Large-span prestressed multi-joint truss steel bar laminated plate and construction method

Abstract

The invention relates to a large-span pre-stressed multi-joint truss steel bar laminated plate and a construction method thereof. The large-span pre-stressed multi-joint truss steel bar laminated plate comprises the following steps (1) standard patterning the prefabricated bottom plates of the truss steel bars, and selecting an appropriate module size for factory production; (2) splicing the prefabricated bottom plates of the truss steel bars; (3) arranging additional reinforcing steel bars above the dense splicing joint; (4) reserving a hole at the perforation position of the pre-stressed tendons of the dense splicing plate; (5) cast-in-situ laminated plate concrete; (6) penetrating external pre-stressed tendons, the peripheral supporting beams are tensioned and anchored, and the pre-stressed tendons are uniformly distributed according to the design. According to the invention, an external pre-stress technology is to be adopted, and the external pre-stress technology can be applied during field installation, so that the production process and the structure of a common truss laminated plate are similar to those of a common truss laminated plate during the production of parts in a factory; and during field assembly and installation, the laminated plate is restrained through the application of the external pre-stress. The large-span pre-stressed multi-joint truss steel bar laminated plate and the construction method thereof realizes the effective connection with the peripheral supporting beam, prevents the bonding, sliding of the steel bars and breaking of the concrete at thesplicing position, and realizes the design and construction integration.

Description

technical field [0001] The invention belongs to the technical field of civil engineering, and in particular relates to a large-span prestressed multi-joint truss laminated slab and a construction method. Background technique [0002] According to the "Notice of Green Building Action Plan" (issued by the state in January 2013), "Guiding Opinions on Vigorously Developing Prefabricated Buildings" (officially issued by the State Council in September 2016), "13th Five-Year Plan" Prefabricated Building Action Plan "(issued by the Ministry of Housing and Urban-Rural Development), prefabricated buildings have become the development direction of the industrialization of the construction industry, and the establishment of a standard system to promote the design, construction, and production of parts of the building industrialization, promote the standardization of structural parts, parts, and components, and enrich the standard parts. It has become an urgent task for the development o...

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Problems solved by technology

[0003] The laminated slab is an important structural component in the prefabricated structure. It combines prefabrication and cast-in-place technology, and pours a layer of cast-in-place concrete on the prefabricated prefabricated floor, thus making a prefabricated and cast-in-place composite. Composite slabs and truss reinforced prefabricated slabs are the most popular prefabricated slabs in China at present, and prefabricated slabs with outstretched steel bars are mainly used. However, prefabricated slabs with outstretched steel bars are not suitable for on-site concrete pouring during component production and construction site installation. Problems such as the need for formwork support, large amount of wet work, and inability to guarantee quality

And the one-way and two-way laminated panels with large spans are not suitable for mass prefabrication in the factory due to the limitation of their size in transportation and the demand for factory modular production. The plywood is divided into several plates, and through the connection of the joints, the plates are spliced ​​into one-way and two-way laminated plates with large spans that meet the needs of the project.

However, due to the existence of joints, the concrete is discontinuous, and the crack resistance of concrete cannot be exerted, which leads to earlier cracking of components and structures, and the stress on the concrete at the joints is relatively concentrated. If the concrete is not well restrained, it is easy to cause concrete cracking. Premature crushing, thus affecting the bearing capacity and deformation capacity of the board

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