Device and method for testing vibration resistance of tunnel fireproof coating

Abstract

The invention discloses a tunnel fireproof coating anti-vibration performance test device and method, the tunnel fireproof coating anti-vibration performance test device comprises a vibration device, a test module and a control system, the test module is detachably and fixedly arranged on the vibration device, and a data acquisition end of the control system is connected with the vibration device. According to the technical scheme, by simulating real working conditions, comprehensively evaluating the performance, accurately controlling the test process and efficiently processing data, a scientific basis is provided for performance optimization and application of the tunnel fireproof coating, and remarkable technical effects and social and economic benefits are achieved.

Description

Technical Field

[0001] The present invention relates to a fire test device, and in particular to a test device and method for the anti-vibration performance of tunnel fireproof coatings. Background Art

[0002] As an important transportation facility, the safety performance of a tunnel is directly related to the safety of people's lives and property. Tunnel fireproof coatings, as a key protective material, can effectively improve the fireproof performance of tunnel structures. However, during the operation of a tunnel, it is affected by vibrations caused by natural factors such as piston winds, and these vibrations may affect the performance and service life of tunnel fireproof coatings.

[0003] Tunnel fireproof coatings can not only improve the fireproof performance of tunnel structures, but also resist various environmental factors that may be encountered during tunnel operation to a certain extent, such as piston winds. Tunnel piston wind is a high-speed air flow generated when a train passes through a tunnel, and this air flow may cause vibrations to the tunnel structure and internal facilities, affecting the performance and service life of tunnel fireproof coatings. Therefore, studying the anti-wind vibration performance of tunnel fireproof coatings has important theoretical and practical significance for improving the fire safety performance of tunnel structures. Summary of the Invention

[0004] The purpose of the present invention is to provide a test device and method for the anti-vibration performance of tunnel fireproof coatings.

[0005] To achieve the above purpose, the present invention is implemented according to the following technical solutions:

[0006] The test device for the anti-vibration performance of tunnel fireproof coatings of the present invention includes a vibration device, a test module, and a control system. The test module is detachably and fixedly arranged on the vibration device, and the control system is connected to the vibration device.

[0007] Further, the vibration device includes a vibration test bench, a mounting bracket, and a fastening device. The lower end of the mounting bracket is fixedly arranged on the vibration test bench. The mounting bracket is of a frame structure. The fastening device is arranged on the lower end face of the top of the mounting bracket, and the fastening device is detachably and fixedly connected to the test module. The upper end of the top of the mounting bracket is connected to the control system.

[0008] The test module includes an adhesion strength test module, a compressive strength test module, and a flexural strength test module. The adhesion strength test module, the compressive strength test module, and the flexural strength test module are all detachably connected to the fastening device.

[0009] The bond strength test module includes a specimen bottom plate, a fireproof coating, a steel upper fixture for tensile testing, and a counterweight. The fireproof coating is applied to the lower end face of the specimen bottom plate. The upper end of the steel upper fixture for tensile testing is adhesively connected to the lower end face of the fireproof coating. The counterweight is detachably and fixedly arranged at the lower end of the steel upper fixture for tensile testing. The specimen bottom plate is detachably and fixedly connected to the fastening device. The compressive strength test module is a cube structure, and the fireproof coating is applied to the surface of the cube-shaped compressive strength test module. The flexural strength test module is a plate-like structure, and the fireproof coating is applied to the surface of the plate-like flexural strength test module.

[0010] The control system includes a sensor and a console. The sensor is arranged at the upper end of the top of the mounting bracket, and the signal output end of the sensor is connected to the signal input end of the console.

