Circular bridge pier column diameter measuring equipment

Abstract

The invention discloses a circular bridge pier column diameter measuring device, and belongs to the technical field of bridge pier column measurement, the circular bridge pier column diameter measuring device comprises a cart, the upper end face of the cart is symmetrically provided with two movable cylinders, the outer side of the movable cylinder on the right side is fixedly sleeved with a worm gear, and a rocker is fixed to the end of the worm. The protective box is arranged on the outer side of the worm gear and the outer side of the worm in a sleeving mode. The device further comprises a lead screw, the lead screw penetrates through the movable cylinder on the right side in a threaded mode, a fixed rod penetrates through the movable cylinder on the left side in a sliding mode, a measuring mechanism is arranged above the supporting base, the measuring mechanism can be stored to reduce the occupied space, and a cleaning mechanism is arranged on the inner side of the measuring mechanism. According to the circular bridge pier column diameter measuring equipment, automatic measurement is achieved by attaching to a pier column, the data accuracy can be improved, the measuring equipment can be rapidly folded when not used, then the occupied area is reduced, meanwhile, marl adhering to the equipment can be cleaned in the measuring process, and the measuring accuracy is prevented from being affected.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge pier measurement, and specifically relates to a circular bridge pier diameter measurement device. Background Art

[0002] A pier is a lower load-bearing structure for supporting the upper structure, mainly used in the construction of roads, bridges, etc. Piers have rectangular, circular, and other special-shaped structures. During the construction of circular piers, it is necessary to measure their diameters to more accurately excavate foundation pits of corresponding sizes for subsequent construction. For example, a circular pier diameter measurement tool with the publication number CN221198394U includes a circular pier measurement and clamping assembly, and a diameter measurement assembly is arranged on the circular pier measurement and clamping assembly; the circular pier clamping plate in the circular pier measurement and clamping assembly can be used to achieve fitting and clamping with the circular pier, making the diameter measurement of the circular pier simple and convenient. Moreover, the adjusting screw rod positions and controls the first and second mounting seats, enabling the clamping and positioning of the circular pier clamping plate to be highly convenient and stable, thus making the overall use effect good when measuring the diameter of the circular pier. The distance measuring instrument and distance measuring plate arranged in the diameter measurement assembly can make the diameter measurement of the circular pier highly convenient; For example, a portable bridge circular pier diameter measurement device with the publication number CN219200298U includes a main ruler and positioning straight rods arranged at both ends of the main ruler. The positioning straight rods are rotationally hinged on the main ruler and can rotate relative to the main ruler for storage. The main ruler has an expansion amount along the length direction of its ruler body, and the positioning straight rods have a folding amount along the direction perpendicular to the ruler body of the main ruler. The two positioning straight rods are used to clamp the pier to be measured; a level and an electronic measurement device are arranged on the main ruler. The electronic measurement device includes a displacement sensor and a control panel. When the level is in a horizontal state, the displacement sensor measures the expansion amount of the main ruler to obtain the distance between the inner sides of the two positioning straight rods, and the control panel is used to display the distance data, solving the limitations existing in existing detections and being applicable to various detection environments. However, the above diameter measurement device still has the following disadvantages during actual use: 1. For traditional pier measurement, the method of manually holding a measuring ruler is adopted. Therefore, there are certain errors during measurement, and multiple repeated measurements are required, which increases the construction time. Moreover, the measurement device occupies a large space and is not convenient for folding and storage; 2. After the measurement device contacts the pier, the mud and ash on the pier will fall on the measurement device, and there is no structure for cleaning the mud and ash during the measurement process, which affects the clarity when viewing the scale. Usually, it is cleaned manually after measurement.

[0003] In view of the above problems, there is an urgent need to innovate and design on the basis of the original diameter measurement device. Summary of the Invention

[0004] The object of the present invention is to provide a circular bridge pier column diameter measuring device to solve the problems in the above-mentioned background technology that there are certain errors in the traditional measurement of pier columns, the measuring device occupies a large space, is not convenient for folding and storage, and there is no structure for cleaning mud and ash during the measurement process.

