Self-supporting deformed steel-encased concrete composite beam

Abstract

The invention discloses a self-supporting deformed steel-encased concrete composite beam which comprises a deformed thin-wall steel section, full-length reinforcement cages and concrete filler. The deformed thin-wall steel section comprises a lower bottom plate, webs on two sides of the lower bottom plate, and upper flanges at the upper ends of the webs. Each web is provided with a concave. The two webs, the lower bottom plate and the upper flanges enclose a deformed containing cavity. The upper end of the deformed containing cavity is provided with an opening in the thickness range of a floor covering. The full-length reinforcement cages are distributed in the deformed containing cavity and fixed on the lower bottom plate of the deformed thin-wall steel section. The concrete filler is integrally poured into an opening at the upper end of the deformed thin-wall steel section, the inner deformed containing cavity, the full-length reinforcement cages and the floor covering, so that structural bearing capacity, rigidity, cracking resistance and construction performance are increased evidently, no external concrete formwork is needed during construction, and labor reduction, construction period shortening and auxiliaries economization can be achieved.

Description

technical field [0001] The invention relates to the technology in the field of civil engineering, in particular to a self-supporting special-shaped outsourcing steel-concrete composite beam structure. Background technique [0002] Outer-clad steel-concrete composite beam is a bending member composed of steel (steel pipe, hot-rolled steel, etc.) filled with concrete and reinforced concrete floor, which can give full play to the advantages of steel in tension and concrete in compression. a basic component of . The known outsourcing steel-concrete composite beam is a member with a rectangular cross-section. This kind of rectangular cross-section member is commonly used in practical engineering because of its high section bending stiffness and regular shape. However, due to the large rectangular cross-sectional area, when the beam is bent, the stress on the concrete near the neutral axis is small, resulting in a large beam and waste of materials. For reinforced concrete rectan...

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Problems solved by technology

However, due to the large area of ​​the rectangular cross-section, when the beam is bent, the stress on the concrete near the neutral axis is small, resulting in the weight of the beam and the waste of materials

For reinforced concrete rectangular beams, external formwork must be placed during construction, and when the formwork rigidity is insufficient, auxiliary support systems such as scaffolding have to be erected. After the newly poured concrete has been cured for a certain period, the auxiliary support system and The formwork structure requires a lot of manpower, construction period and auxiliary materials, etc.

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