Device and method for detecting thickness of steel bar protective layer of high-rise floor

Abstract

The invention relates to the technical field of reinforcing steel bar protective layer measuring equipment, in particular to a high-rise floor reinforcing steel bar protective layer thickness detection device and a detection method thereof. The supporting frame is installed on the scanner body, clamping blocks are arranged on the two sides of the supporting frame, the walking mechanism drives the crawler belt to move autonomously along the wall face, the scanner body detects the position of a reinforcing steel bar and the thickness of a protective layer in real time, and it is ensured that the device is stably adsorbed to the wall face of a high-rise floor by combining a vacuum adsorption system (an elastic sleeve, a cavity and a vacuum pump); manual lifting operation is completely replaced, the high-altitude operation risk is remarkably reduced, and the detection efficiency and the coverage precision are improved; the marking mechanism automatically draws a longitudinal straight line through the equipment advancing track, an electromagnet drives a sliding block to transversely move to draw a vertical straight line, the steel bar position is accurately marked through a cross coordinate, space-time errors caused by traditional manual marking are eliminated, and accurate positioning of follow-up repairing work is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of steel bar protective layer measuring equipment, and in particular to a device and method for detecting the thickness of a steel bar protective layer of a high-rise floor slab. Background Art

[0002] In the construction of modern reinforced concrete structures such as high-rise buildings and large public facilities, precise control of the thickness of the floor slab reinforcement cover is one of the key indicators to ensure the durability, safety, and usability of the structure. Currently, the commonly used floor slab reinforcement cover thickness detection technology in the industry mainly relies on handheld rebar scanners. There are generally two specific operation methods: Direct handheld scanning: The inspector directly moves the steel bar scanner on the floor surface. After the instrument detects the steel bar, the protective layer thickness value is displayed on the screen or prompted by sound.

[0003] Extension pole assisted scanning: For areas located at high places (such as high-rise floors) or areas that are not easily accessible to personnel, the steel bar scanner is fixed to the top of a long pole, and the ground personnel hold the long pole for scanning and detection.

[0004] However, the above existing technologies have the following significant drawbacks, which seriously restrict the detection efficiency and accuracy, especially in the detection of high-rise floors: The level of automation is extremely low, relying on intensive manual operation: The entire inspection process (including instrument movement, positioning, reading, and marking) is almost entirely completed manually by inspectors. Operators are required to maintain a bent waist, raised arms, or tilted head posture for extended periods, which is particularly tiring and inefficient when working at height. When inspecting large floor slabs, manually moving the instrument to cover the entire area is time-consuming.

[0005] The rebar location marking process is cumbersome and error-prone: When the location of a specific rebar (e.g., a point where cover thickness fails) needs to be recorded, existing technology typically requires operators to manually mark the target rebar on the floor surface after the instrument detects it. This marking process itself is cumbersome. More importantly: Positioning deviation: When using a handheld or long-pole device, there is a time lag and spatial movement between the operator identifying the target rebar (as indicated by the instrument) and the actual marked location. Slight shaking of the handheld device, deflection of the long pole, and errors in the human eye's judgment of the marked point can easily lead to significant deviations between the marked position and the actual rebar location. This deviation makes subsequent verification and repair work difficult to accurately locate, affecting the effectiveness of quality control.

[0006] Difficulties and risks associated with high-altitude marking: Marking rebar on the underside of high-rise floor slabs (at the ceiling level) is extremely challenging. Operators must utilize an aerial work platform or hanging basket, looking upwards to perform marking. This is not only inconvenient and inefficient, but also poses safety risks. Marking accuracy and clarity are also difficult to ensure due to limitations in posture and operating environment.

[0007] Limited detection efficiency and coverage: The movement speed and path planning of manual operations are very arbitrary, which easily leads to missed inspection areas. Manual operation fatigue will also lead to a decline in the quality of subsequent inspections.

