Bridge wet joint concrete performance test system and test method

Abstract

The invention discloses a bridge wet joint concrete performance test system and test method. The bridge wet joint concrete performance test system comprises a concrete pouring mold, a mold fixing unit and a vibration reduction and isolation unit. The concrete pouring mold comprises a plurality of splicing units, and the multiple splicing units are detachably spliced to form a groove body. The multiple first partition plates are detachably connected with the tank body, and a first pouring bin, a second pouring bin and a third pouring bin are separated; the mold fixing unit comprises a fixing plate and an end supporting frame, the fixing plate is connected with the first pouring bin, and the end supporting frame is connected with the third pouring bin; the vibration reduction and isolation unit comprises a plurality of vibration isolation devices, and the multiple vibration isolation devices are arranged between the first pouring bin and the second pouring bin and between the second pouring bin and the third pouring bin correspondingly. The dynamic response characteristics of vibration on one side and static on the other side can be accurately reproduced, high flexibility and expandability are achieved, and a rigidity dynamic adjusting mechanism can be achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bridge engineering, in particular to a bridge wet joint concrete performance test system and test method. BACKGROUND

[0002] With the increasing demand for transportation, bridge widening has become a common reconstruction and expansion scheme. However, due to the influence of vehicle-bridge coupling vibration caused by vehicle load, the new cast concrete of the joint bears the cyclic tensile-shear combined action, which seriously affects the mechanical properties of the joint, and is a research difficulty that needs to be solved in the construction of bridge widening.

[0003] Currently, the experimental study generally uses a shaking table to simulate vehicle-bridge coupling vibration. Although it can reproduce the influence of vehicle load on bridge structure in a laboratory environment, this method has significant technical limitations, mainly in the following two aspects: First, the existing experimental system uses a whole-body synchronous vibration loading method, which is difficult to accurately reproduce the complex boundary conditions of "differential vibration of new and old bridges" in actual engineering. Specifically, the existing bridge shows dynamic response under vehicle load, while the newly widened bridge is in a quasi-static state. This asymmetric vibration characteristic leads to dynamic stress concentration at the joint interface, but the existing equipment lacks independent vibration control capability for the structures on both sides of the wet joint, and cannot construct a real differential vibration coupling boundary.

[0004] Second, the existing vehicle-bridge coupling test system has functional limitations. On the one hand, due to the structural constraints of the test device, it is not possible to simultaneously conduct standard test specimens testing in the wet joint area, including the required mechanical parameter tests such as cubic compressive strength and interfacial bonding strength between new and old concrete, making it difficult to accurately characterize the quantitative influence of vibration load on the strength degradation of the wet joint. On the other hand, due to the lack of dynamic stiffness adjustment mechanism in the vibration isolation unit, it is not possible to simulate the differences in vibration transmission characteristics of new and old main girders caused by different bridge types (such as T-beams and box girders) or wet joint construction processes (different temporary supports and different anchoring methods), making it difficult for the test results to reflect the spatiotemporal non-uniformity characteristics of vibration energy transmission in actual engineering. This double functional defect seriously restricts the reliability of joint performance evaluation.

[0005] In summary, the existing vehicle-bridge coupling test has technical limitations and functional limitations. SUMMARY

[0006] The purpose of the present application is to overcome the above technical deficiencies and provide a bridge wet joint concrete performance test system and test method to solve the technical problems of technical limitations and functional limitations in the prior art.

[0007] To achieve the above technical purpose, the following technical solutions are adopted in the present application: In a first aspect, the application provides a bridge wet joint concrete performance test system, comprising a concrete pouring mold, a mold fixing unit and a vibration isolation unit.

[0008] The concrete pouring mold comprises a plurality of splicing units and a plurality of first partitions, the plurality of splicing units are detachably spliced to form a groove, and the plurality of first partitions are detachably connected with the groove to divide the groove into a first pouring bin, a second pouring bin and a third pouring bin arranged in sequence. The mold fixing unit comprises a fixing plate and an end support frame, the fixing plate is connected with the first pouring bin, and the end support frame is connected with the third pouring bin. The vibration isolation unit comprises a plurality of vibration isolation devices, and the plurality of vibration isolation devices are respectively arranged between the first pouring bin and the second pouring bin and between the second pouring bin and the third pouring bin.

