Fixing method for repairing old concrete gravity dam with cracks through FRP

Abstract

The invention belongs to the field of structure engineering, material engineering and hydraulic and hydro-power engineering, and provides a fixing method for repairing an old concrete gravity dam with cracks through FRP. According to the method, the characteristics of low weight, high strength and corrosion resistance of FRP pieces are fully considered, an epoxy resin structure mixed with coupling reagents guarantees reliable bonding of the FRP pieces and the concrete gravity dam, and force is transmitted together. The grinding mode is used for embedding the FRP pieces with ribs to a non-congealed cement mortar face layer for repairing, and the FRP pieces and the non-congealed cement mortar face layer are tightly bonded and mechanically meshed. Rivets are used for mechanically anchoring the edges of the FRP pieces which is prone to stripping damage, the FRP pieces can not be easily stripped or subjected to brittle failure, and further expanding of the cracks is restrained. The method is simple and can be conveniently applied to engineering, the method can be used as an effective way for bonding, fixing and repairing the old concrete gravity dam with the cracks through the FRP pieces, design and construction for reinforcing the old concrete gravity dam through the FRP pieces can be guided, the expected protection requirement can be met through the design, and unnecessary economic waste is avoided.

Description

technical field [0001] The invention relates to a pasting and fixing method for repairing cracked old concrete gravity dam bodies with FRP sheets, which relates to the fields of structural engineering, material engineering and water conservancy and hydropower engineering. Background technique [0002] Some concrete gravity dams built in the early days of the founding of the People's Republic of China had defects in the design specifications at that time and had been used for a long time. The dam body produced a large number of tensile or shear cracks, which caused hidden dangers to the operation of the dam. Utilizing the performance characteristics of FRP sheets such as light weight, high strength, and corrosion resistance, they are bonded to the surface of cracks in old concrete gravity dams through technical means such as epoxy resin structural adhesives, which can effectively inhibit the expansion of cracks, thereby ensuring reliable maintenance of the dam. repair and rei...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for pasting and fixing the old concrete gravity dam with cracks that is effectively used for repairing the old concrete gravity dam body with the FRP sheet, so as to overcome the fact that the FRP sheet is prone to peeling damage when reinforcing the concrete structure with cracks The phenomenon

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