A thickness detector for the steel bar protective layer of a bridge pier column

Abstract

The present invention discloses a thickness detector for the steel bar protective layer of a bridge pier column, belonging to the technical field of thickness detection of the steel bar protective layer of a bridge pier column. It includes a housing and a rope winding assembly arranged inside it. The rope winding assembly includes a rope winding shaft connected to the inside of the housing by bearings, and steel wire ropes are wound around both the upper and lower parts of the rope winding shaft. The tail ends of the steel wire ropes are fixedly connected to the rope winding shaft. A first wire rope guiding wheel group for guiding the steel wire ropes is installed inside the housing, and the first wire rope guiding wheel group and the steel wire ropes are arranged in one-to-one correspondence. The invention can not only be stably installed on the round-cornered rectangular columnar bridge pier column, but also be stably installed on the cylindrical bridge pier column, thereby facilitating stable detection operations. In addition, during the process of grinding the steel bar protective layer, it can ensure that the brushing and grinding roller effectively and stably presses the bridge pier column, facilitating uniform and rapid grinding of the protective layer, and helping to improve the detection efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of detecting the thickness of the steel bar protection layer of bridge piers, and specifically to a thickness detector for the steel bar protection layer of bridge piers. Background Art

[0002] In bridge construction projects, bridge piers, as important supporting components of bridge structures, their quality and safety are directly related to the service life and operation safety of the entire bridge. The steel bar protection layer plays a crucial role in the bridge pier structure;

[0003] The steel bar protection layer refers to the concrete layer from the outer edge of the steel bar to the surface of the component in a concrete structure. Its main function is to protect the steel bar from being eroded by external environmental factors such as oxygen, moisture, and chemical substances. When the steel bar is exposed to these corrosive environments, it is prone to rust, resulting in a reduction in the cross-sectional area of the steel bar and a decrease in mechanical properties, thereby affecting the bearing capacity and durability of the pier. At the same time, an appropriate thickness of the steel bar protection layer can ensure the effective bonding between the steel bar and the concrete, enabling the two to work together and improving the overall performance of the structure;

[0004] Currently, when the existing thickness detectors for the steel bar protection layer of bridge piers detect the thickness of the steel bar protection layer, the body needs to be clamped and fixed on the bridge pier. Since not all bridge piers are round-cornered rectangular columns, there are also cylinders. Therefore, when the body is clamped, the stability is poor, and during the process of grinding the protection layer, it is easy to cause the body to separate from the pier, further increasing the instability of the clamping. Specifically, as follows:

[0005] The publication number CN216049582U discloses a detection tool for the steel bar protection layer of bridge piers, which realizes the mutual approach of two clamping plates through the cooperation of gears and racks, so as to clamp the tool on the bridge pier. If the bridge pier is a round-cornered rectangular column, the clamping may be relatively stable. However, if the bridge pier is a cylinder, the contact area between the clamping plate and the bridge pier will decrease sharply, resulting in unstable clamping and the tool being easily detached from the bridge pier;

[0006] In addition, during the process of grinding the protection layer, the installation shell needs to be repeatedly moved. The force applied to the installation shell will act on the clamping plate, making the clamping plate unable to stably clamp the bridge pier. In addition, during the process of repeatedly moving the installation shell, vibrations will be generated, which will further cause the clamping plate to loosen from the bridge pier;

[0007] During the above process of repeatedly moving the installation shell, since it will cause the clamping plate to gradually loosen from the bridge pier, it will further cause the brushing roller to be unable to stably press the bridge pier, and thus unable to evenly and smoothly quickly grind the protection layer, which is not conducive to improving the detection efficiency;

[0008] Therefore, a thickness detector for the steel bar protective layer of bridge piers is needed to solve the above problems. Summary of the Invention

[0009] The purpose of the present invention is to provide a thickness detector for the steel bar protective layer of bridge piers, so as to solve the problems in the above-mentioned background technology that the existing thickness detector for the steel bar protective layer of bridge piers cannot be stably clamped on bridge piers of different shapes, and cannot ensure that the steel bar protective layer is stably, evenly and quickly ground off.

