A test frame for bridge static load test

Abstract

This utility model discloses a test frame for static load testing of bridges, including a reaction frame. A first slide rail is installed on the top inner side of the reaction frame, and multiple movable frames are slidably connected to the first slide rail. Turnbuckles are installed below each of the multiple movable frames, and jack beams are installed at the bottom ends of each of the multiple turnbuckles. By cooperating with the first slide rail on the top inner side of the reaction frame and the movable frames, and combined with the rollers at both ends of the jack beams, the test position can be adjusted without removing bolts or cutting welded joints. Simply sliding the movable frames and loosening the turnbuckles will move the jack beams, allowing for quick adaptation to different test points on the bridge. This avoids the repetitive disassembly and assembly procedures of traditional rigid connections, significantly shortens the adjustment cycle, and reduces manpower input.

Description

Technical Field

[0001] This utility model relates to the field of bridge static load testing technology, specifically a test frame for bridge static load testing. Background Technology

[0002] Static load testing of bridges is a core means of evaluating the load-bearing capacity of bridge structures, verifying the rationality of design, and ensuring operational safety. As a key load-bearing and loading support device in the testing process, the structural rationality, ease of operation, and stability of the test frame directly affect the test efficiency and data accuracy.

[0003] However, the mainstream bridge static load testing frames currently on the market generally have significant drawbacks. Traditional test frames often use a rigid fixed connection design between the reaction frame and the jack beam, typically secured by multiple sets of high-strength bolts or directly welded together, making it impossible to flexibly adjust their relative positions. When loading tests need to be conducted on different test points of the bridge (such as multiple stress sections within the same span or key parts of different spans), all connecting bolts must be removed or welded joints cut before repositioning, reassembling, and calibrating. This entire adjustment process requires a large amount of manpower and is time-consuming, severely slowing down the testing progress.

[0004] Therefore, there is an urgent need to develop a test frame that can flexibly adjust the test position, does not require repeated disassembly and assembly, has a stable structure, and is highly versatile, in order to solve the current pain points in the industry and improve the efficiency and reliability of bridge static load tests. Summary of the Invention

[0005] The purpose of this utility model is to provide a test frame for static load testing of bridges to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a test frame for static load testing of bridges, including a reaction frame, a first slide rail installed on the top inner side of the reaction frame, a plurality of movable frames slidably connected on the first slide rail, turnbuckles installed below the plurality of movable frames, and jack beams installed at the bottom ends of the plurality of turnbuckles.

[0007] The jack beam is located below the reaction frame. Two support frames are symmetrically installed at both ends of the jack beam. Rollers are installed on the adjacent side of the two support frames to restrict the position of the jack beam and facilitate its movement.

[0008] Preferably, both the first slide rail and the reaction frame are made of Q235 I-beams.

[0009] Preferably, the reaction frame is made of multiple I-beams welded together, and the first slide rail is welded to the center of the inner top of the reaction frame along the length of the reaction frame.

[0010] Preferably, the roller is located in the grooves of the I-shaped steel on both sides of the bottom of the reaction frame, and the size of the roller is smaller than the height of the grooves of the I-shaped steel of the reaction frame.

[0011] Preferably, the turnbuckle includes a bolt frame, both ends of which are provided with internal threaded holes, and a first adjusting threaded rod and a second adjusting threaded rod are respectively threaded onto the internal threaded holes at both ends of the bolt frame.

[0012] Preferably, the first adjusting threaded rod is installed on the lower surface of the movable frame, and the second adjusting threaded rod is installed on the upper surface of the jack beam.

[0013] Compared with the prior art, the beneficial effects of this utility model are: by cooperating with the first slide rail on the top of the inner side of the reaction frame and the moving frame, combined with the rollers at both ends of the jack beam, when adjusting the test position, there is no need to remove bolts or cut welding nodes. Only by sliding the moving frame and loosening the turnbuckle bolts can the jack beam be moved, which can quickly adapt to different test points on the bridge, avoid the repeated disassembly and assembly process of traditional rigid connections, significantly shorten the adjustment cycle, and reduce manpower input. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a bottom view of the structure of this utility model;

[0016] Figure 3 This is a schematic diagram of the structure of the first slide rail of this utility model;

[0017] Figure 4 This is a schematic diagram of the structure of the jack beam and turnbuckle of this utility model;

[0018] Figure 5 This is a side view of the structure of this utility model.

