Bridge construction anti-falling device

Abstract

The application relates to a bridge construction anti-falling device which comprises a working platform, a first guardrail and a second guardrail, the first guardrail is arranged on the two sides of the working platform in the width direction, and the second guardrail is arranged on the two ends of the working platform in the length direction; the first guardrail comprises a fixed frame, an intermediate plate body, a first side plate body and a second side plate body, the first side plate body and the second side plate body slide in opposite directions to be opened, first guide rails are arranged on the two sides of the top surface of the working platform in the width direction, and the first guardrail slides along the first guide rails; the second guardrail comprises a first unit plate body and a second unit plate body, the first unit plate body and the second unit plate body slide to be opened, second guide rails are arranged on the two ends of the top surface of the working platform in the width direction, and the second guardrail slides along the second guide rails. The first guardrail and the second guardrail prevent the operators and tools from falling from four directions, the first guardrail and the second guardrail can be opened and shrunk, the first guardrail and the second guardrail are convenient to transport and carry after being shrunk, and the first guardrail and the second guardrail are flexible and convenient to use in cooperation with the first guide rails and the second guide rails.

Description

Technical Field

[0001] This application relates to the field of bridge construction, and in particular to a bridge construction anti-fall device. Background Technology

[0002] Bridge construction is the process of building a bridge, which requires the use of aerial work platforms.

[0003] Currently, the bridge construction anti-fall devices commonly found on the market are inconvenient to transport and handle due to the large size of the entire guardrail, and the disassembly and assembly operations are also inconvenient. Utility Model Content

[0004] To address the aforementioned problems, this application provides a bridge construction anti-fall device.

[0005] The bridge construction anti-fall device provided in this application includes a working platform, a first guardrail and a second guardrail. The first guardrail is installed on both sides of the working platform in the width direction, and the second guardrail is installed at both ends of the working platform in the length direction. The first guardrail includes a fixed frame, a middle plate, a first side plate, and a second side plate. The first side plate and the second side plate slide open in opposite directions. The top surface of the work platform is provided with first guide rails on both sides in the width direction. The first guardrail is inserted into the first guide rails and can slide along the first guide rails. The second guardrail includes a first unit plate and a second unit plate. The first unit plate and the second unit plate slide open. The two ends of the top surface of the work platform in the width direction are provided with second guide rails. The second guardrail is inserted into the second guide rails and can slide along the second guide rails.

[0006] Preferably, the intermediate plate is fixed in the middle of the thickness direction of the fixed frame, and a first side groove is provided on one side of the fixed frame in the width direction for the first side plate to slide out. One side of the first side plate slides out of the fixed frame from the first side groove, and the other side of the first side plate overlaps with the intermediate plate. A second side groove is provided on the other side of the fixed frame in the width direction for the second side plate to slide out. One side of the second side plate slides out of the fixed frame from the second side groove, and the other side of the second side plate overlaps with the intermediate plate. The first side groove and the second side groove are symmetrically arranged on both sides of the thickness direction of the middle plate. The first side plate is connected to a first positioning side on the side away from the fixed frame. When the first side plate is located inside the fixed frame, the first positioning side abuts against the side wall of the fixed frame in the width direction. The bottom surface of the first positioning side is flush with the top surface of the first guide rail. The second side plate is connected to a second positioning side on the side away from the fixed frame. When the second side plate is located inside the fixed frame, the second positioning side abuts against the side wall of the fixed frame in the width direction. The bottom surface of the second positioning side is flush with the top surface of the first guide rail.

[0007] Preferably, one side wall of the fixed frame in the width direction is provided with a first positioning plate that is connected and positioned to the first side plate that slides outside the fixed frame. The first positioning plate is provided with a first positioning hole. The first side plate that slides outside the fixed frame is provided with a first threaded hole that is aligned with the first positioning hole. A first positioning screw is provided in the first positioning hole. The first positioning screw passes through the first positioning hole and is threadedly connected to the first threaded hole. The other side wall of the fixed frame in the width direction is provided with a second positioning plate that is connected and positioned to the second side plate that slides outside the fixed frame. The second positioning plate is provided with a second positioning hole. The second side plate that slides outside the fixed frame is provided with a second threaded hole that is aligned with the second positioning hole. A second positioning screw is provided in the second positioning hole. The second positioning screw passes through the second positioning hole and is threadedly connected to the second threaded hole.

