Steel structure bridge sidewalk guardrail with changeable aerodynamic configuration

Abstract

The invention relates to the technical field of guardrails, in particular to a steel structure bridge sidewalk guardrail capable of changing aerodynamic configuration, which comprises cross beams, longitudinal beams, blade guardrails, rotating shafts and rotating shafts II, the two ends of the cross beams are respectively connected with one longitudinal beam, the cross beams II are connected between the two longitudinal beams, the cross beams II are arranged below the cross beams, and the blade guardrails are arranged on the cross beams. The top of the second cross beam is rotationally connected with the bottoms of a plurality of second rotating shafts, the top of each second rotating shaft is connected with the bottom of the corresponding rotating shaft through a blade guardrail, and the side walls of the rotating shafts are rotationally connected with mounting holes in the bottom of the cross beam. Therefore, the included angle between the blade guardrail and the device can be changed according to the actual wind direction, the aerodynamic shape of the bridge can be changed at any time along with the wind direction, finally, the overall stress of the device is adjusted, and the device is prevented from being structurally damaged when used in an environment with high wind speed.

Description

Technical Field

[0001] The invention relates to the technical field of guardrails, and in particular to a steel structure bridge sidewalk guardrail with a changeable aerodynamic shape. Background Art

[0002] Bridge sidewalk guardrail refers to the protective facilities installed on the edge of the bridge sidewalk, which is designed to protect the safety of pedestrians and prevent them from accidentally falling, and prevent vehicles from causing harm to pedestrians. It is an important part of the bridge structure and is usually made of metal, reinforced concrete or other durable materials.

[0003] However, the prior art still has shortcomings. For example, patent number: CN202321991195.1 is a bridge sidewalk guardrail, which includes two columns, an upper cross beam is arranged between the two columns and passes through both sides of the columns near the top, and three middle and lower cross beams are arranged between the two columns and pass through the inner sides of the columns near the middle and lower ends, wherein a number of vertical poles are fixedly installed between the two lower middle and lower cross beams, three docking pieces are fixedly welded on the outer side of the column near the middle and lower ends, and a base is fixedly welded on the outer side of the column near the bottom end, docking grooves are provided at the upper and lower ends of the docking pieces and the top surface of the base, and the same connecting rod is arranged inside the three docking grooves located on the same vertical line. The device is affected by its structure, and the overall structure is subjected to great force and is easily damaged when used in an environment with high wind speed. Summary of the invention

[0004] The present invention provides a steel structure bridge pedestrian guardrail with a changeable aerodynamic shape, which is used to solve the situation raised by the background technology.

[0005] In order to achieve the above-mentioned invention objectives, the present invention provides the following technical solutions: a steel structure bridge pedestrian guardrail with a transformable aerodynamic shape, comprising: a crossbeam, a longitudinal beam, a blade guardrail, a rotating shaft and a second rotating shaft, wherein the two ends of the crossbeam are respectively connected to a longitudinal beam, a crossbeam second is connected between the two longitudinal beams, the crossbeam second is arranged below the crossbeam, the top of the crossbeam second is rotatably connected to the bottom of multiple rotating shafts second, the top of each rotating shaft second is connected to the bottom of the rotating shaft through a blade guardrail, and the side wall of the rotating shaft is rotatably connected to the mounting hole at the bottom of the crossbeam.

[0006] Preferably, the cross-section of the blade guardrail is a rhombus, and a rounded corner is provided at the intersection of two sides of the rhombus.

[0007] Preferably, a second rounded corner is provided between the top of the blade guardrail and the rotating shaft, and a third rounded corner is provided between the bottom of the blade guardrail and the rotating shaft.

[0008] Preferably, a gear is connected to the rotating shaft, the gear is meshed with a rack, the rack is slidably connected in the crossbeam, both ends of the rack are respectively connected to the end of a spring, and the other end of the spring is connected to the pressure regulating mechanism.

[0009] Preferably, the pressure regulating mechanism includes: a storage tank, a pipeline and a pressure shell. The storage tank is connected to the crossbeam, the storage tank is filled with hydraulic oil, a plurality of circular holes are opened at the bottom of the storage tank, a rotating shaft is rotatably sealed in each circular hole, the rotating shaft is placed in the top of the storage tank and has a through hole, the through hole is connected to the storage cavity inside the blade guardrail, the two ends of the storage tank are respectively connected to the end of a pipeline, and the other end of the pipeline is connected to the pressure shell.

