Walking type jacking construction method and device for large-span reinforced concrete combined beams

Abstract

The invention provides a walking type jacking construction method and device for large-span reinforced concrete combined beams. The walking type jacking construction method comprises the following steps that temporary piers are arranged between all main piers of a bridge girder; a jacking device and two bearing beams are installed on each temporary pier, wherein each jacking device is arranged between the corresponding two bearing beams; the reinforced concrete combined beams are arranged on the bearing beams of the temporary piers; the jacking devices carry out upward jacking in place and make contact with the bottoms of the reinforced concrete combined beams; the jacking devices continue to carry out upward jacking, jack the reinforced concrete combined beams and break away from the bearing beams; the jacking devices are pushed forward and drive the reinforced concrete combined beams to move forward by a set stroke; the jacking devices descend so that the reinforced concrete combined beams can be arranged on the bearing beams of the temporary piers in a supporting mode again; the jacking devices continue to descend to the initial positions and are pushed backwards to the initial positions, so that a jacking stroke is finished; the above steps are conducted repeatedly until construction of the whole bridge girder is completed. According to the walking type jacking construction method and device for the large-span reinforced concrete combined beams, manpower, material resources and financial resources are saved on the premise of guaranteeing the construction period; meanwhile, the walking type jacking construction method and device for the large-span reinforced concrete combined beams have the advantages that construction and operation are convenient, safety and reliability are realized, efficiency is high, the construction period is short, and the comprehensive cost is low.

Description

technical field [0001] The invention relates to the technical field of bridge engineering, in particular to a walking-type jacking construction method and device for large-span steel-concrete beams, steel box girders, or reinforced concrete beams in the construction fields of bridges spanning railways, highways, and rivers. Background technique [0002] With the development of the bridge industry, various construction methods have emerged one after another. The construction methods must adapt to the structural characteristics of the bridge itself and the specific construction environment, and the specific construction environment and construction conditions also promote the emergence of new construction methods. At present, the more commonly used jacking process in domestic bridge construction is the dragging multi-point continuous jacking method. This method is mature in technology, low in construction cost, and does not require high equipment. [0003] The idea of ​​the ja...

AI Technical Summary

Problems solved by technology

[0007] Drag-type jacking will generate a large horizontal force at the pier top position between the temporary pier and the main pier, which requires high rigidity for the temporary pier, and may cause cracks in the root concrete of the main pier, which cannot be repaired

[0008] ②. The structure of the top of the temporary pier is complex

[0009] The structure of the pull-type jacking temporary pier pier is very complicated, and the stability is poor, especially the stability of the vertical adjustment jack. Danger

[0010] Therefore, during the construction of this process, there is a large horizontal thrust on the pier body, and it is difficult to set up the lateral limit device, and the effect is difficult to guarantee; at the same time, this method requires a lot of manpower to feed each steel slideway. The slider has a long construction period and low construction efficiency, so it is necessary to improve the previous push construction method to meet the requirements of the project

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