[0011] The test method of the tunnel fireproof coating anti-vibration performance test device described in the present invention includes the following steps:

[0012] 1. Fix the sensor at the middle position of the top of the mounting bracket to collect and feedback vibration signals;

[0013] 2. Fix one or more of the bond strength test module, the compressive strength test module, and the flexural strength test module to the lower end face of the top of the mounting bracket respectively through a fastening device;

[0014] 3. Turn on the vibration test bench. The vibration test bench drives the test module to vibrate through the mounting bracket. The sensor feeds back signals to the console in real time, and the console adjusts the vibration frequency, vibration amplitude, vibration direction, and vibration time in real time according to the feedback signals to ensure that the vibration meets the test requirements;

[0015] 4. After the simulated vibration is over, remove the bond strength test module, the compressive strength test module, or the flexural strength test module; respectively detect the bond strength test module, the compressive strength test module, or the flexural strength test module through a bond strength tester, a compressive strength tester, and a flexural strength tester to obtain test data.

[0016] The calculation of the bond strength test is as follows:

[0017] f b = F / A

[0018] In the formula: f b ——Bond strength; F——Maximum tensile load; A——Bonding area.

[0019] The calculation of the compressive strength test is as follows:

[0020] R = P / A

[0021] Where: R——Compressive strength; P——Maximum load; A——Compressed area.

[0022] The calculation of the flexural strength test is as follows:

[0023]

[0024] Where: T——Flexural strength; p——Failure load; L——Support distance; b——Width of the specimen cross-section; e——Thickness of the specimen cross-section.

[0025] The beneficial effects of the present invention are:

[0026] The present invention is a test device and method for the anti-vibration performance of tunnel fireproof coatings. Compared with the prior art, the technical effects of the present invention are mainly reflected in the following aspects:

[0027] 1. Simulating real working conditions: Through the calculation of piston wind pressure and the determination of vibration frequency, this test device can accurately simulate the vibration characteristics (such as wind speed, wind pressure, vibration frequency, etc.) generated when trains and cars pass through the tunnel. This highly simulated test environment ensures the reliability and representativeness of the test results and can truly reflect the performance of the fireproof coating in actual use.

[0028] 2. Comprehensive performance evaluation: This test device and method can simultaneously test various performance indicators of the fireproof coating, including bond strength, compressive strength, and flexural strength. This multi-dimensional performance evaluation method provides strong support for comprehensively understanding the comprehensive performance of the fireproof coating in a vibration environment and helps to optimize the coating formula and construction process.

[0029] 3. Precise control and feedback: The test device is equipped with advanced sensors and a console, which can monitor vibration signals in real time and automatically adjust parameters such as vibration frequency and amplitude according to the feedback. This precise control mechanism ensures the stability and repeatability of the test process and reduces the interference of human factors and environmental factors on the test results.

[0030] 4. Efficient data processing: The test results are processed using scientific statistical methods, such as excluding abnormal data beyond ±15% of the average value, to ensure the accuracy and reliability of the final results. This efficient data processing method can quickly draw conclusions and provide a strong basis for the research and application of fireproof coatings.

[0031] 5. Extending the service life of the fireproof coating: By simulating the actual vibration environment, this technical solution can effectively identify the weak links of the fireproof coating under vibration conditions. This helps to improve the coating formula and construction process, thereby increasing its service life in the tunnel, reducing maintenance costs, and enhancing the safety and economy of the tunnel.

[0032] 6. Promote the formulation of industry standards: This test device and method provide a standardized testing means for the performance evaluation of tunnel fireproof coatings, and can provide a scientific basis for the formulation of industry standards. This standardized testing method helps to regulate the market, improve product quality, and promote the technological progress of the entire tunnel fireproof coating industry.

[0033] 7. Enhance the fire safety of tunnels: By verifying and optimizing the anti-vibration performance of fireproof coatings, this technical solution can significantly improve the fire safety of tunnels in complex environments such as piston winds. This has important practical significance for ensuring the safety of people's lives and property and reducing the losses caused by fire accidents.

[0034] In summary, the technical solution of the present invention provides a scientific basis for the performance optimization and application of tunnel fireproof coatings by simulating real working conditions, comprehensively evaluating performance, precisely controlling the test process, and efficiently processing data, and has significant technical effects and social and economic benefits. Brief Description of the Drawings

[0035] Figure 1 is a schematic structural diagram of the device of the present invention;

[0036] Figure 2 is a schematic structural diagram of the specimen of the present invention;

[0037] Figure 3 is a schematic diagram of the piston wind pressure calculation principle of the present invention.