[0009] In some embodiments of the application, the mold fixing unit further comprises a fixing bolt, the fixing plate comprises a flange plate, and the first pouring bin is fixedly connected with the flange plate through the fixing bolt.

[0010] In some embodiments of the application, the end support frame comprises a threaded rod and a guide sleeve, the guide sleeve is sleeved on the outside of the threaded rod, and the threaded rod is connected with the third pouring bin.

[0011] In some embodiments of the application, one side of the first pouring bin and the third pouring bin facing the second pouring bin is provided with a splicing protrusion, and both sides of the second pouring bin are provided with a splicing groove, and the splicing protrusion is embedded in the splicing groove.

[0012] In some embodiments of the application, the vibration isolation device comprises an electromagnetic coil, a permanent magnet, an iron core and a vibration isolation controller, the electromagnetic coil is sleeved on the outside of the iron core and located in the gap between the splicing protrusion and the splicing groove in the vertical direction, two poles of the permanent magnet are respectively located on the opposite sides of the iron core in the horizontal direction, and the vibration isolation controller is electrically connected with the electromagnetic coil.

[0013] In some embodiments of the application, the vibration isolation unit further comprises an upper computer, and the upper computer is signal connected with the vibration isolation controller.

[0014] In some embodiments of the application, the vibration isolation unit further comprises an elastic waterproof piece, and the elastic waterproof piece is filled in the gap between the splicing protrusion and the splicing groove in the horizontal direction.

[0015] In some embodiments of the present application, a vibration recorder and at least one vibration measuring instrument are further included, the vibration measuring instrument is installed below the second pouring bin and is connected with the vibration recorder.

[0016] In some embodiments of the present application, a plurality of second partitions are further included, the plurality of second partitions are respectively detachably connected with the groove body to separate the second pouring bin into a plurality of sequentially arranged sub-pouring bins, and one vibration measuring instrument is installed below each sub-pouring bin.

[0017] In a second aspect, the present application further provides a bridge wet joint concrete performance test method, which adopts the bridge wet joint concrete performance test system according to any one of the embodiments of the first aspect, and includes the following steps: The groove body of a preset size is formed by installing and detaching the splicing unit; The standard test block test and the interface bonding test are switched by installing and detaching the first partition; The new-old bridge differential vibration boundary is simulated by the vibration reduction and isolation unit; The vibration parameters and the concrete strength are synchronously measured, and a vibration-performance correlation model is established.

[0018] Compared with the prior art, the technical scheme provided by the present application has the beneficial technical effects including: The first pouring bin and the third pouring bin are connected with the mold fixing unit respectively, which can accurately reproduce the dynamic response characteristics of the wet joint on one side under the action of vehicle-bridge coupled vibration and the static state on the other side in the bridge widening engineering, thereby ensuring that the experimental results are highly consistent with the actual engineering conditions, and the real representativeness and application value of the experimental data are enhanced. Through the modular splicing unit, high flexibility and scalability are achieved, which can adapt to the test requirements of different types and sizes of bridge joints, realize standard test block test, meet the requirements of various experimental scenes, and realize quantitative description of the influence of the wet joint newly poured concrete under vibration. Through the vibration reduction and isolation unit, the stiffness dynamic adjustment mechanism can be realized, the vibration transmission characteristic difference caused by different bridge widening forms and different wet joint treatment methods can be simulated, and the mechanical behavior and durability of the joint under different traffic loads can be comprehensively analyzed. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows: Figure 1 is a structural schematic diagram of a bridge wet joint concrete performance test system in an embodiment of the present application; Figure 2 is Figure 1 is an enlarged schematic diagram of a vibration isolation device in

[0020] Reference signs: Concrete pouring mold 1, first partition plate 11, first pouring bin 1a, second pouring bin 1b, third pouring bin 1c, second partition plate 12; Fixed plate 2, end support frame 3, vibration isolation device 4, electromagnetic coil 41, permanent magnet 42, iron core 43, vibration isolation controller 44, fixed bolt 5, elastic waterproof piece 6, vibration recorder 7, vibration measuring instrument 8. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0022] Those skilled in the art can understand that, in the present specification, the expression "comprising" is an open-ended expression, which means that the feature exists but other features are not excluded. The terms "upper", "lower", "left", "right" and the like are the example directions based on the drawings. The features with "first" and "second" are implicitly included one or more of the features. Singular form expressions can also be used for plural forms. The meaning of "a plurality of" is two or more. The terms "mounting", "connecting", "connecting" can be fixed connection, or detachable connection, or integral connection; can be directly connected, or indirectly connected through intermediate medium, or the communication between two elements. In addition, "connection" can include wireless connection.

