A device and method for measuring the internal structure dimensions of a bridge

Abstract

The present invention discloses a device for measuring the internal structure size of a bridge, which includes an installation frame. At the center of the top of the installation frame, an adjustment mechanism for adjustment and locking is provided. On the outside of the adjustment mechanism, a rotation mechanism for angle rotation is provided. Above the installation frame, a measurement mechanism for size measurement is provided; through the combined setting of the adjustment mechanism and the rotation mechanism, the present invention can have the advantage of adjusting the measurement angle direction, so as to adapt to different bridges and ventilation holes opened at different position angles. The cooperation of the connection mechanism and the measurement mechanism is conducive to realizing the advantage of measuring the internal structure size of the bridge by threading and extending inside the ventilation hole. The accuracy during measurement is improved according to the scale display. Among them, the elastic clamping connection between the first tooth plate and the second tooth plate completes the locking, and the two can be separated for rotation adjustment. The threaded connection and extension between the nut and the screw can ensure the stability during measurement, thereby improving the measurement accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge detection, and particularly relates to a device and method for measuring the internal structure size of a bridge. Background Technique

[0002] A bridge generally refers to a structure erected over rivers, lakes, and seas to enable vehicles, pedestrians, etc. to pass smoothly. To adapt to the modern rapidly developing transportation industry, a bridge is also extended to a building erected across mountain streams, poor geological conditions, or to meet other traffic needs to make passage more convenient;

[0003] Due to various factors such as the construction era and the preservation of historical archives of some existing bridges, the drawing materials are missing. During the actual detection process, especially when it is necessary to evaluate the bearing capacity of a bridge, the accuracy of the structural dimensions is particularly important. Currently, the approximate dimensions can be measured indirectly by using steel bars or iron wires through the ventilation holes at the bottom of the beam or by additionally opening holes. However, since the measurements are taken multiple times, the cross-sections of the multiple measurements before and after may shift, resulting in different readings;

[0004] Moreover, during the measurement of the internal structure size of a bridge, it is necessary to extend the measurement based on the originally opened ventilation holes or the subsequently opened holes. Since the angles of the holes opened at different positions are different, it is not conducive to people's operations during the measurement process, thus reducing the detection accuracy and the usage effect. Summary of the Invention

[0005] The purpose of the present invention is to provide a device and method for measuring the internal structure size of a bridge, which have the advantages of improving the detection accuracy, and at the same time can be adjusted according to the required angle, so as to improve the adaptability during use and facilitate people's operations, in order to solve the problems raised in the above background technique.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A device for measuring the internal structure size of a bridge, including an installation frame. At the center of the top of the installation frame, there is an adjustment mechanism for adjustment and locking. The outside of the adjustment mechanism is provided with a rotation mechanism for angle rotation. Above the installation frame, there is a measurement mechanism for size measurement. Inside the rotation mechanism, there is a pressing mechanism for supporting and moving the measurement mechanism. At the top of the pressing mechanism, there is a locking mechanism for fixing and disassembling the measurement mechanism. At the top of the rotation mechanism, there is a connection mechanism for adapting to the measurement mechanism;

[0007] The adjusting mechanism includes a vertical rod installed at the top of the mounting frame. A connection box is fixedly installed at the top of the mounting frame. A partition is fixedly installed in the middle of the inner cavity of the connection box. A first spring and a cross bar are fixedly installed outside the partition. A first toothed plate is fixedly installed at the outer end of the cross bar. A shielding plate is fixedly installed on the surface of the cross bar. A sliding plate is fixedly installed on the surface of the cross bar. A sliding rod slidably penetrates through the outside of the shielding plate.

[0008] Exemplarily, the outer end of the first spring is fixed to the shielding plate. Sliding holes are formed at both ends of the bottom of the connection box. A pulling plate is fixedly installed at the bottom of the shielding plate. The bottom end of the shielding plate penetrates through the sliding hole to the bottom of the connection box.

