A method for detecting the thickness of a wall reinforcing layer

Abstract

This invention belongs to the field of rebar protective layer detection technology and discloses a method for detecting the thickness of the protective layer of wall rebar. It addresses the problems of low detection efficiency and poor detection accuracy when workers use a ladder and a handheld rebar scanner to detect the protective layer of rebar. The invention includes: (1) mounting a sliding rod on a second support seat; (2) inserting a slider from both ends of the sliding rod and securing the bottom guide rod to the sliding block, then locking the sliding block to the sliding rod on the first support seat; (3) adjusting the position of the slider on the sliding rod and connecting a reinforcing rod between the slider and the bottom guide rod; (4) inserting and securing the rebar scanner into the insertion part; (5) sequentially assembling several sections of the middle guide rod and one section of the top guide rod; and (6) starting the rebar scanner to detect the thickness of the rebar protective layer.

Description

Technical Field

[0001] This invention belongs to the field of steel reinforcement protective layer detection technology, specifically relating to a method for detecting the thickness of steel reinforcement protective layer in walls. Background Technology

[0002] During construction, reinforced concrete is poured to form a unified structure between the reinforcing steel reinforcement cage (such as the steel reinforcement cage within columns, walls, beams, and bridge piers). To protect the reinforcing steel and prevent (or reduce) corrosion, the thickness of the concrete cover between the outermost edge of the reinforcing steel and the outer surface of the concrete is subject to certain requirements; this is known as the concrete cover thickness. The table below shows the minimum thickness (mm) of the concrete cover:

[0003] Environmental Category Board, wall, shell Beams, columns, and poles one 15 20 Two a 20 25 2b 25 35 Three a 30 40 Three b 40 50

[0004] When the concrete strength is not greater than C25, the protective layer thickness values ​​in the table should be increased by 5mm; reinforced concrete foundations should preferably have a concrete cushion layer, and the concrete protective layer thickness of the reinforcing bars in the foundation should be measured from the top surface of the cushion layer and should not be less than 40mm. Therefore, those skilled in the art will understand the thickness of the reinforcing bar protective layer.

[0005] Currently, rebar scanners (such as those used in column and wall reinforcement bar cover thickness testing) are employed to measure the thickness of the protective layer of rebar in columns and walls. Figure 1 As shown in the figure, the inspection is carried out by the staff holding the rebar scanner and sliding it on the column and wall to detect the thickness of the rebar protective layer.

[0006] However, in actual operation, the height of columns and walls in ordinary buildings is generally 3 meters or more. Therefore, staff have to use escalators to operate. Since scanning requires detection along the entire height of the column and wall, and for the wall surface, multiple positions need to be scanned along the width of the wall, the staff's up-and-down movement of holding the rebar scanner on the escalator not only leads to low detection efficiency, but also inevitably causes hand swaying when climbing up and down the escalator (for example, the rebar scanner tilts, causing one end to contact the concrete surface while the other end does not), which in turn affects the detection accuracy.

[0007] In addition, the process of workers climbing up and down the escalator is not only physically demanding, but also poses certain safety hazards. Summary of the Invention

[0008] To address the issues of low detection efficiency and poor accuracy when workers use escalators and handheld rebar scanners to inspect the protective layer of rebar, this invention provides a method for detecting the thickness of the protective layer of wall rebar. This detection device can be used to detect the thickness of the protective layer of rebar without requiring workers to climb escalators, thus improving detection efficiency, significantly reducing the labor intensity of workers, and avoiding the safety hazards associated with climbing escalators.

[0009] To solve the technical problem, the technical solution adopted by this invention is as follows:

[0010] A method for detecting the thickness of the concrete cover for reinforcing steel bars in a wall, characterized in that it includes a detection device, and the detection method based on the detection device includes:

[0011] (1) At the construction site, the slide rod is fitted onto the second support seat on the base.