[0038] In the figure: vibration test bench 1, mounting bracket 2, fastening device 3, specimen bottom plate 4, fireproof coating 5, steel upper fixture for tensile test 6, counterweight 7, sensor 8, control console 9 Detailed Embodiments

[0039] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. The schematic embodiments and descriptions of the present invention are used to explain the present invention, but do not limit the present invention.

[0040] As Figure 1-2 shown: The anti-vibration performance test device for tunnel fireproof coatings of the present invention includes a vibration device, a test module, and a control system. The test module is detachably and fixedly arranged on the vibration device, and the control system is connected to the vibration device.

[0041] Further, the vibration device includes a vibration test bench 1, a mounting bracket 2, and a fastening device 3. The lower end of the mounting bracket 2 is fixedly arranged on the vibration test bench 1. The mounting bracket 2 is of a frame structure. The fastening device 3 is arranged on the lower end face of the top of the mounting bracket 2. The fastening device 3 is detachably and fixedly connected to the test module. The upper end of the top of the mounting bracket 2 is connected to the control system.

[0042] The test module includes an adhesive strength test module, a compressive strength test module, and a flexural strength test module. The adhesive strength test module, the compressive strength test module, and the flexural strength test module are all detachably connected to the fastening device 3.

[0043] The adhesive strength test module includes a specimen bottom plate 4, a fireproof coating 5, a steel upper fixture 6 for tensile testing, and a counterweight 7. The fireproof coating 5 is coated on the lower end surface of the specimen bottom plate 4. The upper end of the steel upper fixture 6 for tensile testing is adhesively connected to the lower end surface of the fireproof coating 5. The counterweight 7 is detachably and fixedly arranged at the lower end of the steel upper fixture 6 for tensile testing. The specimen bottom plate 4 is detachably and fixedly connected to the fastening device 3. The compressive strength test module has a cube structure, and the fireproof coating 5 is coated on the surface of the cube-shaped compressive strength test module. The flexural strength test module has a plate-like structure, and the fireproof coating 5 is coated on the surface of the plate-like flexural strength test module.

[0044] The control system includes a sensor 8 and a console 9. The sensor 8 is arranged at the upper end of the top of the mounting bracket 2, and the signal output end of the sensor 8 is connected to the signal input end of the console 9.

[0045] The test method of the test device for the anti-vibration performance of the tunnel fireproof coating according to the present invention includes the following steps:

[0046] 1. Fix the sensor 8 at the middle position of the top of the mounting bracket 2 to collect and feedback vibration signals.

[0047] 2. Fix one or more of the adhesive strength test module, the compressive strength test module, and the flexural strength test module on the lower end surface of the top of the mounting bracket 2 respectively through a fastening device 3.

[0048] 3. Start the vibration test bench 1. The vibration test bench 1 drives the test module to vibrate through the mounting bracket 2. The sensor 8 feeds back signals to the console 9 in real time. The console 9 adjusts the vibration frequency, vibration amplitude, vibration direction, and vibration time in real time according to the feedback signals to ensure that the vibration meets the test requirements.

[0049] 4. After the simulated vibration ends, remove the adhesive strength test module, the compressive strength test module, or the flexural strength test module. Detect the adhesive strength test module, the compressive strength test module, or the flexural strength test module respectively through an adhesive strength tester, a compressive strength tester, and a flexural strength tester to obtain test data.

[0050] Piston wind pressure calculation:

[0051] As Figure 3As shown, the piston effect (P0) refers to an airflow phenomenon formed when a vehicle travels in an enclosed space such as a tunnel, pushing the surrounding air. This airflow advances as the vehicle moves forward, similar to the movement of a piston in a cylinder, hence the name piston wind.