[0005] To achieve the above object, the present invention provides the following technical solution: A circular bridge pier column diameter measuring device, comprising: a trolley, on the upper end face of the trolley, two movable cylinders are symmetrically arranged, and the left movable cylinder is fixedly connected to the trolley, the right movable cylinder is rotatably connected to the trolley, a worm gear is fixedly sleeved on the outer side of the right movable cylinder, and a worm is meshed with the side of the worm gear, a rocker is fixed at the end of the worm, and the rocker rotatably penetrates through the side surface of the protective box, the protective box is sleeved on the outer sides of the worm gear and the worm, and the protective box is fixedly connected to the trolley; It further comprises: a lead screw, which is threadedly penetrated through the right movable cylinder, a fixed rod is slidably penetrated through the left movable cylinder, and the tops of the fixed rod and the lead screw are fixedly connected to the lower end face of the support seat, a measuring mechanism is arranged above the support seat, and the measuring mechanism can be unfolded to measure the diameter of the pier column, and the measuring mechanism can be stored to reduce the occupied space, a cleaning mechanism is arranged inside the measuring mechanism, and the cleaning mechanism is used for cleaning the mud and ash adhered to the measuring mechanism.

[0006] Preferably, the measuring mechanism includes a fixed cylinder fixed above the support seat, and the middle of the fixed cylinder is disconnected, and the disconnected part is fixedly connected through a sleeve block, and a measuring scale is fixed on the side surface of the sleeve block. Through the arrangement of the fixed cylinder and the sleeve block, it is convenient for the measuring plate to move and rotate.

[0007] Preferably, connecting scales are arranged at both ends of the measuring scale, and the connecting scales are rotatably connected to the measuring scale through damping members, and the rotation range of the connecting scales is 0-90°. The measuring scale and the connecting scales can be rotated to the horizontal state for measurement, and the connecting scales can also be rotated 90° for storage.

[0008] Preferably, the measuring mechanism further includes measuring plates arranged at both ends of the fixed cylinder, and the measuring plates are connected to the fixed cylinder through movable tubes, and pointers are fixed at both ends of the fixed cylinder. At the same time, the end of the pointer away from the fixed cylinder is in contact with the surface of the measuring scale. The distance between the two pointers is equal to the distance between two relatively distributed guide rollers. When the measuring plate moves, it can drive the support to move on the measuring scale, which is convenient for observing the scale.

[0009] Preferably, a connecting plate is fixed to one end of the measuring plate away from the movable pipe, and the connecting plate and the measuring plate are of an integrated structure. Fixing grooves are formed inside both the measuring plate and the connecting plate. Guide rollers are rotatably arranged inside the fixing grooves, and the guide rollers are evenly distributed. When the measuring plate and the connecting plate come into contact with the pier column, the guide rollers can be driven to rotate, improving the smoothness during the contact process.

[0010] Preferably, the measuring plates and the connecting plates are symmetrically distributed about the vertical axis of the sleeve block. The moving directions of the two measuring plates and the two connecting plates are opposite. The two measuring plates are parallel to each other, and the two connecting plates are both inclined. Due to the inclined structure of the connecting plates, it is convenient for the two measuring plates to move to both sides of the pier column.

[0011] Preferably, the cleaning mechanism includes one-way air inlet valves arranged on the sleeve block, and the air inlet valves are arranged at both ends of the fixed cylinder. A piston plate is fixed to one end of the movable pipe away from the measuring plate. The piston plate is hollow inside, and fixing blocks are symmetrically arranged at the edge of the piston plate. During the movement of the piston plate, the gas inside the sleeve block and the fixed cylinder can enter the cavity of the piston plate.

[0012] Preferably, an activity groove is formed inside the fixed cylinder outside the fixing block. The fixing block and the fixed cylinder form a sliding structure through the activity groove. The maximum distance between the two fixing blocks is equal to the inner diameter of the sleeve block, and the inner diameter of the sleeve block is greater than the inner diameter of the fixed cylinder. When the piston plate moves, it drives the fixing block to slide in the activity groove, thereby driving the measuring plate to move.

