A Pre-tensioned Prestressed Reinforced Concrete Prefabricated Beam

Abstract

The invention discloses a prestressed reinforced concrete precast beam based on a pre-tensioning method. The prestressed reinforced concrete precast beam based on the pre-tensioning method is characterized in that a beam body is of an inverted T-shaped structure consisting of a horizontal rectangular compression resistant part and a vertical rectangular shearing resistant part; the vertical rectangular shearing resistant part is provided with hoopings, and the and hooping parts extend out of the upper surface of the shearing resistant part; at least one side wall of a web of the beam body is vertically provided with a plurality of mold supporting holes; and steel strands are vertically embedded in concrete of the compression resistant part. Because the width of a compressed area at the lower part of the beam is increased, compression resistant effective cross sections are enlarged; and the concrete of the compressed part is additionally matched with horizontal hoopings for restraining concrete from cracking vertically, so that the compression resistant capability at the lower part of the beam is improved, and the stretchability is improved.

Description

technical field [0001] The invention relates to a building prefabricated component beam, in particular to a pretensioned prestressed prefabricated concrete beam used for composite beams. Background technique [0002] The traditional pretensioned prestressed beam usually adopts a rectangular cross-section. When the beam is under a large force, the number of prestressed tendons in the lower part of the beam is limited by the width of the beam. When the stress tendon is stretched, the reverse arch is large. In addition, the role of the rectangular beam concrete material has not been fully utilized, resulting in heavy weight and high transportation costs. Sometimes a large-tonnage tower crane is required for hoisting in place, which increases construction costs. As a prestressed member, when the steel strand is stretched and the continuous beam is under the action of negative bending moment, the lower part of the beam has a greater pressure. The rectangular beam has less transv...

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Problems solved by technology

[0002] The traditional pretensioned prestressed beam usually adopts a rectangular cross-section. When the beam is under a large force, the number of prestressed tendons in the lower part of the beam is limited by the width of the beam. When the stress tendon is stretched, the reverse arch is large

In addition, the role of the rectangular beam concrete material has not been fully utilized, resulting in heavy weight and high transportation costs. Sometimes a large-tonnage tower crane is required for hoisting in place, which increases construction costs

As a prestressed member, when the steel strand is stretched and the continuous beam is under the action of negative bending moment, the lower part of the beam has a greater pressure. The rectangular beam has less transverse restraint reinforcement for the lower part to resist the longitudinal crack, so the compressive capacity is poor, and often Brittle failure, unfavorable for earthquake resistance

A light-weight pre-tensioned prestressed prefabricated beam with restraint stirrups buried in the compression zone has not been reported

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