Overturning and lifting method for major-diameter superheavy end socket

Abstract

The invention discloses an overturning and lifting method for a major-diameter superheavy end socket. The overturning and lifting method comprises the following steps: first, two main lifting lugs and at least one tail slipping lifting lug are arranged on the outer wall of the end socket correspondingly; a main hoist is connected with the main lifting lugs respectively through a main rigging mechanism, and an auxiliary hoist is connected with the tail slipping lifting lugs respectively through an auxiliary rigging mechanism; the main hoist and the auxiliary hoist are started to lift the end socket at the same time, the auxiliary hoist stops operating after the end socket leaves the ground by a certain distance, and the main hoist continues to lift the end socket; the end socket rotates autonomously around the main lifting lugs under the action of the self weight, the auxiliary hoist decreases a load gradually, and the main hoist stops operating and enables the auxiliary rigging mechanism to be operated from the tail slipping lifting lugs when the load of the auxiliary hoist is zero; the end socket is rotated 180 degrees and then connected with the tail slipping lifting lugs again, and the auxiliary hoist operates to enable the end socket to be overturned to a horizontal state, namely overturning operation is completed. The overturning and lifting method enables the major-diameter superheavy end socket to overturn in a self-balancing mode with unequal moments under the action of the gravity of the major-diameter superheavy end socket, the overturning process is smooth and safe, and the quality perfectness ratio is 100% after the overturning process.

Description

technical field [0001] The invention relates to the technical field of hoisting, in particular to the technical field of overturning and hoisting of a large-diameter overweight head; specifically, a method for overturning and hoisting of a large-diameter overweight head with a self-balancing overturning process that is stable and safe. Background technique [0002] During the installation process of large-scale equipment, in order to meet the construction process requirements such as assembly and lining, the head of large-scale equipment needs to be turned over 180° for many times, and the maximum turning weight can reach more than 200 tons. At present, there are mainly two methods for the overturning operation of large-diameter and super-heavy heads in China. One is to set two sets of plate-hole lifting lugs symmetrically on the outer surface of the head. The inside of the head is welded with steel pipes to form a rice-shaped support for reinforcement. Two cranes are used ...

AI Technical Summary

Problems solved by technology

One is to arrange two sets of plate-hole lifting lugs symmetrically on the outer surface of the head. The inside of the head is welded with steel pipes to form a rice-shaped support for reinforcement. Two cranes are used to complete the turning operation. The disadvantage is that the local stress at the lifting lugs and the overall The deflection is large, which has a great impact on the quality of the equipment body and internal lining; the second is to set a set of tube shaft lifting lugs symmetrically above the center of gravity of the head, and a set of plate lifting lugs in the vertical direction, and the inside of the head is welded with steel pipes Reinforced with a rice-shaped support, two cranes are used to complete the overturning operation. The disadvantage is that the overturning process can easily cause the center of gravity of the head to shift, causing the overturned object to overturn suddenly, resulting in impact loads, overloading the rigging and even causing accidents

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