A joint vibration simulation device

Abstract

The utility model provides a kind of joint vibration simulation device, belong to bridge technical field.The utility model provides the joint vibration simulation device including test bench, concrete slab, fixed assembly and vibration loading assembly concrete slab includes first concrete slab unit, the second concrete slab unit that is formed spliced joint with first concrete slab unit interval and the connecting reinforcement of connecting first concrete slab unit and second concrete slab unit, first concrete slab unit simulates newly-built bridge, second concrete slab unit simulates existing bridge, spliced joint simulates the joint between newly-built bridge and existing bridge, and connecting reinforcement simulates the reinforcing bar that newly-built bridge and existing bridge are overlapped between;Fixed assembly respectively fixes first concrete slab unit and second concrete slab unit on two test benches;Vibration loading assembly is connected with first concrete slab unit, drives first concrete slab unit vibration.The utility model can simulate the influence of vibration on joint when old bridge reconstruction, expansion.

Description

Technical Field

[0001] This utility model belongs to the field of bridge technology, specifically relating to a joint vibration simulation device. Background Technology

[0002] In bridge construction, the primary function of joints is to connect prefabricated beams, allowing internal forces (such as bending moment, shear force, and axial force) to be smoothly transferred through the joints. This enables multiple independent beams to work together to form a complete bridge structure that shares the load. Considering local traffic conditions and pressures, existing bridges are not closed to traffic during bridge expansion. However, the presence of vehicles causes existing bridges to vibrate at certain frequencies. When connecting these existing bridges to the new bridge via joint construction, this vibration will affect both the joints and the new bridge. To study this impact, simulations are necessary.

[0003] To accurately simulate the vibration frequency of existing bridges, experiments can be conducted directly on the construction site, yielding results that best reflect reality. However, this method has the following drawbacks: 1. Large workload and low economic efficiency: On the construction site, it is necessary to set up scaffolding, pour joint concrete, etc., and also to transport materials and prefabricated beams and slabs. The whole process requires a lot of manpower and material resources, resulting in low economic efficiency. 2. Increased safety risks: Vehicles travel on the bridge construction site, and conducting experiments there will increase traffic risks.

[0004] Therefore, it is necessary to provide a joint vibration simulation device to solve the above problems. Utility Model Content

[0005] This utility model provides a joint vibration simulation device, which can simulate the impact of vibration on joints during the reconstruction and expansion of old bridges. It reduces the workload and time of joint vibration simulation, improves its economy, and reduces safety risks, thereby effectively solving at least one of the technical problems involved in the background art.

[0006] To solve the above-mentioned technical problems, this utility model is implemented as follows: A joint vibration simulation device, comprising: Test bench; A concrete slab includes a first concrete slab unit, a second concrete slab unit that forms a splice joint with the first concrete slab unit at intervals, and connecting steel bars disposed in the splice joint and connecting the first concrete slab unit and the second concrete slab unit. The first concrete slab unit is used to simulate an existing bridge, the second concrete slab unit is used to simulate a newly built bridge, the splice joint is used to simulate the joint between the newly built bridge and the existing bridge, and the connecting steel bars are used to simulate the lapped steel bars between the newly built bridge and the existing bridge. A fixing assembly is used to fix the first concrete slab unit and the second concrete slab unit onto the two test benches respectively; A vibration loading assembly is connected to the first concrete slab unit and is used to drive the first concrete slab unit to vibrate.

[0007] As a preferred improvement, the test bench is mounted on the installation platform, and the two test benches are spaced apart and at the same height.

[0008] As a preferred improvement, the fixing assembly includes a first fixing member and a first bolt. The first fixing member is disposed above the concrete slab and cooperates with the test bench to clamp the concrete slab. The bottom end of the first bolt is anchored to the mounting platform, and the top end is connected to the first fixing member.

[0009] As a preferred improvement, the first bolt includes a matching first screw and a first nut. The head of the first screw is anchored to the mounting platform, and the shank passes through the first fixing member and protrudes above the first fixing member. The first nut is connected to the shank of the first screw and abuts against the top surface of the first fixing member, cooperating with the test bench to clamp the concrete slab. The first nut is used to adjust the clamping degree of the first fixing member and the test bench on the concrete slab, thereby changing the vibration frequency and vibration amplitude of the concrete slab.

[0010] As a preferred improvement, the contact surface between the first fastener and the concrete slab is a plane.

