Expansion Joint Performance Comprehensive Testing Equipment

Abstract

This utility model discloses a comprehensive testing device for expansion joint performance, comprising a basic frame, a vertical loading system support frame at the top of the basic frame, and platforms A and B at the bottom of the vertical loading system support frame. Platform A has a transverse pulley at its bottom, and platform B has a longitudinal pulley at its bottom. The basic frame has two lead screws, and a vertical loading system is installed at the top of the vertical loading system support frame. The basic frame consists of a crossbeam, a longitudinal beam, and two steel columns, all made of high-strength steel. The two steel columns are welded to the ends of the crossbeam and longitudinal beam, respectively. The transverse pulley is slidably connected to the crossbeam, and the longitudinal pulley is slidably connected to the longitudinal beam. This comprehensive testing device for expansion joint performance can rigorously test the performance of expansion joints, screen out substandard products, and prevent a series of quality accidents caused by expansion joint quality problems.

Description

Technical Field

[0001] This utility model relates to the field of expansion joint performance testing technology, and in particular to a comprehensive expansion joint performance testing device. Background Technology

[0002] In modern transportation infrastructure (such as highways and railway bridges) and building engineering, expansion joints are indispensable and important structural components. Their main function is to absorb and buffer displacement when the structure deforms due to factors such as temperature changes, foundation settlement, and vehicle loads, preventing structural damage due to stress concentration.

[0003] Currently, equipment for testing the performance of expansion joints on the market has many limitations. Most existing testing equipment is single-function; for example, waterproofing testing equipment can only test waterproofing performance, and deformation performance testing equipment and load-bearing performance testing equipment are independent, unable to simultaneously perform a comprehensive performance evaluation of expansion joints. This leads to frequent equipment changes and specimen reinstallation during actual testing, which not only consumes significant time and labor costs, but also may introduce additional errors, affecting the accuracy of the test results. With the industry's ever-increasing demands for engineering quality, there is an urgent need for a comprehensive device capable of efficiently and accurately performing multiple performance tests on expansion joints to meet the growing testing needs and ensure the durability and safety of engineering structures. Utility Model Content

[0004] In order to overcome the shortcomings of the existing technology, one of the purposes of this utility model is to provide a comprehensive testing equipment for expansion joint performance.

[0005] One of the objectives of this utility model is achieved through the following technical solution: The comprehensive testing equipment for expansion joint performance includes a base frame, a vertical loading system support frame at the top of the base frame, an A platform and a B platform at the bottom of the vertical loading system support frame, a transverse pulley at the bottom of the A platform and a longitudinal pulley at the bottom of the B platform, two lead screws on the base frame, and a vertical loading system installed on the top of the vertical loading system support frame.

[0006] Furthermore, the basic frame consists of a crossbeam, a longitudinal beam, and two steel columns. All the crossbeams, longitudinal beams, and two steel columns are made of high-strength steel, and the two steel columns are welded to the ends of the crossbeam and the longitudinal beam, respectively.

[0007] Furthermore, the transverse pulley is slidably connected to the crossbeam, and the longitudinal pulley is slidably connected to the longitudinal beam.

[0008] Furthermore, the lead screw is connected to platform A to form a horizontal loading system, enabling horizontal movement and displacement acquisition of platform A.

[0009] Furthermore, platform A moves laterally, platform B moves longitudinally, and platforms A and B combine to form an expansion joint support platform.

[0010] Furthermore, the vertical loading system support frame is welded from high-strength steel, and the cross-section of the vertical loading system support frame is trapezoidal.

[0011] Compared with the prior art, the beneficial effects of this utility model are: 1. Improve project quality: The comprehensive performance testing equipment for expansion joints can strictly test the performance of expansion joints, screen out unqualified products, and prevent a series of quality accidents caused by expansion joint quality problems.

