Multi-variable point static loading device for bridge test
By designing a multi-variable point static loading device for bridge tests, the main moving mechanism and auxiliary support mechanism can achieve smooth movement of the loading beam and the loading head, the problems of difficulty and disturbance of the multiple-variable loading point static loading in the prior art are solved, and the accuracy and convenience of the test results are improved.
Patent Information
- Application Number
- CN202421781998.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-26
- Publication Date
- 2025-04-22
- Estimated Expiration
- 2034-07-26
AI Technical Summary
In the prior art, it is difficult to achieve static loads at multiple moving loading points in bridge tests, and disturbances are easily generated during the movement, resulting in low accuracy of the test results.
A multi-point static loading device is designed, including a mounting base, a main moving mechanism, a loading beam, an auxiliary support mechanism and a loading head. Through the synergy between the main moving mechanism and the auxiliary support mechanism, the smooth and fast movement of the loading beam and the loading head is achieved, and the multi-point movement work on the test beam is completed.
The device can easily complete the movement of multiple points on the test beam, reducing disturbance, improving the accuracy of the test results, and reducing the total cost of the test.
Smart Images
Figure CN222784292U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of bridge engineering, and more specifically relates to a multiple variable point static loading device for bridge testing. Background Art
[0002] In the field of modern engineering, especially in the field of bridge engineering, when exploring and verifying relevant laws and methods, it is extremely important to use specimens to test certain problems in the laboratory (the specimen can be a simple beam segment of a certain form, or a model bridge that is proportionally reduced based on the actual bridge, and the specimen length is usually 4-7 meters). The loading method in the test can be divided into static loading (V=0) and moving loading (V≠0) according to the speed at which the load moves on the bridge. The indicator that the test focuses on and wants to obtain is usually the response of the bridge under static loading or the static component of the response under moving load. In order to obtain such an indicator, the loading method of the test in the laboratory often uses multiple moving loading points for static loading, and each loading point moves compared to the previous loading point.
[0003] The load mass applied to the test beam in the test is often proportionally reduced according to the full load mass of common vehicles in actual operation, but even so, the load mass can reach several tons or even dozens of tons, and the load value is still large. Such a large tonnage load is difficult to simulate with counterweights or heavy objects, and it is also impossible to load with actual vehicles due to size issues. Therefore, static loading of large tonnage loads in the laboratory needs to be completed with the help of a loading test machine. However, there are currently problems in loading static loads with multiple mobile loading points in the laboratory: 1. It is difficult to achieve movement between multiple points: due to its own structural characteristics, the loading test machine can only perform static loading at a single point or at multiple points at a single time with the cooperation of auxiliary beams, and the loading test machine has a large reaction frame and needs to be fixed to the ground. Therefore, it is impossible to perform large-tonnage static loading of multiple mobile loading points by directly moving the loading device. 2. While achieving movement, the disturbance increases, the accuracy decreases, the safety risk increases, the convenience is not high, and the manpower, material resources and time costs consumed are large. Utility Model Content
[0004] The utility model aims to provide a multiple variable-point static loading device for bridge testing, so as to solve the technical problems in the prior art that it is difficult to load static loads on the test beam multiple times, and disturbances are easily generated during the movement, resulting in low accuracy of the test results.
[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide a multiple variable point static loading device for bridge testing, comprising:
[0006] A mounting base, used for fixed installation on the ground; a supporting structure is provided on the mounting base;
[0007] A main moving mechanism is installed on the supporting structure; a first lifter is provided at the upper end of the main moving mechanism;
[0008] A loading beam is arranged horizontally, one end of which is mounted on the supporting structure and located above the first lifter, and the other end of which is suspended outside the supporting structure; the first lifter is used to drive the loading beam to move up and down;
[0009] an auxiliary support mechanism, mounted on the other end of the loading beam; the auxiliary support mechanism comprises a second lifter and an auxiliary wheel mounted on the second lifter, and the auxiliary wheel is located at the lower end of the loading beam, and the second lifter is used to drive the auxiliary wheel to move up and down;
[0010] The loading head is fixedly mounted on the other end of the loading beam and is located on one side of the auxiliary wheel; the test beam is used to be installed below the loading beam and is arranged along the length direction of the loading beam; the loading head is used to apply a force on the test beam from top to bottom.