[0023] The purpose of the present application is to overcome the above technical deficiencies, and to provide a bridge wet joint concrete performance test system and test method, which solves the technical problems of technical limitations and functional limitations in the prior art.

[0024] In order to achieve the above technical purpose, the present application adopts the following technical scheme: As shown in Figure 1 and Figure 2 The first aspect, the present application provides a bridge wet joint concrete performance test system, comprising a concrete pouring mold 1, a mold fixing unit and a vibration isolation unit.

[0025] The concrete pouring mold 1 comprises a plurality of splicing units and a plurality of first partitions 11, the plurality of splicing units are detachably spliced with each other to form a groove body; the plurality of first partitions 11 are respectively detachably connected with the groove body to separate the groove body into at least a first pouring bin 1a, a second pouring bin 1b and a third pouring bin 1c arranged in sequence; the three pouring bins simulate different areas of a wet joint when a bridge is widened. The first pouring bin 1a represents an existing old bridge part, the third pouring bin 1c represents a new bridge part on the other side, and the second pouring bin 1b is a wet joint area between the two. Corresponding concretes are poured on the simulated static side and the vibrating side, and new concrete is poured in the wet joint area in the middle. The modular design of the mold makes it convenient to adjust the size and relative position of each bin to adapt to different test conditions. After the concrete reaches a certain strength, a vibration test is carried out, data is collected, and the mechanical behavior and durability performance of the new concrete in the wet joint area under coupled vibration are analyzed.

[0026] The mold fixing unit comprises a fixing plate 2 and an end support frame 3, the fixing plate 2 is connected with the first pouring bin 1a, and the end support frame 3 is connected with the third pouring bin 1c; the first and third pouring bins 1c are respectively fixed on different support structures (the fixing plate 2 and the end support frame 3). In actual tests, a vibration excitation device (such as a vibration exciter) will be installed in a specific pouring bin (such as a part of the bridge deck simulating the action of vehicle load). Vibration of a specific frequency and amplitude is applied to simulate the vibration of the bridge deck caused by the vehicle load. When vibration is applied to one or more pouring bins, due to the difference in fixing methods, the state of "one side vibrating and the other side relatively static" can be simulated. For example, the third pouring bin 1c can be fixed, and only the first pouring bin 1a is vibrated, or vice versa. Sensors (such as accelerometers and strain gauges) are arranged in each pouring bin (especially in the wet joint area) to monitor and record vibration response data in real time.

[0027] The vibration isolation unit comprises a plurality of vibration isolation devices 4, and the plurality of vibration isolation devices 4 are respectively arranged between the first pouring bin 1a and the second pouring bin 1b and between the second pouring bin 1b and the third pouring bin 1c. On the one hand, when vibration is applied to the vibrating side (such as the first pouring bin 1a), the vibration can be transmitted to the wet joint area (the second pouring bin 1b) and then to the static side (such as the third pouring bin 1c); on the other hand, the transmission of vibration from the vibrating side to the static side can be controlled or isolated by adjusting the stiffness or damping characteristics of the vibration isolation devices 4. The complex situation of vibration transmission and attenuation in the structure due to the connection of new and old structures, the difference in stiffness, the difference in support conditions and other reasons in the actual bridge can be accurately simulated.

[0028] The mold fixing unit is connected with the first pouring bin 1a and the third pouring bin 1c respectively, can accurately reproduce the dynamic response characteristics of the wet joint side vibration and the other side static under the action of vehicle-bridge coupling vibration in the bridge widening project, thereby ensuring that the experimental results are highly consistent with the actual engineering conditions, and the real representativeness and application value of the experimental data are enhanced. Through the modular splicing unit, the flexibility and scalability are high, the test requirements of different types and sizes of bridge joints can be met, standard test specimens can be tested, the needs of various experimental scenes can be met, and the influence of the vibrating wet joint newly poured concrete can be quantitatively described. Through the vibration reduction and isolation unit, the stiffness dynamic adjustment mechanism can be realized, the difference in vibration transmission characteristics caused by different bridge form widening and different wet joint treatment methods can be simulated, and the mechanical behavior and durability of the joint under different traffic loads can be comprehensively analyzed.

