Height-adjustable equal-span truss type bridge

Abstract

The invention relates to a height-adjustable equal-span truss type bridge which is characterized by comprising a first-stage bridge, a second-stage bridge, a bridge lifting system and bridge connecting units which are built on a shore base and a wharf boat and have height difference. One end of the first-level bridge and one end of the second-level bridge are rotationally connected with the first bridge connecting unit and the second bridge connecting unit correspondingly, and the other end of the first-level bridge and the other end of the second-level bridge are rotationally connected with the bridge lifting system at the same time. The first-level bridge and the second-level bridge are lifted through the bridge lifting system, and under the synergistic effect of the first bridge connecting unit and the second bridge connecting unit, the first-level bridge and the second-level bridge are located above the water surface. The device is suitable for a large-fall environment scene, and is simple in structure, low in manufacturing cost, adjustable in height, convenient to operate, economical and safe, frequent disassembly and assembly are avoided, and the construction difficulty and the work amount are reduced.

Description

Technical Field

[0001] The present invention relates to a truss bridge, and more particularly to an equal-span truss bridge suitable for a height difference and adjustable in height. Background Art

[0002] In order to improve the intercommunication efficiency between a dock barge and a shore base, a bridge needs to be erected between the barge and the shore base to establish a connection. Common bridge erection methods mainly include suspension bridges, floating bridges, or steel truss bridges used in combination with ladders.

[0003] Since the water level changes with the seasons, the water level will rise or fall, so there is a certain height difference between the shore base and the water surface. If a suspension bridge is erected, the end of the suspension bridge needs to be embedded with the barge, which has certain requirements for the span and drop. When the span is too large, the bridge deck will sink into the water. Therefore, it is not suitable to erect a suspension bridge for large spans and large drops. If a floating bridge is erected, then floating barrels or boats are used as piers between the barge and the shore base to lay the bridge. The floating barrels or boats can be disassembled and assembled according to the water level, so as to adjust the bridge length. However, the disadvantages of laying a floating bridge are also extremely obvious, that is, the disassembly and assembly process is relatively cumbersome, the adaptability is poor, and there are certain safety hazards. If a steel truss bridge is erected, piers need to be built near the barge gunwale, which not only involves underwater construction, but also requires the installation of ladders, with a high cost and safety hazards. At the same time, if a single-span steel structure bridge is used, on the premise of ensuring the safety of the bridge, the bridge body is relatively large, the weight and construction cost are both high, and because one end of the bridge body is on the barge, it will also pose a safety hazard to the stability of the barge.

[0004] Therefore, in order to solve the problem of large spans between the barge and the shore base, and at the same time consider the actual situation that the bridge can adapt to large drops, it is necessary to design an equal-span truss bridge that can change with the water level and adjust the height according to the drop requirement. At the same time, it is also necessary to take into account the characteristics of convenient operation, low construction cost, and very convenient use. Summary of the Invention

[0005] The object of the present invention is to provide a height-adjustable equal-span truss bridge suitable for large-drop environmental scenarios, which is not only simple in structure and low in construction cost, but also adjustable in height, convenient to operate, avoids frequent disassembly and assembly, reduces the construction difficulty and workload, and is economical and safe.

[0006] In order to achieve the above object, the technical solution of the present invention is: a height-adjustable equal-span truss bridge, the innovation of which lies in: including a first-level bridge, a second-level bridge, and a bridge lifting system, as well as a first bridge connection unit built on the shore base and a second bridge connection unit provided on the barge.

[0007] There is a height difference between the first bridge connection unit and the second bridge connection unit, and the bridge lifting system is arranged between the first bridge connection unit and the second bridge connection unit.

[0008] One end of the primary bridge and one end of the secondary bridge are respectively rotatably connected to the first bridge connection unit and the second bridge connection unit, and the other ends of the primary bridge and the secondary bridge are simultaneously rotatably connected to the bridge lifting system.

[0009] As the water level changes, the primary bridge and the secondary bridge are lifted and lowered by the bridge lifting system, and under the coordinated action of the first bridge connection unit and the second bridge connection unit, the primary bridge and the secondary bridge are located above the water surface.

[0010] In the above technical solution, the bridge lifting system includes a lifting tower, a bridge lifting unit, and a bridge lifting transmission unit.

