A road bridge protective structure strength testing equipment

Abstract

The present invention belongs to the technical field of bridge guardrail strength testing, and in particular, relates to a strength testing device for road bridge protective structures. The device comprises a steel frame and a reaction wall. The steel frame is used to mount guardrail panels, which are composed of multiple panels. The steel frame is composed of two crossbeams 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 on the crossbeams at positions corresponding to each panel. High-strength bolts are installed between the right-angle plates and the panels. Constraint steel bars are connected between the vertical columns. The present invention can effectively improve the accuracy of strength testing of bridge guardrails composed of multiple panels.

Description

Technical Field

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

[0002] With the application of assembly technology, guardrails used in road bridge protection structures in the existing technology are usually composed of multiple plates that are spliced ​​and fixed in sequence to form the guardrail as a whole. For safety reasons, bridge guardrails generally need to be tested for seismic strength during production and application.

[0003] Referring to the Chinese patent with patent publication number CN216594063U, a precast concrete wall panel seismic resistance detection device is disclosed, including a base, a mounting groove is provided on the top of the base, a movable plate is slidably connected to the inner wall of the mounting groove, the top of the movable plate near the left and right sides is symmetrically fixed with mounting plates by bolts, a vibration mechanism is provided at the bottom of the movable plate, and a fixing mechanism is respectively provided on the side surface of the two mounting plates away from the base, the fixing mechanism includes a mounting plate, and the side surface of the two mounting plates away from the base is respectively provided with an adjustment mechanism.

[0004] However, in the prior art, seismic resistance testing generally only considers observing the shape of the wall panels after applying an impact force, which is not accurate and effective enough for seismic resistance testing of spliced ​​bridge guardrails. Summary of the Invention

[0005] Based on the technical problems existing in the background technology, the present invention proposes a road bridge protective structure strength testing device.

[0006] The present invention proposes a road bridge protective structure strength testing device, which includes a steel frame and a reaction wall. The steel frame is used to install a guardrail plate, which is composed of 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 body. Constraint steel bars are connected between the vertical columns. Displacement sensor 1 is connected between the cross beam and the vertical columns, displacement sensor 2 is connected between the vertical column and the ground beam, and displacement sensor 3 is connected between the ground beam and the reaction wall. Strain gauge 1 is installed on both sides of the plate body below the high-strength bolts.

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

[0008] Furthermore, a sliding groove is provided at the position corresponding to the reaction wall and the mounting frame, a screw is rotatably connected between the two ends of the sliding groove, one end of the screw is transmission-connected to a rotating motor, the outer wall of the screw is threadedly connected to two sliders, the threads corresponding to the screw and the two sliders are set in opposite directions, the outer wall of the slider is slidingly connected to the inner wall of the sliding groove, the top of the slider is rotatably connected to the bottom end of the connecting frame, and a spring is connected between the two sliders.

[0009] Furthermore, a receiving groove is provided on the side of the slide close to the steel frame, and two vertically placed shaft rods three are fixed in the middle position of the side of the receiving groove close to the slide, and the outer wall of the shaft rod three is rotatably connected to a limit plate, and a spring two with the same curved setting is connected between the two limit plates away from the side wall of the slide, and a baffle is installed on the top of the receiving groove. Under normal conditions, the two limit plates are horizontally arranged close to the side wall of the slide.

[0010] Furthermore, the crossbeam adopts a C-shaped steel structure with an opening toward the vertical column, and the vertical column adopts a C-shaped steel structure with an opening toward the crossbeam. The vertical column has slots equally distributed in the vertical direction at the end facing the crossbeam, and the opening width of the crossbeam is at least twice the distance between two adjacent slots.

[0011] Furthermore, two auxiliary plates are fixed at positions corresponding to the inner wall of the crossbeam and the vertical column, and the two auxiliary plates are in sliding contact with the inner walls on both sides of the corresponding vertical column respectively. A through hole is provided on the side wall of the auxiliary plate, and the slot is provided with a horizontal portion, and a perforated portion is provided at a position corresponding to the through hole of the horizontal portion. An auxiliary steel bar is provided corresponding to the crossbeam, and the auxiliary steel bar passes through the perforated portion and the through hole horizontally, and nuts are installed at both ends of the auxiliary steel bar on the outside of the vertical column.

