Road construction bridge pressure bearing detection device

Abstract

The invention relates to the technical field of bridge deflection detectors, in particular to a road construction bridge pressure bearing detection device which comprises a supporting frame and a detector arranged in the supporting frame, a rotating shaft is arranged on the detector, the supporting frame is rotationally connected with the rotating shaft, a torsion spring is arranged on the rotating shaft between the supporting frame and the detector in a sleeving mode, and a hand wheel assembly is installed on the supporting frame. An electromagnetic clutch mechanism is arranged between the hand wheel assembly and the rotating shaft, the hand wheel assembly and the rotating shaft are linked through the electromagnetic clutch mechanism, an inclination detector and a reset switch are installed on the supporting frame, and the inclination detector and the reset switch are both electrically connected with the electromagnetic clutch mechanism. In the using process of the device, when the device is unstable and topples due to external interference such as sudden strong wind, mechanical collision or manual mistaken touch, the inclination detector triggers a signal to control the electromagnetic clutch mechanism to be disconnected, and the detector automatically turns over to enable the lens to move to the lower part, so that precise parts such as the lens are fundamentally prevented from being damaged when falling to the ground.

Description

Technical Field

[0001] This invention relates to the field of bridge deflection testing instruments, and more specifically to a road construction bridge bearing capacity testing device. Background Technology

[0002] As the core carrier of the transportation infrastructure system, road and bridge engineering comprises roadbed engineering, pavement engineering, bridge main structure, tunnel engineering, and ancillary facilities. In the process of new urbanization, this type of engineering undertakes the dual core functions of connecting transportation corridors and promoting regional economic linkage. Its engineering quality not only directly determines the efficiency of road network traffic and driving comfort, but also plays a strategic supporting role in realizing the integrated development pattern of "transportation-industry-space". It is a key infrastructure to ensure the stability of regional supply chains and the safety of people's travel.

[0003] After the completion of road and bridge projects, in order to ensure their operational safety and durability, it is necessary to conduct systematic and precise quality inspections on the completed bridge structure in accordance with relevant specifications. Bridge deflection testing, as a core control indicator for evaluating the overall stiffness and load-bearing capacity reserve of bridge structures, directly reflects the deformation characteristics of the structure under dead and live loads. It is a key basis for judging whether the structure has stiffness attenuation, stress redistribution, or potential damage. At present, the industry generally uses equipment such as laser deflection meters, total station deflection measurement systems, or dynamic deflection monitoring instruments to conduct on-site measurements and obtain the deflection values ​​of the structure under different working conditions.

[0004] However, current mainstream traditional bridge deflection testing equipment generally suffers from insufficient protection capabilities. In the field or under complex weather conditions, it is easily unstable and tipped over due to external interference such as sudden strong winds, mechanical collisions, or accidental human contact, which can damage the precision components on the device. Summary of the Invention

[0005] In view of the above situation and to overcome the defects of the prior art, the present invention provides a road construction bridge bearing capacity testing device to solve the above problems.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A road construction bridge bearing capacity testing device includes a support frame and a detector installed inside the support frame. The detector is equipped with a rotating shaft, and the support frame is rotatably connected to the rotating shaft. A torsion spring is sleeved on the rotating shaft between the support frame and the detector. A handwheel assembly is installed on the support frame, and an electromagnetic clutch mechanism is provided between the handwheel assembly and the rotating shaft. The handwheel assembly and the rotating shaft are linked through the electromagnetic clutch mechanism. A tilt detector and a reset switch are installed on the support frame, and both the tilt detector and the reset switch are electrically connected to the electromagnetic clutch mechanism. A retractable base is installed at the bottom of the support frame.

[0008] Preferably, the electromagnetic clutch mechanism includes a first receiving body, a second receiving body, and a locking rod. The first receiving body is coaxially fixedly disposed at the end of the rotating shaft, the second receiving body is coaxially disposed on the output part of the handwheel assembly, and the two ends of the locking rod are slidably connected to the first receiving body and the second receiving body, respectively. A fixing plate is provided on the locking rod, and a first spring is installed between the support frame and the fixing plate.