[0008] In summary, the existing technology for detecting the thickness of the protective layer of steel bars in floor slabs based on handheld steel bar scanners has prominent problems such as low degree of automation, high labor intensity, cumbersome and poor precision of the steel bar position marking process (especially the proneness to position deviation in the marking process), difficult and dangerous high-altitude marking, low detection efficiency, and inconvenient data recording and management. With the development of high-rise and super-high-rise buildings and the increasing demand for refined management of engineering quality, there is an urgent need for a new detection device and method that can overcome the above-mentioned defects, realize automation of the detection process, high-precision positioning, label-free or automatic labeling, and efficient data collection and management, so as to improve detection efficiency, accuracy and operational safety. To this end, we propose a detection device and method for the thickness of the protective layer of steel bars in high-rise floor slabs. Summary of the Invention

[0009] In order to solve the above technical problems, the present invention provides a device for detecting the thickness of the protective layer of steel bars of high-rise floor slabs, comprising a scanner body and further comprising: A support frame, the support frame is mounted on the scanner body, and blocks are provided on both sides of the support frame. A buckle is installed on the support frame, and the buckle and the block cooperate with each other to fix the scanner body on the support frame; There are two sets of hanging ears, which are respectively arranged on both sides of the support frame, and the first turning frame and the second turning frame are respectively installed on the two sets of hanging ears through the first rotating shaft and the second rotating shaft; The moving mechanism has two groups, each group has two, which are respectively arranged on both sides of the first flip frame and the second flip frame. The moving mechanism drives the scanner body fixed by the support frame to move. When the scanner body is located on the wall, the support frame is adsorbed on the wall through negative pressure while moving.

[0010] Preferably, the traveling mechanism consists of three parts: a supporting member, a traveling member, and an adsorption member. The supporting member is used to connect the whole to the first flip frame and the second flip frame respectively. The traveling member is used to drive the equipment to move as a whole. The adsorption member generates negative pressure between the traveling member and the wall. The supporting member includes support plates respectively installed on both sides of the first flip frame and the second flip frame. A support shaft is installed through the support plate, and there are several support shafts.

[0011] Preferably, the traveling member includes a transmission wheel sleeved on a supporting shaft, wherein a servo motor is mounted on one of the supporting shafts, and a crawler track is sleeved on the periphery of the transmission wheel, and the crawler track connects all the transmission wheels.

[0012] Preferably, the adsorption part includes an elastic sleeve that is sleeved on the periphery of the track, and the elastic sleeve is evenly divided into several chambers. A vacuum pump is installed on the support plate, and the suction end of the vacuum pump is connected to an air box through a sealing bearing. The air box is connected with an air pipe, and the number of air pipes is equal to the number of chambers in the elastic sleeve, and the end away from the air box is respectively connected to one of the chambers in the elastic sleeve. A sealing ring is installed in the air box, and a first electric-controlled valve is provided on the sealing ring. The number of the first electric-controlled valve is equal to the number of air pipes, and the connection positions of the first electric-controlled valve and the air pipe and the air box correspond one-to-one. A second electric-controlled valve is installed on the elastic sleeve, and the number of the second electric-controlled valve is equal to the number of chambers in the elastic sleeve, and they are respectively arranged on one of the chambers, located on the side away from the track.

[0013] Preferably, the elastic sleeve is made of aviation cloth and has a thickness of 0.2-0.5 mm.

[0014] Preferably, a tripod is installed on the support plates on both sides of the first flip frame, and a metal tube is installed on the tripod. One end of the metal tube is connected to the exhaust end of the vacuum pump at the corresponding position, and the other end is installed with a high-pressure gas nozzle, and the high-pressure gas nozzle is in a straight line shape.

[0015] Preferably, a marking mechanism is installed on the second turning frame, and the marking mechanism is used to mark the position of the steel bar, including a slide rail installed on the second turning frame, a slider slidingly provided on the slide rail, an inverted paint bucket installed through the slider, the paint bucket contains peelable paint mixed with fluorescent agent, a nozzle is provided on the top of the paint bucket, an electromagnet is installed on one side of the slide rail, a metal plate is fixed on one side of the slider, and also includes a pressure member installed on one of the vacuum pumps on the corresponding side.

[0016] Preferably, the pressurizing member includes a pressurizing tube, one end of which is connected to the bottom end of the paint bucket, and a transfer box is provided at the other end. The transfer box is connected to the exhaust end of the vacuum pump on one side of the second flip frame through a pipeline. The transfer box is respectively provided with a third electrically controlled valve and a fourth electrically controlled valve. The switching states of the third electrically controlled valve and the fourth electrically controlled valve are opposite, and the third electrically controlled valve is located at the position where the pressurizing tube and the transfer box are connected.