[0009] Exemplarily, the rotating mechanism includes fixing plates respectively fixedly installed at both ends of the top of the mounting frame. A damping rotating shaft is rotatably connected to the inner side of the fixing plates. A mounting bracket is fixedly installed on the outer side of the damping rotating shaft. A second toothed plate is fixedly installed at the inner end of the damping rotating shaft.

[0010] Exemplarily, the second toothed plate is engaged with the first toothed plate. The outer end of the sliding rod is fixed to the inner side wall of the fixing plate.

[0011] Exemplarily, the connecting mechanism includes a cover plate bolted to the top of the mounting bracket. Adaptation grooves are formed at the bottom of the cover plate and the top of the mounting bracket. A nut is placed inside the adaptation groove.

[0012] Exemplarily, the pressing mechanism includes a through groove formed on the outer side of the mounting bracket. A connecting rod is slidably connected to the inner side wall of the through groove. A baffle is fixedly installed at the outer end of the connecting rod. A second spring is welded to the inner side of the baffle. The inner end of the second spring is welded to a sleeve plate. The sleeve plate slides on the outer side of the connecting rod. The inner side of the sleeve plate abuts against the outer side of the mounting bracket;

[0013] A carrier plate is fixedly installed at the inner end of the connecting rod. A rotating seat is rotatably connected to the middle of the carrier plate. A slot is formed at the top end of the rotating seat.

[0014] Exemplarily, the locking mechanism includes third springs respectively welded to both ends of the top of the carrier plate. A connecting plate is welded to the top ends of the third springs. A limiting rod is fixedly installed at the bottom of the connecting plate and slidably penetrates below the carrier plate;

[0015] The top ends of the third springs and the carrier plate are both welded with pressing blocks. An insertion rod is fixedly installed at the bottom of the pressing block.

[0016] Exemplarily, the measuring mechanism includes an adaptation component and an extension component. The adaptation component is arranged on the top of the rotating seat. The extension component is arranged on the top of the adaptation component.

[0017] Exemplarily, the adaptation component includes an insertion block which is inserted inside a slot. A circular plate is attached to the top of the insertion block. Blind holes are formed at the four circumferences of the top of the circular plate. The insertion rod is inserted inside the blind hole. An installation groove is formed at one side of the circular plate. A spirit level is inserted inside the installation groove and is bolted to the circular plate.

[0018] The extension component includes a screw rod which is fixedly installed at the top of the insertion block. Scale lines are engraved on the outer side of the screw rod. The screw rod is rotatably connected to the circular plate in a penetrating manner.

[0019] A measurement method includes the following steps:

[0020] S1. Angle adjustment: While pulling the pull plate inward to drive the shutter to move and pulling the cross bar to move synchronously. When the shutter moves, it will squeeze the first spring, and the first toothed plate will directly disengage from the second toothed plate and rotate. At this time, directly rotate the mounting bracket to drive the connected components to rotate together inside the fixed plate. When it rotates to the required position, release the pulling force until the elastic force pushes the first toothed plate to be stuck inside the second toothed plate.

[0021] S2. Disassembling and assembling the measuring piece: Directly push the limiting rod upward to drive the connecting plate to stretch the third spring, so that the pressing block drives the insertion rod to move upward, and then take out the screw rod. At this time, the screw rod drives the circular plate to be located on the top of the rotating seat, and the insertion block is inserted inside the slot to form positioning. Then release the above-mentioned pushing force, and according to the elastic force of the third spring, the insertion rod is inserted inside the blind hole to form fixation.

[0022] S3. Dimension measurement: Directly push the rotating seat to drive the screw rod above to move upward and contact the nut, and then rotate the rotating seat. At this time, during the rotation of the rotating seat, the screw rod is directly driven to rotate by the insertion block and is threadedly connected to the nut to form a threaded extension. Until it extends to the required position, measure the specific dimension according to the scale line.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] 1. Through the coordinated setting of the adjustment mechanism and the rotation mechanism, the present invention can have the advantage of adjusting the measurement angle direction, so as to adapt to different bridges and ventilation holes opened at different positions and angles. The cooperation of the connection mechanism and the measurement mechanism is beneficial to realize the advantage of measuring the internal structure size of the bridge by performing threaded extension inside the ventilation hole. The accuracy during measurement is improved according to the scale display. The elastic clamping between the first toothed plate and the second toothed plate completes the locking, and the two can be separated for rotation adjustment. The threaded connection and extension between the nut and the screw rod can ensure the stability during measurement, thereby improving the measurement accuracy.

