Protective device for bridge construction

Abstract

The invention relates to the technical field of bridge construction, and particularly discloses a bridge construction protection device which comprises a first protection plate and a pair of stand columns. The pair of stand columns is fixedly connected to the outer walls of the two ends of the first protection plate. A lifting groove is formed in the first protection plate; the inner wall of the bottom end of the lifting groove is vertically and rotationally connected with a lead screw. The outer wall of the lead screw is sleeved with a second protection plate. The second protection plate is in threaded transmission fit with the screw rod; the outer wall of the second protection plate is in sliding fit with the inner wall of the lifting groove; a rotating mechanism capable of rotating the screw rod is arranged on the bottom surface of the first protection plate; and the lead screw can be rotated through the rotating mechanism, the second protection plate is promoted to vertically move so that the protection height of the device can be adjusted, and the use diversity of the device is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction, and in particular to a protective device for bridge construction. Background Art

[0002] Bridge construction is the process of building a bridge according to the design content, mainly referring to bridge construction technology, construction organization, construction management, construction quality, etc. During bridge construction, in order to ensure the safety of construction, a guardrail needs to be set up around the bridge construction site to achieve the functions of blocking, warning and safety protection.

[0003] In the prior art, the guardrail for bridge construction is usually of an integral structure. During its use, the height of the guardrail cannot be adjusted according to the distribution of the construction site, thus reducing the diversity of the guardrail during use. Summary of the Invention

[0004] The present application provides a protective device for bridge construction, which can adjust the height of the guardrail according to the situation of the construction site, so as to improve the diversity of the guardrail during use.

[0005] A protective device for bridge construction provided by the present application adopts the following technical solutions: A protective device for bridge construction includes a first protective plate and a pair of columns; the pair of columns are respectively vertically fixed on the outer walls at both ends of the first protective plate; a lifting groove is arranged inside the first protective plate; a lead screw is vertically rotatably connected to the inner wall at the bottom end of the lifting groove; a second protective plate with its top extending to the top of the first protective plate is sleeved on the outer wall of the lead screw; the second protective plate is in threaded transmission cooperation with the lead screw, and the outer wall of the second protective plate is slidably matched with the inner wall of the lifting groove; a rotating mechanism for rotating the lead screw is arranged on the bottom surface of the first protective plate.

[0006] By adopting the above technical solutions, during bridge construction protection, the rotating mechanism arranged at the bottom of the first protective plate can drive the lead screw to rotate, prompting the second protective plate to move along the axial direction of the lead screw, so as to realize the adjustment of the overall protection height of the first protective plate and the second protective plate, so as to be able to realize different-height protection adjustment according to the needs of the construction site, and further improve the diversity of the device in use.

[0007] Preferably, a clamping groove is arranged at the position corresponding to the lead screw on the bottom surface of the first protective plate; the bottom end of the lead screw extends into the clamping groove, and a rectangular groove along the axial direction of the lead screw is arranged inside the bottom end of the lead screw; the rotating mechanism includes a sliding rod and a clamping block; the sliding rod is slidably connected to the inner wall of the rectangular groove, and the bottom end of the sliding rod extends out of the bottom end of the lead screw; the clamping block is fixed on the bottom surface of the sliding rod, and the clamping block can be matched with the inner wall of the clamping groove and clamped in the clamping groove.

[0008] By adopting the above technical solution, when adjusting the protection height, the pull-out block can drive the sliding rod to move along the inner wall of the rectangular groove. After the block is pulled out from the card slot, rotate the block and drive the lead screw to rotate through the sliding rod, so as to adjust the protection height of the second protection plate. When the second protection plate is adjusted to the appropriate height, align the block with the card slot and re-insert it into the inner wall of the card slot to lock the lead screw.

[0009] Preferably, a first magnetic sheet is fixedly connected to the inner wall of the top end of the card slot; a second magnetic sheet that can contact the first magnetic sheet is fixedly connected to the top surface of the block; the end faces of the first magnetic sheet and the second magnetic sheet that are close to each other have opposite magnetic polarities.

