Safety protection device for road and bridge construction

Abstract

A road and bridge construction safety protection device comprises a protective fence, a position control shaft rod, a fixed baffle, a pull ring, a positioning lock sleeve, a driving gear disc, a driven gear disc and a fixed cover plate, a protective net is connected into the protective fence, a connecting lug is arranged on one side of the protective fence, a connecting block is arranged on the other side of the protective fence, and the connecting lug is connected with the connecting block through the position control shaft rod. The position control shaft rod is sequentially connected with the connecting lug and the connecting block, the connecting block is provided with a position control protruding block, the position control shaft rod is provided with a position control groove, the position control protruding block is matched with the position control groove, the position control protruding block is connected with the position control groove, the position control shaft rod is provided with a movable pressing plate, the lower portion of the movable pressing plate is attached to the connecting lug, the connecting lug is provided with a sliding way, and the sliding way is matched with the movable pressing plate. A movable pull rod is arranged on the upper portion of the movable pressing plate and sequentially penetrates through a spring strip, the fixed baffle and the fixed cover plate, the lower end of the spring strip is connected with the movable pressing plate, and the upper end of the spring strip is connected with the fixed baffle.

Description

Technical Field

[0001] The utility model relates to the field of road and bridge construction, in particular to a road and bridge construction safety protection device. Background Art

[0002] The existing patent (publication number: CN211369797U) proposes a safety protection device for road and bridge construction, including a fence body; the fence body is composed of two mutually symmetrical fence frames, and the lower inner ends of the two fence frames are welded with reinforcement rods, one of the fence frames and the inner end of the reinforcement rod are welded with upper short tubes, and the other fence frame and the inner end of the reinforcement rod are welded with lower short tubes. However, in this device, "locking bars are inserted into the insertion tube, and the top of the locking bars are placed against the top of the sliding tube, and then the bottom of the locking bars are inserted into the ground, and the fence body can be spliced ​​together". The locking bars can only increase the connection fulcrum between adjacent fences, and cannot brake and lock the enclosure angle between the fences, resulting in the fence being easily rotated and offset around the steel bar when affected by wind or other external forces, affecting the stability of the enclosure range of road and bridge construction safety protection, and there are disadvantages. Summary of the invention

[0003] The utility model aims at the above-mentioned deficiencies in the prior art and provides a kind of road and bridge construction safety protection device for enclosing the construction range of a road and bridge to prevent non-operating personnel or vehicles from mistakenly entering, thereby improving the safety of the road and bridge construction. The utility model can flexibly adjust the splicing and enclosure angles between guardrails and brake lock according to the actual safety protection area of ​​the road and bridge construction, thereby ensuring the stability of the safety protection range of the road and bridge construction and preventing the guardrails from rotating and deviating at the enclosure angle when being affected by wind or other external forces. The control shaft rod has convenient control adjustment, which is convenient for the guardrails to be inserted and connected and quickly disassembled and assembled, thereby improving the splicing and enclosure speed of the guardrails and accelerating the efficiency of setting up the safety guardrails for road and bridge construction.

[0004] The purpose of this utility model is achieved through the following technical solutions:

[0005] A road and bridge construction safety protection device comprises a guardrail, a position control shaft rod, a fixed baffle, a pull ring, a positioning lock sleeve, a driving gear plate, a driven gear plate, and a fixed cover plate. The guardrail is internally connected to a protective net, one side of the guardrail is provided with a connecting ear, and the other side of the guardrail is provided with a connecting block. The connecting ear is connected to the connecting block through the position control shaft rod, and the position control shaft rod is sequentially connected to the connecting ear and the connecting block. The connecting block has a position control protrusion, and the position control shaft rod has a position control groove. The position control protrusion is adapted to the position control groove, and the position control protrusion is connected to the position control groove. The position control shaft rod has a movable pressure plate, and the lower part of the movable pressure plate fits the connecting ear. The connecting ear has a slideway, and the slideway is adapted to the movable pressure plate. The movable pressure plate is connected to the slideway, and the movable pressure plate slides in the slideway. The upper part of the movable pressure plate is provided with a movable pull rod, and the movable pull rod passes through a spring bar, a fixed baffle plate, and a fixed cover plate in sequence. The lower end of the spring bar is connected to the movable pressure plate, and the upper end of the spring bar is connected to the fixed baffle plate. The utility model discloses a fixed baffle having a connecting ear at the bottom, a fixed cover plate at the top, a fixed cover plate fitted with a pull ring, a pull ring connected to a movable pull rod, the connecting ear has a plurality of fastening support rods, the fixed baffle has a plurality of lower through holes, the fixed cover plate has a plurality of upper through holes, the upper through holes and the lower through holes are adapted to the fastening support rods, the fastening support rods pass through the lower through holes and the upper through holes in turn, and the fastening support rods are connected to the fastening nut through threads.

