Beam flat car for special-shaped box girder

Abstract

The application relates to the technical field of box girder construction, and particularly discloses a beam transporting flatcar for special-shaped box girders, which comprises a frame, a track arranged on a beam transporting platform, rotating assemblies arranged at the lower ends of the four corners of the frame, and track wheels matched with the track and arranged at the lower ends of the rotating assemblies. The technical problem that the steel box girder is not accurate enough in position and needs to be repeatedly adjusted to reach the designated position when the steel box girder is transported by using the existing beam transporting flatcar is solved.

Description

Technical Field

[0001] This utility model relates to the field of box girder construction technology, specifically to a flatbed truck for transporting irregularly shaped box girders. Background Technology

[0002] Currently, bridge construction often involves installing steel box girders across existing highways. To ensure construction safety and quality, construction units frequently employ a single-point, step-by-step hydraulic jacking method. However, this method suffers from drawbacks in practice, including slow jacking speeds and difficulties in setting up lateral limiting devices, leading to extended construction periods and increased costs. Furthermore, the large spans (greater than 50m) and variable cross-sections of the steel box girders result in significant stiffness variations at the cross-sections, making it easy for high-stress zones to form in the transition area during jacking, potentially causing local buckling or weld cracking. Finite element analysis (FEA) is needed to simulate the stress distribution at each stage of jacking and optimize the cross-section transition design, further extending the construction period.

[0003] To address the aforementioned issues, existing technologies are increasingly employing girder transport vehicles for positioning box girders or other irregularly shaped box girders in variable cross-section bridges. This process requires setting up a girder transport platform, on which the transport vehicle moves the box girder to its precise installation location. However, due to their irregular structure, irregularly shaped girder transport vehicles are prone to instability of the steel box girder's center of gravity during transport. To prevent instability during transport of irregularly shaped girder (including variable cross-section girder), the industry has adjusted the structure of girder transport vehicles. For example, patent application CN202023199986.X discloses a variable cross-section steel box girder modular vehicle support system. This system incorporates a support mechanism, including a fixed end, a support rod, and a support end fixedly connected to the variable cross-section steel box girder body. The design of the support end provides support to the variable cross-section steel box girder body in the event of instability, thereby enhancing the stability of the modular vehicle body during transport.

[0004] While the aforementioned technologies can facilitate the transportation of irregularly shaped box girders and provide some support in the event of instability, the steel box girder segments need to be assembled after transportation. Accurate positioning of the steel box girder during assembly is crucial; if the positioning is inaccurate, repeated vehicle repositioning and adjustments are necessary, thus slowing down the construction process. Utility Model Content

[0005] The purpose of this utility model is to provide a flatbed truck for transporting irregularly shaped box girders, in order to solve the technical problem mentioned above in the prior art where the positioning of steel box girders is not accurate enough when using a flatbed truck to transport steel box girders, requiring repeated adjustments of the flatbed truck to reach the designated position.

[0006] To solve the above problems, the technical solution adopted by this utility model is as follows: a flatcar for transporting irregular box girders includes a frame and a track set on the transport platform. The frame has a rotating assembly at the lower end of its four corners, and the rotating assembly has a track wheel that matches the track at the lower end.

[0007] The beneficial effects of this implementation plan are as follows: 1. After the steel box girder is transported, the segments need to be spliced ​​and installed. Accurate positioning of the steel box girder is crucial during this process. If the steel box girder transported by the girder transport vehicle is not accurately positioned, its position needs adjustment. However, due to the large size of the steel box girder, this adjustment is inconvenient. Existing technologies require repeated vehicle movement for adjustment, which slows down construction. In contrast, the girder transport flatcar of this application is a rail-mounted vehicle. Tracks are set on the girder transport platform, and the precise layout of the tracks ensures accurate positioning. Therefore, when the girder transport flatcar of this application transports the steel box girder, its tracks provide initial positioning, resulting in more accurate positioning of the steel box girder compared to existing technologies.

