A steel box girder transport vehicle and method for cable-stayed bridges used in steep access roads
By combining L-shaped plates and electromagnet limiting rings, the problem of steel box girder slippage on steep slope access roads was solved, achieving stable and precise placement of the steel box girder and improving transportation efficiency and stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CCCC THIRD HIGHWAY ENG CO LTD
- Filing Date
- 2022-12-13
- Publication Date
- 2026-05-26
AI Technical Summary
When transporting steel box girder welding modules on steep slope access roads, the modules are prone to slippage, which can damage the guardrails or cause them to slide off the platform. They are also difficult to lift and place accurately, affecting transportation efficiency and stability.
The structure adopts an L-shaped plate enclosure, in which the limiting section and the supporting section of the L-shaped plate are used together. The plate is set horizontally by a hinge shaft, the supporting section is tilted upward, the limiting section is turned outward, and the limiting section is set vertically after the steel box girder presses down on the supporting section. Combined with the electromagnetic limit ring for reinforcement, the stability of the steel box girder is achieved.
This improved the efficiency and stability of steel box girder hoisting on steep slope access roads, reduced the risk of guardrail damage, and ensured that the steel box girder was accurately hoisted and stabilized on the platform.
Smart Images
Figure CN115782732B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of bridge construction, and in particular to a girder transport vehicle and method for steel box girders of cable-stayed bridges used for access roads with steep gradients. Background Technology
[0002] Steel box girders are a common structural form for long-span bridges. By prefabricating steel box girder segments in the prefabrication yard, the steel box girders are divided into three groups of steel box girder welding modules. Then, a girder transport vehicle is used to transport the steel box girder welding modules to the pre-assembly yard for pre-assembly. Finally, the girder transport vehicle is used to transport the steel box girder welding modules one by one to the gantry crane lifting station at the pier position and lift them onto the bridge.
[0003] When transporting steel box girder welding modules on steep slopes using a beam transport vehicle, the modules may slip under their own weight. Typically, guardrails are installed around the loading platform at the rear of the transport vehicle to prevent the modules from sliding off. However, due to the module's weight, it generates significant kinetic energy during slippage, easily damaging the guardrails or even knocking it off the platform. Reducing the area enclosed by the guardrails could shorten the slippage distance and decrease the increase in kinetic energy. However, this smaller area makes it difficult to accurately place the modules onto the loading platform, thus leaving room for improvement. Summary of the Invention
[0004] In order to facilitate the placement of steel box girders on the platform while also ensuring their stability on the platform, this application provides a steel box girder transport vehicle and method for cable-stayed bridges with steep slopes.
[0005] The technical solution provided in this application for a steel box girder transport vehicle and method for cable-stayed bridges used on steep slope access roads is as follows:
[0006] A steel box girder transport vehicle for cable-stayed bridges with steep gradient access roads includes a transport vehicle body and a platform for placing the steel box girder. Several L-shaped plates are hinged to the surface of the platform. The hinge shafts of the L-shaped plates are located at the bends of the L-shaped plates and are horizontally positioned. The L-shaped plates are circumferentially distributed to form a protective area. Each L-shaped plate includes mutually perpendicular restraining sections and supporting sections. Before the steel box girder is positioned, the restraining sections are all turned outwards away from the protective area, and the supporting sections are all located inside the protective area and inclined upwards. When the steel box girder is hoisted from top to bottom into the protective area, the lower surface of the steel box girder abuts against the ends of the supporting sections, pressing the supporting sections flat onto the platform surface. The restraining sections follow the supporting sections and swing to a vertical position towards the protective area, surrounding the perimeter of the steel box girder.
[0007] By adopting the above technical solution, the limiting sections of each L-shaped plate are flipped outwards from the enclosed area, thereby forming an opening at the top of the enclosed area to facilitate the hoisting of the steel box girder into the enclosed area. During the lowering process, the steel box girder presses down on the supporting section of the L-shaped plate located within the enclosed area. As the supporting section swings down, the limiting section swings towards the enclosed area. As the limiting section swings to a vertical position, it also gradually aligns the steel box girder towards the center of the enclosed area. Once the steel box girder is in place, the supporting section is flattened onto the surface of the platform, and each L-shaped plate reaches a stable state. At the same time, the vertically positioned limiting sections enclose the perimeter of the steel box girder, thus facilitating the placement of the steel box girder on the platform and ensuring its stability on the platform. This improves the efficiency of hoisting the steel box girder and enhances its stability during transportation.