[0006] The utility model describes that the fixed baffle has an outer support sleeve on the outside, the outer support sleeve fits the driven gear plate, the driven gear plate has a positioning support rod, the positioning support rod is sequentially connected to the outer support sleeve and the fixed baffle, the positioning support rod is connected to the inside of the positioning lock sleeve through a thread, the outside of the positioning lock sleeve fits the fixed baffle, the movable pull rod has a plurality of positioning lock grooves, the positioning lock grooves are adapted to the positioning lock sleeve, and the positioning lock grooves are connected to the positioning lock sleeve.

[0007] Beneficial effects:

[0008] 1. The utility model increases the connecting fulcrum between adjacent guardrails by enclosing the road and bridge construction range to prevent non-operating personnel or vehicles from mistakenly entering, thereby improving the safety of road and bridge construction. The control shaft rod is longitudinally controlled by a pull ring. When the pull ring is pulled outward until the control shaft rod is completely separated from the connecting block, the connecting fulcrum between adjacent guardrails disappears, which is convenient for quick disassembly and splicing of guardrails, so that the number of guardrails can be flexibly increased or decreased according to the actual protection area of ​​road and bridge construction, and the operation is convenient.

[0009] 2. The connecting block of the utility model adjusts the relative angle between adjacent guardrails by rotating on the control shaft rod to meet the safety protection enclosure requirements of different road and bridge construction areas. The structure is flexible, and the control shaft rod and the connecting block are embedded and plugged in, with precise positioning, which is convenient for fast and accurate docking and installation between components, and provides a force fulcrum for the movable pull rod to rotate synchronously with the connecting block, so that when the positioning lock sleeve is embedded in the positioning lock groove to position and support the movable pull rod, the position of the connecting block is synchronously braked and locked to support the enclosure angle between adjacent guardrails, thereby preventing the enclosure angle from rotating and deviating when the guardrail is affected by wind or other external forces, thereby improving the stability of the safety protection range of road and bridge construction.

[0010] 3. The driving gear plate and the driven gear plate of the utility model are meshed and connected, so that when the driving gear plate is driven to rotate by rotating the rotating wheel, the driven gear plate and the positioning support rod are linked, and the positioning support rod is positioned and connected with the positioning lock sleeve through a thread, so that when the positioning support rod rotates, the positioning lock sleeve performs a lateral linear displacement movement, and when the positioning lock sleeve moves outward until it is completely separated from the movable pull rod, the designated fulcrum of the movable pull rod disappears. At this time, the splicing and enclosure angle between adjacent guardrails can be adjusted accordingly according to the actual safety protection area of ​​the road and bridge construction. , improving the flexibility of the structure, and when the positioning lock sleeve moves inwardly to the point where it is embedded in the upper positioning lock groove, a fixed baffle can be added to the braking fulcrum of the movable pull rod, and the enclosure angle between the guardrails on both sides can be locked, thereby improving the stability of the safety protection range of road construction, and when the positioning lock sleeve moves inwardly to the point where it is embedded in the lower positioning lock groove, the longitudinal positioning support force point of the movable pull rod can be increased, so that the control shaft rod remains in a retracted state, which is convenient for the connection block and the connection ear to be inserted into and quickly disassembled and assembled, thereby improving the splicing and enclosure speed of the guardrail, and accelerating the efficiency of setting up safety guardrails for road and bridge construction.

[0011] 4. The fixed cover plate of the utility model provides an installation fulcrum for the lifting and positioning control of the driving gear plate, and the limit clamping plate it has increases the connection fulcrum between the fixed baffle and the positioning support rod, and limits the position of the driven gear plate to keep its lateral position unchanged, and perform axial rotation adjustment to avoid its movement and displacement, which affects the linkage effect between the components and improves the structural stability.

