A device for cyclic horizontal and vertical loading test of expansion joint assembly

Abstract

The utility model discloses a kind of expansion joint assembly cyclic horizontal vertical loading test devices, including test bearing platform, expansion joint assembly, gap adjusting mechanism and pavement accelerated loading system.Expansion joint assembly includes the fixed end on the test bearing platform of gap setting and the sliding end oppositely arranged with the fixed end;Gap adjusting mechanism is connected with the sliding end, for driving the sliding end relative to the fixed end sliding, pavement accelerated loading system is used to the fixed end and the sliding end synchronous exert dynamic vertical load.This expansion joint assembly cyclic horizontal vertical loading test device, can realize the time-domain synchronous loading of horizontal displacement and vertical load, solve the technical problem of single load dimension of traditional test device.

Description

Technical Field

[0001] This utility model relates to the field of engineering construction technology, specifically to a test device for cyclic horizontal and vertical loading of expansion joint components. Background Technology

[0002] In the field of bridge and building structural engineering, expansion joint components, as key parts for coordinating structural deformation, directly impact the safety of engineering structures through testing their dynamic fatigue performance and multi-bearing load capacity. Currently, the industry commonly uses static loading testing systems...

[0003] Traditional testing machines typically use independent hydraulic cylinders to apply horizontal tension or vertical pressure separately, which cannot simulate the coupling effect of horizontal displacement and vertical impact when a vehicle passes through. At the same time, the size of the expansion joint assembly is also fixed, so it cannot simulate the cracking of the interface between the new and old expansion joint assemblies, vertical deformation, changes in horizontal tension, etc., and therefore cannot test the crack resistance and durability of different materials or structures of expansion joint assemblies under actual use conditions. Utility Model Content

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a cyclic horizontal and vertical loading test device for expansion joint components, which can achieve synchronous loading of horizontal displacement and vertical load in the time domain, thus solving the technical problem of the single load dimension in traditional test devices.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a cyclic horizontal and vertical loading test device for expansion joint components, comprising:

[0006] Test platform;

[0007] An expansion joint assembly includes a fixed end on the test bearing platform with a gap and a sliding end disposed opposite to the fixed end;

[0008] A gap adjustment mechanism, connected to the sliding end, is used to drive the sliding end to slide relative to the fixed end; and

[0009] A road surface acceleration loading system is used to simultaneously apply dynamic vertical loads to the fixed end and the sliding end.

[0010] Furthermore, the gap adjustment mechanism includes a horizontal slide table and a horizontal linear motion drive source. The sliding end is disposed on the test support platform via the horizontal slide table. The horizontal slide table can slide along the top surface of the test support platform. The horizontal linear motion drive source is used to drive the horizontal slide table to slide horizontally relative to the fixed end.

[0011] Furthermore, the gap adjustment mechanism also includes a guide member, which is disposed on the top surface of the test bearing platform and connected to the power output shaft of the horizontal linear motion drive source, for guiding the power output shaft of the horizontal linear motion drive source.

[0012] Furthermore, the guide includes two rows of parallel V-shaped guide rails, which are parallel to the power output shaft of the horizontal linear motion drive source. A guide roller assembly is mounted at the end of the power output shaft of the horizontal linear motion drive source, and the outer edges of the rollers in the guide roller assembly form rolling contact with the 60° inclined surface of the V-shaped guide rails.

[0013] Furthermore, the road surface accelerated loading system includes an expansion joint assembly arranged in a vertical plane, a circular acceleration track, a composite loading roller assembly, and a track drive mechanism. The composite loading roller assembly includes at least two pressure-bearing rollers evenly distributed along the circumferential direction. The acceleration track includes two horizontal sections and two semi-circular transition sections. The two horizontal sections are spaced apart vertically, and the two semi-circular transition sections are connected between the two horizontal sections. The track drive mechanism is used to drive the composite loading roller assembly to circulate within the circular acceleration track, and when the composite loading roller assembly rolls into the lower horizontal section, it can adhere to the fixed end and be fixed.

