Large-span bridge cantilever closure vertical deformation detection equipment

Abstract

The invention relates to the technical field of bridge detection, and discloses a large-span bridge cantilever closure vertical deformation detection device which comprises telescopic vertical frame structures and sliding rail structures which are symmetrically arranged, telescopic transverse frame structures are arranged on one sides of the bottoms of the vertical frame structures, and a structure reinforcing mechanism is arranged between the vertical frame structures. A hoisting mechanism is arranged at the top of the structure reinforcing mechanism, a rotatable detection mechanism is arranged on the lower portion of the structure reinforcing mechanism, the sliding rail structure is installed on to-be-folded bridge cantilevers on the two sides through expansion bolts, and a moving mechanism is arranged at the end of the transverse frame structure. The detection mechanism slides on the sliding rail structure through the moving mechanism to detect the vertical deformation of the bridge cantilevers on the two sides, and the bridge cantilever detection device can be erected between the bridge cantilevers on the two sides for detection, can detect the vertical deformation of the folding positions of the cantilevers on the two sides in advance, and can be unfolded, arranged, stored and transported.

Description

Technical Field

[0001] This invention relates to the field of bridge inspection technology, specifically to a device for detecting vertical deformation during the closure of cantilevered sections of long-span bridges. Background Technology

[0002] During the jacking process of long-span cantilever bridges, steel plates are typically embedded at the chamfered corners of the top and web plates. Hydraulic jacks are used for jacking, and the longitudinal deformation of the closure joint is monitored throughout the process to track the jacking displacement in real time. However, the jacking force is not applied at the center of the cross-section. Due to the eccentric effect, vertical deformation of the cantilever end is inevitable during the jacking process. This vertical deformation of the cantilever end was neglected in the initial jacking force design calculations and actual construction, resulting in a longitudinal slope at the closure joint, uneven bridge alignment, a bridge condition that significantly deviates from the design, and changes in pavement thickness.

[0003] A search revealed Chinese patent CN220183806U, which discloses a cantilever mechanism and bridge inspection device that uses a visual inspection component to inspect the lower part of a bridge. However, it still has the following problems:

[0004] 1. It can only be set on one side of the bridge cantilever to detect that side of the bridge cantilever. When detecting the other side of the bridge cantilever, it needs to be reassembled and tested, which reduces the efficiency of the test.

[0005] 2. It is impossible to detect the vertical deformation at the junction of the cantilever arms on both sides in advance;

[0006] 3. The lack of an effective support structure in the telescopic pole assembly makes it difficult to guarantee the stability of the telescopic pole assembly, which to some extent will have an adverse impact on the results of the visual inspection component. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides a device for detecting vertical deformation during the closure of cantilever arms of long-span bridges, primarily to solve the problem of the inability to detect vertical deformation before the closure of bridge cantilever arms.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] A device for detecting vertical deformation during the closure of cantilever bridges in long spans includes symmetrically arranged retractable vertical frame structures and sliding rail structures. A retractable horizontal frame structure is provided on one side of the bottom of the vertical frame structure. A structural reinforcement mechanism is provided between the vertical frame structures. A hoisting mechanism is provided at the top of the structural reinforcement mechanism. A rotatable detection mechanism is provided at the bottom of the structural reinforcement mechanism. The sliding rail structure is installed on the two bridge cantilever bridges to be closed by expansion bolts. A moving mechanism is provided at the end of the horizontal frame structure. The detection mechanism detects the vertical deformation of the two bridge cantilever bridges by sliding on the sliding rail structure through the moving mechanism.

[0010] As a further embodiment of the present invention, the vertical frame structure includes a lower main column, and the lower main column has a lower sliding cavity inside. The upper part of the lower main column is slidably connected to a middle support column through the lower sliding cavity. The middle support column has a middle sliding cavity inside. The upper part of the middle support column is slidably connected to an upper column through the middle sliding cavity.

[0011] As a further embodiment of the present invention, the side walls of the lower main column, the middle support column and the upper column are all provided with through-hole positioning holes, and positioning pins are inserted into the positioning holes. The lower main column, the middle support column and the upper column are locked together by the positioning holes and the positioning pins.