[0012] 5. The utility model encloses the scope of road and bridge construction to prevent non-operating personnel or vehicles from mistakenly entering, thereby improving the safety of road and bridge construction. According to the actual safety protection area of ​​road and bridge construction, the splicing and enclosure angles between guardrails can be flexibly adjusted and braked and locked to ensure the stability of the safety protection range of road and bridge construction, and to prevent the guardrails from rotating and offsetting at the enclosure angle when affected by wind or other external forces. The control axis is easy to adjust, which is convenient for the insertion and docking of guardrails and quick disassembly and assembly, thereby improving the splicing and enclosure speed of guardrails and accelerating the efficiency of setting up safety guardrails for road and bridge construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The utility model is a schematic structural diagram of a road and bridge construction safety protection device.

[0014] Figure 2 This is a structural sectional view of a road and bridge construction safety protection device described in the utility model.

[0015] Figure 3 The figure is a schematic diagram of the position control structure of the position control shaft rod described in the utility model.

[0016] Figure 4 This is a schematic diagram of the fixed cover plate structure of the utility model.

[0017] Figure 5 This is a cross-sectional view of the connection structure of the connection block and the position-controlling shaft rod described in the utility model.

[0018] Figure 6 This is a cross-sectional view of the movable pull rod positioning structure described in the utility model.

[0019] Figure 7 This is a cross-sectional view of the driving shaft limiting structure described in the utility model.

[0020] Figure 8 This is a schematic diagram of the structure of the guardrail, fixed baffle and fixed cover plate described in the utility model.

[0021] Fig. 9 This is a schematic diagram of the position control shaft structure described in the utility model.

[0022] Fig.10 It is an exploded view of the position-controlling structure of the position-controlling shaft rod described in the present utility model.

[0023] Fig.11 For the utility model Figure 2 A magnified view of the local structure. DETAILED DESCRIPTION

[0024] The utility model is further described in detail below according to the accompanying drawings and embodiments:

[0025] Embodiment 1:

[0026] A road and bridge construction safety protection device comprises a guardrail 02, a position control shaft rod 05, a fixed baffle 11, a pull ring 16, a positioning lock sleeve 18, a driving gear plate 20, a driven gear plate 21, and a fixed cover plate 23. The guardrail 02 is internally connected to a protective net 01, one side of the guardrail 02 is provided with a connecting ear 03, and the other side of the guardrail 02 is provided with a connecting block 04. The connecting ear 03 is connected to the connecting block 04 through the position control shaft rod 05. The position control shaft rod 05 is sequentially connected to the connecting ear 03 and the connecting block 04. The connecting block 04 has a position control protrusion 06, and the position control shaft rod 05 has a position control groove 07. The position control protrusion 06 is adapted to the position control groove 07, and the position control protrusion 06 is connected to the position control groove 07. The position control shaft rod 05 has a movable pressing plate 08, and the lower part of the movable pressing plate 08 is fitted with the connecting ear 03. The connecting ear 03 has a slideway 33, and the slideway 33 is adapted to the movable pressing plate 08. 8 is connected to the slideway 33, and the movable pressure plate 08 slides in the slideway 33. The upper part of the movable pressure plate 08 is provided with a movable pull rod 10, and the movable pull rod 10 passes through the spring bar 09, the fixed baffle 11, and the fixed cover plate 23 in sequence. The lower end of the spring bar 09 is connected to the movable pressure plate 08, and the upper end of the spring bar 09 is connected to the fixed baffle 11. The control shaft rod 05 increases the connecting fulcrum between adjacent guardrails 02, and the road and bridge construction range is enclosed to prevent non-operating personnel or vehicles from entering by mistake, thereby improving the safety of road and bridge construction. The control shaft rod 05 is longitudinally controlled by the pull ring 16. When the pull ring 16 is pulled outward until the control shaft rod 05 is completely separated from the connecting block 04, the connecting fulcrum between the adjacent guardrails 02 disappears, which is convenient for the quick disassembly and assembly of the guardrails 02, so that the number of guardrails 02 can be flexibly increased or decreased according to the actual protection area of ​​the road and bridge construction, and the operation is convenient.

[0027] Embodiment 2:

[0028] The lower part of the fixed baffle plate 11 of the utility model is connected to the connecting ear 03, and the upper part of the fixed baffle plate 11 is connected to the fixed cover plate 23. The fixed cover plate 23 fits the pull ring 16, and the pull ring 16 is connected to the movable pull rod 10. The connecting ear 03 has a plurality of fastening support rods 12, the fixed baffle plate 11 has a plurality of lower through holes 14, and the fixed cover plate 23 has a plurality of upper through holes 15. The upper through holes 15 and the lower through holes 14 are adapted to the fastening support rods 12. The fastening support rods 12 pass through the lower through holes 14 and the upper through holes 15 in sequence. The fastening support rods 12 are connected to the fastening nuts 13 through threads. The fixed cover plate 23 provides an installation fulcrum for the lifting and positioning control of the driving gear plate 20, and the limiting card plate 30 it has increases the connection fulcrum between the fixed baffle plate 11 and the positioning support rod 19, and limits the position of the driven gear plate 21 to keep its lateral position unchanged, and perform axial rotation adjustment to avoid its displacement, thereby affecting the linkage effect between the components and improving the structural stability.