[0052] A,v1 = A2v2

[0053]

[0054] The cross-sectional area A of the tunnel t , the tunnel length l t , the speed v0 of the passing vehicle and the vehicle length l0, etc. are the main factors affecting the piston wind pressure. The vehicle, the roughness height of the tunnel surface, the friction coefficient λ of the tunnel wall, the drag coefficient C of the vehicle head DN , the characteristic dimension α, etc. are the secondary factors affecting the piston wind pressure. The density of vehicles (i.e., traffic flow) is also an important factor affecting the piston wind. Through calculation, the maximum piston wind speed in a train tunnel can exceed 30 m / s; the maximum piston wind pressure can exceed 5 Kpa; the piston wind speed in a highway tunnel is (0 - 10) m / s; the piston wind pressure generally does not exceed 1 Kpa.

[0055] Vibration frequency determination:

[0056] Calculations and relevant research show that the main frequency bands of vibrations caused by trains are in the range of (40 - 100) Hz, and the peaks generally appear in the range of (40 - 80) Hz. The main frequency bands of vibrations caused by cars are in the frequency band range of (10 - 20) Hz, and the peaks generally appear in the range of (12 - 17) Hz.

[0057] Principle of piston wind excitation:

[0058] The vibration test is based on the principle of dynamics to ensure that it can generate vibrations conforming to the characteristics of actual tunnel piston wind. The movement of the vibration table can be represented by the following second-order differential equation:

[0059]

[0060] where m is the mass of the vibration table, c is the damping coefficient, k is the elastic coefficient, y is the displacement of the vibration table, and F(wind) is the wind excitation force.

[0061] The calculation of the bonding strength test is as follows:

[0062] f b = F / A

[0063] In the formula: f b——Bond strength, unit: megapascal (MPa); F——Maximum tensile load, unit: newton (N); A——Bonding area, unit: square millimeter (mm 2 ).

[0064] The calculation of the compressive strength test is as follows:

[0065] R = P / A2

[0066] In the formula: R——Compressive strength, unit: megapascal (MPa); P——Maximum load, unit: newton (N); A2——Compression area, unit: square millimeter (mm 2 ).

[0067] The calculation of the flexural strength test is as follows:

[0068]

[0069] In the formula: T——Flexural strength, unit: megapascal (MPa); p——Failure load, unit: newton (N); L——Support distance, unit: millimeter (mm); b——Specimen cross-section width, unit: millimeter (mm); e——Specimen cross-section thickness, unit: millimeter (mm).

[0070] If one of the 5 test values exceeds the average value by ±15%, it should be excluded and the arithmetic mean of the remaining 4 values should be used as the final result. If one of the 4 values exceeds the average value by ±15% again, then this set of results is invalid.

[0071] The pressure generated by the maximum piston wind pressure of 1 kPa is converted into a load mass of 163 g. Since the vibration frequency and wind load generated by vehicle driving in the tunnel do not always remain at the maximum state, the actual tunnel vibration frequency generated by vehicle driving is less than 20 Hz and the wind load is also less than the load corresponding to 163 g. However, since the tunnel service life generally exceeds 10 years and our usual test time cannot be carried out according to the tunnel service life, the frequency and load are taken at the most extreme state and appropriately enlarged. Through a large number of verification tests, the vibration test frequency is selected as the maximum frequency of 20 Hz in the main frequency band of vehicle-induced vibration, the load is selected as 200 g, and the corresponding time is shortened to 2 h. The relevant verification test data are shown in Table 1. After verification test analysis, the bonding strength after applying vibration is on average reduced by 15% - 25% compared with the bonding strength before application.

[0072] Table 1 Comparative analysis of the change in bonding strength before and after vibration

[0073]

[0074]

[0075] Through the verification tests of five tunnel fireproof coating products provided by five domestic enterprises, the following conclusions can be drawn: If enterprises maintain their original product formulas, 80% of the products can pass the anti-vibration performance test requirements. 20% of the products can meet the anti-vibration performance test requirements by adjusting the formula. Therefore, adding this test will not significantly increase the R & D and production cost burdens of enterprises.

[0076] The technical solutions of the present invention are not limited to the limitations of the above specific embodiments. Any technical deformation made according to the technical solutions of the present invention falls within the protection scope of the present invention.