[0010] Preferably, the pressure regulating mechanism also includes: a second spring, a piston, a push rod, an extrusion block and an extrusion block 2. A piston is slidably sealed in the pressure shell, a pressure chamber is formed between the bottom of the piston and the inner wall of the pressure shell, the other end of the pipeline is connected to the pressure chamber, the top of the piston is connected to the inner wall of the pressure shell through the second spring, the bottom of the piston is connected to the top of the push rod, the push rod is slidably sealed with a guide hole at the bottom of the pressure shell, the push rod is placed at the bottom below the pressure shell and connected to the top of the extrusion block, a chamfer is provided at the bottom end of the extrusion block, the chamfer is arranged toward the storage tank, the chamfer is slidably matched with the second chamfer, the second chamfer is arranged at the top of the second extrusion block, the extrusion block and the second extrusion block are both slidably connected to the inner wall of the longitudinal beam, and the second extrusion block is connected to the other end of the spring.

[0011] Preferably, a reinforcement plate and a second reinforcement plate are provided in each of the longitudinal beams, and the second reinforcement plate is provided below the reinforcement plate.

[0012] Preferably, a rotating shaft three is rotatably connected to the longitudinal beam, and the end of the rotating shaft three placed in the longitudinal beam is connected to a bevel gear, the bevel gear is meshed with the bevel gear two, the bevel gear two is connected to the top of the sleeve, the sleeve is rotationally sealed with the reinforcement plate and the reinforcement plate two respectively, the bottom of the sleeve is placed under the reinforcement plate two and is slidably connected to a spline shaft, the bottom of the spline shaft is connected to the top of the screw, the screw is threadedly connected to the longitudinal beam, the bottom of the screw is connected to the top of the drill rod, and the bottom of the drill rod is arranged in the opening at the bottom of the longitudinal beam.

[0013] Preferably, a conical column is provided on the drill rod, and each side wall of the longitudinal beam is provided with a guide hole 2, the guide hole 2 is slidably connected to the insertion rod, the end of the insertion rod placed in the longitudinal beam is connected to an extrusion block 3, the chamfer 3 on the top of the extrusion block 3 is arranged toward the conical inclined surface at the bottom of the conical column, and the extrusion block 3 is connected to the longitudinal beam through a spring 3.

[0014] Preferably, a stress guiding groove is circumferentially formed on the longitudinal beam, and the stress guiding groove is arranged between the reinforcing plate and the second reinforcing plate.

[0015] The beneficial effects of the present invention are as follows:

[0016] In the scheme of the present invention:

[0017] By setting the blade guardrail device, when it is blown by the wind, the rotating shaft is rotatably connected to the bottom of the beam, and the rotating shaft is rotatably connected to the top of the second beam. Therefore, the angle between the blade guardrail and the device can be changed according to the actual wind direction, so that the aerodynamic shape of the bridge can be changed at any time with the wind direction, and finally the overall force of the device can be adjusted to prevent structural damage when the device is used in an environment with high wind speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0019] Figure 2 It is a schematic diagram of the blade guardrail structure of the present invention;

[0020] Figure 3 is a cross-sectional view of a blade guardrail of the present invention;

[0021] Figure 4 is a cross-sectional view of a storage tank of the present invention;

[0022] Figure 5 is a cross-sectional view of the pressure shell of the present invention;

[0023] Figure 6 It is a schematic diagram of the meshing connection relationship between the bevel gear and the bevel gear of the present invention;

[0024] Figure 7 It is a schematic diagram of the connection relationship between the connecting pipe and the second connecting pipe and the longitudinal beam of the present invention;

[0025] Figure 8 It is a cross-sectional view of the limiting tube of the present invention;

[0026] Fig. 9 It is a schematic diagram of the connection relationship between the longitudinal beam and the auxiliary longitudinal beam of the present invention;

[0027] Fig.10 It is a schematic diagram of the connection relationship between the mounting ring and the torsion spring of the present invention;

[0028] Fig.11 is a cross-sectional view of a gas storage tank of the present invention;

[0029] Fig.12 It is a schematic diagram of the connection relationship between the mounting tube and the airbag of the present invention;

[0030] Fig.13 It is a schematic diagram of the sliding connection relationship between the locking tube and the locking column of the present invention;

[0031] Fig.14 It is a schematic diagram of the connection relationship between the locking column, the tension spring and the mounting ring of the present invention;

[0032] Fig.15 It is a schematic diagram of the connection relationship between the pull rod and the stopper of the present invention.

[0033] Among them: cross beam 1, longitudinal beam 2, blade guardrail 3, rotating shaft 4, rotating shaft 2 5, gear 6, rack 7, spring 8, storage tank 9, pipeline 10, pressure shell 11, spring 2 12, piston 13, push rod 14, extrusion block 15, extrusion block 2 16, reinforcement plate 17, reinforcement plate 2 18, rotating shaft 3 19, bevel gear 20, bevel gear 2 21, sleeve 22, spline shaft 23, screw 24, drill rod 25, tapered column 26, plug rod 27, extrusion block 3 28, spring 3 29, stress guide groove 30, Connecting pipe 31, connecting pipe 2 32, circular groove 33, circular groove 2 34, slide groove 35, slide groove 2 36, bolt 37, bolt 2 38, limit pipe 39, auxiliary longitudinal beam 40, storage pipe 41, mounting pipe 42, mounting ring 43, torsion spring 44, sleeve 45, connecting pipe 46, air storage tank 47, air inlet hole 48, air guide cavity 49, airbag 50, locking pipe 51, locking column 52, air guide hole 53, pressure pipe 54, tension spring 55, mounting ring 2 56, pull rod 57, block 58, limit rod 59. DETAILED DESCRIPTION

