Ultra-high section steel box girder cantilever block assembly platform

Abstract

The utility model discloses an ultrahigh-section steel box girder cantilever block assembly platform which comprises a cross beam stretching across a top plate of a steel box girder, and the cross beam is arranged on the top plate of the steel box girder through a longitudinal moving mechanism arranged below the cross beam so that the cross beam can longitudinally move on the top plate of the steel box girder. L-shaped working platforms are fixedly connected to the lower portions of the two ends of the cross beam, the L-shaped working platforms are oppositely distributed at the two ends of the top of the steel box girder, and an operation space enough for containing the cantilever block bodies is reserved between the L-shaped working platforms and the side end of a top plate of the steel box girder; the horizontal end of the L-shaped working platform is provided with a guide roller which can abut against the side wall of the steel box girder. The assembling platform can be built in an adaptive size according to the cross section size characteristics of the steel box girder, and can be changed according to the structure size of the actually constructed steel box girder. A simple tool is adopted for manufacturing, and installation, use and disassembly are convenient. The device is light in weight, large in rigidity, safe, reliable, convenient, easy to implement and low in cost.

Description

Technical Field

[0001] This utility model relates to the field of steel box girder construction technology, and in particular to an assembly platform for cantilever blocks of ultra-high cross-section steel box girders. Background Technology

[0002] Steel box girders are a commonly used structural form for long-span bridges in current bridge construction. They are mostly constructed entirely by welding the top plate, bottom plate, web, diaphragms, and stiffening ribs, and cantilever arms are often installed on both sides. For steel box girders with smaller cross-sectional dimensions, the inverted assembly method is generally used in the factory for welding the blocks, making the assembly of the cantilever arms relatively simple. For steel box girders with ultra-high cross-sections, due to the impact of transportation and turning, a general assembly area is usually set up on the bridge site, and the upright assembly method is used for assembling the steel box girders.

[0003] Several common methods exist for installing ultra-high cross-section cantilever blocks. These include using scaffolding and modular couplings to erect an assembly platform, or using aerial work platforms for related work. Once the construction of the cantilever blocks for the steel box girder segments is completed, the assembly platform is dismantled and re-erected, or the aerial work platform is moved. Currently, erecting scaffolding assembly platforms requires frequent setup, dismantling, and relocation according to the construction progress of the cantilever blocks. This is time-consuming and labor-intensive, and the assembled platform is difficult to move as a whole, causing inconvenience for construction workers. Aerial work platforms have specific site requirements, and prolonged standing on them poses safety risks. Furthermore, the limited working space of aerial work platforms hinders smooth construction. Summary of the Invention

[0004] To address the aforementioned problems, this utility model aims to provide an assembly platform for cantilever blocks of ultra-high cross-section steel box girders, thereby resolving the issues existing in the prior art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A cantilever block assembly platform for ultra-high cross-section steel box girder, characterized in that it includes a crossbeam spanning above the top plate of the steel box girder, and the crossbeam is mounted on the top plate of the steel box girder through a longitudinal moving mechanism provided below it, so that the crossbeam can move longitudinally on the top plate of the steel box girder; L-shaped working platforms are fixedly connected to the lower ends of both ends of the crossbeam, so that the L-shaped working platforms are relatively distributed at both ends of the top of the steel box girder, and sufficient operating space for accommodating the cantilever block is reserved between the L-shaped working platforms and the side ends of the top plate of the steel box girder; the horizontal end of the L-shaped working platform is provided with a guide roller that can abut against the side wall of the steel box girder, and when the crossbeam moves longitudinally, it rolls into contact with the side wall of the steel box girder through the guide roller, thereby allowing the L-shaped working platform to move smoothly with the crossbeam.

[0006] Furthermore, the longitudinal moving mechanism includes a pair of vertically spaced columns fixed below the crossbeam, and a diagonal brace connecting the columns and the crossbeam. The bottom of the columns is equipped with a moving roller, and the moving roller makes rolling contact with the top plate of the steel box girder.

[0007] Furthermore, the L-shaped work platform consists of a vertical connecting frame and a horizontal platform, with the top of the vertical connecting frame fixedly connected to the bottom of the end of the crossbeam.

[0008] Preferably, the movable roller is a lockable omnidirectional wheel structure, and angle limiting plates are provided on the column and on both sides of the movable roller to limit the deflection angle of the movable roller.

[0009] Preferably, the vertical connecting frame is a ladder structure.

[0010] Preferably, a protective railing is provided around the horizontal platform.

[0011] The beneficial effects of this utility model are: the assembly platform can be built to fit the cross-sectional dimensions of the steel box girder, and can be adapted to the actual structural dimensions of the steel box girder during construction. It is made using simple tooling, making installation, use, and disassembly convenient. It is lightweight, rigid, safe, reliable, convenient, and cost-effective.

[0012] The assembly platform's dimensions and contours fit the cross-section of the steel box girder, requiring less construction space. At the same time, the assembly platform enhances safety through its climbing structure, construction safety basket, and guardrails, and has ample workpieces. Compared with the traditional use of aerial work platforms for cantilever block welding operations, it greatly reduces the risks of working at heights.