[0029] In some embodiments of the application, the mold fixing unit further comprises a fixing bolt 5, and the fixing plate 2 comprises a flange plate, and the first pouring bin 1a is fixedly connected with the flange plate through the fixing bolt 5.

[0030] An external vibration source, such as a separate vibration table or exciter, acts on the fixed plate 2 and the flange plate structure, and transmits to the first pouring bin 1a through the fixing bolt 5, thereby simulating the vibration state of the old bridge under traffic load. The fastening degree of the bolt will affect the connection stiffness and damping between the first pouring bin 1a and the fixed plate 2, and then affect the efficiency and characteristics of vibration transmission. In this way, the first pouring bin 1a vibrates relative to the second and third pouring bins 1c.

[0031] This connection mode can more accurately simulate the vibration state of the old bridge structure in reality. The flange plate provides a larger contact area, which helps to disperse the stress of the bolt and improve the stability of the connection. By adjusting the fastening torque of the fixing bolt 5, the connection stiffness between the first pouring bin 1a and the fixed plate 2 can be adjusted within a certain range.

[0032] In some embodiments of the application, the end support frame 3 comprises a threaded rod and a guide sleeve, and the guide sleeve is sleeved on the outside of the threaded rod, and the threaded rod is connected with the third pouring bin 1c.

[0033] When the guide sleeve is fixed, the threaded rod can move up and down inside the guide sleeve by rotating the threaded rod. The guide sleeve not only provides thread engagement, but also plays a guiding role, ensuring that the threaded rod moves smoothly and linearly up and down when rotating, preventing it from shaking or deviating, and ensuring the stability and precision of the support.

[0034] The threaded rod is connected to the third pouring bin 1c, and the up and down movement of the threaded rod directly changes the height of the third pouring bin 1c relative to the supporting foundation. There may be a height difference between the new and old beam bodies, or it may be necessary to simulate a specific construction or stress state. The adjustable height allows the mold to adapt to these different initial conditions or simulation requirements without the need to replace the entire support structure.

[0035] In some embodiments of the present application, one side of the first pouring bin 1a and the third pouring bin 1c towards the second pouring bin 1b has a splicing protrusion, and the other side of the second pouring bin 1b has a splicing groove, and the splicing protrusion is embedded in the splicing groove.

[0036] By adjusting the position, the splicing protrusion on the first and third pouring bins 1c can be accurately embedded into the splicing grooves on both sides of the second pouring bin 1b. This embedding process plays a role in positioning and preliminary fixing.

[0037] It can better maintain the overall stability of the mold during the concrete pouring and testing process, and reduce deformation. It can effectively prevent concrete from leaking from the splicing joint during pouring, ensuring the pouring quality of the wet joint concrete.

[0038] In another alternative, the positions of the splicing protrusion and the splicing groove are interchanged, i.e., the first pouring bin 1a and the third pouring bin 1c have splicing grooves, and the second pouring bin 1b has a splicing protrusion. When assembling the mold, the splicing protrusion of the second pouring bin 1b is aligned and embedded into the splicing grooves of the first pouring bin 1a and the third pouring bin 1c. This way also achieves the connection and positioning of the three pouring bins in the width direction.

[0039] In some embodiments of the present application, the vibration isolation device 4 includes an electromagnetic coil 41, a permanent magnet 42, a core 43, and a vibration isolation controller 44. The electromagnetic coil 41 is sleeved outside the core 43 and located in the gap between the splicing protrusion and the splicing groove in the vertical direction. The two poles of the permanent magnet 42 are located on the opposite sides of the core 43 in the horizontal direction, and the vibration isolation controller 44 is electrically connected to the electromagnetic coil 41.

[0040] The electromagnetic coil 41 generates a magnetic field after being energized. The core 43 provides a magnetic flux loop, enhances the magnetic field effect, and serves as a support structure for the coil. The permanent magnet 42 provides a constant magnetic field. Its two poles are located on the opposite sides of the core 43 in the horizontal direction, and the generated magnetic field is horizontal, interacting with the magnetic circuit formed by the core 43. The vibration isolation controller 44 is responsible for monitoring vibrations and controlling the current of the electromagnetic coil 41. This vibration isolation device 4 directly acts on the contact interface connecting two pouring bins (through the protrusion and the groove), and mainly controls the vertical vibration.

