Lifting type safety scaffold for bridge construction and construction method

Abstract

The invention discloses a lifting type safety scaffold for bridge construction and a construction method, the lifting type safety scaffold comprises a mounting plate and a connecting column, a plurality of mounting grooves I are formed in the top of the mounting plate, a sliding column is slidably connected to the interior of each mounting groove I, two rotating grooves are formed in the exterior of each sliding column, and rotating plates are rotatably connected to the interiors of the rotating grooves; an elastic assembly for jacking the rotating plate is fixedly connected to the interior of the rotating groove, a fixing shell is slidably connected to the exterior of the sliding column, clamping grooves are formed in the left side and the right side of the fixing shell correspondingly, a limiting plate is slidably connected to the interior of the sliding column, and a second mounting groove is formed in the bottom of the connecting column; and the outer part of the mounting groove II is rotationally connected with a rotating cylinder. According to the scaffold, the sliding column slides into the fixing shell, so that after the rotating plate reaches the opening of the clamping groove, the cylinder sleeve is matched with the rotating plate through elastic force generated by the spring and then is clamped with the clamping groove, and the scaffold is prevented from shaking.

Description

Technical Field

[0001] The invention relates to the technical field of scaffolding, and in particular to a lifting safety scaffolding for bridge construction and a construction method. Background Art

[0002] The safety scaffolding used in bridge construction is a support system specially designed for use in the process of bridge construction, maintenance or repair. It provides workers with a stable working platform so that they can safely and stably perform aerial operations such as the construction, maintenance or repair of bridge structures. It can be adjusted and adapted to the different shapes and heights of bridge structures to ensure that all areas that need to be worked are covered.

[0003] In the prior art, some lifting safety scaffolds for bridge construction are prone to tipping over during installation due to insufficient support at the bottom, causing harm to the physical and mental health of users. Therefore, in response to the above problems, a lifting safety scaffold for bridge construction is proposed. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a lifting safety scaffolding and construction method for bridge construction, aiming to improve the problems in the prior art that the bottom layer of the scaffolding cannot be limited and fixed to the ground and the protective net cannot be limited and supported.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a lifting safety scaffold for bridge construction, comprising a mounting plate and a connecting column, the top of the mounting plate is provided with a plurality of mounting grooves 1, the interior of the mounting groove 1 is slidably connected with a sliding column, the exterior of the sliding column is provided with two rotating grooves, the interior of the rotating groove is rotatably connected with a rotating plate, the interior of the rotating groove is fixedly connected with an elastic component for pushing the rotating plate, the exterior of the sliding column is slidably connected with a fixed shell, the left and right sides of the fixed shell are provided with card grooves, the interior of the sliding column is slidably connected with a limit plate, the top of the mounting plate is fixedly connected with a mounting component for connecting the connecting column, the bottom of the connecting column is provided with a mounting groove 2, the exterior of the mounting groove 2 is rotatably connected with a rotating cylinder.

[0006] As a further description of the above technical solution: The elastic component comprises a sleeve, the outer portion of the sleeve is fixedly connected to the inner portion of the rotating groove, a spring is arranged inside the sleeve, and a cylindrical sleeve is slidably connected to the inner portion of the sleeve.

[0007] As a further description of the above technical solution: The mounting assembly includes a threaded column 1, the bottom of the threaded column 1 is fixedly connected to the top of the mounting plate, and the top of the threaded column 1 is fixedly connected to a mounting rod.

[0008] As a further description of the above technical solution: The outsides of the two connecting columns are fixedly connected to a fixing block 1, the left side of the fixing block 1 is fixedly connected to an internal threaded tube 1, the internal thread of the internal threaded tube 1 is connected to an external threaded tube, the top of the external threaded tube is connected to an internal threaded tube 2, the top of the internal threaded tube 2 is fixedly connected to a fixing block 2, the adjacent sides of the fixing block 2 and the fixing block 1 are fixedly connected to a traction rope, the top of the fixing block 2 is fixedly connected to a connecting rod, and a protective net is provided on the adjacent sides of the two connecting rods.

[0009] As a further description of the above technical solution: The outside of every four connecting columns is slidably connected to a top plate, the top of one of the top plates is fixedly connected to two guardrail one, the top of one of the top plates is fixedly connected to guardrail two, the adjacent sides of the two connecting columns are fixedly connected to two mounting columns, the internal rotation of the mounting columns is connected to a rotating column, the external sliding connection of the mounting columns is connected to a sliding block, the adjacent sides of the plurality of sliding blocks are fixedly connected to a support beam, the top of the connecting column is fixedly connected to a threaded column two, and the external thread of the threaded column two is connected to a cartridge.