[0008] Preferably, the top surface of the first guide rail is provided with a slot for inserting a fixing frame, a first guide groove for sliding the first side plate, and a second guide groove for sliding the second side plate. The first guide groove and the second guide groove are both connected to the slot.

[0009] Preferably, the top surface of the first guide rail is provided with a first locking plate that is connected and positioned to the first side plate that slides outside the fixed frame. The first locking plate is provided with a first locking hole. The first side plate that slides outside the fixed frame is provided with a third threaded hole that is aligned with the first locking hole. A first locking screw is provided in the first locking hole. The first locking screw passes through the first locking hole and is threadedly connected to the third threaded hole. The top surface of the first guide rail is provided with a second locking plate that is connected and positioned to the second side plate that slides outside the fixed frame. The second locking plate is provided with a second locking hole. The second side plate that slides outside the fixed frame is provided with a fourth threaded hole that is aligned with the second locking hole. The second locking hole is provided with a second locking screw. The second locking screw passes through the second locking hole and is threadedly connected to the fourth threaded hole. The side of the first positioning side closest to the first locking plate is flush with the side of the first side plate closest to the first locking plate, and the side of the first positioning side furthest from the first locking plate protrudes from the side of the first side plate furthest from the first locking plate. The side of the second positioning side closest to the second locking plate is flush with the side of the second side plate closest to the second locking plate, and the side of the second positioning side furthest from the second locking plate protrudes from the side of the second side plate furthest from the second locking plate.

[0010] Preferably, a first fixing plate and a second fixing plate are provided on both sides of the bottom of the fixing frame, the first fixing plate is attached to the top surface of the first guide rail, and the second fixing plate is attached to the top surface of the second guide rail; The first fixing plate is provided with a first fixing hole, and the top surface of the first guide rail is provided with a fifth threaded hole aligned with the first fixing hole. A first fixing screw is provided in the first fixing hole, and the first fixing screw passes through the first fixing hole and is threadedly connected to the fifth threaded hole. The second fixing plate is provided with a second fixing hole, and the top surface of the first guide rail is provided with a sixth threaded hole aligned with the second fixing hole. A second fixing screw is provided in the second fixing hole, and the second fixing screw passes through the second fixing hole and is threadedly connected to the sixth threaded hole.

[0011] Preferably, a first dovetail rod is provided on the side of the first unit plate near the second unit plate, and multiple first dovetail rods are provided at equal intervals along the height direction of the first unit plate. A first dovetail groove is provided on the side of the second unit plate near the first unit plate for the first dovetail rod to slide, and the first dovetail groove corresponds one-to-one with the first dovetail rod. The second unit plate is provided with a second dovetail rod on the side of the second unit plate that is close to the first unit plate. Multiple second dovetail rods are provided at equal intervals along the height direction of the second unit plate. The second dovetail rods are staggered with the first dovetail rods. The first unit plate is provided with a second dovetail groove on the side of the first unit plate that is close to the second unit plate, which allows the second dovetail rods to slide. The second dovetail grooves correspond one-to-one with the second dovetail rods. The first unit plate has a first locking hole in the middle of its longitudinal direction, and the second unit plate has a second locking hole in the middle of its longitudinal direction. Multiple first locking holes and multiple second locking holes are provided at intervals. The spacing between the first locking holes and the spacing between the second locking holes are the same. A positioning pin is provided in the first locking hole, and the positioning pin passes through both the first locking hole and the second locking hole.

[0012] Preferably, the top surface of the second guide rail is provided with a guide groove for inserting the second guardrail; The top surface of the second guide rail is provided with a first connecting plate and a second connecting plate. The first connecting plate is attached to the side of the first unit plate, and the second connecting plate is attached to the side of the second unit plate. The first connecting plate is provided with a first connecting hole, and the side wall of the first unit plate is provided with a seventh threaded hole. The first connecting hole is provided with a first connecting screw, and the first connecting screw passes through the first connecting hole and is threadedly connected to the seventh threaded hole. The second connecting plate is provided with a second connecting hole, and the side wall of the second unit plate is provided with an eighth threaded hole. A second connecting screw is provided in the second connecting hole, and the second connecting screw passes through the second connecting hole and is threadedly connected to the eighth threaded hole.