[0012] As a further embodiment of the present invention, the crossbeam structure includes a main crossbeam welded and fixed to the side of the lower main column, and a middle crossbeam slidably connected to the end of the main crossbeam, and an end crossbeam inserted into the end of the middle crossbeam, and connecting columns welded between the symmetrically arranged main crossbeam, middle crossbeam and end crossbeam.

[0013] As a further embodiment of the present invention, a T-shaped groove is provided on the main crossbar, and an upper locking tooth is integrally formed on the top of the T-shaped groove. A lower locking tooth is integrally formed on the upper part of the middle crossbar. After the upper locking tooth and the lower locking tooth engage, the positions of the main crossbar and the middle crossbar are locked.

[0014] As a further embodiment of the present invention, longitudinal connecting ring 1 and transverse connecting ring 1 are welded to both sides of the lower main column and the upper end of the main horizontal column, respectively; longitudinal connecting ring 2 and transverse connecting ring 2 are welded to both sides of the middle support column and the upper end of the middle horizontal column, respectively; and longitudinal connecting ring 3 and transverse connecting ring 3 are welded to both sides of the upper column and the upper end of the end horizontal column, respectively. Steel wire ropes are connected between longitudinal connecting ring 1 and transverse connecting ring 1, between longitudinal connecting ring 2 and transverse connecting ring 2, and between longitudinal connecting ring 3 and transverse connecting ring 3.

[0015] As a further embodiment of the present invention, the structural reinforcement mechanism includes multiple main steel frames welded and fixed between the lower main columns, a connecting frame welded inside the main steel frame, a V-shaped support frame welded between two adjacent main steel frames, and a hoisting mechanism including a top plate welded to the uppermost main steel frame, and two sets of symmetrically arranged hoisting rings welded to the top plate.

[0016] As a further embodiment of the present invention, the detection mechanism includes a base plate welded to the lowest main steel frame, an electric push rod fixedly mounted on the output shaft of the stepper motor, and a laser emitter body fixedly mounted on the end of the electric push rod.

[0017] As a further embodiment of the present invention, the moving mechanism includes a bearing mounted on the side of the end column, and a roller is mounted on the outer ring of the bearing.

[0018] As a further embodiment of the present invention, the slide rail structure includes a rail body, a guide groove is provided at the upper end of the rail body, and the roller is disposed in the guide groove. A fixing plate is integrally formed on the lower side of both ends of the rail body, and a fixing through hole is provided on the fixing plate.

[0019] Compared with the prior art, the present invention provides a vertical deformation detection device for the cantilever closure of long-span bridges, which has the following advantages:

[0020] 1. The present invention uses a crane to place the entire device through two lifting rings on the lifting mechanism. After placement, the device can be erected on two bridge cantilever arms to be joined. The laser emitter scans the bridge cantilever arms on both sides, thereby detecting the vertical deformation of the bridge cantilever arms on both sides in advance. This allows construction personnel to adjust the joining point of the bridge cantilever arms on both sides in a timely manner, making the bridge more level after construction.

[0021] 2. The present invention uses a cross-frame structure composed of three interlocking cross-frames. The length of the cross-frame structure when folded is about 4 meters, and the maximum length when unfolded can reach 10 meters. The unfolded length of the cross-frame structure can be adjusted arbitrarily within this range, which improves its applicability. In addition, the vertical frame structure, together with steel wire ropes, can reinforce the unfolded cross-frame structure, thereby improving the stability of the overall structure.

[0022] 3. The present invention uses a moving mechanism set at the end of the end cross column to allow the entire device to slide along the installed steel rail body, thereby detecting vertical deformation along the bridge cantilever. The rollers are designed between the guide grooves, which can limit the extension and retraction of the end cross column to prevent the end cross column from moving. When the middle cross column is hoisted and reinforced with steel wire rope, the lower locking teeth of the middle cross column and the upper locking teeth of the main cross column will engage and lock.

