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

A fixing method and concrete technology, applied in water conservancy projects, marine engineering, construction, etc., can solve problems such as peeling and damage, and achieve the effects of improving work performance, optimizing bonding measures, optimizing bonding measures and material properties

Inactive Publication Date: 2014-08-13
凌贤长
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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

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Embodiment Construction

[0010] The method for pasting and fixing the old concrete gravity dam body with cracks to be repaired by FRP sheets will be described in detail below in conjunction with the accompanying drawings.

[0011] (1) Grind the concrete surface at the gate pier of the old concrete gravity dam with cracks, clean the severely carbonized concrete, clean the surface with water, and wipe the polished part with acetone, which can improve the bond strength; through the grouting process After filling the cracks with epoxy resin, cover the surface with high-grade cement mortar, trim and level it, and reinforce the dam; before the cement mortar is completely set and hardened, place the ribbed FRP sheet coated with curing agent structural adhesive vertically on the The cracks are glued to the unhardened cement mortar surface, using such as figure 1 The rolling device shown is rolling while vibrating, so that the ribbed FRP sheet and the cement mortar layer are firmly bonded together. The ribs of...

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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...

Claims

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Application Information

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IPC IPC(8): E02B3/16
Inventor 唐亮凌贤长田爽于程一咸贵军
Owner 凌贤长
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