[0013] Preferably, a lifting ring is provided on the top surface of the fixing frame.

[0014] Preferably, the work platform has mounting holes at both ends along its length, which can be connected to the platform of the elevator.

[0015] In summary, this application includes at least one of the following beneficial technical effects: 1. The first and second guardrails prevent operators and tools from falling from four directions, ensuring operator safety; 2. Both the first and second guardrails can be opened and retracted. When retracted, they are easy to transport and handle. With the help of the first and second guide rails, the opening process of the first and second guardrails is quick and flexible. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the anti-fall device for bridge construction, used in the embodiments of this application.

[0017] Figure 2 This is a structural schematic diagram used to illustrate the first fixing plate in an embodiment of this application.

[0018] Figure 3 This is a structural schematic diagram used to illustrate the second fixing plate in an embodiment of this application.

[0019] Figure 4 This is a structural schematic diagram used in the embodiments of this application to illustrate the first dovetail rod and the second dovetail groove.

[0020] Figure 5 This is a structural schematic diagram used in the embodiments of this application to illustrate the second dovetail rod and the first dovetail groove.

[0021] Explanation of reference numerals in the attached drawings: 1. Working platform; 11. Assembly hole; 2. First guardrail; 21. Fixing frame; 211. First side slide groove; 212. Second side slide groove; 213. First positioning plate; 2131. First positioning hole; 214. Second positioning plate; 2141. Second positioning hole; 215. First fixing plate; 2151. First fixing hole; 216. Second fixing plate; 2161. Second fixing hole; 217. Lifting ring; 22. Intermediate plate; 23. First side plate; 231. First positioning side; 232. First threaded hole; 233. Third threaded hole; 24. Second side plate; 241. Second positioning side; 242. Second threaded hole; 243. Fourth threaded hole; 3. 2. Guardrail; 31. First unit plate; 311. First dovetail rod; 312. Second dovetail groove; 313. First locking hole; 314. Seventh threaded hole; 32. Second unit plate; 321. Second dovetail rod; 322. First dovetail groove; 323. Second locking hole; 324. Eighth threaded hole; 4. First guide rail; 41. Slot; 42. First guide groove; 43. Second guide groove; 44. First locking plate; 441. First locking hole; 45. Second locking plate; 451. Second locking hole; 46. Fifth threaded hole; 47. Sixth threaded hole; 5. Second guide rail; 51. Guide groove; 52. First connecting plate; 521. First connecting hole; 53. Second connecting plate; 531. Second connecting hole. Detailed Implementation

[0022] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0023] This application discloses a bridge construction anti-fall device.

[0024] Reference Figure 1-5 The bridge construction anti-fall device includes a working platform 1, a first guardrail 2, and a second guardrail 3. The first guardrail 2 is installed on both sides of the working platform 1 in the width direction, and the second guardrail 3 is installed at both ends of the working platform 1 in the length direction. The first guardrail 2 and the second guardrail 3 prevent operators and tools from falling from four directions, ensuring the safety of operators.

[0025] The first guardrail 2 includes a fixed frame 21, a middle plate 22, a first side plate 23, and a second side plate 24. The first side plate 23 and the second side plate 24 slide open in opposite directions. First guide rails 4 are provided on both sides of the top surface of the work platform 1 in the width direction. The first guardrail 2 is inserted into the first guide rails 4 and can slide along the first guide rails 4. Both the first guardrail 2 and the second guardrail 3 can be opened and retracted, and the retracted version is convenient for transportation and handling.

[0026] The middle plate 22 is fixed to the middle part of the thickness direction of the fixed frame 21. A first side slide groove 211 is provided on one side of the fixed frame 21 in the width direction for the first side plate 23 to slide out. One side of the first side plate 23 slides out of the first side slide groove 211 and the other side of the first side plate 23 overlaps with the middle plate 22. A second side slide groove 212 is provided on the other side of the fixed frame 21 in the width direction for the second side plate 24 to slide out. One side of the second side plate 24 slides out of the fixed frame 21 from the second side slide groove 212 and the other side of the second side plate 24 overlaps with the middle plate 22.