[0012] (2) Insert the slider into both ends of the slider rod respectively, and fasten the bottom guide rod to the slider block. Then lock the slider block to the slider rod on the first support seat.

[0013] (3) Adjust the position of the slider on the slide rod and connect the reinforcing rod between the slider and the bottom guide rod;

[0014] (4) A steel bar scanner can be inserted and stabilized on the plug-in part that can follow the up and down movement of the moving block.

[0015] (5) Several sections of middle guide rods and one section of top guide rod are sequentially spliced ​​on the bottom guide rod;

[0016] (6) Start the rebar scanner and make contact with the concrete surface of the wall. Then, let the sliding block and the sliding rod slide relative to each other. Push the sliding block to move on the sliding rod to detect the thickness of the rebar protective layer at the same height position. Start the drive motor to drive the rebar scanner to follow the moving block to move up and down on the screw, thereby realizing the detection of the thickness of the rebar protective layer at different height positions.

[0017] In some embodiments, when it is necessary to scan the base of the wall using a rebar scanner, the height position of the moving block on the lead screw is adjusted so that the rebar scanner on the insertion part can scan the base of the wall.

[0018] In some embodiments, when it is necessary to scan the top of the wall using a rebar scanner, firstly, the servo motor is controlled to drive the plug-in part to rotate 90°. The rebar scanner and the plug-in part rotate in the same way under their own weight. Then, the rebar scanner is pressed against the concrete surface of the wall again, and the height position of the moving block on the screw is adjusted so that the rebar scanner on the plug-in part can scan the top of the wall.

[0019] In some embodiments, when splicing the middle guide and top guide rods, if the height of the middle guide and top guide rods is higher than the height that the worker can splice, the base is tilted, and then the middle guide rod and top guide rod are spliced ​​in sequence. After the splicing of the top guide rod is completed, the base is flipped so that the spliced ​​guide rod is in a vertical state, and then the rebar scanner is brought into contact with the concrete surface of the wall for scanning.

[0020] The detection device of the present invention includes:

[0021] The base is used to support the entire testing device.

[0022] Two first support seats are arranged on the base along the width direction of the base. A sliding rod is provided on the first support seat, and a sliding block is provided on the sliding rod.

[0023] A spliced ​​guide rod, wherein the spliced ​​guide rod has a hollow structure, and a spliced ​​lead screw is sleeved inside the spliced ​​guide rod. A movable block that is threadedly connected to the lead screw is sleeved on the lead screw. A strip-shaped slit is opened on the side of the spliced ​​guide rod, and one end of the movable block extends out of the strip-shaped slit and connects to the insertion part for inserting the handle of the rebar scanner.

[0024] The drive motor is mounted on the sliding block and is used to drive the lead screw to rotate, thereby driving the moving block to move up and down on the lead screw.

[0025] In some embodiments, the longitudinal cross-section of the sliding rod is rectangular, T-shaped, or wedge-shaped, and the sliding block is provided with a sliding groove that is compatible with the sliding rod.

[0026] In some embodiments, the sliding block has at least two screw holes, each screw hole is equipped with a locking screw, and the position of the sliding block on the sliding rod is locked onto the sliding rod by the locking screw.

[0027] In some embodiments, the base is further provided with two second support seats, the distance between the second support seats is less than the distance between the two first support seats, and a sliding rod is sleeved on the two second support seats. Sliding blocks are sleeved on both the left and right ends of the sliding rod located outside the second support seats. The sliding blocks are detachably connected to a reinforcing rod, and the other end of the reinforcing rod is detachably connected to the outside of the spliced ​​guide rod.

[0028] In some embodiments, the spliced ​​guide rod includes a bottom guide rod, a middle guide rod, and a top guide rod. Bearings are installed at the bottom of the bottom guide rod and the top of the top guide rod, and a spliced ​​lead screw is sleeved inside the bearing.