[0010] By adopting the above technical solution, when the block is inserted into the card slot, the top surface of the second magnetic sheet contacts the bottom surface of the first magnetic sheet. The magnetic force between the first magnetic sheet and the second magnetic sheet makes the block stable in the card slot, reducing the possibility of the block accidentally falling out of the card slot.

[0011] Preferably, a straight rod is horizontally and fixedly connected to the outer wall of the top end of the second protection plate; a housing is fixedly connected to the outer wall of the bottom end of the first protection plate on the side where the straight rod is located; an opening is provided on the top surface of the housing, and a roller is rotatably connected to the inner side wall of the housing; a protective net is wound around the outer wall of the roller; one end of the protective net passes through the opening and is connected to the outer wall of the straight rod; a driving mechanism capable of driving the roller to rotate and tension the protective net is arranged in the housing.

[0012] By adopting the above technical solution, during the process of adjusting the height of the second protection plate, the second protection plate will drive the protective net to spread. When the height of the second protection plate is adjusted to the appropriate position, the driving mechanism drives the roller to rotate to tension the protective net. The protective net is tensioned to intercept gravel, building materials, etc. at the construction site, reducing the harm caused by falling sundries to vehicles and pedestrians under the bridge, and further improving the overall protection effect of the device.

[0013] Preferably, the driving mechanism includes a first rotating shaft and a locking component; the first rotating shaft is rotatably connected to the inner wall of the housing. A first bevel gear is coaxially fixedly connected to the end of the first rotating shaft close to the roller, and a hand wheel located outside the housing is coaxially fixedly connected to the end of the first rotating shaft far from the first bevel gear; a second bevel gear meshing with the first bevel gear is coaxially fixedly connected to the outer wall of the end of the roller close to the first bevel gear; the locking component is arranged on the outer wall of the end of the roller close to the first bevel gear, and the locking component can lock the roller.

[0014] By adopting the above technical solution, when tensioning the protective net, the first rotating shaft and the first bevel gear can be driven to rotate by rotating the handwheel. Under the meshing cooperation of the first bevel gear and the second bevel gear, the first rotating shaft drives the roller to rotate so as to realize the tensioning of the protective net. After the protective net is tensioned, the roller is locked by the locking assembly, so that the protective net maintains a tensioned state for protection work.

[0015] Preferably, the locking assembly includes a third bevel gear and an electric push rod; the third bevel gear is coaxially sleeved on the outer wall of the end of the roller close to the first bevel gear; the electric push rod is axially installed on the outer wall of the roller, and the output end of the electric push rod is fixedly connected to the end face of the third bevel gear, and the electric push rod can make the third bevel gear mesh with the first bevel gear.

[0016] By adopting the above technical solution, during the rotation of the roller, the second bevel gear and the third bevel gear rotate in the same direction. When the third bevel gear is not meshed with the first bevel gear, the roller is in an unlocked state and can rotate. When the roller needs to be locked, the electric push rod can be used to push the third bevel gear to mesh with the first bevel gear. Through the meshing cooperation of the first bevel gear, the second bevel gear and the third bevel gear, the locking and unlocking of the roller can be conveniently realized.

[0017] Preferably, a lighting warning lamp is arranged on the side wall of the second protective plate.

[0018] By adopting the above technical solution, the arrangement of the lighting warning lamp can provide lighting and warning functions in the night environment, reducing the possibility of accidents in the night environment.

[0019] Preferably, a support plate is fixedly connected to the outer wall of the top of the column; a second rotating shaft is arranged on the top surface of the support plate; a photovoltaic power generation panel is arranged at the top of the second rotating shaft; a storage battery is arranged at the bottom surface of the support plate; the photovoltaic power generation panel is electrically connected to the storage battery; the storage battery is electrically connected to the lighting warning lamp.

[0020] By adopting the above technical solution, the provided photovoltaic power generation panel can absorb solar energy and convert the absorbed solar energy into electrical energy and store it in the storage battery. The electrical energy stored in the storage battery can be used for the power supply of the lighting warning lamp, saving electrical energy and reducing the trouble of external wire pulling for the lighting warning lamp.

