CN114279937B - Nondestructive testing device for permeability resistance of concrete structure - Google Patents

Abstract

The invention relates to a nondestructive testing device for the permeation resistance of a concrete structure, which is used for detecting chloride ion migration coefficients and comprises a first box body and a second box body which are used in pairs, wherein the bottoms of the first box body and the second box body are provided with opening and closing mechanisms, anode plates are fixed in the first box body and are provided with conductivity detection elements, cathode plates are fixed in the second box body, the first box body and the second box body are connected with a travelling mechanism through telescopic parts so as to realize the joint and separation state switching of the first box body and the bottom surface of the second box body and the concrete structure, and the detection device does not need to damage the concrete structure.

Description

A non-destructive testing device for the anti-penetration performance of concrete structures

technical field

The invention relates to the technical field of engineering testing equipment, in particular to a non-destructive testing device for the anti-penetration performance of concrete structures.

Background technique

The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art.

At present, the testing methods for the permeability of concrete structures mainly include chloride ion migration coefficient testing and electric flux testing.

For the detection of the chloride ion migration coefficient of concrete structures, there are problems of lack of detection technology, few detection devices, and great difficulty in detection. Many determinations of the chloride ion migration coefficient are mostly done through indoor tests. These methods are to simulate the raw material composition of the structure to measure the chloride ion migration coefficient of the specimen of a specified size.

CN103913401A retrieved provides a method for measuring the migration depth and apparent migration coefficient of chloride ions in concrete. To measure the chloride ion migration coefficient of concrete structures that have been in service for a period of time, one method adopted is to perform on-site core drilling and sampling in the laboratory. The method of layer-by-layer core drilling and sampling is not only cumbersome and difficult to sample, but also has high requirements for drilling equipment, and has certain limitations when implemented on site. At the same time, it will cause serious damage to the structure, and subsequent repair of holes is also a difficult task, and it cannot guarantee a good repair effect, but instead reduces the structure's ability to resist the migration of chloride ions to the inside.

For the detection of the electric flux of concrete structures, only the indoor test specimens are tested. Because the indoor test cannot accurately reflect the real electric flux of the concrete structure in service on site, and the indoor test device cannot be applied on site. In addition, bringing the samples taken from the on-site damage sampling of the concrete structure back to the laboratory for testing is more destructive to the on-site concrete structure; at the same time, the technical difficulty of the on-site damaged structure is relatively large, and the number of samples taken is limited, so it is difficult to reflect the overall electric flux of the on-site concrete structure to a certain extent.

To sum up, the current chloride ion migration coefficient detection and electric flux detection can only take samples from the site and bring them back to the laboratory for testing, which is very destructive to the concrete structure on site and increases the follow-up repair process.

Contents of the invention

The object of the present invention is to overcome the deficiencies of the prior art and provide a non-destructive testing device for the anti-permeability of concrete structures, which can perform non-destructive testing on site, avoiding damage to the concrete structure, and further eliminating subsequent repair procedures.

To achieve the above object, the present invention adopts the following technical solutions

In the first aspect, an embodiment of the present invention provides a non-destructive testing device for the anti-permeability performance of concrete structures, which is used to detect the chloride ion migration coefficient. It includes a first box and a second box used in pairs. The bottoms of the first box and the second box are open and provided with opening and closing mechanisms. The first box is fixed with an anode plate and a conductivity detection element is installed. The second box is fixed with a cathode plate.

Optionally, it also includes a negative pressure adsorption mechanism, the negative pressure adsorption mechanism includes a first fan, the first fan is fixedly connected to the first box and the second box through a connecting rod, and the first fan is also connected to the suction cup through a suction pipeline.

Optionally, a first through hole is provided on the air extraction pipeline, and a casing is sheathed on the outer periphery of the air extraction pipeline. The sleeve is provided with a second through hole that can cooperate with the first through hole. The sleeve is connected to a linear driver fixed on the air extraction pipeline. The linear driver can drive the sleeve to move along the axis of the air extraction pipeline to realize the switching between the alignment and staggered states of the first through hole and the second through hole.

Optionally, there are at least two pairs of the first box and the second box.

Optionally, airbags are installed in the first box and the second box, the airbags are connected to the second blower through an inflation pipeline, and the second blower is fixedly connected to the first box and the second box.

In the second aspect, the embodiment of the present invention provides a non-destructive testing device for the anti-permeability performance of concrete structures, which is used to detect electric flux. It includes an inner box and an outer box that are used in pairs and have an open bottom. The inner box and the outer box are connected as a whole through connectors. , The bottom surface of the outer box and the concrete structure can be switched between the joint and separate states.

