Method for hoisting heavy large covers for towers

Abstract

The invention discloses a method for hoisting heavy large covers for towers by the aid of lifting rings. The method includes steps of detaching nuts; manufacturing 4 U-shaped gaskets I from steel plates with the sizes of 12 mm and manufacturing 56 U-shaped gaskets II from stainless steel plates with the thicknesses of 1mm; jacking the large covers by the aid of jackscrews; dividing the gaskets I and II into four groups; firmly bundling non-U-shaped groove ends of the corresponding gaskets I and II to form a first gasket group, a second gasket group, a third gasket group and a fourth gasket group; placing the first gasket group, the second gasket group, the third gasket group and the fourth gasket group in gaps between each large cover and a barrel; detaching connecting bolts near damaged cotter lifting rings and exposing bolt holes; symmetrically hanging two hand pulling blocks on two undamaged cotter lifting rings; allowing two ends of perforation binding steel wire rope to penetrateeach bolt hole and fastening every two corresponding tip noses with each other; folding and hanging steel wire ropes on the perforation binding steel wire ropes; hanging the hand pulling blocks and the steel wire ropes on lifting hooks and lifting the large covers; placing the large covers on ground sleepers; completely carrying out maintenance and reassembling the large covers. The method has theadvantages that the method is easy to operate and free of risks, and is safe and reliable, smooth maintenance work can be guaranteed, and influence on maintenance construction periods can be prevented.

Description

technical field [0001] The invention relates to the field of dismantling and installation of an ammonia synthesis tower, more specifically, it relates to a method for hoisting a heavy-duty tower cover when the peg suspension ring installed on the large cover (cover head) is damaged. Background technique [0002] For ammonia synthesis towers with high temperature, high pressure and special media, the large cover is an important component of the synthesis tower. During the installation or maintenance of the synthesis tower, the removal and installation of the large cover is an indispensable step. The big cover of the synthesis tower is very heavy, the light one is about 20 tons, and the heavy one is about 40 tons. The hoisting of the large cover depends on the four stud rings installed on the top. If the synthetic tower is used for a long time, it is easy to cause corrosion and damage to the stud rings. Once the stud rings are damaged, the hoisting of the large cover will beco...

AI Technical Summary

Problems solved by technology

The hoisting of the large cover depends on the four stud rings installed on the top. If the synthetic tower is used for a long time, it is easy to cause corrosion and damage to the stud rings. Once the stud rings are damaged, the hoisting of the large cover will become a problem

[0003] The traditional hoisting method usually uses 4 stud rings to lift. If the stud rings are damaged, they must be re-customized, and the cycle of re-customizing the stud rings is long, usually about 15-30 days, which seriously affects the synthetic tower. maintenance work

Images