[0011] As a preferred improvement, the bottom end of the first bolt is provided with a second fixing member for anchoring with the mounting platform. The mounting platform is provided with a slot, which is formed inside the mounting platform and communicates with the outside through an opening. The extension direction of the opening is a first direction. The second fixing member is disposed in the slot. The first bolt passes through the opening and is connected to the second fixing member. The second fixing member extends in the slot along a second direction. The first direction and the second direction are perpendicular.

[0012] As a preferred improvement, the concrete slab extends along a first direction, and the first fastener extends along a second direction.

[0013] As a preferred improvement, the vibration loading assembly includes a fixed structure and a vibrator, wherein the fixed structure is fixed to the first concrete slab unit, and the vibrator is fixed to the fixed structure.

[0014] As a preferred improvement, the fixing structure includes a first fixing plate, a second fixing plate, and a second bolt. The first fixing plate and the second fixing plate are located on the upper and lower sides of the first concrete slab unit, respectively. The second bolt connects the first fixing plate and the second fixing plate, and the vibrator is fixed to the first fixing plate.

[0015] As a preferred improvement, rubber pads are provided at the contact points between the concrete slab and the test bench, the first fixing member, the first fixing plate, and the second fixing plate.

[0016] The beneficial effects of this utility model are as follows: (1) Reduced workload and improved economy: The workload of the simulation device is mainly the pouring and fixing of concrete slabs. Compared with the on-site construction experiment, the workload can be greatly reduced, saving working time and improving economy. (2) Increased safety: The simulation device is conducted in the laboratory, which is isolated from the actual construction site and is not affected by the traffic conditions at the construction site, thus greatly reducing the risk and having less impact from the weather environment; (3) Adjusting frequency and vibration amplitude: The concrete slab is fixed on the test bench by the first fastener and the screw nut. The tightness of the concrete slab can be adjusted, so that the vibration frequency and vibration amplitude of the concrete slab can be adjusted under the action of the vibrator. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein: Figure 1 This is a front view of the joint vibration simulation device provided by this utility model; Figure 2 express Figure 1 An enlarged view of region A shown; Figure 3 This is a right view of the joint vibration simulation device provided by this utility model; Figure 4 This diagram shows the connection structure between the vibration loading component and the first concrete slab unit. Detailed Implementation

[0018] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0019] like Figures 1-4 As shown, this embodiment provides a joint vibration simulation device, including a test bench 10, a concrete slab 20, a fixing component 30, and a vibration loading component 40.

[0020] The number of test benches 10 is two, and the two test benches 10 are spaced apart. The test benches 10 are mounted on an installation platform, and the two test benches 10 are at the same height. The installation platform can be the ground or other carrier placed on the ground.

[0021] The concrete slab 20 includes a first concrete slab unit 21, a second concrete slab unit 22 that is spaced apart from the first concrete slab unit 21 to form a splice joint 23, and connecting steel bars 24 disposed within the splice joint 23 and connecting the first concrete slab unit 21 and the second concrete slab unit 22. The concrete slab 20 is integrally cast, that is, the steel bars are first tied, and then concrete is poured at both ends to form the first concrete slab unit 21 and the second concrete slab unit 22, respectively. No concrete is poured in the middle, so that the steel bars are directly exposed to form the splice joint 23 and the connecting steel bars 24.

[0022] The first concrete slab unit 21 is used to simulate an existing bridge, the second concrete slab unit 22 is used to simulate a newly built bridge, the splice joint 23 is used to simulate the joint between the newly built bridge and the existing bridge, and the connecting steel bar 24 is used to simulate the lapped steel bars between the newly built bridge and the existing bridge.

[0023] The first concrete slab unit 21 and the second concrete slab unit 22 are flat, rectangular strip structures, consistent with the basic shape of the bridge. Preferably, the dimensions of the first concrete slab unit 21 and the second concrete slab unit 22 can be obtained by proportionally scaling the relevant dimensions of the bridge to improve the simulation's resemblance to the actual environment.

[0024] The fixing component 30 is used to fix the concrete slab 20 on the test bench 10. There are two sets of fixing components 30, which are used to fix the first concrete slab unit 21 and the second concrete slab unit 22 on the two test benches 10 respectively. After fixing, the splice joint 23 and the connecting steel bar 24 are completely suspended and are not supported by the test bench 10.