Optionally, a sealing waterstop is provided on the bottom of the inner box and the outer box.

Optionally, the outer box is also connected with a fan, an air cover is arranged above the air outlet of the fan, the air cover is connected with one end of the inflation tube through a rotating mechanism, and the other end of the inflation tube is connected with the inner box and the air bag in the outer box.

Optionally, the rotating mechanism includes a rotating part sleeved on the outer periphery of the inflatable tube. A stepped hole is provided inside the rotating part, including a first hole with a larger diameter and a second hole with a smaller diameter. The second hole is fixed to the connecting pipe, and the tube wall of the inflatable tube is provided with a rotating driver. The output shaft of the rotating driver is connected to the first gear located in the first hole.

Optionally, the fan is also connected to the suction cup through an air extraction pipeline, the air extraction pipeline is provided with a third through hole, the outer periphery of the air extraction pipeline is provided with a sleeve, the sleeve is provided with a fourth through hole matching the third through hole, the sleeve is connected with a fixed linear drive on the air extraction pipeline, and the linear drive can drive the sleeve to move along the axis of the air extraction pipeline to achieve the switching between the alignment and staggered states of the third through hole and the fourth through hole.

Beneficial effects of the present invention:

1. The detection device of the present invention is provided with a telescoping mechanism connected to the running mechanism. The traveling mechanism can walk along the surface of the concrete structure, and the first box body, the second box body, the inner box, and the bottom surface of the outer box can be bonded to the concrete structure by using the telescopic parts. The element obtains the chloride ion permeability coefficient, and the electric flux is obtained by using the electric flux detection element. The whole process can be carried out on the concrete structure at the construction site. There is no need to take samples for indoor testing, which avoids damage to the concrete structure and saves the subsequent repair process.

2. The detection device of the present invention is provided with a blower fan and a suction cup, so that the detection device can be effectively fixed on the horizontal plane or the vertical plane or the inclined surface of the concrete structure, realizing the reliable effect of fixing for a long time, thus satisfying the time requirement of the test test.

3. In the detection device of the present invention, the first box body and the second box body are provided with airbags, and the second air blower is used to inflate the airbags to gradually press against the internal solution, so that the solution can cover the surface of the concrete structure more uniformly and ensure the uniformity of penetration. The outer box and the inner box use the airbags to squeeze the sponge to make the solution ooze out, so that the solution can quickly contact and always cover the surface of the structure. Not only can the uniformity of penetration be ensured, but also the detection rate can be accelerated, the detection time can be shortened, and efficient detection is realized.

4. The device of the present invention has a walking mechanism, so that the whole device has a moving function. When the detection site is at a higher position of the concrete structure, the device can reach the detection site quickly through the running mechanism without resorting to manpower and other machinery, thereby realizing full automation of the device.

5. The detection device of the present invention has a linear drive member, which can quickly switch between the sucker suction state and the relaxed state, and has high work efficiency and automation.

6. The detection device of the present invention has a sealing waterstop. When the waterstop absorbs liquid and expands, it can prevent the solution from leaking and wasting, and can prevent two kinds of liquids from mixing and polluting each other, so as to ensure accurate detection data.

Description of drawings

The accompanying drawings constituting a part of the present application are used to provide further understanding of the present application, and the schematic embodiments and descriptions of the present application are used to explain the present application and not to limit the present application.

Figure 1 is a schematic diagram of the overall structure of Embodiment 1 of the present invention;

Fig. 2 is a distribution schematic diagram of two pairs of first cabinets and second cabinets in Embodiment 1 of the present invention;

Fig. 3 is a schematic diagram 2 of the overall structure of Embodiment 1 of the present invention;

Fig. 4 is a schematic diagram 3 of the overall structure of Embodiment 1 of the present invention;

Fig. 5 is a cross-sectional view of the first box of Embodiment 1 of the present invention;

Fig. 6 is a sectional view of the second box body of Embodiment 1 of the present invention;

Figure 7 is a schematic diagram of the assembly of the air extraction pipeline and the suction cup in Embodiment 1 of the present invention;

Fig. 8 is a schematic diagram of the traveling mechanism of Embodiment 1 of the present invention;

Fig. 9 is a front view of the airbag in the second box according to Embodiment 1 of the present invention;

Fig. 10 is a top view of the airbag in the second box according to Embodiment 1 of the present invention;

Fig. 11 is a schematic diagram of the chloride ion migration route of the existing chloride ion migration coefficient detection device;

Figure 12 is a top view of the migration route of chloride ions in Example 1 of the present invention;

Figure 13 is a front view of the chloride ion migration route in Example 1 of the present invention;