[0029] In some embodiments, a rectangular mounting hole is formed in the sliding block along the vertical direction, and a mounting plate is provided on the lower periphery of the bottom guide rod. The bottom guide rod is inserted into the mounting hole and fastened to the sliding block by the mounting plate.

[0030] In some embodiments, a driven bevel gear is mounted on the bottom of the mounting hole via a bearing, a second mounting hole communicating with the mounting hole is provided on the side of the sliding block facing the second support seat, and a driving bevel gear is mounted on the output shaft of the drive motor, the driving bevel gear extending into the second mounting hole and meshing with the driven bevel gear.

[0031] In some embodiments, the movable block extending from the spliced ​​guide rod forms a mounting cavity, in which a servo motor and a bearing are installed. A rotating plate is sleeved on the bearing, one end of which is sleeved inside the bearing and fixedly connected to the output shaft of the servo motor. The plug-in portion is installed on the side of the rotating plate away from the spliced ​​guide rod.

[0032] In some embodiments, the plug portion is mounted on a rotating plate via a pin.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] The wall reinforcement protective layer thickness detection method of the present invention involves first inserting and securing the spliced ​​guide rod to the sliding block, and then inserting and securing the reinforcement scanner to the insertion part. A reinforcing rod is then used to connect the spliced ​​guide rod to the slider. The entire device is then pushed so that the reinforcement scanner on the insertion part contacts the concrete surface of the column or wall. The sliding block is then moved left and right on the sliding rod, causing the reinforcement scanner to move horizontally across the concrete surface, thus scanning different positions at the same height. When scanning at different heights is required, a drive motor is activated to rotate the lead screw, causing the moving block to move up and down on the lead screw, ultimately scanning the column or wall to obtain the reinforcement protective layer thickness information. When scanning the top of the column or wall, a servo motor is used to rotate the rotating plate 90°, while the insertion part itself can rotate on the rotating plate, keeping the vertical position of the reinforcement scanner unchanged. The rotating plate extends to scan the top of the column or wall. In actual operation, it is generally necessary to scan the width of 6 to 7 reinforcement bars at the same height. In use, after scanning at one height position, the invention uses a drive motor to move a moving block up and down on a lead screw to reach another height position for scanning. When scanning different areas of the wall, the entire device is moved to the next scanning area, and this cycle is repeated to complete the scanning and detection of the thickness of the reinforcing steel protective layer.

[0035] Since the height of the same floor is the same, the wall of the entire floor can be inspected after the entire assembly is completed in one go. Compared with the existing technology of using escalators for inspection, the efficiency of inspection is greatly improved.

[0036] Meanwhile, during the use of this invention, after the wall inspection of one floor is completed, the wall can be transported between different floors by using stairs or by removing the top guide rod and part of the middle guide rod. When arriving at the next floor for inspection, it is only necessary to install the removed top guide rod and middle guide rod to continue the inspection. It is not necessary to disassemble and reassemble for each inspection, which further improves the efficiency of the inspection.

[0037] Compared with existing technologies, this invention uses workers to climb escalators, which can improve the efficiency of protective layer thickness detection and avoid the problems of low detection accuracy and safety hazards caused by swaying during escalator climbing.

[0038] Furthermore, this invention employs a modular structure, which can be assembled according to the actual height during use. It can also be disassembled after use, facilitating handling and transportation. Attached Figure Description

[0039] Figure 1 This is a structural schematic diagram of an embodiment of an existing rebar scanner;

[0040] Figure 2 This is a schematic diagram of a structure according to an embodiment of the present invention;

[0041] Figure 3 This is a schematic diagram of the structure when the bottom guide rod of the present invention is spliced ​​onto the base;

[0042] Figure 4 for Figure 3 A magnified view of part A in the middle;

[0043] Figure 5 This is a schematic diagram of the sliding block of the present invention;

[0044] Figure 6 This is a schematic diagram showing the connection between the lead screw and the drive motor of the present invention;

[0045] Figure 7 This is a schematic diagram showing the connection between the moving block and the rotating plate of the present invention;

[0046] Figure 8 This is a schematic diagram of the connection between the spliced ​​guide rods of the present invention, showing the structure of the bottom guide rod and the middle guide rod being spliced ​​together.

