Measuring device and method for municipal engineering bridge construction

Abstract

The invention relates to the technical field of bridge construction equipment, in particular to a measuring device and method for municipal engineering bridge construction.The front end of a laser range finder body is provided with a limiting assembly, the limiting assembly comprises a driving plate and a calibration plate, the driving plate is located in front of the laser range finder body, and the calibration plate is located at the front end of the laser range finder body; compared with the defects that a vernier caliper cannot extend into a deep seam and a feeler gauge needs to adapt to specifications one by one, the calibration plate of the device can be directly inserted into an expansion joint or the inner wall of a groove, the limiting plate flexibly stretches out and draws back along with the driving plate, and the device can adapt to measurement scenes with different widths without replacing tools; the driving plate and the limiting plate are integrally designed, so that the movement synchronism of the driving plate and the limiting plate is ensured, the alignment deviation caused by a split structure is avoided, and the measurement requirements of various small positions such as expansion joints and grooves in bridge construction are met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bridge construction equipment, in particular to a measuring device and method for municipal engineering bridge construction. BACKGROUND

[0002] In the municipal engineering bridge construction, the measurement accuracy of the expansion joint width, the groove width and other positions directly affects the overall construction quality and service life of the bridge. The expansion joint needs to match the thermal expansion and cold contraction requirements of the bridge. A large width deviation can cause the bridge deck to crack and rainwater to leak. If the drainage hole diameter does not match, it can easily cause water to accumulate on the bridge deck and accelerate the corrosion of the structure.

[0003] In current bridge construction, handheld laser range finders are commonly used tools for measuring such small positions due to their portability and high short-distance measurement accuracy (usually ±1mm). However, existing handheld laser range finders lack auxiliary limiting structures. Small positions such as expansion joints are often located in the gaps or corners of the bridge deck. The handheld laser range finder cannot be placed above the expansion joint to accurately measure the width of the expansion joint.

[0004] In addition, although tools such as vernier calipers and feeler gauges can achieve high-precision measurement, vernier calipers are limited by the measurement space (e.g., they cannot be inserted into deep joints or narrow corners). Feelers need to be adapted to different width specifications one by one, which is cumbersome and has poor adaptability. SUMMARY

[0005] Technical problems to be solved To overcome the deficiencies of the prior art, the present application provides a measuring device and method for municipal engineering bridge construction.

[0006] Technical scheme To achieve the above-mentioned purpose, the present application provides the following technical scheme: a measuring device for municipal engineering bridge construction, comprising a laser range finder main body, a distance measuring probe is arranged at the front end of the laser range finder main body, and a limiting assembly is arranged at the front end of the laser range finder main body; The limiting assembly comprises a driving plate and a calibration plate. The driving plate is located in front of the laser range finder main body, and the calibration plate is located at the front end of the laser range finder main body and below the distance measuring probe. A first cylindrical block penetrates the calibration plate and is arranged at the front end of the laser range finder main body. A baffle is arranged in front of the distance measuring probe and a second cylindrical block penetrates the baffle and is arranged in the middle part of the driving plate. A limiting plate is also arranged in the middle part of the driving plate, located in front of the calibration plate and at the lower end of the baffle. Two housings are symmetrically arranged on the two sides of the laser range finder body, the inside of the housing is provided with a first empty slot, the inside of the first empty slot is provided with a first spring, one end of the first spring is fixed on the bottom of the first empty slot, the two ends of the driving plate are provided with support rods inserted into the inside of the first empty slot, the end of the support rod away from the driving plate is connected to the other end of the first spring, the inner wall of the first empty slot is provided with a clamping groove, the outer wall of the support rod is provided with a cavity, the third spring is arranged in the cavity, one end of the third spring is fixed in the cavity, the other end of the third spring is provided with a clamping block matched with the clamping groove; The housing is provided with a pressing plate on the outside, two second empty slots are symmetrically arranged on the upper end and the lower end of the housing, the second empty slot is provided with a second spring, one end of the second spring is fixed on the bottom end of the second empty slot, the two ends of the pressing plate are provided with limiting rods inserted into the inside of the second empty slot and connected to the other end of the second spring, the middle part of the pressing plate is provided with a push rod penetrating through the clamping groove. The lower end of the laser range finder body is fixedly provided with a laser positioning assembly, and the laser positioning assembly is located at the front end of the laser range finder body, and the lower end of the laser positioning assembly is provided with a laser emitter.