[0034] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0035] Example 1: Reference Figure 1-Figure 15 A steel structure bridge pedestrian guardrail with a transformable aerodynamic shape comprises: a crossbeam 1, a longitudinal beam 2, a blade guardrail 3, a rotating shaft 4 and a rotating shaft 2 5. The two ends of the crossbeam 1 are respectively connected to a longitudinal beam 2, a crossbeam 2 is connected between the two longitudinal beams 2, the crossbeam 2 is arranged below the crossbeam 1, and the top of the crossbeam 2 is rotatably connected to the bottom of multiple rotating shafts 2 5. The top of each rotating shaft 2 5 is connected to the bottom of the rotating shaft 4 through the blade guardrail 3, and the side wall of the rotating shaft 4 is rotatably connected to the mounting hole at the bottom of the crossbeam 1.

[0036] The principles and beneficial effects of the above scheme are:

[0037] A longitudinal beam 2 is connected to each end of the crossbeam 1, and the two longitudinal beams 2 are connected by a crossbeam 2. The bottom of the longitudinal beam 2 is installed on the bridge. When the blade guardrail 3 device is blown by the wind, the rotating shaft 4 is rotatably connected to the bottom of the crossbeam 1, and the rotating shaft 2 5 is rotatably connected to the top of the crossbeam 2. Therefore, the angle between the blade guardrail 3 and the device can be changed according to the actual wind direction, so that the aerodynamic shape of the bridge can be changed at any time with the wind direction, and finally the overall force of the device can be adjusted to prevent structural damage when the device is used in an environment with high wind speed.

[0038] Example 2: Reference Figure 1-Figure 15 The cross section of the blade guardrail 3 is specifically a rhombus, and a rounded corner is provided at the intersection of two sides of the rhombus.

[0039] The principles and beneficial effects of the above scheme are:

[0040] By providing a rounded corner at the intersection of two edges, the flexibility of the structure can be increased, preventing the device from scratching pedestrians or vehicles when in use.

[0041] Example 3: Reference Figure 1-Figure 15 A second rounded corner is provided between the top of the blade guardrail 3 and the rotating shaft 4, and a third rounded corner is provided between the bottom of the blade guardrail 3 and the rotating shaft 2 5.

[0042] The principles and beneficial effects of the above scheme are:

[0043] Since rounded corner 2 is provided between the top of blade guardrail 3 and rotating shaft 4, and rounded corner 3 is provided between the bottom of blade guardrail 3 and rotating shaft 2 5, the blade guardrail 3 can prevent the operator from being scratched during installation, thereby further improving the safety of the device.

[0044] Example 4: Reference Figure 1-Figure 15 The rotating shaft 4 is connected with a gear 6, which is meshed with a rack 7, and the rack 7 is slidably connected in the crossbeam 1. The two ends of the rack 7 are respectively connected to the end of a spring 8, and the other end of the spring 8 is connected to the pressure regulating mechanism.

[0045] The principles and beneficial effects of the above scheme are:

[0046] When the blade guardrail 3 rotates, the gear 6 connected to the rotating shaft 4 is meshed with the rack 7, and the rack 7 slides in the crossbeam 1. Since the two ends of the rack 7 are each connected to the end of a spring 8, and the other end of the spring 8 is connected to the pressure regulating mechanism, when the blade guardrail 3 drives the rack 7 to move in one direction in the crossbeam 1, one spring 8 is stretched and the other spring 8 is compressed, which can prevent the blade guardrail 3 from moving excessively and being unable to reset, and at the same time provide a buffer for the movement of the blade guardrail 3. When it is blown by the wind, the aerodynamic shape of the device can be quickly changed. At the same time, when it rotates to the limit, its impact force can be prevented from causing impact on the entire device, further avoiding the device from generating noise due to vibration when in use.

[0047] Example 5: Reference Figure 1-Figure 15 The pressure regulating mechanism includes: a storage tank 9, a pipeline 10 and a pressure shell 11. The storage tank 9 is connected to the crossbeam 1, and the storage tank 9 is filled with hydraulic oil. A plurality of circular holes are opened at the bottom of the storage tank 9, and a rotating shaft 4 is rotatably sealed in each circular hole. The rotating shaft 4 is placed in the top of the storage tank 9 and has a through hole. The through hole is connected to the storage cavity inside the blade guardrail 3. The two ends of the storage tank 9 are respectively connected to the end of a pipeline 10, and the other end of the pipeline 10 is connected to the pressure shell 11.