[0023] 4. The hoisting mechanism of the present invention is designed on the upper part of the structural reinforcement mechanism. The main steel frame in the structural reinforcement mechanism is welded between the lower main columns, and connecting frames and V-shaped support frames are also welded between the main steel frames. Through the cooperation of the three types of frames, the overall strength of the device is improved during hoisting.

[0024] 5. This invention uses a detection mechanism to detect bridge cantilever. The detection mechanism is equipped with a stepper motor that drives the lower electric push rod to rotate, thereby detecting the vertical deformation of the bridge cantilever on both sides. The extension and retraction of the electric push rod can change the scanning height of the laser emitter. If the bridge cantilever on both sides is excessively deformed, the scanning point of the laser emitter will be inconsistent with the position of the cantilever on both sides, thus achieving the purpose of detection. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural diagram of the preferred embodiment of the present invention;

[0026] Figure 2 This is a three-dimensional structural diagram of the preferred embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of the slide rail structure;

[0028] Figure 4 This is a three-dimensional structural diagram of the vertical frame structure;

[0029] Figure 5 A schematic diagram of a three-dimensional structure in which the vertical and horizontal frames work together;

[0030] Figure 6 A three-dimensional structural diagram illustrating the coordination between the structural reinforcement mechanism and the testing mechanism.

[0031] In the diagram: 1. Vertical frame structure; 2. Horizontal frame structure; 3. Structural reinforcement mechanism; 4. Lifting mechanism; 5. Detection mechanism; 6. Moving mechanism; 7. Slide rail structure; 101. Lower main column; 102. Lower sliding cavity; 103. Middle support column; 104. Middle sliding cavity; 105. Upper column; 106. Positioning hole; 107. Positioning pin; 108. Longitudinal connecting ring one; 109. Longitudinal connecting ring two; 110. Longitudinal connecting ring three; 201. Main horizontal column; 202. Middle horizontal column; 203. End horizontal column; 204. Connecting column; 205. T 206. T-shaped chute; 207. Upper retaining tooth; 208. Lower retaining tooth; 209. Lateral connecting ring one; 210. Lateral connecting ring two; 211. Horizontal connecting ring three; 212. Steel wire rope; 301. Main steel frame; 302. Connecting frame; 303. V-shaped support frame; 401. Top plate; 402. Lifting ring; 501. Bottom plate; 502. Stepper motor; 503. Electric push rod; 504. Laser emitter body; 601. Bearing; 602. Roller; 701. Rail body; 702. Guide groove; 703. Fixing plate; 704. Fixing through hole. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0033] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0034] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0035] Reference Figures 1-6 A device for detecting vertical deformation during the closure of cantilever arms of a long-span bridge includes symmetrically arranged retractable vertical frame structures 1 and sliding rail structures 7. A retractable horizontal frame structure 2 is provided on one side of the bottom of the vertical frame structure 1. A structural reinforcement mechanism 3 is provided between the vertical frame structures 1. A hoisting mechanism 4 is provided at the top of the structural reinforcement mechanism 3. A rotatable detection mechanism 5 is provided at the bottom of the structural reinforcement mechanism 3. The sliding rail structure 7 is installed on the two bridge cantilever arms to be closed by expansion bolts. A moving mechanism 6 is provided at the end of the horizontal frame structure 2. The detection mechanism 5 detects the vertical deformation of the bridge cantilever arms on both sides by sliding on the sliding rail structure 7 through the moving mechanism 6.

[0036] In particular, in this invention, the vertical frame structure 1 includes a lower main column 101, and a lower sliding cavity 102 is provided inside the lower main column 101. A middle support column 103 is slidably inserted into the upper part of the lower main column 101 through the lower sliding cavity 102. A middle sliding cavity 104 is provided inside the middle support column 103. An upper column 105 is slidably connected to the upper part of the middle support column 103 through the middle sliding cavity 104. The upper column 105 is a solid column.