[0025] 2. The present invention is provided with a cooperation of a pressing mechanism and a locking mechanism, which has the advantages of carrying and pushing / pulling the measuring mechanism to ensure stable operation without obstruction during its up and down movement and rotation. At the same time, it also has the advantage of quickly disassembling and assembling the measuring mechanism, so that disassembly, inspection or replacement operations can be carried out. The pressing mechanism is conducive to elastically supporting the locking mechanism and can also assist it in sliding up and down, while the locking mechanism is used for disassembling and assembling the measuring mechanism and limiting its installation, so that disassembly, inspection and replacement can be realized.

[0026] Other features and advantages of the present invention will be described in the following specification, and in part, will become apparent from the specification or will be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the structures pointed out in the specification and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic structural diagram of the present invention;

[0028] Figure 2 It is a schematic structural diagram of the fitting groove of the present invention;

[0029] Figure 3 It is a schematic structural diagram of the pressing mechanism of the present invention;

[0030] Figure 4 It is a schematic structural diagram of the insertion block of the present invention;

[0031] Figure 5 It is a schematic structural diagram of the slot of the present invention;

[0032] Figure 6 It is a schematic structural diagram of the installation frame of the present invention;

[0033] Figure 7 It is a schematic structural diagram of the second toothed plate of the present invention;

[0034] Figure 8 It is a schematic structural diagram of the adjusting mechanism of the present invention;

[0035] Figure 9 It is a schematic structural diagram of the first spring of the present invention;

[0036] Figure 10 It is a schematic structural diagram of the partition plate of the present invention.

[0037] In the figure: 1. Installation frame; 2. Adjusting mechanism; 21. Vertical rod; 22. Connection box; 23. Partition board; 24. First spring; 25. Cross bar; 26. Shading board; 27. First toothed plate; 28. Slide bar; 29. Slide plate; 3. Rotating mechanism; 31. Fixed plate; 32. Damping rotating shaft; 33. Second toothed plate; 34. Mounting bracket; 4. Connecting mechanism; 41. Adaptation slot; 42. Nut; 43. Cover plate; 5. Tightening mechanism; 51. Through slot; 52. Connecting rod; 53. Baffle; 54. Second spring; 55. Sleeve plate; 56. Rotating seat; 57. Insertion slot; 58. Carrier plate; 6. Locking mechanism; 61. Third spring; 62. Connecting plate; 63. Limit rod; 64. Pressing block; 65. Inserting rod; 7. Measuring mechanism; 71. Circular plate; 72. Inserting block; 73. Installation slot; 74. Spirit level; 75. Screw rod; 76. Scale line. Detailed implementation manner

[0038] 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 work fall within the protection scope of the present invention.

[0039] The present invention provides a device for measuring the internal structure size of a bridge, including an installation frame 1. At the center of the top of the installation frame 1, an adjusting mechanism 2 for adjusting and locking is provided. On the outside of the adjusting mechanism 2, a rotating mechanism 3 for angle rotation is provided. Above the installation frame 1, a measuring mechanism 7 for size measurement is provided. Inside the rotating mechanism 3, a tightening mechanism 5 for supporting and moving the measuring mechanism 7 is provided. On the top of the tightening mechanism 5, a locking mechanism 6 for fixing and disassembling the measuring mechanism 7 is provided. On the top of the rotating mechanism 3, a connecting mechanism 4 for adapting to the measuring mechanism 7 is provided;

[0040] The adjusting mechanism 2 includes a vertical rod 21. The vertical rod 21 is installed on the top of the installation frame 1. A connection box 22 is fixedly installed on the top of the installation frame 1. In the middle of the inner cavity of the connection box 22, a partition board 23 is fixedly installed. On the outside of the partition board 23, a first spring 24 and a cross bar 25 are fixedly installed. At the outer end of the cross bar 25, a first toothed plate 27 is fixedly installed. On the surface of the cross bar 25, a shading board 26 is fixedly installed. On the surface of the cross bar 25, a slide plate 29 is fixedly installed. The slide bar 28 slides through the outside of the shading board 26.