[0021] Preferably, the second rotating shaft is rotationally matched with the support plate; a motor electrically connected to the storage battery is arranged on the top surface of the support plate; the output end of the motor is fixedly connected to a driving shaft; a first straight gear is coaxially fixedly connected to the output end of the driving shaft; a second straight gear meshing with the first straight gear is coaxially fixedly connected to the outer wall of the second rotating shaft.

[0022] By adopting the above technical solution, when the photovoltaic power generation panel receives light, the motor can drive the drive shaft and the first straight gear to rotate. Under the meshing cooperation of the first straight gear and the second straight gear, the drive shaft can drive the second rotating shaft and the photovoltaic power generation panel to rotate, adjust the orientation of the photovoltaic power generation panel, extend the time for the photovoltaic power generation panel to receive light, and improve the photoelectric conversion efficiency of the photovoltaic power generation panel.

[0023] In summary, the present application has the following beneficial effects: 1. When adjusting the protection height of the device according to the construction site environment, the rotating mechanism can be used to drive the screw rod to rotate, prompting the second protection plate to move along the axial direction of the screw rod, thereby realizing the adjustment of the overall protection height of the first protection plate and the second protection plate, so as to be able to achieve protection adjustment at different heights according to the needs of the construction site and improve the diversity of device use; 2. When the height of the second protection plate is adjusted, the second protection plate will drive the protection net to spread. When the height of the second protection plate is adjusted to an appropriate position, the drive mechanism is used to drive the roller to rotate to tighten the protection net. Tightening and arranging the protection net can intercept the crushed stones passing through the first protection plate and the second protection plate, further improving the protection effect of the device; 3. The lighting warning lamp can provide lighting and warning functions in the night environment. The photovoltaic power generation panel can absorb solar energy and convert it into electric energy and store it in the storage battery. The electric energy stored in the storage battery can be used to supply power to the lighting warning lamp, thereby reducing power consumption and saving resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a structural schematic diagram of a protection device for bridge construction; Figure 2 is a schematic diagram of the cooperation structure of the screw rod and the rotating mechanism in the present application; Figure 3 is a schematic diagram of the cooperation structure of the screw rod, the slide rod and the slider in the present application; Figure 4 is a schematic diagram of the cooperation structure of the support plate, the photovoltaic power generation panel and the storage battery in the present application; Figure 5 is a schematic diagram of the cooperation structure of the first protection plate, the second protection plate and the protection net in the present application; Figure 6 is a sectional structural schematic diagram of the housing, the roller and the drive mechanism in the present application.

[0025] Description of the reference numerals: 1. First protective plate; 11. Lifting groove; 12. Card slot; 2. Column; 21. Support plate; 22. Second rotating shaft; 221. Second straight gear; 23. Photovoltaic panel; 24. Battery; 25. Motor; 251. Driving shaft; 252. First straight gear; 3. Lead screw; 31. Rectangular groove; 4. Second protective plate; 41. Straight rod; 42. Lighting warning lamp; 5. Rotating mechanism; 51. Slide bar; 52. Block; 53. First magnetic sheet; 54. Second magnetic sheet; 6. Housing; 61. Opening; 62. Roller; 63. Protective net; 7. Driving mechanism; 71. First rotating shaft; 72. Locking assembly; 721. Third bevel gear; 722. Electric push rod; 73. First bevel gear; 74. Handwheel; 75. Second bevel gear. Detailed implementation manners

[0026] The present invention will be further described in detail below with reference to the accompanying drawings. The same components are denoted by the same reference numerals. It should be noted that the terms "front", "rear", "left", "right", "upper", "lower", "bottom surface" and "top surface" used in the following description refer to the directions in the accompanying drawings, and the terms "inner" and "outer" refer to the directions towards or away from the geometric center of a specific component respectively.