[0014] Furthermore, the track drive mechanism includes:

[0015] A rotary motor is fixedly installed at the top of the annular acceleration track;

[0016] Synchronous belt drive assembly, comprising a driving pulley, a driven pulley, and a high-strength synchronous toothed belt;

[0017] The actuating element has a radially extending rod-shaped structure. One end of it is fixed to the hub of the driven pulley, and the other end is provided with a roller contact surface. When the pressure roller runs to the junction of the horizontal section and the semi-circular transition track section, the roller contact surface and the outer edge of the pressure roller form a rolling friction transmission.

[0018] Furthermore, it also includes a load-distribution transition plate, which covers the upper surface of the expansion joint assembly, and the composite loading roller assembly is loaded on the load-distribution transition plate.

[0019] The beneficial effects of this utility model are:

[0020] The aforementioned test apparatus for cyclic horizontal and vertical loading of expansion joint components includes a test bearing platform, expansion joint components, a gap adjustment mechanism, and a road surface acceleration loading system.

[0021] Specifically, the expansion joint assembly includes a fixed end on a test bearing platform with a gap setting and a sliding end opposite to the fixed end. A gap adjustment mechanism is connected to the sliding end and is used to drive the sliding end to slide relative to the fixed end; a road surface acceleration loading system is used to apply dynamic vertical loads to the fixed end and the sliding end simultaneously.

[0022] During the test, the gap adjustment mechanism drove the sliding end to make horizontal displacement to simulate the thermal expansion and contraction effect of the bridge; the road surface accelerated loading system simultaneously applied vertical impact load to reproduce the combined stress state when vehicles pass through.

[0023] The cyclic horizontal and vertical loading test device for this expansion joint component can achieve synchronous loading of horizontal displacement and vertical load in the time domain, solving the technical problem of the single load dimension of traditional test devices. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of this utility model, the accompanying drawings used in the specific embodiments will be briefly described below. In all the drawings, the elements or parts are not necessarily drawn to scale.

[0025] Figure 1 A schematic diagram of a cyclic horizontal and vertical loading test device for an expansion joint assembly provided in an embodiment of this utility model;

[0026] Figure label:

[0027] 100. Test bearing platform; 200. Expansion joint assembly; 210. Fixed end; 220. Sliding end; 300. Gap adjustment mechanism; 310. Horizontal slide table; 320. Horizontal linear motion drive source; 330. Guide component; 400. Road surface acceleration loading system; 410. Circular acceleration track; 411. Horizontal section; 412. Transition track section; 420. Composite loading roller assembly; 430. Track drive mechanism; 431. Rotary motor; 432. Synchronous belt drive assembly; 433. Actuating component; 500. Load distribution transition plate. Detailed Implementation

[0028] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the invention; therefore, the invention is not limited to the specific embodiments disclosed below.

[0029] Please see Figure 1This utility model provides a test device for cyclic horizontal and vertical loading of expansion joint components, including a test bearing platform 100, an expansion joint component 200, a gap adjustment mechanism 300, and a road surface acceleration loading system 400.

[0030] Specifically, the expansion joint assembly 200 includes a fixed end 210 on a test bearing platform 100 with a gap setting and a sliding end 220 disposed opposite to the fixed end 210. The gap adjustment mechanism 300 is connected to the sliding end 220 and is used to drive the sliding end 220 to slide relative to the fixed end 210; the road surface acceleration loading system 400 is used to apply dynamic vertical loads to the fixed end 210 and the sliding end 220 simultaneously.

[0031] During the test, the gap adjustment mechanism 300 drives the sliding end 220 to make horizontal displacement to simulate the thermal expansion and contraction effect of the bridge; the road surface acceleration loading system 400 simultaneously applies vertical impact load to reproduce the combined force state when vehicles pass through.

[0032] The cyclic horizontal and vertical loading test device for this expansion joint component can achieve synchronous loading of horizontal displacement and vertical load in the time domain, solving the technical problem of the single load dimension of traditional test devices.