[0011] The lifting tower is arranged between the first bridge connection unit and the second bridge connection unit. Multiple groups of spaced-apart limit brackets are arranged on the lifting tower along its height direction, and the lifting tower has a lifting passage.

[0012] The bridge lifting unit includes a lifting frame rotatably connected to the ends of the primary bridge and the secondary bridge, and the lifting frame is located in the lifting passage of the lifting tower.

[0013] The bridge lifting transmission unit includes an electric winch, a towing rope, a first pulley block, and a second pulley block. The electric winch and the first pulley block are both arranged at the top of the lifting tower, the second pulley block is arranged at the top of the lifting frame, one end of the towing rope is fixedly connected to the winding disc of the electric winch, the other end is connected to the second pulley block, and at the same time, the towing rope is also in transmission connection with the first pulley block.

[0014] Drive the electric winch to act, let it drive the towing rope to wind or unwind, and simultaneously drive the lifting frame to rise or fall in the lifting passage, so that the lifting frame is supported on the limit brackets at the corresponding height, and the synchronous lifting and lowering of the primary bridge and the secondary bridge are completed.

[0015] In the above technical solution, the lifting frame includes a backbone, a connection platform, and a plurality of lifting columns. The tops and bottoms of the plurality of lifting columns are respectively fixedly connected to the backbone and the connection platform, and the second pulley block is arranged on the backbone.

[0016] The primary bridge and the secondary bridge are simultaneously rotatably connected to the connection platform.

[0017] A support cross beam for supporting the entire lifting frame on the limit brackets is further arranged on the connection platform, and the support cross beam is in sliding fit with the connection platform.

[0018] In the above technical solution, the lifting frame further includes a reinforcing beam for enhancing the overall strength, and both ends of the reinforcing beam are fixedly connected to the corresponding lifting columns respectively.

[0019] In the above technical solution, the lifting frame has a connection platform, on which a transmission mechanism and a support cross beam are provided. The support cross beam is slidably matched with the chute of the connection platform, and the transmission mechanism is in transmission connection with the support cross beam. By driving the transmission mechanism to act, the support cross beam slides along the chute of the connection platform to the extreme position under the action of the transmission mechanism and is located inside the limit bracket, so as to avoid interference between the lifting frame and the limit bracket during the lifting process.

[0020] In the above technical solution, the transmission mechanism is a motor or a cylinder. When the transmission mechanism is a motor, the transmission shaft of the motor is in transmission connection with the support cross beam through a linear guide rail. When the transmission mechanism is a cylinder, the ejector rod of the cylinder is connected to the support cross beam.

[0021] In the above technical solution, the lifting tower includes a tower platform and four tower columns fixedly connected to the ground foundation. The tower platform is fixedly connected to the four tower columns at the same time. The electric winch and the first pulley block are both arranged on the tower platform of the lifting tower. The four tower columns enclose a lifting channel for lifting the lifting frame. At the same time, a plurality of separately arranged limit brackets are provided on the inner side wall of each tower column along the height direction, and the four limit brackets at the same height are in the same plane.

[0022] In the above technical solution, bridge hinge bearings are respectively provided on the first-level bridge and the second-level bridge, and a plurality of lifting hinge bearings are provided on the lifting frame. The bridge hinge bearings of the first-level bridge and the second-level bridge are rotatably connected to the corresponding lifting hinge bearings on the lifting frame through hinges.

[0023] In the above technical solution, the first bridge connection unit includes a guide rail frame provided on the shore base, and a first limit pile is provided at the free end of the guide rail frame. One end of the first-level bridge is provided with a first roller rotatably connected thereto. The first roller is in rolling cooperation with the guide rail frame and is located inside the first limit pile.

[0024] The second bridge connection unit includes a metal backing plate provided on the floating dock, and second limit piles arranged at intervals on the metal backing plate. One end of the second-level bridge is provided with a second roller rotatably connected thereto. The second roller is arranged between the two second limit piles and is in rolling cooperation with the metal backing plate.

[0025] The inner side of the floating dock is also provided with a floating dock limit column fixedly connected thereto.

[0026] In the above technical solution, brackets and trough boxes and / or pedestrian step units for laying pipelines are provided on the bridge bodies of the primary bridge and the secondary bridge.

