Construction method of steel-concrete combined section of long-span cable-stayed bridge

Abstract

The invention creatively provides a construction method of a steel-concrete combined section of a long-span cable-stayed bridge. The construction method includes the steps that firstly, longitudinal prestressed tendons of concrete beams are installed, and fine-adjusted concrete beam sections are put in place; then a plurality of pouring holes are formed in steel beams, fine-adjusted steel box girders are put in place, and the steel beams and the concrete beams are in butt joint and locked temporarily; then steel geocell concrete of a bottom plate, a web, steel geocell concrete of an inclined web and steel geocell concrete of an outer web are poured; and then steel geocell concrete of a roof is poured. According to the construction method of the steel-concrete combined section of the long-span cable-stayed bridge, concrete is poured directly through a discharging hopper, the impact load on a support system during concrete conveying through a pump is avoided, shaking is relieved, the structural stress condition of the junction of the steel-concrete combined section is improved, strict vibration is not required during pouring, construction is convenient, the effect after curing is good, the concrete pouring quality is excellent, the safety risk in the construction process is lowered, and the construction progress is accelerated.

Description

technical field [0001] The invention belongs to the technical field of bridge construction, and in particular relates to a construction method for a steel-concrete joint section of a long-span cable-stayed bridge. Background technique [0002] With the rapid development of my country's society, economy, science and technology, infrastructure construction tasks are gradually increasing, and the technical requirements for bridge construction are also increasing accordingly. How to construct quickly and safely to ensure the design purpose is becoming an important task in the field of bridge construction. In bridge construction, in order to use larger main spans, steel box girders are often used as the structural form of main girders, and concrete beams are mostly used for side spans in order to control construction investment and structural design requirements, and steel-concrete combined sections are As the transitional section of the two structures, the construction quality ...

AI Technical Summary

Problems solved by technology

Because the physical properties of concrete and steel are very different, it brings great difficulties to the construction of the steel-concrete joint section

In the past, ordinary high-strength concrete was poured into the steel box girder in the construction of the steel-concrete joint section, which required strict vibration and compaction, complicated construction, small structural space at the joint, difficulty in using construction machines, poor vibration effect, and easy to cause defects. It will have an adverse effect on the service life of the bridge

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