Large-span roof steel truss structure and accumulative slipping construction technology

Abstract

The invention discloses a large-span roof steel truss structure and an accumulative slipping construction technology. A single arch truss is spliced by three sections of trusses, and a steel pulling cable is arranged at the bottom chord of the arch truss; with the adoption of support jig frames, multiple sections of large-span trusses are subjected to sectioned hoisting and airborne assembling; with the adoption of the mode that long guide rails are arranged on parapet walls and short guide rails arranged on the support jig frames, a multi-point advancing scheme of arranging slipping equipment at multiple points is implemented; by means of addition of bracket slipping shoes, a working plane where the trusses are located is separated from a working plane of guide rail slipping, so that the problem of construction difficulty of mounting the steel pulling cable firstly and slipping the trusses later is solved, the mounting method of the airborne assembling of the multiple sections of large-span trusses and overall slipping of the multiple trusses is realized, and the structure and the construction technology have the advantages that the construction cost is reduced, the construction efficiency is improved and the construction is safe and reliable.

Description

technical field [0001] The invention relates to the manufacture and installation of a large-span truss in the technical field of steel structure manufacture and building installation, in particular to a structure of a large-span roof steel truss and a construction process for accumulative slippage. Background technique [0002] With the construction and development of large-scale construction venues, higher requirements are put forward for the manufacture and installation of long-span trusses. The current long-span trusses are divided into two types: overall manufacturing and hoisting and segmental manufacturing and high-altitude assembly. The problem is that the former , Restricted by transportation, construction site and hoisting equipment, the development of long-span trusses has been severely restricted. For the latter, the installation project is complicated, and a large number of high-altitude scaffolds need to be erected. Not only the high-altitude assembly and weldin...

AI Technical Summary

Problems solved by technology

[0002] With the construction and development of large-scale construction venues, higher requirements are put forward for the manufacture and installation of long-span trusses. The current long-span trusses are divided into two types: overall manufacturing and hoisting and segmental manufacturing and high-altitude assembly. The problem is that the former , restricted by transportation, construction site and hoisting equipment, has caused serious constraints to the development of long-span trusses

For the latter, the installation project is complicated, and a large number of high-altitude scaffolds need to be erected. Not only the high-altitude assembly and welding workload is huge, but also there are greater quality and safety risks, the construction is more difficult, and there will be a great impact on the construction period of the entire project. impact, the technical and economic indicators of the scheme are poor

[0003] The prior art (CN104929373A) discloses [construction scheme of long-span square steel pipe truss and its accumulative slippage]. The existing problems are, ①, the problem that the entire span truss cannot be transported, and the problem that it cannot be lifted due to the constraints of the construction site and lifting equipment ; ②, if the sliding guide rail is installed between the corbels of the structural columns, effective guide rail support measures must be taken, that is, a support frame is set up between all structural columns, resulting in additional supporting man-hours and costs; ③, the truss The overlapping of the working surface where the guide rail slides will inevitably affect the work efficiency during the positioning and adjustment of the truss and the disassembly of the guide rail, resulting in greater safety risks for workers when working at high altitude near the edge. ④、 Especially for trusses with multi-section lower chord steel cables, the installation of steel cables cannot be followed up before the truss is installed and slipped into place, resulting in the second unloading condition of the truss; and for trusses without supporting rods and steel cables , the relative stability of the stress system of the truss itself is poor, not only it is difficult to control the strain of the truss itself, but also there is a risk of instability of the truss during the sliding construction process

Images