[0041] The permanent magnet 42 generates a constant magnetic field, which interacts with the iron core 43 to form an initial magnetic field environment in the gap. When the electromagnetic coil 41 is not powered, there is an initial repulsive force or elastic force generated by the permanent magnet 42, which presses the protrusion towards the groove or keeps a certain distance from the groove. When the vibration of the vehicle bridge is transmitted to the mold, it will cause the vibration of the first pouring chamber 1a relative to the second pouring chamber 1b, and this vibration will try to be transmitted through the contact surface of the protrusion and the groove. The vibration controller 44 needs to monitor the vibration signal in real time, and according to the monitored vibration signal, the size and direction of the electromagnetic force required to be applied are calculated to offset or weaken the vibration transmission. The controller outputs the corresponding current to the electromagnetic coil 41. The current generates a changing magnetic field, which interacts with the constant magnetic field of the permanent magnet 42 and the relative magnetic field change generated by the possible vibration displacement. The magnetic field generated by the electromagnetic coil 41 interacts with the magnetic field of the permanent magnet 42 to generate a dynamic force in the vertical gap. The size and direction of this dynamic force can be accurately adjusted. This dynamic force is used to actively "oppose" or "absorb" the vertical vibration energy that tries to be transmitted through the protrusion and the groove. Effectively reduces the degree of vibration transmission from one side pouring chamber to the other side pouring chamber.

[0042] In some embodiments of the present application, the vibration isolation and reduction unit further comprises a host computer, which is in signal connection with the vibration isolation controller 44.

[0043] The host computer can receive data from the sensor and the state of the vibration isolation controller 44 itself. The host computer sends the calculated and optimized control instructions to the vibration isolation controller 44. The vibration isolation controller 44 receives the instructions from the host computer and generates specific drive signals to control the electromagnetic coil 41 to generate corresponding electromagnetic force, thereby achieving the vibration isolation effect.

[0044] In some embodiments of the present application, the vibration isolation and reduction unit further comprises an elastic waterproof element 6, which is filled in the gap between the splicing protrusion and the splicing groove in the horizontal direction.

[0045] The elastic waterproof element 6 can be a rubber waterstop. It effectively prevents concrete slurry leakage, avoids defects such as honeycomb and pitted surface caused by slurry leakage, thereby ensuring the structural integrity and mechanical properties of the test piece. It prevents concrete slurry from seeping into the splicing gap, facilitates the disassembly and cleaning of the mold, and prolongs the service life of the mold. The elastic element can absorb part of the impact and vibration, which helps to stabilize the whole mold and reduce noise, and assists the active vibration isolation and reduction unit.

[0046] In some embodiments of the present application, a vibration recorder 7 and at least one vibration measuring instrument 8 are further included, and the vibration measuring instrument 8 is installed below the second pouring chamber 1b and in signal connection with the vibration recorder 7.

[0047] The vibration measuring instrument 8 includes an acceleration sensor, a speed sensor, or a displacement sensor. Vibration is transmitted to the bottom of the second pouring bin 1b through the concrete. The vibration under the second pouring bin 1b includes the vibration from the new and old main beams (the first and third pouring bins 1c) and the vibration information of the wet joint itself deformation and transmission. The vibration measuring instrument 8 detects these mechanical vibrations (changes in acceleration, speed, or displacement) and converts them into corresponding electrical signals (voltage or current signals). These electrical signals are transmitted to the vibration recorder 7 through wires.

[0048] The vibration response of the wet joint area (under the second pouring bin 1b) under the action of vehicle load can be accurately measured and recorded. By analyzing the recorded vibration data, the stiffness, damping characteristics, and vibration transmission efficiency of the wet joint under different load conditions can be evaluated. Comparing the vibration data measured in the test with the theoretical calculation or finite element simulation results can verify the effectiveness of the test system in simulating the mechanical behavior of the wet joint under vehicle-bridge coupled vibration. By comparing the differences in vibration response under different wet joint treatment methods or different widening forms, data support can be provided for optimizing the design parameters (such as reinforcement arrangement, concrete mix ratio, prestress, etc.) and construction process of the wet joint.

[0049] In some embodiments of the present application, a plurality of second partitions 12 are further included, which are respectively detachably connected with the groove body to divide the second pouring bin 1b into a plurality of sub-pouring bins arranged in sequence, and each sub-pouring bin is provided with a vibration measuring instrument 8 below.

