Large-span steel box arch rib segmented assembling and integral lifting construction method

Abstract

The invention discloses a large-span steel box arch rib segmented assembling and integral lifting construction method. The method comprises the following steps that S1, a side arch section support system, a middle arch section support system and a gate-type integral lifting support are erected, a passage channel is reserved between supporting supports of the middle arch section support system, andthe gate-type integral lifting support is located at two ends of the design position of a middle arch section arch rib; S2, arch ribs of the side arch sections are installed at the designed bridge positions; S3, middle arch section arch ribs are located below the designed bridge location, and the middle arch section arch ribs and the middle arch section support system are assembled into a whole;and S4, middle arch section arch rib hoisting construction is carried out. The method is advantaged in that normal passage of a channel is guaranteed, welding quality control difficulty is lowered, and in-place precision of the arch rib sections is guaranteed.

Description

technical field [0001] The invention relates to the technical field of bridge construction, in particular to a construction method for segmentally assembling and overall lifting of large-span steel box arch ribs. Background technique [0002] At present, the main construction methods of steel arch bridges at home and abroad are: bracket method, cable hoisting method, swivel method, cantilever assembly method, arch crane assembly method, and arch rib large section overall lifting method. The bracket method is usually to erect a full-scale bracket or a separate bracket when the terrain and foundation conditions under the bridge are good. After the bracket is assembled, the construction method of assembling and welding the bracket on the bracket is the bracket method. The advantage of this method is that no large-scale hoisting equipment is required and the transverse bracing is easy to install. The disadvantage is that there are many arch rib joints, a large welding workload, ...

AI Technical Summary

Problems solved by technology

The advantage of this method is that no large-scale hoisting equipment is required and the transverse bracing is easy to install. The disadvantage is that there are many arch rib joints, a large welding workload, and a long construction period. It is flexible and does not affect the navigation, and the construction is more convenient. It is widely used in the construction of arch bridges.

[0003] The main arch rib of Liuzhou Guantang Bridge has a clear height of 100m and a clear span of 450m. There are 58 arch rib segments in the whole bridge, with a maximum weight of 304.1t. structure, there are problems such as high difficulty in hoisting arch rib segments, and relatively difficult alignment and closing of closing segments. If the bracket method is adopted, due to the high net height of the arch ribs, there will be problems such as long assembly time and heavy welding workload. And it takes a long period of time for the waterway. If cable hoisting is used, the problems of limited hoisting capacity and high risk of high-altitude operations must also be considered

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