[0011] In a possible implementation, a through opening is provided on the support structure, the main moving mechanism is installed on the bottom surface of the through opening, the length direction of the through opening is consistent with the length direction of the loading beam, and the loading beam is installed in the through opening.
[0012] In a possible implementation, there are two mounting seats arranged at intervals; the supporting structure includes two supporting columns and a supporting block fixedly installed between the two supporting columns; and the through-hole is opened on the supporting block.
[0013] In a possible implementation, the main moving mechanism includes:
[0014] Two guide rails are arranged in parallel and spaced apart in the through opening;
[0015] There are multiple running wheels, which are respectively installed on the two guide rails; the running wheels are used to move along the guide rails; there are multiple first lifters, which are respectively installed on the multiple running wheels;
[0016] A supporting pad is arranged in the through opening, and the two guide rails and the plurality of travel wheels are respectively mounted on both sides of the supporting pad; one end of the loading beam is mounted on the supporting pad.
[0017] In a possible implementation, the mounting seat includes two anti-overturning frames respectively mounted at the front and rear ends of the supporting structure, and the length direction of the anti-overturning frames is consistent with the length direction of the loading beam.
[0018] In one possible implementation, a first moving wheel is provided at the lower end of the supporting structure, and a second moving wheel is provided at the lower end of the anti-overturning frame; and a first supporting leg for supporting on the ground is provided on the supporting structure, and a second supporting leg for supporting on the ground is provided on the anti-overturning frame.
[0019] In a possible implementation, rubber pads are provided at the lower ends of the first supporting leg and the second supporting leg.
[0020] In a possible implementation manner, the loading head is located on a side of the auxiliary supporting mechanism away from the main moving mechanism.
[0021] In a possible implementation, a rubber pad is provided at the lower end of the loading head.
[0022] In a possible implementation, a pressure sensor is provided in the loading head, and the first lifter and the second lifter are both jacks.
[0023] The beneficial effects of the multiple variable-point static loading device for bridge testing provided by the utility model are as follows: compared with the prior art, the multiple variable-point static loading device for bridge testing of the utility model, when used; the test beam is set below the loading beam and the loading head, and there is a loading spacing between the test beam and the lower end surface of the loading head, and the auxiliary support mechanism and the main moving mechanism are checked to be in zero position; the first lifter and the second lifter are started to control the movement of the loading head and the auxiliary wheel, and the lower end of the auxiliary wheel is slightly lower than the lower end of the loading head, and the lower end of the auxiliary wheel is supported on the test beam, and the main moving mechanism is started to control the movement of the loading beam so that the loading head is located directly above the loading point; the first lifter and the second lifter are started again to make the lower end of the loading head contact with the test beam, and the auxiliary wheel is separated from the test beam and located above the test beam; finally, the actuator is used to act on the loading beam, and the load of the loading head is monitored until the static test of the loading point of the test beam is completed. When the next loading point needs to be tested, the first and second lifters are started to separate the loading head from the test beam and place it above the test beam, while the auxiliary wheels move downward and are supported on the test beam, and the main moving mechanism is started to drive the loading beam to move along its length direction, so that the loading head is located directly above the next loading point, thereby smoothly completing the static test of the next loading point. In this way, the loading beam and the loading head are moved smoothly and quickly with the help of the main moving mechanism and the auxiliary support mechanism, thereby conveniently completing the multi-point movement work on the test beam, and no large disturbance will be generated during the movement, thereby improving the accuracy of the test results. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.
[0025] Figure 1 A schematic diagram of the structure of a multiple variable-point static loading device for bridge testing provided by an embodiment of the utility model;
[0026] Figure 2 A schematic diagram of the structure of the main moving mechanism provided by an embodiment of the utility model;
[0027] Figure 3 A schematic diagram of force analysis of a multiple variable-point static loading device for bridge testing provided in an embodiment of the utility model.