[0050] The second partition 12 is connected with the external groove body (the main body of the second pouring bin 1b) through bolts, buckles, plug-in connections, etc. The originally single second pouring bin 1b is divided into a plurality of independent small areas, i.e., a plurality of sub-pouring bins, in the horizontal direction. The number of vibration sensors is equal to the number of sub-pouring bins.

[0051] When an external load (such as a simulated vehicle) acts on the mold, vibration is transmitted to the entire structure, including each sub-pouring bin. The vibration measuring instrument 8 installed below each sub-pouring bin independently detects and converts the vibration signal below the area.

[0052] Each sub-pouring bin is provided with a vibration measuring instrument 8 below, realizing distributed and multi-point measurement of the vibration response of the wet joint area. In actual stress, the stress state and vibration response at different positions of the bridge wet joint are often uneven. This design enables the mold to better simulate this non-uniformity, and the research results are closer to the actual situation.

[0053] In a second aspect, the present application further provides a bridge wet joint concrete performance test method, which adopts the bridge wet joint concrete performance test system according to any one of the embodiments of the first aspect, and includes the following steps: The groove body of the preset size is formed by mounting and dismounting the splicing units; The standard test block test and the interface bonding test are switched by mounting and dismounting the first partition plate 11; The new and old bridge difference vibration boundary is simulated by the vibration isolation and reduction unit; The vibration parameters and the concrete strength are synchronously measured, and the vibration-performance correlation model is established.

[0054] The implementation method of the multi-functional mold for the field test of the wet joint cast-in-place concrete under the vehicle bridge coupling vibration environment is as follows: the first pouring bin 1a is anchored on the bridge flange plate through the fixing bolt 5, and the concrete forming test block is placed in the first pouring bin 1a to simulate the old bridge.

[0055] The second pouring bin 1b is connected with the first pouring bin 1a through the electromagnetic vibration isolation device 4, the electromagnetic vibration isolation device 4 can adjust the vibration isolation stiffness through the vibration isolation control instrument, and is used for simulating the different vibration transmission stiffnesses under different wet joint structure measures. Meanwhile, the second pouring bin 1b pours the freshly mixed concrete.

[0056] The second pouring bin 1b and the third pouring bin 1c are connected through the electromagnetic vibration isolation device 4, and the concrete forming test block is placed in the third pouring bin 1c, and the end support frame 3 is arranged below the third pouring bin 1c and is used for supporting the third pouring bin 1c to form a stable and non-vibration structure. The electromagnetic vibration isolation device 4 adjusts the stiffness by controlling the number of turns of the coil and the size of the current, so as to realize different vibration isolation effects.

[0057] The first pouring bin 1a, the second pouring bin 1b and the third pouring bin 1c are separated by the rubber waterstop, which can realize vibration isolation and prevent the loss of newly poured concrete.

[0058] The first detachable partition plate 11 is used for realizing different tests required. When the first detachable partition plate 11 is mounted, each sub-pouring bin in the second pouring bin 1b is a single forming test block, and the test block in the second pouring bin 1b can be measured for the standard experimental parameters such as the compressive strength. When the first detachable partition plate 11 is dismounted, the second pouring bin 1b is communicated with the first pouring bin 1a and the third pouring bin 1c, the aforementioned freshly mixed concrete and the concrete forming test block can form a new and old concrete bonding surface, and the strength test of the new and old concrete bonding surface is realized.

[0059] The vibration measuring instrument 8 is arranged below each sub-pouring bin, and the vibration measuring instrument 8 is connected with the vibration measuring data recorder. The vibration measurement includes the measurement of key vibration parameters such as vibration acceleration and amplitude.

[0060] The linear relationship between the vibration and the strength of the concrete can be obtained by analyzing the strength of each test block in the second pouring bin 1b obtained by the foregoing and the corresponding position vibration parameter, so as to guide the construction of the wet joint concrete.