[0009] Preferably, an electromagnet is installed on the support frame, the tilt detector is electrically connected to the electromagnet, and a magnet is installed on the fixing plate. When the electromagnet is energized, it magnetically repels the magnet.

[0010] Preferably, the bottom of the support frame is provided with a rotation adjustment platform, and an elastic buffer block matching the detector is installed on the support frame.

[0011] Preferably, the reset switch includes a control cap that is slidably disposed at the bottom of the rotary adjustment platform, a second spring is installed between the bottom of the rotary adjustment platform and the top of the control cap, a distance sensor is installed at the bottom of the rotary adjustment platform, the detection part of the distance sensor is disposed facing the top of the control cap, and the distance sensor is electrically connected to an electromagnet.

[0012] Preferably, the retractable base includes a lifting rod and a sleeve rod, the lifting rod is fixed to the bottom of the rotating adjustment platform, and the outer surface of the lifting rod slides in contact with the inner wall of the sleeve rod.

[0013] Preferably, the sleeve rod has a plurality of slots arranged vertically along its upper edge, and the lifting rod has elastic buckles that match the slots.

[0014] Preferably, the outer surface of the sleeve has at least three leg groups arranged in a circumferential array. The leg group includes a long leg and a short leg. The top of the long leg and the top of the short leg are both hinged to the sleeve. One of the long legs is positioned to correspond to the elastic buckle, and the top of the long leg is higher than the top of the short leg.

[0015] Preferably, the long support leg has a mounting groove, and the mounting groove has a partition, which divides the space inside the mounting groove into an upper sliding groove and a lower sliding groove; a movable rod is slidably connected through the partition along the direction of the long support leg, the top end of the movable rod extends into the interior of the upper sliding groove, and the end is fixedly connected to a joint, which is hinged to the bottom end of the short support leg; the bottom end of the movable rod extends into the interior of the lower sliding groove, and a universal wheel is installed at the end; a third spring is sleeved on the movable rod between the joint and the partition.

[0016] Preferably, a locking ring is threaded onto the sleeve rod, and a tapered groove is provided at the bottom of the locking ring, with the top of the long support leg extending into the interior of the tapered groove.

[0017] The beneficial effects of this invention are as follows:

[0018] 1. During the use of this invention, when the device becomes unstable and tilts due to external interference such as sudden strong winds, mechanical collisions, or accidental human contact, the tilt detector will trigger a signal to control the electromagnetic clutch mechanism to disengage, and the detector will automatically flip to move the lens downwards, fundamentally preventing damage to precision components such as the lens when it falls to the ground.

[0019] 2. When using this invention, the long outriggers can be quickly extended and retracted by rotating the locking ring in both directions, achieving a rapid and reliable switch between the states of the long outriggers and making operation convenient. When the device is moved as needed, rotating the locking ring in the forward direction causes multiple long outriggers to retract inwards simultaneously, and the casters automatically extend from the sliding groove. This maintains the stability of the device while giving it flexible mobility.

[0020] 3. When the present invention needs to be shut down, pressing the control cap will cause the detector to rotate and reset, realizing the function of quick reset when the device is turned off; after the device is used, rotating the locking ring in the forward direction will completely retract the long and short legs. The side wall of the long leg will press the elastic buckle, thereby releasing the lock on the lifting rod. The detector and the lifting rod will automatically descend, greatly reducing the vertical space occupied by the device. At the same time, the detector will automatically flip to the lens facing down for reset, completing the quick storage of the present invention, which is convenient for storage. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 .

[0022] Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 .

[0023] Figure 3 This is a cross-sectional view of the sleeve structure of the present invention.

[0024] Figure 4 This is a cross-sectional view of the support frame of the present invention. Figure 1 .

[0025] Figure 5 This is a cross-sectional view of the support frame of the present invention. Figure 2 .

[0026] Figure 6 For the present invention Figure 3 A magnified structural diagram of part A in the middle.

[0027] Figure 7 For the present invention Figure 5 A magnified structural diagram of section B in the middle.