[0007] In order to improve the stability of the structure during use, the improvement of the present application has a plurality of height-adjustable support assemblies arranged at the four corners of the lower end of the laser range finder body, the support assembly comprises a bottom block and a support rod, the four corners of the lower end of the laser range finder body are provided with through holes, the support rod is fixed on the upper end of the bottom block, and the support rod is inserted into the through hole and threadedly connected with the laser range finder body.

[0008] In order to make the structure convenient to store, the improvement of the present application has that the calibration plate is rotationally connected with the first cylindrical block, the front end of the first cylindrical block is provided with a first locking cap, the first locking cap is buckled on the front end of the first cylindrical block to limit the calibration plate, the first locking cap is threadedly connected with the first cylindrical block, the second cylindrical block is rotationally connected with the baffle, the front end of the second cylindrical block is provided with a second locking cap, the second locking cap is buckled on the front end of the second cylindrical block to limit the baffle, and the second locking cap is threadedly connected with the baffle.

[0009] Further, the improvement of the present application has that the driving plate and the limiting plate are an integrated structure.

[0010] Further, the improvement of the present application has that the clamping block is an isosceles trapezoidal structure.

[0011] A use method of a measuring device for municipal engineering bridge construction, comprising the following steps: Step 1: initial state inspection and component adjustment; Confirming that the laser range finder body is in an unmeasuring state, at this time, the calibration plate is in a horizontal state below the ranging probe, the baffle is in a horizontal state in the middle part of the driving plate, the second locking cap is buckled on the front end of the second cylindrical block to limit the baffle, and the first locking cap is buckled on the front end of the first cylindrical block to limit the calibration plate; If measurement is needed, first, the first locking cap is rotated to release the limitation on the calibration plate, the calibration plate is rotated around the first cylindrical block to a vertical downward state, and then the first locking cap is reversely rotated to lock the calibration plate; then, the second locking cap is rotated to release the limitation on the baffle, the baffle is rotated around the second cylindrical block to a vertical upward state, and then the second locking cap is reversely rotated to lock the baffle, so that the baffle is located in front of the ranging probe; Step 2: measurement positioning; The calibration plate is inserted into one of the inner walls of the expansion joint or groove to be measured, and it is ensured that the ranging probe is located directly above the inner wall; The laser positioning assembly is started, the laser emitter emits a positioning laser beam to the ground, the position of the laser range finder body is adjusted, the positioning laser beam is aligned with the reference inner wall of the expansion joint or groove, and the measurement positioning is completed; Step 3: limiting and fixing and width measurement; The pressing plates on the outer sides of the housings on both sides of the laser range finder body are pressed at the same time, the pressing plates drive the push rods to penetrate the clamping grooves and push the clamping blocks in the cavities of the outer walls of the supporting rods, so that the clamping blocks are separated from the clamping grooves in the inner walls of the first cavities under the action of the third springs; After the clamping blocks are separated, the first springs in the compressed first cavities release the elastic force, the supporting rods are pushed out in the first cavities, and then the driving plate and the integrated limiting plate are moved to the other inner wall of the expansion joint or groove until the limiting plate is attached to the inner wall; At this time, the inner wall of the baffle is aligned with the inner wall to which the limiting plate is attached, the control button on the laser range finder body is pressed, the ranging probe measures the distance between the ranging probe and the baffle, and the distance is the width of the expansion joint or groove.

[0012] Further, the improvement of the present application further comprises a placing stability adjustment and storage step of the laser range finder body, and the specific steps are as follows: Step A: placing stability adjustment; The laser range finder body is placed on the plane of the bridge construction measurement area, if the placing surface is not flat, the bottom blocks at the four corners of the lower end of the laser range finder body are rotated clockwise to drive the supporting rods to descend in the through holes of the laser range finder body, or the bottom blocks are counterclockwise to drive the supporting rods to ascend, the heights of the four bottom blocks are adjusted one by one, and the laser range finder body is kept horizontal and stable; Step B: device storage; After the measurement is completed, the pressing plates are pressed first to compress the first springs and reset the supporting rods, the clamping blocks are re-inserted into the clamping grooves under the action of the third springs, and the driving plate is retracted to the initial position; Then rotate the first and second locking caps to return the calibration plate and the baffle to a horizontal position, respectively, and reposition them using the locking caps. Finally, rotate all the bottom blocks clockwise to make them fit against the lower end of the laser rangefinder body, completing the storage.