[0017] A detection method, comprising the above-mentioned device for detecting the thickness of the steel bar protective layer of a high-rise floor slab, further comprising the following steps: S1: The staff fixed the scanner body to the support frame by cooperating with the blocks and buckles on both sides of the support frame. The staff unfolded the first and second flip frames and rotated them through the first and second rotating shafts to a working position parallel to the wall to be measured. The equipment was moved to the wall of a high-rise floor, with the first flip frame located in the front position in the direction of travel. The elastic sleeves of the two sets of travel mechanisms were initially fitted to the wall. S2: Start the vacuum pump to extract air from the chamber in the elastic sleeve that is about to contact the wall through the air box and air pipe. At the same time, open the second electric control valve of the corresponding chamber, open the corresponding first electric control valve, and close the other first and second electric control valves to generate negative pressure in the chamber so that it is adsorbed to the wall. Start the servo motor to drive the transmission wheel to rotate, and drive the equipment to move along the wall via the crawler belt. S3: The scanner body continuously transmits detection signals during movement, receives reflected signals from the steel bars inside the concrete, processes the signal data in real time, and determines the position of the steel bars and the thickness of the protective layer; S4: The compressed air discharged from the vacuum pump is transported to the high-pressure air nozzle through the metal pipe, and a high-speed airflow is ejected to remove the dust on the path to be scanned; S5: When the scanner detects that the position of the steel bar needs to be marked, the marking mechanism is triggered to close the fourth electric control valve and open the third electric control valve, so that the compressed air discharged by the vacuum pump enters the paint bucket through the transfer box and the pressure pipe, pressurizing the paint bucket. The forward movement of the equipment can draw a longitudinal straight line. The electromagnet attracts or repels the metal plate, driving the slider and the paint bucket to slide along the slide rail to draw a transverse straight line. Through two mutually perpendicular straight lines, the position to be marked can be accurately marked.

[0018] Preferably, the high-speed airflow ejected from the high-pressure air nozzle in step S4 is in a straight line shape and covers an area with a width greater than the width of the track.

[0019] The present invention has at least the following beneficial effects: 1. The crawler tracks are driven by a travel mechanism to move autonomously along the wall. The scanner body detects the position of the steel bars and the thickness of the protective layer in real time. Combined with the vacuum adsorption system (elastic sleeve, chamber, vacuum pump), the device is stably adsorbed on the high-rise floor wall, completely replacing manual lifting operations, significantly reducing the risks of high-altitude operations, and improving detection efficiency and coverage accuracy. 2. The marking mechanism automatically draws a longitudinal straight line using the equipment's travel trajectory, and uses an electromagnet to drive the slider to move horizontally to draw a vertical straight line. The cross coordinates accurately mark the position of the steel bar, eliminating the time and space errors of traditional manual marking and ensuring accurate positioning of subsequent repair work. 3. The compressed air discharged from the vacuum pump forms a straight high-speed airflow through the high-pressure air nozzle, which clears the dust on the scanning path in advance, avoids dust interference with signal detection, and prolongs the service life of the vacuum pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the top view of the structure of the present invention; Figure 3 For the present invention Figure 2 Schematic diagram of the structure at A in the middle; Figure 4 This is a schematic diagram of the structure of the present invention when viewed from above; Figure 5 For the present invention Figure 4 Schematic diagram of the structure at B in the middle; Figure 6 For the present invention Figure 4 Schematic diagram of the structure at C in the middle; Figure 7 This is a partial internal schematic diagram of the adsorption component of the present invention; Figure 8 For the present invention Figure 7 Schematic diagram of the structure at point D in the middle.

[0021] In the figure: 1. Scanner body; 2. Support frame; 21. Block; 22. Buckle; 23. Ear; 24. First rotating shaft; 25. Second rotating shaft; 26. First flip frame; 27. Second flip frame; 3. Traveling mechanism; 31. Support member; 311. Support plate; 312. Support shaft; 32. Traveling member; 321. Drive wheel; 322. Servo motor; 323. Track; 33. Adsorption member; 331. Elastic sleeve; 332. Vacuum pump ; 333, air box; 334, air pipe; 335, sealing ring; 336, first electric-controlled valve; 337, second electric-controlled valve; 4, tripod; 41, metal tube; 42, high-pressure air nozzle; 5, marking mechanism; 51, slide rail; 52, slider; 53, paint bucket; 54, nozzle; 55, electromagnet; 56, metal plate; 57, pressurizing part; 571, pressurizing tube; 572, transfer box; 573, third electric-controlled valve; 574, fourth electric-controlled valve. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention 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 making creative efforts are within the scope of protection of the present invention. Example 1:

[0023] See also Figures 1-8 The present invention provides a technical solution: a device for detecting the thickness of the protective layer of steel bars of a high-rise floor, comprising a scanner body 1, and further comprising: A support frame 2 is mounted on the scanner body 1, and blocks 21 are provided on both sides of the support frame 2. A buckle 22 is mounted on the support frame 2, and the buckle 22 and the block 21 cooperate with each other to fix the scanner body 1 on the support frame 2; There are two sets of hanging ears 23, which are respectively arranged on both sides of the support frame 2. The first flip frame 26 and the second flip frame 27 are respectively installed on the two sets of hanging ears 23 through the first rotating shaft 24 and the second rotating shaft 25; The traveling mechanism 3 has two groups, each group has two, which are respectively arranged on both sides of the first flip frame 26 and the second flip frame 27. The traveling mechanism 3 drives the scanner body 1 fixed by the support frame 2 to move. When the scanner body 1 is located on the wall, the support frame 2 is adsorbed on the wall through negative pressure while moving.

[0024] The traveling mechanism 3 is composed of three parts: a support member 31, a traveling member 32, and an adsorption member 33. The support member 31 is used to connect the entire device to the first flip frame 26 and the second flip frame 27 respectively. The traveling member 32 is used to drive the entire device to move. The adsorption member 33 generates negative pressure between the traveling member 32 and the wall. The support member 31 includes support plates 311 respectively installed on both sides of the first flip frame 26 and the second flip frame 27. A support shaft 312 is installed through the support plate 311, and there are several support shafts 312.

[0025] The moving member 32 includes a transmission wheel 321 sleeved on a support shaft 312 , wherein a servo motor 322 is mounted on one of the support shafts 312 , and a crawler belt 323 is sleeved on the periphery of the transmission wheel 321 , which connects all the transmission wheels 321 .

[0026] The adsorption member 33 includes an elastic sleeve 331 sleeved on the periphery of the crawler 323, and the elastic sleeve 331 is evenly divided into several chambers. A vacuum pump 332 is installed on the support plate 311. The air extraction end of the vacuum pump 332 is sleeved with an air box 333 through a sealed bearing. The air box 333 is connected to an air pipe 334. The number of air pipes 334 is equal to the number of chambers in the elastic sleeve 331, and the end away from the air box 333 is respectively connected to one of the chambers in the elastic sleeve 331. A sealing ring 335 is installed in the air box 333, and a first electrically controlled valve 336 is provided on the sealing ring 335. The number of the first electrically controlled valves 336 is equal to the number of the air pipes 334, and the connection positions of the first electrically controlled valves 336 and the air pipes 334 and the air box 333 correspond one to one. A second electrically controlled valve 337 is installed on the elastic sleeve 331, and the number of the second electrically controlled valves 337 is equal to the number of chambers in the elastic sleeve 331, and they are respectively arranged on one of the chambers, located on the side away from the track 323.

[0027] The elastic sleeve 331 is made of aviation cloth and has a thickness of 0.2-0.5 mm.

[0028] A tripod 4 is installed on the support plates 311 located on both sides of the first flip frame 26, and a metal tube 41 is installed on the tripod 4. One end of the metal tube 41 is connected to the exhaust end of the vacuum pump 332 at the corresponding position, and the other end is installed with a high-pressure gas nozzle 42, and the high-pressure gas nozzle 42 is in a straight line shape.

[0029] A marking mechanism 5 is installed on the second turning frame 27. The marking mechanism 5 is used to mark the position of the steel bar, including a slide rail 51 installed on the second turning frame 27, a slider 52 is slidably provided on the slide rail 51, an inverted paint bucket 53 is installed through the slider 52, the paint bucket 53 contains peelable paint mixed with fluorescent agent, and a nozzle 54 is provided on the top of the paint bucket 53. An electromagnet 55 is installed on one side of the slide rail 51, a metal plate 56 is fixed on one side of the slider 52, and also includes a pressure member 57 installed on one of the vacuum pumps 332 on the corresponding side.