[0028] In the attached diagram: 1. Support frame; 2. Detector; 3. Rotating shaft; 4. Torsion spring; 5. Handwheel assembly; 6. First receiving body; 7. Second receiving body; 8. Fitting rod; 9. Fixing plate; 10. First spring; 11. Tilt detector; 12. Electromagnet; 13. Magnet; 14. Rotation adjustment platform; 15. Control cap; 16. Second spring; 17. Distance sensor; 18. Lifting rod; 19. Sleeve rod; 20. Elastic buffer block; 21. Slot; 22. Elastic buckle; 23. Long support leg; 24. Short support leg; 25. Upper sliding groove; 26. Lower sliding groove; 27. Movable rod; 28. Joint component; 29. ​​Universal wheel; 30. Partition; 31. Third spring; 32. Locking ring; 33. Conical groove; 34. Controller. Detailed Implementation

[0029] The following will be for reference. Figures 1 to 7 The various embodiments of the present invention will be described in detail below. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0030] A road construction bridge bearing capacity testing device, such as Figure 1 As shown, the device includes a support frame 1 and a detector 2 installed inside the support frame 1. The detector 2 adopts an external rubber protective layer design, which mainly provides excellent buffering and shock absorption performance and can effectively absorb external impact and collision energy. A rotating shaft 3 is provided on the detector 2, and the support frame 1 is rotatably connected to the rotating shaft 3. A torsion spring 4 is sleeved on the rotating shaft 3 between the support frame 1 and the detector 2. When the detector 2 is in use, the torsion spring 4 is in a charged state. A handwheel assembly 5 is installed on the support frame 1. An electromagnetic clutch mechanism is provided between the handwheel assembly 5 and the rotating shaft 3. The handwheel assembly 5 and the rotating shaft 3 are linked through the electromagnetic clutch mechanism. The handwheel assembly 5 integrates a handwheel, a reduction gear set and a braking element. The handwheel assembly 5 is used to drive the detector 2 to complete the up and down flipping movement, thereby realizing the precise adjustment of its lens angle. This drive mechanism is existing technology, so it will not be described in detail.

[0031] The support frame 1 is equipped with a tilt detector 11 and a reset switch. Both the tilt detector 11 and the reset switch are electrically connected to the electromagnetic clutch mechanism. The bottom of the support frame 1 is equipped with a retractable base. The bottom of the support frame 1 is equipped with a rotary adjustment platform 14. The detector 2 is driven to rotate horizontally by the rotary adjustment platform 14. Combined with its own up-and-down flip (pitch) function, this device realizes flexible multi-degree-of-freedom adjustment, so as to quickly adapt to the detection needs of different field positions. The support frame 1 is equipped with an elastic buffer block 20 that matches the detector 2.

[0032] When the device tilts due to external interference such as sudden strong winds, mechanical collisions, or accidental human intervention, the tilt detector 11 will trigger a signal to disengage the electromagnetic clutch mechanism, releasing the handwheel assembly 5 from the shaft 3. Figure 1 For reference, the torsion spring 4 releases force and causes the detector 2 to rotate rapidly clockwise around the pivot 3, moving the lens of the detector 2 downward and resetting its posture before tipping over, thus fundamentally preventing damage to precision components such as the lens when it falls over. It should be noted that at the end of the reset action, the specially designed elastic buffer block 20 absorbs the remaining kinetic energy of the detector 2 through its high damping characteristics, serving both as a quick stop and a buffer protection function, effectively suppressing the end impact and ensuring the smoothness of the reset process and the safety of the components.

[0033] like Figure 5 and Figure 7 As shown, the electromagnetic clutch mechanism includes a first receiving body 6, a second receiving body 7, and a locking rod 8. The first receiving body 6 is coaxially fixed at the end of the rotating shaft 3, and the second receiving body 7 is coaxially mounted on the output part of the handwheel assembly 5. The two ends of the locking rod 8 are slidably connected to the first receiving body 6 and the second receiving body 7, respectively. A fixing plate 9 is provided on the locking rod 8, and a first spring 10 is installed between the support frame 1 and the fixing plate 9. The two ends of the locking rod 8 can slide within the first receiving body 6 and the second receiving body 7 to... Figure 7 As a reference, when the engaging rod 8 slides to the right until it disengages from the first receiving body 6, the handwheel assembly 5 disengages from the rotating shaft 3.

