Thickness detection machine for bridge pier column steel bar protection layer

Abstract

The invention discloses a thickness detection machine for a bridge pier column steel bar protective layer, and belongs to the technical field of thickness detection of bridge pier column steel bar protective layers, the thickness detection machine comprises a shell and a rope winding assembly arranged in the shell, the rope winding assembly comprises a rope winding shaft connected to the interior of the shell through a bearing, and steel wire ropes are wound on the upper portion and the lower portion of the rope winding shaft. The tail ends of the steel wire ropes are fixedly connected to the rope winding shaft, first rope guide wheel sets used for guiding the steel wire ropes are installed in the shell, and the first rope guide wheel sets and the steel wire ropes are arranged in a one-to-one correspondence mode. The device not only can be stably mounted on a rounded rectangular columnar bridge pier column, but also can be stably mounted on a cylindrical bridge pier column, so that stable detection operation can be facilitated, in addition, in the process of grinding away a steel bar protective layer, it can be guaranteed that a brush grinding roller effectively and stably extrudes the bridge pier column, and the detection efficiency is improved. The protective layer can be conveniently, uniformly and quickly ground off, and the detection efficiency can be improved.

Description

Technical Field

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

[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 protective layer plays a crucial role in the bridge pier structure; The steel bar protective 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, chemical substances, etc. 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 protective 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; At present, when the existing thickness detectors for the steel bar protective layer of bridge piers detect the thickness of the steel bar protective layer, the machine 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, so when the machine body is clamped, the stability is poor, and during the process of grinding the protective layer, it is easy to cause the machine body to separate from the pier, further increasing the instability of the clamping. Specifically as follows: The publication number CN216049582U discloses a detection tool for the steel bar protective layer of a bridge pier, 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 surface between the clamping plate and the bridge pier will decrease sharply, resulting in unstable clamping and the tool being easily separated from the bridge pier; In addition, during the process of grinding the protective layer, it is necessary to repeatedly move the installation shell. 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; 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 protective layer, which is not conducive to improving the detection efficiency; Therefore, a thickness detector for the steel bar protective layer of bridge piers is needed to solve the above problems. Summary of the Invention

[0003] The purpose of the present invention is to provide a thickness detector for the steel bar protective layer of a bridge pier column, so as to solve the problems raised in the above-mentioned background technology that the existing thickness detector for the steel bar protective layer of a bridge pier column cannot be stably clamped on bridge pier columns of different shapes, and cannot ensure that the steel bar protective layer is stably, evenly and quickly ground off.

[0004] To achieve the above purpose, the present invention provides the following technical solutions: A thickness detector for the steel bar protective layer of a bridge pier column 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 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 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 group, and a connecting block is fixedly connected to the head end of the steel wire rope. 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 bumps 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.

[0005] 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 also includes rod structures that are equally angularly 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 also 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.

[0006] 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 of the two.

[0007] Preferably, the female connection assembly includes an embedding groove arranged on the left side of the housing, and two clamping grooves are symmetrically arranged inside the embedding groove. Two spring grooves are symmetrically arranged inside the opening end of each clamping groove, 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 in the shape of a right-angled trapezoid.

[0008] Preferably, the shape of the embedding groove matches the shape of the connecting block, and the depth of the embedding groove is greater than the thickness of the connecting block.

[0009] Preferably, the sub-connecting assembly includes two fixed shafts symmetrically arranged on the connecting block. One end of each fixed shaft is integrally and fixedly connected to the connecting block, and a locking block coaxial with it is provided at the other end of each fixed shaft. A corresponding decoupling block is movably sleeved outside each fixed shaft.

[0010] 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.

[0011] 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 II are symmetrically installed between the front plate body and the rear plate body for guiding two sections of wire ropes. Two groups of piston pipes are symmetrically installed on the rear plate body, and one end of a corresponding piston rod is seamlessly and slidably connected inside the open end of each piston pipe. The brushing and grinding roller is connected by bearings between the other ends of the two piston rods.

[0012] Preferably, the brushing and grinding assembly further includes a dragging frame that movably penetrates 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 slidably connected inside the cavity shell. Each piston pipe is connected to the inside of the cavity shell through a connecting pipe fitting.

