CN221280217U - Device for measuring width of bridge crack - Google Patents

Abstract

The utility model belongs to the technical field of bridge measurement, and particularly relates to a device for measuring the width of a bridge crack. The utility model comprises a supporting component, a limiting component, an elastic component and a sensing control component; the limiting component and the elastic component are connected in the supporting component up and down; the sensing control assembly is connected to the outer side of the upper portion of the supporting assembly. According to the utility model, the support assembly is inserted into and clings to the inner wall of the crack, then the distance between two vertical plates in the support assembly is measured through the sensing control assembly, and the crack width of the bridge can be accurately obtained through simple calculation. The utility model does not need to take large-amplitude actions such as bending down and the like during reading, does not need manual reading, does not cause reading errors due to external conditions such as light and the like, and ensures the accuracy of measurement. The bridge crack measuring device is simple in structure and convenient to operate, and solves the problems that the existing bridge crack measuring device is inconvenient to operate manually and easy to bring measuring errors.

Description

Device for measuring width of bridge crack

Technical Field

The utility model belongs to the technical field of bridge measurement, and particularly relates to a device for measuring the width of a bridge crack.

Background

Cracks are one of the most common diseases of concrete bridges. The appearance of cracks not only can damage the attractive appearance of the bridge and reduce the stressed area of the section, but also can influence the permeation resistance of the structure, so that moisture and harmful substances can permeate, and the corrosion of the reinforcing steel bars is induced or the natural aging of concrete is accelerated, thereby damaging the bearing capacity of the bridge structure and adversely affecting the safety performance of the bridge.

The crack width is an important parameter of the crack morphology. The utility model patent with the application number of CN202220785993.8 entitled "bridge crack measuring device for bridge engineering" provides a crack width measuring device, and although the above technical scheme can realize the measurement of bridge cracks, in actual operation, manual reading is still required. According to common knowledge, when the measured bridge crack is at a low position, the device needs to be placed close to the crack, so that an operator needs to bend down and the like to perform large-amplitude actions, then manual reading can be performed, reading errors are easily caused due to the action of light rays and the like, and further measuring errors are caused.

Disclosure of utility model

The utility model provides a device for measuring the width of a bridge crack, and aims to provide a measuring device which can solve the problems of inconvenience in manual operation and easiness in measurement error of the existing bridge crack measuring device.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

The device for measuring the width of the bridge crack comprises a supporting component, a limiting component, an elastic component and a sensing control component; the limiting component and the elastic component are connected in the supporting component up and down; the sensing control assembly is connected to the outer side of the upper portion of the supporting assembly.

The supporting component comprises a vertical plate, a rotating bar and a supporting block; the two vertical plates are arranged in parallel; the two sides of each vertical piece are respectively connected with a rotating bar; the outer side of the lower end of each vertical piece is provided with an inclined end with a thick upper part and a thin lower part; the outer side wall of the middle part of each vertical piece is fixedly connected with a supporting block; a vertical hole for connecting the sensing control component is formed in the side wall of the upper part of each vertical plate.

The rotating strip is an arc-shaped plate; the width of the arc-shaped plate is the same as the thickness of the vertical plate; the rotating strips arranged on the two vertical plates are inwards bent and oppositely arranged.

The limiting assembly comprises a top block, a rotating rod and a vertical block; the number of the rotating rods is two; the middle parts of the two rotating rods are crossed and rotatably connected, the upper ends of the two rotating rods are rotatably connected to the opposite inner side walls of the supporting component through top blocks respectively, and the lower ends of the two rotating rods are slidably connected to the opposite inner side walls of the supporting component through vertical blocks respectively.

The top block consists of two semicircular arc plates; the two semicircular arc plates are connected to the inner side wall of the supporting component in parallel; round through holes are formed in each semicircular arc plate, and a cross rod is horizontally connected between the two round through holes; the upper end of the rotating rod is rotatably connected to the cross rod.