[0034] like Figure 7 As shown, an electromagnet 12 is installed on the support frame 1, the tilt detector 11 is electrically connected to the electromagnet 12, and a magnet 13 is installed on the fixing plate 9. When the electromagnet 12 is energized, it magnetically repels the magnet 13. Under the action of the magnetic repulsion force, the fixing plate 9 drives the fitting rod 8 to slide to the right, and the left end of the fitting rod 8 disengages from the first support body 6.

[0035] like Figures 4-7 As shown, the reset switch includes a control cap 15 slidably disposed at the bottom of the rotary adjustment platform 14. A second spring 16 is installed between the bottom of the rotary adjustment platform 14 and the top of the control cap 15. A distance sensor 17 is installed at the bottom of the rotary adjustment platform 14. The detection part of the distance sensor 17 is positioned facing the top of the control cap 15. The distance sensor 17 is electrically connected to the electromagnet 12. It should be noted that this device integrates a control unit with the controller 34 as its core. When the control cap 15 is pressed, the distance sensor 17 detects a decrease in distance and immediately converts this signal into an electrical signal and transmits it to the controller 34. The controller 34 responds according to a preset program and controls the electromagnet 12 to be energized. After being energized, the electromagnet 12 and the magnet 13 generate a magnetic repulsive force, ultimately achieving rapid disengagement between the handwheel assembly 5 and the rotating shaft 3.

[0036] like Figure 2 and Figure 6 As shown, the retractable base includes a lifting rod 18 and a sleeve rod 19. The lifting rod 18 is fixed to the bottom of the rotating adjustment platform 14, and the outer surface of the lifting rod 18 slides against the inner wall of the sleeve rod 19. The sleeve rod 19 can slide, allowing it to be raised and lowered as needed, thus enabling free adjustment of the height of the detector 2. Several slots 21 are arranged vertically along the upper edge of the sleeve rod 19. The lifting rod 18 is provided with elastic buckles 22 that match the slots 21. The elastic buckles 22 are made of a material with a certain degree of elasticity, such as high-strength plastic or metal spring sheets, and have a certain bending deformation capability. Through the cooperation of the elastic buckles 22 and the multiple slots 21, the position of the lifting rod 18 can be locked after the height adjustment.

[0037] like Figure 3 and Figure 6 As shown, the outer surface of the sleeve 19 has at least three leg groups arranged in a circumferential array. The leg groups include long legs 23 and short legs 24. The top ends of the long legs 23 and the short legs 24 are hinged to the sleeve 19. One of the long legs 23 is positioned to correspond to the elastic buckle 22. When the long legs 23 are fully retracted, they can compress the elastic buckle 22. The top end of the long legs 23 is higher than the top end of the short legs 24.

[0038] A mounting groove is provided on the long support leg 23, and a partition 30 is provided inside the mounting groove. The partition 30 divides the space inside the mounting groove into an upper sliding groove 25 and a lower sliding groove 26. A movable rod 27 is slidably connected through the partition 30 along the direction of the long support leg 23. The top end of the movable rod 27 extends into the interior of the upper sliding groove 25, and a joint 28 is fixedly connected to the end. The joint 28 is hinged to the bottom end of the short support leg 24. The bottom end of the movable rod 27 extends into the interior of the lower sliding groove 26, and a caster wheel 29 is installed at the end. A third spring 31 is sleeved on the movable rod 27 between the joint 28 and the partition 30. Figure 3 As the long support leg 23 flips downward to retract, the short support leg 24 flips downward to retract, and drives the joint 28 to move downward along the direction of the movable rod 27. The movable rod 27 moves synchronously and causes the caster wheel 29 to extend out of the sliding groove 26.