[0013] Preferably, a one-way first air inlet and a second air inlet are respectively arranged on both sides of the piston plate. The first air inlet is communicated with the inside of the sleeve block, and the second air inlet is communicated with the inside of the fixed cylinder. The movable pipe and the fixed cylinder are in sliding connection. The movable pipe and the measuring plate are fixedly connected. A spring for resetting is fixedly wound outside the movable pipe. One end of the spring away from the movable pipe is in contact with the fixed cylinder. When the measuring plate moves, it drives the movable pipe to slide on the fixed cylinder and compresses the spring.

[0014] Preferably, the movable pipe is communicated with the air delivery channel. The air delivery channel is formed inside the measuring plate and the connecting plate. Air outlet holes are reserved inside both the measuring plate and the connecting plate. The air outlet holes are evenly distributed, and the air outlet holes and the guide rollers are correspondingly distributed. The rotation ranges of both the measuring plate and the piston plate are 0 - 90°. The gas inside the piston plate can be transmitted to the air delivery channel through the movable pipe and finally discharged from the air outlet holes.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The circular bridge pier column diameter measuring device can achieve automatic measurement by fitting with the pier column, which can improve the accuracy of data. When the measuring device is not in use, it can be quickly folded to reduce the occupied area. At the same time, during the measurement process, the mud and ash adhering to the device can be cleaned to avoid affecting the measurement accuracy. The specific content is as follows: 1. When the side of the pier column contacts the guiding roller, it can drive the guiding roller to rotate, which can improve the smoothness of the movement of the measuring plate and the connecting plate. When the pier column is between the two measuring plates, the two measuring plates move away from each other under force, driving the movable tube to slide in the fixed cylinder and compressing the spring inside it. Through the elastic force of the spring, the measuring plate can be closely attached to the side of the pier column, and the two measuring plates move the same distance, which is convenient to view the diameter of the pier column through the measuring scale; 2. First, rotate the two connecting scales by 90° to be perpendicular to the measuring scale, thereby reducing the occupied area. Then, push the two measuring plates closer to each other so that the two piston plates are inside the sleeve block. At this time, the fixed block is not limited by the movable groove and can rotate the measuring plate by 90°, turning the horizontal measuring plate to a vertical state, further reducing the occupied area and realizing the storage of the measuring device. When measurement is needed, just rotate the connecting scale reversely by 90° to be flush with the measuring scale, and rotate the measuring plate reversely by 90°. Then, pull the measuring plate so that the movable groove limits the fixed block, which can ensure the stability of the measuring plate in the horizontal state, making it only movable and unable to rotate; 3. When the two measuring plates move away from each other, the gas in the fixed cylinder is compressed by the movement of the piston plate. The gas enters the piston plate through the second air inlet. The gas in the piston plate can be transmitted to the air delivery channel through the movable tube and finally blown out from the air outlet holes to blow the mud and ash on the guiding roller. When the two measuring plates move closer to each other, the gas in the sleeve block is squeezed into the inside of the piston plate through the first air inlet, and it can still clean the guiding roller to prevent the adhesion of mud and ash from affecting the measurement accuracy. Description of the Drawings

[0016] Figure 1 is the overall structural schematic diagram of the present invention; Figure 2 is the structural schematic diagram of the worm and the worm gear of the present invention; Figure 3 is the top - view structural schematic diagram of the measuring plate and the connecting plate of the present invention; Figure 4 is the cross - sectional structural schematic diagram of the measuring plate of the present invention; Figure 5 is the cross - sectional structural schematic diagram of the fixed cylinder of the present invention; Figure 6 is the structural schematic diagram of the fixed groove of the present invention; Figure 7 is the side - view structural schematic diagram of the sleeve block of the present invention; Figure 8 Schematic diagram of the folding structure of the connecting ruler of the present invention; Figure 9 Schematic diagram of the overall storage structure of the present invention; Figure 10 Schematic cross-sectional structure diagram of the sleeve block of the present invention.

