A method for hoisting the steel containment bottom head of a nuclear power plant and its special sling

Abstract

The invention discloses a method for hoisting a steel safe bottom seal head at nuclear power station and a special-purpose sling tool thereof. The method comprises the following steps: using Ansys software for analyzing and calculating the force when the bottom seal head is hoisted, designing a hanger distribution position and a hoisting scheme, designing and making the special-purpose sling tool; performing a loading test by a crane; performing the loading test by the special-purpose sling tool; performing a simulation test with an empty hook; testing the hoisting; hoisting in a formal mode, reinforcing and installing. The special-purpose sling tool comprises a suspension cable distributor, a release fastener, a secondary distributor, a compacting wire rope and an adjustable pull bar in order from up to down. The hoisting method does not require a specially-manufactured hoisting beam, inner force generated during a hoisting resisting process by self rigidity of the steel safe bottom seal head can be fully used, the circle suspension cable distributor and the adjustable pull bar can ensure uniform bearing of each hoisting point, deformation during the hoisting process is reduced to minimum, and hoisting requirement of the large-scale equipment in a nuclear power station can be accorded. The suspension cable has the advantages of reasonable design, simple structure and convenient connection.

Description

Technical field [0001] The invention belongs to the technical field of construction, and particularly relates to a method for hoisting the bottom head of a steel containment vessel of a nuclear power station and a special sling. Background technique [0002] The steel containment of nuclear power plant is one of the most important key equipment of nuclear island, which contains reactor, steam generator and other main process system equipment. The steel containment is a cylindrical container consisting of a cylindrical cylinder in the middle and two upper and lower elliptical heads (called "top head" and "bottom head" respectively). The steel containment bottom head has the characteristics of overweight, large volume and relatively thin wall thickness relative to the radius. Therefore, it is very difficult to hoist the steel containment as a whole, and it is necessary to design a scientific and reasonable hoisting plan And a special spreader to prevent uneven force or too large d...

AI Technical Summary

Problems solved by technology

The steel containment bottom head has the characteristics of overweight, large volume, and relatively thin wall thickness relative to the radius. Therefore, it is very difficult to lift the steel containment as a whole, and a scientific and reasonable lifting plan is required. and special slings to prevent uneven force or excessive deformation during the hoisting process of the bottom head, which will affect the normal hoisting process

Patent CN201010169251 proposes a special hoisting tool and hoisting method for the steel containment of nuclear power plants. In order to reduce the horizontal stress and elastic displacement of the containment, a hanging beam is designed to ensure that the containment is subjected to vertical loads as much as possible during hoisting. However, the structure of the suspension beam is complex, the manufacturing cost is high, and the connection with the sling is cumbersome

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