[0008] Preferably, the end of the support segment furthest from the limiting segment is bent downwards.
[0009] By adopting the above technical solution, the end of the support section is formed with an arc surface. The smooth contact surface can reduce the friction between the lower end face of the steel box girder and the end of the support section, and at the same time, it has a guiding effect, making the L-shaped plate swing more smoothly.
[0010] Preferably, a counterweight is provided on the outer side of the support section.
[0011] By adopting the above technical solution, the limiting section of the L-shaped plate can be flipped outwards from the enclosure area under the action of the counterweight. At the same time, the counterweight can support the limiting section, which helps the limiting section to maintain its outward flipped state before the steel box girder is in place.
[0012] Preferably, when the end of the counterweight away from the limiting section abuts against the surface of the platform, the angle formed by the limiting section and the platform is 45° to 60°.
[0013] By adopting the above technical solution, under the condition that the flare formed in each restrictive section is large enough, the component force of the steel box girder in the extension direction of the support section is reduced, which helps to reduce the probability of the support section being bent or broken.
[0014] Preferably, the surface of the platform is provided with a limiting ring, which surrounds the enclosure area. The counterweight is provided with a driving component. When the limiting section is swung to a vertical position, the driving component drives the limiting ring to move upward, and the limiting ring surrounds the outside of several limiting sections.
[0015] By adopting the above technical solution, the limiting ring provides inward preload to the limiting section, which plays a reinforcing role and further improves the stability of the L-shaped plate.
[0016] Preferably, the limiting ring is an iron ring, and the driving component is an electromagnet. When the limiting segment is swung to a vertical position, the electromagnet is located directly above the limiting ring. The limiting ring moves upward under the magnetic attraction of the electromagnet and is magnetically fixed to the electromagnet.
[0017] By adopting the above technical solution, the upward movement of the limiting ring is completed by magnetic attraction, which helps to reduce component connection and equipment maintenance problems, and can quickly achieve the purpose of reinforcement.
[0018] Preferably, the shelf has an annular groove for receiving the limiting ring, and the annular groove is located on the periphery of the enclosure area.
[0019] By adopting the above technical solution, the limiting ring is housed in the annular groove. The annular groove restricts the limiting ring to ensure that the position of the limiting ring does not shift, making it easier for the electromagnet to pick up the limiting ring.
[0020] A method for transporting steel box girders for cable-stayed bridges using a girder transport vehicle for steep slope access roads includes the following steps:
[0021] S1: Loading preparation: The limiting ring is stored in the annular groove, and the L-shaped plate is flipped outward under the action of the counterweight. The counterweight abuts against the surface of the platform. The support sections of the L-shaped plate are all located inside the enclosure area and are inclined upward.
[0022] S2: Lifting and lowering the steel box girder: Lift the steel box girder into the enclosure area formed by several L-shaped plates. The lower surface of the steel box girder abuts against the ends of several support sections and flattens the support sections onto the surface of the platform. At the same time, several restraining sections follow the support sections and are swung to a vertical position in the direction of the enclosure area. Several restraining sections are set up around the steel box girder.
[0023] S3: Enclosure reinforcement: The electromagnet is energized and pulls the limiting ring out of the annular groove and surrounds the outside of several limiting sections;
[0024] S4: Steel box girder transfer: The girder transport vehicle transfers the steel box girder to the next construction area.
[0025] By adjusting the restraint section to a vertical position, the restraint section straightens the steel box girder, which helps improve the efficiency of lifting the steel box girder. After the steel box girder is in place, the support section is flattened onto the surface of the platform, and each L-shaped plate reaches a stable state. At the same time, each vertical restraint section surrounds the steel box girder and is reinforced by the limiting ring. This makes it easy to place the steel box girder on the platform and also stabilizes the steel box girder on the platform, which helps improve the stability of the steel box girder during transportation.