[0048] The principles and beneficial effects of the above scheme are:

[0049] The storage chamber in the blade guardrail 3 is connected to the storage tank 9 through the through hole on the rotating shaft 4, so the storage tank 9, the through hole and the storage chamber are all filled with hydraulic oil. The filling of hydraulic oil can increase the thermal insulation effect of the blade guardrail 3 and prevent it from expanding at high temperature and shrinking at low temperature. Therefore, it can avoid its structure being deformed by temperature changes, resulting in jamming between the device and failure to work normally; after the hydraulic oil is added, the stability of the blade guardrail 3 can be increased, and on the premise of ensuring that the blade guardrail 3 can change the windward angle in time with the change of wind direction, it can be prevented from rotating frequently, reducing the friction between the rotating shaft 4 and the rotating shaft 2 5 and the crossbeam 1 and the crossbeam 2, thereby increasing the service life of the device; when the device is working at high temperature, part of the hydraulic oil enters the pressure shell 11 through the pipeline 10, thereby preventing the structural damage caused by excessive pressure inside the blade guardrail 3.

[0050] Example 6: Reference Figure 1-Figure 15 The pressure regulating mechanism also includes: a spring 12, a piston 13, a push rod 14, an extrusion block 15 and an extrusion block 16. The pressure shell 11 is slidably sealed with a piston 13. The bottom of the piston 13 and the inner wall of the pressure shell 11 form a pressure chamber. The other end of the pipeline 10 is connected to the pressure chamber. The top of the piston 13 is connected to the inner wall of the pressure shell 11 through the spring 12. The bottom of the piston 13 is connected to the top of the push rod 14. The push rod 14 is slidably sealed with the guide hole at the bottom of the pressure shell 11. The push rod 14 is placed at the bottom below the pressure shell 11 and connected to the top of the extrusion block 15. The bottom end of the extrusion block 15 is provided with a chamfer, which is arranged toward the storage tank 9. The chamfer is slidably matched with the second chamfer. The second chamfer is arranged at the top of the second extrusion block 16. The extrusion block 15 and the second extrusion block 16 are both slidably connected to the inner wall of the longitudinal beam 2. The second extrusion block 16 is connected to the other end of the spring 8.

[0051] The principles and beneficial effects of the above scheme are:

[0052] When the ambient temperature is too high, the hydraulic oil enters the pressure chamber in the pressure shell 11 through the pipeline 10, the piston 13 moves upward, the spring 2 12 contracts, the push rod 14 and the extrusion block 15 move upward, the chamfer and the chamfer 2 slide together, and the heated spring 8 causes the extrusion block 2 16 to move away from the middle of the beam 1, to prevent the elastic force of the spring 8 from being too large at high temperatures, resulting in the rack 7 not being driven by the gear 6 in time and preventing the blade guardrail 3 from rotating; when the ambient temperature is too low, the hydraulic oil in the pressure chamber enters the storage tank 9 through the pipeline 10, the piston 13 moves downward, the spring 2 12 is elongated, the push rod 14 and the extrusion block 15 move downward, the chamfer and the chamfer 2 slide together, causing the extrusion block 2 16 to move toward the middle of the beam 1, and the length of the spring 8 becomes shorter with the cooperation of the two extrusion blocks 2 16, to prevent the spring 8 from contracting excessively at low temperatures, and the extrusion block 2 16 moves between the two extrusion blocks 15, resulting in the rack 7 having no stable force point, thereby avoiding the frequent rotation of the blade guardrail 3 and improving the stability of the device.

[0053] Example 7: Reference Figure 1-Figure 15 A reinforcing plate 17 and a second reinforcing plate 18 are provided in each of the longitudinal beams 2 , and the second reinforcing plate 18 is provided below the reinforcing plate 17 .

[0054] The principles and beneficial effects of the above scheme are:

[0055] The provision of the reinforcing plate 17 and the second reinforcing plate 18 increases the structural strength of the longitudinal beam 2 .

[0056] Example 8: Reference Figure 1-Figure 15 The longitudinal beam 2 is rotatably connected with a rotating shaft 3 19, and the end of the rotating shaft 3 19 placed in the longitudinal beam 2 is connected with a bevel gear 20, which is meshed with a bevel gear 21, and the bevel gear 21 is connected to the top of a sleeve 22. The sleeve 22 is rotatably sealed with the reinforcing plate 17 and the reinforcing plate 2 18 respectively, and the sleeve 22 is placed at the bottom below the reinforcing plate 2 18 and is slidably connected with a spline shaft 23, and the bottom of the spline shaft 23 is connected to the top of a screw rod 24, and the screw rod 24 is threadedly connected to the longitudinal beam 2, and the bottom of the screw rod 24 is connected to the top of a drill rod 25, and the bottom of the drill rod 25 is arranged in an opening at the bottom of the longitudinal beam 2.

