Removable long-span thin car frame

Abstract

The invention provides a removable long-span thin car frame which is provided with removable car bodies (20) at both sides and a large span-height ratio external prestress steel girder structure, wherein the large span-height ratio external prestress steel girder structure is arranged between the car bodies at both sides; the steel girder structure (21) is arranged between a pair of car bodies (20) and comprises a plurality of main girders (1) arranged in parallel; one end of each main girder is fixedly connected with one of the car bodies, and the other end of each main girder is connected with the other car body in a floating way; and the position at the lower part of each main girder (1) is provided with a prestress stretching cable (17). When the main girders generate larger deformation by a heavy load, the car frame allows the main girders to generate proper horizontal displacement relative to the car bodies, thereby releasing great horizontal tensile force, greatly reducing wheel pressure and eliminating a horizontal additional load of the main girders on the car bodies at both sides of the car frame with the heavy load and large deflection.

Description

technical field [0001] The invention relates to a mobile platform, in particular to a large-span mobile platform capable of bearing heavy loads. Background technique [0002] In large-scale sports games or large-scale outdoor performances, in order to ensure that the audience in the front row of the stadium or performance venue can get a better viewing effect on the stage ground, the overall elevation of the stage used for the performance must be as low as possible, especially for installation on lifting platforms. Raising and receiving the underground car platform, limiting its own height plays a decisive role in reducing the overall elevation of the stage. [0003] Such a platform includes driving trolleys on both sides and a steel beam structure placed between the trolleys. A large-span steel beam structure is required to support the platform cover. The span and height of a conventional steel beam structure In a certain proportion, the larger the span is, the higher the ...

AI Technical Summary

Problems solved by technology

[0003] Such a platform includes driving trolleys on both sides and a steel beam structure placed between the trolleys. A large-span steel beam structure is required to support the platform cover. The span and height of a conventional steel beam structure In a certain proportion, the larger the span, the higher the height should be correspondingly, so it forms a contradiction with the requirement of reducing the elevation of the above-mentioned platform as much as possible

[0004] In addition, for a large-span trolley, when it bears a heavy load, the steel beam structure will form a significant bending deformation with a low center and high ends, and a local bending moment will be generated at the connection between the two ends of the load-bearing steel beam structure and the driving trolley body , the load cannot be evenly distributed to all the supporting wheels of the driving trolley, which not only leads to excessive wheel pressure and accelerated wear of the single wheel during the operation of the trolley, but also causes the lateral horizontal additional force of the trolley under the heavy load and large deflection of the steel beam structure. The technical problem that the load is difficult to balance

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