[0019] In the diagram: 1. Reaction frame; 2. First slide rail; 3. Jack beam; 4. Turnbuckle; 41. Bolt bracket; 42. First adjusting threaded rod; 43. Second adjusting threaded rod; 5. Moving frame; 6. Support frame; 7. Roller. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0021] Please see Figure 1-5This utility model provides a technical solution: a test frame for static load testing of bridges, including a reaction frame 1. A first slide rail 2 for guiding the sliding of moving parts is fixedly installed on the top inner side of the reaction frame 1. Multiple moving frames 5 are slidably connected on the first slide rail 2. The number of moving frames 5 can be flexibly adjusted according to the load distribution requirements of the static load test of bridges.

[0022] Multiple movable frames 5 are fixedly installed with turnbuckles 4 at their bottom ends. The bottom ends of the turnbuckles 4 are fixedly connected to the jack beam 3 used to install the jacks. The turnbuckles 4 are used to tighten the jack beam 3 and restrict its position. The jack beam 3 is located below the reaction frame 1. Two support frames 6 are symmetrically installed at both ends of the jack beam 3 for support and guidance. Rollers 7 are rotatably installed on the adjacent side of the two support frames 6. The rollers 7 can restrict the position of the jack beam 3 when tightening it to avoid deviation of the jack beam 3, and reduce the frictional resistance between the jack beam 3 and the reaction frame 1 when the jack beam 3 moves, so as to facilitate quick adjustment of the position of the jack beam 3 according to different test points on the bridge.

[0023] like Figure 1 and Figure 2 As shown: Both the first slide rail 2 and the reaction frame 1 are made of Q235 I-beams, which possess excellent mechanical properties. The reaction frame 1 is constructed by welding multiple I-beams together using a full-weld process. The weld height is no less than half the thickness of the web of the I-beam, and the weld length covers the entire area of ​​the I-beam connection surface, ensuring the load-bearing capacity of the welded joint and preventing deformation or collapse of the reaction frame 1 due to weld failure during testing. The first slide rail 2 is welded along the length of the reaction frame 1 to the center of the inner top of the reaction frame 1. This welding position ensures that the moving frame 5 remains centered on the reaction frame 1 when sliding along the first slide rail 2.

[0024] like Figure 3 and Figure 5 As shown: Roller 7 is located in the grooves of the I-shaped steel on both sides of the bottom of the reaction frame 1. The grooves of the I-shaped steel on both sides of the bottom of the reaction frame 1 provide a stable guide track for roller 7, which can limit the displacement of roller 7. The size of roller 7 is smaller than the height of the groove of the I-shaped steel in the reaction frame 1. When the jack beam 3 is not tightened, roller 7 can contact the lower surface of the groove of the I-shaped steel, thereby ensuring the movement of jack beam 3. At the same time, when jack beam 3 is tightened, it can avoid interference between roller 7 and I-shaped steel.

[0025] like Figure 4As shown: The turnbuckle 4 includes a bolt holder 41 for connecting two threaded rods. Both ends of the bolt holder 41 have internal threaded holes, with the threads at both ends having opposite directions: one end is a left-hand thread, and the other end is a right-hand thread. A first adjusting threaded rod 42 and a second adjusting threaded rod 43 are threadedly connected to the internal threaded holes at both ends of the bolt holder 41, respectively. When the bolt holder 41 is rotated clockwise or counterclockwise, the first adjusting threaded rod 42 and the second adjusting threaded rod 43 can simultaneously retract inwards or extend outwards, thus adjusting the overall length of the turnbuckle 4. When retracted, it tightens and limits the jack beam 3; when extended, it allows the jack beam 3 to move left and right.