[0012] Furthermore, an auxiliary support plate is fixed to the inner wall of the vertical column below the card slot, and the auxiliary support plate is located between the two auxiliary plates. The vertical column is located next to the nut one and the strain gauge two.

[0013] Furthermore, a through slot is provided at a position corresponding to the bottom of the beam and the right-angle plate, the through slot extends horizontally, and the horizontal extension direction of the through slot is perpendicular to the horizontal extension of the beam. An extension rod is fixed to the top of the right-angle plate and is in sliding contact with the inner wall of the through slot. The outer wall of the extension rod is located inside the beam and is threadedly connected to nut 2.

[0014] Furthermore, a pull ring is fixed to the top of the extension rod, a chain is provided between the pull ring and the auxiliary steel bar, a hook ring 1 is fixed to one end of the chain facing the pull ring, and a hook ring 2 is fixed to one end of the chain facing the auxiliary steel bar.

[0015] The beneficial effects of the present invention are:

[0016] In the present invention, displacement-controlled loading is performed at a constant rate by an MTS actuator, and the loaded displacement is continuously increased. Through the arrangement of multiple displacement sensors and strain gauges, the displacement of the beam-column node area, the load at the fixed position of the guardrail plate, and the structural deformation of the guardrail plate are observed, thereby effectively testing the strength of the bridge guardrail under different vibration conditions, thereby improving the accuracy and effectiveness of the strength test of the bridge guardrail composed of multiple plates.

[0017] In the present invention, two bifurcated connecting frames below the MTS actuator installation location and the springs connected therebetween are used to improve the stability of the connection between the MTS actuator and the reaction wall, as well as to provide a buffering effect during the transmission of the MTS actuator's own mechanical vibration to the reaction wall, thereby avoiding displacement of the guardrail at different positions on the steel frame, thereby improving the accuracy of the seismic strength test of the bridge guardrail.

[0018] The present invention can be applied to situations where the thickness differences at various locations of the guardrail affect installation, thereby ensuring the applicability and adjustment convenience of the test equipment. Moreover, for large guardrails, it can ensure the firmness of the steel frame while facilitating adjustment to ensure the accuracy of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of a road and bridge protective structure strength testing device proposed in Example 1 of the present invention;

[0020] Figure 2 This is a schematic diagram of the back structure of a steel frame of a road and bridge protective structure strength testing device proposed in Example 1 of the present invention;

[0021] Figure 3 This is a schematic diagram of the mounting frame structure of a road and bridge protective structure strength testing device proposed by the present invention;

[0022] Figure 4 This is a schematic diagram of the position structure of the slideway and the receiving groove of a road and bridge protective structure strength testing device proposed by the present invention;

[0023] Figure 5 This is a schematic diagram of the overall structure of a road and bridge protective structure strength testing device proposed in Example 2 of the present invention;

[0024] Figure 6 This is a schematic diagram of the back structure of a steel frame of a road and bridge protective structure strength testing device proposed in Example 2 of the present invention;

[0025] Figure 7 This is a schematic diagram of the connection position structure of the beams and vertical columns of a road bridge protective structure strength testing device proposed in Example 2 of the present invention;

[0026] Figure 8 This is a schematic diagram of the partial structure of a vertical column of a road and bridge protective structure strength testing device proposed in Example 2 of the present invention;

[0027] Figure 9 This is a schematic diagram of the partial structure of a beam of a road and bridge protective structure strength testing device proposed in Example 2 of the present invention;

[0028] Figure 10 This is a schematic diagram of the right-angle plate position structure of a road and bridge protective structure strength testing device proposed in Example 2 of the present invention.

[0029] In the figure: 1 guardrail plate, 2 MTS actuator, 3 reaction wall, 301 slide, 302 receiving groove, 4 ground beam, 5 right-angle plate, 6 high-strength bolt, 7 mounting frame, 8 restraining steel bar, 9 screw, 10 rotating motor, 11 slider, 111 shaft rod 1, 12 connecting frame, 13 mounting plate, 131 shaft rod 2, 14 limit frame, 15 spring 1, 16 shaft rod 3, 17 limit plate, 18 spring 2, 19 baffle, 20 crossbeam, 21 vertical column, 22 slot, 221 horizontal part, 222 perforated part, 23 auxiliary plate, 24 auxiliary steel bar, 25 nut 1, 26 auxiliary support plate, 27 through slot, 28 extension rod, 29 nut 2, 30 pull ring, 31 hook ring 1, 32 hook ring 2, 33 chain. DETAILED DESCRIPTION

