeam 20. This installation method is simple and can ensure the firmness of the steel frame. However, the steel frame of this structure is generally only used for targeted testing of large guardrail plates. After the steel frame is assembled, it is difficult to adjust according to the actual situation and needs to be demolished and rebuilt after the test, resulting in low applicability.

[0025] Embodiment 2: Refer to Figures 5 - 10 , a strength testing device for road and bridge protection structures. The crossbeam 20 is made of a C-shaped steel structure with an opening facing the vertical column 21, and the vertical column 21 is made of a C-shaped steel structure with an opening facing the crossbeam 20. The end of the vertical column 21 facing the crossbeam 20 is provided with slots 22 evenly distributed in the vertical direction. The opening width of the crossbeam 20 is at least twice the distance between adjacent slots 22. That is, when the upper and lower edges of the crossbeam 20 are inserted into two slots 22, there is at least one slot 22 in the middle area of the opening of the crossbeam 20. Two auxiliary plates 23 are fixed at the positions of the crossbeam 20 corresponding to the inner wall of the vertical column 21. The two auxiliary plates 23 are in sliding contact with the inner walls on both sides of the corresponding vertical column 21 respectively. That is, after the crossbeam 20 is inserted, the two auxiliary plates 23 just slide into along the inner wall of the corresponding vertical column 21. Through holes are provided on the side walls of the auxiliary plates 23. The slots 22 are provided with a horizontal part 221 that is in sliding contact with the edge of the crossbeam 20. A perforated part 222 is provided at the position of the horizontal part 221 corresponding to the through hole. A corresponding auxiliary steel bar 24 is provided on the crossbeam 20. The auxiliary steel bar 24 horizontally passes through the perforated part 222 and the through hole. Nuts 25 are installed on the outer sides of both ends of the auxiliary steel bar 24 on the vertical column 21. During the process of assembling the steel frame, the position of the upper crossbeam 20 can be adjusted according to the different heights and sizes of the actual guardrail plate 1, and the upper crossbeam 20 is correspondingly inserted into slots 22 of different heights. After the crossbeam 20 is completely inserted, the through holes of the auxiliary plates 23 on the crossbeam 20 just correspond to the positions of the perforated parts 222, and then the auxiliary steel bar 24 is inserted and the auxiliary steel bar 24 is limited and fixed by the nuts 25 at both ends; through the auxiliary steel bar 24 and the auxiliary plates 23, the firmness between the crossbeam 20 and the vertical column 21 can be effectively ensured under normal conditions, and only by the nuts 25 at both ends, it is convenient to quickly adjust the size of the installation area of the steel frame, and on the basis of being able to achieve quick adjustment, ensure the basic firmness of the steel frame and avoid affecting the test of the guardrail plate 1.

[0026] In the present invention, an auxiliary support plate 26 is fixed below the clamping groove 22 on the inner wall of the vertical column 21. The auxiliary support plate 26 is located between the two auxiliary plates 23. When the cross beam 20 is inserted into the clamping groove 22, the bottom outer wall and the top inner wall of the cross beam 20 are in sliding contact with the top of the auxiliary support plate 26 at the corresponding positions, thereby improving the bearing capacity of the vertical column 21 for the cross beam 20. A strain gauge two is arranged at the side position of the vertical column 21 beside the nut one 25 to monitor the load change at both ends of the auxiliary steel bar 24, and the accuracy of the test is improved by mutually verifying the monitoring values of the strain gauge two and the displacement sensor one.

[0027] In the present invention, a through groove 27 is formed at the position corresponding to the right-angle plate 5 at the bottom of the cross beam 20. The through groove 27 extends horizontally, and the horizontal extension direction of the through groove 27 is perpendicular to the horizontal extension of the cross beam 20. An extension rod 28 that is in sliding contact with the inner wall of the through groove 27 is fixed to the top of the right-angle plate 5. A nut two 29 is threadedly connected to the outer wall of the extension rod 28 inside the cross beam 20, so that the position of the right-angle plate 5 can be moved along the extension direction of the through groove 27, thereby adjusting the protruding distance of the right-angle plate 5 according to the thickness difference of the plate body at different upper and lower positions to ensure the effectiveness of the vertical and positive installation of the guardrail plate 1 and avoid affecting the test accuracy due to installation deformation caused by the thickness difference at each position of the guardrail plate 1. A pull ring 30 is fixed to the top end of the extension rod 28. A chain 33 is arranged between the pull ring 30 and the auxiliary steel bar 24. A hook ring one 31 is fixed to the end of the chain 33 facing the pull ring 30, and a hook ring two 32 is fixed to the end of the chain 33 facing the auxiliary steel bar 24. Both the hook ring one 31 and the hook ring two 32 are openable ring structures. By buckling between the hook ring one 31 and the pull ring 30 and buckling the hook ring two 32 at different positions of the auxiliary steel bar 24 to tighten the chain 33, the stability and effectiveness of the extension rod 28 and the right-angle plate 5 for fixing at each position of the through groove 27 are ensured, thereby ensuring the applicability and accuracy of the seismic resistance test of the guardrail plate 1.

[0028] The method of this embodiment can be quickly adjusted and used for small guardrail plates, large guardrail plates, or other guardrail plates with different heights, and can also be applicable to the situation where the thickness difference at each position of the guardrail plate affects the installation, thereby ensuring the applicability and adjustment convenience of the test equipment. For large guardrail plates, while being convenient to adjust, the firmness of the steel frame can be ensured to guarantee the accuracy of the test.