[0029] Embodiment 3:

[0030] The utility model said fixed baffle plate 11 has an outer support sleeve 22 on the outside, the outer support sleeve 22 fits the driven gear plate 21, the driven gear plate 21 has a positioning support rod 19, the positioning support rod 19 is sequentially connected to the outer support sleeve 22 and the fixed baffle plate 11, the positioning support rod 19 is connected to the inside of the positioning lock sleeve 18 by a thread, the positioning lock sleeve 18 fits the fixed baffle plate 11 on the outside, the movable pull rod 10 has a plurality of positioning lock grooves 17, the positioning lock grooves 17 are adapted to the positioning lock sleeve 18, the positioning lock grooves 17 are connected to the positioning lock sleeve 18, the connecting block 04 is rotated on the control shaft rod 05 to adjust the relative angle between the adjacent guardrails 02 to meet the requirements of different roads. The safety protection enclosure requirements of the bridge construction area are met with a flexible structure, and the control shaft 05 and the connecting block 04 are embedded and plugged in with precise positioning, which facilitates quick and accurate docking and installation between components, and provides a force fulcrum for the movable pull rod 10 to rotate synchronously with the connecting block 04. When the positioning lock sleeve 18 is embedded in the positioning lock groove 17 to position and support the movable pull rod 10, the position of the connecting block 04 is synchronously braked and locked to support the enclosure angle between adjacent guardrails 02, thereby preventing the guardrail 02 from rotating and deviating from the enclosure angle when it is affected by wind or other external forces, thereby improving the stability of the safety protection range of road and bridge construction.

[0031] Embodiment 4:

[0032] The utility model described in the fixed cover plate 23 has a limit card plate 30, the fixed baffle plate 11 has a limit card plate through hole 32, the positioning support rod 19 has a limit card slot 31, the limit card slot 31, the limit card plate through hole 32 and the limit card plate 30 are adapted, the limit card plate 30 passes through the limit card plate through hole 32, the limit card plate 30 is connected to the limit card slot 31, the fixed cover plate 23 has a lifting support plate 24, the upper part of the lifting support plate 24 is attached to the rotating wheel 34, the lower part of the lifting support plate 24 has a fastening support sleeve 35, the driving shaft 29 is arranged according to The driving shaft 29 passes through the fastening support sleeve 35 and the lifting support plate 24 for the first time. The upper end of the driving shaft 29 is connected to the rotating wheel 34. The lower end of the driving shaft 29 has a driving gear plate 20. The driving gear plate 20 is meshed with the driven gear plate 21. The driving gear plate 20 is connected to the driven gear plate 21. The driving gear plate 20 and the driven gear plate 21 are meshed and connected. When the driving gear plate 20 is driven to rotate by rotating the rotating wheel 34, the driven gear plate 21 and the positioning support rod 19 are linked. The positioning support rod 19 is connected to the positioning lock by a thread. The positioning lock sleeve 18 is positioned and connected, so that when the positioning support rod 19 rotates, the positioning lock sleeve 18 performs a lateral linear displacement movement. When the positioning lock sleeve 18 moves outward until it is completely separated from the movable pull rod 10, the fulcrum of the movable pull rod 10 disappears. At this time, the splicing and enclosure angle of the adjacent guardrails 02 can be adjusted accordingly according to the actual safety protection area of ​​the road and bridge construction to improve the flexibility of the structure. When the positioning lock sleeve 18 moves inward until it is embedded in the upper positioning lock groove 17, a fixed stop can be added. The plate 11 brakes the fulcrum of the movable pull rod 10 and locks the enclosure angle between the guardrails 02 on both sides, thereby improving the stability of the safety protection range of road construction. When the positioning lock sleeve 18 moves inward to be embedded in the lower positioning lock groove 17, the longitudinal positioning support force point of the movable pull rod 10 can be increased, so that the control shaft rod 05 remains in a retracted state, which is convenient for the connection block 04 and the connecting ear 03 to be inserted into and quickly disassembled, thereby improving the splicing and enclosure speed of the guardrail 02 and accelerating the efficiency of setting up the safety guardrail 02 for road and bridge construction.