[0041] It is used to realize the angle adjustment work during the detection process, so as to adapt to the ventilation holes opened at different positions and angles, and can realize accurate extension measurement, thereby improving the measurement effect and efficiency.

[0042] Among them, the outer end of the first spring 24 is fixed to the shielding plate 26. Both ends of the bottom of the connection box 22 are provided with sliding holes. A pulling plate is fixedly installed at the bottom of the shielding plate 26. The bottom end of the shielding plate 26 passes through the bottom of the connection box 22 through the sliding holes. The sliding holes are used to ensure that the pulling plate is unobstructed during the moving process, and the pulling plate is used to drive the shielding plate 26 to slide.

[0043] Preferably:

[0044] As Figure 7 shown, the rotating mechanism 3 includes a fixing plate 31. The fixing plates 31 are respectively fixedly installed at both ends of the top of the installation frame 1. A damping rotating shaft 32 is rotatably connected to the inner side of the fixing plate 31. An installation frame 34 is fixedly installed on the outer side of the damping rotating shaft 32. A second toothed plate 33 is fixedly installed at the inner end of the damping rotating shaft 32.

[0045] Among them, the second toothed plate 33 is clamped with the first toothed plate 27. The outer end of the sliding rod 28 is fixed to the inner side wall of the fixing plate 31, which is used to play a role in fixing after the angle is adjusted and can achieve stable support.

[0046] When adjusting:

[0047] At the same time, pull the two groups of pulling plates inward. At this time, the pulling plates drive the corresponding two groups of shielding plates 26 to move inward, so that the shielding plates 26 slide on the surface of the cross bar 25, and at the same time squeeze the first spring 24 and drive the cross bar 25 to move, thereby driving the first toothed plate 27 to move and disengaging from the clamped state with the second toothed plate 33. At this time, the installation frame 34 can be rotated. Since the installation frame 34 is rotatably connected between the damping rotating shaft 32 and the fixing plate 31, it can be forced to rotate when an external force is applied, so that it can be rotated to the preset angle direction according to the needs of the user. Then stop rotating, and then release the pushing and squeezing force on the pulling plate. At this time, the first spring 24 releases according to its elasticity, and then pushes the first toothed plate 27 to move outward until the first toothed plate 27 and the second toothed plate 33 are clamped to form a clamped fixation to position the adjusted angle.

[0048] Furthermore:

[0049] As Figure 2 shown, the connecting mechanism 4 includes a cover plate 43. The cover plate 43 is bolted to the top of the installation frame 34. Adaptation grooves 41 are provided at the bottom of the cover plate 43 and the top of the installation frame 34. A nut 42 is placed inside the adaptation grooves 41, which can realize the installation and disassembly of the nut 42 and is used to limit the nut 42 to facilitate stable adaptation to the screw rod 75.

[0050] During installation:

[0051] The nut 42 is directly placed in the fitting groove 41 opened at the top of the mounting bracket 34. Then, the cover plate 43 is taken out and placed on the top of the nut 42. Subsequently, the cover plate 43 and the mounting bracket 34 are bolted together with a pre-prepared bolt. At this time, the nut 42 is clamped between the cover plate 43 and the mounting bracket 34, thus achieving the installation and limitation of the nut 42. At the same time, the shape of the fitting groove 41 is the same as the outer shape of the nut 42, achieving complete adaptation.