[0057] The principles and beneficial effects of the above scheme are:

[0058] When installing the device on the bridge, the bottom of the longitudinal beam 2 is inserted into the concrete mounting hole of the bridge, and downward pressure is applied to the top of the device, and then the rotating shaft 3 19 is rotated. The bevel gear 20 on the rotating shaft 3 19 drives the bevel gear 21 meshing with it to rotate, and the sleeve 22 rotates on the reinforcing plate 17 and the reinforcing plate 2 18. The sleeve 22 is located at the bottom end below the reinforcing plate 2 18 and is slidably connected with a spline shaft 23. The spline shaft 23 rotates synchronously, and the spline shaft 23 drives the screw 24 to rotate. The screw 24 is threadedly connected to the longitudinal beam 2, so the screw 24 drives the spline shaft 23 to move downward relative to the longitudinal beam 2 and rotates at the same time. The drill rod 25 connected to the bottom of the screw 24 drills the concrete mounting hole and is inserted into the drill hole, which improves the longitudinal stability and safety of the device after installation, and at the same time has a higher wind bearing capacity.

[0059] Example 9: Reference Figure 1-Figure 15 A conical column 26 is provided on the drill rod 25, and each side wall of the longitudinal beam 2 is provided with a guide hole 2, which is slidably connected to the insertion rod 27. The end of the insertion rod 27 placed in the longitudinal beam 2 is connected to an extrusion block 3 28, and the chamfer 3 at the top of the extrusion block 3 28 is arranged toward the conical inclined surface at the bottom of the conical column 26, and the extrusion block 3 28 is connected to the longitudinal beam 2 through a spring 3 29.

[0060] The principles and beneficial effects of the above scheme are:

[0061] When the drill rod 25 moves downward, it drives the tapered column 26 to move downward. After the tapered inclined surface contacts the chamfer three on the top of the extrusion block three 28, the extrusion block three 28 drives the insertion rod 27 to move along the guide hole two to the outside of the longitudinal beam 2. At the same time, the spring three 29 is compressed. After the insertion rod 27 completes its movement, its end contacts and cooperates with the inner wall of the concrete installation hole, thereby improving the lateral stability of the device after installation.

[0062] Example 10: Reference Figure 1-Figure 15 A stress guiding groove 30 is circumferentially formed on the longitudinal beam 2 , and the stress guiding groove 30 is arranged between the reinforcing plate 17 and the second reinforcing plate 18 .

[0063] The principles and beneficial effects of the above scheme are:

[0064] When the device is in use, it may encounter a collision with a vehicle. Therefore, in order to protect the safety of pedestrians on the sidewalk, a stress guiding groove 30 is circumferentially opened on each longitudinal beam 2, and the bottom of the longitudinal beam 2 can be firmly inserted into the concrete installation hole with the cooperation of the drill rod 25 and the insertion rod 27. The opening of the stress guiding groove 30 can absorb and buffer the stress after the collision, and at the same time guide the deformation caused by the stress, so that the upper part of the longitudinal beam 2 bends toward its lower part, thereby avoiding the longitudinal beam 2 from causing collision to pedestrians.

[0065] Example 11: Reference Figure 1-Figure 15 The stress guiding groove 30 is provided with a connecting pipe 31 and a second connecting pipe 32 on both sides, the connecting pipe 31 is arranged above the second connecting pipe 32, and the connecting pipe 31 and the second connecting pipe 32 are both connected to the longitudinal beam 2. A plurality of circular grooves 33 are longitudinally opened on the side wall of the connecting pipe 31, and the diameter of the circular grooves 33 gradually decreases from top to bottom. A plurality of second circular grooves 34 are longitudinally opened on the side wall of the second connecting pipe 32, and the diameter of the second circular grooves 34 gradually decreases from bottom to top. Two adjacent circular grooves 33 in the longitudinal direction are connected by a slide groove 35, and two adjacent circular grooves 34 in the longitudinal direction are connected by a slide groove 36. The nut of the bolt 37 is inserted into the circular groove 33 with the largest diameter, and the nut of the bolt 2 38 is inserted into the circular groove 34 with the largest diameter. The threaded portion of the bolt 37 and the threaded portion of the bolt 2 38 are both threadedly connected to the limiting tube 39, and the inner wall of the limiting tube 39 contacts and cooperates with the side walls of the connecting tube 31 and the connecting tube 2 32. A nut is threadedly connected to the threaded portion of the bolt 37, and the nut contacts and cooperates with the side wall of the limiting tube 39 through an anti-loosening gasket. A nut 2 is threadedly connected to the threaded portion of the bolt 2 38, and the nut 2 contacts and cooperates with the side wall of the limiting tube 39 through an anti-loosening gasket.