[0028] Among them, the reference numerals in the figure are:
[0029] 1. Mounting seat; 11. Anti-overturning frame; 12. Second moving wheel; 13. Second supporting leg; 2. Supporting structure; 21. Through-hole; 22. Supporting column; 23. Supporting block; 24. First moving wheel; 25. First supporting leg; 26. Supporting pad; 3. Main moving mechanism; 31. First lifter; 32. Guide rail; 33. Traveling wheel; 4. Loading beam; 5. Auxiliary supporting mechanism; 51. Second lifter; 52. Auxiliary wheel; 6. Loading head; 61. Rubber pad; 7. Test beam; 8. Actuator. DETAILED DESCRIPTION
[0030] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.
[0031] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.
[0032] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0034] See also Figure 1 and Figure 2 Now, the multiple variable-point static loading device for bridge testing provided by the utility model is described. A multiple variable-point static loading device for bridge testing includes a mounting seat 1, a main moving mechanism 3, a loading beam 4, an auxiliary support mechanism 5 and a loading head 6; the mounting seat 1 is used for fixed installation on the ground; a supporting structure 2 is provided on the mounting seat 1; the main moving mechanism 3 is installed on the supporting structure 2; a first lifter 31 is provided on the upper end of the main moving mechanism 3; the loading beam 4 is arranged horizontally, one end of which is installed on the supporting structure 2 and is located above the first lifter 31, and the other end is suspended outside the supporting structure 2; the first lifter 31 is used to drive the loading beam 4 upward. The auxiliary support mechanism 5 is installed on the other end of the loading beam 4; the auxiliary support mechanism 5 includes a second lifter 51 and an auxiliary wheel 52 installed on the second lifter 51, and the auxiliary wheel 52 is located at the lower end of the loading beam 4, and the second lifter 51 is used to drive the auxiliary wheel 52 to move up and down; the loading head 6 is fixedly installed at the other end of the loading beam 4 and is located on one side of the auxiliary wheel 52; the test beam 7 is used to be installed below the loading beam 4 and is arranged along the length direction of the loading beam 4; the loading head 6 is used to apply a force on the test beam 7 from top to bottom.
[0035] Compared with the prior art, the multiple variable-point static loading device for bridge testing provided by the utility model has the following advantages when used: the test beam 7 is arranged below the loading beam 4 and the loading head 6, and there is a loading spacing between the test beam 7 and the lower end surface of the loading head 6, the auxiliary support mechanism 5 and the main moving mechanism 3 are checked to be in the zero position; the first lifter 31 and the second lifter 51 are started to control the loading head 6 and the auxiliary wheel 52 to move, and the lower end of the auxiliary wheel 52 is slightly lower than the lower end of the loading head 6, the loading beam 4 is higher than the supporting structure 2, and the lower end of the auxiliary wheel 52 is supported on the test beam 7, and the main moving mechanism 3 is started to control the movement of the loading beam 4 so that the loading head 6 is located directly above the loading point; the first lifter 31 and the second lifter 51 are started again to make the lower end of the loading head 6 contact with the test beam 7 and one end of the loading beam 4 is supported on the supporting structure 2, while the auxiliary wheel 52 is separated from the test beam 7 and located above the test beam 7; finally, the actuator 8 is used to act on the loading beam 4, and the load of the loading head 6 is monitored until the static test of the loading point of the test beam 7 is completed. When the next loading point needs to be tested, the first lifter 31 and the second lifter 51 are started to separate the loading head 6 from the test beam 7 and place it above the test beam 7, and the auxiliary wheel 52 moves downward and is supported on the test beam 7, and the main moving mechanism 3 is started to drive the loading beam 4 to move along its length direction, so that the loading head 6 is located directly above the next loading point, so that the static test of the next loading point can be successfully completed. In this way, the loading beam 4 and the loading head 6 are moved smoothly and quickly with the help of the main moving mechanism 3 and the auxiliary support mechanism 5, so as to conveniently complete the multi-point movement work on the test beam 7, and no large disturbance will be generated during the movement, thereby improving the accuracy of the test results.