[0013] Moving rollers are installed under the crossbeams and columns of the assembly platform so that the assembly platform can move longitudinally along the steel box girder as construction progresses, greatly improving construction efficiency. At the same time, guide rollers are installed so that the assembly platform can move along a basically fixed longitudinal direction, improving the overall stability and safety of the structure, while avoiding interference with the assembly of the cantilever blocks after deflection.

[0014] The assembly platform can also simultaneously perform tasks such as cantilever block installation and welding, top plate and web plate welding, cantilever area weld painting, flaw detection, and grinding.

[0015] The assembly platform can also be equipped with rainproof and windproof covers and other functional components, which can largely ensure the welding quality. Attached Figure Description

[0016] Figure 1 This is a front view of the overall structure of this utility model.

[0017] Figure 2This is a top view of the structure of this utility model.

[0018] Figure 3 This is a schematic diagram of the L-shaped working platform structure of this utility model.

[0019] Figure 4 For this Figure 3 Left view.

[0020] Figure 5 This is a schematic diagram of the utility model in use.

[0021] Figure 6 This is a structural diagram illustrating an excessively large skew angle of the movable roller in this utility model.

[0022] Figure 7 This diagram illustrates how the angle of deflection is limited by angle limiting plates installed on both sides of the movable roller in this invention.

[0023] In the diagram: 11-Crossbeam; 12-Upper longitudinal beam; 13-Column; 14-Diagonal brace; 2-Moving roller; 3-L-shaped work platform; 31-Vertical connecting frame; 311-Ladder rod; 32-Horizontal platform; 321-Platform tie rod; 33-Platform diagonal brace; 4-Guide roller; 5-Angle limiting plate; a-Operating space; 6-Steel box girder; 61-Top plate; 62-Cantilever block. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solution of this utility model, the technical solution of this utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0025] See attached document Figures 1-7 The illustrated assembly platform for an ultra-high cross-section steel box girder cantilever block includes a crossbeam 11 spanning above the top plate 61 of the steel box girder 6. The crossbeam 11 is mounted on the top plate 61 of the steel box girder 6 via a longitudinal moving mechanism located below it, allowing the crossbeam 11 to move longitudinally on the top plate 61 of the steel box girder 6. Specifically, as shown... Figure 1-2 As shown, the crossbeams 11 are arranged along the longitudinal spacing of the steel box girder 6, and adjacent crossbeams 11 are connected by upper longitudinal beams 12 along the transverse spacing, together forming a planar structure of crossbeams 11, which improves the overall strength of the crossbeam 11. The crossbeams 11 and upper longitudinal beams 12 are preferably made of I-beams, and the columns 13 are made of angle steel, which have sufficient strength to ensure that the assembly platform will not deform during construction.

[0026] like Figure 1 , 5As shown, L-shaped working platforms 3 are fixedly connected to the lower ends of both ends of the crossbeam 11. The crossbeam 11 causes the L-shaped working platforms 3 to be relatively distributed at both ends of the top of the steel box girder 6. Sufficient operating space 'a' is reserved between the L-shaped working platforms 3 and the side ends of the top plate 61 of the steel box girder 6 to accommodate the cantilever blocks 62. Workers can construct the cantilever blocks 62 on both sides of the top plate 61 of the steel box girder 6 within this operating space 'a'. The longitudinal movement mechanism drives the crossbeam 11 to move longitudinally on the top plate 61 of the steel box girder 6, simultaneously moving the L-shaped working platforms 3, enabling continuous construction of the cantilever blocks 62 along the longitudinal direction of the steel box girder 6.

[0027] like Figure 1 , 5 As shown, the horizontal end of the L-shaped working platform 3 is equipped with a guide roller 4 that can abut against the side wall of the steel box girder 6. When the crossbeam 11 moves longitudinally, the guide roller 4 rolls into contact with the side wall of the steel box girder 6, thereby enabling the L-shaped working platform 3 to move smoothly with the crossbeam 11. This achieves the lateral guiding effect during the longitudinal movement of the crossbeam 11 and avoids the problem of the L-shaped platform being obstructed after contacting the side wall of the steel box girder 6 due to left and right deviation during longitudinal movement.

[0028] Specifically, such as Figure 1 , 5 As shown, the longitudinal moving mechanism includes a pair of vertically spaced columns 13 fixed below the crossbeam 11, and diagonal braces 14 connecting the columns 13 and the crossbeam 11. The bottom of each column 13 is equipped with a moving roller 2, which rolls in contact with the top plate 61 of the steel box girder 6. This longitudinal moving structure supports the crossbeam 11 and the L-shaped working platform 3 on the top plate 61 of the steel box girder 6. The moving rollers 2 drive the crossbeam 11 and the L-shaped working platform 3 to move longitudinally on the top plate 61 of the steel box girder 6. Workers can perform continuous construction operations on the cantilever block 62 within the L-shaped working platform 3. Compared to currently used scaffolding, this eliminates the need for frequent erection, dismantling, and relocation processes, improving work efficiency and safety.