[0010] To achieve the above purpose, the present invention provides the following technical solutions:

[0011] A thickness detector for the steel bar protective layer of bridge piers includes a housing and a rope winding assembly arranged inside it. The rope winding assembly includes a rope winding shaft, which is connected to the inside of the housing by bearings. Steel wire ropes are wound around both the upper and lower parts of the rope winding shaft. The tail ends of the steel wire ropes are fixedly connected to the rope winding shaft. A first wire rope guiding wheel set for guiding the steel wire ropes is installed inside the housing, and the first wire rope guiding wheel set and the steel wire ropes are arranged in one-to-one correspondence. The head end of the steel wire rope extends out of the right side of the housing movably after being guided by the first wire rope guiding wheel set, and the head end of the steel wire rope is fixedly connected with a connecting block. A female connection assembly is arranged on the left side of the housing, and a male connection assembly is arranged on the connecting block for connecting with the female connection assembly. Anti-slip convex points for anti-slip are evenly arranged on the back side of the housing. The steel wire rope penetrates through a brush grinding assembly, and the brush grinding assembly includes a brush grinding roller for grinding off the steel bar protective layer.

[0012] Preferably, the rope winding assembly further includes locking members that movably penetrate through the housing. The locking members are arranged on both the upper and lower sides of the housing. The locking member includes a large disc body and a cylindrical structure coaxially arranged with it, and the two form a T-shaped structure. The cylindrical structure movably penetrates through the housing. The locking member further includes rod structures evenly distributed on the large disc body, and the rod structures also movably penetrate through the housing to limit the locking member to prevent it from rotating. The cylindrical structure on the locking member movably extends into the inside of the rope winding shaft, and the outside of the cylindrical structure on the locking member is connected to the inside of the rope winding shaft through a ratchet and pawl limiting structure for limiting the rotation direction of the rope winding shaft. The locking member further includes a small disc body coaxially and fixedly connected to one end of the cylinder extending into the rope winding shaft, and the two small disc bodies are connected by a second spring. The outside of the middle part of the rope winding shaft is connected to the inside of the housing through a torsion spring for automatically resetting the rope winding shaft.

[0013] Preferably, the middle part of the rope winding shaft is in the shape of an I-shaped disc structure, which is convenient for the installation of the torsion spring and for separating the steel wire ropes on the upper and lower parts of the rope winding shaft to avoid cross-winding.

[0014] Preferably, the female connection assembly includes an embedding groove provided on the left side of the housing, and two clamping grooves are symmetrically arranged inside the embedding groove. On the inner side of the opening end of each clamping groove, two spring grooves are symmetrically arranged, and the inner end of a limiting block movably extends into the opening end of the spring groove. A first spring is arranged between the inner end of the limiting block and the inner end of the spring groove, and the outer end of the limiting block is of a right trapezoid structure.

[0015] Preferably, the shape of the embedding groove matches the shape of the connection block, and the depth of the embedding groove is greater than the thickness of the connection block.

[0016] Preferably, the male connection assembly includes two fixed shafts symmetrically arranged on the connection block. One end of the fixed shaft is integrally and fixedly connected to the connection block, and a locking block coaxial with it is arranged at the other end of each fixed shaft. A corresponding decoupling block is also movably sleeved on the outer side of each fixed shaft.

[0017] Preferably, both the locking block and the decoupling block are frustum-shaped, and they have the same size and opposite orientations. The maximum diameter of the locking block and the decoupling block matches the inner diameter of the clamping groove.

[0018] Preferably, the brushing and grinding assembly further includes a front plate body and a rear plate body, which have the same structural shape and size. The front plate body and the rear plate body are connected by a cavity shell, so that a sealed cavity is formed inside the cavity shell. Two groups of wire guiding wheel sets two are symmetrically installed between the front plate body and the rear plate body for guiding two wire ropes. Two groups of piston tubes are symmetrically installed on the rear plate body, and one end of a corresponding piston rod is seamlessly and slidably connected inside the opening end of each piston tube. The brushing and grinding roller is connected by bearings between the other ends of the two piston rods.

[0019] Preferably, the brushing and grinding assembly further includes a dragging frame that movably penetrates through the front plate body, and both ends of the dragging frame movably penetrate into the cavity shell. A piston plate is connected between both ends of the dragging frame, and the piston plate is seamlessly and slidably connected inside the cavity shell. Each piston tube is connected to the inside of the cavity shell through a connecting pipe fitting.