[0033] Specifically, the gap adjustment mechanism 300 includes a horizontal slide 310 and a horizontal linear motion drive source 320. The sliding end 220 is mounted on the test support platform 100 via the horizontal slide 310, and the horizontal slide 310 can slide along the top surface of the test support platform 100. The horizontal linear motion drive source 320 is used to drive the horizontal slide 310 to slide horizontally relative to the fixed end 210. In specific implementations, the horizontal linear motion drive source 320 can be a hydraulic servo actuator commonly used in the prior art. Of course, other mechanisms can be selected, such as a servo electric cylinder.

[0034] In this embodiment, the gap adjustment mechanism 300 further includes a guide 330, which is disposed on the top surface of the test bearing platform 100 and connected to the power output shaft of the horizontal linear motion drive source 320, for guiding the power output shaft of the horizontal linear motion drive source 320.

[0035] Specifically, the guide member 330 includes two rows of parallel V-shaped guide rails, which are parallel to the power output shaft of the horizontal linear motion drive source 320. A guide roller assembly is mounted at the end of the power output shaft of the horizontal linear motion drive source 320, and the outer edge of the rollers in the guide roller assembly forms rolling contact with the 60° inclined surface of the V-shaped guide rails.

[0036] When the push rod 322 extends or retracts, the 60° inclined surface of the V-shaped guide rail 331 and the line contact structure with the roller decompose the lateral force into normal and tangential components. The eccentric load torque is offset by rolling friction, which reduces the coefficient of sliding friction and reduces the driving force loss compared to traditional guide rails.

[0037] In this embodiment, the road surface acceleration loading system 400 includes an expansion joint assembly 200 disposed in a vertical plane, an annular acceleration track 410, a composite loading roller assembly 420, and a track drive mechanism 430. The composite loading roller assembly 420 includes at least two pressure-bearing rollers evenly distributed along the circumferential direction. The acceleration track includes two horizontal sections 411 and two semi-circular transition sections 412. The two horizontal sections 411 are spaced apart vertically, and the two semi-circular transition sections 412 are connected between the two horizontal sections 411. The track drive mechanism 430 is used to drive the composite loading roller assembly 420 to circulate within the annular acceleration track 410. When the composite loading roller assembly 420 rolls into the lower horizontal section 411, it can roll along the surface of the fixed end 210.

[0038] When the composite loading roller runs to the lower horizontal track section 411, it applies vertical pressure to the expansion joint assembly 200; when the roller enters the semi-circular transition track section 412, the centrifugal force is perpendicular to the track plane, causing the contact pressure between the roller and the expansion joint assembly to gradually decrease to zero.

[0039] Specifically, the track drive mechanism 430 includes a rotary motor 431, a synchronous belt drive assembly 432, and an actuating element 433. Specifically, the rotary motor 431 is fixedly mounted on the top of the annular acceleration track 410. The synchronous belt drive assembly 432 includes a driving pulley, a driven pulley, and a high-strength synchronous toothed belt. The actuating element 433 has a radially extending rod-like structure, with one end fixed to the driven pulley hub and the other end having a roller contact surface. When the pressure roller runs to the junction of the horizontal section 411 and the semi-circular transition track section 412, the roller contact surface forms a rolling friction transmission with the outer edge of the pressure roller.

[0040] In use, when the pressure roller approaches the horizontal-semi-circular track joint, the curved surface of the actuating element 433 contacts the outer edge of the roller, compensating for speed fluctuations through friction transmission. This allows the pressure roller to enter the next cycle.

[0041] In a preferred embodiment, the device further includes a load distribution transition plate 500, which covers the upper surface of the expansion joint assembly 200, and the composite loading roller assembly 420 is loaded on the load distribution transition plate 500.

[0042] During use, the concentrated load of the composite loading roller assembly 420 is distributed into a surface load by the load distribution transition plate 500, which can prevent the expansion joint assembly 200 from being subjected to localized concentrated force and avoid crushing of the specimen surface.

