A safety protection device for road and bridge construction

Abstract

The present invention provides a safety protection device for road and bridge construction, which relates to the technical field of construction protection. It includes a main column. The two sides of the bottom of the main column are fixed with bottom plates, and the bottom plates are slidably inserted with first plug columns. Receiving grooves are formed on both sides of the main column, and a winding shaft is rotatably installed inside the receiving grooves. A protective net is wound on the winding shaft. A plurality of auxiliary columns are arranged on the outer side of the protective net. The auxiliary column includes a vertical frame. A through groove is formed in the middle position of the vertical frame, and the protective net slides through the through groove. Four pulleys are installed at the bottom of the vertical frame, and contact pads are arranged on both sides of the bottom of the vertical frame. A connecting ring is fixed at the top of the vertical frame. Compared with the prior art, through the expansion of a plurality of auxiliary columns and the protective net, it can be applied to construction sites with different shapes and sizes, enclose the construction area, prevent flying sand and stones from flowing into the outside, prevent pedestrians and vehicles from entering, and facilitate installation and later gathering and storage.

Description

Technical Field

[0001] The present invention relates to the technical field of construction protection, and specifically relates to a safety protection device for road and bridge construction. Background Art

[0002] The content of roadbed construction generally includes: the main project of the roadbed, borrow pits and spoil banks, berms and benched slopes, comprehensive roadbed drainage, roadbed protection and reinforcement, filled and cut roadbeds, roadbeds in special engineering geological areas, construction in winter and rainy seasons, and river or ditch diversion projects caused by roadbed construction, construction organization of earthwork projects, roadbed renovation, quality inspection, project acceptance and other engineering projects. During the road and bridge construction process, it is necessary to warn road pedestrians, and at the same time, it is necessary to enclose the construction site to prevent pedestrians from straying in and prevent accidents.

[0003] Existing protection measures mainly block and remind pedestrians and vehicles through warning signs and roadblocks. The protection range of this method is small. There are also some that use assembled protection fences for protection, which can provide a larger range of protection, but installation and disassembly take a lot of time, and it is inconvenient to enclose all areas when dealing with some irregular construction areas. Summary of the Invention

[0004] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a safety protection device for road and bridge construction to solve the problems raised in the above background art. The structure of the present invention is novel. Through the expansion of multiple groups of secondary columns and protection nets, it can be applied to construction sites of different shapes and sizes, enclose the construction area, prevent flying sand and stones from flowing into the outside, prevent pedestrians and vehicles from entering, and facilitate installation and subsequent gathering and storage.

[0005] To achieve the above purpose, the present invention is realized through the following technical solutions: A safety protection device for road and bridge construction includes a main column. The bottom sides of the main column are fixed with bottom plates, and the bottom plates are slidably inserted with first insertion columns. Receiving grooves are opened on both sides of the main column, and a winding shaft is rotatably installed inside the receiving grooves. A protection net is wound on the winding shaft. Multiple groups of secondary columns are arranged outside the protection net. The secondary column includes a vertical frame. A through groove is opened in the middle position of the vertical frame, and the protection net slides through the through groove. Four pulleys are installed at the bottom of the vertical frame, and contact pads are arranged on both sides of the bottom of the vertical frame. A connecting ring is fixed at the top of the vertical frame, and a pull rope passes through the inside of the connecting ring. A fixed column is fixed at the top of one side of the main column, and a warning light is installed on the top of the fixed column. A winding seat is rotatably installed at the top of the other side of the main column. One end of the pull rope is fixedly connected to the fixed column, and the other end of the pull rope is wound inside the winding seat. Clamping plates are arranged on both sides of the through groove, and the protection net is clamped between the two clamping plates.

[0006] Furthermore, spring telescopic plates are fixed on the outer surfaces of both sides of the main column, and elastic buckles are fixed at the extended ends of the spring telescopic plates. The elastic buckles are clamped to the sides of the auxiliary columns on both sides of the main column.

[0007] Furthermore, the auxiliary column further includes an insertion frame. The insertion frame is slidably inserted on the surface of the vertical frame corresponding to the outside of the clamping plate, and the insertion frame is fixedly connected to the clamping plate. A second connecting rod is rotatably installed at the bottom of the insertion frame through a rotating shaft. The bottom of the second connecting rod is rotatably connected to a connecting plate through a rotating shaft, and the bottom of the connecting plate is fixedly connected to the contact pad.