[0026] Preferably, in S1, a box body is manufactured to hold the steel box girder welding module. The width of the box body is equal to the width of the steel box girder welding module, and the length of the box body is greater than the length of the steel box girder welding module. Each of the two long side walls of the box body has three through holes, arranged opposite each other. The three through holes are distributed along the length of the long side walls, with the through hole in the middle positioned higher than the through holes on the sides. A rod is inserted between each pair of opposite through holes on the two long side walls of the box body. In S1, after the steel box girder welding module is placed inside the box body, the three rods are inserted into the corresponding through holes. The two side rods abut against the sides of the steel box girder welding module, and the middle rod abuts against the upper surface of the steel box girder welding module. In S2, the box body containing the steel box girder welding module is hoisted into the enclosure area formed by several L-shaped plates. The box body applies pressure to the supporting sections, causing several limiting sections to surround the perimeter of the box body.
[0027] Since the shapes of the various welding modules are not uniform, by adopting the above technical solution, using steel box girder welding modules of different shapes and specifications with uniform box bodies, the pressure of the steel box girder welding modules can be evenly distributed among the support sections, achieving the purpose of stable rotation of the L-shaped plate. At the same time, by inserting the plug rod into the plug hole on the side wall of the box body, the sliding of the steel box girder welding modules in the box body is restricted, which helps to improve the stability of the steel box girder welding modules during transportation.
[0028] Preferably, the through holes on both sides of the long side wall of the box body are straight holes, and mounting blocks are provided on both sides of the long side wall of the box body. The mounting blocks are threaded with top screws along the length of the straight holes, and the top screws on both sides drive the two side rods to move closer to each other and abut against both sides of the steel box girder welding module.
[0029] By adopting the above technical solution, the assembly and welding modules can be fixed in different positions, thus improving installation flexibility. Attached Figure Description
[0030] Figure 1 This is a schematic diagram of the state of the steel box girder welding module in a cable-stayed bridge steel box girder transport vehicle used for a steep slope access road, as described in Embodiment 1 of this application, before it is in place.
[0031] Figure 2 yes Figure 1 Enlarged diagram of point A in the middle.
[0032] Figure 3 This is a schematic diagram of the steel box girder welding module after it has been positioned in a steel box girder transport vehicle for a cable-stayed bridge with a steep slope, according to Embodiment 1 of this application.
[0033] Figure 4 This is a schematic diagram of the overall structure of the steel box girder assembly and welding module located inside the box girder of a cable-stayed bridge steel box girder transport vehicle used for a steep slope access road, according to Embodiment 2 of this application.
[0034] Figure 5 This is a schematic diagram of the state in which the steel box girder assembly and welding module is located inside the box girder of a cable-stayed bridge steel box girder transport vehicle used for a steep slope access road, according to Embodiment 2 of this application.
[0035] Explanation of reference numerals in the attached drawings: 1. Beam transport vehicle body; 2. Placement platform; 21. Clearance groove; 22. Annular groove; 3. L-shaped plate; 31. Restriction section; 32. Support section; 321. Curved surface; 33. Bending section; 34. Hinge shaft; 4. Enclosure area; 5. Counterweight block; 6. Limiting ring; 7. Steel box girder welding module; 8. Box body; 81. Through hole; 82. Mounting block; 83. Top screw; 9. Insert rod. Detailed Implementation
[0036] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.
[0037] Example 1
[0038] This application discloses a girder transport vehicle and method for steel box girders of cable-stayed bridges used on steep slope access roads. (Refer to...) Figure 1 and Figure 2 A girder transport vehicle for cable-stayed bridges with steep slopes includes a girder transport vehicle body 1 and a storage platform 2 for placing the steel box girder welding modules 7.
[0039] Reference Figure 2 and Figure 3 Four L-shaped plates 3 are hinged to the surface of the platform 2. The hinge axis 34 of the L-shaped plates 3 is located at the bend 33 of the L-shaped plates 3, and the hinge axis 34 of the L-shaped plates 3 is horizontally arranged. The four L-shaped plates 3 are distributed circumferentially to form an enclosure area 4. The enclosure area 4 is rectangular to fit the outer contour of the steel box girder welding module 7.