[0025] The fixing component 30 includes a first fixing member 31 and a first bolt 32.

[0026] The first fixing member 31 is disposed above the concrete slab 20 and is used to press the concrete slab 20 onto the test bench 10. The extending direction of the concrete slab 20 is a first direction, and the extending direction of the first fixing member 31 is a second direction, which is perpendicular to the first direction. The middle position of the first fixing member 31 contacts the concrete slab 20, and both ends extend towards the sides of the concrete slab 20 to facilitate the installation of the first bolt 32.

[0027] The first fastener 31 can be selected from steel materials such as I-beams, angle steel, square steel, and plate steel, which have at least one flat surface, so as to make good contact with the top surface of the concrete slab 20.

[0028] The bottom end of the first bolt 32 is anchored to the mounting platform, and the top end is connected to the first fixing member 31, which is used to fix the first fixing member 31 to the mounting platform, so that the first fixing member 31 cooperates with the test bench 10 to clamp the concrete slab 20.

[0029] Specifically, the first bolt 32 includes a matching first screw 321 and a first nut 322. The head of the first screw 321 is anchored to the mounting platform, and the rod portion passes through the first fixing member 31 and protrudes above the first fixing member 31. The first nut 322 is connected to the rod portion of the first screw 321 and abuts against the top surface of the first fixing member 31, cooperating with the test bench 10 to clamp the concrete slab 20. The first nut 322 is used to adjust the clamping degree of the first fixing member 31 and the test bench 10 on the concrete slab 20, thereby changing the vibration frequency and vibration amplitude of the concrete slab 20.

[0030] Each of the first fasteners 31 needs to be provided with the first bolts 32 at both ends. The number of sets of the first bolts 32 at each end can be selected according to actual needs, and this embodiment does not limit this.

[0031] Furthermore, a second fixing member 33 is provided at the bottom end of the first bolt 32, which is used to anchor to the mounting platform. The mounting platform has a slot 50 inside, which communicates with the outside through an opening 60. The opening 60 extends in a first direction. The second fixing member 33 is engaged in the slot 50, and the first screw 32 passes through the opening 60 and connects to the second fixing member 33.

[0032] During assembly, the second fixing member 33 is first placed along the first direction, then inserted into the slot 50 through the opening 60, and finally rotated 90 degrees so that the second fixing member 33 is placed along the second direction and engaged in the slot 50. The upper and lower parts of the second fixing member 33 abut against the mounting platform, restricting the vertical movement of the second fixing member 33 and achieving anchoring with the mounting platform. When the second fixing member 33 needs to be disengaged from the slot 50, it is rotated 90 degrees in the opposite direction and then removed from the opening 60.

[0033] The vibration loading component 40 is connected to the first concrete slab unit 21 and is used to drive the first concrete slab unit 21 to vibrate.

[0034] The vibration loading assembly 40 includes a fixing structure 41 and a vibrator 42. The fixing structure 41 is used to fix the vibrator 42 to the first concrete slab unit 21.

[0035] The fixing structure 41 includes a first fixing plate 411, a second fixing plate 412, and a second bolt 413. The first fixing plate 411 and the second fixing plate 412 are located on the upper and lower sides of the first concrete slab unit 21, respectively. The second bolt 413 connects the first fixing plate 411 and the fixing plate 412, so that the first fixing plate 411 and the second fixing plate 412 are tightly fitted to the first concrete slab unit 21.

[0036] Both the first fixing plate 411 and the second fixing plate 412 are flat steel plates, which can ensure the contact area with the first concrete slab unit 21 on the one hand, and provide a good installation surface for the installation of the vibrator 42 on the other hand, thus ensuring the installation stability of the vibrator 42.

[0037] The second screw 413 also includes a rod, a head, and a nut. The head and nut of the second screw 413 are located on the outside of the first fixing plate 411 and the second fixing plate 412, respectively. One end of the rod is connected to the head, and the other end passes through the first fixing plate 411 and the second fixing plate 412 and is suspended. The nut is connected to the suspended part of the rod. This is a conventional connection method in the art and will not be described in detail here.

[0038] The vibrator 42 is fixed to the first fixing plate 411 by bolts. When the vibrator 42 is powered on, it generates vibration, which is transmitted to the first concrete slab unit 21 through the first fixing plate 411, driving the first concrete slab unit 21 to vibrate.