[0030] Reference Figures 1-10 , a road bridge protective structure strength testing equipment, including a steel frame and a reaction wall 3, the steel frame is used to install a guardrail plate 1, the guardrail plate 1 is composed of a plurality of vertically extending plate bodies, 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, and an MTS actuator 2 is connected to one side of the steel frame. It should be noted that: the cross beam 20 is installed 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-angle plates 5 are installed at the position 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 body, and restraint steel bars 8 are connected between the vertical columns 21. Under the action of the reaction wall 3 and the restraint steel bars 8, the loading position can be more accurate and the structural system can be more stable during the loading process;

[0031] A displacement sensor 1 is connected between the horizontal beam 20 and the vertical column 21, and the displacement sensor 1 is used to monitor the slip value between the horizontal beam 20 and the vertical column 21. A displacement sensor 2 is connected between the vertical column 21 and the ground beam 4, and the displacement sensor 2 is used to monitor the slip value between the vertical column 21 and the ground beam 4. A displacement sensor 3 is connected between the ground beam 4 and the reaction wall 3, and the displacement sensor 3 is used to monitor the slip value between the ground beam 4 and the reaction wall 3. A displacement sensor 4 is connected to the MTS actuator 2, and the displacement sensor 4 is used to monitor the displacement value of the MTS actuator 2 during loading. Strain gauges 1 are installed on both sides of the plate below the high-strength bolts 6 to monitor the position of the high-strength bolts 6. The stress conditions during the loading process are determined; therefore, before the test, the guardrail plate 1 composed of multiple plates is installed on the steel frame through the right-angle plate 5 and the high-strength bolt 6, and the strain gauge 1 is installed and connected. During the test, the MTS actuator 2 is used to perform displacement-controlled loading at a constant rate and the loading displacement continues to increase. Through the setting of multiple displacement sensors and the strain gauge 1, the displacement of the beam-column node area, the fixed position load of the guardrail plate 1, and the structural deformation of the guardrail plate 1 are observed, thereby effectively testing the strength of the bridge guardrail under different vibration conditions, thereby improving the accuracy and effectiveness of the strength test of the bridge guardrail composed of multiple plates.

[0032] In the present invention, a mounting frame 7 is connected between the MTS actuator 2 and the reaction wall 3, and the mounting frame 7 is provided with a mounting plate 13 connected to the MTS actuator 2. A second shaft 131 is fixed to the bottom of the mounting plate 13, and the outer wall of the second shaft 131 is rotatably connected to two connecting frames 12. Two vertically upward extending limit frames 14 are fixed to the position corresponding to the top of the reaction wall 3 and the mounting plate 13. The mounting plate 13 slides vertically between the two limit frames 14, and a slide groove 301 is provided at the position corresponding to the reaction wall 3 and the mounting frame 7. A screw rod 9 is rotatably connected between the two ends of the slide groove 301, and one end of the screw rod 9 is transmission-connected to a rotating motor 10. The outer wall of the screw rod 9 is threadedly connected to two sliders 11, and the threads corresponding to the screw rod 9 and the two sliders 11 are set 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, and the outer wall of the slider 11 is slidably connected to the inner wall of the slide groove 301 A shaft 111 is fixed to the top of the slider 11, and the shaft 111 is rotatably connected to the bottom end of the connecting frame 12. A spring 15 is connected between the two sliders 11, so that when conducting seismic strength tests on guardrails of different sizes, steel frames of different sizes will be used. By driving the screw 9 to rotate, the mounting plate 13 and the MTS actuator 2 can be raised and lowered for testing, or the position of the MTS actuator 2 can be adjusted as needed to load displacement, thereby improving the adaptability of the test; and the two forked connecting frames 12 below the installation position of the MTS actuator 2 and the spring 15 connected therebetween can improve the stability of the connection between the MTS actuator 2 and the reaction wall 3, as well as the buffering effect of the mechanical vibration of the MTS actuator 2 itself in the process of being transmitted to the reaction wall 3, thereby 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.