[0027] The pedestrian step unit includes step rib plates, a pedal angle adjustment module, and an adjustment connecting plate. The adjustment connecting plate is assembled and connected to the bridge body through the pedal angle adjustment module, and the pedal angle adjustment module is located on one side of the adjustment connecting plate. The step rib plates are rotatably connected to the adjustment connecting plate through adjustment connecting plate pins, and both sides of the pedal rib plates are rotatably supported on the bridge body through pedal fixing pins. At the same time, a pedal is provided on the top of the step rib plates.

[0028] The pedal angle adjustment module includes a connecting plate, an adjustment positioning plate, an adjustment stud, a locking nut, and an adjustment handle. A connecting plate is provided at the end of the adjustment connecting plate, and one end of the adjustment stud is fixedly connected to the connecting plate. The adjustment stud passes through the screw hole of the adjustment positioning plate provided on the bridge body, and the adjustment stud and the adjustment positioning plate are fixed into one body through the locking nuts on both sides of the adjustment positioning plate. The adjustment handle is fixedly connected to the locking nut provided outside the adjustment positioning plate.

[0029] Loosen the locking nut inside the adjustment positioning plate, rotate the adjustment handle, and translate the adjustment connecting plate to make the step rib plates rotate around the adjustment connecting plate pins to achieve the angle adjustment of the step rib plates.

[0030] The positive effects of the present invention are as follows: After adopting the height-adjustable equal-span truss bridge of the present invention, since the present invention includes a primary bridge, a secondary bridge, and a bridge lifting system, as well as a first bridge connection unit established on the shore base and a second bridge connection unit provided on the pontoon.

[0031] There is a height difference between the first bridge connection unit and the second bridge connection unit, and the bridge lifting system is provided between the first bridge connection unit and the second bridge connection unit.

[0032] One end of the primary bridge and one end of the secondary bridge are respectively rotatably connected to the first bridge connection unit and the second bridge connection unit, and the other end of the primary bridge and the other end of the secondary bridge are simultaneously rotatably connected to the bridge lifting system.

[0033] During use, with the change of the water level, the primary bridge and the secondary bridge are lifted and lowered through the bridge lifting system, and under the coordinated action of the first bridge connection unit and the second bridge connection unit, the primary bridge and the secondary bridge are located above the water surface, which not only solves the problem of large-span between the shore base and the pontoon, but also can be applicable to the actual use environment scenario with large drop, overcomes the drawbacks generated by building a suspension bridge, a floating bridge or using a steel structure truss bridge with a ladder, has a lower construction cost compared with a single-span steel structure bridge, and is also very convenient to operate.

[0034] The present invention can effectively ensure the use safety, avoid a series of cumbersome processes such as frequent disassembly, assembly, and climbing, thereby improving the use safety. By borrowing a pontoon as a fulcrum, the construction difficulty and the amount of work are reduced, making the structure more economical.

[0035] In summary, the present invention is applicable to large-drop environment scenarios. It not only has a simple structure and low construction cost, but also is height-adjustable, convenient to operate, avoids frequent disassembly and assembly, reduces the construction difficulty and the amount of work, and is economical and safe. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 is a schematic structural diagram of a specific embodiment of the present invention;

[0037] Figure 2 is a schematic structural diagram of the bridge lifting system of the present invention;

[0038] Figure 3 is a schematic structural diagram of the pedestrian step unit of the present invention;

[0039] Figure 4 is Figure 3 a partial enlarged schematic diagram of DETAILED DESCRIPTION OF THE EMBODIMENTS

[0040] The present invention will be further described below in conjunction with the accompanying drawings and the given embodiments, but it is not limited thereto.

[0041] As Figure 1 、 2 、3, and 4 show, a height-adjustable equal-span truss bridge includes a primary bridge 1, a secondary bridge 2, and a bridge lifting system 3, as well as a first bridge connection unit 4 built on the shore base and a second bridge connection unit 5 provided on the pontoon.

[0042] There is a height difference between the first bridge connection unit 4 and the second bridge connection unit 5, and the bridge lifting system 3 is provided between the first bridge connection unit 4 and the second bridge connection unit 5.

[0043] One end of the primary bridge 1 and one end of the secondary bridge 2 are respectively rotatably connected to the first bridge connection unit 4 and the second bridge connection unit 5, and the other end of the primary bridge 1 and the other end of the secondary bridge 2 are simultaneously rotatably connected to the bridge lifting system 3.