Fig. 14 is a top view of the overall structure of Embodiment 2 of the present invention;

Fig. 15 is a bottom view of the overall structure of Embodiment 2 of the present invention;

Fig. 16 is a side view of the overall structure of Embodiment 2 of the present invention;

Fig. 17 is a side view of the overall structure of Embodiment 2 of the present invention;

Figure 18 is an axonometric view of the overall structure of Embodiment 2 of the present invention;

Fig. 19 is a schematic diagram of the walking mechanism of Embodiment 2 of the present invention;

Fig. 20 is a schematic diagram of the assembly of the third blower fan, air extraction pipeline and suction cup according to Embodiment 2 of the present invention;

Fig. 21 is a cross-sectional view of the inner box and the outer box when the airbag is not inflated according to Embodiment 2 of the present invention;

Fig. 22 is a cross-sectional view of the inner box and the outer box when the airbag is inflated according to Embodiment 2 of the present invention;

Fig. 23 is a top view of the airbag in the outer box and the inner box of Embodiment 2 of the present invention;

Fig. 24 is a front view of the rotation mechanism of Embodiment 2 of the present invention;

Fig. 25 is a side view of the rotation mechanism of Embodiment 2 of the present invention;

Fig. 26 is a bottom view of the inner box and the outer box of Embodiment 2 of the present invention;

Among them, 1. The first box body, 2. The second box body, 3. Fixed plate, 4. Telescopic plate, 5. Traveling mechanism installation shell, 6. L-shaped tube, 7. Traveling motor, 8. Traveling motor power supply, 9. Bevel gear transmission mechanism, 10. Axle, 11. Traveling wheel, 12. First fan, 13. Connecting rod, 14. Exhaust pipe, 15. Suction cup, 16. Sleeve, 17. Second through hole, 18. Anode solution injection port, 19. Anode power socket, 20. Anode plate, 21. Anode power line, 22. Cathode solution injection port, 23. Cathode power socket, 24. Cathode plate, 25. Cathode power line, 26. Cathode and anode power supply, 27. Control switch, 28. Conductivity meter socket, 29. Portable conductivity meter, 30. Anode electrode, 31. Cathode electrode, 32. Temperature sensor, 33. Second fan, 34. Inflatable pipeline, 35. Blower switch, 36. Air bag, 37. Sodium chloride solution , 38. Deionized water, 39. Sodium hydroxide solution, 40. Outer box, 41. Inner box, 42. Connector, 43. Platform, 44. Power supply, 45. Traveling motor, 46. Driving wheel shaft, 47. Traveling wheel, 48. Driven wheel shaft, 49. The third fan, 50. Connecting plate, 51. Suction cup, 52. Fan bracket, 53. Shell, 54. Sleeve, 55. Suction pipeline, 56. Second linear motor, 57 .Anode solution injection port, 58. Anode electrode socket, 59. Anode plate, 60. With cathode solution injection port, 61. And cathode electrode socket, 62. Cable bus, 63. Power socket, 64. Air bag, 65. Sponge, 66. Inflatable pipeline, 67. Anode power line, 68. Cathode power line, 69. Gas cover, 70. Rotating parts, 71. Rotating drive motor, 72. Output shaft, 73. First gear, 74. Waterproof sealing belt , 75. Cathode plate, 76. Wireless transmission module.

Detailed ways

Example 1

This embodiment provides a non-destructive testing device for the anti-permeability performance of concrete structures, which is used for testing the migration coefficient of chloride ions. As shown in Figures 1-4, the first box 1 and the second box 2 used in pairs are included. In this embodiment, in order to ensure the accuracy of the test results, multiple pairs of the first box 1 and the second box 2 are provided. Preferably, two pairs of the first box 1 and the second box 2 are provided. As shown in Figure 2, one pair is the first box A1 and the second box B1, and the other pair is the first box A2 and the second box B2.

The first box body 1 and the second box body 2 are arranged vertically, so that the two first box bodies 1 and the two second box bodies 2 form a square structure.

Between the adjacent first box body 1 and the second box body 2, a running mechanism installation shell 5 is provided. The first box body 1 and the second box body 2 are connected as a whole through the running mechanism installation shell 5. The inside of the running mechanism installation shell 5 is connected with a running mechanism through a telescopic part. The running mechanism can drive the entire detection device to walk along the surface of the concrete structure. The telescopic movement of the telescopic part can realize the switch between the bonding and separation states of the bottom surface of the first box body 1 and the second box body 2 and the surface of the concrete structure.