[0027] The first side groove 211 and the second side groove 212 are symmetrically arranged on both sides of the thickness direction of the middle plate 22.

[0028] The first side plate 23 is connected to the first positioning side 231 on the side away from the fixed frame 21. When the first side plate 23 is located inside the fixed frame 21, the first positioning side 231 abuts against the side wall of the fixed frame 21 in the width direction. The bottom surface of the first positioning side 231 is flush with the top surface of the first guide rail 4.

[0029] The second side plate 24 is connected to the second positioning side 241 on the side away from the fixed frame 21. When the second side plate 24 is located inside the fixed frame 21, the second positioning side 241 abuts against the side wall of the fixed frame 21 in the width direction. The bottom surface of the second positioning side 241 is flush with the top surface of the first guide rail 4.

[0030] A first positioning plate 213 is provided on one side wall of the fixed frame 21 in the width direction, which is connected and positioned to the first side plate 23 that slides outside the fixed frame 21. The first positioning plate 213 is provided with a first positioning hole 2131. The first side plate 23 that slides outside the fixed frame 21 is provided with a first threaded hole 232 that aligns with the first positioning hole 2131. A first positioning screw is provided in the first positioning hole 2131. After the first positioning screw passes through the first positioning hole 2131, it is threadedly connected to the first threaded hole 232, thereby fixing the first side plate 23 to the fixed frame 21.

[0031] The other side wall of the fixed frame 21 in the width direction is provided with a second positioning plate 214 that is connected and positioned to the second side plate 24 that slides outside the fixed frame 21. The second positioning plate 214 is provided with a second positioning hole 2141. The second side plate 24 that slides outside the fixed frame 21 is provided with a second threaded hole 242 that is aligned with the second positioning hole 2141. A second positioning screw is provided in the second positioning hole 2141. After the second positioning screw passes through the second positioning hole 2141, it is threadedly connected to the second threaded hole 242, so that the second side plate 24 is fixed to the fixed frame 21.

[0032] The top surface of the first guide rail 4 is provided with a slot 41 for inserting the fixed frame 21, a first guide groove 42 for sliding the first side plate 23, and a second guide groove 43 for sliding the second side plate 24. The first guide groove 42 and the second guide groove 43 are both connected to the slot 41. The first guide rail 4 guides and limits the sliding of the first side plate 23 and the second side plate 24, making the opening process of the first guardrail 2 quick and flexible.

[0033] A first locking plate 44 is provided on the top surface of the first guide rail 4 and is connected and positioned to the first side plate 23 that slides outside the fixed frame 21. The first locking plate 44 is provided with a first locking hole 441. The first side plate 23 that slides outside the fixed frame 21 is provided with a third threaded hole 233 that is aligned with the first locking hole 441. A first locking screw is provided in the first locking hole 441. After the first locking screw passes through the first locking hole 441, it is threadedly connected to the third threaded hole 233, so that the first side plate 23 is fixed to the first guide rail 4.

[0034] A second locking plate 45 is provided on the top surface of the first guide rail 4, which is connected and positioned to the second side plate 24 that slides outside the fixed frame 21. The second locking plate 45 is provided with a second locking hole 451. The second side plate 24 that slides outside the fixed frame 21 is provided with a fourth threaded hole 243 that aligns with the second locking hole 451. A second locking screw is provided in the second locking hole 451. After the second locking screw passes through the second locking hole 451, it is threadedly connected to the fourth threaded hole 243, thereby fixing the second side plate 24 to the first guide rail 4.

[0035] The side of the first positioning side 231 closest to the first locking plate 44 is flush with the side of the first side plate 23 closest to the first locking plate 44, so as to prevent the first locking plate 44 from obstructing the sliding of the first side plate 23. The side of the first positioning side 231 furthest from the first locking plate 44 protrudes from the side of the first side plate 23 furthest from the first locking plate 44.