[0020] Preferably, the connecting pipe fitting is L-shaped, one end of which is connected to the corresponding piston tube in a penetrating manner, and the other end is fixedly and sealingly penetrated into the inside of the cavity shell and then sealingly and movably penetrates through the piston plate. When the piston plate approaches the front plate body, the gas is squeezed, and the gas between the two is transported into the piston tube through the connecting pipe fitting.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: The thickness detector for the steel bar protective layer of the bridge pier column can be not only stably installed on the round-corner rectangular columnar bridge pier column, but also stably installed on the cylindrical bridge pier column, so that the detection operation can be carried out stably. In addition, during the process of grinding the steel bar protective layer, it can ensure that the brushing roller effectively and stably presses the bridge pier column, facilitating the uniform and rapid grinding of the protective layer, which helps to improve the detection efficiency:

[0022] 1. By locking the locking block into the corresponding clamping groove and limiting it with the corresponding limiting block, the detector can form a ring, so that it can be sleeved on the round-corner rectangular columnar bridge pier column or the cylindrical bridge pier column, thus avoiding the problem that the body of the existing detector is clamped on the cylindrical bridge pier column and is unstable due to too small clamping area;

[0023] 2. Since the volume of the bridge pier column is large, the volume of the existing detector needs to be large enough to clamp the bridge pier column, which makes it difficult to carry the existing detector. However, this detector is mainly sleeved on the outside of the bridge pier column through a wire rope, which can greatly reduce its volume, enabling the staff to carry it easily;

[0024] 3. During the process of grinding the protective layer, when the staff pulls the dragging frame by hand, the piston plate can be made to approach the front plate body, so as to ensure that the gas between the two has a tendency to be conveyed into the piston tube, and then the brushing roller has a tendency to move away from the rear plate body, that is, the brushing roller has a tendency to approach the bridge pier column, so that the brushing roller can stably press the bridge pier column, which is beneficial to its rapid and uniform grinding of the protective layer, so as to improve the detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is the front view structural schematic diagram of the present invention;

[0026] Figure 2 is the rear view structural schematic diagram of the present invention;

[0027] Figure 3 is the present invention Figure 2 the enlarged structural schematic diagram of point A therein;

[0028] Figure 4 is the sectional view structural schematic diagram of the present invention;

[0029] Figure 5 is the present invention Figure 4 the enlarged structural schematic diagram of point B therein;

[0030] Figure 6 is the partial sectional view structural schematic diagram of the present invention;

[0031] Figure 7 is the present inventionFigure 6 Schematic diagram of the enlarged structure at point C

[0032] Figure 8 Schematic diagram of the front view connection structure of the front panel of the present invention

[0033] Figure 9 Schematic diagram of the side view connection structure of the front panel and the rear panel of the present invention

[0034] In the figure: 1. Housing; 2. Locking member; 3. Steel wire rope; 4. Front panel; 5. Connection block; 6. Anti-slip bumps; 7. Rear panel; 8. Fixed shaft; 9. Locking block; 10. Hook release block; 11. Embedding groove; 12. Insertion groove; 13. Spring groove; 14. First spring; 15. Limiting block; 16. Rope winding shaft; 17. Torsion spring; 18. Ratchet and pawl limiting structure; 19. Second spring; 20. First wire guiding wheel group; 21. Second wire guiding wheel group; 22. Chamber housing; 23. Drag frame; 24. Piston tube; 25. Piston rod; 26. Connecting pipe fitting; 27. Piston plate; 28. Brush grinding roller Specific embodiments

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention

[0036] Please refer to Figures 1-9 , the present invention provides the following technical solutions

[0037] Embodiment 1: To solve the problem that the existing thickness detector for the steel bar protection layer of bridge piers cannot be stably installed on bridge piers with different shapes, the following technical solutions are provided. Specifically, a thickness detector for the steel bar protection layer of bridge piers includes a housing 1 and a rope winding assembly arranged inside it. The rope winding assembly includes a rope winding shaft 16, which is connected to the inside of the housing 1 by bearings. Steel wire ropes 3 are wound around both the upper and lower parts of the rope winding shaft 16. The tail ends of the steel wire ropes 3 are fixedly connected to the rope winding shaft 16. A first wire guiding wheel group 20 for guiding the steel wire ropes 3 is installed inside the housing 1, and the first wire guiding wheel group 20 and the steel wire ropes 3 are arranged in one-to-one correspondence. The head ends of the steel wire ropes 3 extend out of the right side of the housing 1 movably after being guided by the first wire guiding wheel group 20, and the head ends of the steel wire ropes 3 are fixedly connected with a connection block 5. A female connection assembly is arranged on the left side of the housing 1, and a male connection assembly is arranged on the connection block 5 for connecting with the female connection assembly. Anti-slip bumps 6 for anti-slip are evenly arranged on the back side of the housing 1