[0030] The pressurizing member 57 includes a pressurizing tube 571, one end of which is connected to the bottom end of the paint bucket 53, and the other end is provided with a transfer box 572. The transfer box 572 is connected to the exhaust end of the vacuum pump 332 on one side of the second flip frame 27 through a pipeline. The transfer box 572 is respectively provided with a third electrically controlled valve 573 and a fourth electrically controlled valve 574. The switching states of the third electrically controlled valve 573 and the fourth electrically controlled valve 574 are opposite, and the third electrically controlled valve 573 is located at the position where the pressurizing tube 571 and the transfer box 572 are connected.

[0031] A detection method, comprising the above-mentioned device for detecting the thickness of the steel bar protective layer of a high-rise floor slab, further comprising the following steps: S1: The staff fixes the scanner body 1 to the support frame 2 by engaging the blocks 21 and buckles 22 on both sides of the support frame 2. The staff unfolds the first flip frame 26 and the second flip frame 27, and rotates them via the first rotating shaft 24 and the second rotating shaft 25 to a working position parallel to the wall to be measured. The entire device is moved to the wall of a high-rise floor, with the first flip frame 26 located in the front position in the direction of travel, and the elastic sleeves 331 of the two sets of travel mechanisms 3 are initially in contact with the wall. S2: Start the vacuum pump 332 to evacuate air from the chamber in the elastic sleeve 331 that is about to contact the wall through the air box 333 and the air pipe 334. At the same time, open the second electrically controlled valve 337 of the corresponding chamber, open the corresponding first electrically controlled valve 336, and close the other first electrically controlled valves 336 and second electrically controlled valves 337, so that the chamber generates negative pressure and is adsorbed to the wall. Start the servo motor 322 to drive the transmission wheel 321 to rotate, and drive the device to move along the wall via the crawler 323. S3: The scanner body 1 continuously transmits detection signals during movement, receives reflected signals from the steel bars inside the concrete, processes the signal data in real time, and determines the position of the steel bars and the thickness of the protective layer; S4: The compressed air discharged from the vacuum pump 332 is transported to the high-pressure air nozzle 42 through the metal pipe 41, and a high-speed airflow is ejected to remove the dust on the path to be scanned; S5: When the scanner detects that the position of the steel bar needs to be marked, the marking mechanism 5 is triggered to act, the fourth electrically controlled valve 574 is closed, and the third electrically controlled valve 573 is opened, so that the compressed air discharged from the vacuum pump 332 enters the paint bucket 53 through the transfer box 572 and the pressurized pipe 571, and pressurizes the paint bucket 53. The forward movement of the equipment can draw a longitudinal straight line, and the electromagnet 55 attracts or repels the metal plate 56, driving the slider 52 and the paint bucket 53 to slide along the slide rail 51, and a horizontal straight line can be drawn. Through two mutually perpendicular straight lines, the position to be marked can be accurately marked.

[0032] In step S4 , the high-speed airflow ejected from the high-pressure air nozzle 42 is in a straight line shape and covers an area whose width is greater than the width of the crawler belt 323 .

[0033] Working principle: After the staff has adjusted the detection parameters of the scanner body 1, the scanner body 1 is fixed by the blocks 21 and buckles 22 on both sides of the support frame 2, and the first flip frame 26 and the second flip frame 27 are unfolded to the working position, so that the elastic sleeve 331 is initially in contact with the wall, and then the vacuum pump 332 is started. The second electrically controlled valve 337 of the chamber where the elastic sleeve 331 contacts the wall and the corresponding first electrically controlled valve 336 in the air box 333 are opened. As the vacuum pump 332 extracts the gas in the air box 333, the air box 333 draws air into the chamber in contact with the wall through the air pipe 334, forming negative pressure adsorption. As the equipment moves, the switch states of the first electrically controlled valve 336 and the second electrically controlled valve 337 at different positions change accordingly. This operation can be achieved by those skilled in the art through sensors and simple programming. It is a prior art. At the same time, the servo motor 322 is turned on, driving the transmission wheel 321 to move the crawler 323. The scanner body 1 continuously emits detection signals and receives the reflection data of the steel bars, calculating the thickness of the protective layer in real time. The high-pressure air nozzle 42 at the exhaust end of the vacuum pump 332 ejects a straight-line high-speed airflow to clear the dust in front of the crawler 323. When the steel bar to be marked is detected, the marking mechanism 5 is triggered: the fourth electrically controlled valve 574 is closed and the third electrically controlled valve 573 is opened. Compressed air is injected into the paint bucket 53 through the transfer box 572 and the pressure pipe 571 for pressurization. As the equipment moves, the nozzle 54 draws a vertical line. When it moves to the location to be marked, the electromagnet 55 attracts / repulses the metal plate 56, driving the slider 52 to slide horizontally, drawing a vertical line, and then resets. It should be noted that the reset of the slider 52 can be solved by various conventional means in the prior art, such as adding a spring to one side of the slide rail 51 or increasing the friction force on the slider 52 when it is in the initial position (adding resistance to the middle position of the slide rail 51 and the corresponding portion of the slider 52 in the initial position). Ultimately, a cross coordinate is formed, and the marking is completed.