[0033] Embodiment 5:

[0034] The fastening support sleeve 35 of the utility model is externally connected to the fastening buckle 25, the fastening buckle 25 has a fastening card plate 26 on the inner side, the fastening support sleeve 35 has fastening card plate through holes 28 on both sides, the driving shaft 29 has a fastening card slot 27, the fastening card slot 27 and the fastening card plate through hole 28 are adapted to the fastening card plate 26, the fastening card plate 26 passes through the fastening card plate through hole 28, and the fastening card plate 26 is connected to the fastening card slot 27. This device encloses the road and bridge construction range to prevent non-operating personnel or vehicles from entering by mistake, thereby improving The safety of road and bridge construction can be improved by flexibly adjusting and braking the splicing and enclosure angles of the guardrails 02 according to the actual safety protection area of ​​the road and bridge construction, ensuring the stability of the safety protection range of the road and bridge construction, and avoiding the guardrails 02 from rotating and offsetting at the enclosure angle when affected by wind or other external forces. The control axis 05 is easy to adjust, which is convenient for the guardrails 02 to be inserted, connected and quickly disassembled, thereby improving the splicing and enclosure speed of the guardrails 02 and accelerating the efficiency of setting up the safety guardrails 02 for road and bridge construction.

[0035] Embodiment 6:

[0036] Installation steps: First, assemble the positioning lock sleeve 18 control structure, first place the rotating wheel 34 on the upper part of the lifting support plate 24, and the lower surface of the rotating wheel 34 is in contact with the upper surface of the lifting support plate 24, then place the driving gear plate 20 on the lower part of the lifting support plate 24, and the driving shaft 29 passes through the fastening support sleeve 35 and the lifting support plate 24 from bottom to top, and is fixedly connected with the rotating wheel 34, the fastening slot 27 corresponds to the position of the fastening card plate through hole 28, and then place the fastening buckle 25 outside the fastening support sleeve 35, and the fastening buckles 25 on both sides are oppositely buckled. The fastening card plate 26 is inserted through the fastening card plate through hole 28 and embedded in the fastening card slot 27, and then the positioning support rod 19 is sequentially inserted through the outer support sleeve 22 and the fixed baffle 11 until the driven gear plate 21 fits with the outer surface of the outer support sleeve 22, and the position-limiting card plate through hole 32 corresponds to the position of the position-limiting card slot 31, and then the fixed cover plate 23 is placed on the upper part of the fixed baffle 11, and the position-limiting card plate 30 is inserted through the position-limiting card plate through hole 32 and embedded in the position-limiting card slot 31, and the driving gear plate 20 is meshed with the driven gear plate 21, and the upper through hole 15 is connected with the lower through hole 14 position corresponding, finally the positioning lock sleeve 18 is placed in the fixed baffle 11, and the positioning lock sleeve 18 is sleeved on the outside of the positioning support rod 19, and is positioned and connected with it through a thread. After the positioning lock sleeve 18 control structure is assembled, the movable pressure plate 08 is placed in the slideway 33, and the control shaft rod 05 passes through the connecting ear 03, and then the spring bar 09 is placed in the connecting ear 03, and the spring bar 09 is sleeved on the outside of the movable pull rod 10, and then the fixed baffle 11 is placed on the upper part of the connecting ear 03, and the movable pull rod 10 passes through the fixed baffle 11 and the fixed cover plate in sequence. 23, the positioning lock groove 17 corresponds to the position of the positioning lock sleeve 18, the fastening support rod 12 passes through the lower through hole 14 and the upper through hole 15 in turn, and is fixedly connected with the fastening nut 13 through a thread, and then the pull ring 16 is placed on the upper part of the fixed cover plate 23 and fixedly connected with the movable pull rod 10, and then the connecting block 04 is placed in the connecting ear 03, and the control shaft rod 05 is inserted into the connecting block 04, and the control protrusion 06 is embedded in the control groove 07, and finally the positioning lock sleeve 18 is driven to move to its embedded position in the positioning support rod 19 by rotating the rotating wheel 34 to complete the installation.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as within the protection scope of the present invention.