[0039] Rubber pads are provided at the contact points between the concrete slab 20 and the test bench 10, the first fixing member 31, the first fixing plate 411 and the second fixing plate 412 to reduce friction and avoid damage to the concrete slab 20.

[0040] The working principle of the joint vibration simulation device provided by this utility model is as follows: Activating the vibrator 42 drives the first concrete slab unit 21 to vibrate, simulating the vibration of an existing bridge under normal traffic (vehicle and pedestrian traffic) in an actual construction scenario. Adjusting the tightness of the first bolt 32 changes the pressure of the fixing member 31 on the first concrete slab unit 21, thereby altering the vibration frequency and amplitude of the first concrete slab unit 21. The vibration frequency and amplitude of the first concrete slab unit 21 can be set according to the vibration frequency and amplitude of an existing bridge under normal traffic in an actual construction scenario. These vibration frequencies and amplitudes are acquired by specific sensors, which can be obtained using existing technologies in the field.

[0041] The embodiments of the present utility model have been described above with reference to the accompanying drawings. However, the present utility model is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present utility model without departing from its spirit, and all of these forms are within the protection scope of the present utility model.

Claims

1. A joint vibration simulation device, characterized in that, include: Test bench; A concrete slab includes a first concrete slab unit, a second concrete slab unit that forms a splice joint with the first concrete slab unit at intervals, and connecting steel bars disposed in the splice joint and connecting the first concrete slab unit and the second concrete slab unit. The first concrete slab unit is used to simulate an existing bridge, the second concrete slab unit is used to simulate a newly built bridge, the splice joint is used to simulate the joint between the newly built bridge and the existing bridge, and the connecting steel bars are used to simulate the lapped steel bars between the newly built bridge and the existing bridge. A fixing assembly is used to fix the first concrete slab unit and the second concrete slab unit onto the two test benches respectively; A vibration loading assembly is connected to the first concrete slab unit and is used to drive the first concrete slab unit to vibrate.

2. The joint vibration simulation device according to claim 1, characterized in that, The test benches are set on the installation platform, and the two test benches are spaced apart and at the same height.

3. The joint vibration simulation device according to claim 1, characterized in that, The fixing assembly includes a first fixing member and a first bolt. The first fixing member is disposed above the concrete slab and cooperates with the test bench to clamp the concrete slab. The bottom end of the first bolt is anchored to the installation platform, and the top end is connected to the first fixing member.

4. The joint vibration simulation device according to claim 3, characterized in that, The first bolt includes a matching first screw and a first nut. The head of the first screw is anchored to the mounting platform, and the shank passes through the first fixing member and protrudes above the first fixing member. The first nut is connected to the shank of the first screw and abuts against the top surface of the first fixing member, cooperating with the test bench to clamp the concrete slab. The first nut is used to adjust the clamping degree of the first fixing member and the test bench on the concrete slab, thereby changing the vibration frequency and vibration amplitude of the concrete slab.

5. The joint vibration simulation device according to claim 4, characterized in that, The contact surface between the first fastener and the concrete slab is a plane.

6. The joint vibration simulation device according to claim 4, characterized in that, The bottom end of the first bolt is provided with a second fixing member for anchoring with the installation platform. The installation platform is provided with a slot, which is formed inside the installation platform and communicates with the outside through an opening. The extension direction of the opening is a first direction. The second fixing member is disposed in the slot. The first bolt passes through the opening and is connected to the second fixing member. The second fixing member extends in the slot along a second direction. The first direction and the second direction are perpendicular.

7. The joint vibration simulation device according to claim 6, characterized in that, The concrete slab extends along a first direction, and the first fastener extends along a second direction.

8. The joint vibration simulation device according to claim 1, characterized in that, The vibration loading assembly includes a fixed structure and a vibrator. The fixed structure is fixed to the first concrete slab unit, and the vibrator is fixed to the fixed structure.

9. The joint vibration simulation device according to claim 8, characterized in that, The fixing structure includes a first fixing plate, a second fixing plate, and a second bolt. The first fixing plate and the second fixing plate are located on the upper and lower sides of the first concrete slab unit, respectively. The second bolt connects the first fixing plate and the second fixing plate. The vibrator is fixed to the first fixing plate.

10. The joint vibration simulation device according to claim 1, characterized in that, Rubber pads are provided at the contact points between the concrete slab and the test bench, the first fixing member, the first fixing plate, and the second fixing plate.

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