[0017] In the figure: 1, trolley; 2, movable cylinder; 3, worm gear; 4, worm; 5, rocker; 6, protective box; 7, lead screw; 8, fixed rod; 9, support seat; 10, fixed cylinder; 11, measuring ruler; 12, connecting ruler; 13, sleeve block; 14, air inlet valve; 15, movable pipe; 16, piston plate; 17, fixed block; 18, movable groove; 19, first air inlet; 20, second air inlet; 21, pointer; 22, measuring plate; 23, connecting plate; 24, air delivery channel; 25, air outlet hole; 26, fixed groove; 27, guide roller. Detailed implementation manners

[0018] 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.

[0019] Please refer to Figures 1 - 10 , the present invention provides the following technical solutions: Embodiment 1: To solve the problems existing in the prior art, therefore, in this embodiment, through the following technical solutions, a circular bridge pier column diameter measuring device includes: a trolley 1, two movable cylinders 2 are symmetrically arranged on the upper end surface of the trolley 1, and the left movable cylinder 2 is fixedly connected to the trolley 1, the right movable cylinder 2 is rotatably connected to the trolley 1, a worm gear 3 is fixedly sleeved on the outside of the right movable cylinder 2, and a worm 4 is meshed on the side of the worm gear 3, a rocker 5 is fixed at the end of the worm 4, and the rocker 5 rotatably penetrates through the side surface of the protective box 6, the protective box 6 is sleeved outside the worm gear 3 and the worm 4, and the protective box 6 is fixedly connected to the trolley 1; further includes: a lead screw 7, which is threadedly penetrated in the right movable cylinder 2, a fixed rod 8 slidably penetrates through the left movable cylinder 2, and the tops of the fixed rod 8 and the lead screw 7 are fixedly connected to the lower end surface of the support seat 9, a measuring mechanism is arranged above the support seat 9, and the measuring mechanism can be unfolded to measure the diameter of the pier column, the measuring mechanism can be stored to reduce the occupied space, a cleaning mechanism is arranged inside the measuring mechanism, and the cleaning mechanism is used to clean the mud and ash adhered to the measuring mechanism; as Figures 1 - 2As shown, before measuring the pier column, the height of the measuring mechanism can be adjusted. Rotate the rocker 5 to drive the worm 4 to rotate, and then drive the movable cylinder 2 on the right side to rotate through the meshing transmission of the worm 4 and the worm wheel 3. In this way, through the threaded transmission of the movable cylinder 2 and the lead screw 7, the lead screw 7 can be driven to extend, and the fixed rod 8 can be driven to slide in the movable cylinder 2, driving the support seat 9 to rise. In this way, the height of the measuring mechanism can be adjusted, so as to meet the measurement of the diameters of pier columns at different heights.