[0036] like Figure 3 As shown, where: is the span of the test beam 7; is the length of the loading beam 4, and ; is the load applied by the actuator 8; is the force on the supporting structure 2, and ; is the force applied to the test beam 7, and .
[0037] When the actuator 8 is loaded, the multiple variable-point static loading device for bridge testing applies load to the test beam 7 through the loading beam 4. The load on the test beam 7 is monitored by the built-in pressure sensor of the loading head 6, and no additional calculation is required. After loading at a certain loading point, the process of moving to the next loading point can be changed by moving the loading beam 4. , The point position conversion can also be achieved by directly moving the mounting base 1 and the supporting structure 2 to change the position of the overall structure.
[0038] The multiple variable-point static loading device for bridge testing provided by the utility model reduces safety risks and improves flexibility while achieving the target function. With the assistance of the multiple variable-point static loading device for bridge testing, when the test has a large tonnage loading demand of multiple loading point movements, it is only necessary to manipulate the loading beam 4 or the overall movement of the multiple variable-point static loading device for bridge testing, without moving the test beam 7 and other test facilities, thereby avoiding unnecessary disturbances caused by the operation during the test and improving the test accuracy. At the same time, the multiple repeated movement process is reduced, and the total cost of the test (time cost and labor cost) is reduced. And due to the mobility of the multiple variable-point static loading device for bridge testing, the multiple variable-point static loading device for bridge testing can be used to load any position on the test beam 7 without moving the test beam 7, thereby improving the convenience of the test.
[0039] See also Figure 1 As a specific embodiment of the multiple variable-point static loading device for bridge testing provided by the utility model, a through hole 21 is provided on the supporting structure 2, and the main moving mechanism 3 is installed on the bottom surface of the through hole 21. The length direction of the through hole 21 is consistent with the length direction of the loading beam 4, and the loading beam 4 is installed in the through hole 21; the longitudinal cross-section of the through hole 21 is set to be rectangular, and the main moving mechanism 3 is installed on the bottom surface of the through hole 21, the loading beam 4 is penetrated in the through hole 21, and the lower end face is supported on the main moving mechanism 3, so that the loading beam 4 moves in the through hole 21 of the supporting structure 2 and along the length direction of the through hole 21. With the help of the through hole 21, the loading beam 4 can be limited so that the movement of the loading beam 4 is more accurate and stable.
[0040] See also Figure 1 As a specific embodiment of the multiple variable point static loading device for bridge test provided by the utility model, there are two mounting seats 1, which are arranged at intervals; the supporting structure 2 includes two supporting columns 22 and a supporting block 23 fixedly installed between the two supporting columns 22; a through hole 21 is opened on the supporting block 23; two mounting seats 1 are provided to make the installation of the entire multiple variable point static loading device for bridge test more stable and firm. The supporting structure 2 includes two supporting columns 22 and a supporting block 23, and the two supporting columns 22 and the supporting block 23 form an inverted U-shaped structure, and the two supporting columns 22 are fixed on the two mounting seats 1 respectively; at the same time, a through hole 21 is opened on the supporting block 23, in this way, the weight of the loading beam 4 acts on the supporting block 23, the two supporting columns 22 and the two mounting seats 1, so that the entire multiple variable point static loading device for bridge test works more safely and accurately.