[0052] Furthermore:

[0053] As Figure 5 shown, the pressing mechanism 5 includes a through groove 51 opened on the outer side of the mounting bracket 34. A connecting rod 52 is slidably connected to the inner side wall of the through groove 51. A baffle 53 is fixedly installed at the outer end of the connecting rod 52. A second spring 54 is welded to the inner side of the baffle 53. The inner end of the second spring 54 is welded to a sleeve plate 55. The sleeve plate 55 slides on the outer side of the connecting rod 52, and the inner side of the sleeve plate 55 abuts against the outer side of the mounting bracket 34;

[0054] While the through groove 51 adapts to the connecting rod 52 and assists it in sliding up and down, the connecting rod 52 is used to play a role in lateral support and connection. The elastic push between the baffle 53, the second spring 54, and the sleeve plate 55 is used to elastically support the carrier plate 58 in a pressing manner;

[0055] The inner end of the connecting rod 52 is fixedly installed with a carrier plate 58. A rotating seat 56 is rotatably connected to the middle of the carrier plate 58. A slot 57 is opened at the top of the rotating seat 56. The carrier plate 58 is conducive to supporting and installing the components above it. Secondly, the rotating seat 56 and the slot 57 can limit the measuring mechanism 7 during the installation process, and can also drive the screw 75 in the measuring mechanism 7 to rotate.

[0056] According to the elastic push of the second spring 54, the sleeve plate 55 will be pushed to tightly abut against the outer side of the mounting bracket 34 to achieve auxiliary support for the carrier plate 58, and it will not move downward autonomously without external force.

[0057] In addition:

[0058] As Figure 5 shown, the locking mechanism 6 includes third springs 61 welded to both ends of the top of the carrier plate 58. The top of the third springs 61 is welded with a connecting plate 62. A limiting rod 63 is fixedly installed at the bottom of the connecting plate 62. The limiting rod 63 slides through to the lower side of the carrier plate 58;

[0059] Both the third springs 61 and the top of the carrier plate 58 are welded with pressing blocks 64. An insertion rod 65 is fixedly installed at the bottom of the pressing block 64, which is used to install and disassemble the measuring mechanism 7, so as to achieve the advantages of quick disassembly and assembly, and is conducive to subsequent maintenance or direct replacement operations.

[0060] During installation:

[0061] Directly push the two groups of limit rods 63 upward. The limit rods 63 will directly push the connecting plate 62 to drive the pressing block 64 to move upward, while stretching the third spring 61. Then, take out the screw rod 75 and place it on the top of the limit rods 63. Then release the upward pushing force. According to the contractility of the third spring 61, drive the plug rod 65 to move downward through the pressing block 64 until the plug rod 65 is inserted into the blind hole, so as to realize the downward pressing type fixing work. When disassembly is required, after pushing the two groups of limit rods 63 upward as described above, pull up the screw rod 75 and then it can be horizontally removed.

[0062] Finally, the measuring mechanism 7 includes an adaptation component and an extension component. The adaptation component is arranged on the top of the rotating seat 56, and the extension component is arranged on the top of the adaptation component.

[0063] As Figure 4 shown, the adaptation component includes a plug block 72. The plug block 72 is inserted into the slot 57. A round plate 71 is attached to the top of the plug block 72. Blind holes are formed at the four circumferences of the top of the round plate 71. The plug rod 65 is inserted into the blind holes. An installation groove 73 is formed on one side of the round plate 71. A spirit level 74 is inserted into the installation groove 73. The spirit level 74 is bolted to the round plate 71. The round plate 71 and the plug block 72 are used to play an auxiliary positioning and locking role during installation, and the spirit level 74 plays a role in horizontal auxiliary calibration, so as to ensure the horizontality after extension, thereby improving the measurement accuracy during detection;

[0064] The extension component includes a screw rod 75. The screw rod 75 is fixedly installed on the top of the plug block 72. Scale lines 76 are engraved on the outer side of the screw rod 75. The screw rod 75 is rotatably connected to the round plate 71 in a penetrating manner. The screw rod 75 and the scale lines 76 formed on the surface can realize scale measurement during the stable extension process, so as to know the depth at any time.

[0065] Realize the extension into the inside of the bridge ventilation hole, so as to complete the measurement operation.