[0040] The L-shaped plate 3 includes mutually perpendicularly arranged limiting sections 31 and supporting sections 32. The supporting sections 32 are located within the enclosure area 4. Before the steel box girder welding module 7 is in place, all four limiting sections 31 are turned outward away from the enclosure area 4. At this time, all four supporting sections 32 are located inside the enclosure area 4 and are inclined upward. When the steel box girder welding module 7 is hoisted from top to bottom into the enclosure area 4, the lower surface of the steel box girder welding module 7 abuts against the ends of the four supporting sections 32 and flattens the supporting sections 32 onto the surface of the platform 2. At the same time, the four limiting sections 31 follow the supporting sections 32 and swing towards the enclosure area 4 to a vertical state. During the process of the limiting sections 31 swinging to a vertical state, the limiting sections 31 also gradually straighten the steel box girder welding module 7 towards the center of the enclosure area 4. Finally, the four limiting sections 31 surround the steel box girder welding module 7. Once the steel box girder welding module 7 is in place, the support section 32 is flattened onto the surface of the platform 2, and each L-shaped plate 3 reaches a stable state. At the same time, each vertically positioned restriction section 31 surrounds the steel box girder welding module 7, thus facilitating the placement of the steel box girder welding module 7 on the platform 2 and ensuring its stability on the platform 2. This improves the efficiency of hoisting the steel box girder welding module 7 and its stability during transportation.
[0041] It is important to emphasize that in each L-shaped plate 3, the end of the support section 32 furthest from the limiting section 31 is bent downwards, forming an arc surface 321 at the end of the support section 32. This smooth contact surface reduces friction between the lower end face of the steel box girder welding module 7 and the end of the support section 32, while also providing a guiding effect, facilitating smoother swinging of the L-shaped plate 3. Furthermore, a clearance groove 21 is provided on the surface of the platform 2. When the bottom of the support section 32 abuts against the surface of the platform 2, the bent portion of the support section 32 can be accommodated within the clearance groove 21, ensuring that the support section 32 fits snugly against the surface of the platform 2, thus transferring the load of the steel box girder welding module 7 to the platform 2.
[0042] Each support segment 32 has a counterweight 5 fixed to its outer side. When the end of the counterweight 5 away from the limiting segment 31 abuts against the surface of the platform 2, the angle formed between the limiting segment 31 and the platform 2 is 45° to 60°. In this embodiment, the angle between the limiting segment 31 and the surface of the platform 2 is set at 60°. This reduces the component force of the steel box girder welding module 7 in the extension direction of the support segment 32, provided that the flared opening formed by each limiting segment 31 is sufficiently large, thus reducing the probability of the support segment 32 being bent or broken.
[0043] An annular groove 22 is formed on the upper surface of the platform 2, and the annular groove 22 is located around the perimeter of the enclosure area 4. The annular groove 22 contains a limiting ring 6. Each counterweight 5 is equipped with a driving component, specifically an electromagnet, and the limiting ring 6 is an iron ring. When the limiting section 31 is swung to the vertical position, the electromagnet is energized. Under the magnetic attraction of the electromagnet, the limiting ring 6 moves upward, and the limiting ring 6 surrounds the outside of the four limiting sections 31, with the inner side of the limiting ring 6 abutting against the outer side of the limiting section 31.
[0044] A method for transporting steel box girders for cable-stayed bridges using a girder transport vehicle for steep slope access roads includes the following steps:
[0045] S1: Loading preparation: The limiting ring 6 is stored in the annular groove 22, and the L-shaped plate 3 is turned outward under the action of the counterweight 5. The counterweight 5 abuts against the surface of the platform 2. The support sections 32 of the L-shaped plate 3 are all located inside the enclosure area 4 and are set upward at an angle.
[0046] S2: Lifting and placing the steel box girder welding module 7: Lift the steel box girder welding module 7 into the enclosure area 4 formed by several L-shaped plates 3. The lower surface of the steel box girder welding module 7 abuts against the ends of several support sections 32 and flattens the support sections 32 onto the surface of the platform 2. At the same time, several limiting sections 31 follow the support sections 32 and swing to a vertical position in the direction of the enclosure area 4. The several limiting sections 31 surround the steel box girder welding module 7.
[0047] S3: Enclosure reinforcement: The electromagnet is energized and pulls the limiting ring 6 out of the annular groove 22 and surrounds the outside of several limiting sections 31.