[0041] See also Figure 1 and Figure 2As a specific embodiment of the multiple variable-point static loading device for bridge testing provided by the utility model, the main moving mechanism 3 includes two guide rails 32 and multiple running wheels 33; the two guide rails 32 are arranged in parallel and spaced in the through-hole 21; multiple running wheels 33 are respectively installed on the two guide rails 32; the running wheels 33 are used to move along the guide rails 32; the number of the first lifters 31 is multiple, and they are respectively installed on the multiple running wheels 33; a supporting pad 26 is provided in the through-hole 21, and the two guide rails 32 and the multiple running wheels 33 are respectively installed on both sides of the supporting pad 26; one end of the loading beam 4 is installed on the supporting pad 26; the guide rails 32 are arranged along the length direction of the loading beam 4, and the two guide rails 32 are arranged in parallel and spaced; multiple running wheels 33 are installed on both guide rails 32, and the running wheels 33 move along the length direction of the guide rails 32. A wheel frame is provided on the running wheel 33, and the second lifter 51 is fixedly installed on the wheel frame; the end of the loading beam 4 is installed on multiple second lifters 51, and multiple running wheels 33 are started to move on the guide rail 32, thereby controlling the movement of the loading beam 4. A driving motor is provided on the bracket and connected to the running wheel 33, so as to drive the running wheel 33 to move on the guide rail 32. During the test, the loading beam 4 is supported on the supporting pad 26; when the loading beam 4 needs to be moved, the first lifter 31 is started to lift the loading beam 4 up and above the supporting pad 26.
[0042] See also Figure 1 As a specific embodiment of the multiple variable-point static loading device for bridge testing provided by the utility model, the mounting seat 1 includes two anti-overturning frames 11 respectively mounted on the front and rear ends of the supporting structure 2, and the length direction of the anti-overturning frame 11 is consistent with the length direction of the loading beam 4; the anti-overturning frame 11 is set as a long strip structure, and the length direction is parallel to the length direction of the loading beam 4; the two anti-overturning frames 11 on the same mounting seat 1 are arranged at intervals, the supporting structure 2 is installed between the two anti-overturning frames 11, and the supporting structure 2 is fixedly connected to the two anti-overturning frames 11. By setting along the length direction of the loading beam 4, the eccentricity problem caused by the long loading beam 4 can be effectively prevented, making the entire multiple variable-point static loading device for bridge testing work more stably.
[0043] See also Figure 1As a specific embodiment of the multiple variable-point static loading device for bridge testing provided by the utility model, a first moving wheel 24 is provided at the lower end of the supporting structure 2, and a second moving wheel 12 is provided at the lower end of the anti-overturning frame 11; and a first supporting leg 25 for supporting on the ground is provided on the supporting structure 2, and a second supporting leg 13 for supporting on the ground is provided on the anti-overturning frame 11; the first moving wheel 24 and the second moving wheel 12 are respectively provided on the supporting structure 2 and the anti-overturning frame 11, so as to drive the mounting seat 1 and the bearing structure to move, and then control the loading beam 4, the loading head 6, etc. to move quickly over a long distance. The main moving mechanism 3 is mainly used to drive the loading beam 4 and the loading beam 4 to move accurately over a short distance. After the mounting seat 1 and the supporting structure 2 move to a suitable working position, the first supporting leg 25 and the second supporting leg 13 are started to move downward and supported on the ground, and the first supporting leg 25 and the second supporting leg 13 are both hydraulic mechanical legs.
[0044] Preferably, pads are provided at the lower ends of the first supporting leg 25 and the second supporting leg 13, so that the first supporting leg 25 and the second supporting leg 13 are stably supported on the ground.
[0045] See also Figure 1 As a specific implementation of the multiple variable-point static loading device for bridge testing provided by the utility model, the loading head 6 is located on the side of the auxiliary support mechanism 5 away from the main moving mechanism 3; that is, the auxiliary moving mechanism is located between the main moving mechanism 3 and the loading head 6, so that the loading head 6 can be independent of the end of the loading beam 4, and is not easily affected.
[0046] Preferably, a rubber pad 61 is provided at the lower end of the loading head 6 , and a rubber pad 61 is provided at the lower end of the loading beam 4 .