[0013] Beneficial effects Compared with the prior art, the present invention provides a measuring device and method for bridge construction in municipal engineering, which has the following beneficial effects: Compared to the limitations of vernier calipers ("cannot be inserted into deep seams") and feeler gauges ("requires individual size matching"), the calibration plate of this device can be directly inserted into the inner wall of expansion joints or grooves. The limiting plate extends and retracts flexibly with the drive plate, adapting to measurement scenarios of different widths without the need to change tools. The integrated design of the drive plate and the limiting plate ensures the synchronization of their movements, avoiding alignment deviations caused by separate structures, and adapting to the measurement needs of various small locations such as expansion joints and grooves in bridge construction.

[0014] The housing and the internal spring assembly form an "elastic drive structure": the first spring provides a stable elastic force to push the support rod, ensuring that the limiting plate fits tightly with the inner wall without excessive compression, protecting the surface of the component being tested from damage; the second spring provides a reset elastic force for the pressure plate, which can automatically spring back after pressing, simplifying the operation steps. Attached Figure Description

[0015] Figure 1 This is a first-view three-dimensional structural diagram of the present invention; Figure 2 This is a second-view three-dimensional structural diagram of the present invention; Figure 3 For the present invention Figure 1 The main view; Figure 4 For the present invention Figure 1 A magnified schematic diagram of the local structure at point A; Figure 5 This is a schematic diagram of the mounting structure of the first spring and the third spring in this invention; Figure 6 This is a schematic diagram of the mounting structure of the second spring in this invention; In the diagram: 1. Main body of the laser rangefinder; 2. Rangefinder probe; 3. Calibration plate; 4. First cylindrical block; 5. First locking cap; 6. Drive plate; 7. Limiting plate; 8. Baffle; 9. Second cylindrical block; 10. Second locking cap; 11. Support rod; 12. Housing; 13. First slot; 14. First spring; 15. Cavity; 16. Locking block; 17. Push rod; 18. Pressure plate; 19. Second slot; 20. Limiting rod; 21. Second spring; 22. Third spring; 23. Laser positioning assembly; 24. Laser emitter; 25. Base block; 26. Support rod; 27. Locking slot. Detailed Implementation

[0016] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0017] Please refer to Figures 1-6 The measuring device for municipal engineering bridge construction comprises a laser range finder main body 1, a ranging probe 2 is arranged at the front end of the laser range finder main body 1, and a limiting assembly is arranged at the front end of the laser range finder main body 1. The limiting assembly comprises a driving plate 6 and a calibration plate 3. The driving plate 6 is located in front of the laser range finder main body 1, the calibration plate 3 is located at the front end of the laser range finder main body 1 and below the ranging probe 2, the front end of the laser range finder main body 1 is provided with a first cylindrical block 4 penetrating through the calibration plate 3, the middle part of the driving plate 6 is provided with a baffle 8 located in front of the ranging probe 2 and a second cylindrical block 9 penetrating through the baffle 8, and the middle part of the driving plate 6 is further provided with a limiting plate 7 located in front of the calibration plate 3 and at the lower end of the baffle 8. Two housings 12 are symmetrically arranged at the two sides of the laser range finder main body 1, a first hollow groove 13 is arranged in the housing 12, a first spring 14 is arranged in the first hollow groove 13, one end of the first spring 14 is fixed to the bottom of the first hollow groove 13, the two ends of the driving plate 6 are provided with support rods 11 inserted into the first hollow groove 13, the ends of the support rods 11 away from the driving plate 6 are connected to the other end of the first spring 14, a clamping groove 27 is arranged on the inner wall of the first hollow groove 13, a cavity 15 is arranged on the outer wall of the support rod 11, a third spring 22 is arranged in the cavity 15, one end of the third spring 22 is fixed to the inside of the cavity 15, and the other end of the third spring 22 is provided with a clamping block 16 matched with the clamping groove 27. A pressing plate 18 is arranged outside the housing 12, two second hollow grooves 19 are symmetrically arranged at the upper end and the lower end of the housing 12, a second spring 21 is arranged in the second hollow groove 19, one end of the second spring 21 is fixed to the bottom end of the second hollow groove 19, limiting rods 20 are arranged at the two ends of the pressing plate 18 and inserted into the second hollow groove 19 and connected to the other end of the second spring 21, and a push rod 17 penetrating through the clamping groove 27 is arranged at the middle part of the pressing plate 18. A laser positioning assembly 23 is fixedly arranged at the lower end of the laser range finder main body 1 and located at the front end of the laser range finder main body 1, and a laser emitter 24 is arranged at the lower end of the laser positioning assembly 23.