[0027] The present invention discloses a protective device for bridge construction, as Figure 1 and Figure 2 shown, including a first protective plate 1, a pair of columns 2, a lead screw 3, a second protective plate 4 and a rotating mechanism 5. A pair of columns 2 are vertically and fixedly connected to the outer walls at both ends of the first protective plate 1. A vertical lifting groove 11 is provided inside the first protective plate 1. The lead screw 3 is vertically rotatably connected to the inner wall of the bottom end of the lifting groove 11. The second protective plate 4 is sleeved on the outer wall of the lead screw 3. The second protective plate 4 is in threaded transmission cooperation with the outer wall of the lead screw 3. The second protective plate 4 is in sliding cooperation with the inner wall of the lifting groove 11. The rotating mechanism 5 is arranged at the bottom of the lead screw 3. The rotating mechanism 5 can drive the lead screw 3 to rotate to realize the locking and unlocking of the lead screw 3.

[0028] When adjusting the protective height of the device according to the construction site environment, the rotating mechanism 5 drives the lead screw 3 to rotate, prompting the second protective plate 4 to move up and down in the vertical direction, so as to realize the adjustment of the overall protective height of the first protective plate 1 and the second protective plate 4, and improve the diversity of the device use.

[0029] As Figure 2 and Figure 3As shown in the figure, a clamping groove 12 is provided at the position on the bottom surface of the first protection plate 1 corresponding to the lead screw 3. The horizontal cross-section of the clamping groove 12 is rectangular. The bottom end of the lead screw 3 extends into the interior of the clamping groove 12. A rectangular groove 31 arranged in the vertical direction is coaxially provided inside the bottom end of the lead screw 3. The rotating mechanism 5 includes a slide bar 51, a clamping block 52, a first magnetic sheet 53 and a second magnetic sheet 54. The slide bar 51 is vertically slidably connected to the inner wall of the rectangular groove 31. The slide bar 51 is in a T shape. The bottom end of the slide bar 51 extends outside the bottom end of the lead screw 3. The clamping block 52 is coaxially fixed on the bottom surface of the slide bar 51. The clamping block 52 can be engaged with the inner wall of the clamping groove 12 and inserted into the clamping groove 12. The first magnetic sheet 53 is fixed on the inner wall of the top end of the clamping groove 12. The second magnetic sheet 54 is fixed on the top surface of the clamping block 52. The top surface of the second magnetic sheet 54 can be in contact with the bottom surface of the first magnetic sheet 53, and the top surface of the second magnetic sheet 54 and the bottom surface of the first magnetic sheet 53 have opposite magnetic polarities.

[0030] When adjusting the height of the second protection plate 4, the clamping block 52 is pulled out from the clamping groove 12, and the lead screw 3 is unlocked. Then, by rotating the clamping block 52 to drive the lead screw 3 to rotate, the second protection plate 4 is promoted to move up and down along the vertical direction of the lead screw 3 for height adjustment. After the second protection plate 4 is adjusted to the appropriate height, the clamping block 52 is aligned with the clamping groove 12 and reinserted into the clamping groove 12 to lock the lead screw 3, and the clamping block 52 is kept stable in the clamping groove 12 by the magnetic attraction between the first magnetic sheet 53 and the second magnetic sheet 54.

[0031] As Figure 1 and Figure 4 shown in the figure, a pair of lighting warning lights 42 for lighting are provided on the outer wall near the top end of the second protection plate 4. On the top outer walls of the two columns 2 on the side far from the lighting warning lights 42, support plates 21 are horizontally fixed. A second rotating shaft 22 is vertically rotatably connected to the top surface of the support plate 21. An inclined photovoltaic panel 23 is provided at the top end of the second rotating shaft. A storage battery 24 is installed on the bottom surface of the support plate 21. The photovoltaic panel 23 is electrically connected to the storage battery 24, and the storage battery 24 is electrically connected to the lighting warning lights 42. The storage battery 24 is used to supply power to the lighting warning lights 42.

