English：

Due to the irregular shape of the attachment pipe on the top of the large vertical tower, the main hanging lug is usually multi?point. During hoisting, the auxiliary machinery and hangers are used to turn over and adjust the corresponding port. The construction cost is high, the efficiency is low and the safety risk is large. It is necessary to study new hoisting technology. The attachment pipe on the top of the quenching oil column in a large petrochemical project has the characteristics of large diameter and large quality. The single hanging lug hoisting technology is designed, the single point main hanging lug and the single point tailing lug are used for hoisting. It enables the longitudinal axis of the attachment pipe to be in a natural horizontal state after hoisting, and the straight pipe section to be in a natural vertical state after erecting, so as to complete the hoisting operation safely and efficiently.