[0010] As a further description of the above technical solution: The outer portion of the rotating plate is rotatably connected to the inner portion of the sliding column, and the outer portion of the rotating plate is fixedly connected to the outer portion of the elastic component.

[0011] As a further description of the above technical solution: One side of the spring is fixedly connected to the inside of the sleeve, and the other side of the spring is fixedly connected to the inside of the cylindrical sleeve.

[0012] As a further description of the above technical solution: The outer portion of the rotating plate is rotatably connected to the inner portion of the clamping slot, and the bottom of the limiting plate is in contact with the top of the mounting plate.

[0013] As a further description of the above technical solution: The outside of the mounting rod is slidably connected to the inside of the second mounting groove, and the outside of the first threaded column is threadedly connected to the inside of the rotating cylinder.

[0014] As a further description of the above technical solution: A handle is fixedly connected to the outside of the external threaded cylinder, and the right side of the connecting rod is rotatably connected to the left side of one of the connecting columns.

[0015] A construction method of a lifting safety scaffold for bridge construction, the specific operation is as follows: when workers need to install the scaffold during bridge construction, they only need to select a plurality of fixed shells and bury them in the installation position first, then slide the sliding column into the installation slot one in cooperation with the top of the fixed shell for installation, then slide the limiting plate into the sliding column and contact the top of the installation plate for limiting fixing, then slide the sliding column into the fixed shell, so that after the rotating plate reaches the opening of the slot, the spring generates elastic force to push the cylindrical sleeve and the rotating plate, so that the rotating plate pops out to engage the slot, and then limits and fixes, so as to prevent the bottom from being unstable, thereby causing the scaffold to shake; Then, when it is necessary to install the connecting column, it is only necessary to align the second installation groove opened inside the connecting column with the outside of the installation rod and slide it in, and then rotate the rotating cylinder outside the second installation groove so that the inside of the rotating cylinder is connected and fixed with the external thread of the threaded column one, and then slide the four sliding blocks fixed on the outside of the support beam to the outside of the multiple fixedly connected installation columns on the side close to the two connecting columns respectively, and then flip the rotating column so that the rotating column limits and fixes the sliding block, so that the support beam limits and supports the two connecting columns, and then slide the top plate to the outside of the four connecting columns, and at the same time, clamp the second threaded column at the top into the clamping cylinder to limit it, and then install the guardrail one on the left and right sides of the top of the top plate, and install the guardrail two on its rear side; Then, a fixed block 1 is fixedly installed on the outside of the two connecting columns on the left side of the top, and then a connecting rod is installed on the left side of the two connecting columns, so that the bottom of the connecting rod is fixedly connected to the top of the fixed block 2. Then, when the angle of the connecting rod needs to be adjusted, you only need to hold the handle on the outside of the external threaded barrel and then rotate it, so that the handle drives the external threaded barrel thread to rotate inside the internal threaded barrel 2 and the internal threaded barrel 1, so that the internal threaded barrel 2 and the internal threaded barrel 1 run in opposite directions to push the connecting rod, and then adjust the angle of the protective net, and at the same time, the traction rope pulls the fixed block 2 and the fixed block 1 to each other, providing reverse traction force, making the connecting rod and the connecting column more stable.

[0016] The present invention has the following beneficial effects: 1. In the present invention, the sliding column slides into the interior of the fixed shell, so that after the rotating plate reaches the opening of the slot, the spring generates elastic force to push the cylindrical sleeve and the rotating plate, so that the rotating plate pops out to engage with the slot, and then limits and fixes it to prevent the bottom from being unstable, thereby causing the scaffolding to shake.

[0017] 2. In the present invention, the second internal threaded barrel and the first internal threaded barrel run in opposite directions to push the connecting rod, and then adjust the angle of the protective net. At the same time, the traction rope pulls the second fixed block and the first fixed block to each other, providing reverse traction force, making the connecting rod and the connecting column more stable.