[0066] During measurement:

[0067] After the above-mentioned preparatory work is completed, measurement can be carried out. Directly push the rotating seat 56 upward, so as to drive the carrier plate 58 and the components connected thereto to move upward together, and the connecting rod 52 will slide inside the through groove 51. When the screw rod 75 moves upward to the bottom of the nut 42, directly rotate the rotating seat 56. Use the rotating seat 56 to drive the plug block 72 to rotate, and the plug block 72 can drive the screw rod 75 to rotate. The screw rod 75 and the round plate 71 are in a rotatable connection state. At this time, the operation is convenient to slightly push upward and rotate at the same time until the screw rod 75 threadedly penetrates the nut 42 and continues to extend until it extends into the bridge through the bridge ventilation hole to measure the size of the internal structure inside the bridge.

[0068] A measurement method, comprising the following steps:

[0069] S1, Angle adjustment: While pulling the pull plate inward to drive the shutter to move and pulling the cross bar to move synchronously. When the shutter moves, it will squeeze the first spring, and the first toothed plate will directly disengage from the second toothed plate and rotate. At this time, directly rotate the mounting bracket to drive the connected components to rotate together inside the fixed plate. When it rotates to the required position, release the pulling force until the elastic force pushes the first toothed plate to be stuck inside the second toothed plate;

[0070] S2, Disassembling and assembling the measuring part: Directly push the limiting rod upward to drive the connecting plate to stretch the third spring, so that the pressing block drives the plug rod to move upward, and then take out the screw rod. At this time, the screw rod drives the circular plate to be located on the top of the rotating seat, and the plug block is inserted into the slot to form positioning. At this time, release the above-mentioned pushing force, and the elastic force of the third spring will cause the plug rod to be inserted into the blind hole to form fixation;

[0071] S3, Dimension measurement: Directly push the rotating seat to drive the screw rod above to move upward and contact the nut, and then rotate the rotating seat. At this time, during the rotation of the rotating seat, the screw rod is directly driven to rotate by the plug block and is threadedly connected to the nut to form a threaded extension. Until it extends to the required position, measure the specific dimension according to the scale line.