[0048] S4: Transfer of steel box girder welding module 7: The girder transport vehicle 1 transfers the steel box girder welding module 7 to the next construction area.
[0049] Example 2
[0050] A method for transporting steel box girders for cable-stayed bridges using a girder transport vehicle for steep slope access roads includes the following steps:
[0051] S1: Loading Preparation: The limiting ring 6 is stored in the annular groove 22, and the L-shaped plate 3 is turned outward under the action of the counterweight 5. The counterweight 5 abuts against the surface of the platform 2. The supporting sections 32 of the L-shaped plate 3 are all located inside the enclosure area 4 and are inclined upward. The box body 8 is made, and the steel box girder welding module 7 is placed in the box body 8 in advance. The width of the box body 8 is equal to the width of the steel box girder welding module 7, and the length of the box body 8 is greater than the length of the steel box girder welding module 7. Three through holes 81 are passed through the two long side walls of the box body 8 and are arranged opposite each other. The three through holes 81 are distributed along the length of the long side wall. The through hole 81 in the middle is higher than the through holes 81 on both sides. A plug rod 9 is inserted between the two pairs of through holes 81 that are opposite each other between the two long side walls of the box body 8.
[0052] Among them, the through holes 81 on both sides of the long side wall of the box body 8 are straight holes, and the mounting blocks 82 are provided on both sides of the long side wall of the box body 8. The mounting blocks 82 are threaded with top screws 83 along the length of the straight holes. The top screws 83 on both sides drive the two side rods 9 to approach each other and abut against both sides of the steel box girder welding module 7.
[0053] After the steel box girder welding module 7 is placed inside the box body 8, the three insertion rods 9 are inserted into the corresponding through holes 81. The top screws 83 on both sides of the box body 8 are rotated so that the two insertion rods 9 on both sides abut against the two sides of the steel box girder welding module 7, and the middle insertion rod 9 abuts against the upper surface of the steel box girder welding module 7, thereby achieving the purpose of restricting the steel box girder welding module 7.
[0054] S2: Lifting and placing the steel box girder welding module 7: Lift the box 8 containing the steel box girder welding module 7 to the enclosure area 4 formed by several L-shaped plates 3. The lower surface of the box 8 abuts against the ends of several support sections 32 and flattens the support sections 32 onto the surface of the platform 2. At the same time, several limiting sections 31 follow the support sections 32 and swing to a vertical position in the direction of the enclosure area 4. The several limiting sections 31 are arranged around the box 8.
[0055] S3: Enclosure reinforcement: The electromagnet is energized and pulls the limiting ring 6 out of the annular groove 22 and surrounds the outside of several limiting sections 31.
[0056] S4: Transfer of steel box girder welding module 7: The girder transport vehicle 1 transfers the steel box girder welding module 7 to the next construction area, pulls out the insertion rod 9, and lifts out the steel box girder welding module 7.
[0057] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A steel box girder transport vehicle for cable-stayed bridges used on steep slope access roads, characterized in that: The system includes a beam transport vehicle body (1) and a platform (2) for placing the steel box girder welding module (7). Several L-shaped plates (3) are hinged to the surface of the platform (2). The hinge axis (34) of each L-shaped plate (3) is located at the bend (33) of the L-shaped plate (3), and the hinge axis (34) of the L-shaped plate (3) is horizontally positioned. The several L-shaped plates (3) are circumferentially distributed to form an enclosure area (4). Each L-shaped plate (3) includes mutually perpendicularly arranged limiting sections (31) and supporting sections (32). Before the steel box girder welding module (7) is in place, the several limiting sections... All segments (31) are turned outwards away from the enclosure area (4), and several of the support segments (32) are located inside the enclosure area (4) and are inclined upwards. When the steel box girder welding module (7) is hoisted from top to bottom into the enclosure area (4), the lower surface of the steel box girder welding module (7) abuts against the ends of several of the support segments (32) and flattens the support segments (32) onto the surface of the platform (2). Several restricting segments (31) follow the support segments (32) and swing to a vertical state in the direction of the enclosure area (4). Several restricting segments (31) surround the steel box girder welding module (7). A counterweight (5) is provided on the outside of the limiting section (31); When the end of the counterweight (5) away from the limiting section (31) abuts against the surface of the platform (2), the angle formed by the limiting section (31) and the platform (2) is 45° to 60°. The surface of the platform (2) is provided with a limiting ring (6), which surrounds the enclosure area (4). The counterweight (5) is provided with a driving component. When the limiting section (31) is swung to a vertical position, the driving component drives the limiting ring (6) to move upward. The limiting ring (6) surrounds the outside of several limiting sections (31). The limiting ring (6) is an iron ring, and the driving component is an electromagnet. When the limiting segment (31) is swung to a vertical position, the electromagnet is located directly above the limiting ring (6). The limiting ring moves upward under the magnetic attraction of the electromagnet and is magnetically fixed to the electromagnet.