[0018] 3. In the present invention, the four sliding blocks fixed on the outside of the support beam slide respectively on the outside of the multiple installation columns fixedly connected on the side close to the two connecting columns, and then the rotating columns are flipped so that the rotating columns limit and fix the sliding blocks, thereby allowing the support beam to limit and support between the two connecting columns for quick installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A three-dimensional diagram of a lifting safety scaffold for bridge construction proposed by the present invention; Figure 2 This is a schematic diagram of the mounting plate structure of a lifting safety scaffold for bridge construction according to the present invention; Figure 3 This is a schematic diagram of the sliding column structure of a lifting safety scaffold for bridge construction according to the present invention; Figure 4 This is a schematic diagram of the rotating plate structure of a lifting safety scaffold for bridge construction according to the present invention; Figure 5 for Figure 4 Enlarged view of point A in the middle; Figure 6 This is a schematic diagram of the protective net structure of a lifting safety scaffold for bridge construction according to the present invention; Figure 7 This is a schematic diagram of the structure of an external threaded barrel of a lifting safety scaffold for bridge construction according to the present invention; Figure 8 This is a schematic diagram of the installation column structure of a lifting safety scaffold for bridge construction according to the present invention; Fig. 9 for Figure 8 Enlarged view of point B in the middle.

[0020] Among them: 1. Mounting plate; 2. Mounting slot 1; 3. Sliding column; 4. Rotating slot; 5. Rotating plate; 6. Sleeve; 7. Spring; 8. Cylinder sleeve; 9. Fixed shell; 10. Slot; 11. Limiting plate; 12. Threaded column 1; 13. Mounting rod; 14. Connecting column; 15. Mounting slot 2; 16. Rotating cylinder; 17. Fixed block 1; 18. Internally threaded cylinder 1; 19. Externally threaded cylinder; 20. Internally threaded cylinder 2; 21. Fixed block 2; 22. Traction rope; 23. Connecting rod; 24. Protective net; 25. Guardrail 1; 26. Guardrail 2; 27. Mounting column; 28. Rotating column; 29. ​​Sliding block; 30. Support beam; 31. Threaded column 2; 32. Cylinder; 33. Top plate. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Reference Figure 1 - Figure 3 As shown, an embodiment of the present invention is: a lifting safety scaffold for bridge construction, including a mounting plate 1 and a connecting column 14, the mounting plate 1 is used to support and connect other components, a plurality of mounting grooves 2 are provided on the top of the mounting plate 1, the mounting grooves 2 are for allowing a sliding column 3 to be slidably installed therein, the interior of the mounting grooves 2 is slidably connected with a sliding column 3, the sliding column 3 is for cooperating with a rotating groove 4 to allow a rotating plate 5 to rotate, two rotating grooves 4 are provided on the outside of the sliding column 3, the rotating groove 4 is for fixing a sleeve 6, the interior of the rotating groove 4 is rotatably connected with a rotating plate 5, the exterior of the rotating plate 5 is rotatably connected to the interior of the sliding column 3, the exterior of the rotating plate 5 is fixedly connected to the exterior of the elastic component, and the interior of the rotating groove 4 is fixedly connected with an elastic component for pushing the rotating plate 5.

[0023] Reference Figure 3 - Figure 5 As shown, the elastic component includes a sleeve 6. The sleeve 6 and the cylindrical sleeve 8 are used to prevent the spring 7 from deforming. The outside of the sleeve 6 is fixedly connected to the inside of the rotating groove 4. A spring 7 is arranged inside the sleeve 6. The spring 7 is used to generate elasticity to push the cylindrical sleeve 8 in cooperation with the rotating plate 5, so that the rotating plate 5 pops out. One side of the spring 7 is fixedly connected to the inside of the sleeve 6, and the other side of the spring 7 is fixedly connected to the inside of the cylindrical sleeve 8. The inside of the sleeve 6 is slidably connected with the cylindrical sleeve 8. The outside of the sliding column 3 is slidably connected with a fixed shell 9. The fixed shell 9 is installed at the bridge construction site, and then the sliding column 3 is slid into the inside of the fixed shell 9. The left and right sides of the fixed shell 9 are provided with slots 10, so that the fixed shell 9 cooperates with the slots 10 to engage with the rotating plate 5, so that the connection between the fixed shell 9 and the sliding column 3 and the mounting plate 1 is more stable, and the outside of the rotating plate 5 is rotatably connected to the inside of the slot 10.