[0020] In the traditional measurement of pier columns, the method of manually holding the measuring ruler 11 is adopted. Therefore, there are certain errors during measurement, and multiple repeated measurements are required, which increases the construction time. Moreover, the measuring equipment occupies a large space and is not convenient for folding and storage. For example Figure 1 、 Figures 3 - 5 and Figures 7 - 10As shown in the figure, the measuring mechanism includes a fixed cylinder 10 fixed above the support base 9. The middle of the fixed cylinder 10 is disconnected and is fixedly connected through a sleeve block 13. A measuring ruler 11 is fixed on the side of the sleeve block 13. Connecting rulers 12 are arranged at both ends of the measuring ruler 11. The connecting ruler 12 and the measuring ruler 11 form a rotating structure through a damping member, and the rotation range of the connecting ruler 12 is 0-90°. The measuring mechanism also includes measuring plates 22 arranged at both ends of the fixed cylinder 10. The measuring plates 22 are connected to the fixed cylinder 10 through movable tubes 15. Pointers 21 are fixed at both ends of the fixed cylinder 10. At the same time, the end of the pointer 21 far from the fixed cylinder 10 contacts the surface of the measuring ruler 11. The distance between the two pointers 21 is equal to the distance between two relatively distributed guide rollers 27. A connecting plate 23 is fixed at the end of the measuring plate 22 far from the movable tube 15. The connecting plate 23 and the measuring plate 22 are of an integrated structure. Fixed grooves 26 are formed inside both the measuring plate 22 and the connecting plate 23. Guide rollers 27 are rotatably arranged inside the fixed grooves 26, and the guide rollers 27 are equally spaced. The measuring plates 22 and the connecting plates 23 are symmetrically distributed about the vertical axis of the sleeve block 13. The moving directions of the two measuring plates 22 and the two connecting plates 23 are opposite. The two measuring plates 22 are parallel to each other, and the two connecting plates 23 are both inclined.Push the device to near the pier column by the trolley 1, place the pier column between the two connecting plates 23 and continue to push the trolley 1. The inclined connecting plates 23 can make the pushing smoother. When the side of the pier column contacts the guiding roller 27, it can drive the guiding roller 27 to rotate, which can improve the smoothness when the connecting plate 23 moves. After the pier column is between the two connecting plates 23, continue to push it to drive the pier column between the two measuring plates 22. The two measuring plates 22 are forced to move away from each other and drive the movable tube 15 to slide in the fixed cylinder 10, driving the spring inside it to compress. Through the elastic force of the spring, the measuring plate 22 can be closely attached to the side of the pier column. When the measuring plate 22 moves, it drives the pointer 21 to move on the measuring scale 11 and the connecting scale 12. The diameter of the pier column can be conveniently checked through the scales on it. Since the pointer 21 always moves with the measuring plate 22, the initial distance between the two pointers 21 is the same as the initial distance between the two relatively distributed guiding rollers 27. The specific size when measuring the pier column is calculated according to the distance that the measuring plate 22 drives the pointer 21 to move, that is, the initial distance plus twice the moving distance. After the measurement is completed, pull the trolley 1 to drive the measuring plate 22 and the connecting plate 23 to separate from the pier column. Through the resilience of the spring, the two measuring plates 22 are driven to approach each other. When the measuring device needs to be folded and stored, first rotate the two connecting scales 12 by 90° to be perpendicular to the measuring scale 11, thereby reducing the occupied area. Then push the two measuring plates 22 closer to drive the movable tube 15 to slide in the fixed cylinder 10, so that the two piston plates 16 are inside the sleeve block 13. At this time, the fixed block 17 on the piston plate 16 is not limited by the movable groove 18 and can rotate the measuring plate 22 by 90°, turning the horizontal measuring plate 22 to the vertical state, further reducing the occupied area and facilitating the device to be pushed to other positions. When measurement is needed, just rotate the connecting scale 12 reversely by 90° to be flush with the measuring scale 11, and rotate the measuring plate 22 reversely by 90°. Then pull the measuring plate 22 to drive the piston plate 16 to contact the fixed cylinder 10, and limit the fixed block 17 through the movable groove 18, so as to ensure the stability of the measuring plate 22 in the horizontal state, making it only movable and not rotatable.;