[0008] Furthermore, a guiding frame is fixed on the outer side of the vertical frame corresponding to the moving path of the connecting plate, and the connecting plate slides along the inside of the guiding frame. A braking block is fixed at the top of the contact pad and located inside the pulley.

[0009] Furthermore, an opening is provided at the top of the vertical frame, and an inclined plate is fixed to the top of the clamping plate. The bottom of the connecting ring is fixed with inclined blocks corresponding to the positions of the two inclined plates, and the inclined blocks slide along the inclined surfaces of the inclined plates. A return spring is fixed to the top of the vertical frame, and the other end of the return spring is fixedly connected to the connecting ring.

[0010] Furthermore, two clamping frames are symmetrically arranged inside the connecting ring, and insertion rods are fixed to the outer sides of the clamping frames. The insertion rods slide out of the connecting ring. Slide frames are provided on both sides of the top of the vertical frame, and sliders are slidably connected inside the slide frames. The sliders are fixedly connected to the insertion rods.

[0011] Furthermore, a bidirectional screw rod is rotatably installed at the top of the vertical frame through a bearing seat, and the top of the slide frame is threadedly sleeved on the surface of the bidirectional screw rod.

[0012] Furthermore, two first connecting rods are symmetrically rotatably connected to the bottom of the slide frame through rotating shafts, and the other ends of the first connecting rods are rotatably connected to a vertical plate through rotating shafts.

[0013] Furthermore, a second insertion post is fixed to the bottom of the vertical plate. A jack is provided at the position corresponding to the second insertion post on the surface of the contact pad, and the second insertion post slides out of the jack of the contact pad.

[0014] Furthermore, connecting ropes are fixed to the side walls of adjacent vertical frames.

[0015] Advantages of the present invention:

[0016] 1. The unused auxiliary columns on both sides of the main column of the present invention are limited by spring telescopic plates and elastic buckles. Under the pulling of an external force, the elastic buckles can be squeezed and deformed to allow the auxiliary columns to be removed. The elasticity of the spring telescopic plates automatically adjusts the length to limit the remaining auxiliary columns.

[0017] 2. During the process of the pull rope driving the connecting ring to move, the two inclined blocks at the bottom of the connecting ring slide along the inclined surfaces of the inclined plates of the clamping plates. Through the cooperation of their inclined surfaces, the inclined plates drive the clamping plates to move closer to the protective net, clamp and fix both sides of the protective net, maintain the tightness of the protective net between the two groups of auxiliary columns. The insertion frame moves together with the clamping plate. The second connecting rod at the bottom of the insertion frame drives the connecting plate to slide downward along the guiding frame. The contact pad contacts the ground. At the same time, the braking block frictionally contacts the top of the pulley to brake the pulley. The friction lines are arranged on the surface of the contact pad to increase the frictional force in contact with the ground, and further cooperate with the second insertion post to enhance the stability of the auxiliary column.

[0018] 3. During the process of the sliding frame moving horizontally, the first connecting rod drives the vertical plate at the bottom to descend, and the second insertion post is pre-passed through the insertion hole of the contact pad and inserted into the ground to simply and initially fix the auxiliary column. When the pull rope is pulled by the winding seat to move later, because the connecting ring is already clamped and fixed to the pull rope at this time, the connecting ring will move synchronously. The slider on the outer side of the insertion rod slides along the sliding frame to avoid movement interference.

[0019] 4. As the protective net and the pull rope are unfolded, the number of required auxiliary columns gradually increases. The pull rope is used to drive the subsequent auxiliary columns to move onto the unfolded protective net surface, and they are equidistantly arranged according to the complete unfolding of the connecting rope to maintain the stability after the protective net is unfolded.