In order to allow the solution to infiltrate into the concrete structure in the first box 1 and the second box 2, the bottoms of the first box 1 and the second box 2 are open, and the openings are provided with opening and closing mechanisms for controlling the opening and closing of the bottom openings.

In this embodiment, the open opening and closing mechanism adopts a telescopic plate structure, and the telescopic plate structures of the first box body 1 and the second box body 2 are the same, and the telescopic plate structure in the first box body 1 is used as an example for illustration:

As shown in Figures 5-6, the telescopic plate structure includes a fixed plate 3, the fixed plate 3 is provided with a telescopic groove, the telescopic groove is provided with a telescopic element, the telescopic element adopts an electric telescopic rod or a hydraulic telescopic rod, the telescopic element is fixed inside the telescopic groove, the telescopic part of the telescopic element is connected with a telescopic plate 4, and the telescopic plate 4 is slidably connected with the telescopic groove, and can be telescopically moved relative to the fixed plate under the drive of the telescopic element, so as to realize the opening and closing of the bottom opening.

In this embodiment, since the width of the telescopic plate 4 is equal to the width of the fixed plate, the telescopic groove is arranged along the same length of the fixed plate. In order to prevent water leakage, the two side edges of the telescopic plate 4 and the front edge in the telescopic direction are provided with sealing strips.

The telescopic movement of the telescopic plate 4 driven by the telescopic element can realize the opening or closing of the bottom opening of the first box body 1 .

The structure of the opening and closing mechanism of the second box body 2 is exactly the same as that of the opening and closing mechanism of the first box body, and will not be described in detail here.

The telescopic part adopts an electric hydraulic cylinder, the cylinder body of the electric hydraulic cylinder is fixed inside the running mechanism installation shell 5, the piston rod of the electric hydraulic cylinder is vertically arranged, the piston rod of the electric hydraulic cylinder is connected with the vertical pipe section of the L-shaped pipe 6, the horizontal pipe section of the L-shaped pipe 6 stretches out to the outside of the running mechanism installation shell 5, and the running mechanism installation shell 5 is provided with a vertical chute, and the horizontal pipe section extends to the outside of the running mechanism installation shell 5 through the vertical chute.

As shown in Figure 8, a travel motor 7 is installed in the vertical pipe section, and the travel motor 7 is powered by a travel motor power supply 8 located in the vertical pipe section. The output shaft of the travel motor 7 is connected to the axle 10 through a bevel gear transmission mechanism 9, and the axle 10 is supported by a bearing seat in the horizontal pipe section. The axle 10 extends to the outside of the horizontal pipe section and is connected with a travel wheel 11.

The walking mechanism can walk on the surface of the concrete structure, and the piston rod of the electro-hydraulic cylinder can perform vertical telescopic movement, and then drive the first box 1 and the second box 2 to perform lifting movements, so as to realize the switching between the bottom surface of the first box 1 and the second box 2 and the surface of the concrete structure.

The electric hydraulic cylinder is equipped with a battery to ensure its normal operation.

The square structure formed by the two first boxes 1 and the two second boxes 2 is provided with a first fan 12 inside, and the first fan 12 is fixedly connected with the two first boxes 1 and the two second boxes 2 through connecting rods 13 . The power supply and power supply line of the first fan 12 are arranged in the hollow connecting rod 13 .

The first blower 12 is connected by one end of four air suction pipelines 14, and the other end of the suction pipeline 14 is provided with a suction cup 15. Preferably, the suction cup 15 is a rubber suction cup. In this embodiment, a suction cup 15 is provided on the outside of the first box body 1 and the second box body 2. The first fan 12 can work and generate negative pressure, so that the entire detection device is firmly adsorbed on the surface of the concrete structure. The surface further enhances the fixing strength between the entire detection device and the concrete structure, so that the detection device can be effectively fixed on the horizontal or vertical or inclined surface of the concrete structure, achieving a reliable effect of long-term fixation, thus meeting the time requirements of the test test.

As shown in Figure 7, the outer circumference of the exhaust pipeline 14 is covered with a sleeve 16, the exhaust pipeline 14 is provided with a first through hole, the sleeve 16 is provided with a second through hole 17 matched with the first through hole, the end of the sleeve 16 is connected with a linear driver fixed on the exhaust pipeline 14, the linear driver adopts a first linear motor 18, and the first linear motor 18 can drive the sleeve 16 to move along the axial direction of the exhaust pipeline 14. When the first through hole and the second through hole 17 are aligned, External air can enter the suction cup, so that the suction cup is separated from the surface of the concrete structure. When the first through hole and the second through hole 17 are staggered, the sleeve 16 can be close to the exhaust pipeline 14, so that the first through hole is closed. Under the action of the first fan 12, a vacuum is formed in the suction cup 15, and it is firmly adsorbed on the surface of the concrete structure.