[0033] The present invention provides a receiving groove 302 on the side of the slide 301 close to the steel frame. Two vertically placed shaft rods 316 are fixed to the middle position of the side of the receiving groove 302 close to the slide 301. The outer wall of the shaft rod 316 is rotatably connected to the limit plate 17. The two limit plates 17 are connected to the side walls away from the slide 301 with the same curved spring 2 18. A baffle 19 is installed on the top of the receiving groove 302 to prevent the spring 2 18 from bending upward. It should be noted that the two limit plates 17 can deflect toward the inside of the receiving groove 302 around the corresponding shaft rod 3 16, and the end edge of the limit plate 17 away from the shaft rod 3 16 is provided with a notch, and the receiving groove 302 A clamping block corresponding to the position of the notch is provided at the end near the slide groove 301, so that in a normal state, the two limit plates 17 are arranged horizontally near the side walls of the slide groove 301, and the limit plates 17 are in sliding contact with the outer wall of the slider 11 near the side walls of the slide groove 301. Therefore, when the mechanical vibration of the MTS actuator 2 itself is transmitted from the mounting frame 7 position toward the reaction wall 3, the shear-type structure connecting frame 12 and spring 15 are used to disperse and buffer the forces in the directions of both ends, and the side limit plates 17 and spring 2 18 connecting the two limit plates 17 are used to offset and buffer the side forces, thereby reducing the influence of the mechanical vibration of the MTS actuator 2 itself on the test.

[0034] A method for testing the strength of a road bridge protective structure comprises the following steps:

[0035] Step 1: Build the steel frame and adjust it according to the size of the guardrail to be tested, and set the displacement sensor on the steel frame accordingly;

[0036] Step 2: Bond the front surfaces of multiple panels together using a special joint adhesive to form a guardrail panel 1, and install the guardrail panel 1 on the steel frame using corresponding multiple right-angle panels 5 and high-strength bolts 6;

[0037] Step 3: Install strain gauges on both sides of the plate below the high-strength bolts 6;

[0038] Step 4: Use the MTS actuator 2 to perform displacement-controlled loading at a constant rate, and the loading displacement continues to increase. Through the installation of multiple displacement sensors and strain gauges, the displacement of the beam-column node area and the load at the fixed position of the guardrail board 1 are observed. The structural deformation of the guardrail board 1 is observed with the naked eye.

[0039] Based on the above-mentioned test equipment and test method, and based on the steel frame assembly method and the installation method of the steel frame and the right-angle plate 5, the following different implementation methods can be adopted:

[0040] Example 1: Reference Figure 1-Figure 2, a road bridge protective structure strength testing equipment, the crossbeam 20 and the vertical column 21 are welded, and the right-angle plate 5 and the crossbeam 20 are welded. This installation method is simple and can ensure the firmness of the steel frame. However, the steel frame of this structure is generally only tested for large guardrail panels. After assembly, the steel frame is difficult to adjust according to actual conditions. After the test is completed, it needs to be dismantled and rebuilt, and its applicability is low.

[0041] Example 2: Reference Figure 5-10 The vertical column 21 is provided with a C-shaped steel structure with an opening toward the cross beam 20, and the vertical column 21 is provided with a slot 22 distributed at equal distances in the vertical direction toward the end of the cross beam 20. The opening width of the cross beam 20 is at least twice the distance between two adjacent slots 22, that is, when the upper and lower edges of the cross beam 20 are inserted into the two slots 22, there is at least one slot 22 in the middle area of ​​the opening of the cross beam 20, and two auxiliary plates 23 are fixed at the positions corresponding to the inner wall of the cross beam 20 and the vertical column 21. The two auxiliary plates 23 are respectively in sliding contact with the inner walls of the corresponding vertical column 21, that is, after the cross beam 20 is inserted, the two auxiliary plates 23 slide in along the inner wall of the corresponding vertical column 21, and the side walls of the auxiliary plates 23 are provided with a through hole, and the slot 22 is provided with a horizontal portion 221 that is in sliding contact with the edge of the cross beam 20, and a perforated portion 222 is provided at the position corresponding to the through hole of the horizontal portion 221. The beam 20 is correspondingly provided with an auxiliary steel bar 24, which passes through the perforated portion 222 and the through hole horizontally. Nuts 25 are installed at both ends of the auxiliary steel bar 24 on the outside of the vertical column 21. During the assembly of the steel frame, the position of the upper crossbeam 20 can be adjusted according to the different heights of the actual guardrail board 1, and the upper crossbeam 20 is correspondingly inserted into the card slots 22 of different heights. After the crossbeam 20 is fully inserted, the through hole of the auxiliary plate 23 on the crossbeam 20 corresponds to the position of the perforated portion 222, and then the auxiliary steel bar 24 is inserted through the auxiliary steel bar 24 and the nuts 25 at both ends are used to limit and fix the auxiliary steel bar 24; the auxiliary steel bar 24 and the auxiliary plate 23 can effectively ensure the firmness between the crossbeam 20 and the vertical column 21 under normal conditions, and the size of the installation area of ​​the steel frame can be quickly adjusted only by the nuts 25 at both ends, thereby ensuring the basic firmness of the steel frame on the basis of being able to achieve rapid adjustment to avoid affecting the test of the guardrail board 1.