[0020] 5. Compared with the prior art, through the unfolding of multiple groups of auxiliary columns and the protective net, the present invention can be applied to construction sites of different shapes and sizes, enclose the construction area, prevent flying sand and stones from flowing into the outside, prevent pedestrians and vehicles from entering, and facilitate installation and subsequent gathering and storage. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is the overall structural schematic diagram of a safety protection device for road and bridge construction according to the present invention;

[0022] Figure 2 is the front structural schematic diagram of the main column of a safety protection device for road and bridge construction according to the present invention;

[0023] Figure 3 is the connection schematic diagram of the protective net and the auxiliary column of a safety protection device for road and bridge construction according to the present invention;

[0024] Figure 4 is the side structural schematic diagram of the main column of a safety protection device for road and bridge construction according to the present invention;

[0025] Figure 5 is the connection schematic diagram of two groups of auxiliary columns of a safety protection device for road and bridge construction according to the present invention;

[0026] Figure 6Schematic diagram of the internal structure of the vertical frame of a safety protection device for road and bridge construction according to the present invention;

[0027] Figure 7 Schematic diagram of the top structure of the vertical frame of a safety protection device for road and bridge construction according to the present invention;

[0028] Figure 8 Schematic diagram of the connection between the connecting ring and the clamping plate of a safety protection device for road and bridge construction according to the present invention;

[0029] Figure 9 Schematic diagram of the bottom structure of the vertical frame of a safety protection device for road and bridge construction according to the present invention.

[0030] In the figure: 1, main column; 11, bottom plate; 12, first insertion column; 13, fixed column; 14, warning light; 15, winding seat; 16, pulling rope; 17, storage groove; 18, winding shaft; 19, spring telescopic plate; 110, elastic buckle block; 2, protection net; 3, auxiliary column; 31, connecting rope; 32, vertical frame; 33, through groove; 34, pulley; 35, contact pad; 36, second insertion column; 37, clamping plate; 38, insertion frame; 39, connecting ring; 310, clamping frame; 311, insertion rod; 312, sliding frame; 313, bidirectional screw; 314, slider; 315, first connecting rod; 316, vertical plate; 317, inclined plate; 318, inclined block; 319, return spring; 320, brake block; 321, second connecting rod; 322, guiding frame; 323, connecting plate. Detailed implementation manners

[0031] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation manners.

[0032] Please refer to Figures 1 to 9, the present invention provides a technical solution: a safety protection device for road and bridge construction, including a main column 1. On both sides of the bottom of the main column 1, there are fixed bottom plates 11, and a first plug post 12 is slidably inserted on the bottom plates 11. On both sides of the main column 1, there are provided storage grooves 17, and a winding shaft 18 is rotatably installed inside the storage grooves 17. A protective net 2 is wound on the winding shaft 18. On the outer side of the protective net 2, there are multiple sets of auxiliary columns 3. The auxiliary column 3 includes a vertical frame 32. In the middle position of the vertical frame 32, there is provided a through slot 33, and the protective net 2 slides through the through slot 33. At the bottom of the vertical frame 32, there are installed four pulleys 34, and on both sides of the bottom of the vertical frame 32, there are provided contact pads 35. At the top of the vertical frame 32, there is fixed a connecting ring 39. A pulling rope 16 passes through the inside of the connecting ring 39. On one side of the top of the main column 1, there is fixed a fixing column 13. On the top of the fixing column 13, there is installed a warning light 14, and on the other side of the top of the main column 1, there is rotatably installed a winding seat 15. One end of the pulling rope 16 is fixedly connected to the fixing column 13, and the other end of the pulling rope 16 is wound inside the winding seat 15. On both sides of the through slot 33, there are provided clamping plates 37, and the protective net 2 is clamped between the two clamping plates 37. When using the device, the main column 1 is arranged in the front of the construction area, and the main column 1 is fixed through the first plug post 12. The auxiliary column 3 is pulled to move, and the pulling rope 16 and the protective net 2 are unreeled by an appropriate length, so as to wrap the whole construction area. The wrapping range and shape of the protective net 2 are adjusted through multiple auxiliary columns 3 to meet the protection requirements of construction sites with different shapes and areas. The auxiliary column 3 is fixed at the corresponding position to keep the protective net 2 taut, so as to protect the construction area. In this solution, the connection between the auxiliary column 3 farthest from the main column 1 and the protective net 2 can be a detachable connection, such as the bonding of a sticker or the fixation of a bolt, and it can be opened before the layout or when the construction personnel pass by. Both the winding shaft 18 and the winding seat 15 are wound and unreeled through a motor or manually by a person.

