Test system for real-time monitoring and evaluation of bridge service environment

Abstract

The invention provides a test system for real-time monitoring and evaluation of a bridge service environment. The test system comprises a natural environment test rack, and a meteorological factor monitoring instrument and a corrosion factor monitoring instrument are arranged on the natural environment test rack; the natural environment test rack comprises a base and a frame arranged on the base, one end of the base is provided with a U-shaped part, the opening of the U-shaped part faces downwards, the U-shaped part is clamped and hung on a protective edge at the top of a pier, the other end of the base is provided with a buckling part, and the base is locked on a steel structure cross beam of a bridge through the buckling part. Atmospheric environment monitoring and natural environment testing of the bridge are combined together, the corrosion degree of the bridge steel structure is stably and accurately evaluated / monitored in a simple, convenient and safe mode by means of the specific structure, and no damage is caused to the bridge. And the corrosion condition of equipment or system steel structural members mounted on the squatting seat in a humid environment can be effectively monitored.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge health status assessment / monitoring, and in particular relates to a test system for real-time monitoring and assessment of a bridge service environment. Background Art

[0002] Steel structure bridges are affected by various natural environmental factors and stress factors such as loads in the environment. These factors can cause corrosion fatigue of bridge steel and other structural parts, greatly increasing the safety hazards of bridges. In order to accurately characterize the impact and evolution process of these factors on steel structure bridges, it is necessary to monitor and predict their corrosion level. However, at present, there has been no convenient, reliable and accurate technical means for monitoring the corrosion level of bridges, especially cross-river / cross-sea bridges.

[0003] Among the existing solutions, document CN111191318A discloses a corrosion fatigue life prediction method and system for a large-span bridge cable system, which collects environmental parameters, obtains the working environment of the cable system, and establishes an environmental acceleration spectrum suitable for estimating the corrosion fatigue life of the bridge through the environmental equivalent relationship according to the corrosion damage equivalence principle. The load spectrum is established by extracting the cable stress time history, and the corrosion fatigue life is predicted after adjusting the corrosion influence coefficient. Although this solution can be used to predict the fatigue life of bridge cables, it is not suitable for evaluating / monitoring the degree of corrosion of bridge steel structures.

[0004] At present, when evaluating / monitoring the degree of corrosion of bridge steel structures under use, it is usually necessary to directly use the meteorological factor data of the area where the bridge is located, and cooperate with mechanical sensors such as stress and strain to monitor its load conditions. Obviously, this does not fully consider the impact of natural environmental corrosion factors on the bridge steel structure, and its accuracy needs to be further improved.

[0005] More importantly, when monitoring the natural environment corrosion of bridge steel structures, it is impossible to sample and evaluate the bridge steel structure itself. The ideal solution is to place the same type of benchmark steel structure samples of the bridge in the actual service environment of the bridge to conduct natural environment tests. However, the bridge steel structure is in a high-hanging dangerous area, which makes the implementation process very difficult and dangerous. Therefore, how to stably and accurately evaluate / monitor the corrosion degree of bridge steel structures in a simple and safe way is a technical challenge currently faced. Summary of the invention

[0006] At least in order to solve the technical problems mentioned in the background technology, the present invention aims to provide a test system for real-time monitoring and evaluation of the service environment of a bridge.

[0007] The present invention adopts the following technical solution.

[0008] A test system for real-time monitoring and evaluation of the service environment of a bridge includes a natural environment test frame, on which a meteorological factor monitoring instrument and a corrosion factor monitoring instrument are arranged; wherein the natural environment test frame includes a base and a frame arranged on the base, one end of the base has a U-shaped portion, the opening of the U-shaped portion faces downward, the U-shaped portion is clamped on the guardrail at the top of the pier, and the other end of the base is provided with a snap-fit ​​portion, through which the base is locked to the steel structure beam of the bridge; when the bridge vibrates, the natural environment test frame can vibrate at the same frequency as the bridge, so that the sample on the natural environment test frame can accurately reflect the combined effects of stress factors and environmental factors experienced by the steel structure bridge. As a preferred embodiment, the corrosion factor monitoring instrument includes a corrosion simulation hanger arranged on the frame, the corrosion simulation hanger is electrically connected to the corrosion current monitoring host, and the corrosion current monitoring host is connected to the computer control system for real-time monitoring of the corrosion current generated by the hanger.