The vertical block is of a cuboid structure; the vertical block is provided with a strip-shaped sliding hole along the axial direction, and the lower end of the rotating rod can slide up and down along the strip-shaped sliding hole; the lower end of the rotating rod is provided with an anti-drop block.

The elastic component comprises a casing, a spring and a loop bar; the sleeve shell, the spring and the loop bar are all horizontally connected to the side walls of the supporting assembly, which are oppositely arranged; the spring is sleeved on the loop bar, and the sleeve is sleeved outside the spring.

The casing comprises a first casing, a second casing and a third casing, wherein two ends of the second casing are respectively sleeved in the first casing and the third casing, and the second casing can slide in the first casing and the third casing; the loop bar comprises a first loop bar, a second loop bar and a third loop bar, and the first loop bar and the second loop bar, the third loop bar and the second loop bar can slide relatively.

The outer side wall of one end of the second casing is provided with a plurality of convex blocks, and the inner side wall of the first casing is provided with a slideway corresponding to the convex blocks on the second casing; a plurality of lugs are arranged on the outer side wall of one end of the third casing, and a slideway corresponding to the lug on the third casing is arranged on the inner side wall of the second casing.

The sensing control component comprises a distance sensor, a connecting seat and a receiving end; the distance sensor is connected to the supporting component through a connecting seat; and the distance sensor is in electrical signal connection with the receiving end.

The beneficial effects are that:

(1) According to the utility model, two parallel vertical plates are arranged to serve as a supporting component; the elastic component is arranged at the lower part of the vertical piece, so that the end faces of the two vertical pieces, which are mutually backed, are tightly attached to the inner wall of the crack, then the distance between the two vertical pieces is measured through the distance sensor, and the crack width of the bridge can be accurately obtained through simple calculation.

(2) The utility model does not need to take large-amplitude actions such as bending down and the like during reading, does not need manual reading, does not cause reading errors due to external conditions such as light and the like, and ensures the accuracy of measurement.

(3) The bottom end of the vertical piece is provided with the inclined end, so that the vertical piece can be conveniently and rapidly inserted into the crack.

(4) According to the utility model, the elastic assembly formed by the casing, the spring and the loop bar ensures that the two vertical plates are always in a vertical and parallel state under the cooperation of the limiting assembly, and ensures the accuracy of the measured seam width.

(5) According to the utility model, the outer side walls of one ends of the second casing and the third casing are respectively provided with a plurality of convex blocks, and the inner side walls of the first casing and the second casing are respectively provided with the sliding ways corresponding to the convex blocks on the second casing and the third casing, so that the first casing, the second casing and the third casing are effectively prevented from relative rotation around the round mandrel, and the two vertical sheets are ensured to be always in a mutually parallel state.

(6) The bridge crack measuring device is simple in structure and convenient to operate, and solves the problems that the existing bridge crack measuring device is inconvenient to operate manually and easy to bring measuring errors.

The foregoing description is only an overview of the technical solution of the present utility model, and in order to make the technical means of the present utility model more clearly understood, it can be implemented according to the content of the specification, and the following detailed description of the preferred embodiments of the present utility model will be given with reference to the accompanying drawings.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a front view of the present utility model.

Fig. 2 is a vertical sectional view of the present utility model.

Fig. 3 is a side view of the present utility model.

Fig. 4 is a top view of the present utility model.

Fig. 5 is a partial schematic view of the portion a in fig. 2.

Fig. 6 is a schematic diagram showing the relative positions of the first casing, the second casing and the third casing according to the present utility model.