[0047] The diagram shows the following markings: 1. Base, 2. First support seat, 3. Sliding rod, 4. Sliding block, 41. Sliding groove, 42. Mounting hole, 43. Second mounting hole, 44. Screw hole, 5. Interlocking guide rod, 51. Bottom guide rod, 52. Middle guide rod, 53. Top guide rod, 54. Strip slot, 55. Locking screw, 56. Mounting plate, 6. Second support seat, 7. Sliding rod, 8. Sliding block, 9. Reinforcing rod, 10. Drive motor, 101. Driving bevel gear, 102. Driven bevel gear, 11. Lead screw, 111. Female end, 12. Moving block, 121. Mounting cavity, 13. Servo motor, 15. Plug-in part, 151. Plug-in groove, 152. Locking screw hole. Detailed Implementation

[0048] The present invention will be further described below with reference to embodiments. These embodiments are merely some, not all, of the embodiments of the present invention. Other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are all within the protection scope of the present invention.

[0049] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "joined" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0050] Referring to the accompanying drawings, the wall reinforcement protective layer thickness detection method of the present invention includes a detection device, and the detection method based on the detection device includes:

[0051] (1) At the construction site, the slide rod is fitted onto the second support seat on the base.

[0052] (2) Insert the slider into both ends of the slider rod respectively, and fasten the bottom guide rod to the slider block. Then lock the slider block to the slider rod on the first support seat.

[0053] (3) Adjust the position of the slider on the slide rod and connect the reinforcing rod between the slider and the bottom guide rod;

[0054] (4) A steel bar scanner can be inserted and stabilized on the plug-in part that can follow the up and down movement of the moving block.

[0055] (5) Several sections of middle guide rods and one section of top guide rod are sequentially spliced ​​on the bottom guide rod;

[0056] (6) Start the rebar scanner and make contact with the concrete surface of the wall. Then, let the sliding block and the sliding rod slide relative to each other. Push the sliding block to move on the sliding rod to detect the thickness of the rebar protective layer at the same height position. Start the drive motor to drive the rebar scanner to follow the moving block to move up and down on the screw, thereby realizing the detection of the thickness of the rebar protective layer at different height positions.

[0057] In some embodiments, when it is necessary to scan the base of the wall using a rebar scanner, the height position of the moving block on the lead screw is adjusted so that the rebar scanner on the insertion part can scan the base of the wall.

[0058] In some embodiments, when it is necessary to scan the top of the wall using a rebar scanner, firstly, the servo motor is controlled to drive the plug-in part to rotate 90°. The rebar scanner and the plug-in part rotate in the same way under their own weight. Then, the rebar scanner is pressed against the concrete surface of the wall again, and the height position of the moving block on the screw is adjusted so that the rebar scanner on the plug-in part can scan the top of the wall.

[0059] In some embodiments, when splicing the middle guide and top guide rods, if the height of the middle guide and top guide rods is higher than the height that the worker can splice, the base is tilted, and then the middle guide rod and top guide rod are spliced ​​in sequence. After the splicing of the top guide rod is completed, the base is flipped so that the spliced ​​guide rod is in a vertical state, and then the rebar scanner is brought into contact with the concrete surface of the wall for scanning.

[0060] The detection device of the present invention includes:

[0061] Base 1 is used to support the entire testing device;

[0062] Two first support seats 2 are arranged on the base 1 along the width direction of the base 1. A sliding rod 3 is provided on the first support seat 2, and a sliding block 4 is provided on the sliding rod 3.

