Rebar local corrosion monitoring device based on composite reinforced concrete structure

Abstract

The invention discloses a reinforcing steel bar local corrosion monitoring device based on a composite reinforced concrete structure, and belongs to the technical field of concrete monitoring, the reinforcing steel bar local corrosion monitoring device comprises concrete and a reinforcing steel bar pre-buried in the concrete, and a cylindrical groove is formed in the concrete in the outer side of the reinforcing steel bar; a plurality of annular detection assemblies are evenly distributed in the cylindrical groove at intervals in the circumferential direction of the steel bar, each annular detection assembly comprises an arc-shaped detection block, a solution cavity is formed in the inner side of each arc-shaped detection block, a pressure sensor is installed in each solution cavity, and connecting holes are formed in the two sides of each arc-shaped detection block and used for being connected with an elastic hose; the solution cavities of every two adjacent arc-shaped detection blocks are communicated through an elastic hose, the solution cavity of at least one arc-shaped detection block is connected with a liquid filling connector, and the liquid filling connector is connected with a liquid filling pipe so that the solution cavities can be filled with hydraulic oil. A corrosion pit detection piece is installed on the arc-shaped face, facing the side where the steel bars are located, of the arc-shaped detection block. The device provided by the invention can realize on-line monitoring of reinforced concrete corrosion.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of concrete monitoring, and particularly relates to a reinforcing steel bar local corrosion monitoring device based on a composite reinforced concrete structure. BACKGROUND

[0002] As an important traffic hub in coastal areas, the terminal building is exposed to a harsh environment of high humidity and high salt mist for a long time, and the concrete structure, especially the internal reinforcing steel material, faces severe corrosion challenges. Chloride ions in the coastal atmosphere penetrate into the surface of the reinforcing steel through the pores of the concrete, destroy the passivation film and trigger electrochemical corrosion, leading to reinforcing steel section loss, concrete protective layer cracking and even structure load capacity reduction, which seriously threatens the safety and durability of the terminal building. Traditional reinforced concrete structures generally have the problems of fast corrosion rate and strong concealment in the coastal environment, especially the terminal building which is a large-span building with high load requirements and dense reinforcing steel, and the volume expansion caused by corrosion products will accelerate the spalling of the concrete protective layer, forming a vicious cycle. Therefore, a reinforcing steel local corrosion monitoring device that can be embedded in the internal composite reinforced concrete structure is urgently needed, which can realize online monitoring of reinforced concrete corrosion, provide early warning for the structural strength of reinforced concrete, and provide data support for the optimization of the proportioning of the corrosion-resistant composite concrete and the protection design of the terminal building. SUMMARY

[0003] In view of this, the purpose of the present application is to provide a reinforcing steel local corrosion monitoring device based on a composite reinforced concrete structure, which can solve the above technical problems.

[0004] To achieve the above purpose, the present application provides the following technical scheme: The reinforcing steel local corrosion monitoring device based on a composite reinforced concrete structure disclosed by the present application comprises a concrete and a reinforcing steel embedded in the concrete, a cylindrical groove is formed in the concrete outside the reinforcing steel, a plurality of annular detection assemblies are uniformly and interval distributed in the cylindrical groove along the circumference of the reinforcing steel, the annular detection assembly comprises an arc-shaped detection block, a solution cavity is formed on the inner side of the arc-shaped detection block, a pressure sensor is installed in the solution cavity, connecting holes are formed on both sides of the arc-shaped detection block, the connecting holes are used for connecting elastic hoses, the solution cavities of adjacent two arc-shaped detection blocks are communicated through the elastic hoses, the solution cavity of at least one arc-shaped detection block is connected with a liquid filling connector, the liquid filling connector is connected with a liquid filling pipe to fill hydraulic oil into the solution cavity; a rust pit detection piece is installed on the arc-shaped surface of the arc-shaped detection block on the side facing the reinforcing steel, and the rust pit detection piece is used for monitoring the depth and range of the rust pits on the surface of the reinforcing steel.

[0005] Further, the rust pit detection piece comprises an outer tube fixed on the arc surface of the arc detection block on the side facing the steel bar, a through hole is formed on the side wall of one end of the solution cavity, an inner rod is slidably and sealingly arranged at the outer end of the outer tube, and a displacement sensor and an elastic supporting device are connected between the inner rod and the outer tube; a central passage is formed in the center of the inner rod and communicates with the inner cavity of the outer tube, a branch passage is formed at the lower end of the inner rod and communicates with the central passage, and an air bag is installed in the branch passage and communicates with the central passage.