[0029] Embodiment 3: A test device for the strength of a road and bridge protection structure. The contact position between the cross beam 20 and the vertical column 21 is detachably fixed by a connecting plate and bolts. This is only suitable for testing small bridge guardrails and can be quickly disassembled for adjustment. When testing larger guardrail plates, a small number of bolts are difficult to ensure firm fixation, and a large number of bolts will result in too many disassembly operations and inconvenience for replacement and adjustment.

[0030] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes should be covered within the protection scope of the present invention.

Claims

1. A strength testing device for a road bridge protection structure, comprising a steel frame and a reaction wall (3), the steel frame is used for installing guardrail plates (1), the guardrail plates (1) are composed of a plurality of plate bodies spliced together, the steel frame is composed of two cross beams (20) and two vertical columns (21), characterized in that, There are two ground beams (4) installed between the reaction wall (3) and the steel frame. One side of the steel frame is connected with an MTS actuator (2). Right-angle plates (5) are installed at positions corresponding to each plate body on the cross beam (20). High-strength bolts (6) are installed between the right-angle plates (5) and the plate bodies. Restraining steel bars (8) are connected between the vertical columns (21). A first displacement sensor is connected between the cross beam (20) and the vertical column (21). A second displacement sensor is connected between the vertical column (21) and the ground beam (4). A third displacement sensor is connected between the ground beam (4) and the reaction wall (3). Strain gauges one are installed on both sides of the plate body below the high-strength bolts (6).

2. The strength testing device for a road and bridge protection structure according to claim 1, characterized in that, An installation frame (7) is connected between the MTS actuator (2) and the reaction wall (3). The installation frame (7) is provided with a mounting plate (13) connected to the MTS actuator (2). Two connecting frames (12) are rotatably connected to the bottom of the mounting plate (13). Two vertically extending limiting frames (14) are fixed at positions corresponding to the mounting plate (13) on the top of the reaction wall (3). The mounting plate (13) slides vertically between the two limiting frames (14).

3. The strength testing device for a road and bridge protection structure according to claim 2, characterized in that, A chute (301) is opened at the position of the reaction wall (3) corresponding to the installation frame (7). A screw rod (9) is rotatably connected between the two ends of the chute (301). One end of the screw rod (9) is in driving connection with a rotating motor (10). Two sliders (11) are threadedly connected to the outer wall of the screw rod (9). The threads of the screw rod (9) corresponding to the two sliders (11) are arranged in opposite directions. The outer wall of the slider (11) is in sliding connection with the inner wall of the chute (301). The top of the slider (11) is rotatably connected to the bottom end of the connecting frame (12). A first spring (15) is connected between the two sliders (11).

4. The strength testing device for a road and bridge protection structure according to claim 3, characterized in that, A receiving groove (302) is opened on one side of the chute (301) close to the steel frame. Two vertically arranged third shaft rods (16) are fixed at the middle position on one side of the receiving groove (302) close to the chute (301). A limiting plate (17) is rotatably connected to the outer wall of the third shaft rod (16). A second spring (18) which is bent is connected between the side walls of the two limiting plates (17) far away from the chute (301). A baffle (19) is installed at the top of the receiving groove (302). Under normal conditions, the side walls of the two limiting plates (17) close to the chute (301) are horizontally arranged.

5. A strength testing device for a road and bridge protection structure according to any one of claims 1 to 4, characterized in that, The cross beam (20) adopts a C-shaped steel structure with the opening facing the vertical column (21). The vertical column (21) adopts a C-shaped steel structure with the opening facing the cross beam (20). Vertical slots (22) are opened at equal intervals in the vertical direction at the end of the vertical column (21) facing the cross beam (20). The opening width of the cross beam (20) is at least twice the distance between adjacent slots (22).

6. The strength testing device for a road and bridge protection structure according to claim 5, characterized in that, Two auxiliary plates (23) are fixed at positions corresponding to the vertical column (21) on the inner wall of the cross beam (20). The two auxiliary plates (23) are respectively in sliding contact with the inner walls on both sides of the corresponding same vertical column (21). Through holes are opened on the side walls of the auxiliary plates (23).

7. The strength testing device for a road and bridge protection structure according to claim 6, characterized in that, The card slot (22) is provided with a horizontal portion (221), and a perforated portion (222) is formed at a position corresponding to the through hole in the horizontal portion (221). The cross beam (20) is correspondingly provided with an auxiliary steel bar (24). The auxiliary steel bar (24) horizontally passes through the perforated portion (222) and the through hole, and nuts one (25) are installed on the outer sides of both ends of the auxiliary steel bar (24) and located on the vertical columns (21).

8. An intensity testing device for a road and bridge protection structure according to claim 7, characterized in that, An auxiliary support plate (26) is fixed to the inner wall of the vertical column (21) below the card slot (22). The auxiliary support plate (26) is located at a position between the two auxiliary plates (23). A strain gauge two is arranged at a position beside the nut one (25) on the vertical column (21).

9. The strength testing device for a road and bridge protection structure according to claim 7, characterized in that, A through slot (27) is formed at a position corresponding to the right-angle plate (5) at the bottom of the cross beam (20). The through slot (27) extends horizontally, and the horizontal extension direction of the through slot (27) is perpendicular to the horizontal extension of the cross beam (20). An extension rod (28) that is in sliding contact with the inner wall of the through slot (27) is fixed to the top of the right-angle plate (5). A nut two (29) is threadedly connected to the outer wall of the extension rod (28) within the cross beam (20).

10. The strength testing device for a road and bridge protection structure according to claim 9, characterized in that, A pull ring (30) is fixed to the top end of the extension rod (28). A chain (33) is arranged between the pull ring (30) and the auxiliary steel bar (24). A hook ring one (31) is fixed to one end of the chain (33) facing the pull ring (30), and a hook ring two (32) is fixed to one end of the chain (33) facing the auxiliary steel bar (24).

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