Pre-tensioned prestressed reinforced concrete precast beam

Abstract

The invention relates to a pre-tensioned prestressed reinforced concrete precast beam which comprises a beam body and prestressed steel strands which are buried in the beam body and serve as main bars, wherein the beam body is provided with stirrups, the stirrup parts extend out of the upper surface of the beam body, at least one end part of the beam body is provided with section steel which is suitable for being connected with an external structure, the section steel part is buried in the beam body, the other parts are exposed at the end part of the beam body, and a plurality of support formwork holes are arranged on at least one side wall of the beam body along the longitudinal direction. The section steel is arranged at the end part of the precast beam, thereby being conductive to mounting of the precast beam; the section steel can also serve as a member for combining new concrete with old concrete or a mounting shelving member of a column or a beam; and simultaneously, the support formwork holes are arranged on the beam body, and the support formwork holes can enable the beam to be used as a load-bearing member during the construction stage for bearing the dead weight of the concrete, thereby omitting a landing load-bearing frame.

Description

technical field [0001] The invention relates to a prefabricated beam, in particular to a reinforced concrete prefabricated beam used in buildings and prestressed by a pretensioning method. Background technique [0002] The prefabricated composite beams in the prior art mainly include steel-concrete composite beams and reinforced concrete composite beams. The prefabricated beams can be mass-produced, which can effectively reduce costs and improve construction efficiency. However, most of the existing prefabricated beams are connected by the tooth-alveolar structure at the end and non-prestressed steel bars, the bonding performance of old and new concrete is poor, and the shear strength of the normal section is low. In terms of installation, the steel bars in this prefabricated beam are difficult to bend and cannot be installed in many occasions. Moreover, the poor anchoring performance limits the popularization and application of the prefabricated cast-in-place system. In a...

AI Technical Summary

Problems solved by technology

However, in this scheme, ordinary steel bars are used as the main reinforcement, and the welding workload is complicated, and the connection node structure is complex, and it is a non-superimposed beam, and the total height of the beam is large.

The manufacturing cost is high, the construction process is many, and the progress is slow, so it is difficult to reflect the advantages of fast construction and low cost of factory buildings

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