[0032] The lighting warning lights 42 can provide lighting and warning functions in the night environment. The photovoltaic panel 23 can absorb solar energy and convert it into electrical energy, which is stored in the storage battery 24. The electrical energy stored in the storage battery 24 can be used to supply power to the lighting warning lights 42, thereby reducing power consumption and saving resources.

[0033] As Figure 1 and Figure 4 shown in the figure, a motor 25 is vertically provided on the top surface of the support plate 21. The output end of the motor 25 is coaxially fixed with a driving shaft 251. A first straight gear 252 is coaxially fixed on the outer wall of the top end of the driving shaft 251. A second straight gear 221 meshing with the first straight gear 252 is coaxially fixed on the outer wall of the second rotating shaft 22.

[0034] The starting motor 25 can drive the drive shaft 251 and the first straight gear 252 to rotate, and drive the second rotating shaft 22 and the photovoltaic panel 23 to rotate through the meshing of the first straight gear 252 and the second straight gear 221, adjust the orientation of the photovoltaic panel 23, extend the illumination time of the photovoltaic panel 23, and thus improve the photoelectric conversion efficiency of the photovoltaic panel 23.

[0035] As Figure 5 and Figure 6 shown, a straight rod 41 is horizontally and fixedly connected to the outer wall of the top end on the side of the second protective plate 4 away from the lighting warning lamp 42. A housing 6 is horizontally and fixedly connected to the outer wall of the bottom end on the side of the first protective plate 1 where the straight rod 41 is located. An opening 61 is provided on the top surface of the housing 6. A roller 62 coaxial with the straight rod 41 is horizontally rotatably connected to the inner side wall of the housing 6. A protective net 63 is wound around the outer peripheral surface of the roller 62. The movable end of the protective net 63 passes through the opening 61 and is connected to the outer wall of the straight rod 41. A driving mechanism 7 capable of rotating and tensioning the roller 62 to tension the protective net 63 is provided inside the housing 6, and the driving mechanism 7 can lock and unlock the roller 62.

[0036] When the height of the second protective plate 4 is adjusted, the second protective plate 4 will drive the protective net 63 to spread. When the height of the second protective plate 4 is adjusted to a suitable position, the driving mechanism 7 drives the roller 62 to rotate to tension the protective net 63. Tensioning and arranging the protective net 63 can intercept the gravel passing through the first protective plate 1 and the second protective plate 4, further improving the protection effect of the device.

[0037] As Figure 5 and Figure 6 shown, the driving mechanism 7 includes a first rotating shaft 71, a first bevel gear 73, a second bevel gear 75 and a locking assembly 72. The first rotating shaft 71 is horizontally rotatably connected to the inner wall of the housing 6 near one end of the roller 62. The axis of the first rotating shaft 71 is perpendicular to the axis of the roller 62. The first bevel gear 73 is coaxially fixedly connected to the outer wall of the end of the first rotating shaft 71 near the roller 62. The second bevel gear 75 is coaxially fixedly connected to the outer wall of the end of the roller 62 near the first bevel gear 73. The second bevel gear 75 meshes with the first bevel gear 73. The locking assembly 72 is arranged on the outer wall of the end of the roller 62 near the first bevel gear 73. The locking assembly 72 can lock and unlock the roller 62. A handwheel 74 located outside the housing 6 is coaxially fixedly connected to the end of the first rotating shaft 71 away from the first bevel gear 73.

[0038] When the locking component 72 does not lock the winding roller 62, the first rotating shaft 71 and the first bevel gear 73 can be driven to rotate by rotating the handwheel 74. Under the meshing cooperation of the first bevel gear 73 and the second bevel gear 75, the first rotating shaft 71 drives the winding roller 62 to rotate so as to realize the tensioning of the protective net 63. After the protective net 63 is adjusted to a proper tensioning state, the winding roller 62 is locked by the locking component 72 so as to make the protective net 63 maintain a good tensioning state.