[0018] The calibration plate 3 is rotationally connected with the first cylindrical block 4, the front end of the first cylindrical block 4 is provided with the first locking cap 5, the first locking cap 5 is buckled on the front end of the first cylindrical block 4 to limit the calibration plate 3, the first locking cap 5 is threadedly connected with the first cylindrical block 4, the second cylindrical block 9 is rotationally connected with the baffle 8, the front end of the second cylindrical block 9 is provided with the second locking cap 10, the second locking cap 10 is buckled on the front end of the second cylindrical block 9 to limit the baffle 8, and the second locking cap 10 is threadedly connected with the baffle 8.

[0019] The driving plate 6 and the limiting plate 7 are integrated.

[0020] The clamping block 16 is an isosceles trapezoidal structure.

[0021] A method for using a measuring device for municipal engineering bridge construction, comprising the following steps: Step 1: initial state inspection and component adjustment; Confirm that the laser range finder main body 1 is in an unmeasured state, at this time the calibration plate 3 is in a horizontal state below the ranging probe 2, the baffle 8 is in a horizontal state in the middle part of the driving plate 6, the second locking cap 10 is buckled on the front end of the second cylindrical block 9 to limit the baffle 8, and the first locking cap 5 is buckled on the front end of the first cylindrical block 4 to limit the calibration plate 3; If measurement is required, first rotate the first locking cap 5 to release the limitation on the calibration plate 3, rotate the calibration plate 3 around the first cylindrical block 4 to a vertical downward state, then reverse the first locking cap 5 to lock the calibration plate 3, then rotate the second locking cap 10 to release the limitation on the baffle 8, rotate the baffle 8 around the second cylindrical block 9 to a vertical upward state, reverse the second locking cap 10 to lock the baffle 8, and make the baffle 8 located in front of the ranging probe 2; Step 2: measurement positioning; Insert the calibration plate 3 into one of the inner walls of the expansion joint or groove to be measured, and ensure that the ranging probe 2 is located directly above the inner wall; Start the laser positioning assembly 23, make the laser emitter 24 irradiate a positioning laser beam to the ground, adjust the position of the laser range finder main body 1, make the positioning laser beam aligned with the reference inner wall of the expansion joint or groove, and complete the measurement positioning; Step 3: limiting and fixing and width measurement; Press the pressing plate 18 outside the shell 12 on both sides of the laser range finder main body 1 at the same time, the pressing plate 18 drives the push rod 17 to penetrate the clamping groove 27 and push the clamping block 16 in the cavity 15 of the outer wall of the supporting rod 11, so that the clamping block 16 is separated from the clamping groove 27 in the first inner wall of the first slot 13 under the action of the third spring 22; After the block 16 is detached, the compressed first spring 14 in the first slot 13 releases the elastic force, pushes the support rod 11 to pop out in the first slot 13, and further drives the driving plate 6 and the integrated limiting plate 7 to move towards the other inner wall of the expansion joint or groove until the limiting plate 7 is attached to the inner wall. At this time, the inner wall of the baffle 8 attached to the limiting plate 7 is aligned, the control button on the laser range finder body 1 is pressed, the distance between the distance measuring probe 2 and the baffle 8 is measured, and the distance is the width of the expansion joint or groove.

