Open-web continuous beam bridge V-brace section and a construction method adapting to a soft soil foundation area

Abstract

The invention discloses an open-web continuous beam bridge V-brace section and a construction method adapting to a soft soil foundation area. The open-web continuous beam bridge V-brace section comprises a lower chord beam, an upper chord beam and an upper and lower chord convergence section. The lower chord beam comprises a root beam at the support and a V-shaped lower chord which is symmetrical to the root beam at the support; the two ends of the two V-shaped lower chord members are connected with a first batch of pouring sections of the upper and lower chord member converging section beam on the outer side; an upper chord beam is arranged between the second batch of pouring sections of the two upper and lower chord convergence section beams, and the corresponding second batch of pouring sections are connected through the upper chord beam; and a third batch of pouring sections are arranged at the positions, corresponding to the outer sides of the two ends of the corresponding upper chord beam, of each outer side upper and lower chord convergence section beam. During construction, the lower chord beam and the first batch of pouring sections are firstly poured, then the upper chord beam and the second batch of pouring sections are poured, and finally the third batch of pouring sections are poured. The structure permeability and the tensile property of the top area of the root beam at the lower chord support are remarkably improved, the landscape effect is improved, the problem of stress concentration is solved, and the construction period and cost are reduced.

Description

technical field [0001] The invention relates to the technical field of bridge construction, in particular to a V-brace segment of an empty-bellied continuous girder bridge and a construction method adapted to soft soil foundation areas. Background technique [0002] The fasting continuous girder bridge system improves the root height of the traditional continuous box girder support and hollows out the corresponding box girder web to form a separation between the upper and lower chords of the fasting section and reduce its own weight. It is essentially different from the traditional box girder. The difference between them makes the root area form a more reasonable beam-arch combination stress mechanism. [0003] The height of the pier body is reduced through the setting of V braces, and the structural rigidity is increased. At the same time, the stressed span of the box girders other than V braces is shortened, thereby expanding the spanning capacity of traditional continuous...

AI Technical Summary

Problems solved by technology

[0020] When the V-bracing structure is located in the soft soil foundation area, if the full support construction method is adopted, since the lower chord needs to be constructed first, and then the upper chord is erected on the lower chord, it is easy to Due to the weak reinforcement of the foundation below the confluence section of the lower chord and the upper and lower chords, when the concrete is poured later on the upper chord and the confluence section of the upper and lower chords, the support structure under the formwork of the lower chord and the confluence of the upper and lower chords will undergo elastic-plastic deformation and Settlement has adverse effects on the root beam at the bottom chord support that has been poured in the early stage. Generally, the bottom chord must be provided with temporary tie rods during construction. The construction process is complicated and the cost of the measures is high

[0021]However, if the method of hanging basket plus support or the method of support and buckle cable is used for construction, the overall construction period will be longer, the construction process will be complicated, and the project cost and construction temporary measures will be charged higher

[0022] Therefore, how to overcome the defects of poor landscape effect, complex structure and stress of the existing V-brace structure, improve the final mechanical performance and durability of the structure, and simplify the construction operation Technology to increase economic benefits has become an urgent technical problem to be solved by those skilled in the art

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