A method for on-site horizontal assembly of steel pipe arches

Abstract

The invention discloses an on-site horizontal splicing method of a steel tube arch, which adopts horizontal splicing in the form of '3+1' to meet the requirements of the alignment and can be processedand manufactured normally. The method adopts a mode of drawing a ground sample and then hanging a vertical line to lead the wire to be centered and aligned, is convenient and practical, and ensures horizontal splicing precision and linear smoothness. An inner flange is adopted to connect the two arch rib sections, the connection precision is high, the adjusting speed is high when a steel beam iserected in the later period, and the safety of the inner flange is high. The arrangement of a pre-arch degree is considered during horizontal splicing, so that the problem that the linear change caused by the pre-arch degree in the erection process cannot accurately align an inner flange bolt is avoided, and unnecessary trouble is caused. The on-site horizontal splicing method of the steel tube arch adopts the mode of steel component processing and on-site assembly separation, and is convenient for management and error prevention by batch entry and batch acceptance. The middle part is welded first, and then the two sides are welded to prevent stress concentration. After the arch rib is welded, welding the inner flange and the arch rib which are connected by bolts in advance; the deformation caused by the shrinkage of a welding seam cannot be prevented so that the inner flange cannot be accurately aligned.

Description

technical field [0001] The invention relates to a method for on-site lying assembly of steel pipe arches. Background technique [0002] Now it is necessary to carry out on-site horizontal joint construction of the 220m span steel pipe arch. Under the existing technical conditions, the horizontal joint linear control accuracy of the arch curve is poor, and the welding deformation is large. Cranes are often used for auxiliary construction. The construction efficiency is low and the safety is low. Risky. On-site steel components are complex and diverse, and difficult to manage. The manufactured steel arch ribs have not been pre-cambered and pre-assembled, resulting in a large difference between the control points of the arch ribs and the manufacturing control points during the on-site installation process, and the precise alignment cannot be achieved. Moreover, when the butt welding technology is used between the arch rib segments, the installation is difficult and the risk o...

AI Technical Summary

Problems solved by technology

[0002] Now it is necessary to carry out on-site horizontal jointing of the 220m-span steel pipe arch. Under the existing technical conditions, the linear control accuracy of the horizontal jointing of the arch curve is poor, and the welding deformation is large. Cranes are often used for auxiliary construction. The construction efficiency is low and the safety is low. high risk

On-site steel components are complex and diverse, making it difficult to manage

Manufactured steel arch ribs have not been pre-cambered and pre-assembled, resulting in a large difference between the control points of the arch ribs and the manufacturing control points during the on-site installation process, and the precise alignment cannot be achieved

In addition, when the butt welding technology is used between the arch rib segments, the installation is difficult and the risk of high-altitude alignment is high

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