[0006] Further, the inner rod comprises a first semicircular rod and a second semicircular rod, a straight groove is formed on the plane of the first semicircular rod and the second semicircular rod, the planes of the first semicircular rod and the second semicircular rod are in contact with each other to form the inner rod, the straight grooves on the first semicircular rod and the second semicircular rod cooperate to form the central passage, a branch passage is formed on the inner side of the lower end of the first semicircular rod and the second semicircular rod, the first semicircular rod and the second semicircular rod are detachably connected, and a step for installing the air bag is formed on the inner wall of the straight groove.

[0007] Further, the outer tube is threadedly connected with the arc detection block, and the length of the outer tube extending into the solution cavity can be adjusted by rotating the outer tube.

[0008] Further, a ball is installed at the lower end of the inner rod, and the ball is rollingly installed in a ball groove formed at the lower end of the inner rod.

[0009] Further, a protection tube is pre-embedded in the cylindrical groove, at least two groups of retaining rings are formed on the inner side of the protection tube, each group of retaining rings is correspondingly provided with a group of annular detection assemblies, each group of retaining rings comprises two retaining rings, an annular groove for cooperating with the annular detection assembly is formed between the two retaining rings, a rolling rod is rollingly installed on the outer side of the steel bar, and the two ends of the rolling rod are respectively matched with the arc detection blocks of the two groups of annular detection assemblies.

[0010] Further, two groups of protection rings are further formed on the inner side of the protection tube, and the two groups of annular detection assemblies and the rolling rod are installed in the region formed by the two groups of protection rings in the axial direction.

[0011] Further, the elastic hose is made of an elastic material, the elastic hose presses the annular detection assembly against the surface of the steel bar when the annular detection assembly is opened by the steel bar, and the rolling rod is used for rollingly supporting the arc detection block of the annular detection assembly.

[0012] The beneficial effects of the present application are as follows: The steel bar local corrosion monitoring device based on the composite reinforced concrete structure can monitor the depth and range of the rust pits on the surface of the steel bar through the rust pit detection piece installed on the annular detection assembly, thereby prewarning the structural strength of the reinforced concrete and providing data support for the ratio optimization and protection design of the corrosion-resistant composite concrete of the coastal terminal building.

[0013] Other advantages, objectives, and features of the invention will be set forth in the following description and will be apparent to those skilled in the art in some respects, or may be learned by practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0014] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the following figures are provided for illustration: Figure 1 This is a schematic diagram of the monitoring device of the present invention; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 This is a schematic diagram of the arc-shaped detection block; Figure 4 This is a schematic diagram of the structure of the rust pit detection component; Figure 5 This is a schematic diagram of the inner rod being compressed inward. Figure 6 A schematic diagram of the branch channel structure; Figure 7 This is a cross-sectional view of the rolling rod.

[0015] The following are labeled in the attached diagram: 1. Concrete; 2. Reinforcing bar; 3. Cylindrical groove; 4. Annular detection component; 5. Arc-shaped detection block; 6. Solution chamber; 7. Pressure sensor; 8. Connecting hole; 9. Elastic hose; 10. Filling connector; 11. Outer tube; 12. Through hole; 13. Inner rod; 14. Displacement sensor; 15. Elastic support device; 16. Central channel; 17. Branch channel; 18. Airbag; 19. First semi-circular rod; 20. Second semi-circular rod; 21. Straight groove; 22. Step; 23. Ball bearing; 24. Ball groove; 25. Protective tube; 26. Retaining ring; 27. Rolling rod; 28. Protective ring; 29. ​​Strain gauge. Detailed Implementation

[0016] like Figures 1-7 As shown, the present invention discloses a local corrosion monitoring device for steel bars based on a composite reinforced concrete structure, including concrete 1 and steel bars 2 embedded in the concrete 1. The steel bars 2 extend longitudinally, and a cylindrical groove 3 is formed in the concrete 1 on the outside of the steel bars 2. The diameter of the cylindrical groove 3 is larger than the diameter of the steel bars 2. The cylindrical groove 3 is coaxially opened on the outside of the steel bars 2. The length of the cylindrical groove 3 is smaller than the length of the entire steel bar 2. Only a section of the steel bar 2 is selected for corrosion monitoring.

[0017] A plurality of annular detection assemblies 4 are evenly spaced along the circumference of the steel bar 2 in the cylindrical groove 3, each annular detection assembly 4 comprising an arc-shaped detection block 5, the inner side of the arc-shaped detection block 5 forming a solution cavity 6, which is mainly used for containing hydraulic oil. A pressure sensor 7 is installed in the solution cavity 6, which is mainly used for monitoring the pressure in the solution cavity 6. When the corrosion pit detection piece acts, the pressure decreases, which can reflect the corrosion condition of the steel bar 2 to a certain extent.