[0034] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0035] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A device for detecting the thickness of the protective layer of steel bars on a high-rise floor, comprising a scanner body (1), characterized in that: Also includes: A support frame (2), the support frame (2) being mounted on the scanner body (1), and having blocks (21) provided on both sides of the support frame (2), a buckle (22) being mounted on the support frame (2), and the buckle (22) and the block (21) cooperating with each other to fix the scanner body (1) on the support frame (2); The hanging ears (23) are provided in two groups and are respectively arranged on both sides of the support frame (2); the first turning frame (26) and the second turning frame (27) are respectively installed on the two groups of hanging ears (23) through the first rotating shaft (24) and the second rotating shaft (25); A moving mechanism (3) is provided. The moving mechanism (3) has two groups, each group having two members, which are respectively arranged on both sides of the first flip frame (26) and the second flip frame (27). The moving mechanism (3) drives the scanner body (1) fixed by the support frame (2) to move. When the scanner body (1) is located on a wall, the support frame (2) is adsorbed on the wall by negative pressure while the scanner body (1) moves.

2. The device for detecting the thickness of the steel bar protective layer of a high-rise floor slab according to claim 1, characterized in that: The traveling mechanism (3) is composed of three parts: a support member (31), a traveling member (32), and an adsorption member (33). The support member (31) is connected to the first flip frame (26) and the second flip frame (27). The traveling member (32) is used to drive the entire device to move. The adsorption member (33) generates negative pressure between the traveling member (32) and the wall. The support member (31) includes support plates (311) respectively installed on both sides of the first flip frame (26) and the second flip frame (27). A support shaft (312) is installed through the support plate (311). There are several support shafts (312).

3. The device for detecting the thickness of the steel bar protective layer of a high-rise floor slab according to claim 2, characterized in that: The traveling member (32) includes a transmission wheel (321) sleeved on a support shaft (312), wherein a servo motor (322) is mounted on one of the support shafts (312), and a crawler belt (323) is sleeved on the periphery of the transmission wheel (321), and the crawler belt (323) connects all the transmission wheels (321).

4. The device for detecting the thickness of the steel bar protective layer of a high-rise floor slab according to claim 3 is characterized in that: The adsorption member (33) includes an elastic sleeve (331) sleeved on the periphery of the crawler (323), the elastic sleeve (331) is evenly divided into a plurality of chambers, a vacuum pump (332) is installed on the support plate (311), the air extraction end of the vacuum pump (332) is sleeved with an air box (333) through a sealing bearing, and the air box (333) is connected to an air pipe (334), the number of the air pipes (334) is equal to the number of chambers in the elastic sleeve (331), and one end away from the air box (333) is respectively connected to one of the chambers in the elastic sleeve (331). A sealing ring (335) is installed in the air box (333), and a first electrically controlled valve (336) is provided on the sealing ring (335). The number of the first electrically controlled valves (336) is equal to the number of the air pipes (334), and the connection positions of the first electrically controlled valves (336) and the air pipes (334) and the air box (333) correspond one to one. A second electrically controlled valve (337) is installed on the elastic sleeve (331), and the number of the second electrically controlled valves (337) is equal to the number of chambers in the elastic sleeve (331), and the second electrically controlled valves (337) are respectively provided on one of the chambers, and are located on the side away from the track (323).

5. The device for detecting the thickness of the steel bar protective layer of a high-rise floor slab according to claim 4, characterized in that: The elastic sleeve (331) is made of aviation cloth and has a thickness of 0.2-0.5 mm.