An anode solution injection port 18 is provided on the top box wall of the first box body 1 for injecting the anode solution into the first box body 1. In the present embodiment, the anode solution shown is deionized water, and an anode power supply socket 19 is also provided on the top box wall of the first box body 1. The anode power supply socket 19 is fixed with an anode plate 20 by a support rod, and the anode plate 20 is located inside the first box body 1.

The top box wall of the second box body 2 is provided with a cathodic solution injection port 22, which is used to inject the cathodic solution in the second box body 2. The cathodic solution in the present embodiment is a sodium chloride solution. The top box wall of the second box body 2 is also provided with a cathode power supply socket 23. The cathode power supply socket 23 is fixed with a cathode plate 24 by a support rod. The cathode plate 24 is located inside the second box body 2.

Further, the anolyte solution injection port 18 and the cathodic solution injection port 22 are provided with plugging caps.

The other end of the anode power line 21 and the cathode power line 25 is connected to the cathode and anode power supply 26 on the top of the running gear mounting case 5 , and is controlled on and off by a control switch 27 .

The first box body 1 is provided with a conductivity meter socket 28, and a conductivity detection element is connected through the conductivity meter socket 28. Preferably, the conductivity detection element is a portable conductivity meter 29.

The anode electrode 30 , cathode electrode 31 and temperature sensor 32 of the portable conductivity meter 29 are inserted into the first box 1 through the conductivity meter socket 28 .

As shown in Figures 9-10, in this embodiment, a second fan 33 is also installed on the outer side of the top shell wall of the running mechanism installation shell 5. The second fan adopts a small blower with its own battery and is controlled by a blower switch 35. The small blower is connected to the air bag 36 arranged inside the first box 1 and the second box 2 through an inflation pipeline 34. The area of the air bag in the first box is smaller than the horizontal cross-sectional area of the space in the first box, and the area of the air bag in the second box is smaller than the horizontal section of the space in the second box. area, the edges of the airbag are connected by connecting wires, and the small air blower can inflate the airbag. Preferably, the airbag adopts a rubber folded airbag.

In this embodiment, the walking motor, the first fan, the second fan, the portable conductivity meter, the telescopic element, the electrohydraulic cylinder and other components are all connected to the control system, and the control system is connected to the remote monitoring platform through the wireless transmission module, and can transmit the collected information to the remote monitoring platform, and at the same time, the staff can send instructions to the control system through the remote monitoring platform.

The chloride ion migration path diagram in the traditional concrete chloride ion migration coefficient detection device is shown in Figure 11. The electrode is inserted into the sodium hydroxide solution 39 above the concrete structure. Under the action of the current, the chloride ions in the sodium chloride solution 37 migrate at an accelerated rate for a period of time, and finally reach the inside of the concrete specimen. The chloride ion migration path diagram in the device of this embodiment is shown in Figures 12-13. Under the action of the current, the chloride ions in the sodium chloride solution in the second box migrate at an accelerated rate for a period of time. The chloride ions first reach the superficial layer of the concrete structure, and then migrate to the first box filled with deionized water 38. At this time, the conductivity of the deionized water changes. When the slope of the conductivity-time curve tends to be constant, the corresponding parameters are substituted into the determined ion migration equation to obtain the chloride ion migration coefficient. The device in this embodiment detects the chloride ion migration coefficient of the shallow surface layer of the concrete structure, and the depth is 20 mm.

The specific working method of the detection device of the present embodiment comprises the following steps:

The testing staff checks the airtightness of the bipolar liquid storage tanks, and then injects 2L of 10% sodium chloride solution into the second box through the cathode solution injection port, injects 2L of deionized water into the first box through the anode solution injection port, and tightens the plugs of the cathode solution injection port and the anode solution injection port; connect the plugs connecting the cathode power line and the anode power line to the corresponding cathode power socket and anode power socket; connect the portable conductivity meter to the conductivity meter socket 13.

The detection staff places the device of this embodiment on the surface of the concrete structure, presses the first fan to start, and the first fan starts to work, so that the device of the present invention is fixed on the surface of the concrete structure; the movement of the traveling wheels in the mobile device is adjusted through the wireless control module, and it reaches the detection site after moving for a period of time.

Through the wireless control module, the piston rod of the electric hydraulic cylinder is retracted until the lower surfaces of the first box body and the second box body are completely attached to the surface of the concrete structure. Due to the pressure caused by the drop of the device in this embodiment, the suction cup is attached to the surface of the structure. Under the action of the first fan, the suction cup 27 and the air in the suction pipeline are drawn out, and the suction cup is better adsorbed on the surface of the concrete structure. The fixing effect of the internal and external linkage fixing device is far greater than that of a single fixing device.