[0008] 2. When adjusting the docking angle of the steel box girder, existing girder transport vehicles can only be moved back and forth repeatedly, much like a private car in daily life, which is very cumbersome. Furthermore, for box girders of variable cross-section bridges or other irregularly shaped box girders, this repeated back-and-forth movement can easily cause instability of the steel box girder's center of gravity. In contrast, this application incorporates a rotating assembly between the track wheels and the frame. This eliminates the need to move the wheels when adjusting the docking angle of the steel box girder. Instead, the rotating assembly directly rotates the frame of the girder transport vehicle, allowing the steel box girder to rotate along with the frame for fine-tuning, thus making the adjustment much more convenient.

[0009] Furthermore, the vehicle frame includes an outer frame formed by chassis steel beams, with connecting steel boxes provided between the chassis steel beams, and the rotating assembly disposed in the connecting steel boxes.

[0010] Furthermore, the chassis steel beam is provided with a connecting plate, and the connecting steel box is also provided with a connecting plate. Several bolt holes are opened on the connecting plate, and the chassis steel beam and the connecting steel box are fixed by bolts and nuts passing through the bolt holes on the connecting plate.

[0011] Furthermore, the four corners of the chassis steel beam are directly welded into a rectangular outer frame, and the four corners of the outer frame are welded and fixed to the upper end of the connecting steel box.

[0012] Furthermore, a wheel seat is connected to the lower end of the rotating assembly, the track wheel is mounted on the wheel seat, and a support spring is provided between the connecting steel box and the wheel seat.

[0013] Furthermore, the wheel seat includes a top connecting plate and a side mounting plate, and the side mounting plate is provided with two track wheels. Attached Figure Description

[0014] Figure 1 This is a front structural diagram of the present invention. Figure 2 for Figure 1 Enlarged view of position A in the middle. Figure 3 This is a side view of the present invention. Figure 4 for Figure 3 Enlarged view of position B in the middle. Figure 5 This is a top view of the structure of this utility model. Detailed Implementation

[0015] The following detailed description illustrates the specific implementation method: The reference numerals in the accompanying drawings include: 1. Beam transport platform; 2. Chassis steel beam; 21. Connecting plate; 3. Rail; 4. Connecting steel box; 5. Rotating assembly; 5. Suspension bearing; 51. Main shaft; 52. Bearing seat; 53. Wheel seat; 6. Top connecting plate; 61. Side mounting plate; 62. Wheel axle; 63. Rail wheel; 7. Wheel body bearing; 71. Central support beam; 8.

[0016] Implementation, for example, attached Figure 1-5 As shown: When transporting steel box girders, the transport platform 1 needs to be positioned close to the designed height of the steel box girder. This allows for direct lifting of the steel box girder using jacks after it has been transported to its designated location, facilitating its docking and installation without further lifting. In this embodiment, a temporary road surface is temporarily occupied directly below the location where the steel box girder needs to be transported. A temporary foundation is constructed using reinforced concrete, and steel pipe columns are welded and installed using steel plates pre-embedded within the temporary foundation as a support structure. Main beams and distribution beams are then installed on these steel pipe columns, and a temporary support frame is erected as the transport platform 1. After the transport platform 1 is erected, a track 3 is installed on it. The track 3 must be precisely laid out to ensure straight alignment and consistent top elevation, and it can be fully welded and fixed to the distribution beams at the top of the transport platform 1. A winch for driving the transport flatcar is installed at the end of the track 3 on the transport platform 1.

[0017] A flatcar for transporting irregularly shaped box girders, comprising a frame, such as... Figure 5 As shown, it includes an outer frame formed by chassis steel beams 2 and a grid platform formed by central support beams 8. Connecting steel boxes 4 are provided at each of the four corners of the outer frame formed by the chassis steel beams 2. The connecting steel boxes 4 are fixedly connected to the chassis steel beams 2, as shown. Figure 2As shown, in this embodiment, a connecting plate 21 with a cross-section larger than the chassis steel beam 2 is welded to the end of the chassis steel beam 2. Several bolt holes are provided on the outer ring of the connecting plate 21. A corresponding connecting steel box 4 also has a connecting plate with bolt holes. The chassis steel beam 2 is fixed to the connecting steel box 4 using a combination of bolts and nuts. Each connecting steel box 4 has the same structure, with connecting plates on two adjacent sides of its four sides, such as... Figure 5 As shown, using the two sides equipped with connecting plates, the connecting steel box 4 can connect to a chassis steel beam 2 in two vertical directions respectively. The outer frame of the vehicle frame is formed by the fixed connection of the four connecting steel boxes 4 and the four chassis steel beams 2. Several central support beams 8 are welded inside the outer frame to form the internal support grid platform of the beam transport flatcar.