In the figure: 1. a support assembly; 2. a limit component; 3. an elastic component; 4. a sensing control assembly; 5. a vertical piece; 6. an inclined end; 7. a vertical hole; 8. rotating the strip; 9. a support block; 10. a top block; 11. a rotating lever; 12. an anti-falling block; 13. a vertical block; 14. a slide hole; 15. a first casing; 16. a second casing; 17. a third casing; 18. a spring; 19. a first loop bar; 20. a second loop bar; 21. a third sleeve rod; 22. a distance sensor.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Embodiment one:

1-6, a device for measuring the width of a bridge crack comprises a supporting component 1, a limiting component 2, an elastic component 3 and a sensing control component 4; the limiting component 2 and the elastic component 3 are connected in the supporting component 1 up and down; the sensing and controlling assembly 4 is connected to the upper outer side of the supporting assembly 1.

In actual use, when it is desired to determine the width of a crack in a bridge work, the support assembly 1 is vertically placed in the crack. When the supporting component 1 stretches into the crack, the elastic component 3 is in a compressed state, and the elastic component 3 is matched with the limiting component 2 to maintain the vertical state of the supporting component 1. The sensing control assembly 4 can accurately acquire the data of the supporting assembly 1.

The distance measured by the sensing control component 4 is not the width of the crack, which needs to be simply added or subtracted according to the related parameters of the supporting component 1, and the application is not repeated because the distance is a matter of common knowledge.

The utility model does not need to take large-amplitude actions such as bending down and the like during reading, does not need manual reading, does not cause reading errors due to external conditions such as light and the like, and ensures the accuracy of measurement. The bridge crack measuring device is simple in structure and convenient to operate, and solves the problems that the existing bridge crack measuring device is inconvenient to operate manually and easy to bring measuring errors.

Embodiment two:

An apparatus for measuring the width of a crack of a bridge according to the embodiments shown in fig. 1, 2 and 4 is different from the embodiment in that: the supporting component 1 comprises a vertical piece 5, a rotating strip 8 and a supporting block 9; the two vertical plates 5 are arranged, and the two vertical plates 5 are oppositely arranged in parallel; the two sides of each vertical piece 5 are respectively connected with a rotating strip 8; the outer side of the lower end of each vertical piece 5 is provided with an inclined end 6 with a thick upper part and a thin lower part; the outer side wall of the middle part of each vertical piece 5 is fixedly connected with a supporting block 9; the upper side wall of each vertical plate 5 is provided with a vertical hole 7 for connecting the sensing control component 4.

In actual use, when it is desired to determine the width of a crack in a bridge work, two risers 5 are placed vertically in the crack until the support blocks 9 contact the deck. When the two vertical plates 5 extend into the crack, the springs 18 in the elastic component 3 are in a compressed state and are matched with the limiting component 2, so that the two vertical plates 5 are kept in a parallel and vertical state. The distance sensor 22 in the sensing and controlling assembly 4 is connected to the upper portion of one of the vertical plates 5 for measuring the distance from the other vertical plate 5, then obtaining a measurement signal, and interpreting the measurement signal to accurately obtain the value of the width of the bridge crack.

In this embodiment, the two supporting blocks 9 are arranged to ensure the depth of the vertical piece 5 extending into the crack and effectively prevent the device from falling into the crack.

Embodiment III:

The device for measuring the width of a crack of a bridge according to one embodiment shown in fig. 2 and 4 is different from the second embodiment in that: the rotating strip 8 is an arc-shaped plate; the width of the arc-shaped plate is the same as the thickness of the vertical plate 5; the rotating strips 8 arranged on the two vertical plates 5 are both bent inwards and oppositely arranged.

In practical use, since the vertical piece 5 needs to extend into the crack, a scratch may occur in the crack, and in order to avoid damaging the limiting component 2 and the elastic component 3, a corresponding protection component needs to be arranged. The arrangement of the rotating strip 8 effectively prevents the damage of the limiting component 2 and the elastic component 3 to a certain extent.