[0039] As Figure 5 and Figure 6 shown, the locking component 72 includes a third bevel gear 721 and a pair of electric push rods 722. The third bevel gear 721 is coaxially sleeved on the outer wall of the winding roller 62 close to the first bevel gear 73. The pair of electric push rods 722 are horizontally installed on the outer wall of the winding roller 62 through a connecting plate. The two electric push rods 722 are respectively located outside both sides of the winding roller 62. The output ends of the two electric push rods 722 are arranged along the axial direction of the winding roller 62 and are fixedly connected to the end face of the third bevel gear 721. The electric push rod 722 can push the third bevel gear 721 to move to mesh or separate from the first bevel gear 73.

[0040] When the third bevel gear 721 does not mesh with the first bevel gear 73, the winding roller 62 is in an unlocked state and can rotate. When the electric push rod 722 pushes the third bevel gear 721 to mesh with the first bevel gear 73, the winding roller 62 is in a locked state. Through the meshing cooperation of the first bevel gear 73, the second bevel gear 75 and the third bevel gear 721, the locking and unlocking of the winding roller 62 can be conveniently realized.

[0041] Working principle: Install the device at the construction site for protection work. First, adjust the protection height of the second protection plate 4 according to the requirements of the construction site. Pull out the clamping block 52 from the clamping groove 12 to unlock the lead screw 3, then rotate the clamping block 52 and drive the lead screw 3 to rotate through the sliding rod 51, so as to make the second protection plate 4 move up and down along the axial direction of the lead screw 3, thereby realizing the adjustment of the protection height of the second protection plate 4. After the second protection plate 4 is adjusted to a proper height, align the clamping block 52 with the clamping groove 12 and reinsert it into the clamping groove 12 to lock the lead screw 3, and make the clamping block 52 stable in the clamping groove 12 through the magnetic attraction between the first magnetic sheet 53 and the second magnetic sheet 54, so as to make the second protection plate 4 stable; During the adjustment of the protection height of the second protection plate 4, the winding roller 62 is in the unlocked state, and the second protection plate 4 drives the protection net 63 to spread. When the height adjustment of the second protection plate 4 is completed, the first rotating shaft 71 and the first bevel gear 73 are driven to rotate by rotating the handwheel 74. Under the meshing cooperation of the first bevel gear 73 and the second bevel gear 75, the first rotating shaft 71 drives the winding roller 62 to rotate to tighten the protection net 63. After adjusting the spread protection net 63 to an appropriate tension degree, the electric push rod 722 is started to drive the third bevel gear 721 to move and mesh with the first bevel gear 73. Under the meshing cooperation of the first bevel gear 73, the second bevel gear 75 and the third bevel gear 721, the winding roller 62 is locked to make the protection net 63 maintain a good tension state for protection work; The photovoltaic power generation panel 23 provided on the support plate 21 can absorb solar energy and convert it into electric energy, which is stored in the storage battery 24, so that the storage battery 24 can supply power to the lighting warning lamp 42, saving electric energy resources.

[0042] The above are all the preferred embodiments of this application, and the protection scope of this application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A protective device for bridge construction, characterized in that: The invention comprises a first protective plate (1) and a pair of upright posts (2); the pair of upright posts (2) are respectively vertically fixed to the outer walls at both ends of the first protective plate (1); a lifting groove (11) is arranged inside the first protective plate (1); a screw rod (3) is vertically rotatably connected to the inner wall at the bottom end of the lifting groove (11); a second protective plate (4) is sleeved on the outer wall of the screw rod (3) and the top end extends to the top of the first protective plate (1); the second protective plate (4) is threadedly matched with the screw rod (3), and the outer wall of the second protective plate (4) is slidably matched with the inner wall of the lifting groove (11); a rotating mechanism (5) capable of rotating the screw rod (3) is arranged on the bottom surface of the first protective plate (1).