[0061] Compared with the prior art, the technical scheme provided by the application has the beneficial technical effects including: The mold fixing unit is connected with the first pouring bin 1a and the third pouring bin 1c respectively, which can accurately reproduce the dynamic response characteristics of the wet joint side vibration and the other side static under the action of vehicle-bridge coupling vibration in the bridge widening engineering, thereby ensuring that the experimental results are highly consistent with the actual engineering conditions, and the real representativeness and application value of the experimental data are enhanced. Through the modular splicing unit, it has high flexibility and scalability, can adapt to the test requirements of different types and sizes of bridge joints, and realize standard test specimens, meet the needs of various experimental scenes, and can realize quantitative description of the influence of the vibrating wet joint newly poured concrete. Through the vibration reduction and isolation unit, the stiffness dynamic adjustment mechanism can be realized, which can simulate the differences in vibration transmission characteristics caused by different bridge form widening and different wet joint treatment methods, so as to comprehensively analyze the mechanical behavior and durability of the joint under different traffic loads.

[0062] Those skilled in the art can understand that the steps, measures and schemes in the various operations, methods and processes discussed in the application can be alternated, changed, rearranged, decomposed, combined or deleted.

[0063] The specific embodiments of the application described above do not constitute a limitation on the scope of protection of the application. Any various other corresponding changes and modifications made according to the technical concept of the application should be included in the scope of protection of the claims of the application.

Claims

1. A bridge wet joint concrete performance test system, characterized in that: include: A concrete casting mold, the concrete casting mold comprising a plurality of splicing units and a plurality of first partitions, the plurality of splicing units being detachably spliced ​​to form a trough body, the plurality of first partitions being detachably connected to the trough body to separate the trough body into at least a first casting bin, a second casting bin, and a third casting bin arranged in sequence; A mold fixing unit, comprising a fixing plate and an end support frame, wherein the fixing plate is connected to the first casting bin, and the end support frame is connected to the third casting bin; The vibration reduction and isolation unit includes a plurality of vibration isolation devices, and the plurality of vibration isolation devices are respectively arranged between the first casting bin and the second casting bin and between the second casting bin and the third casting bin.

2. The bridge wet joint concrete performance test system according to claim 1 is characterized in that: The mold fixing unit further includes fixing bolts, the fixing plate includes a flange plate, and the first casting bin is fixedly connected to the flange plate via the fixing bolts.

3. The bridge wet joint concrete performance test system according to claim 1 is characterized in that: The end support frame includes a threaded rod and a guide sleeve. The guide sleeve is sleeved on the outside of the threaded rod, and the threaded rod is connected to the third casting bin.

4. The bridge wet joint concrete performance test system according to claim 1 is characterized in that: The first casting bin and the third casting bin each have a splicing protrusion on one side facing the second casting bin, and the second casting bin has a splicing groove on both sides, and the splicing protrusion is embedded in the splicing groove.

5. The bridge wet joint concrete performance test system according to claim 4 is characterized in that: The vibration isolation device includes an electromagnetic coil, a permanent magnet, an iron core and a vibration isolation controller. The electromagnetic coil is sleeved on the outside of the iron core and is located in the gap between the splicing protrusion and the splicing groove in the vertical direction. The two poles of the permanent magnet are respectively located on the opposite sides of the iron core in the horizontal direction. The vibration isolation controller is electrically connected to the electromagnetic coil.

6. The bridge wet joint concrete performance test system according to claim 5 is characterized in that: The vibration reduction and isolation unit further includes a host computer, which is connected to the vibration isolation controller by signal.

7. The bridge wet joint concrete performance test system according to claim 5 is characterized in that: The vibration reduction and isolation unit further includes an elastic waterproof member, which is filled in the gap between the splicing protrusion and the splicing groove in the horizontal direction.

8. The bridge wet joint concrete performance test system according to claim 1 is characterized in that: It also includes a vibration recorder and at least one vibration measuring instrument, wherein the vibration measuring instrument is installed below the second casting bin and is connected to the vibration recorder signal.

9. The bridge wet joint concrete performance test system according to claim 8, characterized in that: It also includes multiple second partitions, which are detachably connected to the trough body to separate the second casting bin into multiple sub-casting bins arranged in sequence, and a vibration measuring instrument is installed under each sub-casting bin.

10. A bridge wet joint concrete performance test method, characterized in that: The bridge wet joint concrete performance test system according to any one of claims 1 to 9 is used, comprising the following steps: A trough of preset size is formed by installing and disassembling splicing units; Switch between standard test block test and interface bonding test by installing and removing the first partition; The differential vibration boundary between the new and old bridges is simulated by using vibration isolation units; Vibration parameters and concrete strength are measured simultaneously to establish a vibration-performance correlation model.

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