[0063] The spliced ​​guide rod 5 has a hollow structure, and a spliced ​​lead screw 11 is sleeved inside the spliced ​​guide rod 5. A movable block 12 that is threadedly connected to the lead screw 11 is sleeved on the lead screw 11. A strip-shaped slit 54 is opened on the side of the spliced ​​guide rod 5. One end of the movable block 12 extends out of the strip-shaped slit 54 and connects to the insertion part 15 for inserting the handle of the rebar scanner.

[0064] The drive motor 10 is mounted on the sliding block 4 and is used to drive the lead screw 11 to rotate, thereby driving the moving block 12 to move up and down on the lead screw 11.

[0065] In the specific implementation process, the lower end of the base 1 is equipped with casters to facilitate transportation; at the same time, there are adjusting screws at the four corners of the base, the lower end of the adjusting screws passes through the base and is connected to the support plate, so as to adjust the position of the support plate by adjusting the adjusting screws, and at the same time use the support plate to stabilize the entire device on the ground.

[0066] In some embodiments, the longitudinal section of the sliding rod 3 is rectangular, T-shaped, or wedge-shaped, and the sliding block 4 has a sliding groove 41 that matches the sliding rod 3. This allows the rectangular, T-shaped, or wedge-shaped sliding rod 3 to directly position the sliding block 4, preventing rotation of the sliding block 4 on the sliding rod 3. In a specific implementation, the first support base 2 also has a sliding groove that matches the sliding rod 3.

[0067] In some embodiments, the sliding block 4 is provided with at least two screw holes 44, and the screw holes 44 are equipped with locking screws. The position of the sliding block 4 on the sliding rod 3 is locked on the sliding rod 3 by the locking screws.

[0068] In some embodiments, the base is further provided with two second support seats 6, the distance between the second support seats 6 being smaller than the distance between the two first support seats 2. Slide rods 7 are fitted onto the two second support seats 6, and sliders 8 are fitted onto both ends of the slide rods 7 located outside the second support seats 6. Each slider 8 is detachably connected to a reinforcing rod 9, the other end of which is detachably connected to the outside of the spliced ​​guide rod 5. That is, the reinforcing rod 9 is used to stabilize the spliced ​​guide rod 5, improving its stability and preventing tilting and collapse. Furthermore, the structural design of the slide rod and sliders ensures that when the sliding block 4 slides on the sliding rod 3, the reinforcing rod 9 can also drive the slider 8 to slide on the slide rod 7. Therefore, regardless of the left or right position of the sliding block 4 on the sliding rod 3, the reinforcing rod 9 and the slider 8 can move synchronously, thereby ensuring the stability of the spliced ​​guide rod 5.

[0069] When the sliding block 4 is fastened to the sliding rod 3 by the fastening bolt, there will be no relative movement between the slider 8 and the sliding rod 7. Therefore, there is no specific restriction on the cross-sectional shape of the sliding rod 7. Circular, rectangular, wedge-shaped, and T-shaped sliding rods are all acceptable.

[0070] In some embodiments, a linear motor is also arranged on the base 1. The linear motor drives the sliding block 4 to move on the sliding rod 3, thereby driving the rebar scanner installed on the moving block to move left and right to scan, thereby obtaining the thickness information of the rebar protective layer.

[0071] In some embodiments, the spliced ​​guide rod 5 includes a bottom guide rod 51, a middle guide rod 52, and a top guide rod 53. Bearings are installed at the bottom of the bottom guide rod 51 and the top of the top guide rod 52, and a spliced ​​lead screw 11 is sleeved inside the bearing. In a specific implementation, the bottom guide rod 51 (with a lead screw sleeved inside via a bearing) is first fastened to the sliding block 4. Then, the middle guide rod 52 is spliced ​​section by section. Finally, the top guide rod 52 (with a lead screw sleeved inside via a bearing) is spliced ​​on to complete the splicing of the entire spliced ​​guide rod 5. When splicing the middle guide rod, the inner lead screw is spliced ​​first, and then the outer guide rod is spliced.