[0044] As the water level changes, the primary bridge 1 and the secondary bridge 2 are lifted and lowered by the bridge lifting system 3, and under the coordinated action of the first bridge connection unit 4 and the second bridge connection unit 5, the primary bridge 1 and the secondary bridge 2 are located above the water surface.

[0045] Further, as Figure 2As shown in the figure, in order to ensure the stable lifting of the bridge, the bridge lifting system 3 includes a lifting tower 31, a bridge lifting unit 32 and a bridge lifting transmission unit 33.

[0046] The lifting tower 31 is arranged between the first bridge connection unit 4 and the second bridge connection unit 5. Along the height direction of the lifting tower 31, a plurality of separately arranged limit brackets 310 are provided, and the lifting tower 31 has a lifting passage.

[0047] The bridge lifting unit 32 includes a lifting frame 321 rotatably connected to the ends of the first-level bridge 1 and the second-level bridge 2, and the lifting frame 321 is located in the lifting passage of the lifting tower 31.

[0048] The bridge lifting transmission unit 33 includes an electric winch 331, a traction rope 332, a first pulley group 333 and a second pulley group 334. The electric winch 331 and the first pulley group 333 are both arranged at the top of the lifting tower 31, and the second pulley group 334 is arranged at the top of the lifting frame 321. One end of the traction rope 332 is fixedly connected to the winding disc of the electric winch 331, and the other end is connected to the second pulley group 334. At the same time, the traction rope 332 is also in transmission connection with the first pulley group 333.

[0049] Drive the electric winch 331 to act, let it drive the traction rope 332 to wind or unwind, and synchronously drive the lifting frame 321 to rise or fall in the lifting passage, so that the lifting frame 321 is supported on the limit brackets 310 at the corresponding height, and the synchronous lifting of the first-level bridge 1 and the second-level bridge 2 is completed.

[0050] Further, as Figure 2 shown, in order to ensure the stability and smoothness of the lifting frame during the process of lifting the bridge end, the lifting frame 321 includes a backbone 3211, a connection platform 3212 and a plurality of lifting columns 3213. The tops and bottoms of the plurality of lifting columns 3213 are fixedly connected to the backbone 3211 and the connection platform 3212 respectively. The second pulley group 334 is arranged on the backbone 3211. The first-level bridge 1 and the second-level bridge 2 are simultaneously rotatably connected to the connection platform 3212. A support cross beam 35 for supporting the whole lifting frame 321 on the limit brackets 310 is also arranged on the connection platform 3212, and the support cross beam 35 is in sliding fit with the connection platform 3212. When adjusting the position of the lifting frame, the support cross beam 35 can be manually moved inward to avoid interference with the limit brackets.

[0051] Further, as Figure 2 shown, in order to further improve the overall rigidity strength of the lifting frame, the lifting frame 321 further includes a reinforcing beam 3214 for strengthening the overall strength. The two ends of the reinforcing beam 3214 are respectively fixedly connected to the corresponding lifting columns 3213.

[0052] Furthermore, as Figure 2 shown, in order to prevent interference or collision between the bottom of the lifting frame and the limit bracket, affect the reliability of lifting, and achieve automatic control to make the operation more convenient and labor-saving, the lifting frame 321 is provided with an interface platform 3212. A transmission mechanism 34 and a support crossbeam 35 are arranged on the interface platform 3212. The support crossbeam 35 is slidably matched with the chute of the interface platform 3212, and the transmission mechanism 34 is in transmission connection with the support crossbeam 35. When the position of the lifting frame 321 needs to be adjusted, first use the bridge lifting transmission unit 33 to lift the lifting frame 321 by a small stroke, so that the support crossbeam 35 at the bottom of the lifting frame 321 is separated from the support surface of the limit bracket 310, and then drive the transmission mechanism 34 to act, so that the support crossbeam 35 slides along the chute of the interface platform 3212 to the extreme position under the action of the transmission mechanism 34 and is located inside the limit bracket 310, avoiding interference between the lifting frame 321 and the limit bracket 310 during the lifting process.

[0053] Furthermore, in order to facilitate driving the support crossbeam to shift on the lifting frame 321, the transmission mechanism 34 is a motor or a cylinder. When the transmission mechanism 34 is a motor, the transmission shaft of the motor is in transmission connection with the support crossbeam 35 through a linear guide rail. When the transmission mechanism 34 is a cylinder, the ejector rod of the cylinder is connected to the support crossbeam 35.