[0036] The side of the second positioning side 241 closest to the second locking plate 45 is flush with the side of the second side plate 24 closest to the second locking plate 45, so as to prevent the second locking plate 45 from obstructing the sliding of the second side plate 24. The side of the second positioning side 241 furthest from the second locking plate 45 protrudes from the side of the second side plate 24 furthest from the second locking plate 45.

[0037] The bottom sides of the fixed frame 21 are provided with a first fixed plate 215 and a second fixed plate 216. The first fixed plate 215 is attached to the top surface of the first guide rail 4, and the second fixed plate 216 is attached to the top surface of the second guide rail 5.

[0038] The first fixing plate 215 is provided with a first fixing hole 2151, and the top surface of the first guide rail 4 is provided with a fifth threaded hole 46 aligned with the first fixing hole 2151. A first fixing screw is provided in the first fixing hole 2151 and is threadedly connected to the fifth threaded hole 46 after passing through the first fixing hole 2151. The second fixing plate 216 is provided with a second fixing hole 2161, and the top surface of the first guide rail 4 is provided with a sixth threaded hole 47 aligned with the second fixing hole 2161. A second fixing screw is provided in the second fixing hole 2161 and is threadedly connected to the sixth threaded hole 47 after passing through the second fixing hole 2161, thereby fixing the fixing frame 21 to the first guide rail 4.

[0039] The second guardrail 3 includes a first unit plate 31 and a second unit plate 32. The first unit plate 31 and the second unit plate 32 slide open. The two ends of the top surface of the work platform 1 in the width direction are provided with second guide rails 5. The second guardrail 3 is inserted into the second guide rails 5 and can slide along the second guide rails 5.

[0040] A first dovetail rod 311 is provided on the side of the first unit plate 31 near the second unit plate 32. Multiple first dovetail rods 311 are equidistantly arranged along the height direction of the first unit plate 31. A first dovetail groove 322 is provided on the side of the second unit plate 32 near the first unit plate 31 for sliding of the first dovetail rods 311. The first dovetail groove 322 corresponds one-to-one with the first dovetail rods 311, thereby improving the sliding stability of the first unit plate 31 and the second unit plate 32.

[0041] A second dovetail rod 321 is provided on the side of the second unit plate 32 that is close to the first unit plate 31. Multiple second dovetail rods 321 are equidistantly arranged along the height direction of the second unit plate 32. The second dovetail rods 321 and the first dovetail rods 311 are staggered. A second dovetail groove 312 is provided on the side of the first unit plate 31 that is close to the second unit plate 32, which allows the second dovetail rods 321 to slide. The second dovetail groove 312 corresponds one-to-one with the second dovetail rods 321, thereby improving the sliding stability of the first unit plate 31 and the second unit plate 32.

[0042] The first unit plate 31 has a first locking hole 313 in the middle of its longitudinal direction, and the second unit plate 32 has a second locking hole 323 in the middle of its longitudinal direction. Multiple first locking holes 313 and multiple second locking holes 323 are spaced apart. The spacing between the first locking holes 313 and the spacing between the second locking holes 323 are the same. A positioning pin is provided in the first locking hole 313. The positioning pin passes through both the first locking hole 313 and the second locking hole 323 to position the second unit plate 32 with the first unit plate 31. The second unit plate 32 can be slid by pulling out the positioning pin, allowing the operator to enter and exit. The operator can enter and exit from both second guardrails 3.

[0043] The top surface of the second guide rail 5 is provided with a guide groove 51 for the insertion of the second guardrail 3. The second guide rail 5 guides and limits the sliding of the second unit plate 32, so that the opening process of the second guardrail 3 is fast and flexible and convenient to use.

[0044] The top surface of the second guide rail 5 is provided with a first connecting plate 52 and a second connecting plate 53. The first connecting plate 52 is attached to the side of the first unit plate 31, and the second connecting plate 53 is attached to the side of the second unit plate 32.

[0045] The first connecting plate 52 is provided with a first connecting hole 521, and the side wall of the first unit plate 31 is provided with a seventh threaded hole 314. The first connecting screw is provided in the first connecting hole 521. After the first connecting screw passes through the first connecting hole 521, it is threadedly connected to the seventh threaded hole 314, so that the first unit plate 31 is fixed to the second guide rail 5.