[0009] During implementation, two or an even number of natural environment test frames are placed symmetrically, one part is used to characterize the corrosion of the benchmark metal under natural environmental factors and stress, which can be used to accurately evaluate the atmospheric corrosiveness of the bridge environment and describe the corrosion change process of the bare bridge material in the natural environment. The other part can be used for the quality assessment of the protection system, that is, after the benchmark metal is coated with the corresponding protection system, it is compared with the benchmark metal to compare the change process of the two in the natural environment. In order to further improve the safety during the monitoring process, the width of a single base is equal to the width of the steel structure legs of the beam.

[0010] Preferably, the frame and the base are connected by bolts.

[0011] Furthermore, the position and height of the sample mounting portion on the frame can be adjusted.

[0012] In order to further improve the accuracy of the monitoring results, the opening width of the U-shaped portion is 10-20 mm larger than the thickness of the guardrail.

[0013] Preferably, the U-shaped portion is made of a stainless steel plate with a wall thickness of 8 to 10 mm.

[0014] Furthermore, the steel structure legs of the base surrounding the crossbeam are distributed throughout the top of the pier, and a plurality of sets of natural environment test frames are arranged on the base, and the orientation of the sample installation part on each natural environment test frame is consistent with the actual orientation of the corresponding part of the crossbeam steel structure.

[0015] Beneficial effects: The present invention combines atmospheric environment monitoring of bridges with natural environment testing in an extremely simple and practical solution, and utilizes the aforementioned specific structure to achieve a stable and accurate assessment / monitoring of the corrosion degree of steel structures in the atmospheric environment where the bridge is located in a simple and safe manner without causing any damage to the bridge. During implementation, not only can the atmospheric environment in which the steel structure of the bridge is located be monitored more accurately, but it can also ensure that the environmental factors, corrosion factors, and vibration factors to which the specimen is subjected are almost the same as those of the steel structure of the bridge, while having the advantage of being easy to disassemble and assemble the entire test device. In addition, the scheme of the present invention can also be used to effectively monitor the corrosion of equipment or system steel structural parts installed on a squat seat in a humid environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of a test system for real-time monitoring and evaluation of bridge service environment in an embodiment; Figure 2 for Figure 1 A magnified image of the middle part; Figure 3 A schematic diagram of a base in an embodiment; Figure 4 It is a schematic diagram of the framework in the embodiment. DETAILED DESCRIPTION

[0017] The technical solution of the present invention is described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example 1

[0018] Combination Figures 1 to 4As shown, a test system for real-time monitoring and evaluation of the service environment of a bridge includes a natural environment test frame 1, on which a meteorological factor monitoring instrument (for real-time monitoring of corresponding atmospheric environmental factors) and a corrosion factor monitoring instrument are arranged; wherein, the natural environment test frame 1 includes a base 2 and a frame 3 arranged on the base 2, wherein one end of the base 2 has a U-shaped portion 4, the opening of the U-shaped portion 4 faces downward, and the U-shaped portion 4 is clamped on the guardrail 5 at the top of the pier, and the other end of the base 2 is provided with a buckle portion 6, through which the base 2 is locked on the steel structure beam of the bridge; when the bridge vibrates, the natural environment test frame 1 can vibrate synchronously with the bridge. wherein, the width of a single base 2 is equal to the width of the steel structure leg of the beam. the frame 3 is connected to the base 2 by bolts. the orientation and height of the sample mounting portion 7 on the frame 3 can be adjusted. the width of the opening of the U-shaped portion 4 is 15 mm larger than the thickness of the guardrail 5, and the U-shaped portion 4 is made of a stainless steel plate with a wall thickness of 10 mm. In this embodiment, the frame 3 can adopt the main structure of the adjustable environmental test frame developed in the early stage (see document CN212180746U for details), or the test frame in CN115144325A, and the sample fixture on the frame 3 is adaptively replaced according to the bridge steel structure sample. In this embodiment, the corrosion factor monitoring instrument includes a corrosion simulation hanging piece (specimen) arranged on the frame, the corrosion simulation hanging piece is electrically connected to the corrosion current monitoring host, and the corrosion current monitoring host is connected to the computer control system for real-time monitoring of the corrosion current generated by the hanging piece. Example 2