[0033] In this embodiment, on the outer surfaces of both sides of the main column 1, there are fixed spring telescopic plates 19, and at the extended ends of the spring telescopic plates 19, there are fixed elastic buckle blocks 110. The elastic buckle blocks 110 are clamped with the side edges of the auxiliary columns 3 on both sides of the main column 1. The unused auxiliary columns 3 on both sides of the main column 1 are limited by the spring telescopic plates 19 and the elastic buckle blocks 110. Under the pulling force of an external force, the elastic buckle blocks 110 can be extruded and deformed to allow the auxiliary columns 3 to be removed. The elasticity of the spring telescopic plates 19 automatically adjusts the length to limit the remaining auxiliary columns 3.

[0034] In this embodiment, the auxiliary column 3 further includes an insertion frame 38. The insertion frame 38 is slidably inserted on the surface of the vertical frame 32 corresponding to the outside of the clamping plate 37, and the insertion frame 38 is fixedly connected to the clamping plate 37. The bottom of the insertion frame 38 is rotatably installed with a second connecting rod 321 through a rotating shaft. The bottom of the second connecting rod 321 is rotatably connected to a connecting plate 323 through a rotating shaft, and the bottom of the connecting plate 323 is fixedly connected to the contact pad 35. A guiding frame 322 is fixed on the outside of the vertical frame 32 corresponding to the moving path of the connecting plate 323, and the connecting plate 323 slides along the inside of the guiding frame 322. A braking block 320 is fixed on the inner side of the contact pad 35 at the top of the pulley 34. An opening is provided at the top of the vertical frame 32, and an inclined plate 317 is fixed to the top of the clamping plate 37. The bottom of the connecting ring 39 is fixed with inclined blocks 318 corresponding to the positions of the two inclined plates 317, and the inclined blocks 318 slide along the inclined surfaces of the inclined plates 317. A return spring 319 is fixed to the top of the vertical frame 32, and the other end of the return spring 319 is fixedly connected to the connecting ring 39. During the process of the pull rope 16 driving the connecting ring 39 to move, the two inclined blocks 318 at the bottom of the connecting ring 39 slide along the inclined surfaces of the inclined plates 317 of the clamping plate 37. Through the cooperation of the inclined surfaces of the two, the inclined plate 317 drives the clamping plate 37 to move closer to the protective net 2, clamping and fixing the two sides of the protective net 2, and maintaining the tightness of the protective net 2 between the two groups of auxiliary columns 3. The insertion frame 38 moves together with the clamping plate 37, drives the connecting plate 323 to slide downward along the guiding frame 322 through the second connecting rod 321 at the bottom of the insertion frame 38. The contact pad 35 contacts the ground, and at the same time, the braking block 320 frictionally contacts the top of the pulley 34 to brake the pulley 34. The friction lines are provided on the surface of the contact pad 35 to increase the friction force in contact with the ground, thereby further enhancing the stability of the auxiliary column 3 in cooperation with the second insertion post 36.

[0035] In this embodiment, two clamping frames 310 are symmetrically arranged inside the connecting ring 39, and inserting rods 311 are fixed on the outer sides of the clamping frames 310. The inserting rods 311 slide out of the connecting ring 39. On both sides of the top of the vertical frame 32, sliding frames 312 are arranged, and sliders 314 are slidably connected inside the sliding frames 312. The sliders 314 are fixedly connected to the inserting rods 311. A bidirectional screw rod 313 is rotatably installed at the top of the vertical frame 32 through a bearing seat, and the tops of the sliding frames 312 are threadedly sleeved on the surface of the bidirectional screw rod 313. At the bottom of the sliding frames 312, two first connecting rods 315 are symmetrically and rotatably connected through rotating shafts, and the other ends of the first connecting rods 315 are rotatably connected to a vertical plate 316 through rotating shafts. A second inserting post 36 is fixed at the bottom of the vertical plate 316. At a position corresponding to the second inserting post 36 on the surface of the contact pad 35, a jack is opened, and the second inserting post 36 slides out of the jack of the contact pad 35. When the auxiliary upright post 3 moves to a proper position and the connecting rope 31 is tightened, the bidirectional screw rod 313 is rotated. The tops of the two sliding frames 312 cooperate with the bidirectional screw rod 313 to drive the inserting rods 311 and the clamping frames 310 to clamp and fix the pulling rope 16 inside the connecting ring 39. During the horizontal movement of the sliding frames 312, the first connecting rods 315 drive the vertical plate 316 at the bottom to descend, and the second inserting post 36 is pre-inserted into the ground through the jack of the contact pad 35 to perform a simple initial fixation on the auxiliary upright post 3. When the pulling rope 16 is subsequently pulled by the winding seat 15 to move, since the connecting ring 39 is already clamped and fixed to the pulling rope 16 at this time, the connecting ring 39 will move synchronously, and the sliders 314 on the outer sides of the inserting rods 311 slide along the sliding frames 312 to avoid movement interference.