[0039] like Figure 3 As shown, a locking ring 32 is threaded onto the sleeve rod 19. A tapered groove 33 is provided at the bottom of the locking ring 32, and the top of the long support leg 23 extends into the interior of the tapered groove 33.

[0040] When the locking ring 32 is driven to rotate in the forward direction, it moves downward along the sleeve rod 19. The tapered groove 33 at the lower part of the locking ring 32 then presses down against the top of the long support leg 23, pressing it inward and flipping it over to complete the retraction action. The locking ring 32 can provide mechanical limit for the retracted long support leg 23, so that it is stably locked.

[0041] When the locking ring 32 rotates in the reverse direction, the helical pair drives it to move upward along the sleeve rod 19. At this time, the previously compressed third spring 31 releases energy, and its restoring force pushes the joint 28 to move upward along the movable rod 27, thereby driving the short support leg 24 to flip upward and open the long support leg 23 to the working position. This device adjusts the extension and retraction of the long support leg 23 by rotating the locking ring 32 in both directions, realizing a fast and reliable switch of the state of the long support leg 23. It is easy to operate and has a stable structure.

[0042] During use, if the device becomes unstable and tipes over due to external interference such as sudden strong winds, mechanical collisions, or accidental human intervention, the tilt detector 11 will monitor the abnormal posture in real time and send a signal to the controller 34. The controller 34 will then energize the electromagnet 12, causing it to repel the magnet 13. This repulsive force pushes the fixing plate 9, causing the locking rod 8 to slide to the right. When the locking rod 8 slides to the right until it disengages from the first support body 6, the linkage constraint between the handwheel assembly 5 and the rotating shaft 3 will be released. Figure 1 For reference, the torsion spring 4 releases force and causes the detector 2 to rotate rapidly clockwise around the pivot 3. The lens of the detector 2 moves downward to reset, realizing the posture reset before tipping over, fundamentally avoiding damage to precision components such as the lens when it falls over.

[0043] When detector 2 needs to be turned off, manually press control cap 15. After distance sensor 17 detects that the distance has decreased, it sends a signal to controller 34. Controller 34 controls electromagnet 12 to be energized and magnetically repels magnet 13. Torsion spring 4 releases force and causes detector 2 to rotate rapidly clockwise around pivot 3. The lens of detector 2 automatically moves to the bottom to reset.

[0044] When the device is moved as needed, the locking ring 32 is rotated forward, and the locking ring 32 moves downward along the sleeve rod 19. Its conical groove 33 presses down on the top of the long support leg 23, forcing the long support leg 23 to retract inward. At the same time, the short support leg 24 flips downward, pushing the joint 28 to move downward along the movable rod 27, so that the caster wheel 29 extends out from the sliding groove 26. This action maintains the stability of the device while giving it flexible mobility.

[0045] After the device is used, rotate the locking ring 32 forward. The locking ring 32 moves downward along the sleeve rod 19, causing the long support leg 23 and the short support leg 24 to retract completely. At this time, the side wall of the long support leg 23 presses the elastic buckle 22, causing it to deform elastically and disengage from the slot 21, thereby releasing the lock on the lifting rod 18. Under the action of gravity, the detector 2 and the lifting rod 18 automatically descend, greatly reducing the vertical space occupied by the device and facilitating the storage of the device.

[0046] It should be noted that during the retraction and descent of the lifting rod 18, the top of the sleeve rod 19 touches the control cap 15, triggering the distance sensor 17. The controller 34 then activates the electromagnet 12 according to the preset program, releasing the mechanical constraint through magnetic repulsion, causing the torsion spring 4 to drive the detector 2 to automatically flip to a safe position with the lens facing downwards, thus completing the final reset.

[0047] It should be noted that in the description of this invention, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0048] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0049] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A road construction bridge bearing capacity testing device, comprising a support frame (1) and a detector (2) disposed within the support frame (1), characterized in that, The detector (2) is provided with a rotating shaft (3), the support frame (1) is rotatably connected to the rotating shaft (3), the rotating shaft (3) between the support frame (1) and the detector (2) is fitted with a torsion spring (4), the support frame (1) is equipped with a handwheel assembly (5), the handwheel assembly (5) and the rotating shaft (3) are provided with an electromagnetic clutch mechanism, the handwheel assembly (5) and the rotating shaft (3) are linked by the electromagnetic clutch mechanism, the support frame (1) is equipped with a tilt detector (11) and a reset switch, the tilt detector (11) and the reset switch are electrically connected to the electromagnetic clutch mechanism, and the bottom of the support frame (1) is equipped with a retractable base.