2. The steel box girder transport vehicle for cable-stayed bridges used in steep access roads according to claim 1, characterized in that: The support section (32) is bent downward at the end away from the limiting section (31).
3. The steel box girder transport vehicle for cable-stayed bridges used in steep access roads according to claim 1, characterized in that: The shelf (2) has an annular groove (22) for storing the limiting ring (6), and the annular groove (22) is located around the enclosure area (4).
4. A method for transporting steel box girders for cable-stayed bridges using a girder transport vehicle for steep-slope access roads, employing the steel box girder transport vehicle described in claim 3, characterized in that: Includes the following steps: S1: Loading preparation: The limiting ring (6) is stored in the annular groove (22), and the L-shaped plate (3) is flipped outward under the action of the counterweight (5). The counterweight (5) abuts against the surface of the platform (2). The support section (32) of the L-shaped plate (3) is located inside the enclosure area (4) and is inclined upward. S2: Lifting and placing the steel box girder welding module (7): Lift the steel box girder welding module (7) into the enclosure area (4) formed by several L-shaped plates (3). The lower surface of the steel box girder welding module (7) abuts against the ends of several support sections (32) and flattens the support sections (32) onto the surface of the platform (2). At the same time, several restricting sections (31) follow the support sections (32) and swing to a vertical position in the direction of the enclosure area (4). The several restricting sections (31) surround the steel box girder welding module (7). S3: Enclosure reinforcement: The electromagnet is energized and pulls the limiting ring (6) out of the annular groove (22) and surrounds the outside of several limiting sections (31); S4: Steel box girder welding module (7) transfer: The girder transport vehicle (1) transfers the steel box girder welding module (7) to the next construction area.
5. A method for transporting steel box girders for cable-stayed bridges using a girder transport vehicle for a steep-slope access road, as described in claim 4, characterized in that: In S1, a box body (8) is fabricated. The box body (8) is used to place the steel box girder welding module (7). The width of the box body (8) is equal to the width of the steel box girder welding module (7), and the length of the box body (8) is greater than the length of the steel box girder welding module (7). Each of the two long side walls of the box body (8) has three through holes (81) that are arranged opposite each other. The three through holes (81) are distributed along the length of the long side wall. The through hole (81) in the middle is higher than the through holes (81) on both sides. Between the two long side walls of the box body (8), the two pairs of through holes (81) facing each other in each group are arranged opposite each other. There is an interstitial rod (9). In S1, after the steel box girder welding module (7) is placed in the box (8), three rods (9) are inserted into the corresponding through holes (81). The two side rods (9) abut against the two sides of the steel box girder welding module (7), and the middle rod (9) abuts against the upper surface of the steel box girder welding module (7). In S2, the box (8) containing the steel box girder welding module (7) is hoisted to the enclosure area (4) formed by several L-shaped plates (3). The box (8) applies pressure to the support section (32), causing several limiting sections (31) to surround the box (8).
6. A method for transporting steel box girders for cable-stayed bridges using a girder transport vehicle for a steep-slope access road, as described in claim 5, characterized in that: The through holes (81) on both sides of the long side wall of the box body (8) are straight holes. Mounting blocks (82) are provided on both sides of the long side wall of the box body (8). The mounting blocks (82) are threaded with top screws (83) along the length of the straight hole. The top screws (83) on both sides drive the two side rods (9) to approach each other and abut against the two sides of the steel box girder welding module (7).