[0036] In this embodiment, a connecting rope 31 is fixed on the side wall of an adjacent vertical frame 32. Two vertical frames 32 are connected by a connecting rope 31. When initially stored near the main upright post 1, the connecting rope 31 is in a relaxed state. When pulled from the outermost auxiliary upright post 3, as the protective net 2 and the pulling rope 16 are unfolded, the number of required auxiliary upright posts 3 gradually increases. The pulling rope 16 is used to pull the subsequent auxiliary upright posts 3 to move onto the unfolded protective net 2, and they are equidistantly arranged after the connecting rope 31 is fully unfolded to maintain the stability of the unfolded protective net 2.

[0037] When using the device, arrange the main column 1 at the front of the construction area and fix the main column 1 through the first insertion column 12. The unused auxiliary columns 3 on both sides of the main column 1 are limited by the spring telescopic plate 19 and the elastic buckle 110. Under the pulling of an external force, the elastic buckle 110 can be squeezed and deformed to allow the auxiliary column 3 to be removed. The elasticity of the spring telescopic plate 19 automatically adjusts the length to limit the remaining auxiliary columns 3. When initially stored near the main column 1, the connecting rope 31 is in a slack state. Pull from the outermost auxiliary column 3. As the protective net 2 and the pulling rope 16 are unfolded, the number of auxiliary columns 3 required gradually increases. Use the pulling rope 16 to pull the subsequent auxiliary columns 3 to move onto the unfolded surface of the protective net 2, and set them at equal intervals after the connecting rope 31 is fully unfolded to maintain the stability of the protective net 2 after unfolding. Pull the auxiliary column 3 to move, and unwind the pulling rope 16 and the protective net 2 by an appropriate length to wrap the entire construction area. Adjust the range and shape of the protective net 2 wrapped by multiple auxiliary columns 3 to meet the protection requirements of construction sites with different shapes and areas. Fix the auxiliary column 3 at the corresponding position to keep the protective net 2 taut. When the auxiliary column 3 moves to a suitable position and the connecting rope 31 is taut, rotate the bidirectional screw 313. The tops of the two sliding frames 312 cooperate with the bidirectional screw 313 to drive the insertion rod 311 and the clamping frame 310 to clamp and fix the pulling rope 16 inside the connecting ring 39. During the horizontal movement of the sliding frame 312, the first connecting rod 315 drives the vertical plate 316 at the bottom to descend. Insert the second insertion column 36 through the jack of the contact pad 35 into the ground in advance to perform a simple initial fixation on the auxiliary column 3. During the process of the pulling rope 16 driving the connecting ring 39 to move, the two inclined blocks 318 at the bottom of the connecting ring 39 slide along the inclined surface of the inclined plate 317 of the clamping plate 37. Through the cooperation of their inclined surfaces, the inclined plate 317 drives the clamping plate 37 to move closer to the protective net 2 to clamp and fix both sides of the protective net 2, maintaining the tautness of the protective net 2 between the two groups of auxiliary columns 3. The insertion frame 38 moves together with the clamping plate 37. The second connecting rod 321 at the bottom of the insertion frame 38 drives the connecting plate 323 to slide downward along the guiding frame 322. The contact pad 35 contacts the ground, and at the same time, the braking block 320 frictionally contacts the top of the pulley 34 to brake the pulley 34. Increase the friction with the ground by setting friction lines on the surface of the contact pad 35, and further cooperate with the second insertion column 36 to strengthen the stability of the auxiliary column 3, thereby protecting the construction area.

[0038] The foregoing has shown and described the basic principles, main features and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms.