[0013] Preferably, the connecting pipe fitting is L-shaped. One end of it is connected to the corresponding piston pipe 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, so as to squeeze the gas when the piston plate approaches the front plate body and convey the gas between the two to the piston pipe through the connecting pipe fitting.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: The thickness detector for the steel bar protection layer of the bridge pier column can not only be stably installed on the round-corner rectangular columnar bridge pier column, but also be stably installed on the cylindrical bridge pier column, so as to facilitate stable detection operations. In addition, during the process of grinding the steel bar protection 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 protection layer, and helping to improve the detection efficiency. 1. By fitting the locking block into the corresponding card slot and limiting it with the corresponding limiting block, the detector can form a ring, so that it can be sleeved on the columnar bridge pier with a rounded rectangle or the cylindrical bridge pier, thus avoiding the problem that the body of the existing detector is clamped on the cylindrical bridge pier and is unstable due to too small clamping area. 2. Since the bridge pier is large in volume, the existing detector needs to be large enough to clamp the bridge pier, which makes it difficult to carry the existing detector. However, this detector is mainly sleeved on the outside of the bridge pier through a wire rope, which can greatly reduce its volume and enable the staff to carry it easily. 3. During the process of grinding off the protective layer, the staff can pull the dragging frame by hand, so that the piston plate approaches the front plate body, which can ensure that the gas between the two has a tendency to be transported into the piston tube, and further makes the brushing roller have a tendency to move away from the rear plate body, that is, makes the brushing roller have a tendency to approach the bridge pier, so that the brushing roller can stably press the bridge pier, which is beneficial to quickly and evenly grinding off the protective layer to improve the detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is the front view structural schematic diagram of the present invention; Figure 2 is the rear view structural schematic diagram of the present invention; Figure 3 is the present invention Figure 2 the enlarged structural schematic diagram of point A in; Figure 4 is the sectional view structural schematic diagram of the present invention; Figure 5 is the present invention Figure 4 the enlarged structural schematic diagram of point B in; Figure 6 is the partial sectional view structural schematic diagram of the present invention; Figure 7 is the present invention Figure 6 the enlarged structural schematic diagram of point C in; Figure 8 is the front view connection structural schematic diagram of the front plate body of the present invention; Figure 9 is the side view connection structural schematic diagram of the front plate body and the rear plate body of the present invention.

[0016] In the figure: 1. Housing; 2. Locking member; 3. Steel wire rope; 4. Front plate body; 5. Connecting block; 6. Anti-slip bump; 7. Rear plate body; 8. Fixed shaft; 9. Locking block; 10. Hook release block; 11. Embedding groove; 12. Clamping groove; 13. Spring groove; 14. First spring; 15. Limit block; 16. Rope winding shaft; 17. Torsion spring; 18. Ratchet and pawl limit structure; 19. Second spring; 20. First wire guide wheel set; 21. Second wire guide wheel set; 22. Chamber housing; 23. Drag frame; 24. Piston tube; 25. Piston rod; 26. Connecting pipe fitting; 27. Piston plate; 28. Brush grinding roller. Detailed implementation mode

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to 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.

[0018] Please refer to Figures 1-9 , the present invention provides the following technical solutions: Embodiment 1: To solve the problem that the existing thickness detector for the steel bar protective layer of bridge piers cannot be stably installed on bridge piers of different shapes, the following technical solutions are provided. Specifically, a thickness detector for the steel bar protective 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, and 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 guide wheel set 20 for guiding the steel wire ropes 3 is installed inside the housing 1, and the first wire guide 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 guide 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, and a male connection assembly is arranged on the connecting block 5 for connecting to the female connection assembly. Anti-slip bumps 6 for anti-slip are evenly arranged on the back side of the housing 1.

[0019] 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 with it, and the two form a T-shaped structure. The cylindrical structure movably penetrates 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 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. When in use, hold the locking members 2 at both ends of the housing 1 to separate the pawl and ratchet on the ratchet and pawl limiting structure 18 (the ratchet and 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 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.

