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A Pre-tensioned Prestressed Reinforced Concrete Prefabricated Beam

A technology of prestressed steel bars and prestressed steel strands, which is applied in the field of pretensioned prestressed prefabricated concrete beams, can solve the problems that the effect is not fully exerted, the anti-arching of prestressed tendons is large, and the construction cost is increased, so as to reduce scaffolding Cost, increased beam width, and reduced structural cost

Active Publication Date: 2016-10-05
杨众 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • A Pre-tensioned Prestressed Reinforced Concrete Prefabricated Beam
  • A Pre-tensioned Prestressed Reinforced Concrete Prefabricated Beam
  • A Pre-tensioned Prestressed Reinforced Concrete Prefabricated Beam

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Embodiment Construction

[0022] see Figure 1 to Figure 5 , in the embodiment of a pre-tensioned prestressed reinforced concrete prefabricated beam given in the present invention, the beam body is an inverted T-shaped structure composed of a horizontal rectangular compression part 1 and a vertical rectangular shear part 2, and the vertical The rectangular shear part 2 is provided with a stirrup 21, and the part of the stirrup 21 protrudes from the upper surface of the shear part 2, and the horizontal rectangular compression part is also provided with a stirrup 12, and the steel strand 4 is longitudinally Embedded in the concrete of the compression part 1 . The beam body in the present invention is designed as a structure composed of the compression part 1 and the shear part 2. This structure can well solve the problem that the concrete compression resistance and the shear resistance do not match in the existing beam body, so that the beam body The structure is more reasonable and the mechanical perfo...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E04C3/26E04C5/08
Inventor 杨峰
Owner 杨众
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