[0066] The principles and beneficial effects of the above scheme are:

[0067] The limiting tube 39 is plugged into and matched with the circular groove 33 with the largest diameter through the nut of the bolt 37, and the nut of the second bolt 38 is plugged into and matched with the circular groove 34 with the largest diameter. The bolt 37 and the second bolt 38 are both threadedly connected with the limiting tube 39. The threaded portion of the bolt 37 is threadedly connected with a nut, and the nut contacts and matches with the side wall of the limiting tube 39 through a locking washer. The threaded portion of the second bolt 38 is threadedly connected with a nut 2, and the nut 2 contacts and matches with the side wall of the limiting tube 39 through a locking washer 2, so the limiting tube 39 can be firmly installed on the connecting tube 31 and the connecting tube 2. 32, when the impact force on the device is too large, or the blade guardrail 3 is hit and the two longitudinal beams 2 are bent toward each other, the stress guiding groove 30 is broken, and the connecting pipe 31 and the connecting pipe 2 32 move in opposite directions. At this time, the nut of the bolt 37 moves downward from the circular groove 33 with the largest diameter, and moves to the remaining circular grooves 33 through the guidance of the slide groove 35. The nut of the bolt 2 38 moves upward from the circular groove 2 34 with the largest diameter, and moves to the remaining circular grooves 2 34 through the guidance of the slide groove 2 36. At this time, the diameter of the bottom of the connecting pipe 31 is The diameter of the top of the connecting pipe 32 becomes larger, and the inner wall of the limiting pipe 39 is squeezed, so the longitudinal beam 2 after the stress guiding groove 30 is torn can still be connected together through the limiting pipe 39, preventing the splashing of the parts of the device from threatening the safety of pedestrians; at the same time, the two nuts are respectively guided by the slide groove 35 and the slide groove 36, and the stress of the device is continuously dissipated in the process of moving to the remaining circular grooves 33 and the circular groove 34, which effectively buffers and absorbs the impact of the vehicle, and can also ensure that the remaining parts in the device will not Damage occurs due to excessive stress; after the limiting tube 39 is installed on the connecting tube 31 and the connecting tube 2 32, the nut contacts and cooperates with the side wall of the limiting tube 39 through the anti-loosening gasket, and the nut 2 contacts and cooperates with the side wall of the limiting tube 39 through the anti-loosening gasket 2. Therefore, when the device is affected by wind force, the limiting tube 39 will not be loosened due to the vibration generated by the device. Further, it can be ensured that the device can effectively absorb the impact after being subjected to a large impact force. The existing components are fully utilized in the mechanism, which greatly reduces the difficulty and cost of manufacturing the device.

[0068] Example 12: Reference Figure 1-Figure 15, each of the longitudinal beams 2 is installed with an auxiliary longitudinal beam 40 on the side, a storage tube 41 is connected between the two auxiliary longitudinal beams 40, a mounting tube 42 is arranged in the storage tube 41, the end of the mounting tube 42 is rotatably connected to the inner wall of the auxiliary longitudinal beam 40, two mounting rings 43 are arranged on the mounting tube 42, each mounting ring 43 is connected to the inner wall of the auxiliary longitudinal beam 40 through a torsion spring 44, and there are two sleeves 45 on the mounting tube 42 for rotational sealing, and the inner wall of each sleeve 45 is connected to the air storage tank 47 through a connecting tube 46, and a locking mechanism is connected to the connecting tube 46, and the locking mechanism is connected to the mounting The ring 43 is in contact and fit, and the air tank 47 is filled with compressed air. The air tank 47 is installed on the inner wall of the auxiliary longitudinal beam 40. The side walls at both ends of the mounting tube 42 are opened with multiple air inlet holes 48 in the circumferential direction. The air inlet holes 48 are connected to the connecting tube 46, and the other end of the air inlet holes 48 is connected to the air guide cavity 49 in the mounting tube 42. The open end of the airbag 50 is connected to the air guide cavity 49. The airbag 50 is wrapped around the mounting tube 42, and the airbag 50 slides with the groove on the side wall of the storage tube 41. The other end of the airbag 50 is bonded to the side wall of the storage tube 41 away from the longitudinal beam 2.

[0069] The principles and beneficial effects of the above scheme are:

[0070] When the device is hit, the locking mechanism unlocks the mounting ring 43 due to the breakage of the stress guiding groove 30, and the mounting tube 42 is driven to twist when the torsion spring 44 is twisted. At the same time, since a plurality of air inlet holes 48 are provided on the mounting tube 42 to communicate with the air guide cavity 49, and the mounting tube 42 is rotationally sealed with the sleeve 45, the connecting tube 46 connected to the bottom of the sleeve 45 can supply the compressed air stored in the air tank 47 to the air guide cavity 49 through the air inlet holes 48, and finally enter the airbag 50. The rotating mounting tube 42 drives the airbag 50 to rotate and moves the other end thereof away from the side wall of the longitudinal beam 2. While the compressed air is filled in the airbag 50, the airbag 50 begins to expand and ends the bonding with the storage tube 41. Finally, after the expansion is completed, the airbag 50 contacts the passing pedestrians to protect the pedestrians and prevent them from being hit by the device.