[0018] The connecting steel box 4 has a square box structure, and a rotating assembly 5 is installed inside it. The rotating assembly 5 includes a bearing housing 53, such as... Figure 2 As shown, the bearing housing 53 is bolted to the vertical center of the inner part of the connecting steel box 4. A rotating spindle 52 is mounted on the bearing housing 53, and the rotating spindle 52 is interference-fitted onto the bearing housing 53 via a suspension bearing 51. A wheel seat 6 is connected to the rotating spindle 52. The wheel seat 6 includes a top connecting plate 61, with a through hole at the center of its top surface. The rotating spindle 52 passes through the through hole and is fixed to the connecting plate. The fixing method includes, but is not limited to, welding. Figure 2 The direction describes the orientation. The top connecting plate 61 of the wheel seat 6 has side mounting plates 62 on both sides along the direction of the track 3. The side mounting plates 62 have mounting holes for the track wheel 7. The axle 63 is passed through the mounting holes by aligning the main shaft hole in the middle of the track wheel 7 to form a rotatable connection. A wheel bearing 71 is provided between the axle 63 and the main shaft hole in the middle of the track wheel 7, making the rotation of the track wheel 7 smoother. Figure 3 , Figure 4 As shown, the side mounting plate 62 in this embodiment has two mounting holes for the track wheels 7, so two track wheels 7 are installed.

[0019] This application also includes a front-mounted towing system and a rear-mounted pushing system. Each of the front-mounted towing system and the rear-mounted pushing system is equipped with a set of sensor systems. The two sets of sensors are controlled in a unified manner by a computer, which can realize the precise synchronous operation of the two systems.

[0020] In another embodiment, the outer frame is formed by direct welding between the chassis steel beams 2, and the four corners of the outer frame are directly welded to the top of the connecting steel box 4.

[0021] In another embodiment, the rotating spindle 52 extends out and connects to the wheel seat 6, and a support spring is provided between the bottom of the connecting steel box 4 and the upper end of the wheel seat 6.

[0022] The above descriptions are merely embodiments of this utility model, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A flatcar for transporting irregularly shaped box girders, comprising a rectangular frame, characterized in that: The frame includes an outer frame formed by chassis steel beams, a rotating assembly is installed inside the chassis steel beams, and a track is set on the beam transport platform. The lower end of the rotating assembly is connected to a track wheel that matches the track.

2. The flatcar for transporting irregularly shaped box girders according to claim 1, characterized in that: A connecting steel box is provided between the chassis steel beams, and the rotating assembly is installed in the connecting steel box.

3. The flatcar for transporting irregularly shaped box girders according to claim 2, characterized in that: The chassis steel beam is provided with a connecting plate, and the connecting steel box is also provided with a connecting plate. Several bolt holes are opened on the connecting plate, and the chassis steel beam and the connecting steel box are fixed by bolts and nuts passing through the bolt holes on the connecting plate.

4. The flatcar for transporting irregularly shaped box girders according to claim 2, characterized in that: The four corners of the chassis steel beam are directly welded into a rectangular outer frame, and the four corners of the outer frame are welded and fixed to the upper end of the connecting steel box.

5. The flatcar for transporting irregularly shaped box girders according to claim 2, characterized in that: The lower end of the rotating assembly is connected to a wheel seat, the track wheel is mounted on the wheel seat, and a support spring is provided between the connecting steel box and the wheel seat.

6. The flatcar for transporting irregularly shaped box girders according to claim 5, characterized in that: The wheel seat includes a top connecting plate and a side mounting plate, and the side mounting plate is provided with two track wheels.

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