[0024] Reference Figure 2 and Figure 8 , Fig. 9As shown, the bottom of the limit plate 11 contacts the top of the mounting plate 1, and the internal sliding connection of the sliding column 3 is connected to the limit plate 11. The limit plate 11 is used to fix the sliding column 3 inside the mounting plate 1. The top of the mounting plate 1 is fixedly connected with a mounting assembly for connecting the connecting column 14. The mounting assembly includes a threaded column 12. The threaded column 12 is used to cooperate with the mounting rod 13 to connect with the connecting column 14. The bottom of the threaded column 12 is fixedly connected to the top of the mounting plate 1. The top of the threaded column 12 is fixedly connected to the mounting rod 13. The outside of the mounting rod 13 is slidably connected to the inside of the mounting groove 2 15. The outside of the threaded column 12 is threadedly connected to the inside of the rotating cylinder 16. The bottom of the connecting column 14 is provided with a mounting groove 2 15. The mounting groove 2 15 is used to slide and engage with the mounting rod 13. The outside of the mounting groove 2 15 is rotatably connected with a rotating cylinder 16. The rotating cylinder 16 is threadedly connected to the threaded column 12.

[0025] Reference Figure 6 - Figure 7 As shown, the outsides of the two connecting columns 14 are fixedly connected with a fixing block 17, and the fixing block 17 is used to fix the internal threaded tube 18. The left side of the fixing block 17 is fixedly connected with an internal threaded tube 18, and the internal threaded tube 18 is used to cooperate with the external threaded tube 19 to connect with the internal threaded tube 20. The internal thread of the internal threaded tube 18 is connected with the external threaded tube 19, and the external threaded tube 19 is used to connect the fixing block 21. The outside of the external threaded tube 19 is fixedly connected with a handle, and the right side of the connecting rod 23 is rotatably connected to the left side of one of the connecting columns 14. The external thread The top of the cylinder 19 is connected to an internally threaded cylinder 20, and the top of the internally threaded cylinder 20 is fixedly connected to a fixed block 21. The adjacent side of the fixed block 21 and the fixed block 17 is fixedly connected to a traction rope 22. The traction rope 22 is used to provide traction between the fixed block 21 and the fixed block 17. The top of the fixed block 21 is fixedly connected to a connecting rod 23. The connecting rod 23 is used to cooperate with the protective net 24 for protection, to prevent the staff from slipping and falling, and to prevent the falling objects from causing injuries to the ground staff. The adjacent side of the two connecting rods 23 is provided with a protective net 24.

[0026] Reference Figure 6 and Figure 8As shown, every four connecting columns 14 are slidably connected to the outside of a top plate 33, and the top plate 33 is used to connect guardrail 1 25 and guardrail 2 26 to protect the staff. The top of one of the top plates 33 is fixedly connected to two guardrails 25, and the top of one of the top plates 33 is fixedly connected to guardrail 2 26. The adjacent sides of the two connecting columns 14 are fixedly connected to two mounting columns 27, and the mounting columns 27 are used to cooperate with the rotating columns 28 to limit and fix the sliding blocks 29. The internal rotation of the mounting columns 27 is connected to the rotating columns 28, and the external sliding connection of the mounting columns 27 is connected to the sliding blocks 29. The sliding blocks 29 are used to cooperate with the support beam 30 to support the connecting columns 14. The adjacent sides of the multiple sliding blocks 29 are fixedly connected to the support beam 30, and the top of the connecting column 14 is fixedly connected to the threaded column 21, and the threaded column 21 is used to cooperate with the support beam 30 to limit the top of the top plate 33, and the external thread of the threaded column 21 is connected to the cartridge 32.