Embodiment four:

an apparatus for measuring the width of a crack of a bridge according to the embodiments shown in fig. 1, 2 and 4 is different from the embodiment in that: the limiting assembly 2 comprises a top block 10, a rotating rod 11 and a vertical block 13; two rotating rods 11 are arranged; the middle parts of the two rotating rods 11 are crossed and rotatably connected, the upper ends of the two rotating rods 11 are rotatably connected to the opposite inner side walls of the supporting component 1 through top blocks 10 respectively, and the lower ends of the two rotating rods 11 are slidably connected to the opposite inner side walls of the supporting component 1 through vertical blocks 13 respectively.

In actual use, when the two vertical plates 5 are vertically placed into the crack, and the supporting blocks 9 are contacted with the bridge deck, the two rotating rods 11 are centered on the middle intersection point, the upper ends of the rotating rods are inwards close, and the lower ends of the rotating rods slide downwards along the vertical blocks 13.

Fifth embodiment:

An apparatus for measuring a width of a crack of a bridge according to one embodiment shown in fig. 1 and 2 is different from the fourth embodiment in that: the top block 10 is composed of two semicircular arc plates; the two semicircular arc plates are connected to the inner side wall of the supporting component 1 in parallel; round through holes are formed in each semicircular arc plate, and a cross rod is horizontally connected between the two round through holes; the upper end of the rotating rod 11 is rotatably connected to the cross bar.

When in actual use, after the two vertical plates 5 are vertically placed into the crack, the top ends of the two rotating rods 11 rotate around the cross rod, so that the top ends of the two rotating rods 11 are close to each other, the two vertical plates 5 are kept parallel and vertical under the cooperation of the elastic component 3, and the accuracy of a measurement result is ensured.

Example six:

An apparatus for measuring a width of a crack of a bridge according to one embodiment shown in fig. 1 and 2 is different from the fourth embodiment in that: the vertical block 13 is of a cuboid structure; the vertical block 13 is provided with a strip-shaped sliding hole 14 along the axial direction, and the lower end of the rotating rod 11 can slide up and down along the strip-shaped sliding hole 14; the lower end of the rotating rod 11 is provided with an anti-falling block 12.

In actual use, after the two vertical plates 5 are vertically put into the crack, the bottom ends of the two rotating rods 11 slide downwards along the strip-shaped sliding holes 14 on the vertical blocks 13 so as to ensure the parallelism and the verticality of the two vertical plates 5.

In a specific application, when the spring 18 is in a natural stretched state, the bottom end of the rotating rod 11 is just at the top of the bar-shaped sliding hole 14.

When the anti-drop device is applied to the automobile, the bottom end of the rotating rod 11 is arranged on one side of the sliding hole 14, the anti-drop block 12 is arranged on the other side of the strip-shaped sliding hole 14, and the anti-drop block 12 is connected with the bottom end of the rotating rod 11 through the sliding hole 14, so that the lower end of the rotating rod 11 is stably connected to the sliding hole 14, and the sliding hole 14 cannot be deviated due to the up-and-down sliding of the lower end of the rotating rod 11.

Embodiment seven:

An apparatus for measuring the width of a crack of a bridge according to the embodiments shown in fig. 1, 2, 5 and 6 is different from the embodiment in that: the elastic component 3 comprises a shell, a spring 18 and a loop bar; the casing, the spring 18 and the loop bar are all horizontally connected to the side walls of the support assembly 1 which are oppositely arranged; the spring 18 is sleeved on the loop bar, and the sleeve is sleeved outside the spring 18.

In actual use, after the two vertical plates 5 are vertically placed into the crack, the springs 18 are compressed, and the casing and the loop bar are also compressed under the drive of the springs 18, so that the two vertical plates 5 are parallel and vertical, and the accuracy of measured data is ensured.

Example eight:

An apparatus for measuring a width of a crack of a bridge according to the embodiments shown in fig. 2, 5 and 6 is different from the seventh embodiment in that: the casing comprises a first casing 15, a second casing 16 and a third casing 17, two ends of the second casing 16 are respectively sleeved in the first casing 15 and the third casing 17, and the second casing 16 can slide in the first casing 15 and the third casing 17; the loop bars comprise a first loop bar 19, a second loop bar 20 and a third loop bar 21, and the first loop bar 19, the second loop bar 20, the third loop bar 21 and the second loop bar 20 can slide relatively.