[0018] A connecting hole 8 is formed on both sides of the arc-shaped detection block 5, which is used to connect an elastic hose 9. The elastic hose 9 has a certain elastic prestress, but is not easy to be expanded after the initial pressure is applied, and is made of rubber or silicone material. The solution cavities 6 of adjacent two arc-shaped detection blocks 5 are communicated through the elastic hose 9, and the whole annular detection assembly 4 is communicated together through the arc-shaped detection blocks 5.

[0019] In order to facilitate the addition of hydraulic oil therein, at least one solution cavity 6 of the arc-shaped detection block 5 is connected with a liquid filling connector 10 in the application, the liquid filling connector 10 is connected with a liquid filling pipe to fill the solution cavity 6 with hydraulic oil; a corrosion pit detection piece is installed on the arc-shaped surface of the arc-shaped detection block 5 facing the side where the steel bar 2 is located, which is used for monitoring the depth and range of the corrosion pit on the surface of the steel bar 2. By installing a plurality of annular detection assemblies 4 on the outer side of the local position of the steel bar 2, the corrosion pit detection piece installed on the annular detection assembly 4 can monitor the depth and range of the corrosion pit on the surface of the steel bar 2, so as to prewarn the structural strength of the concrete 1 of the steel bar 2, and provide data support for the ratio optimization and protection design of the corrosion-resistant composite concrete 1 of the coastal terminal building.

[0020] In the embodiment, the rust pit detection member comprises an outer tube 11 extending along the radial direction of the steel bar 2, the outer tube 11 is fixed on the arc surface of the arc detection block 5 on the side facing the steel bar 2, that is, the inner end of the outer tube 11 is in communication with the solution cavity 6, and the outer end of the outer tube 11 extends outward. A through hole 12 is formed in the side wall of one end of the solution cavity 6, the through hole 12 is close to the inner end of the outer tube 11, the outer end of the outer tube 11 is slidingly sealed with an inner rod 13, a displacement sensor 14 and an elastic support device 15 are connected between the inner rod 13 and the outer tube 11, a central passage 16 is formed in the center of the inner rod 13 and is in communication with the inner cavity of the outer tube 11, a branch passage 17 is formed in the lower end of the inner rod 13 and is in communication with the central passage 16, and an air bag 18 is installed in the branch passage 17. When the outer end of the inner rod 13 is located at the last end of the outer tube 11 under the abutting action of the steel bar 2, the side surface of the inner rod 13 blocks the through hole 12, at this time, the hydraulic oil cannot overflow, after the steel bar 2 is corroded, the outer end of the inner rod 13 is no longer constrained and is displaced outward under the action of the supporting spring until the inner rod 13 leaks out of the through hole 12, at this time, the hydraulic oil in the solution cavity 6 can enter the inner side of the outer tube 11 through the through hole 12, and then enter the air bag 18 through the intermediate passage and the branch passage 17, under the action of the initial pressure, the air bag 18 is driven to expand, and the micro air bag 18 can fill the hollow position of the corroded steel bar 2 to release the pressure.

[0021] In the embodiment, the inner rod 13 comprises a first semicircular rod 19 and a second semicircular rod 20, the first semicircular rod 19 and the second semicircular rod 20 are symmetrical relative to the center plane of the inner rod 13, a straight groove 21 is formed in the plane of the first semicircular rod 19 and the second semicircular rod 20, the planes of the first semicircular rod 19 and the second semicircular rod 20 are in contact with each other to form the inner rod 13, the straight grooves 21 on the first semicircular rod 19 and the second semicircular rod 20 cooperate to form the central passage 16, the branch passages 17 are formed in the inner sides of the lower ends of the first semicircular rod 19 and the second semicircular rod 20, the first semicircular rod 19 and the second semicircular rod 20 are detachably connected, the two can be connected by glue or by screws, so as to facilitate the installation of the air bag 18. The inner wall of the straight groove 21 is formed with a step 22 for installing the air bag 18.

[0022] In the embodiment, the outer tube 11 is threadedly connected with the arc detection block 5, by rotating the outer tube 11, the length of the outer tube 11 extending into the solution cavity 6 can be adjusted to adapt to the actual needs. The lower end of the inner rod 13 is provided with a ball 23, the ball 23 is rollingly installed in a ball groove 24 formed in the lower end of the inner rod 13, and by rolling cooperation, the position of the arc detection block 5 can be adjusted conveniently in the initial installation.