[0027] Working principle: When the staff need to install the scaffolding during the bridge construction, they only need to select a plurality of fixed shells 9 and bury them in the installation place first, then slide the sliding column 3 into the installation slot 2 in cooperation with the top of the fixed shell 9 for installation, then slide the limiting plate 11 into the sliding column 3 and contact the top of the installation plate 1 for limiting fixation, then slide the sliding column 3 into the fixed shell 9, so that after the rotating plate 5 reaches the opening of the slot 10, the spring 7 generates elastic force to push the cylindrical sleeve 8 in cooperation with the rotating plate 5, so that the rotating plate 5 pops up to engage with the slot 10, and then limits and fixes it to prevent the bottom from being unstable, thereby causing the scaffolding to shake; Then, when it is necessary to install the connecting column 14, it is only necessary to align the installation groove 2 15 opened inside the connecting column 14 with the outside of the installation rod 13 and slide it in, and then rotate the rotating cylinder 16 outside the installation groove 2 15 so that the inside of the rotating cylinder 16 is connected and fixed with the external thread of the threaded column 12, and then slide the four sliding blocks 29 fixed on the outside of the support beam 30 respectively on the outside of the multiple fixedly connected installation columns 27 on the side close to the two connecting columns 14, and then flip the rotating column 28 so that the rotating column 28 limits and fixes the sliding block 29, so that the support beam 30 limits and supports the two connecting columns 14, and then slide the top plate 33 on the outside of the four connecting columns 14, and at the same time, the topmost threaded column 2 31 is clamped into the clamping cylinder 32 for limiting, and then install the guardrail 1 25 on the left and right sides of the top of the top plate 33, and install the guardrail 2 26 on its rear side. Then, a fixing block 17 is fixedly installed on the outside of the two connecting columns 14 on the left side of the top, and then a connecting rod 23 is installed on the left side of the two connecting columns 14, so that the bottom of the connecting rod 23 is fixedly connected to the top of the fixing block 21. Then, when the angle of the connecting rod 23 needs to be adjusted, it is only necessary to hold the handle outside the external threaded tube 19 and then rotate it, so that the handle drives the external threaded tube 19 to rotate inside the internal threaded tube 20 and the internal threaded tube 18, so that the internal threaded tube 20 and the internal threaded tube 18 run in opposite directions to push the connecting rod 23, and then adjust the angle of the protective net 24, and at the same time, the traction rope 22 pulls the fixing block 21 and the fixing block 17 to each other, providing a reverse traction force, so that the connecting rod 23 and the connecting column 14 are more stable.

[0028] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A lifting safety scaffold for bridge construction, comprising a mounting plate (1) and a connecting column (14), characterized in that: The top of the mounting plate (1) is provided with a plurality of mounting grooves 1 (2), the interior of the mounting groove 1 (2) is slidably connected to a sliding column (3), the exterior of the sliding column (3) is provided with two rotation grooves (4), the interior of the rotation groove (4) is rotatably connected to a rotating plate (5), the interior of the rotating groove (4) is fixedly connected to an elastic component for pushing up the rotating plate (5), the exterior of the sliding column (3) is slidably connected to a fixed shell (9), the left and right sides of the fixed shell (9) are provided with a clamping groove (10), the interior of the sliding column (3) is slidably connected to a limit plate (11), the top of the mounting plate (1) is fixedly connected to a mounting component for connecting to a connecting column (14), the bottom of the connecting column (14) is provided with a mounting groove 2 (15), the exterior of the mounting groove 2 (15) is rotatably connected to a rotating cylinder (16).

2. The lifting safety scaffold for bridge construction according to claim 1 is characterized in that: The elastic component comprises a sleeve (6), the exterior of the sleeve (6) being fixedly connected to the interior of the rotating groove (4), a spring (7) being arranged inside the sleeve (6), and a cylindrical sleeve (8) being slidably connected to the interior of the sleeve (6).

3. The lifting safety scaffold for bridge construction according to claim 1 is characterized in that: The mounting assembly comprises a threaded column (12), the bottom of the threaded column (12) being fixedly connected to the top of the mounting plate (1), and the top of the threaded column (12) being fixedly connected to a mounting rod (13).

4. The lifting safety scaffold for bridge construction according to claim 1 is characterized in that: The exteriors of the two connecting columns (14) are fixedly connected to a fixing block 1 (17); the left side of the fixing block 1 (17) is fixedly connected to an internal threaded tube 1 (18); the internal thread of the internal threaded tube 1 (18) is connected to an external threaded tube (19); the top of the external threaded tube (19) is connected to an internal threaded tube 2 (20); the top of the internal threaded tube 2 (20) is fixedly connected to a fixing block 2 (21); a traction rope (22) is fixedly connected to the adjacent side of the fixing block 2 (21) and the fixing block 1 (17); a connecting rod (23) is fixedly connected to the top of the fixing block 2 (21); and a protective net (24) is provided on the adjacent side of the two connecting rods (23).

