Limited self-restricting reinforced concrete slab member in bending and manufacturing method thereof

Abstract

The invention discloses a bent component for limited self-restraining steel bar concrete plate, which includes the concrete (1) and a plurality of stressed cold rolled and twisted steel bars (2) arranged in the concrete and with spiral cross sections, and a plurality of distribution steel bars (3) which are connected and spread vertically to the stressed cold rolled and twisted steel bars (2); the stressed cold rolled and twisted steel bars (2) are deployed in pairs; the spiral rotation angles of the two stressed cold rolled and twisted steel bars (2) in every pair are the same, but the spiral rotation directions are to the opposite. The making method includes making of the stressed cold rolled and twisted steel bars (2) and the distribution steel bars (3), making of installation templates, installing and binding of the stressed cold rolled and twisted steel bars (2) and the distribution steel bars (3), casting of the concrete, maintenance and mould removal of the cast steel bar concrete structure. The component can form the self-restraining concrete, to improve the structure rigidity and control the crack width, and so that the making technology becomes convenient.

Description

technical field [0001] The invention relates to a concrete member such as a floor panel and a roof panel for civil buildings and a manufacturing method thereof, in particular to a limited self-constrained reinforced concrete slab bending member and a manufacturing method thereof. Background technique [0002] In the field of civil engineering, concrete structures have the advantages of economy, simplicity, practicality, and easy access to materials, and are still widely used so far. [0003] Among them, the prestressed concrete structure uses high-strength steel bars or steel wires or fiber materials as the main tensile reinforcement and provides prestressing for the structure, which can effectively improve the structural properties such as stiffness and crack resistance of the structure. The field has been widely used, such as the application of nuclear reactor safety shields, etc., which have obvious technical, economic and social benefits, and have become a symbol of high...

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Problems solved by technology

[0006] However, the cold-rolled twisted reinforced concrete of the prior art still has the following deficiencies in practical application: since the cold-rolled twisted steel bars are evenly distributed in the unit area of ​​the floor slab or roof slab, the mutual contact between the cold-rolled twisted steel bars The distance between them is equal, and the cross-section rotation direction of all cold-rolled twisted steel bars is the same. The disadvantage is that the wedge columns formed by each cold-rolled twisted steel bar and concrete do not have strong attraction to each other, and the concrete wedge columns There is no mutual restraint, and no self-contained concrete is formed. Therefore, the bonding strength and structural rigidity of the reinforced concrete flexural members of the prior art are still insufficient, and its maximum crack width is difficult to control within the range allowed by the state. Its floor slab or The problem of cracks in roof panels and other panels is still not well resolved

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