[0042] In the present invention, an auxiliary support plate 26 is fixed on the inner wall of the vertical column 21 below the slot 22, and the auxiliary support plate 26 is located between the two auxiliary plates 23. When the cross beam 20 is inserted into the slot 22, the bottom outer wall of the cross beam 20 and the top inner wall of the cross beam 20 both slide in contact with the top of the auxiliary support plate 26 at the corresponding position, thereby improving the bearing capacity of the vertical column 21 on the cross beam 20; the vertical column 21 is located next to the nut 1 25, and the strain gauge 2 is used to monitor the load changes at the two ends of the auxiliary steel bar 24, and the accuracy of the test is improved by mutual verification of the monitoring values ​​of the strain gauge 2 and the displacement sensor 1.

[0043] In the present invention, a through slot 27 is provided at the 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 is fixed to the top of the right-angle plate 5, which is in sliding contact with the inner wall of the through slot 27. The outer wall of the extension rod 28 is located in the cross beam 20 and is connected to a nut 29 with an inner thread, so that the position of the right-angle plate 5 can be moved along the extension direction of the through slot 27, so as to adjust the extension distance of the right-angle plate 5 according to the thickness difference of the plate body at different upper and lower positions, so as to ensure the effectiveness of the vertical and positive installation of the guardrail plate 1, and avoid the installation deformation caused by the thickness difference of each position of the guardrail plate 1. Test accuracy; a pull ring 30 is fixed to the top of the extension rod 28, and a chain 33 is arranged between the pull ring 30 and the auxiliary steel bar 24, and a hook ring 31 is fixed to the end of the chain 33 facing the pull ring 30, and a hook ring 2 32 is fixed to the end of the chain 33 facing the auxiliary steel bar 24. Both the hook ring 1 31 and the hook ring 2 32 are openable ring structures, and the chain 33 is tightened by the buckling between the hook ring 1 31 and the pull ring 30, and the buckling of the hook ring 2 32 at different positions of the auxiliary steel bar 24, so as to ensure the stability and effectiveness of the extension rod 28 and the right-angle plate 5 for fixing and using at various positions of the through-groove 27, thereby ensuring the applicability and accuracy of the seismic resistance test of the guardrail plate 1.

[0044] The method of this embodiment can be used to quickly adjust small guardrails or large guardrails or other guardrails of different heights, and can be used in situations where the thickness differences at different positions of the guardrails affect the installation, thereby ensuring the applicability and adjustment convenience of the test equipment. For large guardrails, it can ensure the firmness of the steel frame while ensuring convenient adjustment to ensure the accuracy of the test.

[0045] Example 3: A road bridge protective structure strength testing device, in which the contact position between the crossbeam 20 and the vertical column 21 is disassembled and fixed by connecting plates and bolts. This is only suitable for testing small bridge guardrails and can be quickly disassembled for adjustment. When testing larger guardrail panels, a small number of bolts cannot ensure firm fixation, and a large number of bolts will result in excessive disassembly and inconvenience in replacement and adjustment.