[0072] In the specific implementation process, the spliced ​​guide rods 5 are connected by a male and female fitting method, and then locked together using locking screws 55 and matching locking nuts, thereby firmly connecting adjacent spliced ​​guide rods 5 together. The locking screw 55 should be positioned so as not to obstruct or hinder the lead screw 11 and the moving block 12. In the specific implementation process, the locking screw is arranged parallel to the strip seam on the spliced ​​guide rods 5 outside the lead screw and the moving block.

[0073] Since the rebar scanner itself is relatively lightweight (not exceeding 2 kg), the strength requirement for the lead screw 11 is not very high. Therefore, to reduce manufacturing costs, the lead screw 11 and the moving block 12 can be made of plastic, while the spliced ​​guide rod can be made of aluminum alloy, thereby reducing the weight of the entire device and facilitating handling.

[0074] In some embodiments, the sliding block 4 has a rectangular mounting hole 42 formed vertically in the sliding block 4, and a mounting plate 56 is provided around the lower section of the bottom guide rod 51. The bottom guide rod 51 is inserted into the mounting hole 42 and fastened to the sliding block 4 by the mounting plate 56. The mounting plate 56 has several through holes, and the sliding block around the mounting hole 42 has threaded holes. The mounting plate 56 is threadedly connected to the sliding block 4 by a screw.

[0075] In some embodiments, a driven bevel gear 102 is mounted on the bottom of the mounting hole 42 via a bearing. A second mounting hole 43, communicating with the mounting hole 42, is provided on the side of the sliding block 4 facing the second support 6. A driving bevel gear 101 is mounted on the output shaft of the drive motor 10, extending into the second mounting hole 43 and meshing with the driven bevel gear 102. In specific implementations, the purpose of mounting the drive motor on the sliding block facing the second support is to both drive the lead screw to rotate through the meshing of the driving and driven bevel gears and to utilize the weight of the drive motor to counterbalance the entire device, ensuring its stability during use.

[0076] In the specific implementation process, the lower section of the lead screw 11 inside the bottom guide rod 51 has a rectangular male end, and the male end extends out of the bottom guide rod 51. The middle part of the driven bevel gear 102 has a slot that matches the male end. So when the male end inside the bottom guide rod 51 is inserted into the slot of the driven bevel gear 102, the driven bevel gear 102 can drive the lead screw 11 to rotate, thereby driving the moving block 12 to move up and down. The lead screw is also composed of a spliced ​​structure, and adjacent lead screws are connected to each other by male and female ends 111.

[0077] There should be no mechanical interference between the sliding groove on the sliding block 4 and the driving bevel gear 101 and the driven bevel gear 102. This is something that those skilled in the art can understand and comprehend, and will not be elaborated further here.

[0078] Preferably, the female end 111 of the lead screw 11 is provided with a locking pin hole, and the male end is provided with an elastic locking pin, thereby improving the stability of the connection between adjacent lead screws 11.

[0079] In some embodiments, the movable block 12 extending from the spliced ​​guide rod 5 forms a mounting cavity 121, in which a servo motor 13 and a bearing are installed. A rotating plate 14 is sleeved on the bearing, with one end of the rotating plate 14 sleeved inside the bearing and fixedly connected to the output shaft of the servo motor 13. The insertion part 15 is installed on the rotating plate 14 on the side away from the spliced ​​guide rod 5. A small servo motor can be used for the servo motor 13, as the movable block, rotating plate, insertion part, and the rebar scanner itself are relatively lightweight, thus a small servo motor is sufficient to drive the rotating plate to rotate.

[0080] The movable block has a wire hole for threading the wires of the servo motor 13. To prevent the wires of the servo motor 13 from getting tangled during use, the wires are led out of the movable block 12 and secured to the splicing guide rod 5 by a clip.