[0054] Furthermore, as Figure 2 shown, in order to further improve the rationality of the structure and ensure that the entire lifting frame is stably supported on the limit bracket and is in the same plane without height differences, the lifting tower 31 includes a tower platform 311 and four tower columns 312 fixedly connected to the ground foundation. The tower platform 311 is fixedly connected to the four tower columns 312 at the same time. The electric winch 331 and the first pulley block 333 are both arranged on the tower platform 311 of the lifting tower 31. The four tower columns 312 enclose a lifting channel for lifting the lifting frame 321. At the same time, a plurality of separately arranged limit brackets 310 are provided on the inner side wall of each tower column 312 along the height direction, and the four limit brackets 310 at the same height are in the same plane.

[0055] Furthermore, as Figure 1 shown, in order to enable the bridge to rotate during the lifting process and not easily get stuck or jammed, bridge hinge supports 6 are respectively arranged on the first-level bridge 1 and the second-level bridge 2. A plurality of lifting hinge supports 3215 are arranged on the lifting frame 321. The bridge hinge supports 6 of the first-level bridge 1 and the second-level bridge 2 are respectively rotationally connected to the corresponding lifting hinge supports 3215 on the lifting frame 321 through hinges.

[0056] Further, as Figure 1 shown, in order to ensure that the bridge can roll freely on the shore base and the pontoon during the lifting process and achieve adaptive adjustment, the first bridge connection unit 4 includes a guide rail frame 41 provided on the shore base, and a first limit pile 42 is provided at the free end of the guide rail frame 41. One end of the primary bridge 1 is provided with a first roller 11 rotatably connected thereto. The first roller 11 is in rolling cooperation with the guide rail frame 41 and is located inside the first limit pile 42.

[0057] The second bridge connection unit 5 includes a metal backing plate 51 provided on the pontoon, and second limit piles 52 arranged at intervals on the metal backing plate 51. One end of the secondary bridge 2 is provided with a second roller 21 rotatably connected thereto. The second roller 21 is arranged between the two second limit piles 52 and is in rolling cooperation with the metal backing plate 51.

[0058] In order to limit the pontoon and prevent the pontoon from drifting in the water, a pontoon limit post 7 fixedly connected thereto is further provided inside the pontoon.

[0059] The truss bridge of the present invention can be provided with pedestrian steps, pipelines, and cables, or take them into account simultaneously. The length is equivalent to the length of the bridge deck. When laying pipelines or cables, they are fixed in the brackets and trough boxes on one side of the bridge main body 9. The pipeline joints are connected by hoses with appropriate lengths. The cables are reserved with a certain length at the joints to adapt to the change in the degree of freedom during the adjustment of the bridge, overcoming the situation in the prior art where frequent disassembly and assembly are required once the water level changes, and avoiding inconvenience in use.

[0060] Of course, as Figure 3 、 4 shown, the present invention provides a pedestrian step unit 8 on the bridge main body 9 for people to walk. The pedestrian step unit 8 includes a step rib plate 81, a pedal angle adjustment module 82, and an adjustment connecting plate 83. The adjustment connecting plate 83 is assembled and connected to the bridge main body 9 through the pedal angle adjustment module 82, and the pedal angle adjustment module 82 is located on one side of the adjustment connecting plate 83. The step rib plate 81 is rotatably connected to the adjustment connecting plate 83 through an adjustment connecting plate pin 84, and both sides of the pedal rib plate 81 are rotatably supported on the bridge main body 9 through pedal fixing pins 85. At the same time, a pedal 86 is further provided on the top of the step rib plate 81.

[0061] The pedal angle adjustment module 82 includes a connecting plate 821, an adjustment positioning plate 822, an adjustment stud 823, a locking nut 824 and an adjustment handle 825. The end of the adjustment connecting plate 83 is provided with a connecting plate 821, and one end of the adjustment stud 823 is fixedly connected to the connecting plate 821. The adjustment stud 823 passes through the screw hole of the adjustment positioning plate 822 provided on the bridge body 9, and the adjustment stud 823 and the adjustment positioning plate 822 are fastened together by the locking nuts 824 on both sides of the adjustment positioning plate 822. The adjustment handle 825 is fixedly connected to the locking nut 824 provided on the outer side of the adjustment positioning plate 822.