Further, a plurality of bumps are provided on an outer sidewall of one end of the second casing 16, and a slideway corresponding to the bump on the second casing 16 is provided on an inner sidewall of the first casing 15; the outer side wall of one end of the third casing 17 is provided with a plurality of protruding blocks, and the inner side wall of the second casing 16 is provided with a slideway corresponding to the protruding blocks on the third casing 17.

In actual use, when the two vertical plates 5 are vertically placed into the slit, the springs 18 are compressed, and the first sleeve 15, the second sleeve 16, the third sleeve 17, the first sleeve rod 19, the second sleeve rod 20 and the third sleeve rod 21 are all closed inwards under the driving of the springs 18. Thereby guaranteeing that the outer side walls of the two vertical plates 5 are closely attached to the inner side walls of the bridge cracks, and guaranteeing the accuracy of measurement data.

Example nine:

an apparatus for measuring the width of a crack of a bridge according to the embodiment shown in fig. 1 to 3 is different from the embodiment in that: the sensing control component 4 comprises a distance sensor 22, a connecting seat and a receiving end; the distance sensor 22 is connected to the supporting component 1 through a connecting seat; the distance sensor 22 is electrically connected to the receiving end.

In actual use, distance data between the two vertical plates 5 are acquired through the distance sensor 22, the data are sent to the receiving end, and the actual width of the bridge crack is obtained through calculation of the receiving end. The operation personnel do not need to bend down and the like to perform large-amplitude actions, manual reading is not needed, reading errors caused by external conditions such as light rays and the like are avoided, and the measuring accuracy is ensured.

Example ten:

An apparatus for measuring the width of a crack of a bridge according to the embodiment shown in fig. 1 to 6 is different from the embodiment in that: the supporting component 1 comprises a vertical piece 5, a rotating strip 8 and a supporting block 9; the two vertical plates 5 are arranged, and the two vertical plates 5 are oppositely arranged in parallel; the two sides of each vertical piece 5 are respectively connected with a rotating strip 8; the outer side of the lower end of each vertical piece 5 is provided with an inclined end 6 with a thick upper part and a thin lower part; the outer side wall of the middle part of each vertical piece 5 is fixedly connected with a supporting block 9; a vertical hole 7 for connecting the sensing control component 4 is formed on the side wall of the upper part of each vertical piece 5; the rotating strip 8 is an arc-shaped plate; the width of the arc-shaped plate is the same as the thickness of the vertical plate 5; the rotating strips 8 arranged on the two vertical plates 5 are inwards bent and oppositely arranged; the limiting assembly 2 comprises a top block 10, a rotating rod 11 and a vertical block 13; two rotating rods 11 are arranged; the middle parts of the two rotating rods 11 are crossed and rotatably connected, the upper ends of the two rotating rods 11 are rotatably connected to the opposite inner side walls of the two vertical plates 5 in the support assembly 1 through the jacking blocks 10 respectively, and the lower ends of the two rotating rods 11 are slidably connected to the opposite inner side walls of the support assembly 1 through the vertical blocks 13 respectively; the top block 10 is composed of two semicircular arc plates; the two semicircular arc plates are connected to the inner side wall of the supporting component 1 in parallel; round through holes are formed in each semicircular arc plate, and a cross rod is horizontally connected between the two round through holes; the upper end of the rotating rod 11 is rotatably connected to the cross rod; the vertical block 13 is of a cuboid structure; the vertical block 13 is provided with a line through hole along the axial direction, and the lower end of the rotating rod 11 can slide up and down along the line through hole; the lower end of the rotating rod 11 is provided with an anti-falling block 12; the elastic component 3 comprises a shell, a spring 18 and a loop bar; the casing, the spring 18 and the loop bar are all horizontally connected to the side walls of each vertical plate 5 of the supporting assembly 1 which are oppositely arranged; the spring 18 is sleeved on the loop bar, and the sleeve is sleeved outside the spring 18; the casing comprises a first casing 15, a second casing 16 and a third casing 17, two ends of the second casing 16 are respectively sleeved in the first casing 15 and the third casing 17, and the second casing 16 can slide in the first casing 15 and the third casing 17; the loop bar comprises a first loop bar 19, a second loop bar 20 and a third loop bar 21, wherein the first loop bar 19 and the second loop bar 20, and the third loop bar 21 and the second loop bar 20 can slide relatively; the outer side wall of one end of the second casing 16 is provided with a plurality of protruding blocks, and the inner side wall of the first casing 15 is provided with a slideway corresponding to the protruding blocks on the second casing 16; a plurality of protruding blocks are arranged on the outer side wall of one end of the third casing 17, and a slideway corresponding to the protruding blocks on the third casing 17 is arranged on the inner side wall of the second casing 16; the sensing control assembly 4 comprises a distance sensor 22, a connecting seat and a receiving end; the distance sensor 22 is connected to the upper part of the vertical piece 5 in the supporting component 1 through a connecting seat; the distance sensor 22 is electrically connected to the receiving end.