2. The road construction bridge bearing capacity testing device according to claim 1, characterized in that, The electromagnetic clutch mechanism includes a first receiving body (6), a second receiving body (7), and a locking rod (8). The first receiving body (6) is coaxially fixed at the end of the rotating shaft (3), and the second receiving body (7) is coaxially mounted on the output part of the handwheel assembly (5). The two ends of the locking rod (8) are slidably connected to the first receiving body (6) and the second receiving body (7), respectively. A fixing plate (9) is provided on the locking rod (8), and a first spring (10) is installed between the support frame (1) and the fixing plate (9).

3. The road construction bridge bearing capacity testing device according to claim 2, characterized in that, An electromagnet (12) is installed on the support frame (1). The tilt detector (11) is electrically connected to the electromagnet (12). A magnet (13) is installed on the fixing plate (9). When the electromagnet (12) is energized, it magnetically repels the magnet (13).

4. The road construction bridge bearing capacity testing device according to claim 3, characterized in that, The bottom of the support frame (1) is provided with a rotating adjustment platform (14), and an elastic buffer block (20) matching the detector (2) is installed on the support frame (1).

5. A road construction bridge bearing capacity testing device according to claim 4, characterized in that, The reset switch includes a control cap (15) that is slidably disposed at the bottom of the rotary adjustment platform (14). A second spring (16) is installed between the bottom of the rotary adjustment platform (14) and the top of the control cap (15). A distance sensor (17) is installed at the bottom of the rotary adjustment platform (14). The detection part of the distance sensor (17) is disposed facing the top of the control cap (15). The distance sensor (17) is electrically connected to the electromagnet (12).

6. The road construction bridge bearing capacity testing device according to claim 5, characterized in that, The retractable base includes a lifting rod (18) and a sleeve rod (19). The lifting rod (18) is fixed to the bottom of the rotating adjustment platform (14), and the outer surface of the lifting rod (18) slides in contact with the inner wall of the sleeve rod (19).

7. A road construction bridge bearing capacity testing device according to claim 6, characterized in that, The sleeve rod (19) has several slots (21) arranged vertically along its upper edge, and the lifting rod (18) has elastic buckles (22) that match the slots (21).

8. A road construction bridge bearing capacity testing device according to claim 7, characterized in that, The outer surface of the sleeve (19) has at least three leg groups arranged in a circumferential array. The leg groups include long legs (23) and short legs (24). The top ends of the long legs (23) and the short legs (24) are hinged to the sleeve (19). One of the long legs (23) is positioned to correspond to the elastic buckle (22), and the top end of the long legs (23) is higher than the top end of the short legs (24).

9. A road construction bridge bearing capacity testing device according to claim 8, characterized in that, The long support leg (23) is provided with an installation groove, and a partition (30) is provided in the installation groove. The partition (30) divides the space inside the installation groove into an upper sliding groove (25) and a lower sliding groove (26). A movable rod (27) is slidably connected through the partition (30) along the direction of the long support leg (23). The top end of the movable rod (27) extends into the interior of the upper sliding groove (25), and a joint (28) is fixedly connected to the end. The joint (28) is hinged to the bottom end of the short support leg (24). The bottom end of the movable rod (27) extends into the interior of the lower sliding groove (26), and a universal wheel (29) is installed at the end. A third spring (31) is sleeved on the movable rod (27) between the joint (28) and the partition (30).

10. A road construction bridge bearing capacity testing device according to claim 9, characterized in that, The sleeve rod (19) is threaded with a locking ring (32), and the bottom of the locking ring (32) is provided with a tapered groove (33), and the top of the long support leg (23) extends into the interior of the tapered groove (33).

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