[0021] Embodiment 2: After the measuring device contacts the pier column, the mud and ash on the pier column will fall on the measuring device, and there is no structure for cleaning the mud and ash during the measurement process, which affects the clarity when viewing the scale. Usually, it is cleaned manually after the measurement. Therefore, this embodiment adopts the following technical solutions, such as Figures 4 - 6As shown in the figure, the cleaning mechanism includes a one-way intake valve 14 arranged on the sleeve block 13, and the intake valve 14 is arranged at both ends of the fixed cylinder 10. One end of the movable pipe 15 far from the measuring plate 22 is fixed with a piston plate 16, and the piston plate 16 is hollow inside, and fixing blocks 17 are symmetrically arranged at the edge of the piston plate 16; an activity groove 18 is opened in the fixed cylinder 10 outside the fixing block 17, and the fixing block 17 and the fixed cylinder 10 form a sliding structure through the activity groove 18, and the maximum distance between the two fixing blocks 17 is equal to the inner diameter of the sleeve block 13, and at the same time the inner diameter of the sleeve block 13 is larger than the inner diameter of the fixed cylinder 10; on both sides of the piston plate 16 are respectively arranged a one-way first air inlet 19 and a second air inlet 20, and the first air inlet 19 is communicated with the inside of the sleeve block 13, and the second air inlet 20 is communicated with the inside of the fixed cylinder 10, and the movable pipe 15 and the fixed cylinder 10 are slidably connected, the movable pipe 15 and the measuring plate 22 are fixedly connected, and a spring for resetting is fixedly wound outside the movable pipe 15, and one end of the spring far from the movable pipe 15 is in close contact with the fixed cylinder 10; the movable pipe 15 is communicated with the air delivery channel 24, and the air delivery channel 24 is opened in the measuring plate 22 and the connecting plate 23, and air outlet holes 25 are reserved on the inner sides of the measuring plate 22 and the connecting plate 23, the air outlet holes 25 are arranged at equal intervals, and the air outlet holes 25 and the guide rollers 27 are correspondingly distributed, and the rotation ranges of the measuring plate 22 and the piston plate 16 are both 0-90°; when the measuring plate 22 and the connecting plate 23 are pushed into contact with the pier column, the mud and ash on the pier column will fall on the equipment. Therefore, when the two measuring plates 22 move away from each other, the gas in the fixed cylinder 10 is squeezed by the movement of the piston plate 16, and the gas enters the cavity of the piston plate 16 through the second air inlet 20. At this time, the two piston plates 16 move away from each other, causing a negative pressure in the sleeve block 13, and enabling the outside gas to enter it through the intake valve 14 on the sleeve block 13. The gas in the piston plate 16 can be transmitted to the air delivery channel 24 through the movable pipe 15 and finally discharged from the air outlet holes 25 and blown onto the guide rollers 27. Therefore, during the process of the measuring plate 22 contacting the pier column, the mud and ash on the guide rollers 27 can be blown off by the blown gas, and the cleaning can improve the tightness of the contact between the guide rollers 27 and the pier column, thereby improving the measurement accuracy. When the two measuring plates 22 move closer to each other, the outside gas is drawn in from the intake valve 14 on the fixed cylinder 10 through the movement of the piston plate 16, and the gas in the sleeve block 13 is squeezed into the inside of the piston plate 16 through the first air inlet 19, still enabling the cleaning of the guide rollers 27 to prevent the adhesion of mud and ash from affecting the measurement accuracy, and one-way valves are arranged in both the intake valve 14 and the air inlets, which can effectively avoid gas backflow.

[0022] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A circular bridge pier column diameter measuring device, comprising: A trolley (1), on the upper end face of the trolley (1), two movable cylinders (2) are symmetrically arranged. The left movable cylinder (2) is fixedly connected to the trolley (1), and the right movable cylinder (2) is rotatably connected to the trolley (1). A worm gear (3) is fixedly sleeved on the outer side of the right movable cylinder (2), and a worm (4) is meshed with the side of the worm gear (3). The end of the worm (4) is fixed with a rocker (5), and the rocker (5) rotatably penetrates through the side surface of the protective box (6). The protective box (6) is sleeved on the outer sides of the worm gear (3) and the worm (4), and the protective box (6) is fixedly connected to the trolley (1); It is characterized in that it further comprises: A lead screw (7) threadedly penetrates through the right movable cylinder (2). A fixed rod (8) slidably penetrates through the left movable cylinder (2). The tops of the fixed rod (8) and the lead screw (7) are fixedly connected to the lower end face of the support seat (9). Above the support seat (9), a measuring mechanism is arranged. The measuring mechanism can be unfolded to measure the diameter of the pier column and can be retracted to reduce the occupied space. A cleaning mechanism is arranged inside the measuring mechanism, and the cleaning mechanism is used to clean the mud and ash adhered to the measuring mechanism.