[0037] It should be noted that the side walls of the lower main column 101, the middle support column 103, and the upper column 105 are all provided with through-hole positioning holes 106. The positioning holes 106 are arranged at equal intervals. The positioning holes 106 are opened on both sides of the side walls of the lower main column 101 and the middle support column 103. Positioning pins 107 are inserted into the positioning holes 106. The lower main column 101, the middle support column 103, and the upper column 105 are locked by the positioning holes 106 and the positioning pins 107. The lower main column 101, the middle support column 103, and the upper column 105 can be locked to any amount of extension by the positioning pins 107, so as to be used in conjunction with the cross frame structure 2.

[0038] In particular, in this invention, the crossbeam structure 2 includes a main crossbeam 201 welded and fixed to the side of the lower main column 101, and a middle crossbeam 202 is slidably connected to the end of the main crossbeam 201. An end crossbeam 203 is inserted into the end of the middle crossbeam 202. A connecting column 204 is welded between the symmetrically arranged main crossbeam 201, middle crossbeam 202 and end crossbeam 203 to improve stability.

[0039] It should be noted that the main crossbar 201 is provided with a T-shaped groove 205, and the top of the T-shaped groove 205 is integrally formed with an upper locking tooth 206. The upper part of the middle crossbar 202 is integrally formed with a lower locking tooth 207. After the upper locking tooth 206 and the lower locking tooth 207 are engaged, the positions of the main crossbar 201 and the middle crossbar 202 are locked. The middle crossbar 202 is provided with a slot, and the end crossbar 203 is inserted through the slot.

[0040] In particular, in this invention, longitudinal connecting ring 108 and transverse connecting ring 208 are welded to both sides of the lower main column 101 and the upper end of the main horizontal column 201, respectively; longitudinal connecting ring 209 and transverse connecting ring 209 are welded to both sides of the middle support column 103 and the upper end of the middle horizontal column 202, respectively; and longitudinal connecting ring 310 and transverse connecting ring 3210 are welded to both sides of the upper column 105 and the upper end of the end horizontal column 203, respectively. Steel wire ropes 211 are connected between the first connecting ring 208, between the second longitudinal connecting ring 109 and the second transverse connecting ring 209, and between the third longitudinal connecting ring 110 and the third transverse connecting ring 210. After the first longitudinal connecting ring 108 and the second transverse connecting ring 208, the second longitudinal connecting ring 109 and the second transverse connecting ring 209, and the third longitudinal connecting ring 110 and the third transverse connecting ring 210 are connected by steel wire ropes 211, the stability of the cross frame structure 2 can be improved, making the whole device more robust.

[0041] It should be noted that the structural reinforcement mechanism 3 includes multiple main steel frames 301 welded and fixed between the lower main columns 101. A connecting frame 302 is welded inside the main steel frame 301, and a V-shaped support frame 303 is welded between two adjacent main steel frames 301. The hoisting mechanism 4 includes a top plate 401 welded to the uppermost main steel frame 301, and two sets of symmetrically arranged hoisting rings 402 are welded on the top plate 401. The hoisting rings 402 are used to connect to the crane, and the entire device is hoisted by the crane, which facilitates the installation of the device between the bridge cantilever on both sides. Through the cooperation of the three types of frames in the structural reinforcement mechanism 3, the overall strength of the device is improved during hoisting. Moreover, the three types of frames in the structural reinforcement mechanism 3 are all hollow materials, which helps to control the overall quality of the device.

[0042] In particular, in this invention, the detection mechanism 5 includes a base plate 501 welded to the lowest main steel frame 301, and a stepper motor 502 is bolted to the upper part of the base plate 501. An electric push rod 503 is fixedly installed on the output shaft of the stepper motor 502, and a laser emitter body 504 is fixedly installed at the end of the electric push rod 503. The extension and retraction of the electric push rod 503 can change the scanning height of the laser emitter body 504. The stepper motor 502 drives the lower electric push rod 503 to rotate. If the bridge cantilever on both sides is excessively deformed, the scanning point of the laser emitter body 504 will be inconsistent with the position of the cantilever on both sides. By manually comparing the relative position of the scanning point under the same extension and retraction length of the electric push rod 503, the deformation can be obtained, thereby adjusting the subsequent construction plan.