[0081] This invention utilizes an "L"-shaped rotating plate to eliminate the height limitations imposed by the base, first support, and sliding block. The rotating plate extends downwards to allow for scanning of the base of columns and walls using a rebar scanner. When scanning the top of columns or walls is required, a servo motor drives the rotating plate to rotate.

[0082] In some embodiments, the insertion part 15 is mounted on the rotating plate 14 by a pin. This ensures that when the rotating plate rotates, the rebar scanner maintains a vertical position under its own weight and does not flip over.

[0083] The length of the rotating plate 14 can be set according to actual conditions so that the rebar scanner on the insertion part 15 can scan the base of the column and wall. That is to say, when the moving block is at the lowest position on the lead screw, the rebar scanner on the insertion part 15 can scan the base of the column and wall.

[0084] In the specific implementation process, the plug part 15 has a plug groove 151 that matches the handle of the existing rebar scanner, so that the handle can be directly plugged into the plug groove 151. The plug part 15 also has at least two locking screw holes 152, and the locking screw holes 152 are equipped with locking screws, so that the handle of the rebar scanner is secured to the plug part 15 by means of the locking screw mechanism.

[0085] In use, the rebar protective layer thickness detection device of the present invention first inserts and secures the spliced ​​guide rod to the sliding block, and then inserts and secures the rebar scanner to the insertion part. A reinforcing rod connects the spliced ​​guide rod to the slider. The entire device is then pushed so that the rebar scanner on the insertion part contacts the concrete surface of the column or wall. The sliding block is then moved left and right on the sliding rod, causing the rebar scanner to move horizontally across the concrete surface, scanning different positions at the same height. When scanning at different heights is required, the drive motor is activated to rotate the lead screw, causing the moving block to move up and down on the lead screw, ultimately scanning the column or wall to obtain the rebar protective layer thickness information. When scanning the top of the column or wall is required, a servo motor first rotates the rotating plate 90°, while the insertion part itself can rotate on the rotating plate, keeping the vertical position of the rebar scanner unchanged. The rotating plate extends to scan the top of the column or wall. In actual operation, it is generally necessary to scan the width of 6 to 7 rebars at the same height. In use, after scanning at one height position, the invention uses a drive motor to move a moving block up and down on a lead screw to reach another height position for scanning. When scanning different areas of the wall, the entire device is moved to the next scanning area, and this cycle is repeated to complete the scanning and detection of the thickness of the reinforcing steel protective layer.

[0086] Since the height of the same floor is the same, the wall of the entire floor can be inspected after the entire assembly is completed in one go. Compared with the existing technology of using escalators for inspection, the efficiency of inspection is greatly improved.

[0087] Meanwhile, during the use of this invention, after the wall inspection of one floor is completed, the wall can be transported between different floors by using stairs or by removing the top guide rod and part of the middle guide rod. When arriving at the next floor for inspection, it is only necessary to install the removed top guide rod and middle guide rod to continue the inspection. It is not necessary to disassemble and reassemble for each inspection, which further improves the efficiency of the inspection.

[0088] Compared with existing technologies, this invention uses workers to climb escalators, which can improve the efficiency of protective layer thickness detection and avoid the problems of low detection accuracy and safety hazards caused by swaying during escalator climbing.

[0089] Furthermore, this invention employs a modular structure, which can be assembled according to the actual height during use. It can also be disassembled after use, facilitating handling and transportation.