[0012] 2. Reduce safety risks: The comprehensive performance testing equipment for expansion joints can strictly test the performance of expansion joints, screen out unqualified products, prevent damage to engineering structures and safety accidents caused by quality problems of expansion joints, ensure the quality and safety of transportation infrastructure and construction projects, and safeguard public interests.

[0013] 3. Improved work efficiency: Compared with traditional single-function testing equipment, the comprehensive performance testing time for expansion joints can be shortened by at least 40%. Taking the testing of 20 batches of expansion joint specimens per year as an example, it is estimated that 2,000 hours of testing time can be saved annually, significantly improving the work efficiency of testing agencies, increasing their business capacity, and thus bringing direct economic benefits. Attached Figure Description

[0014] Figure 1 This is a front view of this embodiment; Figure 2 This is the left view of this embodiment; Figure 3 This is a top view of this embodiment; Figure 4 These are front views of platform A and platform B in this embodiment; Figure 5 This is a left view of platform A in this embodiment; Figure 6 This is a top view of platform A and platform B in this embodiment; Figure 7 This is a schematic diagram of the structure in this embodiment where both the lateral and vertical misalignment of the expansion joint are zero. Figure 8 This is a schematic diagram of the bridge expansion joint in the initial state of maximum opening in this embodiment; Figure 9 For this embodiment Figure 8 Top view.

[0015] The diagram is labeled as follows: 1. Horizontal pulley; 2. Longitudinal pulley; 3. Basic frame; 4. Platform A; 5. Platform B; 6. Lead screw; 7. Vertical loading system support frame. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Please see Figure 1-9 This utility model provides a technical solution: a comprehensive testing device for expansion joint performance, including a base frame 3. The base frame 3 consists of a crossbeam, a longitudinal beam, and two steel columns. The crossbeam, longitudinal beam, and two steel columns are all made of high-strength steel. The two steel columns are welded to the ends of the crossbeam and longitudinal beam, respectively. A vertical loading system support frame 7 is provided at the top of the base frame 3. A platform 4 and a platform 5 are provided at the bottom of the vertical loading system support frame 7. A platform 4 is provided with a transverse pulley 1 at the bottom, and a longitudinal pulley 2 is provided at the bottom of the platform 5. The transverse pulley 1 is slidably connected to the crossbeam, and the longitudinal pulley 2 is slidably connected to the longitudinal beam. The platform 4 moves laterally, and the platform 5 moves longitudinally. The platform 4 and platform 5 are combined to form an expansion joint support platform. The foundation frame 3 is equipped with two lead screws 6, which are connected to platform A 4 to form a horizontal loading system, enabling horizontal movement and displacement acquisition of platform A 4. The vertical loading system support frame 7 is mounted on top of the vertical loading system. The vertical loading system support frame 7 is welded from high-strength steel and has a trapezoidal cross-section, which ensures that the vertical loading system support frame 7 is stable, load-bearing, and not easily deformed or moved during use. The function of the expansion joint support platform is to place and fix the expansion joint and to realize the expansion deformation through the movement of the platform. The function of the vertical loading system is to apply vertical force to the expansion joint to realize the load-bearing performance test. The function of the horizontal loading system is to realize the tensile and compressive deformation of the expansion joint.

[0018] Improving project quality: The use of comprehensive testing equipment for expansion joint performance can strictly test the performance of expansion joints, screen out unqualified products, and prevent a series of quality accidents caused by expansion joint quality problems.

[0019] Reduce safety risks: The use of comprehensive testing equipment for expansion joint performance can strictly test the performance of expansion joints, screen out unqualified products, prevent damage to engineering structures and safety accidents caused by expansion joint quality problems, ensure the quality and safety of transportation infrastructure and construction projects, and safeguard public interests.

[0020] Improved work efficiency: Compared to traditional single-function testing equipment, it can shorten the comprehensive performance testing time of expansion joints by at least 40%. Taking the testing of 20 batches of expansion joint specimens per year as an example, it is estimated that 2,000 hours of testing time can be saved annually, which will greatly improve the work efficiency of testing agencies, increase their business capacity, and thus bring direct economic benefits.

