Construction method of steel-concrete joint section

Abstract

The invention provides a construction method of a steel-concrete joint section, which relates to the field of bridge construction and is carried out according to the following steps: 1) manufacturingand hoisting of the steel-concrete joint section; 2) splice that steel-concrete joint section with the precast ordinary concrete structure or installing the cast-in-situ concrete structure formwork; 3) pour the ultra high performance concrete of the steel-concrete joint section; 4) curing the ultra high performance concrete of the steel-concrete joint section. The invention is fast, convenient, reliable, suitable for the construction of the long-span mixed bridge, greatly shortens the construction period and improves the construction quality.

Description

technical field [0001] The invention relates to the field of bridge construction, in particular to a construction method for a steel-concrete joint section. Background technique [0002] With the continuous development of bridges, hybrid bridges that combine steel structures and concrete structures avoid problems such as poor concrete tensile properties and steel buckling and fatigue due to making full use of the compressive properties of concrete and the tensile properties of steel. , has gradually become the current development trend of bridge engineering. As the transition section between the steel structure and the concrete structure, the steel-concrete joint section is a key component of the long-span hybrid bridge. It is not only required to transmit various internal forces between the steel structure and the concrete structure reliably and smoothly, but also to The shape of the two parts should be coordinated to avoid sudden changes in structural rigidity and strengt...

AI Technical Summary

Problems solved by technology

[0004] 1. The structure of the steel-concrete combination section is complex, the PBL shear key aperture is small, and the concrete pouring space in the steel grid room is relatively narrow, which is inconvenient for vibrating construction; the working performance of ordinary concrete is generally difficult to ensure dense pouring, and the large particle size of coarse aggregate is difficult The perforated plate passing through the PBL shear key, the perfusion quality is difficult to guarantee

[0005] 2. As the transitional section between the steel structure and the concrete structure, the steel-concrete joint section has a large difference in quality and rigidity of the structures on both sides. Therefore, the steel-concrete joint section should avoid sudden changes in stiffness and strength, and should have no less than The static and fatigue properties of the structures on both sides; while ordinary concrete has general mechanical properties, poor toughness, and insufficient fatigue resistance, it is difficult to ensure the mechanical matching between the steel structure and the concrete structure

[0006] 3. Due to the poor volume stability of ordinary concrete, the drying shrinkage is large and the bonding strength with the steel plate is not high. The roof of the combined section cell and the concrete are prone to voids, and the upper rainwater penetrates into the cell through the cracks in the pavement layer. Seriously affect the durability of the joint section, and even endanger the structural force, which is not conducive to the play of the shear resistance of the PBL shear key

This invention is divided into multiple concrete pouring, which takes a long time, has cumbersome steps, high construction cost, and the ordinary concrete pouring has poor durability, is difficult to pour densely, and has poor work performance

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