[0039] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A safety protection device for road and bridge construction, comprising a main column (1), characterized in that: A bottom plate (11) is fixed on both sides of the bottom of the main column (1), and a first plug column (12) is slidably plugged on the bottom plate (11). Storage grooves (17) are provided on both sides of the main column (1), and a reel (18) is rotatably installed inside the storage groove (17). A protective net (2) is rolled up on the reel (18). A plurality of groups of auxiliary columns (3) are provided on the outside of the protective net (2). The auxiliary columns (3) include a vertical frame (32). A through groove (33) is provided in the middle of the vertical frame (32), and the protective net (2) slides through the through groove (33). Four pulleys (34) are installed at the bottom of the vertical frame (32), and the vertical frame (32) is provided with a plurality of groups of auxiliary columns (3). 2) contact pads (35) are provided on both sides of the bottom, a connecting ring (39) is fixed on the top of the vertical frame (32), a pull rope (16) passes through the inside of the connecting ring (39), a fixed column (13) is fixed on the top of one side of the main column (1), a warning light (14) is installed on the top of the fixed column (13), and a winding seat (15) is rotatably installed on the top of the other side of the main column (1), one end of the pull rope (16) is fixedly connected to the fixed column (13), and the other end of the pull rope (16) is wound inside the winding seat (15), and clamping plates (37) are provided on both sides of the through groove (33), and the protective net (2) is clamped between the two clamping plates (37).

2. A safety protection device for road and bridge construction according to claim 1, characterized in that: Spring telescopic plates (19) are fixed to the outer surfaces of both sides of the main column (1), and elastic buckle blocks (110) are fixed to the extended ends of the spring telescopic plates (19), and the elastic buckle blocks (110) are clamped with the side edges of the auxiliary columns (3) on both sides of the main column (1).

3. The safety protection device for road and bridge construction according to claim 1 is characterized in that: The secondary column (3) further comprises a plug-in rack (38), the plug-in rack (38) being slidably plugged into the surface of the outer side of the vertical frame (32) corresponding to the clamping plate (37), and the plug-in rack (38) being fixedly connected to the clamping plate (37), a second connecting rod (321) being rotatably mounted on the bottom of the plug-in rack (38) via a rotating shaft, the bottom of the second connecting rod (321) being rotatably connected to a connecting plate (323) via a rotating shaft, and the bottom of the connecting plate (323) being fixedly connected to the contact pad (35).

4. A safety protection device for road and bridge construction according to claim 3, characterized in that: A guide frame (322) is fixed on the outer side of the vertical frame (32) corresponding to the path of movement of the connecting plate (323), and the connecting plate (323) slides inside the guide frame (322). A brake block (320) is fixed on the inner side of the contact pad (35) at the top of the pulley (34).

5. The safety protection device for road and bridge construction according to claim 4 is characterized in that: The top of the vertical frame (32) is provided with an opening, and an inclined plate (317) is fixed to the top of the clamping plate (37); an inclined block (318) is fixed to the bottom of the connecting ring (39) at positions corresponding to the two inclined plates (317), and the inclined block (318) slides along the inclined surface of the inclined plate (317); a return spring (319) is fixed to the top of the vertical frame (32), and the other end of the return spring (319) is fixedly connected to the connecting ring (39).

6. A safety protection device for road and bridge construction according to claim 5, characterized in that: Two clamping frames (310) are symmetrically arranged inside the connecting ring (39), and an insertion rod (311) is fixed on the outside of the clamping frame (310). The insertion rod (311) slides through the connecting ring (39). Sliding frames (312) are arranged on both sides of the top of the vertical frame (32), and a sliding block (314) is slidably connected inside the sliding frame (312). The sliding block (314) is fixedly connected to the insertion rod (311).

7. A safety protection device for road and bridge construction according to claim 6, characterized in that: A bidirectional screw (313) is rotatably mounted on the top of the vertical frame (32) via a bearing seat, and the top of the sliding frame (312) is threadedly sleeved on the surface of the bidirectional screw (313).

8. The safety protection device for road and bridge construction according to claim 7 is characterized in that: The bottom of the sliding frame (312) is symmetrically rotatably connected to two first connecting rods (315) via a rotating shaft, and the other end of the first connecting rod (315) is rotatably connected to a vertical plate (316) via a rotating shaft.

9. A safety protection device for road and bridge construction according to claim 8, characterized in that: A second plug post (36) is fixed to the bottom of the vertical plate (316), a plug hole is provided on the surface of the contact pad (35) at a position corresponding to the second plug post (36), and the second plug post (36) slides through the plug hole of the contact pad (35).

10. A safety protection device for road and bridge construction according to claim 9, characterized in that: A connecting rope (31) is fixed on the side wall of the adjacent vertical frame (32).

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