[0062] Loosen the locking nut 824 on the inner side of the adjustment positioning plate 822, rotate the adjustment handle 825, translate the adjustment link plate 83, and make the step rib plate 81 rotate around the adjustment link plate connecting pin 84 to adjust the angle of the step rib plate 81. Therefore, the present invention adjusts the position of the adjustment link plate by adjusting the thread length, thereby adjusting the step rib plate angle, and can be manually adjusted according to the slope of the bridge to ensure that all pedals are in a nearly horizontal position to ensure traffic safety.

[0063] Furthermore, in order to achieve a better anti-skid effect and ensure walking safety, the pedal 86 is provided with an anti-skid pattern.

[0064] The working process of the present invention is as follows: taking the construction of a two-level bridge between the shore and the pontoon as an example,

[0065] like Figure 1 As shown, the distance between the shore base and the pontoon is a certain span (width) L, there is a certain water level difference H between the lowest and highest water levels, and the riverbed also has a certain slope.

[0066] According to the actual needs of the height difference, the height of the bridge end connected to the lifting frame 321 is adjusted by using the bridge lifting transmission unit 33. If the water level rises, when the lifting frame 321 needs to adjust its position, the bridge lifting transmission unit 33 is first used to lift the lifting frame 21 for a short distance, and after it leaves the support surface of the limit bracket 310, the transmission mechanism 34 drives the supporting crossbeam 35 to slide along the connecting platform 3212 to the limit position and retract inward, and is located on the inner side of the limit bracket 310, so as to avoid interference between the supporting crossbeam 35 and the limit bracket 310.

[0067] Next, drive the electric winch 331 to act to wind up the towing rope 332, and synchronously drive the lifting frame 321 to rise in the lifting channel of the lifting tower 31. After the support crossbeam 35 rises to 20 cm above the limit bracket 310 at the corresponding height, drive the transmission mechanism 34 to act again, adjust the support crossbeam 35 into the bearing surface of the limit bracket 310, so that the contact surface of the support crossbeam 35 can be completely placed on the limit bracket 310. Then use the electric winch 331 to let the towing rope unwind and descend in height until the support crossbeam 35 is placed on the limit bracket, so that the entire lifting frame 321 is supported on the limit bracket. Then release the force on the towing rope and disconnect the power input. The bridge height adjustment is completed. During the lifting process of the bridge main body, the first roller 11 at the end of the first-stage bridge 1 rolls freely along the guide rail frame 41, and the second roller 21 at the end of the second-stage bridge 2 rolls freely on the metal backing plate 51 on the floating dock to adapt to the change of the free end during the bridge adjustment process.

[0068] Further, as Figure 1 shown, a three-stage height adjustment is provided on the lifting tower 1. The first-stage bridge 1 and the second-stage bridge 2 are both connected to the connection platform by hinges. After forming a cooperative connection with the bridge connection units on the shore base and the floating dock, they can roll freely during the adjustment of the connection platform and the change of the water level.

[0069] Of course, the present invention is not limited to being applied to a two-stage bridge structure, and can also be applied to a multi-stage bridge structure. Just use a set of bridge lifting systems in cooperation with adjacent bridge main bodies to achieve multi-stage connection.

[0070] Thus, with the change of the water level, the present invention lifts and lowers the first-stage bridge and the second-stage bridge through the bridge lifting system, and under the synergistic action of the first bridge connection unit and the second bridge connection unit, the first-stage bridge and the second-stage bridge are located above the water surface, which not only solves the problem of large span between the shore base and the floating dock, but also can be applied to the actual use environment with large drop, overcomes the disadvantages of building a suspension bridge, a floating bridge or a steel structure truss bridge used in combination with a ladder, has a lower construction cost compared with a single-span steel structure bridge, and is very convenient to operate.

[0071] In terms of safety, the present invention can effectively ensure the use safety, avoid a series of cumbersome processes such as frequent disassembly, installation, and climbing, thereby improving the use safety. In terms of economy, borrowing the floating dock as a fulcrum reduces the construction difficulty and the amount of work, thereby making the structure more economical. In terms of practicality, it not only provides convenience for pedestrians to pass, but also can lay pipelines and cables along the bridge main body according to needs, improving the practicality.

