Bearing-fireproof integrated prefabricated prestressed steel-concrete combined secondary beam and manufacturing method thereof

Abstract

The invention belongs to the field of constructional engineering, and particularly relates to a bearing-fireproof integrated prefabricated prestressed steel-concrete combined secondary beam and a manufacturing method. The combined secondary beam comprises a middle section steel assembly, a pre-tensioned prestressed concrete strip and a concrete assembly, wherein the pre-tensioned prestressed concrete strip and the concrete assembly are located at the bottom end of the middle section steel assembly. The pre-tensioned prestressed concrete strip and the middle section steel assembly extend in the same direction; a foam concrete fireproof thin plate is arranged between an upper flange and a lower flange of the H-shaped steel; the upper flange of the H-shaped steel is mounted with the concrete component through the upper flange stud connecting piece; the reinforcing stirrups are connected with the upper flange stud connecting pieces in a welded mode, and the upper flange portions, facing the H-shaped steel, of the reinforcing stirrups are provided with secondary beam longitudinal bars arranged orthogonally with the reinforcing stirrups. And the cast-in-place concrete is poured on an upper flange of the H-shaped Pre-tensioning prestress is utilized, concrete on the two sides of the H-shaped steel web is omitted, the large-span and light-weight prefabricated prestress secondary beam is formed, the material strength can be brought into play, the field hoisting efficiency is improved, and the construction cost is reduced.

Description

technical field [0001] The invention belongs to the field of construction engineering, and particularly relates to a load-bearing-fireproof integrated prefabricated prestressed steel-concrete composite secondary beam and a manufacturing method. Background technique [0002] With the development of society and economy, the requirements for building functions are getting higher and higher, and the structural form has also changed from ordinary reinforced concrete to prestressed concrete and steel reinforced concrete. The profiled steel concrete structure is a composite structure in which profiled steel is arranged in the concrete member, and a small amount of steel bars are arranged to work together. Compared with ordinary concrete structures, shaped steel concrete has higher bearing capacity and stiffness, and has excellent ductility and energy dissipation capacity; Rust and fire protection. Due to the integration of the dual advantages of concrete and steel structure, st...

AI Technical Summary

Problems solved by technology

However, the existing technology is to arrange the steel strands between the upper and lower flanges of the section steel, which is not conducive to the arrangement of the ribs, and the post-tensioning method is used in the on-site construction, but the secondary beam cannot be tensioned on-site

Long-span secondary beams lack effective structural forms, which limits the process of building industrialization

[0004] In the conventional assembled monolithic concrete structure, the prefabricated laminated floor often needs two or four sides to protrude from the bottom bar. The ring stirrups of the beam interfere with each other, the hoisting speed is low, and the main reinforcement of the secondary beam needs to be penetrated later, the installation efficiency is low and the cost is high

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