[0071] Example 13: Reference Figure 1-Figure 15The locking mechanism includes: a locking tube 51, a locking tube 51 is connected to the connecting tube 46, a locking column 52 is slidably connected in the locking tube 51, an air guide hole 53 is penetrated on the locking column 52, the axis of the air guide hole 53 is staggered with the axis of the connecting tube 46, and is arranged away from the auxiliary longitudinal beam 40, one end of a pressure tube 54 is connected to the end of the locking tube 51, the two pressure tubes 54 are connected by an auxiliary pressure tube, the other end of the pressure tube 54 is placed in a compressed air storage chamber composed of a reinforcement plate 17, a second reinforcement plate 18 and a longitudinal beam 2, and the compressed air storage chamber is filled with compressed air, the end of the locking column 52 is connected to the second mounting ring 56 through a tension spring 55, and the second mounting ring 56 is connected to the inner wall of the locking tube 51, the other end of the locking column 52 outside the locking tube 51 is connected to a pull rod 57, the bottom of the mounting ring 43 is connected to a limiting rod 59, and the stopper 58 on the pull rod 57 is in contact with the bottom of the limiting rod 59.

[0072] The principles and beneficial effects of the above scheme are:

[0073] When the device is not hit, the compressed air stored in the compressed air storage chamber can lock the locking device, so that the airbag 50 will not be triggered when it is not hit. When the device is hit, the stress guiding groove 30 breaks, which reduces the air pressure in the compressed air storage chamber, reduces the pressure applied by the pressure tube 54 on the locking column 52, and the tension spring 55 contracts. The locking column 52 slides in the locking tube 51 toward the longitudinal beam 2, and then the air guide hole 53 is connected to the connecting tube 46, so as to inflate the airbag 50. When the air guide hole 53 is connected to the connecting tube 46, the pull rod 57 drives the stopper 58 to the longitudinal beam 2. The stopper 58 stops restricting the limit rod 59 installed at the bottom of the mounting ring 43, and the mounting tube 42 rotates under the elastic force of the torsion spring 44, thereby releasing the airbag 50. When the device is not in use, the mounting tube 42 can be locked by the compressed air stored in the compressed air storage chamber. Therefore, when the stress guiding groove 30 is not damaged or torn, or when the device is moved or installed, the vibration will not cause the release of the airbag 50, which has extremely strong stability. Since the two pressure tubes 54 are connected by an auxiliary pressure tube, as long as one stress guiding groove 30 is damaged or torn, the airbag 50 can be released. After the rupture, the reduction of the pressure in the compressed air storage chamber can make the two locking columns 52 move quickly under the guidance of the tension spring 55, and the two mounting rings 43 are unlocked at the same time. Under the elastic force of the torsion spring 44, the airbag 50 is quickly released, and the airbag 50 is filled with enough compressed air to expand it to a large enough size to protect the pedestrians passing by, so as to avoid the phenomenon that the device cannot be started after an emergency occurs or cannot effectively protect the pedestrians after starting. At this time, the compressed air stored in the compressed air storage chamber can also be filled to the space between the limit tube 39 and the connecting tube 31 and the connecting tube 2 32. When a large gap is generated between the limit tube 39 and the connecting tube 31 and the connecting tube 2 32 and they are connected to the outside world, the flowing compressed air can limit the moving speed of the broken longitudinal beam 2 by utilizing the friction generated by the flow of compressed air between the limit tube 39 and the connecting tube 31 and the connecting tube 2 32; when the gap between the limit tube 39 and the connecting tube 31 and the connecting tube 2 32 is small, the air pressure of the expanded compressed air is utilized to apply pressure to the middle part of the limit tube 39, and at the same time, the inner diameters at both ends are reduced, thereby preventing the longitudinal beam 2 from breaking; the opening of the locking mechanism is controlled by air pressure, which greatly improves the practicability and reaction speed of the device.

[0074] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A steel structure bridge sidewalk guardrail with a changeable aerodynamic shape, characterized in that: include: A crossbeam (1), wherein both ends of the crossbeam (1) are respectively connected to a longitudinal beam (2), a second crossbeam is connected between the two longitudinal beams (2), the second crossbeam is arranged below the crossbeam (1), the top of the second crossbeam is rotatably connected to the bottom of a plurality of second rotating shafts (5), the top of each second rotating shaft (5) is connected to the bottom of a rotating shaft (4) through a blade guardrail (3), and the side wall of the rotating shaft (4) is rotatably connected to the mounting hole at the bottom of the crossbeam (1).