[0026] like Figure 4 As shown: the first adjusting threaded rod 42 is fixedly connected to the lower surface of the moving frame 5 by bolts through the flange, and the second adjusting threaded rod 43 is also bolted to the upper surface of the jack beam 3 through the flange. The flange connection facilitates the disassembly and replacement of the turnbuckle 4. When a turnbuckle 4 is damaged, it is not necessary to disassemble the entire test frame. Only the damaged part needs to be replaced, which reduces maintenance costs and downtime.

[0027] Working principle: First, based on the load distribution requirements of the bridge test points, the moving frame 5 is initially adjusted to the position corresponding to the test points via the first slide rail 2 welded at the center of the top of the inner side of the reaction frame 1. Simultaneously, the moving frame 5 can move the jack beam 3, which houses the jacks, via turnbuckles 4. Because rollers 7 are symmetrically installed at both ends of the jack beam 3, and these rollers 7 are embedded in the grooves of the I-beams on both sides of the bottom of the reaction frame 1, the rollers 7 can roll along the grooves, thus quickly adjusting the jack beam 3 to the longitudinal position corresponding to the test points. At the same time, the rollers 7 also limit the offset of the jack beam 3, ensuring adjustment accuracy.

[0028] Once the jack beam 3 is positioned correctly, it is necessary to secure it. First, rotate the bolt holder 41 of the turnbuckle 4. This causes the first adjusting threaded rod 42 and the second adjusting threaded rod 43, connected at both ends, to retract synchronously into the bolt holder 41, thereby tightening the jack beam 3. This ensures that the upper surface of the jack beam 3 is tightly fitted against the lower surface of the reaction frame 1, thus stably fixing the jack beam 3 in the designated test position and providing stable support for subsequent loading tests. After installing the jack between the lower surface of the jack beam 3 and the bridge, apply a static load to the test area of ​​the bridge using the jack.

[0029] When the test point needs to be changed, rotate the bolt holder 41 of the turnbuckle 4 in the reverse direction so that the first adjusting threaded rod 42 and the second adjusting threaded rod 43 extend outward from the bolt holder 41, thereby releasing the tension on the jack beam 3. Then repeat the steps of position adjustment and tensioning, adjust the jack beam 3 to the new test point, and then fix it again before proceeding to the next static load test.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A test frame for static load testing of bridges, comprising a reaction frame (1), characterized in that: The inner top of the reaction frame (1) is equipped with a first slide rail (2), and multiple movable frames (5) are slidably connected on the first slide rail (2). Turnbuckles (4) are installed below the multiple movable frames (5), and jack beams (3) are installed at the bottom of the multiple turnbuckles (4). The jack beam (3) is located below the reaction frame (1). Two support frames (6) are symmetrically installed at both ends of the jack beam (3). Rollers (7) are installed on the adjacent side of the two support frames (6) to restrict the position of the jack beam (3) and facilitate its movement.

2. The test frame for static load testing of bridges according to claim 1, characterized in that: The first slide rail (2) and the reaction frame (1) are both made of Q235 I-beams.

3. The test frame for static load testing of bridges according to claim 2, characterized in that: The reaction frame (1) is made of multiple I-beams welded together, and the first slide rail (2) is welded to the center of the top inner side of the reaction frame (1) along the length of the reaction frame (1).

4. The test frame for static load testing of bridges according to claim 2, characterized in that: The roller (7) is located in the groove of the I-shaped steel on both sides of the bottom of the reaction frame (1), and the size of the roller (7) is smaller than the height of the groove of the I-shaped steel of the reaction frame (1).

5. The test frame for static load testing of bridges according to claim 1, characterized in that: The turnbuckle (4) includes a bolt bracket (41), both ends of which are provided with internal threaded holes. A first adjusting threaded rod (42) and a second adjusting threaded rod (43) are respectively threaded onto the internal threaded holes at both ends of the bolt bracket (41).

6. A test frame for static load testing of bridges according to claim 5, characterized in that: The first adjusting threaded rod (42) is installed on the lower surface of the movable frame (5), and the second adjusting threaded rod (43) is installed on the upper surface of the jack beam (3).

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