[0043] It should be noted that the moving mechanism 6 includes a bearing 601 mounted on the side of the end column 203, and a roller 602 is mounted on the outer ring of the bearing 601.

[0044] In particular, in this invention, the slide rail structure 7 includes a rail body 701, the upper end of the rail body 701 is provided with a guide groove 702, and the roller 602 is disposed in the guide groove 702. The lower sides of both ends of the rail body 701 are integrally formed with fixing plates 703, and fixing through holes 704 are provided on the fixing plates 703. The slide rail structure 7 can be installed on the bridges on both sides through the through holes on the fixing plates 703, so that the detection device can slide stably along the slide rail structure 7 to perform detection.

[0045] The present invention is used in the following steps:

[0046] S1: First, it is necessary to confirm the installation position of the sliding rail structure 7 on both sides of the bridge. The sliding rail structure 7 should be located about 0.5m away from the edge of both sides of the bridge for optimal condition. During installation, it should be installed as parallel as possible to the bridge surface where it is to be joined. After confirming the position, install it with expansion bolts.

[0047] S2: First, transport the entire device to the bridge on one side, and then symmetrically unfold the middle cross column 202 and end cross column 203 in the cross frame structure 2 on both sides. The unfolded length of the cross frame structure 2 on both sides should correspond to the slide rail structure 7 on both sides.

[0048] S3: Then, the vertical frame structure 1 is symmetrically unfolded by the crane and the construction personnel, and the positioning pins 107 are inserted into the positioning holes 106 to lock it. The number of positioning pins 107 should be as large as possible, and the positioning pins 107 should be inserted symmetrically and crosswise.

[0049] S4: After unfolding, the longitudinal connecting ring 108 and the transverse connecting ring 208, the longitudinal connecting ring 209 and the transverse connecting ring 209, and the longitudinal connecting ring 310 and the transverse connecting ring 3210 are connected by steel wire rope 211, so that the vertical frame structure 1 can distribute the load-bearing capacity of the horizontal frame structure 2 through the steel wire rope 211.

[0050] S5: Then, the two lifting rings 402 are connected by a crane, and the whole device is lifted to the bridge cantilever on both sides to be closed. Then, the rollers 602 in the moving mechanism 6 are inserted into the guide grooves 702, and the crane should not be separated from the lifting rings 402.

[0051] S6: Drive the laser emitter body 504 to rotate by stepper motor 502, and then compare whether the relative arm positions of the scanning points on both sides of the cantilever are consistent;

[0052] S7: The vertical deformation of the bridge cantilever on both sides is detected by manually pushing or using a tractor to move the entire device. The crane that has not detached in S5 can reduce the pressure on the moving mechanism 6 to a certain extent, so that the device can slide smoothly.

[0053] S8: After a height is detected, the height of the laser emitter body 504 is controlled by the electric push rod 503 for a second detection.

[0054] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0055] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A device for detecting vertical deformation during the closure of a long-span bridge cantilever, comprising a symmetrically arranged telescopic vertical frame structure (1) and a sliding rail structure (7), characterized in that, A retractable horizontal frame structure (2) is provided on one side of the bottom of the vertical frame structure (1). A structural reinforcement mechanism (3) is provided between the vertical frame structures (1). A hoisting mechanism (4) is provided at the top of the structural reinforcement mechanism (3). A rotatable detection mechanism (5) is provided at the bottom of the structural reinforcement mechanism (3). The slide rail structure (7) is installed on the bridge cantilever on both sides to be joined by expansion bolts. A moving mechanism (6) is provided at the end of the horizontal frame structure (2). The detection mechanism (5) slides on the slide rail structure (7) through the moving mechanism (6) to detect the vertical deformation of the bridge cantilever on both sides.

2. The vertical deformation detection device for cantilever closure of a long-span bridge according to claim 1, characterized in that, The vertical frame structure (1) includes a lower main column (101), and a lower sliding cavity (102) is provided inside the lower main column (101). A middle support column (103) is slidably inserted into the upper part of the lower main column (101) through the lower sliding cavity (102). A middle sliding cavity (104) is provided inside the middle support column (103). An upper column (105) is slidably connected to the upper part of the middle support column (103) through the middle sliding cavity (104).