[0038] The rope winding assembly further includes a locking member 2 that movably penetrates through the housing 1. The locking member 2 is provided on both the upper and lower sides of the housing 1. The locking member 2 includes a large disc body and a cylindrical structure coaxially arranged therewith, and the two form a T-shaped structure. The cylindrical structure movably penetrates through the housing 1. The locking member 2 further includes rod structures that are equally angularly distributed on the large disc body, and the rod structures also movably penetrate through the housing 1 to limit the locking member 2 to prevent it from rotating. The cylindrical structure on the locking member 2 movably extends into the interior of the rope winding shaft 16, and the outside of the cylindrical structure on the locking member 2 is connected to the interior of the rope winding shaft 16 through a ratchet and pawl limiting structure 18 to limit the rotation direction of the rope winding shaft 16. The locking member 2 further includes a small disc body coaxially and fixedly connected to one end of the cylinder extending into the interior of the rope winding shaft 16. The two small disc bodies are connected by a second spring 19. The outside of the middle part of the rope winding shaft 16 is connected to the inner side of the housing 1 through a torsion spring 17 to enable the rope winding shaft 16 to automatically reset. The middle part of the rope winding shaft 16 is in the shape of an I-shaped disc structure, which is convenient for the installation of the torsion spring 17 and also convenient for separating the wire ropes 3 on the upper and lower parts of the rope winding shaft 16 to avoid cross-winding of the two. When in use, hold the locking members 2 at both ends of the housing 1 to separate the pawl and the ratchet on the ratchet and pawl limiting structure 18 (the ratchet and the pawl on the ratchet and pawl limiting structure 18 are respectively installed on the rod structure of the locking member 2 and the inner side of the rope winding shaft 16). At this time, the rope winding shaft 16 can rotate relative to the housing 1, and thus an appropriate length of the wire rope 3 can be drawn out. During the process of drawing out the wire rope 3, the rotation of the rope winding shaft 16 will cause the torsion spring 17 to accumulate elastic potential energy for subsequent winding of the wire rope 3. After drawing out an appropriate length of the wire rope 3, release the pressing on the locking member 2. At this time, the pawl and the ratchet are connected to form the ratchet and pawl limiting structure 18 again, so that the rope winding shaft 16 can only wind the wire rope 3 in one direction.

[0039] The mother connection component includes an embedding groove 11 arranged on the left side of the housing 1, and two clamping grooves 12 are symmetrically arranged inside the embedding groove 11. On the inner side of the opening end of each clamping groove 12, two spring grooves 13 are symmetrically arranged. The inner end of a limiting block 15 extends into the spring groove 13 movably at the opening end of the spring groove 13. A first spring 14 is arranged between the inner end of the limiting block 15 and the inner end of the spring groove 13. The outer end of the limiting block 15 is of a right trapezoid structure. The shape of the embedding groove 11 matches the shape of the connection block 5, and the depth of the embedding groove 11 is greater than the thickness of the connection block 5. The sub-connection component includes two fixed shafts 8 symmetrically arranged on the connection block 5. One end of the fixed shaft 8 is integrally and fixedly connected with the connection block 5, and a locking block 9 coaxial with it is arranged at the other end of each fixed shaft 8. A corresponding hook release block 10 is also movably sleeved on the outer side of each fixed shaft 8. After pulling out an appropriate length of the steel wire cable 3, the steel wire cable 3 is wound around the bridge pier column once, and the connection block 5 is clamped into the embedding groove 11, and the locking block 9 is clamped into the clamping groove 12. The limiting block 15 limits the locking block 9, so that the detector is sleeved on the outer side of the bridge pier column. Then, the steel wire cable 3 is released, and the steel wire cable 3 will be wound up by a part under the action of the torsion spring 17, and then the housing 1 is closely attached to the bridge pier column. The anti-slip bumps 6 can reduce the possibility of the housing 1 sliding on the bridge pier column. The connection with the bridge pier column by the sleeving method can not only reduce the volume of the detector, but also facilitate the stable connection with bridge pier columns of different shapes compared with the clamping method of connecting with the bridge pier column.

[0040] Both the locking block 9 and the hook release block 10 are frustum-shaped, and their sizes are the same, and they face in opposite directions. The maximum diameters of the locking block 9 and the hook release block 10 match the inner diameter of the clamping groove 12.