2. A protective device for bridge construction according to claim 1, characterized in that: A slot (12) is provided on the bottom surface of the first protective plate (1) at a position corresponding to the screw rod (3); the bottom end of the screw rod (3) extends into the slot (12), and a rectangular slot (31) along the axis direction of the screw rod (3) is provided inside the bottom end of the screw rod (3); the rotating mechanism (5) comprises a sliding rod (51) and a clamping block (52); the sliding rod (51) is slidably connected to the inner wall of the rectangular slot (31), and the bottom end of the sliding rod (51) extends out of the bottom end of the screw rod (3); the clamping block (52) is fixedly connected to the bottom surface of the sliding rod (51), and the clamping block (52) can cooperate with the inner wall of the slot (12) to be clamped in the slot (12).

3. A protective device for bridge construction according to claim 2, characterized in that: A first magnetic piece (53) is fixedly connected to the inner wall at the top end of the slot (12); a second magnetic piece (54) that can contact the first magnetic piece (53) is fixedly connected to the top surface of the block (52); and the end surfaces of the first magnetic piece (53) and the second magnetic piece (54) that are close to each other have opposite magnetic properties.

4. A protective device for bridge construction according to claim 1, characterized in that: A straight rod (41) is horizontally fixedly connected to the outer wall at the top end of the second protective plate (4); a shell (6) is fixedly connected to the outer wall at the bottom end of the first protective plate (1) on the side where the straight rod (41) is located; an opening (61) is provided on the top surface of the shell (6), and a roller (62) is rotatably connected to the inner wall of the shell (6); a protective net (63) is wound around the outer wall of the roller (62); one end of the protective net (63) passes through the opening (61) and is connected to the outer wall of the straight rod (41); a driving mechanism (7) is provided in the shell (6) and can drive the roller (62) to rotate and tighten the protective net (63).

5. A protective device for bridge construction according to claim 4, characterized in that: The driving mechanism (7) comprises a first rotating shaft (71) and a locking assembly (72); the first rotating shaft (71) is rotatably connected to the inner wall of the housing (6); the end of the first rotating shaft (71) close to the winding roller (62) is coaxially fixedly connected with a first bevel gear (73); the end of the first rotating shaft (71) away from the first bevel gear (73) is coaxially fixedly connected with a hand wheel (74) located outside the housing (6); the outer wall of the end of the winding roller (62) close to the first bevel gear (73) is coaxially fixedly connected with a second bevel gear (75) meshing with the first bevel gear (73); the locking assembly (72) is arranged on the outer wall of the end of the winding roller (62) close to the first bevel gear (73), and the locking assembly (72) can lock the winding roller (62).

6. A protective device for bridge construction according to claim 5, characterized in that: The locking assembly (72) comprises a third bevel gear (721) and an electric push rod (722); the third bevel gear (721) is coaxially sleeved on the outer wall of the end of the roller (62) close to the first bevel gear (73); the electric push rod (722) is axially mounted on the outer wall of the roller (62), the output end of the electric push rod (722) is fixedly connected to the end face of the third bevel gear (721), and the electric push rod (722) can make the third bevel gear (721) mesh with the first bevel gear (73).

7. A protective device for bridge construction according to claim 1, characterized in that: A lighting warning light (42) is provided on the side wall of the second protection plate (4).

8. A protective device for bridge construction according to claim 7, characterized in that: A support plate (21) is fixedly connected to the outer wall of the top end of the column (2); a second rotating shaft (22) is arranged on the top surface of the support plate (21); a photovoltaic power generation panel (23) is arranged on the top end of the second rotating shaft (22); a storage battery (24) is arranged on the bottom surface of the support plate (21); the photovoltaic power generation panel (23) is electrically connected to the storage battery (24); and the storage battery (24) is electrically connected to the lighting warning light (42).

9. A protective device for bridge construction according to claim 8, characterized in that: The second rotating shaft (22) is rotatably matched with the support plate (21); a motor (25) electrically connected to the storage battery (24) is arranged on the top surface of the support plate (21); a driving shaft (251) is fixedly connected to the output end of the motor (25); a first spur gear (252) is coaxially fixedly connected to the output end of the driving shaft (251); and a second spur gear (221) meshing with the first spur gear (252) is coaxially fixedly connected to the outer wall of the second rotating shaft (22).

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