[0046] The second connecting plate 53 is provided with a second connecting hole 531, and the side wall of the second unit plate 32 is provided with an eighth threaded hole 324. A second connecting screw is provided in the second connecting hole 531. After the second connecting screw passes through the second connecting hole 531, it is threadedly connected to the eighth threaded hole 324, so that the second unit plate 32 is fixed to the second guide rail 5.

[0047] A lifting ring 217 is provided on the top surface of the fixed frame 21, which can be used with the crane.

[0048] The work platform 1 has assembly holes 11 at both ends along its length. The assembly holes 11 can be connected to the platform of the elevator to raise the work platform 1 to a higher position.

[0049] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A bridge construction anti-fall device, characterized in that: It includes a work platform, a first guardrail and a second guardrail. The first guardrail is installed on both sides of the work platform in the width direction, and the second guardrail is installed at both ends of the work platform in the length direction. The first guardrail includes a fixed frame, a middle plate, a first side plate, and a second side plate. The first side plate and the second side plate slide open in opposite directions. The top surface of the work platform is provided with first guide rails on both sides in the width direction. The first guardrail is inserted into the first guide rails and can slide along the first guide rails. The second guardrail includes a first unit plate and a second unit plate. The first unit plate and the second unit plate slide open. The two ends of the top surface of the work platform in the width direction are provided with second guide rails. The second guardrail is inserted into the second guide rails and can slide along the second guide rails.

2. The bridge construction anti-fall device according to claim 1, characterized in that: The intermediate plate is fixed in the middle of the thickness direction of the fixed frame. A first side slide groove is provided on one side of the fixed frame in the width direction for the first side plate to slide out. One side of the first side plate slides out of the fixed frame from the first side slide groove, and the other side of the first side plate overlaps with the intermediate plate. A second side slide groove is provided on the other side of the fixed frame in the width direction for the second side plate to slide out. One side of the second side plate slides out of the fixed frame from the second side slide groove, and the other side of the second side plate overlaps with the intermediate plate. The first side groove and the second side groove are symmetrically arranged on both sides of the thickness direction of the middle plate. The first side plate is connected to a first positioning side on the side away from the fixed frame. When the first side plate is located inside the fixed frame, the first positioning side abuts against the side wall of the fixed frame in the width direction. The bottom surface of the first positioning side is flush with the top surface of the first guide rail. The second side plate is connected to a second positioning side on the side away from the fixed frame. When the second side plate is located inside the fixed frame, the second positioning side abuts against the side wall of the fixed frame in the width direction. The bottom surface of the second positioning side is flush with the top surface of the first guide rail.

3. The bridge construction anti-fall device according to claim 2, characterized in that: A first positioning plate is provided on one side wall in the width direction of the fixed frame, which is connected and positioned to the first side plate that slides outside the fixed frame. The first positioning plate is provided with a first positioning hole. The first side plate that slides outside the fixed frame is provided with a first threaded hole that is aligned with the first positioning hole. A first positioning screw is provided in the first positioning hole. The first positioning screw passes through the first positioning hole and is threadedly connected to the first threaded hole. The other side wall of the fixed frame in the width direction is provided with a second positioning plate that is connected and positioned to the second side plate that slides outside the fixed frame. The second positioning plate is provided with a second positioning hole. The second side plate that slides outside the fixed frame is provided with a second threaded hole that is aligned with the second positioning hole. A second positioning screw is provided in the second positioning hole. The second positioning screw passes through the second positioning hole and is threadedly connected to the second threaded hole.

4. The bridge construction anti-fall device according to claim 2, characterized in that: The top surface of the first guide rail is provided with a slot for inserting a fixed frame, a first guide groove for sliding the first side plate, and a second guide groove for sliding the second side plate. The first guide groove and the second guide groove are both connected to the slot.