[0020] The female connection component includes an embedding groove 11 provided on the left side of the housing 1. Two clamping grooves 12 are symmetrically arranged inside the embedding groove 11. Two spring grooves 13 are symmetrically arranged on the inner side of the opening end of each clamping groove 12. The inner end of a limiting block 15 extends into the spring groove 13 movably. 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 male 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 to the connection block 5. 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 sleeved on the outside of each fixed shaft 8 movably. After pulling out an appropriate length of the wire rope 3, the wire rope 3 is wound around the bridge pier column once, and the connection block 5 is inserted into the embedding groove 11, and the locking block 9 is inserted into the clamping groove 12. The locking block 9 is limited by the limiting block 15, so that the detector is sleeved on the outside of the bridge pier column. Then, the wire rope 3 is released. The wire rope 3 will be wound up partially 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.

[0021] 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.

[0022] Embodiment 2: To solve the problem that the existing thickness detector for the steel bar protection layer of bridge pier columns cannot grind the protection layer stably, evenly and quickly, the following technical solution is provided. Specifically, the wire rope 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 protection layer.

[0023] The brushing and grinding assembly further includes a front plate body 4 and a rear plate body 7, both of which have 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 groups of wire guiding wheel sets II 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 groups of piston tubes 24 are symmetrically installed on the rear plate body 7, and one end of a corresponding piston rod 25 is slidably connected without a gap 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 connected without a gap 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 an axis, tilts the body, and swings left and right reciprocally. By 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 reciprocally synchronously. Furthermore, 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, and the piston rod 25 connected to the piston tube 24 can drive the brushing and grinding roller 28 to stably press the bridge pier, which helps to quickly, stably and evenly grind off the protection layer to improve the detection efficiency.

[0024] The connecting pipe fitting 26 is L-shaped. One end of it is connected to the corresponding piston tube 24 through penetration, and the other end of it is fixedly penetrated into the inside of the cavity shell 22 in a sealed manner and then movably penetrates through the piston plate 27 in a sealed manner, and is used for squeezing gas when the piston plate 27 approaches the front plate body 4 and conveying the gas between the two to the piston tube 24 through the connecting pipe fitting 26.

[0025] The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0026] 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 spirits of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A bridge pier steel bar protective layer thickness detection machine, comprising a housing (1) and a rope winding assembly arranged inside the housing, characterized in that: The rope winding assembly comprises a rope winding shaft (16), the rope winding shaft (16) bearing is connected to the inside of the housing (1), and the upper and lower parts of the rope winding shaft (16) are both wound with steel wire ropes (3), the tail end of the steel wire rope (3) is fixedly connected to the rope winding shaft (16), and the inside of the housing (1) is equipped with a guide rope wheel group (20) for guiding the steel wire rope (3), and the guide rope wheel group (20) and the steel wire rope (3) are arranged in a one-to-one correspondence, and the head end of the steel wire rope (3) is guided by the guide rope wheel group (20). The rope pulley group 1 (20) is guided and movably extends out of the right side of the housing (1), and the head end of the steel wire rope (3) is fixedly connected to a connecting block (5). A mother connecting component is arranged on the left side of the housing (1), and a sub-connecting component is arranged on the connecting block (5) for connecting to the mother connecting component. The back side of the housing (1) is evenly provided with anti-skid protrusions (6) for anti-skid. The steel wire rope (3) passes through the brush grinding component, and the brush grinding component includes a brush grinding roller (28) for grinding away the protective layer of the steel bar.

2. The thickness detection machine of the steel bar protective layer of a bridge pier column according to claim 1 is characterized by: The rope winding assembly further comprises a locking member (2) which movably passes through the housing (1). The locking member (2) is arranged on both the upper and lower sides of the housing (1). The locking member (2) comprises a large disc and a cylindrical structure which is arranged coaxially therewith. The two form a T-shaped structure. The cylindrical structure movably passes through the housing (1). The locking member (2) further comprises a rod structure which is distributed at equal angles on the large disc. The rod structure also movably passes through the housing (1) and is used to limit the locking member (2) to prevent it from rotating. The cylindrical structure on the locking member (2) movably extends into the rope winding member. The locking member (2) is provided inside the shaft (16), and the outer side of the cylindrical structure on the locking member (2) is connected to the inside of the rope winding shaft (16) through a ratchet pawl limiting structure (18), so as to limit the rotation direction of the rope winding shaft (16). The locking member (2) also includes a small disc body coaxially fixedly connected to one end of the cylindrical body extending into the inside of the rope winding shaft (16), and the two small disc bodies are connected by a spring 2 (19). The outer side 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), so as to automatically reset the rope winding shaft (16).