3. The vertical deformation detection device for cantilever closure of a long-span bridge according to claim 2, characterized in that, The lower main column (101), the middle support column (103), and the upper column (105) are all provided with through-hole positioning holes (106) on their side walls. Positioning pins (107) are inserted into the positioning holes (106). The lower main column (101), the middle support column (103), and the upper column (105) are locked together by the positioning holes (106) and the positioning pins (107).

4. The vertical deformation detection device for cantilever closure of a long-span bridge according to claim 3, characterized in that, The crossbeam structure (2) includes a main crossbeam (201) welded and fixed to the side of the lower main column (101), and a middle crossbeam (202) is slidably connected to the end of the main crossbeam (201). An end crossbeam (203) is inserted into the end of the middle crossbeam (202), and a connecting column (204) is welded between the symmetrically arranged main crossbeam (201), middle crossbeam (202) and end crossbeam (203).

5. The vertical deformation detection device for cantilever closure of a long-span bridge according to claim 4, characterized in that, The main crossbar (201) is provided with a T-shaped groove (205), and the top of the T-shaped groove (205) is integrally formed with an upper locking tooth (206). The upper part of the middle crossbar (202) is integrally formed with a lower locking tooth (207). After the upper locking tooth (206) and the lower locking tooth (207) are engaged, the positions of the main crossbar (201) and the middle crossbar (202) are locked.

6. The vertical deformation detection device for cantilever closure of a long-span bridge according to claim 4, characterized in that, The lower main column (101) has longitudinal connecting ring 1 (108) and transverse connecting ring 1 (208) welded to both sides and the upper end of the main horizontal column (201), respectively. The middle support column (103) has longitudinal connecting ring 2 (109) and transverse connecting ring 2 (209) welded to both sides and the upper end of the middle horizontal column (202), respectively. The upper column (105) has longitudinal connecting ring 3 (110) and transverse connecting ring 3 (210) welded to both sides and the upper end of the end horizontal column (203), respectively. Steel wire ropes (211) are connected between longitudinal connecting ring 1 (108) and transverse connecting ring 1 (208), between longitudinal connecting ring 2 (109) and transverse connecting ring 2 (209), and between longitudinal connecting ring 3 (110) and transverse connecting ring 3 (210).

7. The vertical deformation detection device for cantilever closure of a long-span bridge according to claim 2, characterized in that, The structural reinforcement mechanism (3) includes multiple main steel frames (301) welded and fixed between the lower main columns (101). A connecting frame (302) is welded inside the main steel frame (301), and a V-shaped support frame (303) is welded between two adjacent main steel frames (301). The hoisting mechanism (4) includes a top plate (401) welded to the uppermost main steel frame (301), and two sets of symmetrically arranged hoisting rings (402) are welded on the top plate (401).

8. The vertical deformation detection device for cantilever closure of a long-span bridge according to claim 7, characterized in that, The detection mechanism (5) includes a base plate (501) welded to the lowest main steel frame (301), and a stepper motor (502) is bolted to the upper part of the base plate (501). An electric push rod (503) is fixedly installed on the output shaft of the stepper motor (502), and a laser emitter body (504) is fixedly installed at the end of the electric push rod (503).

9. The vertical deformation detection device for cantilever closure of a long-span bridge according to claim 4, characterized in that, The moving mechanism (6) includes a bearing (601) mounted on the side of the end column (203), and a roller (602) is mounted on the outer ring of the bearing (601).

10. The vertical deformation detection device for cantilever closure of a long-span bridge according to claim 9, characterized in that, The slide rail structure (7) includes a rail body (701), the upper end of the rail body (701) is provided with a guide groove (702), and the roller (602) is disposed in the guide groove (702). The lower sides of both ends of the rail body (701) are integrally formed with fixing plates (703), and fixing through holes (704) are provided on the fixing plates (703).

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