[0022] It also includes a placement stability adjustment and storage step of the laser range finder body 1, which is as follows: Step A: placement stability adjustment; Place the laser range finder body 1 on the plane of the bridge construction measurement area. If the placement surface is not flat, rotate the bottom block 25 at the lower end of the four corners of the laser range finder body 1 clockwise to drive the support rod 26 to descend in the through hole of the laser range finder body 1, or rotate the bottom block 25 counterclockwise to drive the support rod 26 to ascend, adjust the height of the four bottom blocks 25 one by one, and keep the laser range finder body 1 horizontal and stable. Step B: device storage; After the measurement is completed, first press the pressing plate 18 to compress the first spring 14 to reset, and the block 16 is reinserted into the card slot 27 under the action of the third spring 22, and the driving plate 6 is retracted to the initial position; Then rotate the first locking cap 5 and the second locking cap 10 to rotate the calibration plate 3 back to the horizontal state and the baffle 8 back to the horizontal state respectively, and reposition with the locking cap. Finally, rotate all the bottom blocks 25 clockwise so that the bottom blocks 25 are attached to the lower end of the laser range finder body 1, and the storage is completed.

[0023] Initial state adjustment: First, confirm that the device is in an unmeasured state: at this time, the calibration plate 3 is attached to the front end of the laser range finder body 1, located below the distance measuring probe 2 in a horizontal state, the baffle 8 remains horizontal with the driving plate 6, the second locking cap 10 is buckled at the front end of the second cylindrical block 9 to limit the baffle 8, and the first locking cap 5 is buckled at the front end of the first cylindrical block 4 to limit the calibration plate 3.

[0024] If you need to start measurement, first rotate the first locking cap 5 to detach it from the first cylindrical block 4, release the constraint on the calibration plate 3, rotate the calibration plate 3 around the first cylindrical block 4 to the vertical downward state, then rotate the first locking cap 5 in the opposite direction to buckle it at the front end of the first cylindrical block 4 to lock the calibration plate 3; then rotate the second locking cap 10 to detach it from the second cylindrical block 9, release the constraint on the baffle 8, rotate the baffle 8 around the second cylindrical block 9 to the vertical upward state (at this time, the baffle 8 is directly opposite the front of the distance measuring probe 2), and rotate the second locking cap 10 in the opposite direction to buckle it at the front end of the second cylindrical block 9 to lock the baffle 8 position, complete the initial adjustment of the limiting assembly.

[0025] Placement stability adjustment: Place the laser range finder body 1 on the plane of the bridge construction measurement area. If the placement surface is not level, adjust the support assembly at the four corners of the lower end of the laser range finder body 1 to achieve horizontal stability: turn the bottom block 25 clockwise, which drives the support rod 26 fixed to the upper end of the bottom block 25 to move downward along the through hole of the laser range finder body 1; or turn the bottom block 25 counterclockwise, which drives the support rod 26 to move upward along the through hole, and adjust the height of each of the four bottom blocks 25 one by one until the laser range finder body 1 remains horizontal, avoiding the impact on measurement accuracy due to inclination.

[0026] Measurement positioning: Insert the calibration plate 3 into one of the inner walls of the expansion joint or groove to be measured, ensuring that the distance measuring probe 2 is directly above the inner wall; start the laser positioning assembly 23 at the front end of the laser range finder body 1, and the laser emitter 24 emits a positioning laser beam towards the ground; adjust the overall position of the laser range finder body 1 to make the positioning laser beam accurately aligned with the reference inner wall of the expansion joint or groove, further calibrating the measurement reference, avoiding errors caused by the insertion position deviation of the calibration plate 3.

[0027] Limiting and fixing and width measurement: Press the pressure plates 18 on both sides of the laser range finder body 1 simultaneously: the limiting rods 20 at both ends of the pressure plates 18 move downward along the second grooves 19 of the housings 12, compressing the second springs 21 inside the second grooves 19; the push rods 17 in the middle of the pressure plates 18 simultaneously penetrate the clamping grooves 27 of the housings 12, pushing the clamping blocks 16 inside the cavities 15 of the support rods 11 — the clamping blocks 16 compress the third springs 22 inside the cavities 15 under the action of the push rods 17, gradually disengaging from the clamping grooves 27 of the inner walls of the first grooves 13.

[0028] After the clamping blocks 16 completely disengage from the clamping grooves 27, the compressed first springs 14 inside the first grooves 13 release the elastic force, pushing the support rods 11 to pop out outward along the first grooves 13; the support rods 11 drive the driving plates 6 connected at their ends to move synchronously, as the driving plates 6 and the limiting plates 7 are integrated, the limiting plates 7 move closer to the other inner wall of the expansion joint or groove along with the driving plates 6, until the limiting plates 7 tightly fit the inner wall.