The telescopic part of the telescopic element starts to retract through the wireless control module, and the solution in the first box and the second box seeps out to the surface of the concrete structure until the telescopic part of the telescopic element is completely retracted, and the solution completely contacts the surface of the concrete structure and penetrates into the interior of the concrete structure.

The control switch is activated through the wireless control module, and the current is transmitted to the anode plate and the cathode plate through the electrode power line. After the solution in the first box and the second box conducts electricity, because the cathode and anode solutions are different, a voltage is formed between the anode plate and the cathode plate, which accelerates the solution to penetrate into the structure.

Start the portable conductivity meter through the wireless control module, the portable conductivity meter starts to work, and measure the temperature of the deionized water in the first box by measuring the voltage between the two electrodes and the temperature sensor and transmit it to the automatic temperature compensator inside the portable conductivity meter. The conductivity meter internally calculates the conductivity of the deionized water and transmits it to the remote monitoring platform through the data transmission module.

When the detection time is 6 hours, the liquid in the first box and the second box penetrates into a part of the structure. Due to gravity, the liquid in the first box and the second box is not uniform. In order to ensure the uniformity of penetration, the small blower switch is activated through the remote control module, and the small electric blower starts to work. The wind enters the airbag through the inflation pipeline and stretches it, so that the airbag is pressed against the liquid in the first box and the second box, so that the liquid is evenly spread on the surface of the concrete structure.

The remote monitoring platform can monitor the conductivity of the deionized water in the first tank. When the slope of the conductivity-time curve is constant, that is, when the steady-state electromigration arrives, the concentration-time curve is obtained through temperature correction according to the relationship between conductivity and concentration, and is substituted into the equation to calculate the chloride ion migration coefficient.

Wherein is the chloride ion diffusion coefficient obtained from the ion migration test;

K _B is a constant;

T is the absolute temperature;

Z _i is the ion valence;

e _o is the electronic power;

l is the electrode plate spacing;

A is the migration surface area;

V is the volume of the anode storage tank;

U is the voltage between electrodes;

C is the chloride ion concentration of cathode sodium chloride solution;

dc, dt are the rate of change of the initial and final concentration of chloride ions.

After the test is completed, the first linear motor drives the casing to move so that the first through hole and the second through hole are aligned. At this time, the external air enters the suction cup, breaking the pressure difference between the inside and outside of the suction cup, so that the suction cup returns to a relaxed state; the electric hydraulic cylinder is controlled by the wireless control module, and the walking wheel is slowly lowered. The first box and the second box are separated from the concrete structure, making the device of this embodiment easy to move. Protection prediction and durability evaluation.

In this embodiment, two sets of the first box body, the second box body and corresponding equipment are set up, and the stability of the chloride ion migration coefficient of the concrete at the detected position is judged by the test results, which can avoid the influence of unstable factors on the test data and make the data more reliable, which has important practical significance for further structural life prediction.

Example 2

This embodiment discloses a non-destructive testing device for the anti-penetration performance of concrete structures, which is used to detect the electric flux of concrete structures. As shown in Figures 14-18, it includes an outer box 40 and an inner box 41 used in pairs.

In this embodiment, for the accuracy of measurement results, multiple sets of outer boxes 40 and inner boxes 41 used in pairs are provided, preferably two sets of outer boxes 40 and inner boxes 41 are provided.

The two outer boxes are connected as a whole through a platform 43 , and an electric flux detection element 44 is arranged on the platform 43 .

The bottom surface of the platform 43 is connected to the traveling mechanism through a telescopic part. Preferably, the telescopic part is an electric hydraulic cylinder, and the piston rod of the electrohydraulic cylinder is connected to the traveling mechanism.

As shown in Figure 19, the traveling mechanism includes a traveling mechanism installation shell, and the inside of the traveling mechanism installation casing is provided with a power supply 44. The power supply is used to supply power to the traveling motor. The traveling motor 45 is connected to the driving wheel shaft 46 through gear transmission.

The electro-hydraulic cylinder can drive the platform up and down, and then drive the movement of the outer box and the inner box, thus realizing the switching between the bonding and separation states of the bottom surface of the outer box and the inner box and the surface of the concrete structure.

As shown in Figure 20, a third fan 49 is provided on both sides of the outer box, the third fan 49 is fixedly connected to the outer box through a connecting plate 50, and the third fan 49 is connected to a suction cup 51 through an air suction pipeline. Preferably, a third fan is connected to two suction pipelines and the suction cup. In this embodiment, the suction cup is a rubber suction cup.