[0043] The above-mentioned method of using the cyclic horizontal and vertical loading test device for expansion joint components:

[0044] In use, the distance between the fixed end 210 and the sliding end 220 of the expansion joint assembly 200 is first adjusted by the horizontal linear motion drive source 320. Then, the track drive mechanism 430 is started to drive the composite loading roller group 420 to circulate and roll in the annular acceleration track 410 to reproduce the composite force state when the vehicle passes through.

[0045] During the experiment, the specific size of the expansion joint can be adjusted by the horizontal linear motion drive source 320. At the same time, expansion joint components 200 made of different materials can be replaced. In addition, the parameters of the expansion joint components 200 under different states can be generated by changing the speed of the rotary motor 431, providing more comprehensive experimental data.

[0046] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A device for cyclic horizontal and vertical loading testing of expansion joint assemblies, characterized by, include: Test platform; An expansion joint assembly includes a fixed end on the test bearing platform with a gap and a sliding end disposed opposite to the fixed end; A gap adjustment mechanism, connected to the sliding end, is used to drive the sliding end to slide relative to the fixed end; and A road surface acceleration loading system is used to simultaneously apply dynamic vertical loads to the fixed end and the sliding end.

2. The expansion joint assembly cyclic horizontal and vertical loading test apparatus of claim 1, wherein, The gap adjustment mechanism includes a horizontal slide table and a horizontal linear motion drive source. The sliding end is mounted on the test support platform via the horizontal slide table. The horizontal slide table can slide along the top surface of the test support platform. The horizontal linear motion drive source is used to drive the horizontal slide table to slide horizontally relative to the fixed end.

3. The expansion joint assembly cyclic horizontal and vertical loading test apparatus of claim 2, wherein, The gap adjustment mechanism also includes a guide member, which is disposed on the top surface of the test bearing platform and connected to the power output shaft of the horizontal linear motion drive source, for guiding the power output shaft of the horizontal linear motion drive source.

4. The expansion joint assembly cyclic horizontal and vertical loading test apparatus of claim 3, wherein, The guide includes two parallel rows of V-shaped guide rails, which are parallel to the power output shaft of the horizontal linear motion drive source. A guide roller assembly is mounted at the end of the power output shaft of the horizontal linear motion drive source, and the outer edges of the rollers in the guide roller assembly form rolling contact with the 60° inclined surface of the V-shaped guide rails.

5. The expansion joint assembly cyclic horizontal and vertical loading test apparatus of claim 1, wherein, The road surface acceleration loading system includes an expansion joint assembly arranged in a vertical plane, a circular acceleration track, a composite loading roller assembly, and a track drive mechanism. The composite loading roller assembly includes at least two pressure-bearing rollers evenly distributed along the circumference. The acceleration track includes two horizontal sections and two semi-circular transition sections. The two horizontal sections are spaced apart vertically, and the two semi-circular transition sections are connected between the two horizontal sections. The track drive mechanism is used to drive the composite loading roller assembly to circulate within the circular acceleration track, and when the composite loading roller assembly rolls into the lower horizontal section, it can adhere to the fixed end and be fixed.

6. The expansion joint assembly cyclic horizontal and vertical loading test apparatus of claim 5, wherein, The track drive mechanism includes: A rotary motor is fixedly installed at the top of the annular acceleration track; Synchronous belt drive assembly, comprising a driving pulley, a driven pulley, and a high-strength synchronous toothed belt; The actuating element has a radially extending rod-shaped structure. One end of it is fixed to the hub of the driven pulley, and the other end is provided with a roller contact surface. When the pressure roller runs to the junction of the horizontal section and the semi-circular transition track section, the roller contact surface and the outer edge of the pressure roller form a rolling friction transmission.

7. The expansion joint assembly cyclic horizontal and vertical loading test apparatus of claim 5, wherein, It also includes a load distribution transition plate, which covers the upper surface of the expansion joint assembly, and the composite loading roller assembly is loaded on the load distribution transition plate.

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