[0029] At this time, the inner wall of the baffle 8 that fits the limiting plate 7 is aligned, and the control button on the laser range finder body 1 is pressed, the distance measuring probe 2 measures the distance between itself and the baffle 8, which is the actual width of the expansion joint or groove.

[0030] Device storage and reset: After the measurement is completed, the two side pressing plates 18 are pressed first, the push rod 17 is pushed to compress the third spring 22 again to make the clamping block 16 retract, and the supporting rod 11 is pushed to compress the first spring 14, so that the driving plate 6 is pulled back to the initial position until the clamping block 16 is clamped into the clamping groove 27 again under the elastic force of the third spring 22, and the resetting of the driving plate 6 and the supporting rod 11 is completed. Then, the first locking cap 5 and the second locking cap 10 are rotated to rotate the calibration plate 3 back to the horizontal state around the first cylindrical block 4 and the baffle 8 back to the horizontal state around the second cylindrical block 9 respectively, and the locking caps are buckled again to limit the positions; finally, all the bottom blocks 25 are rotated clockwise to make the bottom blocks 25 drive the supporting rods 26 to move upward along the through holes until the bottom blocks 25 are attached to the lower end of the laser range finder main body 1, and the storage of the whole device is completed.

[0031] Multiple limiting + auxiliary positioning, completely solve the measurement deviation problem: The limiting assembly forms a "two-way positioning reference": the calibration plate 3 is inserted into one side of the inner wall, the limiting plate 7 is attached to the other side of the inner wall, and the integrated driving plate 6 ensures that the two are synchronized and positioned to avoid shaking deviation when handheld measurement; the first cylindrical block 4 and the second cylindrical block 9 respectively provide stable rotating shafts for the calibration plate 3 and the baffle 8, and the first locking cap 5 and the second locking cap 10 are connected by threads to achieve rigid limiting to prevent parts from shifting during measurement.

[0032] The laser positioning assembly 23 assists in calibration: the laser beam emitted by the laser emitter 24 can quickly align with the reference inner wall, making up for the error of relying on the naked eye to judge the insertion position of the calibration plate 3, and further improving the positioning accuracy; the clamping block 16 adopts an isosceles trapezoidal structure, and the inclined surface design can reduce the jamming when it is separated from the clamping groove 27, and the elastic resetting of the third spring 22 ensures smooth limiting and fixing process, avoiding measurement interruption caused by clamping block 16 jamming.

[0033] A plurality of height-adjustable supporting assemblies are arranged at the four corners of the lower end of the laser range finder main body 1, the supporting assembly comprises a bottom block 25 and a supporting rod 26, the four corners of the lower end of the laser range finder main body 1 are provided with through holes, the supporting rod 26 is fixed to the upper end of the bottom block 25, and the supporting rod 26 is inserted into the through hole and is in threaded connection with the laser range finder main body 1.

[0034] The supporting assembly at the lower end of the laser range finder main body 1 adopts a threaded cooperation structure of "bottom block 25 + supporting rod 26 + through hole", which can be flexibly adjusted according to the uneven ground of the bridge construction area (such as the unfinished area of bridge pavement and the temporary construction platform); the threaded connection between the supporting rod 26 and the laser range finder main body 1 ensures that there is no loosening after height adjustment, four supporting points form a stable supporting surface, avoiding measurement errors caused by unstable placement, and adapting to various site environments in bridge construction.

[0035] The laser emitter 24 adopts a green laser emitter 24. This model uses 515nm wavelength green light laser, the visual recognition degree is significantly better than the traditional red light in the outdoor strong light environment, 5mW output power meets CLASSIIIA safety standards, which can ensure the formation of clear and stable light spot within 10 meters, and can avoid damage to the eyes of construction personnel.

[0036] The distance measuring probe 2 adopts a Trimble GEDO Profiler laser distance measuring module; As the core component of the engineering level measurement, this model fully matches the high precision requirements of bridge construction. Its measurement range covers 0.3 meters to 30 meters, and in the typical measurement scene of expansion joints (usually 0.5-5 cm) and grooves, the accuracy can be stably maintained at ±1mm, far exceeding the accuracy level of traditional handheld distance meters. Using 905nm wavelength infrared laser beam, it has the natural advantage of anti-sunlight interference, and can still maintain signal stability in strong light environment at noon, avoiding the problem that visible light band is easily disturbed by stray light in outdoor environment.