2. The steel structure bridge pedestrian guardrail with a changeable aerodynamic shape according to claim 1 is characterized in that: The cross section of the blade guardrail (3) is specifically a rhombus, and a rounded corner is provided at the intersection of two sides of the rhombus.

3. The steel structure bridge pedestrian guardrail with a changeable aerodynamic shape according to claim 2 is characterized in that: A second rounded corner is provided between the top of the blade guardrail (3) and the rotating shaft (4), and a third rounded corner is provided between the bottom of the blade guardrail (3) and the second rotating shaft (5).

4. The steel structure bridge pedestrian guardrail with a changeable aerodynamic shape according to claim 3 is characterized in that: The rotating shaft (4) is connected with a gear (6), the gear (6) is meshed with a rack (7), the rack (7) is slidably connected in the crossbeam (1), the two ends of the rack (7) are respectively connected to the end of a spring (8), and the other end of the spring (8) is connected to the pressure regulating mechanism.

5. The steel structure bridge pedestrian guardrail with a changeable aerodynamic shape according to claim 4 is characterized in that: The pressure regulating mechanism comprises: a storage tank (9), the storage tank (9) is connected to the cross beam (1), the storage tank (9) is filled with hydraulic oil, a plurality of circular holes are opened at the bottom of the storage tank (9), a rotating shaft (4) is rotatably sealed in each circular hole, the rotating shaft (4) is placed in the storage tank (9) and has a through hole at the top, the through hole is connected to the storage cavity inside the blade guardrail (3), the two ends of the storage tank (9) are respectively connected to the end of a pipe (10), and the other end of the pipe (10) is connected to the pressure shell (11).

6. The steel structure bridge pedestrian guardrail with a changeable aerodynamic shape according to claim 5 is characterized in that: The pressure regulating mechanism further comprises: a piston (13), wherein the pressure shell (11) is slidably sealed with the piston (13), wherein the bottom of the piston (13) and the inner wall of the pressure shell (11) form a pressure chamber, wherein the other end of the pipe (10) is connected to the pressure chamber, wherein the top of the piston (13) is connected to the inner wall of the pressure shell (11) via a second spring (12), wherein the bottom of the piston (13) is connected to the top of a push rod (14), wherein the push rod (14) is slidably sealed with a guide hole at the bottom of the pressure shell (11), wherein the bottom of the push rod (14) disposed below the pressure shell (11) is connected to the top of an extrusion block (15), wherein a chamfer is provided at the bottom end of the extrusion block (15), wherein the chamfer is arranged toward the storage tank (9), wherein the chamfer is slidably matched with a second chamfer, wherein the second chamfer is arranged at the top of a second extrusion block (16), wherein both the extrusion block (15) and the second extrusion block (16) are slidably connected to the inner wall of the longitudinal beam (2), and the second extrusion block (16) is connected to the other end of the spring (8).

7. The steel structure bridge pedestrian guardrail with a changeable aerodynamic shape according to claim 6 is characterized in that: A reinforcing plate (17) and a second reinforcing plate (18) are arranged in each of the longitudinal beams (2), and the second reinforcing plate (18) is arranged below the reinforcing plate (17).

8. The steel structure bridge pedestrian guardrail with a changeable aerodynamic shape according to claim 7 is characterized in that: The longitudinal beam (2) is rotatably connected with a rotating shaft three (19), the end of the rotating shaft three (19) placed in the longitudinal beam (2) is connected with a bevel gear (20), the bevel gear (20) is meshedly connected with the bevel gear two (21), the bevel gear two (21) is connected with the top of a sleeve (22), the sleeve (22) is rotatably sealed with the reinforcing plate (17) and the reinforcing plate two (18), the sleeve (22) is placed under the reinforcing plate two (18) and is slidably connected with a spline shaft (23), the bottom of the spline shaft (23) is connected with the top of a screw rod (24), the screw rod (24) is threadedly connected with the longitudinal beam (2), the bottom of the screw rod (24) is connected with the top of a drill rod (25), and the bottom of the drill rod (25) is arranged in an opening at the bottom of the longitudinal beam (2).

9. The steel structure bridge pedestrian guardrail with a changeable aerodynamic shape according to claim 8, characterized in that: The drill rod (25) is provided with a conical column (26), and each side wall of the longitudinal beam (2) is provided with a guide hole (2), the guide hole (2) is slidably connected to the insertion rod (27), the end of the insertion rod (27) placed in the longitudinal beam (2) is connected to an extrusion block (28), the chamfer (3) at the top of the extrusion block (28) is arranged toward the conical inclined surface at the bottom of the conical column (26), and the extrusion block (28) is connected to the longitudinal beam (2) through a spring (29).

10. The steel structure bridge pedestrian guardrail with a changeable aerodynamic shape according to claim 9, characterized in that: A stress guiding groove (30) is provided in an annular direction on the longitudinal beam (2), and the stress guiding groove (30) is arranged between the reinforcing plate (17) and the second reinforcing plate (18).

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