[0021] Working principle: With both lateral and vertical misalignment of the expansion joint at zero, the modular bridge expansion joint completes one maximum closure and maximum opening cycle. This can be achieved through a horizontal loading system, such as... Figure 7 .

[0022] With the bridge expansion joint initially in its maximum open state, maximum lateral misalignment is applied. This maximum lateral misalignment should meet the requirement that the deviation at both ends of the expansion joint is ≥20×n (mm), where n is the number of rubber sealing strips in the bridge expansion joint. Vertical misalignment is zero. This allows the bridge expansion joint to complete one maximum closure and maximum opening cycle. Lateral misalignment can be achieved by moving the expansion joint support platform. Figure 8 .

[0023] With the bridge expansion joint initially in its maximum opening state, apply maximum vertical misalignment. This maximum vertical misalignment should meet the requirement of a longitudinal slope ≥5%, while the lateral misalignment is zero. This allows the bridge expansion joint to complete one maximum closure and maximum opening cycle. Vertical misalignment can be achieved by moving the expansion joint support platform up and down. Figure 9 .

[0024] Design wheel load P d A load of 140 kN was applied at a bias angle of 16.7°, divided into 10 loading cycles. Each cycle applied 14 kN at a rate of 1 kN / s. After each loading cycle, the sample was allowed to stand for 5 minutes. The vertical deflection of the bridge expansion joint was then measured using a displacement gauge and vernier calipers and recorded as h (m). If h > L / 600 (where L is the calculated span of the bridge; for simply supported and continuous structures, the calculated span is the support spacing; for cantilever structures, the calculated span is twice the cantilever length), the load-bearing capacity of the sample does not meet the requirements. After the 10th loading cycle, the vertical deflection h of the modular bridge expansion joint was measured after a 5-minute stand. If h ≤ L / 600, the load-bearing capacity of the sample meets the requirements.

[0025] When simulating wheel load fatigue, a vertical force is applied with a cyclic amplitude of 0 to Pd, and a force of 2 × 10⁻⁶ is applied. 6 Next, measure the stress changes of the bridge expansion joint and observe whether the expansion joint has cracked; if no fatigue cracks appear, the fatigue performance of the expansion joint meets the requirements.

[0026] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0030] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0031] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A device for the performance of a joint, comprising a base frame (3), characterised in that: The top of the basic frame (3) is provided with a vertical loading system support frame (7), and the bottom of the vertical loading system support frame (7) is provided with platform A (4) and platform B (5). The bottom of platform A (4) is provided with a horizontal pulley (1), and the bottom of platform B (5) is provided with a longitudinal pulley (2). The basic frame (3) is provided with two lead screws (6), and the top of the vertical loading system support frame (7) is equipped with a vertical loading system.

2. The performance integrated test device for expansion joint as claimed in claim 1, wherein: The basic frame (3) consists of a crossbeam, a longitudinal beam and two steel columns. The crossbeam, longitudinal beam and two steel columns are all made of high-strength steel. The two steel columns are welded to the ends of the crossbeam and the longitudinal beam respectively.

3. The performance integrated test device for expansion joint as claimed in claim 2, wherein: The transverse pulley (1) is slidably connected to the crossbeam, and the longitudinal pulley (2) is slidably connected to the longitudinal beam.

4. The performance integrated test device for expansion joint as claimed in claim 1 wherein: The lead screw (6) is connected to platform A (4) to form a horizontal loading system, which realizes the horizontal movement and displacement acquisition of platform A (4).

5. The performance integrated testing apparatus for expansion joints as claimed in claim 1 wherein: Platform A (4) moves laterally, and platform B (5) moves longitudinally. Platform A (4) and platform B (5) are combined to form an expansion joint support platform.

6. The performance integrated testing apparatus for expansion joints as claimed in claim 1 wherein: The vertical loading system support frame (7) is welded from high-strength steel, and the cross-section of the vertical loading system support frame (7) is trapezoidal.

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