[0023] In the embodiment, the protective tube 25 is embedded in the cylindrical groove 3, the inner side of the protective tube 25 is formed with at least two groups of retaining rings 26, each group of retaining rings 26 is correspondingly provided with a group of annular detection assemblies 4, each group of retaining rings 26 is two, and an annular groove for matching the annular detection assembly 4 is formed between the two retaining rings 26, which can conveniently adjust the position of the annular detection assembly 4 in the circumferential direction, and can also limit the axial position of the annular detection assembly 4, the outer side of the reinforcing steel bar 2 is rotatably provided with a rolling rod 27, and the two ends of the rolling rod 27 are respectively matched with the arc-shaped detection blocks 5 of the two groups of annular detection assemblies 4.

[0024] In the embodiment, the inner side of the protective tube 25 is also formed with two groups of protective rings 28, and the two groups of annular detection assemblies 4 and the rolling rod 27 are arranged in the region formed by the two groups of protective rings 28 in the axial direction, so that impurities can be prevented from entering the device and affecting the device, and the accuracy of subsequent data detection can be ensured.

[0025] In the embodiment, the elastic hose 9 is made of an elastic material, when the annular detection assembly 4 is expanded by the reinforcing steel bar 2, the elastic hose 9 presses the annular detection assembly 4 against the surface of the reinforcing steel bar 2, and the rolling rod 27 is used for rolling supporting the arc-shaped detection block 5 of the annular detection assembly 4. In the embodiment, at least one rolling rod 27 is provided with a strain gauge 29, and the bending degree of the reinforcing steel bar 2 can be monitored through the bending of the strain gauge 29, so as to adapt to the actual needs.

[0026] The working principle and process of the present application are as follows: Before the concrete 1 is poured, first, a reinforcing steel bar 2 is selected, and two groups of annular detection assemblies 4 are sleeved on the outer side of the reinforcing steel bar 2, and the two groups of annular detection assemblies 4 are arranged in the axial direction. In the circumferential direction of the reinforcing steel bar 2, the arc-shaped detection blocks 5 of each group of annular detection assemblies are connected by an elastic hose 9, and then a plurality of rolling rods 27 are inserted between the surface of the reinforcing steel bar 2 and the arc-shaped detection blocks 5 along the axial direction of the reinforcing steel bar 2, under the elastic pre-tensioning force of the elastic hose 9, the arc-shaped detection blocks 5 are pressed against the rolling rod 27 along the radial direction, and the rolling rod 27 can rolling support the arc-shaped detection blocks 5.

[0027] Then the arc-shaped detection block 5 is pulled back and forth along the circumference to adjust the annular monitoring assembly, the annular monitoring assembly can rotate around the axis of the steel bar 2, under the manual observation of the operator, so that the corrosion pit detection piece avoids the original defects of the steel bar 2, avoids false detection, and finally the tension of the elastic hose 9 of the annular monitoring assembly is kept as uniform as possible to avoid local stress concentration. Since the diameter of the steel bar 2 is greater than the initial inner diameter of the arc-shaped detection block 5 as a whole, after the annular monitoring assembly is installed, the inner rod 13 is displaced inward under the support pressure of the steel bar 2, and in the initial state, the inner rod 13 closes the through hole 12. Then the arc-shaped detection block 5 is installed with the protection tube 25, after installation, the concrete 1 is poured, and attention is paid to lead out the lead wire and the liquid filling pipe. After the concrete 1 is poured and cured, the liquid hydraulic oil is filled into the solution cavity 6 through the introduced liquid filling pipe and the liquid filling joint 10, the hydraulic oil is filled into each solution cavity 6 through the transmission of the elastic hose 9, the hydraulic oil is continuously filled inward, so that the inner side of the solution cavity 6 has a certain initial pressure. When the steel bar 2 surface is corroded, the diameter of the steel bar 2 decreases, the inner rod 13 loses the constraint, and under the support force of the support spring, the inner rod 13 moves outward, under the action of the initial pressure, the hydraulic oil can flow out through the branch channel 17 of the inner rod 13, the pressure in the solution cavity 6 decreases, which can be monitored through the pressure sensor 7 and the displacement sensor 14, the greater the reading value of the displacement sensor 14, the greater the radial displacement distance of the inner rod 13, and the more serious the corrosion of the diameter of the steel bar 2.

