Beam-arch combined bridge stress system conversion design, construction method and construction device

Abstract

The invention discloses a beam-arch combination bridge stress system conversion design, a construction method and a construction device, which are applied to the technical field of beam-arch combination bridges, and comprise the following steps: S1, establishing a finite element model of a beam-arch combination bridge, and determining a tension sequence of each suspender; s2, after one batch or a plurality of batches of suspenders are pulled each piece, concrete beam prestressing tendons for tie bars are subjected to linkage tensioning, and the tensioning force of each time is determined; s3, after tensioning is finished, the tie bars are fixed in the main beams through concrete beam prestressing tendons; according to the construction method, actual tensioning construction is carried out according to the steps, and the tie bars are fixed to the main beams through concrete beam prestressing tendons after actual tensioning construction is completed; the construction device comprises concrete beam prestressing tendons for tie bars and embedded pipes, wherein the concrete beam prestressing tendons and the embedded pipes are arranged in a main beam. According to the method, the prestress provided in the tensioning construction stage can be kept in the bridge, permanent use of temporary facilities is achieved, better safety storage of stress in the construction stage is achieved, the stress condition of the main beam is clear, and unknown risks in complex bridge construction can be more effectively resisted.

Description

technical field [0001] The invention relates to the technical field of girder-arch composite bridges, in particular to a conversion design, construction method and construction device of the stress system of a beam-arch composite bridge. Background technique [0002] Concrete continuous beam-arch composite bridges or concrete continuous rigid frame-arch composite bridges can be classified as beam-arch composite bridges. The main arch is generally a steel structure, and the construction method of beam first and then arch is usually adopted. The construction process is as follows: figure 1 shown. Compared with the common concrete continuous beam or concrete continuous rigid frame bridge, the structural type of this type of bridge has significantly improved vertical stiffness. Span concrete bridge. [0003] However, the application of this type of bridge in actual engineering is relatively seldom, the main reason is that the conversion of its structural force system is not cl...

AI Technical Summary

Problems solved by technology

[0006] The existing technology fails to effectively solve the above-mentioned problems. The evaluation of the positive and negative effects of this type of bridge is not clear, it is difficult to guide the design intuitively, and it is difficult to form a systematic design method. Instead, it can only be based on similar project experience and continuous modification. try to complete the design

In addition, the existing technology mainly focuses on the initial tension of the suspenders and the force of the bridge suspenders. In actual construction, due to the distribution of force between the beam and the arch after the suspenders are stretched, different tensioning sequences will also produce different main forces. The short-term stress state of the beam during the construction stage has not been studied in the prior art, resulting in a low stress safety reserve in the short-term state during the construction stage and a weak ability to resist unknown risks. The amount of stress beam configuration leads to low economic efficiency of the bridge, so it is difficult to promote the application of this type of bridge on a large scale.

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