Claims

1. An experimental device for testing the anti-vibration performance of tunnel fireproof coatings, characterized in that: It includes a vibration device, a test module, and a control system. The test module is detachably and fixedly arranged on the vibration device, and the control system is connected to the vibration device.

2. The anti-vibration performance test device for tunnel fireproof coatings according to claim 1, characterized in that: The vibration device includes a vibration test bench (1), a mounting bracket (2), and a fastening device (3). The lower end of the mounting bracket (2) is fixedly arranged on the vibration test bench (1). The mounting bracket (2) is of a frame structure. The fastening device (3) is arranged on the lower end face of the top of the mounting bracket (2). The fastening device (3) is detachably and fixedly connected to the test module. The upper end of the top of the mounting bracket (2) is connected to the control system.

3. The anti-vibration performance test device for tunnel fireproof coatings according to claim 2, characterized in that: The test module includes an adhesive strength test module, a compressive strength test module, and a flexural strength test module. The adhesive strength test module, the compressive strength test module, and the flexural strength test module are all detachably connected to the fastening device (3).

4. The test device for the anti-vibration performance of tunnel fireproof coatings according to claim 3, characterized in that: The adhesive strength test module includes a specimen bottom plate (4), a fireproof coating (5), a steel upper fixture for tensile testing (6), and a counterweight (7). The fireproof coating (5) is coated on the lower end face of the specimen bottom plate (4). The upper end of the steel upper fixture for tensile testing (6) is adhesively connected to the lower end face of the fireproof coating (5). The counterweight (7) is detachably and fixedly arranged at the lower end of the steel upper fixture for tensile testing (6). The specimen bottom plate (4) is detachably and fixedly connected to the fastening device (3). The compressive strength test module is of a cube structure, and the fireproof coating (5) is coated on the surface of the cube-shaped compressive strength test module. The flexural strength test module is of a plate structure, and the fireproof coating (5) is coated on the surface of the plate-shaped flexural strength test module.

5. The test device for the anti-vibration performance of tunnel fireproof coatings according to claim 4, characterized in that: The control system includes a sensor (8) and a console (9). The sensor (8) is arranged at the upper end of the top of the mounting bracket (2). The signal output end of the sensor (8) is connected to the signal input end of the console (9).

6. A test method for the anti-vibration performance test device of the tunnel fireproof coating as described in claim 5, characterized in that, It includes the following steps: (1) Fix and install the sensor (8) at the middle position of the top of the mounting bracket (2) to collect and feedback vibration signals. (2) Fix one or more of the adhesive strength test module, the compressive strength test module, and the flexural strength test module on the lower end face of the top of the mounting bracket (2) respectively through a fastening device (3). (3) Start the vibration test bench (1). The vibration test bench (1) drives the test module to vibrate through the mounting bracket (2). The sensor (8) feeds back signals to the console (9) in real time. The console (9) adjusts the vibration frequency, vibration amplitude, vibration direction, and vibration time in real time according to the feedback signals to ensure that the vibration meets the test requirements. (4) After the simulated vibration ends, remove the adhesive strength test module, the compressive strength test module, or the flexural strength test module. Detect the adhesive strength test module, the compressive strength test module, or the flexural strength test module respectively through an adhesive strength tester, a compressive strength tester, and a flexural strength tester to obtain test data.

7. The test method of the test device for the anti-vibration performance of tunnel fireproof coatings according to claim 6, characterized in that: The calculation of the adhesive strength test is as follows: f b = F / A In the formula: f b —— Bond strength; F —— Maximum tensile load; A —— Bonding area.

8. The test method of the test device for the anti-vibration performance of tunnel fireproof coatings according to claim 6, characterized in that: The calculation of the compressive strength test is as follows: R = P / A2 Where: R —— compressive strength; P —— maximum load; A2 —— compression area.

9. The test method of the test device for the anti-vibration performance of tunnel fireproof coatings according to claim 6, characterized in that: The flexural strength test calculation is as follows: Where: T —— flexural strength; p —— failure load; L —— span; b —— specimen cross-section width; e —— specimen cross-section thickness.

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