5. The bridge construction anti-fall device according to claim 4, characterized in that: The top surface of the first guide rail is provided with a first locking plate that is connected and positioned to the first side plate that slides outside the fixed frame. The first locking plate is provided with a first locking hole. The first side plate that slides outside the fixed frame is provided with a third threaded hole that is aligned with the first locking hole. A first locking screw is provided in the first locking hole. The first locking screw passes through the first locking hole and is threadedly connected to the third threaded hole. The top surface of the first guide rail is provided with a second locking plate that is connected and positioned to the second side plate that slides outside the fixed frame. The second locking plate is provided with a second locking hole. The second side plate that slides outside the fixed frame is provided with a fourth threaded hole that is aligned with the second locking hole. The second locking hole is provided with a second locking screw. The second locking screw passes through the second locking hole and is threadedly connected to the fourth threaded hole. The side of the first positioning side closest to the first locking plate is flush with the side of the first side plate closest to the first locking plate, and the side of the first positioning side furthest from the first locking plate protrudes from the side of the first side plate furthest from the first locking plate. The side of the second positioning side closest to the second locking plate is flush with the side of the second side plate closest to the second locking plate, and the side of the second positioning side furthest from the second locking plate protrudes from the side of the second side plate furthest from the second locking plate.

6. The bridge construction anti-fall device according to claim 2, characterized in that: The bottom two sides of the fixed frame are provided with a first fixed plate and a second fixed plate. The first fixed plate is attached to the top surface of the first guide rail, and the second fixed plate is attached to the top surface of the second guide rail. The first fixing plate is provided with a first fixing hole, and the top surface of the first guide rail is provided with a fifth threaded hole aligned with the first fixing hole. A first fixing screw is provided in the first fixing hole, and the first fixing screw passes through the first fixing hole and is threadedly connected to the fifth threaded hole. The second fixing plate is provided with a second fixing hole, and the top surface of the first guide rail is provided with a sixth threaded hole aligned with the second fixing hole. A second fixing screw is provided in the second fixing hole, and the second fixing screw passes through the second fixing hole and is threadedly connected to the sixth threaded hole.

7. The bridge construction anti-fall device according to claim 1, characterized in that: The first unit plate is provided with a first dovetail rod on the side close to the second unit plate. Multiple first dovetail rods are provided at equal intervals along the height direction of the first unit plate. The second unit plate is provided with a first dovetail groove on the side close to the first unit plate for sliding the first dovetail rod. The first dovetail groove corresponds to the first dovetail rod one by one. The second unit plate is provided with a second dovetail rod on the side of the second unit plate that is close to the first unit plate. Multiple second dovetail rods are provided at equal intervals along the height direction of the second unit plate. The second dovetail rods are staggered with the first dovetail rods. The first unit plate is provided with a second dovetail groove on the side of the first unit plate that is close to the second unit plate, which allows the second dovetail rods to slide. The second dovetail grooves correspond one-to-one with the second dovetail rods. The first unit plate has a first locking hole in the middle of its longitudinal direction, and the second unit plate has a second locking hole in the middle of its longitudinal direction. Multiple first locking holes and multiple second locking holes are provided at intervals. The spacing between the first locking holes and the spacing between the second locking holes are the same. A positioning pin is provided in the first locking hole, and the positioning pin passes through both the first locking hole and the second locking hole.

8. The bridge construction anti-fall device according to claim 7, characterized in that: The top surface of the second guide rail is provided with a guide groove for inserting the second guardrail; The top surface of the second guide rail is provided with a first connecting plate and a second connecting plate. The first connecting plate is attached to the side of the first unit plate, and the second connecting plate is attached to the side of the second unit plate. The first connecting plate is provided with a first connecting hole, and the side wall of the first unit plate is provided with a seventh threaded hole. The first connecting hole is provided with a first connecting screw, and the first connecting screw passes through the first connecting hole and is threadedly connected to the seventh threaded hole. The second connecting plate is provided with a second connecting hole, and the side wall of the second unit plate is provided with an eighth threaded hole. A second connecting screw is provided in the second connecting hole, and the second connecting screw passes through the second connecting hole and is threadedly connected to the eighth threaded hole.

9. The bridge construction anti-fall device according to claim 1, characterized in that: A lifting ring is provided on the top surface of the fixed frame.

10. The bridge construction anti-fall device according to claim 1, characterized in that: The work platform has assembly holes at both ends along its length, which can be connected to the platform of the elevator.

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