3. The thickness detection machine of the steel bar protective layer of a bridge pier column according to claim 2 is characterized by: The middle portion of the rope winding shaft (16) is in an I-shaped disc structure, which facilitates the installation of the torsion spring (17) and facilitates the separation of the steel wire rope (3) at the upper and lower portions of the rope winding shaft (16) to prevent the two from being intertwined.

4. The thickness detection machine of the steel bar protective layer of a bridge pier column according to claim 3 is characterized by: The female connection assembly comprises an embedding groove (11) arranged on the left side of the shell (1), and two snap-in grooves (12) are symmetrically arranged inside the embedding groove (11), and two spring grooves (13) are symmetrically arranged inside the open end of each snap-in groove (12), and the open end of the spring groove (13) movably extends into the inner end of the limit block (15), a spring 1 (14) is arranged between the inner end of the limit block (15) and the inner end of the spring groove (13), and the outer end of the limit block (15) is a right-angle step structure.

5. The thickness detection machine of the steel bar protective layer of a bridge pier column according to claim 4 is characterized by: The shape of the embedding groove (11) matches the shape of the connecting block (5), and the depth of the embedding groove (11) is greater than the thickness of the connecting block (5).

6. The thickness detection machine of the steel bar protective layer of a bridge pier column according to claim 5 is characterized by: The sub-connection assembly comprises two fixed shafts (8) symmetrically arranged on the connection block (5), one end of the fixed shaft (8) being integrally fixedly connected to the connection block (5), and the other end of each fixed shaft (8) being provided with a locking block (9) coaxial therewith, and the outer side of each fixed shaft (8) is also movably sleeved with a corresponding unhooking block (10).

7. The thickness detection machine of the steel bar protective layer of a bridge pier column according to claim 6 is characterized by: The locking block (9) and the unhooking block (10) are both truncated cone-shaped and have the same size and are oriented in opposite directions. The maximum diameters of the locking block (9) and the unhooking block (10) match the inner diameter of the snap-in groove (12).

8. The thickness detection machine of the steel bar protective layer of a bridge pier column according to claim 7 is characterized by: The brush grinding assembly also includes a front plate body (4) and a rear plate body (7), both of which have the same structure, shape and size. The front plate body (4) and the rear plate body (7) are connected via a cavity shell (22), so that a sealed cavity is formed in the cavity shell (22). Two groups of guide wheel groups (21) are symmetrically installed between the front plate body (4) and the rear plate body (7) for guiding two sections of steel wire ropes (3). Two groups of piston tubes (24) are symmetrically installed on the rear plate body (7), and the opening end of each piston tube (24) is seamlessly slidably connected to one end of a corresponding piston rod (25). The brush grinding roller (28) is bearing-connected between the other ends of the two piston rods (25).

9. The thickness detection machine of the steel bar protective layer of a bridge pier column according to claim 8 is characterized by: The brush grinding assembly further comprises a drag frame (23) movably penetrating the front plate body (4), and both ends of the drag frame (23) movably penetrate into the cavity shell (22), the two ends of the drag frame (23) are connected via a piston plate (27), and the piston plate (27) is seamlessly slidably connected to the cavity shell (22), and each of the piston tubes (24) is connected to the interior of the cavity shell (22) via a connecting pipe (26).

10. The thickness detection machine of the steel bar protective layer of a bridge pier column according to claim 9 is characterized by: The connecting pipe (26) is L-shaped, one end of which is connected to the corresponding piston tube (24), and the other end of which is sealed and fixed to penetrate into the interior of the chamber shell (22), and is provided with a sealing movement to penetrate the piston plate (27), so as to squeeze the gas when the piston plate (27) is close to the front plate body (4), and to transport the gas between the two to the piston tube (24) through the connecting pipe (26).

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