[0072] In summary, the present invention is applicable to large-drop environment scenarios. It not only has a simple structure and low construction cost, but also has adjustable height, is convenient to operate, avoids frequent disassembly and assembly, reduces construction difficulty and workload, and is economical and safe.

[0073] Inspired by the ideal embodiments of the present invention described above, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of the present invention. The technical scope of the present invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A height-adjustable equal-span truss bridge, characterized in that: The invention comprises a primary bridge (1), a secondary bridge (2) and a bridge lifting system (3), as well as a first bridge connection unit (4) built on a shore foundation and a second bridge connection unit (5) arranged on a pontoon. There is a height difference between the first bridge connection unit (4) and the second bridge connection unit (5), and the bridge lifting system (3) is arranged between the first bridge connection unit (4) and the second bridge connection unit (5). One end of the first bridge (1) and one end of the second bridge (2) are rotatably connected to the first bridge connection unit (4) and the second bridge connection unit (5), respectively, and the other end of the first bridge (1) and the other end of the second bridge (2) are rotatably connected to the bridge lifting system (3) at the same time. As the water level changes, the first-level bridge (1) and the second-level bridge (2) are raised and lowered by the bridge lifting system (3), and under the coordinated action of the first bridge connecting unit (4) and the second bridge connecting unit (5), the first-level bridge (1) and the second-level bridge (2) are located above the water surface.

2. The height-adjustable equal-span truss bridge according to claim 1, characterized in that: The bridge lifting system (3) comprises a lifting tower (31), a bridge lifting unit (32) and a bridge lifting transmission unit (33). The lifting tower (31) is arranged between the first bridge connection unit (4) and the second bridge connection unit (5), a plurality of groups of separately arranged limiting brackets (310) are arranged on the lifting tower (31) and along its height direction, and the lifting tower (31) has a lifting channel. The bridge lifting unit (32) comprises a lifting frame (321) rotatably connected to the ends of the primary bridge (1) and the secondary bridge (2), and the lifting frame (321) is located in a lifting channel of the lifting tower (31). The bridge lifting transmission unit (33) comprises an electric winch (331), a traction rope (332), a first pulley group (333) and a second pulley group (334). The electric winch (331) and the first pulley group (333) are both arranged on the top of the lifting tower (31), and the second pulley group (334) is arranged on the top of the lifting frame (321). One end of the traction rope (332) is fixedly connected to the winding drum of the electric winch (331), and the other end is connected to the second pulley group (334). At the same time, the traction rope (332) is also transmission-connected to the first pulley group (333). The electric winch (331) is driven to move, so that it drives the traction rope (332) to be reeled in or unreeled, and simultaneously drives the lifting frame (321) to rise or fall in the lifting channel, so that the lifting frame (321) is supported on the limit bracket (310) of the corresponding height, thereby completing the synchronous lifting and lowering of the first-level bridge (1) and the second-level bridge (2).

3. The height-adjustable equal-span truss bridge according to claim 2, characterized in that: The lifting frame (321) comprises a backbone (3211), a connecting platform (3212) and a plurality of lifting columns (3213), the top and bottom of the plurality of lifting columns (3213) are respectively fixedly connected to the backbone (3211) and the connecting platform (3212), the second pulley group (334) is arranged on the backbone (3211), and the first-level bridge (1) and the second-level bridge (2) are simultaneously rotatably connected to the connecting platform (3212). The connecting platform (3212) is also provided with a supporting crossbeam (35) for supporting the lifting frame (321) as a whole on the limiting bracket (310), and the supporting crossbeam (35) is slidably matched with the connecting platform (3212).

4. The height-adjustable equal-span truss bridge according to claim 3, characterized in that: The lifting frame (321) further comprises a reinforcing beam (3214) for reinforcing the overall strength, and both ends of the reinforcing beam (3214) are respectively fixedly connected to corresponding lifting columns (3213).

5. The height-adjustable equal-span truss bridge according to claim 2, characterized in that: The lifting frame (321) has a connecting platform (3212), and a transmission mechanism (34) and a supporting beam (35) are provided on the connecting platform (3212). The supporting beam (35) is slidably matched with the sliding groove of the connecting platform (3212), and the transmission mechanism (34) is connected to the supporting beam (35) by transmission. The transmission mechanism (34) is driven to operate, so that the supporting beam (35) slides along the sliding groove of the connecting platform (3212) to the limit position under the action of the transmission mechanism (34) and is located on the inner side of the limiting bracket (310), so as to avoid interference between the lifting frame (321) and the limiting bracket (310) during the lifting process.