Claims

1. A road and bridge construction safety protection device, characterized in that The invention comprises a guardrail (02), a position-controlling shaft (05), a fixed baffle (11), a pull ring (16), a positioning lock sleeve (18), a driving gear plate (20), a driven gear plate (21), and a fixed cover plate (23). The guardrail (02) is internally connected to the protection net (01). One side of the guardrail (02) has a connecting ear (03). The other side of the guardrail (02) has a connecting block (04). The connecting ear (03) is connected to the protection net (01) through the position-controlling shaft (05). 5) connected to the connecting block (04), the control shaft rod (05) is connected to the connecting ear (03) and the connecting block (04) in sequence, the connecting block (04) has a control protrusion (06), the control shaft rod (05) has a control groove (07), the control protrusion (06) is adapted to the control groove (07), the control protrusion (06) is connected to the control groove (07), the control shaft rod (05) has a movable pressure plate (08), the lower part of the movable pressure plate (08) is attached The connecting ear (03) is provided with a slideway (33), the slideway (33) is adapted to the movable pressing plate (08), the movable pressing plate (08) is connected to the slideway (33), the movable pressing plate (08) slides in the slideway (33), the upper part of the movable pressing plate (08) is provided with a movable pull rod (10), the movable pull rod (10) passes through the spring strip (09), the fixed baffle (11), and the fixed cover plate (23) in sequence, and the lower end of the spring strip (09) is connected to the fixed baffle (11) and the fixed cover plate (23). The movable pressure plate (08) is connected to the upper end of the spring bar (09) and is connected to the fixed baffle (11). The lower part of the fixed baffle (11) is connected to the connecting ear (03). The upper part of the fixed baffle (11) is connected to the fixed cover plate (23). The fixed cover plate (23) is fitted with a pull ring (16). The pull ring (16) is connected to the movable pull rod (10). The connecting ear (03) has a plurality of fastening support rods (12). The fixed baffle (11) has a plurality of lower through holes (14).

2. A road and bridge construction safety protection device according to claim 1, characterized in that The fixed cover plate (23) has a plurality of upper through holes (15), the upper through holes (15) and the lower through holes (14) are adapted to the fastening support rod (12), the fastening support rod (12) passes through the lower through holes (14) and the upper through holes (15) in sequence, and the fastening support rod (12) is connected to the fastening nut (13) by threading.

3. A road and bridge construction safety protection device according to claim 2, characterized in that The fixed baffle (11) has an outer support sleeve (22) on the outside, the outer support sleeve (22) fits the driven gear plate (21), the driven gear plate (21) has a positioning support rod (19), the positioning support rod (19) is connected to the outer support sleeve (22) and the fixed baffle (11) in sequence, the positioning support rod (19) is connected to the inside of the positioning lock sleeve (18) through a thread, the outside of the positioning lock sleeve (18) fits the fixed baffle (11), the movable pull rod (10) has a plurality of positioning lock grooves (17), the positioning lock grooves (17) are adapted to the positioning lock sleeve (18), and the positioning lock grooves (17) are connected to the positioning lock sleeve (18).

4. A road and bridge construction safety protection device according to claim 3, characterized in that The fixed cover plate (23) has a limit card plate (30), the fixed baffle plate (11) has a limit card plate through hole (32), the positioning support rod (19) has a limit card slot (31), the limit card slot (31) and the limit card plate through hole (32) are adapted to the limit card plate (30), the limit card plate (30) passes through the limit card plate through hole (32), the limit card plate (30) is connected to the limit card slot (31), the fixed cover plate (23) has a lifting support plate (24), The upper part of the lifting support plate (24) is in contact with the rotating wheel (34), and the lower part of the lifting support plate (24) is provided with a fastening support sleeve (35). The driving shaft (29) passes through the fastening support sleeve (35) and the lifting support plate (24) in sequence. The upper end of the driving shaft (29) is connected to the rotating wheel (34), and the lower end of the driving shaft (29) is provided with a driving gear plate (20). The driving gear plate (20) is meshed with a driven gear plate (21), and the driving gear plate (20) is connected to the driven gear plate (21).

5. A road and bridge construction safety protection device according to claim 4, characterized in that The fastening support sleeve (35) is externally connected to the fastening buckle (25), the fastening buckle (25) has a fastening card plate (26) on the inner side, the fastening support sleeve (35) has fastening card plate through holes (28) on both sides, the driving shaft (29) has a fastening card slot (27), the fastening card slot (27) and the fastening card plate through hole (28) are adapted to the fastening card plate (26), the fastening card plate (26) passes through the fastening card plate through hole (28), and the fastening card plate (26) is connected to the fastening card slot (27).

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