[0041] Embodiment 2: To solve the problem that the existing thickness detector for the steel bar protective layer of the bridge pier column cannot grind the protective layer stably, evenly and quickly, the following technical solution is provided. Specifically, the steel wire cable 3 penetrates through the brushing and grinding assembly. The brushing and grinding assembly includes a brushing and grinding roller 28 for grinding the steel bar protective layer.

[0042] The brushing and grinding assembly further includes a front plate body 4 and a rear plate body 7, both having the same structural shape and size. The front plate body 4 and the rear plate body 7 are connected by a cavity shell 22, so that a sealed cavity is formed inside the cavity shell 22. Two sets of second wire guide wheel groups 21 are symmetrically installed between the front plate body 4 and the rear plate body 7 for guiding two sections of wire ropes 3. Two sets of piston tubes 24 are symmetrically installed on the rear plate body 7, and one end of a corresponding piston rod 25 is slidably and seamlessly connected inside the open end of each piston tube 24. The brushing and grinding roller 28 is connected by bearings between the other ends of the two piston rods 25. The brushing and grinding assembly further includes a dragging frame 23 that movably penetrates the front plate body 4, and both ends of the dragging frame 23 movably penetrate into the cavity shell 22. The two ends of the dragging frame 23 are connected by a piston plate 27, and the piston plate 27 is slidably and seamlessly connected inside the cavity shell 22. Each piston tube 24 is connected to the inside of the cavity shell 22 through a connecting pipe fitting 26. When in use, the staff holds the dragging frame 23, takes their foot as the axis, tilts the body, and swings left and right reciprocally. Using their own gravity, the dragging frame 23 is driven to move reciprocally. When the dragging frame 23 moves reciprocally, it will drive the front plate body 4, the rear plate body 7, and the brushing and grinding roller 28 to move synchronously and reciprocally. Thus, the steel bar protection layer on the bridge pier can be ground off by the brushing and grinding roller 28. At the same time, since the dragging frame 23 is dragged to move by its own gravity, the piston plate 27 will approach the front plate body 4, so that the gas between the two can be squeezed. The squeezed gas enters the piston tube 24 through the connecting pipe fitting 26, which can make the piston rod 25 connected to the piston tube 24 drive the brushing and grinding roller 28 to stably press the bridge pier, helping to quickly, stably, and evenly grind off the protection layer to improve the detection efficiency.

[0043] The connecting pipe fitting 26 is L-shaped. One end of it is connected to the corresponding piston tube 24 in a penetrating manner, and the other end is fixedly and sealingly penetrated into the inside of the cavity shell 22 and then sealingly and movably penetrates through the piston plate 27. It is used to squeeze the gas when the piston plate 27 approaches the front plate body 4 and convey the gas between the two to the piston tube 24 through the connecting pipe fitting 26.

[0044] The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0045] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A thickness detector for the steel bar protective layer of a bridge pier column, comprising a housing (1) and a rope winding assembly arranged inside it, characterized in that: The rope winding assembly includes a rope winding shaft (16) bearing-connected inside the housing (1). Steel wire ropes (3) are wound around both the upper and lower parts of the rope winding shaft (16). The tail ends of the steel wire ropes (3) are fixedly connected to the rope winding shaft (16). Inside the housing (1), a first wire rope guiding wheel set (20) for guiding the steel wire ropes (3) is installed, and the first wire rope guiding wheel set (20) and the steel wire ropes (3) are arranged in one-to-one correspondence. The head ends of the steel wire ropes (3) extend out of the right side of the housing (1) movably after being guided by the first wire rope guiding wheel set (20), and a connecting block (5) is fixedly connected to the head ends of the steel wire ropes (3). A female connection assembly is arranged on the left side of the housing (1). A male connection component is arranged on the connecting block (5) for connecting with the female connection assembly. Anti-slip bumps (6) for anti-slip are evenly arranged on the back side of the housing (1). The steel wire ropes (3) pass through the brushing and grinding assembly. The brushing and grinding assembly includes a brushing and grinding roller (28) for grinding the steel bar protective layer. The brushing and grinding assembly further includes a front plate body (4) and a rear plate body (7), and their structural shapes and sizes are equal. The front plate body (4) and the rear plate body (7) are connected by a cavity shell (22), so that a sealed cavity is formed inside the cavity shell (22). Two groups of second wire rope guiding wheel sets (21) are symmetrically installed between the front plate body (4) and the rear plate body (7) for guiding two sections of the steel wire ropes (3). Two piston tubes (24) are symmetrically installed on the rear plate body (7), and one end of a corresponding piston rod (25) is slidably and seamlessly connected inside the open end of each piston tube (24). The brushing and grinding roller (28) is bearing-connected between the other ends of the two piston rods (25). The brushing and grinding assembly further includes a dragging frame (23) movably penetrating through the front plate body (4), and both ends of the dragging frame (23) movably penetrate into the cavity shell (22). Both ends of the dragging frame (23) are connected by a piston plate (27), and the piston plate (27) is slidably and seamlessly connected inside the cavity shell (22). Each piston tube (24) is connected to the inside of the cavity shell (22) through a connecting pipe fitting (26). The connecting pipe fitting (26) is L-shaped, one end of which is connected to the corresponding piston tube (24) in a penetrating manner, and the other end of which is fixedly and sealingly penetrated into the inside of the cavity shell (22) and then sealingly and movably penetrates through the piston plate (27) for squeezing gas when the piston plate (27) approaches the front plate body (4) and delivering the gas between the two to the piston tube (24) through the connecting pipe fitting (26).