6. The height-adjustable equal-span truss bridge according to claim 5, characterized in that: The transmission mechanism (34) is a motor or a cylinder. When the transmission mechanism (34) is a motor, the transmission shaft of the motor is connected to the supporting crossbeam (35) through a linear guide rail. When the transmission mechanism (34) is a cylinder, the top rod of the cylinder is connected to the supporting crossbeam (35).

7. The height-adjustable equal-span truss bridge according to claim 2, characterized in that: The lifting tower (31) comprises a tower platform (311) and four tower columns (312) fixedly connected to a ground foundation. The tower platform (311) is fixedly connected to the four tower columns (312) at the same time. The electric winch (331) and the first pulley block (333) are both arranged on the tower platform (311) of the lifting tower (31). The four tower columns (312) enclose a lifting channel for lifting a lifting frame (321). At the same time, a plurality of separately arranged limiting brackets (310) are arranged on the inner side wall of each tower column (312) and along the height direction, and the four limiting brackets (310) at the same height are located on the same plane.

8. The height-adjustable equal-span truss bridge according to claim 2, characterized in that: The first-level bridge (1) and the second-level bridge (2) are respectively provided with a bridge hinge support (6), and the lifting frame (321) is provided with a plurality of lifting hinge supports (3215). The bridge hinge supports (6) of the first-level bridge (1) and the second-level bridge (2) are rotatably connected to the corresponding lifting hinge supports (3215) on the lifting frame (321) via hinges.

9. The height-adjustable equal-span truss bridge according to claim 1, characterized in that: The first bridge connection unit (4) comprises a guide rail frame (41) arranged on the shore foundation, and a first limit pile (42) is provided at a free end of the guide rail frame (41), and one end of the first-level bridge (1) is provided with a first roller (11) rotatably connected thereto, and the first roller (11) is rollingly matched with the guide rail frame (41) and is located inside the first limit pile (42). The second bridge connection unit (5) comprises a metal pad (51) provided on the pontoon, and second limit piles (52) arranged at intervals on the metal pad (51); one end of the secondary bridge (2) is provided with a second roller (21) rotatably connected thereto; the second roller (21) is provided between the two second limit piles (52) and rollingly cooperates with the metal pad (51); The inner side of the pontoon is also provided with a pontoon limiting column (7) fixedly connected thereto.

10. The height-adjustable equal-span truss bridge according to claim 1, characterized in that: The bridge bodies (9) of the first-level bridge (1) and the second-level bridge (2) are both provided with brackets and trough boxes and / or pedestrian stepping units (8) for laying pipelines or cables. The pedestrian step unit (8) comprises a step rib plate (81), a pedal angle adjustment module (82) and an adjustment connecting plate (83); the adjustment connecting plate (83) is assembled and connected to the bridge body (9) via the pedal angle adjustment module (82), and the pedal angle adjustment module (82) is located on one side of the adjustment connecting plate (83); the step rib plate (81) is rotatably connected to the adjustment connecting plate (83) via an adjustment connecting plate connecting pin (84), and both sides of the step rib plate (81) are rotatably supported on the bridge body via a pedal fixing pin (85); at the same time, a pedal (86) is also provided on the top of the step rib plate (81). The pedal angle adjustment module (82) comprises a connecting plate (821), an adjustment positioning plate (822), an adjustment stud (823), a locking nut (824) and an adjustment handle (825). The end of the adjustment connecting plate (83) is provided with a connecting plate (821), and one end of the adjustment stud (823) is fixedly connected to the connecting plate (821). The adjustment stud (823) passes through a screw hole of an adjustment positioning plate (822) provided on the bridge body (9), and the adjustment stud (823) and the adjustment positioning plate (822) are fastened together by the locking nuts (824) on both sides of the adjustment positioning plate (822). The adjustment handle (825) is fixedly connected to the locking nut (824) provided on the outer side of the adjustment positioning plate (822). The locking nut (824) on the inner side of the adjustment positioning plate (822) is loosened, the adjustment handle (825) is rotated, and the adjustment connecting plate (83) is translated to make the step rib plate (81) rotate around the adjustment connecting plate connecting pin (84), thereby achieving angle adjustment of the step rib plate (81).

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