[0019] Combination Figure 2 As shown, a test system for real-time monitoring and evaluation of the service environment of a bridge includes a natural environment test frame 1, on which a meteorological factor monitoring instrument (for real-time monitoring of corresponding atmospheric environmental factors) and a corrosion factor monitoring instrument are arranged; wherein, the natural environment test frame 1 includes a base 2 and a frame 3 arranged on the base 2, one end of the base 2 has a U-shaped portion 4, the opening of the U-shaped portion 4 faces downward, the U-shaped portion 4 is clamped on the guardrail 5 at the top of the pier, and the other end of the base 2 is provided with a buckle portion 6, through which the base 2 is locked on the steel structure beam of the bridge; when the bridge vibrates, the natural environment test frame 1 can vibrate synchronously with the bridge. wherein, the frame 3 is connected to the base 2 by bolts. The orientation and height of the sample mounting portion 7 on the frame 3 can be adjusted. The width of the opening of the U-shaped portion 4 is 15 mm larger than the thickness of the guardrail 5, and the U-shaped portion 4 is made of a stainless steel plate with a wall thickness of 8 mm. In this embodiment, the steel structure legs of the base 2 surrounding the beam cover the entire top of the pier, and multiple groups of natural environment test frames 1 are arranged on the base 2. The orientation of the sample mounting portion 7 on each natural environment test frame 1 is consistent with the actual orientation of the corresponding local beam steel structure.

[0020] In the present invention, the meteorological factor monitoring instrument and the corrosion factor monitoring instrument are connected to the computer control system so as to provide real-time feedback and monitor the corresponding test data.

[0021] In the present invention, it is very important to use the natural environment test frame 1 of a specific structure in conjunction with the guardrail 5 on the top of the bridge pier, which can not only more accurately reflect the atmospheric environment of the bridge steel structure, but also ensure that the environmental factors, corrosion factors and vibration factors to which the sample is subjected are almost the same as those of the bridge steel structure. During the implementation process, in addition to the load, the water vapor formed under the bridge and the vibration to which the bridge steel structure is subjected are the main factors affecting the corrosion degree of the bridge steel structure. The natural environment test frame 1 is set on the top of the bridge pier through the solution of the present invention, which can just take into account the simultaneous action of water vapor and vibration on the bridge steel structure and the sample.

[0022] The present invention combines atmospheric environment monitoring of bridges with natural environment testing in an extremely simple and easy-to-operate scheme, and utilizes the aforementioned specific structure to achieve stable and accurate evaluation / monitoring of the corrosion degree of bridge steel structures in a simple and safe manner without causing any damage to the bridge, and has the advantage of being easy to disassemble and assemble the entire test device. In addition, the scheme of the present invention can also effectively monitor the corrosion of equipment or system steel structural parts installed on a squat seat with a guard edge in a humid environment.

Claims

1. A test system for real-time monitoring and evaluation of a bridge service environment, comprising a natural environment test stand (1), characterized in that: A meteorological factor monitoring instrument and a corrosion factor monitoring instrument are arranged on the natural environment test frame (1); wherein the natural environment test frame (1) comprises a base (2) and a frame (3) arranged on the base (2); one end of the base (2) comprises a U-shaped portion (4), the opening of the U-shaped portion (4) faces downward, the U-shaped portion (4) is hooked on a guardrail (5) at the top of a bridge pier, and the other end of the base (2) is provided with a buckle portion (6), and the base (2) is locked to a steel structure crossbeam of the bridge through the buckle portion (6); when the bridge vibrates, the natural environment test frame (1) can vibrate synchronously with the bridge.

2. The test system according to claim 1, characterized in that: The width of a single base (2) is equal to the width of the steel structure legs of the beam.

3. The test system according to claim 2, characterized in that: The frame (3) is connected to the base (2) via bolts.

4. The test system according to claim 3, characterized in that: The position and height of the sample mounting portion (7) on the frame (3) can be adjusted.

5. The test system according to any one of claims 1 to 4, characterized in that: The opening width of the U-shaped portion (4) is 10 to 20 mm greater than the thickness of the edge guard (5).

6. The test system according to claim 5, characterized in that: The U-shaped portion (4) is made of a stainless steel plate with a wall thickness of 8 to 10 mm.

7. The test system according to claim 1, characterized in that: The base (2) surrounds the steel structure legs of the crossbeam and covers the entire top of the pier. A plurality of natural environment test frames (1) are arranged on the base (2). The orientation of the sample mounting portion (7) on each natural environment test frame (1) is consistent with the actual orientation of the corresponding crossbeam steel structure.

8. The test system according to claim 5 or 7, characterized in that: The corrosion factor monitoring instrument comprises a corrosion simulation hanging piece arranged on a frame (3), the corrosion simulation hanging piece is electrically connected to a corrosion current monitoring host, and the corrosion current monitoring host is connected to a computer control system for real-time monitoring of the corrosion current generated by the hanging piece.

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