2. The thickness detector for the steel bar protective layer of a bridge pier column according to claim 1, characterized in that: The rope winding assembly further includes a locking member (2) that movably penetrates the housing (1). The locking member (2) is provided on both the upper and lower sides of the housing (1). The locking member (2) includes a large disc body and a cylindrical structure coaxially arranged therewith, and the two form a T-shaped structure. The cylindrical structure movably penetrates the housing (1). The locking member (2) further includes rod structures evenly distributed at equal angles on the large disc body, and the rod structures also movably penetrate the housing (1) to limit the locking member (2) to prevent it from rotating. The cylindrical structure on the locking member (2) movably extends into the interior of the rope winding shaft (16), and the outside of the cylindrical structure on the locking member (2) is connected to the interior of the rope winding shaft (16) through a ratchet and pawl limiting structure (18) to limit the rotation direction of the rope winding shaft (16). The locking member (2) further includes a small disc body coaxially and fixedly connected to one end of the cylinder extending into the interior of the rope winding shaft (16). The two small disc bodies are connected by a second spring (19). The outside of the middle part of the rope winding shaft (16) is connected to the inner side of the housing (1) through a torsion spring (17) to enable the rope winding shaft (16) to automatically reset.

3. The thickness detector for the steel bar protective layer of a bridge pier column according to claim 2, characterized in that: The middle part of the rope winding shaft (16) is in the shape of an I-shaped disc structure, which is convenient for the installation of the torsion spring (17) and also convenient for separating the wire ropes (3) on the upper and lower parts of the rope winding shaft (16) to avoid cross-winding of the two.

4. The thickness detector for the steel bar protection layer of a bridge pier column according to claim 3, wherein: The female connection assembly includes an embedding groove (11) provided on the left side of the housing (1), and two clamping grooves (12) are symmetrically arranged inside the embedding groove (11). On the inner side of the opening end of each clamping groove (12), two spring grooves (13) are symmetrically arranged, and the inner end of a limiting block (15) movably extends into the opening end of the spring groove (13). A first spring (14) is arranged between the inner end of the limiting block (15) and the inner end of the spring groove (13), and the outer end of the limiting block (15) is in the shape of a right trapezoid.

5. The thickness detector for the steel bar protective layer of a bridge pier column according to claim 4, characterized in that: The shape of the embedding groove (11) matches the shape of the connection block (5), and the depth of the embedding groove (11) is greater than the thickness of the connection block (5).

6. The thickness detector for the steel bar protective layer of a bridge pier column according to claim 5, wherein: The male connection assembly includes two fixed shafts (8) symmetrically arranged on the connection block (5). One end of the fixed shaft (8) is integrally and fixedly connected to the connection block (5), and a locking block (9) coaxial with it is arranged at the other end of each fixed shaft (8). A corresponding hook release block (10) is also movably sleeved on the outside of each fixed shaft (8).

7. The thickness detector for the steel bar protective layer of a bridge pier column according to claim 6, characterized in that: Both the locking block (9) and the hook release block (10) are frustum-shaped, and they have the same size and opposite orientations. The maximum diameter of the locking block (9) and the hook release block (10) matches the inner diameter of the clamping groove (12).

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