Method for repairing top cover of large-diameter water taking head

Abstract

The invention discloses a method for repairing a top cover of a large-diameter water taking head. The method comprises the following steps: prefabricating an externally-wrapped steel frame and a water inlet steel grating. Concrete is poured at the original foundation position of the underwater water taking head, a lower foundation of the newly-manufactured top cover is formed, and connecting bolts are pre-buried in the lower foundation. The prefabricated steel frame is transported to the position above the lower foundation in a hoisting mode, and the steel frame is connected with the lower foundation through pre-buried connecting bolts. After the steel frame is installed, the frame part, below the water inlet window, on the steel frame is poured in an underwater concrete pouring mode, and the steel frame and the lower foundation form a whole. The prefabricated steel grating is installed on the top of the steel frame, and then the top cover of the water taking head is repaired. The method can be suitable for repairing the top cover of the water taking head under various conditions, including fresh water and seawater conditions, can also be suitable for water taking heads with various shapes, can meet the service life after repairing, and has relatively low construction cost and higher construction speed.

Description

technical field [0001] The invention belongs to the technical field of repairing hydraulic structures, and in particular relates to a method for repairing the top cover of a large-diameter water intake head. Background technique [0002] At present, water intake heads are widely used in various thermal power plants and water supply and drainage facilities. The water intake head generally refers to the water intake structure of the surface water intake project, including the inflow device, the water intake pipe, the supporting structure, and the necessary enclosures, guides and other auxiliary facilities. The water intake head is the water intake structure of the surface water intake system, which is the most important part of the entire water intake system. [0003] Due to the existence of wind waves, tides and undercurrents, when the water intake head is impacted by the current in the ocean, the direction is changeable and the impact force is huge. In addition, the metal ...

AI Technical Summary

Problems solved by technology

The water intake head is a hollow structure. For the top cover of the large diameter water intake head, as the span increases, its stiffness is greatly reduced. At the same time, there is a water inlet window on the upper part of the water intake head, resulting in limited strength of the connection node between the top cover and the side wall.

Under the long-term effects of water flow, corrosion, biological influence, etc., the joints between the top cover and the side wall of the large-diameter water intake head are prone to fatigue damage, causing the top cover to fall off, causing debris in the water to enter the water intake and diversion pipe, and deteriorating the water quality. , and even block the water diversion pipes, seriously affecting the safety of water intake

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