[0047] See also Figure 1 As a specific implementation of the multiple variable-point static loading device for bridge testing provided by the utility model, a pressure sensor is provided in the loading head 6, and the first lifter 31 and the second lifter 51 are both jacks; the pressure sensor is installed on the loading head 6 so that the force of the loading head 6 acting on the test beam 7 can be accurately detected; the first lifter 31 and the second lifter 51 both use jacks, so that the first lifter 31 and the second lifter 51 are more convenient to install, have a larger bearing capacity, and are safe to use.
[0048] The connection between the mounting seat 1, the main moving mechanism 3, the loading beam 4, the auxiliary support mechanism 5 and the loading head 6 in the multiple variable point static loading device for bridge test provided by the utility model can be bolted or welded. The mounting seat 1, the loading beam 4, etc. are fixed by splicing steel plates.
[0049] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A multiple variable point static loading device for bridge testing, characterized in that: include: A mounting base, used for fixed installation on the ground; a supporting structure is provided on the mounting base; A main moving mechanism is installed on the supporting structure; a first lifter is provided at the upper end of the main moving mechanism; a loading beam arranged horizontally, with one end mounted on the supporting structure and located above the first lifter, and the other end suspended outside the supporting structure; The first lifter is used to drive the loading beam to move up and down; an auxiliary support mechanism, mounted on the other end of the loading beam; the auxiliary support mechanism comprises a second lifter and an auxiliary wheel mounted on the second lifter, and the auxiliary wheel is located at the lower end of the loading beam, and the second lifter is used to drive the auxiliary wheel to move up and down; The loading head is fixedly mounted on the other end of the loading beam and is located on one side of the auxiliary wheel; the test beam is used to be installed below the loading beam and is arranged along the length direction of the loading beam; the loading head is used to apply a force on the test beam from top to bottom.
2. The multiple variable-point static loading device for bridge testing according to claim 1 is characterized in that: The support structure is provided with a through opening, the main moving mechanism is installed on the bottom surface of the through opening, the length direction of the through opening is consistent with the length direction of the loading beam, and the loading beam is installed in the through opening.
3. The multiple variable-point static loading device for bridge testing according to claim 2 is characterized in that: There are two mounting seats arranged at intervals; the supporting structure comprises two supporting columns and a supporting block fixedly installed between the two supporting columns; the through opening is opened on the supporting block.
4. The multiple variable-point static loading device for bridge testing according to claim 2, characterized in that: The main moving mechanism comprises: Two guide rails are arranged in parallel and spaced apart in the through opening; There are multiple running wheels, which are respectively installed on the two guide rails; the running wheels are used to move along the guide rails; there are multiple first lifters, which are respectively installed on the multiple running wheels; A supporting pad is arranged in the through opening, and the two guide rails and the plurality of travel wheels are respectively mounted on both sides of the supporting pad; one end of the loading beam is mounted on the supporting pad.
5. The multiple variable-point static loading device for bridge testing according to claim 1, characterized in that: The mounting seat comprises two anti-overturning frames respectively mounted on the front and rear ends of the supporting structure, and the length direction of the anti-overturning frames is consistent with the length direction of the loading beam.
6. The multiple variable-point static loading device for bridge testing according to claim 5, characterized in that: The lower end of the supporting structure is provided with a first moving wheel, and the lower end of the anti-overturning frame is provided with a second moving wheel; and the supporting structure is provided with a first supporting leg for supporting on the ground, and the anti-overturning frame is provided with a second supporting leg for supporting on the ground.
7. The multiple variable-point static loading device for bridge testing according to claim 6, characterized in that: The lower ends of the first supporting leg and the second supporting leg are both provided with rubber pads.
8. The multiple variable-point static loading device for bridge testing according to claim 1 is characterized in that: The loading head is located at a side of the auxiliary supporting mechanism away from the main moving mechanism.
9. The multiple variable-point static loading device for bridge testing according to claim 1, characterized in that: A rubber pad is provided at the lower end of the loading head.
10. The multiple variable-point static loading device for bridge testing according to claim 1, characterized in that: A pressure sensor is arranged inside the loading head, and both the first lifter and the second lifter are jacks.