When it is desired to determine the width of the crack in the bridge work, two vertical plates 5 are vertically placed in the crack until the supporting blocks 9 contact the deck. When the two vertical plates 5 extend into the crack, the springs 18 in the elastic component 3 are in a compressed state and are matched with the limiting component 2, so that the two vertical plates 5 are kept in a parallel and vertical state. The distance sensor 22 in the sensing control assembly 4 is connected to the upper part of one of the vertical plates 5, and is used for measuring the distance between the vertical plates 5 and the other vertical plate, then obtaining a measuring signal, and accurately obtaining the crack width of the bridge through simple calculation.

The utility model does not need to take large-amplitude actions such as bending down and the like during reading, does not need manual reading, does not cause reading errors due to external conditions such as light and the like, and ensures the accuracy of measurement.

The bottom end of the vertical piece is provided with the inclined end, so that the vertical piece can be conveniently and rapidly inserted into the crack.

According to the utility model, the elastic assembly formed by the casing, the spring and the loop bar ensures that the two vertical plates are always in a vertical and parallel state under the cooperation of the limiting assembly, and ensures the accuracy of the measured seam width.

According to the utility model, the outer side walls of one ends of the second casing and the third casing are respectively provided with a plurality of convex blocks, and the inner side walls of the first casing and the second casing are respectively provided with the sliding ways corresponding to the convex blocks on the second casing and the third casing, so that the first casing, the second casing and the third casing are effectively prevented from relative rotation around the round mandrel, and the two vertical sheets are ensured to be always in a mutually parallel state.

The bridge crack measuring device is simple in structure and convenient to operate, and solves the problems that the existing bridge crack measuring device is inconvenient to operate manually and easy to bring measuring errors.

Under the condition of no conflict, the technical features related to the examples can be combined with each other according to actual situations by a person skilled in the art so as to achieve corresponding technical effects, and specific details of the combination situations are not described in detail herein.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.

Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature.

While the utility model is susceptible of embodiments in accordance with the preferred embodiments, the utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein. Any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present utility model still fall within the scope of the technical solution of the present utility model.

Claims (10)

1. A device for measuring bridge crack width, characterized in that: comprises a supporting component (1), a limiting component (2), an elastic component (3) and a sensing control component (4); the limiting component (2) and the elastic component (3) are connected in the supporting component (1) up and down; the sensing control assembly (4) is connected to the outer side of the upper part of the supporting assembly (1).