[0028] It can be understood that the reading of the pressure sensor 7 is also linearly related to the surface corrosion of the steel bar 2, the more the surface corrosion of the steel bar 2, the greater the inflation of the air bag 18, at this time the pressure in the solution cavity 6 decreases, and the reading of the pressure sensor 7 is smaller, and the micro air bag 18 can fill the hollow area of the corroded steel bar 2 surface.

[0029] Finally, it should be pointed out that the above preferred embodiments are only used to illustrate the technical solutions of the present application and are not limiting, although the present application has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present application.

Claims

1. A device for monitoring localized corrosion of reinforcing bars based on a composite reinforced concrete structure, comprising concrete and reinforcing bars embedded in the concrete, characterized in that: Located on the outside of the reinforcing bar, a cylindrical groove is formed within the concrete. Multiple annular detection components are evenly distributed within the cylindrical groove along the circumference of the reinforcing bar. Each annular detection component includes an arc-shaped detection block. A solution cavity is formed on the inner side of the arc-shaped detection block, and a pressure sensor is installed inside the solution cavity. Connection holes are opened on both sides of the arc-shaped detection block for connecting flexible hoses. The solution cavities of two adjacent arc-shaped detection blocks are connected through flexible hoses. At least one arc-shaped detection block's solution cavity is connected to a filling connector, which connects to a filling pipe to fill the solution cavity with hydraulic oil. A rust pit detection element is installed on the arc-shaped surface of the arc-shaped detection block facing the reinforcing bar. The rust pit detection element is used to monitor the depth and extent of rust pits on the surface of the reinforcing bar.

2. The device for monitoring localized corrosion of reinforcing steel bars based on a composite reinforced concrete structure according to claim 1, characterized in that: The rust pit detection component includes an outer tube, which is fixed on the arc-shaped surface of the arc-shaped detection block facing the reinforcing bar. A through hole is opened on the side wall of the outer tube at one end of the solution chamber. An inner rod is slidably sealed at the outer end of the outer tube. A displacement sensor and an elastic support device are connected between the inner rod and the outer tube. A central channel communicating with the inner cavity of the outer tube is formed in the center of the inner rod. A branch channel communicating with the central channel is formed at the lower end of the inner rod. An air bladder is installed in the branch channel. The liquid inlet of the air bladder is connected with the central channel.

3. The device for monitoring localized corrosion of reinforcing steel bars based on a composite reinforced concrete structure according to claim 2, characterized in that: The inner rod includes a first semicircular rod and a second semicircular rod. Straight grooves are formed on the planes of the first and second semicircular rods. The planes of the first and second semicircular rods contact each other to form the inner rod. The straight grooves on the first and second semicircular rods cooperate to form a central channel. Support channels are formed on the inner side of the lower ends of the first and second semicircular rods. The first and second semicircular rods are detachably connected. The inner wall of the straight groove is formed with a step for installing the airbag.

4. The device for monitoring localized corrosion of reinforcing steel bars based on a composite reinforced concrete structure according to claim 3, characterized in that: The outer tube is threadedly connected to the arc-shaped detection block. By rotating the outer tube, the length of the outer tube extending into the solution cavity can be adjusted.

5. A device for monitoring localized corrosion of reinforcing steel bars based on a composite reinforced concrete structure according to claim 2, characterized in that: The lower end of the inner rod is equipped with ball bearings, which roll within a groove formed at the lower end of the inner rod.

6. A device for monitoring localized corrosion of reinforcing steel bars based on a composite reinforced concrete structure according to any one of claims 1-5, characterized in that: A protective tube is pre-embedded in the cylindrical groove. At least two sets of retaining rings are formed on the inner side of the protective tube. Each set of retaining rings corresponds to a set of annular detection components. There are two retaining rings in each set. An annular groove for the annular detection components to cooperate is formed between the two retaining rings. A rolling rod is rolled on the outer side of the reinforcing bar. The two ends of the rolling rod cooperate with the arc-shaped detection blocks of the two sets of annular detection components.

7. A device for monitoring localized corrosion of reinforcing steel bars based on a composite reinforced concrete structure according to claim 6, characterized in that: Two sets of protective rings are formed on the inner side of the protective tube, and two sets of annular detection components and a rolling rod are installed in the area formed by the axial spacing of the two sets of protective rings.

8. The device for monitoring localized corrosion of reinforcing steel bars based on a composite reinforced concrete structure according to claim 7, characterized in that: The flexible hose is made of elastic material. When the annular detection component is stretched open by the steel bar, the flexible hose presses the annular detection component tightly against the surface of the steel bar. The rolling rod is used to provide rolling support for the arc-shaped detection block of the annular detection component.

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