2. The diameter measuring device for a circular bridge pier column according to claim 1, characterized in that: The measuring mechanism includes a fixed cylinder (10) fixed above the support seat (9). The middle of the fixed cylinder (10) is disconnected and fixedly connected through a sleeve block (13). A measuring scale (11) is fixed on the side surface of the sleeve block (13).

3. A circular bridge pier column diameter measuring device according to claim 2, characterized in that: Both ends of the measuring scale (11) are provided with connecting scales (12). The connecting scales (12) form a rotating structure with the measuring scale (11) through damping members, and the rotation range of the connecting scales (12) is 0 - 90°.

4. The circular bridge pier column diameter measuring device according to claim 2, wherein: The measuring mechanism further includes measuring plates (22) arranged at both ends of the fixed cylinder (10). The measuring plates (22) are connected to the fixed cylinder (10) through movable tubes (15). At both ends of the fixed cylinder (10), pointers (21) are fixedly provided. At the same time, the end of the pointer (21) far from the fixed cylinder (10) contacts the surface of the measuring scale (11). The distance between the two pointers (21) is equal to the distance between two relatively distributed guide rollers (27).

5. The circular bridge pier column diameter measuring device according to claim 4, characterized in that: One end of the measuring plate (22) far from the movable tube (15) is fixed with a connecting plate (23). The connecting plate (23) and the measuring plate (22) are of an integrated structure. Fixed slots (26) are opened inside both the measuring plate (22) and the connecting plate (23). At the same time, guide rollers (27) are rotatably arranged inside the fixed slots (26), and the guide rollers (27) are equally spaced.

6. The circular bridge pier column diameter measuring device according to claim 4, characterized in that: The measuring plates (22) and the connecting plates (23) are symmetrically distributed about the vertical axis of the sleeve block (13). The moving directions of the two measuring plates (22) and the two connecting plates (23) are opposite. The two measuring plates (22) are parallel to each other, and the two connecting plates (23) are both inclined.

7. A circular bridge pier column diameter measuring device according to claim 1, characterized in that: The cleaning mechanism includes a one-way intake valve (14) provided on the sleeve block (13), and the intake valve (14) is provided at both ends of the fixed cylinder (10). One end of the movable tube (15) away from the measuring plate (22) is fixed with a piston plate (16), and the piston plate (16) is hollow inside. Fixed blocks (17) are symmetrically arranged at the edge of the piston plate (16).

8. The circular bridge pier column diameter measuring device according to claim 7, wherein: An activity groove (18) is formed in the fixed cylinder (10) outside the fixed block (17), and the fixed block (17) and the fixed cylinder (10) form a sliding structure through the activity groove (18). The maximum distance between the two fixed blocks (17) is equal to the inner diameter of the sleeve block (13), and the inner diameter of the sleeve block (13) is greater than the inner diameter of the fixed cylinder (10).

9. The circular bridge pier column diameter measuring device according to claim 7, wherein: A one-way first air inlet (19) and a second air inlet (20) are respectively arranged on both sides of the piston plate (16). The first air inlet (19) is communicated with the inside of the sleeve block (13), and the second air inlet (20) is communicated with the inside of the fixed cylinder (10). The movable tube (15) and the fixed cylinder (10) are in sliding connection, the movable tube (15) and the measuring plate (22) are fixedly connected, and a spring for resetting is fixedly wound outside the movable tube (15). One end of the spring away from the movable tube (15) is in fit contact with the fixed cylinder (10).

10. A circular bridge pier column diameter measuring device according to claim 7, characterized in that: The movable tube (15) is communicated with the air delivery channel (24), and the air delivery channel (24) is formed in the measuring plate (22) and the connecting plate (23). Air outlet holes (25) are reserved on the inner sides of the measuring plate (22) and the connecting plate (23). The air outlet holes (25) are arranged at equal intervals, and the air outlet holes (25) and the guide rollers (27) are correspondingly distributed. The rotation ranges of both the measuring plate (22) and the piston plate (16) are 0-90°.

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