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Post-tensioning retard-bonded co-tensioning prestress concrete composite beam and design and construction methods thereof

A slow-bonded prestressed concrete technology, applied in the direction of joists, girders, trusses, etc.

Active Publication Date: 2019-06-11
上海同吉建筑工程设计有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the pretensioning construction technology can ensure the effective bonding force between the prestressed tendons and the concrete, and the construction is simple, but it is only suitable for the industrial production of small and medium components.

Method used

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  • Post-tensioning retard-bonded co-tensioning prestress concrete composite beam and design and construction methods thereof
  • Post-tensioning retard-bonded co-tensioning prestress concrete composite beam and design and construction methods thereof
  • Post-tensioning retard-bonded co-tensioning prestress concrete composite beam and design and construction methods thereof

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Embodiment Construction

[0072] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0073] see Figure 1-Figure 4 Shown is a co-tensioned prestressed concrete composite beam with post-tensioning and slow bonding. A layer of top longitudinal reinforcement 1 is provided on the top of the composite beam, a layer of bottom longitudinal reinforcement 6 is provided at the bottom of the composite beam, and a composite layer 2 is provided on the top of the composite beam, as figure 1 As shown, the upper part of the dotted line is the composite layer 2, and the lower part of the dotted line is the concrete prefabricated component. Two layers of tie bars 8 are arranged in the middle of the composite beam, waist bars 3 are arranged at the lower end of each layer of tie bars 8, and several pre-tensioned prestressed bars are arranged at the bottom of the composite beam. Rib 5, a number of slow-bonded prestressed tendons 4 are arranged at the bottom of ...

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Abstract

The invention relates to a post-tensioning retard-bonded co-tensioning prestress concrete composite beam and design and construction methods thereof. The post-tensioning retard-bonded co-tensioning prestress concrete composite beam is a novel prestressed composite beam for applying bonded prestress and retard-bonded prestress to a precast beam and the composite beam through pre-tensioning method and post-tensioning method processes in stages in order to meet the construction and use demands. Compared with a traditional prestress composite beam, the post-tensioning retard-bonded prestress technology is adopted in the post-tensioning retard-bonded co-tensioning prestress concrete composite beam, the characteristics of high prefabrication degree, convenient and fast construction and the likeof a lower composite structure are achieved, and the anti-crack and anti-bending properties of a member can be further improved. Configuration of prestressed tendons is relatively more flexible, and the post-tensioning retard-bonded prestress tendons have the good anti-corrosion property, so that the post-tensioning retard-bonded co-tensioning prestress concrete composite beam is especially suitable for structures which have the high-property requirements such as the large span and the heavy load and have the high requirements for deformation control, bearing capacity and the weather-proof property, and the superiority of the fabricated structures can also be embodied while the design requirements are met.

Description

technical field [0001] The invention relates to the technical field of civil engineering design, in particular to a multi-stage tensioned prestressed concrete composite beam and its construction method in a large-span heavy-duty structure that is tensioned after slow bonding. Background technique [0002] In recent years, with the improvement of my country's construction technology, the corresponding construction level has also become higher and higher. There are new concepts and requirements in terms of architectural aesthetics, architectural quality, construction efficiency, and green, low-carbon and energy-saving buildings. However, the labor cost of manpower and the environmental impact control requirements during the construction process will also increase, which will not be a small test for the improvement of the construction level. Building industrialization, because its integrated design and construction production method can meet the above requirements for building...

Claims

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Application Information

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IPC IPC(8): E04C3/26
Inventor 熊学玉肖启晟汪继恕熊斌
Owner 上海同吉建筑工程设计有限公司
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