Steel-support non-cohesive steel strand lower support type prestress floor reinforcing method

Abstract

The invention discloses a steel-support non-cohesive steel strand lower support type prestress floor reinforcing method. The method includes: two or one steel support is disposed at the one-third-span position or half-span position of the bottom of a floor to change the single-span floor into a three-span floor or a two-span floor; certain-distance three-folding-line-shaped or two-folding-line-shaped non-cohesive steel strands are disposed at the bottom of each steel support to serve as the support points of the steel support; two ends of the non-cohesive steel strands are fixed on floor beams or ring beams through steel base plates and anchoring tools; after the non-cohesive steel strands apply prestress, upward counterforce is generated at each steel support to balance off part of floor load so as to achieve the reinforcing effect. The method has the advantages that the steel supports can be made of small I-shaped steel, and brackets at two ends of the steel supports are not needed; the method is an active reinforcing method, the stress of the reinforcing steel bars in the floor becomes small with the application of the prestress, the original cracks of the floor can be reduced and effective controlled, and floor deflection is reduced.

Description

technical field [0001] The invention relates to the field of construction engineering reinforcement, in particular to a method for reinforcing floor slabs with steel supports supporting non-bonding steel strands under the bracing prestressed type. Background technique [0002] In a building, the floor is one of the most basic components. It has a large quantity and a wide area, and is the first pass to bear the external load. The bearing capacity of the floor directly affects the normal use of the building. On the one hand, in the reconstruction and reinforcement of buildings, since the object of reinforcement is the completed building structure, the structure must be in a stressed state before reinforcement, and the initial stress or The initial deformation, the level of the initial stress of the structural member or the extent of the initial deformation will directly affect the reinforcement effect of the structure. [0003] The existing reinforcement technology for the b...

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Problems solved by technology

However, its reinforcement effect is not obvious. The high strength of carbon fiber cloth does not match the very low tensile strength of concrete. When the concrete cracks, the strength of carbon fiber cloth only exerts less than 3%. The strength of carbon fiber cloth is only exerted less than 20%

Therefore, the use of carbon fiber cloth reinforcement is a great waste of resources; if the reinforcement design is carried out according to the design strength of carbon fiber cloth, it will leave serious hidden dangers to the structural safety; and the service life after reinforcement is not synchronized with the original structure, and repeated reinforcement is required Construction, resulting in a waste of manpower and material resources; carbon fiber reinforcement can not increase the stiffness of the floor

Another reinforcement method is to set a steel beam with a higher section stiffness at the bottom of the slab, which requires the installation of corbels, which not only increases the load on the floor slab, but also has a poor reinforcement effect.

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