Claims

1. A method for detecting the thickness of the concrete cover for reinforcing steel bars in a wall, characterized in that, The detection device includes a detection method based on the detection device, which includes: (1) At the construction site, the sliding rod is fitted onto the second support seat on the base. (2) Insert the slider into both ends of the slider rod respectively, and fasten the bottom guide rod to the slider block. Then lock the slider block to the slider rod on the first support seat. (3) Adjust the position of the slider on the slide rod and connect the reinforcing rod between the slider and the bottom guide rod; (4) Insert and stabilize the steel bar scanner on the plug part that can follow the up and down movement of the moving block; (5) Several middle guide rods and one top guide rod are sequentially spliced ​​on the bottom guide rod; the moving block extending from the spliced ​​guide rod forms an installation cavity, in which a servo motor and a bearing are installed, and a rotating plate is sleeved on the bearing. One end of the rotating plate is sleeved in the bearing and fixedly connected to the output shaft of the servo motor. The plug-in part is installed on the side of the rotating plate away from the spliced ​​guide rod; the plug-in part is installed on the rotating plate by a pin, so that when the rotating plate rotates, the rebar scanner always maintains a vertical state under its own weight and will not flip over. (6) Start the rebar scanner and make contact with the concrete surface of the wall. Then, let the sliding block and the sliding rod slide relative to each other. Push the sliding block to move on the sliding rod to detect the thickness of the rebar protective layer at the same height position. Start the drive motor to drive the rebar scanner to follow the moving block to move up and down on the screw, thereby realizing the detection of the thickness of the rebar protective layer at different height positions. When it is necessary to use a rebar scanner to scan the base of the wall, adjust the height of the moving block on the lead screw so that the rebar scanner on the plug part can scan the base of the wall. When it is necessary to use a rebar scanner to scan the top of the wall, first control the servo motor to drive the plug part to rotate 90°. The rebar scanner and the plug part rotate in the same way under their own weight. Then, the rebar scanner is pressed against the concrete surface of the wall again, and the height position of the moving block on the screw is adjusted so that the rebar scanner on the plug part can scan the top of the wall.

2. The method for detecting the thickness of the concrete cover for reinforcing steel bars in a wall according to claim 1, characterized in that, When splicing the middle guide and top guide rods, if the height of the middle guide and top guide rods is higher than the height that the workers can splice, the base is tilted over, and then the middle guide rod and top guide rod are spliced ​​in sequence. After the top guide rod is spliced, the base is flipped over so that the spliced ​​guide rod is in a vertical state, and then the rebar scanner is brought into contact with the concrete surface of the wall for scanning.

3. The method for detecting the thickness of the concrete cover for reinforcing steel bars in a wall according to claim 1 or 2, characterized in that, The detection device includes a base for supporting the entire device; two first support seats arranged along the width of the base, each with a sliding rod and a sliding block; a spliced ​​guide rod, which is hollow and has a spliced ​​lead screw inside, with a movable block threadedly connected to the lead screw; a strip-shaped slit on the side of the spliced ​​guide rod, with one end of the movable block extending out of the slit and connecting to a connector for inserting a handle of a rebar scanner; and a drive motor mounted on the sliding block to rotate the lead screw and thus move the movable block up and down on the lead screw.

4. The method for detecting the thickness of the concrete cover for reinforcing steel bars in a wall according to claim 3, characterized in that, The base is also provided with two second support seats. The distance between the second support seats is smaller than the distance between the two first support seats. A sliding rod is sleeved on the two second support seats. Sliding blocks are sleeved on both the left and right ends of the sliding rod located outside the second support seats. The sliding blocks are detachably connected to a reinforcing rod. The other end of the reinforcing rod is detachably connected to the outside of the spliced ​​guide rod.

5. The method for detecting the thickness of the concrete cover for reinforcing steel bars in a wall according to claim 4, characterized in that, The sliding block has a rectangular mounting hole along the vertical direction. The lower section of the bottom guide rod is provided with a mounting plate. The bottom guide rod is inserted into the mounting hole and fastened to the sliding block by the mounting plate.

6. The method for detecting the thickness of the concrete cover for reinforcing steel bars in a wall according to claim 5, characterized in that, A driven bevel gear is mounted on the bottom of the mounting hole via a bearing. A second mounting hole, which communicates with the mounting hole, is opened on the side of the sliding block facing the second support. An active bevel gear is mounted on the output shaft of the drive motor. The active bevel gear extends into the second mounting hole and meshes with the driven bevel gear.

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