2. A device for measuring the width of a crack in a bridge as claimed in claim 1, wherein: the supporting component (1) comprises a vertical plate (5), a rotating strip (8) and a supporting block (9); the two vertical plates (5) are arranged in parallel, and the two vertical plates (5) are oppositely arranged; the two sides of each vertical piece (5) are respectively connected with a rotating strip (8); the outer side of the lower end of each vertical piece (5) is provided with an inclined end (6) with a thick upper part and a thin lower part; the outer side wall of the middle part of each vertical piece (5) is fixedly connected with a supporting block (9); a vertical hole (7) for connecting the sensing control component (4) is formed in the side wall of the upper part of each vertical plate (5).

3. An apparatus for measuring the width of a crack in a bridge as claimed in claim 2, wherein: the rotating strip (8) is an arc-shaped plate; the width of the arc-shaped plate is the same as the thickness of the vertical plate (5); the rotating strips (8) arranged on the two vertical plates (5) are both inwards bent and oppositely arranged.

4. A device for measuring the width of a crack in a bridge as claimed in claim 1, wherein: the limiting assembly (2) comprises a top block (10), a rotating rod (11) and a vertical block (13); two rotating rods (11) are arranged; the middle parts of the two rotating rods (11) are crossed and rotatably connected, the upper ends of the two rotating rods (11) are rotatably connected to the opposite inner side walls of the supporting component (1) through top blocks (10), and the lower ends of the two rotating rods (11) are slidably connected to the opposite inner side walls of the supporting component (1) through vertical blocks (13).

5. An apparatus for measuring the width of a crack in a bridge as in claim 4, wherein: the top block (10) is composed of two semicircular arc plates; the two semicircular arc plates are connected to the inner side wall of the supporting component (1) in parallel; round through holes are formed in each semicircular arc plate, and a cross rod is horizontally connected between the two round through holes; the upper end of the rotating rod (11) is rotatably connected to the cross rod.

6. An apparatus for measuring the width of a crack in a bridge as in claim 4, wherein: the vertical block (13) is of a cuboid structure; the vertical block (13) is provided with a strip-shaped sliding hole (14) along the axial direction, and the lower end of the rotating rod (11) can slide up and down along the strip-shaped sliding hole (14); the lower end of the rotating rod (11) is provided with an anti-falling block (12).

7. A device for measuring the width of a crack in a bridge as claimed in claim 1, wherein: the elastic component (3) comprises a shell, a spring (18) and a loop bar; the sleeve shell, the spring (18) and the loop bar are horizontally connected to the side walls of the supporting component (1) which are oppositely arranged; the spring (18) is sleeved on the loop bar, and the sleeve is sleeved outside the spring (18).

8. An apparatus for measuring the width of a crack in a bridge as in claim 7, wherein: the casing comprises a first casing (15), a second casing (16) and a third casing (17), wherein two ends of the second casing (16) are respectively sleeved in the first casing (15) and the third casing (17), and the second casing (16) can slide in the first casing (15) and the third casing (17); the loop bar comprises a first loop bar (19), a second loop bar (20) and a third loop bar (21), wherein the first loop bar (19) and the second loop bar (20), and the third loop bar (21) and the second loop bar (20) can slide relatively.

9. An apparatus for measuring the width of a crack in a bridge as in claim 8, wherein: the outer side wall of one end of the second casing (16) is provided with a plurality of protruding blocks, and the inner side wall of the first casing (15) is provided with a slideway corresponding to the protruding blocks on the second casing (16); a plurality of protruding blocks are arranged on the outer side wall of one end of the third casing (17), and a slideway corresponding to the protruding blocks on the third casing (17) is arranged on the inner side wall of the second casing (16).

10. A device for measuring the width of a crack in a bridge as claimed in claim 1, wherein: the sensing control assembly (4) comprises a distance sensor (22), a connecting seat and a receiving end; the distance sensor (22) is connected to the supporting component (1) through a connecting seat; the distance sensor (22) is electrically connected with the receiving end.