The power supply of the third fan is arranged in the hollow connecting plate, the power lines of the third fan are all arranged in the fan bracket 52 , and the fan bracket is fixed on the inner wall of the housing 53 of the third fan.

The third fan can extract the air in the suction cup, which in turn allows the suction cups to adsorb on the surface of the concrete structure. There is a third -pass hole on the pipe pipe road, 55 outer pipelines with pipes with a sleeve 54, and the fourth -pass hole that can cooperate with the third -pass hole. Machine 56, the second linear motor can drive the sleeve to move along the axis direction of the pipeline, and then realize the switch between the third and fourth -pass hole alignment and staggered state.

The top box wall of the outer box is provided with an anode solution injection port 57 and an anode electrode socket 58, and the anode solution injection port is used to inject an anode solution (deionized water), and the anode electrode socket is connected with an anode plate 59 by a support rod and a screw, and the anode plate is connected with one end of the anode power line 67.

The top box wall of the inner box is provided with a cathode solution injection port 60 and a cathode electrode socket 61, and the cathode solution injection port is used to inject the cathode solution (sodium chloride solution), and the cathode electrode socket is connected with a cathode plate 75 by a support rod and a screw, and the cathode plate is connected with one end of the cathode power line 68.

The other ends of the anode power line and the cathode power line are connected to the electric flux detection element through the cable bus 62 and the power socket 63. The electric flux detection element can be an existing electric flux detection instrument, and its specific structure will not be described in detail here.

As shown in Figures 21-23, both the outer box and the inner box are provided with an air bag 64. Preferably, the air bag adopts an inflation pressure air bag, and the space below the inflation pressure air bag is provided with a sponge 65. The sponge in the outer box is placed above the anode plate, and the sponge in the inner box is placed above the cathode plate. The sponge fills the space between the air bag, the anode plate, and the cathode plate.

The outer box and the inner box use the air bag to squeeze the sponge to make the solution seep out, which can make the solution quickly contact and always cover the surface of the structure, which not only ensures the uniformity of penetration, but also speeds up the detection rate, shortens the detection time, and realizes efficient detection.

The airbag in the outer box is connected with the air cover 69 above the third blower fan on one side of the outer box through the inflation pipeline 66, the rotating mechanism and the connecting pipe. The air covering is connected with the rotating mechanism through the connecting pipe.

The air bag in the inner box is connected with the air cover above the third fan on the other side of the outer box through the inflation pipeline and the rotating mechanism.

The rotating mechanism can drive the connecting pipe to rotate, and then drive the air cover to rotate, thereby realizing the switching of the state that the wide mouth of the air cover is facing the third blower and away from the third blower.

As shown in Figures 24-25, the rotating mechanism includes a rotating part 70 set on the outer periphery of the inflatable tube. A stepped hole is provided inside the rotating part, including a first hole with a larger diameter and a second hole with a smaller diameter. The second hole is fixed to the connecting pipe. A rotating drive is provided on the wall of the inflatable tube. The rotating drive uses a rotating drive motor 71. The output shaft 72 of the rotating drive is connected to the first gear 73 located in the first hole. The second gear on the inflatable tube is meshed, and the frictional force between the first gear and the second gear is used to axially position the rotating part. In some other embodiments, the second gear is also provided with a limiter, and the limiter is embedded in a limit groove opened on the step surface formed by the first hole and the second hole to limit the rotation in the axial direction.

As shown in Figure 26, the bottom surface of the outer box and the inner box is also provided with a water-stop sealing strip 74. When the water-stop strip absorbs liquid and expands, it can prevent the solution from leaking and wasting, and can prevent the two liquids from mixing and polluting each other, so as to ensure accurate detection data.

In this embodiment, the walking motor, the second linear motor, the rotating drive motor, the electrohydraulic cylinder, the electric flux detection element and other components are all connected to the control system, and the control system is connected to the remote monitoring platform through the wireless transmission module 76 .

The working method of the detection device of the present embodiment comprises the following steps:

Fill the outer box and the inner box with sponges through the bottoms of the outer box and the inner box, and fasten the anode plate and the cathode plate to the bottom of the support rod with luding. The detection solution is respectively injected into the sponge through the anode solution injection port and the cathode solution injection port until liquid seeps out from the bottom of the sponge.

Insert the main power line 6 into the power line jack of the electric flux detection instrument, insert the anode electrode line into the anode electrode jack of the outer box, and insert the cathode power line 8 into the cathode electrode jack on the upper part of the inner box.