6. The device for detecting the thickness of the steel bar protective layer of a high-rise floor slab according to claim 5, characterized in that: A tripod (4) is mounted on the support plates (311) located on both sides of the first flip frame (26). A metal tube (41) is mounted on the tripod (4). One end of the metal tube (41) is connected to the exhaust end of the vacuum pump (332) at the corresponding position, and the other end is mounted with a high-pressure gas nozzle (42). The high-pressure gas nozzle (42) is in a straight line shape.

7. The device for detecting the thickness of the steel bar protective layer of a high-rise floor slab according to claim 6, characterized in that: The second turning frame (27) is provided with a marking mechanism (5), which is used to mark the position of the steel bar, and includes a slide rail (51) installed on the second turning frame (27), a slider (52) slidingly provided on the slide rail (51), an inverted paint bucket (53) passing through the slider (52), the paint bucket (53) containing a strippable paint mixed with a fluorescent agent, and a nozzle (54) provided at the top of the paint bucket (53), an electromagnet (55) installed on one side of the slide rail (51), a metal plate (56) fixed on one side of the slider (52), and a pressure member (57) installed on one of the vacuum pumps (332) on the corresponding side.

8. The device for detecting the thickness of the steel bar protective layer of a high-rise floor slab according to claim 7, characterized in that: The pressurizing member (57) includes a pressurizing tube (571), one end of which is connected to the bottom end of the paint bucket (53), and the other end of which is provided with a transfer box (572). The transfer box (572) is connected to the exhaust end of the vacuum pump (332) on one side of the second flip frame (27) through a pipeline. The transfer box (572) is respectively provided with a third electrically controlled valve (573) and a fourth electrically controlled valve (574). The switching states of the third electrically controlled valve (573) and the fourth electrically controlled valve (574) are opposite, and the third electrically controlled valve (573) is located at the position where the pressurizing tube (571) and the transfer box (572) are connected.

9. A detection method, applicable to the device for detecting the thickness of the protective layer of steel bars on a high-rise floor as claimed in claim 8, characterized in that: The following steps are also included: S1: The staff fixes the scanner body (1) on the support frame (2) by cooperating the blocks (21) and the buckles (22) on both sides of the support frame (2), unfolds the first flip frame (26) and the second flip frame (27), and rotates them to a working position parallel to the wall to be measured through the first rotating shaft (24) and the second rotating shaft (25), and moves the entire device to the wall of the high-rise floor, with the first flip frame (26) located in the front position in the direction of travel, and makes the elastic sleeves (331) of the two sets of travel mechanisms (3) initially fit the wall; S2: Start the vacuum pump (332) to evacuate air from the chamber in the elastic sleeve (331) that is about to contact the wall through the air box (333) and the air pipe (334), and at the same time open the second electric control valve (337) of the corresponding chamber, open the corresponding first electric control valve (336), and close the other first electric control valves (336) and second electric control valves (337), so that the chamber generates negative pressure and is adsorbed on the wall, start the servo motor (322) to drive the transmission wheel (321) to rotate, and drive the device to move along the wall through the crawler (323); S3: The scanner body (1) continuously transmits detection signals during movement, receives reflected signals from the steel bars inside the concrete, processes the signal data in real time, and determines the position of the steel bars and the thickness of the protective layer; S4: The compressed air discharged from the vacuum pump (332) is transported to the high-pressure air nozzle (42) through the metal pipe (41), and a high-speed air flow is ejected to remove the dust on the path to be scanned; S5: When the scanner detects that the position of the steel bar needs to be marked, the marking mechanism (5) is triggered to operate, the fourth electric control valve (574) is closed, and the third electric control valve (573) is opened, so that the compressed air discharged from the vacuum pump (332) enters the paint bucket (53) through the transfer box (572) and the pressure pipe (571), pressurizing the paint bucket (53). The forward movement of the device can draw a longitudinal straight line, and the electromagnet (55) attracts or repels the metal plate (56), driving the slider (52) and the paint bucket (53) to slide along the slide rail (51), and can draw a transverse straight line. Through two mutually perpendicular straight lines, the position to be marked is accurately marked.

10. A detection method according to claim 9, characterized in that: In step S4, the high-speed airflow ejected from the high-pressure air nozzle (42) is in a straight line shape and covers an area with a width greater than the width of the crawler belt (323).

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