5. The lifting safety scaffold for bridge construction according to claim 1 is characterized in that: Each of the four connecting columns (14) is slidably connected to a top plate (33) on the outside, wherein the top of one of the top plates (33) is fixedly connected to two guardrails (25), wherein the top of one of the top plates (33) is fixedly connected to guardrails (26), and adjacent sides of the two connecting columns (14) are fixedly connected to two mounting columns (27), wherein the interior of the mounting columns (27) is rotatably connected to a rotating column (28), wherein the exterior of the mounting columns (27) is slidably connected to a sliding block (29), and adjacent sides of the plurality of sliding blocks (29) are fixedly connected to a support beam (30), and the top of the connecting column (14) is fixedly connected to a threaded column (31), wherein the exterior of the threaded column (31) is threadedly connected to a cartridge (32).

6. The lifting safety scaffold for bridge construction according to claim 1 is characterized in that: The outside of the rotating plate (5) is rotatably connected to the inside of the sliding column (3), and the outside of the rotating plate (5) is fixedly connected to the outside of the elastic component; the outside of the rotating plate (5) is rotatably connected to the inside of the slot (10), and the bottom of the limiting plate (11) is in contact with the top of the mounting plate (1).

7. The lifting safety scaffold for bridge construction according to claim 2 is characterized in that: One side of the spring (7) is fixedly connected to the inside of the sleeve (6), and the other side of the spring (7) is fixedly connected to the inside of the cylindrical sleeve (8).

8. The lifting safety scaffold for bridge construction according to claim 3 is characterized by: The outside of the mounting rod (13) is slidably connected to the inside of the second mounting groove (15), and the outside of the first threaded column (12) is threadedly connected to the inside of the rotating cylinder (16).

9. The lifting safety scaffold for bridge construction according to claim 4 is characterized in that: A handle is fixedly connected to the outside of the externally threaded cylinder (19), and the right side of the connecting rod (23) is rotatably connected to the left side of one of the connecting columns (14).

10. A construction method of a lifting safety scaffold for bridge construction, characterized in that: The specific operation is as follows: when the staff is constructing a bridge and needs to install the scaffolding, they only need to select a plurality of fixed shells (9) and bury them in the installation position first, then slide the sliding column (3) into the inside of the installation groove (2) in cooperation with the top of the fixed shell (9) for installation, then slide the limiting plate (11) into the inside of the sliding column (3) and contact the top of the installation plate (1) for limiting and fixing, then slide the sliding column (3) into the inside of the fixed shell (9), so that after the rotating plate (5) reaches the opening of the slot (10), the spring (7) generates elastic force to push the cylindrical sleeve (8) in cooperation with the rotating plate (5), so that the rotating plate (5) pops out and engages with the slot (10), and then limits and fixes, so as to prevent the bottom from being unstable, thereby causing the scaffolding to shake; Then, when the connecting column (14) needs to be installed, it is only necessary to align the second installation groove (15) provided inside the connecting column (14) with the outside of the installation rod (13) and slide it in, and then rotate the rotating cylinder (16) outside the second installation groove (15) so that the inside of the rotating cylinder (16) is connected and fixed with the external thread of the first threaded column (12), and then slide the four sliding blocks (29) fixed outside the support beam (30) respectively on the two connecting columns (14) on the side close to the fixed connection of the multiple installation columns. (27) outside, then flip the rotating column (28) so that the rotating column (28) can limit and fix the sliding block (29), so that the support beam (30) can limit and support between the two connecting columns (14), then slide the top plate (33) outside the four connecting columns (14), and at the same time, the topmost threaded column 2 (31) is clamped into the clamping tube (32) to limit the position, and then install the guardrail 1 (25) on the left and right sides of the top of the top plate (33), and install the guardrail 2 (26) on the rear side thereof, Then, a fixing block 1 (17) is fixedly installed on the outside of the two left connecting columns (14) at the top, and then a connecting rod (23) is respectively installed on the left side of the two connecting columns (14), so that the bottom of the connecting rod (23) is fixedly connected to the top of the fixing block 2 (21). Then, when it is necessary to adjust the angle of the connecting rod (23), it is only necessary to hold the handle outside the external threaded tube (19) and then rotate it, so that the handle drives the external threaded tube (19) to rotate inside the internal threaded tube 2 (20) and the internal threaded tube 1 (18), so that the internal threaded tube 2 (20) and the internal threaded tube 1 (18) run in opposite directions to push the connecting rod (23), and then adjust the angle of the protective net (24), and at the same time, the traction rope (22) pulls the fixing block 2 (21) and the fixing block 1 (17) to each other, providing a reverse traction force, so that the connection between the connecting rod (23) and the connecting column (14) is more stable.

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