The inspector puts the device of this embodiment on the surface of the concrete structure, starts the power supply of the third fan, and the third fan starts to work. The device of this embodiment is fixed on the surface of the concrete structure, and the inspector can only let go.

Start the traveling mechanism, and the traveling mechanism will walk to the detection position. By controlling the electro-hydraulic cylinder inside the traveling mechanism, the wheels of the traveling mechanism can be slowly raised until the bottom of the outer box and the inner box are in contact with the surface of the concrete structure.

Start the second linear motor on the upper side of the air extraction pipeline in the fixed device through the wireless remote control module, so that the third through hole and the fourth through hole are staggered, and the suction cup is adjusted to enter the adsorption state. At this time, the whole device is firmly fixed on the surface of the concrete structure; turn the drive motor, so that the wide mouth of the air cover faces downward, and the wind discharged by the third fan is blown into the inflation pipeline and enters the internal expansion pressure air bag, squeezing the liquid in the sponge 30. area effect.

The element of the electric flux detector is started through the wireless remote control module, and the element of the electric flux detector applies a DC voltage of 60V to the two electrodes through the main power line 6, and records the current value passing through the surface concrete in real time. After 6 hours of electrification, the controller obtains the value of the electric flux passing through the surface concrete according to the real-time current value of 6 hours after electrification. Its internal calculation electric flux formula is:

Q＝900(I ₀ +2I ₃₀ +2I ₆₀ +...+2I _t +...+2I ₃₀₀ +2I ₃₃₀ +2I ₃₆₀ )

In the formula: Q——the passing electric flux (C);

I ₀ ——Initial current (A), accurate to 0.001A;

I _t - current (A) at time t (min), accurate to 0.001A.

The range of concrete detected by the device of the present invention is the area size of the inner and outer chamber connectors 1-3, and the depth is about 20mm.

7) Transmission of the data detected by the electric flux detection element 20, the wireless transmission module transmits the data detected by the electric flux detection element 20 to the remote monitoring platform, and the staff can process the data on the remote monitoring platform.

8) After the data is measured, after the detection is completed, start the rotating drive motor by operating the wireless transmission module, and the wide mouth of the air cover 12 faces upwards. At this time, the wind discharged by the fan cannot enter it, and the sponge rebounds to squeeze the gas in the expansion pressure airbag 27 to the outside to achieve the effect of diffusing air; then start the second linear motor on the air extraction pipeline to align the third through hole with the fourth through hole.

9) By controlling the electric hydraulic cylinder through the wireless transmission module, the traveling mechanism can be lowered, so that the bottom of the outer box and the inner box are separated from the structural surface; the traveling mechanism is started, and the device in this embodiment returns to the original path to complete the inspection.

Although the specific implementation of the present invention has been described above in conjunction with the accompanying drawings, it does not limit the protection scope of the present invention. Those skilled in the art should understand that on the basis of the technical solution of the present invention, various modifications or deformations that those skilled in the art can make without creative labor are still within the protection scope of the present invention.

Claims (4)

1. The nondestructive testing device for the permeability resistance of the concrete structure is used for detecting the chloride ion migration coefficient and is characterized by comprising a first box body and a second box body which are used in pairs, wherein the bottoms of the first box body and the second box body are provided with an opening and closing mechanism, an anode plate is fixed in the first box body and is provided with a conductivity detection element, a cathode plate is fixed in the second box body, and the first box body and the second box body are connected with a travelling mechanism through telescopic parts so as to realize the joint and separation state switching of the bottom surfaces of the first box body and the second box body and the concrete structure;

still include negative pressure adsorption equipment, negative pressure adsorption equipment includes first fan, and first fan passes through connecting rod and first box and second box fixed connection, and first fan still is connected with the sucking disc through the pipeline of bleeding.

2. The nondestructive testing device for the permeability resistance of a concrete structure according to claim 1, wherein the pumping pipe is provided with a first through hole, a sleeve is sleeved on the periphery of the pumping pipe, the sleeve is provided with a second through hole which can be matched with the first through hole, the sleeve is connected with a linear driving piece fixed on the pumping pipe, and the linear driving piece can drive the sleeve to move along the axial direction of the pumping pipe so as to realize the alignment and staggering switching of the first through hole and the second through hole.

3. A concrete structure permeation resistance nondestructive testing device according to claim 1, wherein said first and second tanks are provided in at least two pairs.

4. The nondestructive testing device for the permeability resistance of a concrete structure according to claim 1, wherein air bags are further installed in the first box body and the second box body, the air bags are connected with a second fan through an air charging pipeline, and the second fan is fixedly connected with the first box body and the second box body.