[0046] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A road bridge protective structure strength testing device, comprising a steel frame and a reaction wall (3), wherein a guardrail plate (1) is mounted on the steel frame, wherein the guardrail plate (1) is formed by splicing a plurality of plates, and the steel frame is formed by two cross beams (20) and two vertical columns (21), wherein the device is characterized in that: 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, right-angle plates (5) are installed at positions corresponding to each plate on the crossbeam (20), high-strength bolts (6) are installed between the right-angle plates (5) and the plate, and restraining steel bars (8) are connected between the vertical columns (21); A displacement sensor 1 is connected between the horizontal beam (20) and the vertical column (21), a displacement sensor 2 is connected between the vertical column (21) and the ground beam (4), a displacement sensor 3 is connected between the ground beam (4) and the reaction wall (3), and strain gauges 1 are installed below the high-strength bolts (6) on both sides of the plate body; A mounting frame (7) is connected between the MTS actuator (2) and the reaction wall (3), and the mounting frame (7) is provided with a mounting plate (13) connected to the MTS actuator (2). The bottom of the mounting plate (13) is rotatably connected to two connecting frames (12). Two vertically upward extending limit frames (14) are fixed at the top of the reaction wall (3) at positions corresponding to the mounting plate (13). The mounting plate (13) slides vertically between the two limit frames (14). A slide groove (301) is provided at positions corresponding to the reaction wall (3) and the mounting frame (7). A screw rod (9) is rotatably connected between the two ends of the slide groove (301). One end of the screw rod (9) is transmission-connected to a rotating motor (10). The outer wall of the screw rod (9) is threadedly connected to two sliders (11). The screw rod (9) and the corresponding screw rods of the two sliders (11) are connected. The grooves are set in reverse, the outer wall of the slider (11) is slidably connected to the inner wall of the slide groove (301), the top of the slider (11) is rotatably connected to the bottom end of the connecting frame (12), and a spring one (15) is connected between the two sliders (11). The slide groove (301) is provided with a receiving groove (302) on the side close to the steel frame. Two vertically placed shaft rods three (16) are fixed in the middle position of the side of the receiving groove (302) close to the slide groove (301). The outer wall of the shaft rod three (16) is rotatably connected to the limit plate (17). The side walls of the two limit plates (17) away from the slide groove (301) are connected with the same curved spring two (18). A baffle (19) is installed on the top of the receiving groove (302). Under normal conditions, the two limit plates (17) are horizontally arranged near the side walls of the slide groove (301).

2. A road and bridge protective structure strength testing equipment according to claim 1, characterized in that: The crossbeam (20) adopts a C-shaped steel structure with an opening toward the vertical column (21), and the vertical column (21) adopts a C-shaped steel structure with an opening toward the crossbeam (20). The end of the vertical column (21) facing the crossbeam (20) is provided with slots (22) distributed at equal distances in the vertical direction, and the opening width of the crossbeam (20) is at least twice the distance between two adjacent slots (22).

3. A road and bridge protective structure strength testing equipment according to claim 2, characterized in that: Two auxiliary plates (23) are fixed at positions corresponding to the inner wall of the crossbeam (20) and the vertical column (21). The two auxiliary plates (23) are in sliding contact with the inner walls of both sides of the corresponding vertical column (21), and the side walls of the auxiliary plates (23) are provided with through holes.

4. A road and bridge protective structure strength testing equipment according to claim 3, characterized in that: The slot (22) is provided with a horizontal portion (221), and a perforated portion (222) is provided at a position corresponding to the through hole of the horizontal portion (221). The crossbeam (20) is provided with an auxiliary steel bar (24) corresponding to the horizontal portion (221). The auxiliary steel bar (24) passes through the perforated portion (222) and the through hole horizontally, and nuts (25) are installed at both ends of the auxiliary steel bar (24) on the outside of the vertical column (21).

5. A road and bridge protective structure strength testing equipment according to claim 4, characterized in that: An auxiliary support plate (26) is fixed to the inner wall of the vertical column (21) below the slot (22), and the auxiliary support plate (26) is located between the two auxiliary plates (23). The vertical column (21) is located next to the nut (25) and the strain gauge (2).

6. A road and bridge protective structure strength testing equipment according to claim 4, characterized in that: A through slot (27) is provided 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) is fixed to the top of the right-angle plate (5) and is in sliding contact with the inner wall of the through slot (27). The outer wall of the extension rod (28) is located inside the cross beam (20) and is connected to a nut (29) through a thread.

7. The road and bridge protective structure strength testing equipment according to claim 6, characterized in that: A pull ring (30) is fixed to the top end of the extension rod (28), a chain (33) is provided between the pull ring (30) and the auxiliary steel bar (24), a hook ring 1 (31) is fixed to one end of the chain (33) facing the pull ring (30), and a hook ring 2 (32) is fixed to one end of the chain (33) facing the auxiliary steel bar (24).

Images