[0072] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A bridge internal structure dimension measuring device, characterized in that: The invention comprises a mounting frame (1), wherein an adjusting mechanism (2) for adjusting and locking is arranged at the center of the top of the mounting frame (1), a rotating mechanism (3) for angular rotation is arranged on the outside of the adjusting mechanism (2), a measuring mechanism (7) for dimension measurement is arranged above the mounting frame (1), a pressing mechanism (5) for supporting and moving the measuring mechanism (7) is arranged on the inside of the rotating mechanism (3), a locking mechanism (6) for fixing and disassembling the measuring mechanism (7) is arranged on the top of the pressing mechanism (5), and a connecting mechanism (4) for adapting to the measuring mechanism (7) is arranged on the top of the rotating mechanism (3); The adjustment mechanism (2) comprises a vertical rod (21), the vertical rod (21) is mounted on the top of the installation frame (1), a connection box (22) is fixedly mounted on the top of the installation frame (1), a partition (23) is fixedly mounted in the middle of the inner cavity of the connection box (22), a first spring (24) and a cross rod (25) are fixedly mounted on the outer side of the partition (23), a first tooth plate (27) is fixedly mounted on the outer end of the cross rod (25), a shield plate (26) is fixedly mounted on the surface of the cross rod (25), a slide plate (29) is fixedly mounted on the surface of the cross rod (25), and a slide bar (28) is slidably penetrated through the outer side of the shield plate (26); The outer end of the first spring (24) is fixed to the shield (26), sliding holes are provided at both ends of the bottom of the connection box (22), a pull plate is fixedly installed at the bottom of the shield (26), and the bottom end of the shield (26) passes through the sliding hole to the bottom of the connection box (22); The rotating mechanism (3) comprises a fixing plate (31), the fixing plate (31) being fixedly mounted at two ends of the top of the mounting frame (1), the inner side of the fixing plate (31) being rotatably connected to a damping rotating shaft (32), the outer side of the damping rotating shaft (32) being fixedly mounted with a mounting frame (34), and the inner end of the damping rotating shaft (32) being fixedly mounted with a second toothed plate (33); The second tooth plate (33) is clamped with the first tooth plate (27), and the outer end of the sliding rod (28) is fixed to the inner side wall of the fixing plate (31); The connecting mechanism (4) comprises a cover plate (43), the cover plate (43) is bolted to the top of the mounting frame (34), the bottom of the cover plate (43) and the top of the mounting frame (34) are both provided with an adapting groove (41), and a nut (42) is placed inside the adapting groove (41); The pressing mechanism (5) comprises a through groove (51), the through groove (51) is arranged on the outer side of the mounting frame (34), the inner side wall of the through groove (51) is slidably connected with a connecting rod (52), the outer end of the connecting rod (52) is fixedly mounted with a baffle (53), the inner side of the baffle (53) is welded with a second spring (54), the inner end of the second spring (54) is welded with a sleeve plate (55), the sleeve plate (55) slides on the outer side of the connecting rod (52), and the inner side of the sleeve plate (55) presses against the outer side of the mounting frame (34); A carrier plate (58) is fixedly mounted on the inner end of the connecting rod (52), a rotating seat (56) is rotatably connected to the middle of the carrier plate (58), and a slot (57) is provided at the top of the rotating seat (56); The locking mechanism (6) comprises a third spring (61), the third spring (61) is respectively welded to two ends of the top of the carrier plate (58), a connecting plate (62) is welded to the top of the third spring (61), a limiting rod (63) is fixedly installed at the bottom of the connecting plate (62), and the limiting rod (63) slides through the bottom of the carrier plate (58); A pressing block (64) is welded to the top of the third spring (61) and the carrier plate (58), and an insert rod (65) is fixedly installed at the bottom of the pressing block (64); The measuring mechanism (7) comprises an adapting component and an extending component, wherein the adapting component is arranged on the top of the rotating seat (56), and the extending component is arranged on the top of the adapting component; The adapter assembly comprises an insert block (72), the insert block (72) is inserted into the inside of the slot (57), a circular plate (71) is fitted on the top of the insert block (72), blind holes are provided around the top of the circular plate (71), the insert rod (65) is inserted into the inside of the blind hole, a mounting groove (73) is provided on one side of the circular plate (71), a level bubble (74) is inserted into the inside of the mounting groove (73), and the level bubble (74) is bolted to the circular plate (71); the extension assembly comprises a screw rod (75), the screw rod (75) is fixedly mounted on the top of the insert block (72), a scale line (76) is engraved on the outer side of the screw rod (75), and the screw rod (75) is rotatably connected to the circular plate (71) in a through-type manner.

2. A measurement method, characterized in that: The device for measuring the internal structure dimensions of a bridge as claimed in claim 1 comprises the following steps: S1, angle adjustment, pull the pull plate inward to drive the shield plate to move and pull the cross bar to move synchronously, when the shield plate moves, it will squeeze the first spring, and the first tooth plate will directly disengage from the second tooth plate and rotate, at this time, directly rotate the mounting frame to drive the connected parts to rotate together on the inner side of the fixed plate, when it rotates to the desired position, release the pulling force until the elastic pushes the first tooth plate to be clamped on the inner side of the second tooth plate; S2, disassemble and assemble the measuring piece, directly push the limit rod upward to drive the connecting plate to stretch the third spring, so that the pressure block can drive the plug rod to move upward, and then take out the screw rod. At this time, the screw rod drives the round plate to be located at the top of the rotating seat, and the plug block is inserted into the inside of the slot to form a positioning. At this time, the elastic push of the third spring causes the plug rod to be inserted into the inside of the blind hole to form a fixation. S3, size measurement, directly push the rotating seat to drive the upper screw to move up and rotate the rotating seat after contacting the nut. At this time, the rotating seat drives the screw to rotate directly through the insert block during the rotation process, and is threadedly connected with the nut to form a thread extension. After extending to the required position, the specific size at the location can be measured according to the scale line.

Images