[0037] Recommended material of the driving plate 6, the baffle 8 and the calibration plate 3: 6mm thick aluminum / low density polyethylene composite material (Alu / LDPE); This material is composed of two layers of 0.3mm aluminum plate sandwiched with LDPE, which forms an optimal balance between weight and rigidity, and its rigidity is increased by 40% compared with pure aluminum, and its weight is only 1 / 3 of the same thickness of steel plate. The damping characteristics of the sandwich structure can absorb the spring impact vibration during measurement, ensuring the synchronization of the limit plate 7 and the driving plate 6 integrated movement. In the description in this document, it should be noted that the relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment.

[0038] Although the embodiments of the present application have been shown and described, it can be understood by those of ordinary skill in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application.

Claims

1. A surveying device for municipal engineering bridge construction, comprising a laser range finder main body (1), the front end of the laser range finder main body (1) is provided with a ranging probe (2), characterized in that: The front end of the laser range finder body (1) is provided with a limiting assembly; The limiting assembly comprises a driving plate (6) and a calibration plate (3), the driving plate (6) is located in front of the laser range finder body (1), the calibration plate (3) is located at the front end of the laser range finder body (1) and below the ranging probe (2), the front end of the laser range finder body (1) is provided with a first cylindrical block (4) penetrating through the calibration plate (3), the middle part of the driving plate (6) is provided with a baffle (8) located in front of the ranging probe (2) and a second cylindrical block (9) penetrating through the baffle (8), and the middle part of the driving plate (6) is further provided with a limiting plate (7) located in front of the calibration plate (3) and at the lower end of the baffle (8). Two housings (12) are symmetrically arranged at the two sides of the laser range finder body (1), the inside of the housing (12) is provided with a first hollow groove (13), the inside of the first hollow groove (13) is provided with a first spring (14), one end of the first spring (14) is fixed at the bottom of the first hollow groove (13), the two ends of the driving plate (6) are provided with support rods (11) inserted into the inside of the first hollow groove (13), the end of the support rod (11) away from the driving plate (6) is connected to the other end of the first spring (14), the inner wall of the first hollow groove (13) is provided with a clamping groove (27), the outer wall of the support rod (11) is provided with a cavity (15), the cavity (15) is provided with a third spring (22), one end of the third spring (22) is fixed in the cavity (15), and the other end of the third spring (22) is provided with a clamping block (16) matched with the clamping groove (27). The outer side of the housing (12) is provided with a pressing plate (18), two second hollow grooves (19) are symmetrically arranged at the upper end and the lower end of the housing (12), the second hollow groove (19) is provided with a second spring (21), one end of the second spring (21) is fixed at the bottom end of the second hollow groove (19), the two ends of the pressing plate (18) are provided with limiting rods (20) inserted into the inside of the second hollow groove (19) and connected to the other end of the second spring (21), and the middle part of the pressing plate (18) is provided with a push rod (17) penetrating through the clamping groove (27). The lower end of the laser range finder body (1) is fixedly provided with a laser positioning assembly (23), and the laser positioning assembly (23) is located at the front end of the laser range finder body (1), and the lower end of the laser positioning assembly (23) is provided with a laser emitter (24).

2. The measuring device for municipal engineering bridge construction of claim 1, characterized in that: A plurality of height-adjustable support assemblies are arranged at the four corners of the lower end of the laser range finder body (1).

3. The measuring device for municipal engineering bridge construction of claim 2, characterized in that: The support assembly comprises a bottom block (25) and a support rod (26), the four corners of the lower end of the laser range finder body (1) are provided with through holes, the support rod (26) is fixed at the upper end of the bottom block (25), and the support rod (26) is inserted into the inside of the through hole and is threadedly connected with the laser range finder body (1).

4. The measuring device for municipal engineering bridge construction of claim 3, characterized in that: The calibration plate (3) is rotationally connected with the first cylindrical block (4), the front end of the first cylindrical block (4) is provided with a first locking cap (5), the first locking cap (5) is buckled on the front end of the first cylindrical block (4) to limit the calibration plate (3), the first locking cap (5) is threadedly connected with the first cylindrical block (4), the second cylindrical block (9) is rotationally connected with the baffle (8), the front end of the second cylindrical block (9) is provided with a second locking cap (10), the second locking cap (10) is buckled on the front end of the second cylindrical block (9) to limit the baffle (8), and the second locking cap (10) is threadedly connected with the baffle (8).