[0029] Preferably, the movable roller 2 is a lockable omnidirectional wheel structure. When deflection occurs during movement, the rotation structure of the omnidirectional wheel can adjust the rolling direction in real time, solving the problem of movement jamming. The movable roller 2 of the omnidirectional wheel structure also has a locking structure, which locks the movable roller 2 after it is moved to the construction position to prevent rolling during construction and affecting the construction operation.

[0030] like Figure 6 As shown, because the caster wheel has a free rotation structure in the entire circumference, it is difficult for the moving roller 2 to roll longitudinally after rotating to the lateral rolling direction. Therefore, to solve this problem, as... Figure 7As shown, preferably, an angle limiting plate 5 is provided on each of the columns 13 and on both sides of the movable roller 2, thereby limiting the deflection angle of the movable roller 2. After the movable roller 2 deflects, it can contact the angle limiting plate 5, thus limiting the further deflection of the movable roller 2 and avoiding the problem of difficulty in longitudinal movement after rotating to the lateral position. The limited deflection angle is preferably ≤30°.

[0031] like Figure 1-5 As shown, the L-shaped work platform 3 consists of a vertical connecting frame 31 and a horizontal platform 32, with the top of the vertical connecting frame 31 fixedly connected to the lower end of the crossbeam 11. Preferably, a platform brace 33 is provided between the vertical connecting frame 31 and the horizontal platform 32 to improve the overall strength of the L-shaped work platform 3, as well as the stability of operators, construction equipment, and materials placed on the horizontal platform 32.

[0032] Since the construction of the ultra-high cross-section steel box girder 6 involves high-altitude operations during the construction of the cantilever block 62, it is preferable that the vertical frame is a ladder structure with spaced ladder rods 311 to facilitate the movement of operators to the horizontal platform 32. Operators can quickly move to the horizontal platform 32 via the surface of the top plate 61 and the vertical connecting frame 31 of the ladder structure. Simultaneously, the horizontal platform 32 is a planar structure with a flat plate (not shown in the figure) on the upper surface and a tie-rod frame structure at the bottom. Platform tie rods 321 connect the flat plate and the bottom tie-rod frame structure, facilitating the standing and movement of operators and ensuring construction safety, thus avoiding safety hazards such as falling construction materials during movement and construction on the frame structure of the horizontal platform 32.

[0033] To improve the safety of construction operations, guardrails (not shown in the figure) are installed around the horizontal platform 32. The installation of guardrails effectively ensures the safety of operators during relocation.

[0034] The principle of this invention is as follows: The assembly platform is manufactured on the ground according to the dimensions of the steel box girder 6, then hoisted to the top of the steel box girder 6 and lowered down, so that the moving rollers 2 contact the surface of the top plate 61. The L-shaped working platforms 3 and guide rollers 4 on both sides are located close to the side walls of the steel box girder 6. Then, the operators can be safely transferred from the vertical connecting frame 31 of the top plate 61 to the construction protection basket on the horizontal platform 32 for safe construction. As the cantilever block 62 is gradually assembled, the assembly platform can be moved synchronously by the moving rollers 2. After it is moved into place, the moving rollers 2 can be locked. When the construction is completed, the assembly platform is hoisted and detached from the side of the steel box girder 6 for disassembly.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Various changes and modifications may be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A super-high cross-section steel box girder cantilever block assembly platform, characterized in that, The system includes a crossbeam spanning the top plate of a steel box girder, which is mounted on the top plate via a longitudinal moving mechanism located beneath it, allowing the crossbeam to move longitudinally on the top plate. L-shaped working platforms are fixedly connected to the lower ends of the crossbeam, positioned opposite each other at the top of the steel box girder. Sufficient operating space is reserved between the L-shaped working platforms and the side ends of the top plate to accommodate the cantilever blocks. The horizontal ends of the L-shaped working platforms are equipped with guide rollers that abut against the side walls of the steel box girder. When the crossbeam moves longitudinally, these guide rollers roll into contact with the side walls of the steel box girder, allowing the L-shaped working platforms to move smoothly along with the crossbeam.

2. The assembly platform of claim 1, wherein: The longitudinal moving mechanism includes a pair of vertically spaced columns fixed below the crossbeam, and a diagonal brace connecting the columns and the crossbeam. The bottom of the columns is equipped with a moving roller, and the moving roller makes rolling contact with the top plate of the steel box girder.

3. The assembly platform of claim 1, wherein: The L-shaped work platform consists of a vertical connecting frame and a horizontal platform, with the top of the vertical connecting frame fixedly connected to the bottom of the end of the crossbeam.

4. The assembly platform of claim 2, wherein: The movable roller is a lockable omnidirectional wheel structure, and angle limiting plates are provided on the column and on both sides of the movable roller to limit the deflection angle of the movable roller.

5. The assembly platform of claim 3, wherein: The vertical connecting frame is a ladder structure.

6. The assembly platform of claim 3, wherein: A protective railing is installed around the horizontal platform.

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