5. The surveying device for municipal engineering bridge construction of claim 4, characterized in that: The driving plate (6) and the limiting plate (7) are in an integrated structure.

6. The surveying device for municipal engineering bridge construction of claim 5, wherein: The clamping block (16) is in an isosceles trapezoidal structure.

7. A method of using a measuring device for municipal engineering bridge construction, for implementing the measuring device for municipal engineering bridge construction according to any one of claims 1-6, characterized in that: The method comprises the following steps: Step 1: initial state inspection and component adjustment; It is confirmed that the laser range finder main body (1) is in an unmeasured state, at this time, the calibration plate (3) is in a horizontal state below the ranging probe (2), the baffle (8) is in a horizontal state in the middle part of the driving plate (6), the second locking cap (10) is buckled on the front end of the second cylindrical block (9) to limit the baffle (8), and the first locking cap (5) is buckled on the front end of the first cylindrical block (4) to limit the calibration plate (3); If measurement is needed, the first locking cap (5) is first rotated to release the limitation on the calibration plate (3), the calibration plate (3) is rotated around the first cylindrical block (4) to a vertical downward state, the first locking cap (5) is reversely rotated to lock the calibration plate (3), then the second locking cap (10) is rotated to release the limitation on the baffle (8), the baffle (8) is rotated around the second cylindrical block (9) to a vertical upward state, the second locking cap (10) is reversely rotated to lock the baffle (8), and the baffle (8) is located in front of the ranging probe (2); Step 2: measurement positioning; The calibration plate (3) is inserted into one of the inner walls of the expansion joint or groove to be measured, and it is ensured that the ranging probe (2) is located directly above the inner wall; The laser positioning assembly (23) is started, the laser emitter (24) irradiates a positioning laser beam to the ground, the position of the laser range finder main body (1) is adjusted, the positioning laser beam is aligned with the reference inner wall of the expansion joint or groove, and measurement positioning is completed; Step 3: limiting and fixing and width measurement; The pressing plates (18) on the outer sides of the housings (12) on both sides of the laser range finder main body (1) are pressed at the same time, the pressing plates (18) drive the push rods (17) to penetrate the clamping grooves (27) and push the clamping blocks (16) in the cavities (15) of the outer walls of the supporting rods (11), so that the clamping blocks (16) are separated from the clamping grooves (27) in the inner walls of the first grooves (13) under the action of the third springs (22); After the clamping blocks (16) are separated, the first springs (14) in the compressed first grooves (13) release the elastic force, the supporting rods (11) are pushed out in the first grooves (13), and then the driving plate (6) and the integrated limiting plate (7) are moved to the other inner wall of the expansion joint or groove, until the limiting plate (7) is attached to the inner wall. At this time, the inner wall of the baffle (8) is aligned with the inner wall of the limiting plate (7), the control button on the laser range finder body (1) is pressed, the distance between the distance measuring probe (2) and the baffle (8) is measured, and the distance is the width of the expansion joint or the groove.

8. The method for using the measuring device for municipal engineering bridge construction according to claim 7, characterized in that, It also includes a stable placement adjustment and storage step of the laser range finder body (1), which is as follows: Step A: stable placement adjustment; Place the laser range finder body (1) on the plane of the bridge construction measurement area. If the placement surface is not flat, rotate the bottom block (25) at the lower end of the four corners of the laser range finder body (1) clockwise to lower the support rod (26) in the through hole of the laser range finder body (1), or rotate the bottom block (25) counterclockwise to raise the support rod (26), adjust the height of the four bottom blocks (25) one by one, and keep the laser range finder body (1) horizontal and stable. Step B: device storage; After measurement, first press the pressing plate (18) to compress the first spring (14) and reset the support rod (11), the clamping block (16) is re-clamped into the clamping groove (27) under the action of the third spring (22), and the driving plate (6) is retracted to the initial position. Then rotate the first locking cap (5) and the second locking cap (10) to return the calibration plate (3) to the horizontal state and the baffle (8) to the horizontal state, respectively, and reposition with the locking caps. Finally, rotate all the bottom blocks (25) clockwise to make the bottom blocks (25) adhere to the lower end of the laser range finder body (1), and complete the storage.

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